patch-2.1.16 linux/drivers/scsi/esp.c
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- Lines: 4393
- Date:
Fri Dec 13 11:37:37 1996
- Orig file:
v2.1.15/linux/drivers/scsi/esp.c
- Orig date:
Sun Apr 21 12:42:05 1996
diff -u --recursive --new-file v2.1.15/linux/drivers/scsi/esp.c linux/drivers/scsi/esp.c
@@ -3,6 +3,15 @@
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
+/* TODO:
+ *
+ * 1) Maybe disable parity checking in config register one for SCSI1
+ * targets. (Gilmore says parity error on the SBus can lock up
+ * old sun4c's)
+ * 2) Add support for DMA2 pipelining.
+ * 3) Add tagged queueing.
+ */
+
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/types.h>
@@ -19,39 +28,135 @@
#include <asm/sbus.h>
#include <asm/dma.h>
#include <asm/system.h>
-#include <asm/idprom.h>
#include <asm/machines.h>
#include <asm/ptrace.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/vaddrs.h>
#include <asm/io.h>
+#include <asm/idprom.h>
#define DEBUG_ESP
+/* #define DEBUG_ESP_HME */
+/* #define DEBUG_ESP_DATA */
+/* #define DEBUG_ESP_QUEUE */
+/* #define DEBUG_ESP_DISCONNECT */
+/* #define DEBUG_ESP_STATUS */
+/* #define DEBUG_ESP_PHASES */
+/* #define DEBUG_ESP_WORKBUS */
+/* #define DEBUG_STATE_MACHINE */
+/* #define DEBUG_ESP_CMDS */
+/* #define DEBUG_ESP_IRQS */
+/* #define DEBUG_SDTR */
/* #define DEBUG_ESP_SG */
+/* Use the following to sprinkle debugging messages in a way which
+ * suits you if combinations of the above become too verbose when
+ * trying to track down a specific problem.
+ */
+/* #define DEBUG_ESP_MISC */
+
#if defined(DEBUG_ESP)
#define ESPLOG(foo) printk foo
#else
#define ESPLOG(foo)
#endif /* (DEBUG_ESP) */
-#define INTERNAL_ESP_ERROR \
- (panic ("Internal ESP driver error in file %s, line %d\n", \
- __FILE__, __LINE__))
-
-#define INTERNAL_ESP_ERROR_NOPANIC \
- (printk ("Internal ESP driver error in file %s, line %d\n", \
- __FILE__, __LINE__))
+#if defined(DEBUG_ESP_HME)
+#define ESPHME(foo) printk foo
+#else
+#define ESPHME(foo)
+#endif
+
+#if defined(DEBUG_ESP_DATA)
+#define ESPDATA(foo) printk foo
+#else
+#define ESPDATA(foo)
+#endif
+
+#if defined(DEBUG_ESP_QUEUE)
+#define ESPQUEUE(foo) printk foo
+#else
+#define ESPQUEUE(foo)
+#endif
+
+#if defined(DEBUG_ESP_DISCONNECT)
+#define ESPDISC(foo) printk foo
+#else
+#define ESPDISC(foo)
+#endif
+
+#if defined(DEBUG_ESP_STATUS)
+#define ESPSTAT(foo) printk foo
+#else
+#define ESPSTAT(foo)
+#endif
+
+#if defined(DEBUG_ESP_PHASES)
+#define ESPPHASE(foo) printk foo
+#else
+#define ESPPHASE(foo)
+#endif
+
+#if defined(DEBUG_ESP_WORKBUS)
+#define ESPBUS(foo) printk foo
+#else
+#define ESPBUS(foo)
+#endif
+
+#if defined(DEBUG_ESP_IRQS)
+#define ESPIRQ(foo) printk foo
+#else
+#define ESPIRQ(foo)
+#endif
+
+#if defined(DEBUG_SDTR)
+#define ESPSDTR(foo) printk foo
+#else
+#define ESPSDTR(foo)
+#endif
+
+#if defined(DEBUG_ESP_MISC)
+#define ESPMISC(foo) printk foo
+#else
+#define ESPMISC(foo)
+#endif
-/* This enum will be expanded when we have sync code written. */
+/* Command phase enumeration. */
enum {
- not_issued = 0x01, /* Still in the issue_SC queue. */
- in_selection = 0x02, /* ESP is arbitrating, awaiting IRQ */
- in_datain = 0x04, /* Data is transferring over the bus */
- in_dataout = 0x08, /* Data is transferring over the bus */
- in_status = 0x10, /* Awaiting status/msg bytes from target */
- in_finale = 0x11, /* Sent Msg ack, awaiting disconnect */
+ not_issued = 0x00, /* Still in the issue_SC queue. */
+
+ /* Various forms of selecting a target. */
+#define in_slct_mask 0x10
+ in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */
+ in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */
+ in_slct_msg = 0x12, /* select, then send a message */
+ in_slct_tag = 0x13, /* select and send tagged queue msg */
+ in_slct_sneg = 0x14, /* select and acquire sync capabilities */
+
+ /* Any post selection activity. */
+#define in_phases_mask 0x20
+ in_datain = 0x20, /* Data is transferring from the bus */
+ in_dataout = 0x21, /* Data is transferring to the bus */
+ in_data_done = 0x22, /* Last DMA data operation done (maybe) */
+ in_msgin = 0x23, /* Eating message from target */
+ in_msgincont = 0x24, /* Eating more msg bytes from target */
+ in_msgindone = 0x25, /* Decide what to do with what we got */
+ in_msgout = 0x26, /* Sending message to target */
+ in_msgoutdone = 0x27, /* Done sending msg out */
+ in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */
+ in_cmdend = 0x29, /* Done sending slow cmd */
+ in_status = 0x2a, /* Was in status phase, finishing cmd */
+ in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */
+ in_the_dark = 0x2c, /* Don't know what bus phase we are in */
+
+ /* Special states, ie. not normal bus transitions... */
+#define in_spec_mask 0x80
+ in_abortone = 0x80, /* Aborting one command currently */
+ in_abortall = 0x81, /* Blowing away all commands we have */
+ in_resetdev = 0x82, /* SCSI target reset in progress */
+ in_resetbus = 0x83, /* SCSI bus reset in progress */
+ in_tgterror = 0x84, /* Target did something stupid */
};
struct proc_dir_entry proc_scsi_esp = {
@@ -59,8 +164,11 @@
S_IFDIR | S_IRUGO | S_IXUGO, 2
};
-struct Sparc_ESP *espchain;
+/* The master ring of all esp hosts we are managing in this driver. */
+static struct Sparc_ESP *espchain;
+static int esps_running = 0;
+/* Forward declarations. */
static void esp_intr(int irq, void *dev_id, struct pt_regs *pregs);
static void esp_done(struct Sparc_ESP *esp, int error);
@@ -181,10 +289,102 @@
(stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" :
(stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" :
(stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" :
- (stepreg == ESP_STEP_FINI ? "CMD_SENT_OK" :
+ (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" :
"UNKNOWN"))))));
}
+static char *phase_string(int phase)
+{
+ switch(phase) {
+ case not_issued:
+ return "UNISSUED";
+ case in_slct_norm:
+ return "SLCTNORM";
+ case in_slct_stop:
+ return "SLCTSTOP";
+ case in_slct_msg:
+ return "SLCTMSG";
+ case in_slct_tag:
+ return "SLCTTAG";
+ case in_slct_sneg:
+ return "SLCTSNEG";
+ case in_datain:
+ return "DATAIN";
+ case in_dataout:
+ return "DATAOUT";
+ case in_data_done:
+ return "DATADONE";
+ case in_msgin:
+ return "MSGIN";
+ case in_msgincont:
+ return "MSGINCONT";
+ case in_msgindone:
+ return "MSGINDONE";
+ case in_msgout:
+ return "MSGOUT";
+ case in_msgoutdone:
+ return "MSGOUTDONE";
+ case in_cmdbegin:
+ return "CMDBEGIN";
+ case in_cmdend:
+ return "CMDEND";
+ case in_status:
+ return "STATUS";
+ case in_freeing:
+ return "FREEING";
+ case in_the_dark:
+ return "CLUELESS";
+ case in_abortone:
+ return "ABORTONE";
+ case in_abortall:
+ return "ABORTALL";
+ case in_resetdev:
+ return "RESETDEV";
+ case in_resetbus:
+ return "RESETBUS";
+ case in_tgterror:
+ return "TGTERROR";
+ default:
+ return "UNKNOWN";
+ };
+}
+
+static inline void esp_advance_phase(Scsi_Cmnd *s, int newphase)
+{
+#ifdef DEBUG_STATE_MACHINE
+ ESPLOG(("<%s>", phase_string(newphase)));
+#endif
+ s->SCp.sent_command = s->SCp.phase;
+ s->SCp.phase = newphase;
+}
+
+extern inline void esp_cmd(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ unchar cmd)
+{
+#ifdef DEBUG_ESP_CMDS
+ esp->espcmdlog[esp->espcmdent] = cmd;
+ esp->espcmdent = (esp->espcmdent + 1) & 31;
+#endif
+ eregs->esp_cmd = cmd;
+}
+
+/* How we use the various Linux SCSI data structures for operation.
+ *
+ * struct scsi_cmnd:
+ *
+ * We keep track of the syncronous capabilities of a target
+ * in the device member, using sync_min_period and
+ * sync_max_offset. These are the values we directly write
+ * into the ESP registers while running a command. If offset
+ * is zero the ESP will use asynchronous transfers.
+ * If the borken flag is set we assume we shouldn't even bother
+ * trying to negotiate for synchronous transfer as this target
+ * is really stupid. If we notice the target is dropping the
+ * bus, and we have been allowing it to disconnect, we clear
+ * the disconnect flag.
+ */
+
+
/* Manipulation of the ESP command queues. Thanks to the aha152x driver
* and its author, Juergen E. Fischer, for the methods used here.
* Note that these are per-ESP queues, not global queues like
@@ -207,6 +407,16 @@
restore_flags(flags);
}
+static inline void prepend_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC)
+{
+ unsigned long flags;
+
+ save_flags(flags); cli();
+ new_SC->host_scribble = (unsigned char *) *SC;
+ *SC = new_SC;
+ restore_flags(flags);
+}
+
static inline Scsi_Cmnd *remove_first_SC(Scsi_Cmnd **SC)
{
Scsi_Cmnd *ptr;
@@ -240,58 +450,188 @@
return ptr;
}
-static inline void do_pause(unsigned amount)
-{
- unsigned long the_time = jiffies + amount;
-
- while(jiffies < the_time)
- barrier(); /* Not really needed, but... */
-}
-
-/* This places the ESP into a known state at boot time. */
-static inline void esp_bootup_reset(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs)
+/* Resetting various pieces of the ESP scsi driver chipset/buses. */
+static inline void esp_reset_dma(struct Sparc_ESP *esp)
{
struct sparc_dma_registers *dregs = esp->dregs;
- volatile unchar trash;
+ unsigned long tmp, flags;
+ int can_do_burst16, can_do_burst32;
+
+ can_do_burst16 = esp->bursts & DMA_BURST16;
+ can_do_burst32 = esp->bursts & DMA_BURST32;
/* Punt the DVMA into a known state. */
- dregs->cond_reg |= DMA_RST_SCSI;
- do_pause(100);
- dregs->cond_reg &= ~(DMA_RST_SCSI);
- if(esp->dma->revision == dvmarev2)
+ if(esp->dma->revision != dvmahme) {
+ dregs->cond_reg |= DMA_RST_SCSI;
+ dregs->cond_reg &= ~(DMA_RST_SCSI);
+ }
+ switch(esp->dma->revision) {
+ case dvmahme:
+ /* This is the HME DVMA gate array. */
+
+ save_flags(flags); cli(); /* I really hate this chip. */
+
+ dregs->cond_reg = 0x08000000; /* Reset interface to FAS */
+ dregs->cond_reg = DMA_RST_SCSI; /* Reset DVMA itself */
+
+ tmp = (DMA_PARITY_OFF|DMA_2CLKS|DMA_SCSI_DISAB|DMA_INT_ENAB);
+ tmp &= ~(DMA_ENABLE|DMA_ST_WRITE|DMA_BRST_SZ);
+
+ if(can_do_burst32)
+ tmp |= DMA_BRST32;
+
+ /* This chip is horrible. */
+ while(dregs->cond_reg & DMA_PEND_READ)
+ udelay(1);
+
+ dregs->cond_reg = 0;
+
+ dregs->cond_reg = tmp; /* bite me */
+ restore_flags(flags); /* ugh... */
+ break;
+ case dvmarev2:
+ /* This is the gate array found in the sun4m
+ * NCR SBUS I/O subsystem.
+ */
if(esp->erev != esp100)
dregs->cond_reg |= DMA_3CLKS;
- else if(esp->dma->revision == dvmarev3)
- if(esp->erev == fas236 || esp->erev == fas100a) {
- dregs->cond_reg &= ~(DMA_3CLKS);
- dregs->cond_reg |= DMA_2CLKS;
+ break;
+ case dvmarev3:
+ dregs->cond_reg &= ~(DMA_3CLKS);
+ dregs->cond_reg |= DMA_2CLKS;
+ if(can_do_burst32) {
+ dregs->cond_reg &= ~(DMA_BRST_SZ);
+ dregs->cond_reg |= DMA_BRST32;
}
- else if(esp->dma->revision == dvmaesc1)
+ break;
+ case dvmaesc1:
+ /* This is the DMA unit found on SCSI/Ether cards. */
dregs->cond_reg |= DMA_ADD_ENABLE;
+ dregs->cond_reg &= ~DMA_BCNT_ENAB;
+ if(!can_do_burst32 && can_do_burst16) {
+ dregs->cond_reg |= DMA_ESC_BURST;
+ } else {
+ dregs->cond_reg &= ~(DMA_ESC_BURST);
+ }
+ break;
+ default:
+ break;
+ };
DMA_INTSON(dregs);
+}
+
+/* Reset the ESP chip, _not_ the SCSI bus. */
+static inline void esp_reset_esp(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs)
+{
+ int family_code, version, i;
+ volatile int trash;
/* Now reset the ESP chip */
- eregs->esp_cmd = ESP_CMD_RC;
- eregs->esp_cmd = (ESP_CMD_NULL | ESP_CMD_DMA);
- eregs->esp_cmd = (ESP_CMD_NULL | ESP_CMD_DMA); /* borken hardware... */
+ esp_cmd(esp, eregs, ESP_CMD_RC);
+ esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA);
+ esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA);
/* Reload the configuration registers */
- eregs->esp_cfg1 = esp->config1;
eregs->esp_cfact = esp->cfact;
eregs->esp_stp = 0;
eregs->esp_soff = 0;
- eregs->esp_timeo = esp->sync_defp;
- if(esp->erev == esp100a || esp->erev == esp236)
+ eregs->esp_timeo = esp->neg_defp;
+
+ /* This is the only point at which it is reliable to read
+ * the ID-code for a fast ESP chip variants.
+ */
+ esp->max_period = ((35 * esp->ccycle) / 1000);
+ if(esp->erev == fast) {
+ version = eregs->esp_uid;
+ family_code = (version & 0xf8) >> 3;
+ if(family_code == 0x02)
+ esp->erev = fas236;
+ else if(family_code == 0x0a)
+ esp->erev = fashme; /* Version is usually '5'. */
+ else
+ esp->erev = fas100a;
+ printk("esp%d: FAST chip is %s (family=%d, version=%d)\n",
+ esp->esp_id,
+ (esp->erev == fas236) ? "fas236" :
+ ((esp->erev == fas100a) ? "fas100a" :
+ "fasHME"), family_code, (version & 7));
+
+ esp->min_period = ((4 * esp->ccycle) / 1000);
+ } else {
+ esp->min_period = ((5 * esp->ccycle) / 1000);
+ }
+ esp->max_period = (esp->max_period + 3)>>2;
+ esp->min_period = (esp->min_period + 3)>>2;
+
+ eregs->esp_cfg1 = esp->config1;
+ switch(esp->erev) {
+ case esp100:
+ /* nothing to do */
+ break;
+ case esp100a:
+ eregs->esp_cfg2 = esp->config2;
+ break;
+ case esp236:
+ /* Slow 236 */
+ eregs->esp_cfg2 = esp->config2;
+ eregs->esp_cfg3 = esp->config3[0];
+ break;
+ case fashme:
+ esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB);
+ /* fallthrough... */
+ case fas236:
+ /* Fast 236 or HME */
+ eregs->esp_cfg2 = esp->config2;
+ for(i=0; i<8; i++) {
+ if(esp->erev == fashme)
+ esp->config3[i] |=
+ (ESP_CONFIG3_FCLOCK | ESP_CONFIG3_BIGID | ESP_CONFIG3_OBPUSH);
+ else
+ esp->config3[i] |= ESP_CONFIG3_FCLK;
+ }
+ eregs->esp_cfg3 = esp->config3[0];
+ if(esp->erev == fashme) {
+ esp->radelay = 80;
+ } else {
+ if(esp->diff)
+ esp->radelay = 0;
+ else
+ esp->radelay = 96;
+ }
+ break;
+ case fas100a:
+ /* Fast 100a */
eregs->esp_cfg2 = esp->config2;
- if(esp->erev == esp236)
+ for(i=0; i<8; i++)
+ esp->config3[i] |= ESP_CONFIG3_FCLOCK;
eregs->esp_cfg3 = esp->config3[0];
+ esp->radelay = 32;
+ break;
+ default:
+ panic("esp: what could it be... I wonder...");
+ break;
+ };
+
/* Eat any bitrot in the chip */
trash = eregs->esp_intrpt;
+ udelay(100);
+}
+
+/* This places the ESP into a known state at boot time. */
+static inline void esp_bootup_reset(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs)
+{
+ volatile unchar trash;
+
+ /* Reset the DMA */
+ esp_reset_dma(esp);
+
+ /* Reset the ESP */
+ esp_reset_esp(esp, eregs);
/* Reset the SCSI bus, but tell ESP not to generate an irq */
eregs->esp_cfg1 |= ESP_CONFIG1_SRRDISAB;
- eregs->esp_cmd = ESP_CMD_RS;
- do_pause(200);
+ esp_cmd(esp, eregs, ESP_CMD_RS);
+ udelay(400);
eregs->esp_cfg1 = esp->config1;
/* Eat any bitrot in the chip and we are done... */
@@ -312,34 +652,47 @@
struct Linux_SBus_DMA *dma, *dlink;
unsigned int fmhz;
unchar ccf, bsizes, bsizes_more;
- int nesps = 0;
- int esp_node;
+ int nesps = 0, esps_in_use = 0;
+ int esp_node, i;
espchain = 0;
if(!SBus_chain)
panic("No SBUS in esp_detect()");
for_each_sbus(sbus) {
for_each_sbusdev(sbdev_iter, sbus) {
+ struct linux_sbus_device *espdma = 0;
+ int hme = 0;
+
/* Is it an esp sbus device? */
esp_dev = sbdev_iter;
if(strcmp(esp_dev->prom_name, "esp") &&
strcmp(esp_dev->prom_name, "SUNW,esp")) {
- if(!esp_dev->child ||
- strcmp(esp_dev->prom_name, "espdma"))
- continue; /* nope... */
- esp_dev = esp_dev->child;
- if(strcmp(esp_dev->prom_name, "esp") &&
- strcmp(esp_dev->prom_name, "SUNW,esp"))
- continue; /* how can this happen? */
+ if(!strcmp(esp_dev->prom_name, "SUNW,fas")) {
+ hme = 1;
+ espdma = esp_dev;
+ } else {
+ if(!esp_dev->child ||
+ (strcmp(esp_dev->prom_name, "espdma") &&
+ strcmp(esp_dev->prom_name, "dma")))
+ continue; /* nope... */
+ espdma = esp_dev;
+ esp_dev = esp_dev->child;
+ if(strcmp(esp_dev->prom_name, "esp") &&
+ strcmp(esp_dev->prom_name, "SUNW,esp"))
+ continue; /* how can this happen? */
+ }
}
esp_host = scsi_register(tpnt, sizeof(struct Sparc_ESP));
if(!esp_host)
panic("Cannot register ESP SCSI host");
+ if(hme)
+ esp_host->max_id = 16;
esp = (struct Sparc_ESP *) esp_host->hostdata;
if(!esp)
panic("No esp in hostdata");
esp->ehost = esp_host;
esp->edev = esp_dev;
+ esp->esp_id = nesps++;
/* Put into the chain of esp chips detected */
if(espchain) {
elink = espchain;
@@ -361,19 +714,31 @@
prom_getstring(esp_node, "name", esp->prom_name,
sizeof(esp->prom_name));
esp->prom_node = esp_node;
- for_each_dvma(dlink) {
- if(ESP_IS_MY_DVMA(esp, dlink) && !dlink->allocated)
- break;
+ if(espdma) {
+ for_each_dvma(dlink) {
+ if(dlink->SBus_dev == espdma)
+ break;
+ }
+ } else {
+ for_each_dvma(dlink) {
+ if(ESP_IS_MY_DVMA(esp, dlink) &&
+ !dlink->allocated)
+ break;
+ }
}
#undef ESP_IS_MY_DVMA
- /* If we don't know how to handle the dvma, do not use this device */
+ /* If we don't know how to handle the dvma,
+ * do not use this device.
+ */
if(!dlink){
- printk ("Cannot find dvma for ESP SCSI\n");
+ printk ("Cannot find dvma for ESP%d's SCSI\n",
+ esp->esp_id);
scsi_unregister (esp_host);
continue;
}
if (dlink->allocated){
- printk ("esp: can't use my espdma\n");
+ printk ("esp%d: can't use my espdma\n",
+ esp->esp_id);
scsi_unregister (esp_host);
continue;
}
@@ -383,11 +748,23 @@
esp->dregs = dregs = dma->regs;
/* Map in the ESP registers from I/O space */
- prom_apply_sbus_ranges(esp->edev->reg_addrs, 1);
- esp->eregs = eregs = (struct Sparc_ESP_regs *)
+ if(!hme) {
+ prom_apply_sbus_ranges(esp->edev->my_bus,
+ esp->edev->reg_addrs, 1);
+
+ esp->eregs = eregs = (struct Sparc_ESP_regs *)
sparc_alloc_io(esp->edev->reg_addrs[0].phys_addr, 0,
PAGE_SIZE, "ESP Registers",
esp->edev->reg_addrs[0].which_io, 0x0);
+ } else {
+ /* On HME, two reg sets exist, first is DVMA,
+ * second is ESP registers.
+ */
+ esp->eregs = eregs = (struct Sparc_ESP_regs *)
+ sparc_alloc_io(esp->edev->reg_addrs[1].phys_addr, 0,
+ PAGE_SIZE, "ESP Registers",
+ esp->edev->reg_addrs[1].which_io, 0x0);
+ }
if(!eregs)
panic("ESP registers unmappable");
esp->esp_command =
@@ -400,7 +777,6 @@
esp->ehost->io_port = (unsigned int) esp->eregs;
esp->ehost->n_io_port = (unsigned char)
esp->edev->reg_addrs[0].reg_size;
- /* XXX The following may be different on sun4ms XXX */
esp->ehost->irq = esp->irq = esp->edev->irqs[0].pri;
/* Allocate the irq only if necessary */
@@ -409,41 +785,102 @@
goto esp_irq_acquired; /* BASIC rulez */
}
}
- /* XXX We have shared interrupts per level now, maybe
- * XXX use them, maybe not...
- */
- if(request_irq(esp->ehost->irq, esp_intr, SA_INTERRUPT,
+ if(request_irq(esp->ehost->irq, esp_intr, SA_SHIRQ,
"Sparc ESP SCSI", NULL))
panic("Cannot acquire ESP irq line");
esp_irq_acquired:
- printk("esp%d: IRQ %d ", nesps, esp->ehost->irq);
+ printk("esp%d: IRQ %d ", esp->esp_id, esp->ehost->irq);
+
/* Figure out our scsi ID on the bus */
esp->scsi_id = prom_getintdefault(esp->prom_node,
- "initiator-id", -1);
+ "initiator-id",
+ -1);
if(esp->scsi_id == -1)
esp->scsi_id = prom_getintdefault(esp->prom_node,
- "scsi-initiator-id", -1);
+ "scsi-initiator-id",
+ -1);
if(esp->scsi_id == -1)
esp->scsi_id =
prom_getintdefault(esp->edev->my_bus->prom_node,
- "scsi-initiator-id", 7);
+ "scsi-initiator-id",
+ 7);
esp->ehost->this_id = esp->scsi_id;
esp->scsi_id_mask = (1 << esp->scsi_id);
- /* Check for differential bus */
- esp->diff = prom_getintdefault(esp->prom_node, "differential", -1);
- esp->diff = (esp->diff == -1) ? 0 : 1;
- /* Check out the clock properties of the chip */
- fmhz = prom_getintdefault(esp->prom_node, "clock-frequency", -1);
+
+ /* Check for differential SCSI-bus */
+ esp->diff = prom_getbool(esp->prom_node, "differential");
+ if(esp->diff)
+ printk("Differential ");
+
+ /* Check out the clock properties of the chip. */
+
+ /* This is getting messy but it has to be done
+ * correctly or else you get weird behavior all
+ * over the place. We are trying to basically
+ * figure out three pieces of information.
+ *
+ * a) Clock Conversion Factor
+ *
+ * This is a representation of the input
+ * crystal clock frequency going into the
+ * ESP on this machine. Any operation whose
+ * timing is longer than 400ns depends on this
+ * value being correct. For example, you'll
+ * get blips for arbitration/selection during
+ * high load or with multiple targets if this
+ * is not set correctly.
+ *
+ * b) Selection Time-Out
+ *
+ * The ESP isn't very bright and will arbitrate
+ * for the bus and try to select a target
+ * forever if you let it. This value tells
+ * the ESP when it has taken too long to
+ * negotiate and that it should interrupt
+ * the CPU so we can see what happened.
+ * The value is computed as follows (from
+ * NCR/Symbios chip docs).
+ *
+ * (Time Out Period) * (Input Clock)
+ * STO = ----------------------------------
+ * (8192) * (Clock Conversion Factor)
+ *
+ * You usually want the time out period to be
+ * around 250ms, I think we'll set it a little
+ * bit higher to account for fully loaded SCSI
+ * bus's and slow devices that don't respond so
+ * quickly to selection attempts. (yeah, I know
+ * this is out of spec. but there is a lot of
+ * buggy pieces of firmware out there so bite me)
+ *
+ * c) Imperical constants for synchronous offset
+ * and transfer period register values
+ *
+ * This entails the smallest and largest sync
+ * period we could ever handle on this ESP.
+ */
+
+ fmhz = prom_getintdefault(esp->prom_node,
+ "clock-frequency",
+ -1);
if(fmhz==-1)
fmhz = prom_getintdefault(esp->edev->my_bus->prom_node,
- "clock-frequency", -1);
- if(fmhz <= (5000))
+ "clock-frequency",
+ -1);
+ if(fmhz <= (5000000))
ccf = 0;
else
- ccf = (((5000 - 1) + (fmhz))/(5000));
+ ccf = (((5000000 - 1) + (fmhz))/(5000000));
if(!ccf || ccf > 8) {
+ /* If we can't find anything reasonable,
+ * just assume 20MHZ. This is the clock
+ * frequency of the older sun4c's where I've
+ * been unable to find the clock-frequency
+ * PROM property. All other machines provide
+ * useful values it seems.
+ */
ccf = ESP_CCF_F4;
- fmhz = (5000 * 4);
+ fmhz = (20000000);
}
if(ccf==(ESP_CCF_F7+1))
esp->cfact = ESP_CCF_F0;
@@ -452,31 +889,38 @@
else
esp->cfact = ccf;
esp->cfreq = fmhz;
- esp->ccycle = ((1000000000) / ((fmhz)/1000));
- esp->ctick = ((7682 * esp->cfact * esp->ccycle)/1000);
- esp->sync_defp = ((7682 + esp->ctick - 1) / esp->ctick);
-
- /* XXX HACK HACK HACK XXX */
- if (esp->sync_defp < 153)
- esp->sync_defp = 153;
-
- printk("SCSI ID %d Clock %d MHz Period %2x ", esp->scsi_id,
- (fmhz / 1000), esp->sync_defp);
+ esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz);
+ esp->ctick = ESP_TICK(ccf, esp->ccycle);
+ esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf);
+ esp->sync_defp = SYNC_DEFP_SLOW;
+ printk("SCSI ID %d Clock %d MHz CCF=%d Time-Out %d ",
+ esp->scsi_id, (fmhz / 1000000),
+ ccf, (int) esp->neg_defp);
- /* Find the burst sizes this dma supports. */
+ /* Find the burst sizes this dma/sbus/esp supports. */
bsizes = prom_getintdefault(esp->prom_node, "burst-sizes", 0xff);
+ bsizes &= 0xff;
+ if(espdma) {
+ bsizes_more = prom_getintdefault(
+ espdma->prom_node,
+ "burst-sizes", 0xff);
+ if(bsizes_more != 0xff)
+ bsizes &= bsizes_more;
+ }
bsizes_more = prom_getintdefault(esp->edev->my_bus->prom_node,
"burst-sizes", 0xff);
- if(bsizes_more != 0xff) bsizes &= bsizes_more;
+ if(bsizes_more != 0xff)
+ bsizes &= bsizes_more;
+
if(bsizes == 0xff || (bsizes & DMA_BURST16)==0 ||
(bsizes & DMA_BURST32)==0)
bsizes = (DMA_BURST32 - 1);
+
esp->bursts = bsizes;
/* Probe the revision of this esp */
esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
- esp->config3[0] = ESP_CONFIG3_TENB;
eregs->esp_cfg2 = esp->config2;
if((eregs->esp_cfg2 & ~(ESP_CONFIG2_MAGIC)) !=
(ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
@@ -495,11 +939,11 @@
for(target=0; target<8; target++)
esp->config3[target] = 0;
eregs->esp_cfg3 = 0;
- if(esp->cfact > ESP_CCF_F5) {
+ if(ccf > ESP_CCF_F5) {
printk("NCR53C9XF(espfast) detected\n");
esp->erev = fast;
- esp->config2 |= ESP_CONFIG2_FENAB;
- eregs->esp_cfg2 = esp->config2;
+ eregs->esp_cfg2 = esp->config2 = 0;
+ esp->sync_defp = SYNC_DEFP_FAST;
} else {
printk("NCR53C9x(esp236) detected\n");
esp->erev = esp236;
@@ -513,20 +957,34 @@
esp->disconnected_SC = 0;
esp->issue_SC = 0;
+ /* Clear the state machines. */
+ esp->targets_present = 0;
+ esp->resetting_bus = 0;
+ esp->snip = 0;
+ esp->targets_present = 0;
+ for(i = 0; i < 32; i++)
+ esp->espcmdlog[i] = 0;
+ esp->espcmdent = 0;
+ for(i = 0; i < 16; i++) {
+ esp->cur_msgout[i] = 0;
+ esp->cur_msgin[i] = 0;
+ }
+ esp->prevmsgout = esp->prevmsgin = 0;
+ esp->msgout_len = esp->msgin_len = 0;
+
/* Reset the thing before we try anything... */
esp_bootup_reset(esp, eregs);
- nesps++;
-#ifdef THREADED_ESP_DRIVER
- kernel_thread(esp_kernel_thread, esp, 0);
-#endif
+ esps_in_use++;
} /* for each sbusdev */
} /* for each sbus */
- return nesps;
+ printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,
+ esps_in_use);
+ esps_running = esps_in_use;
+ return esps_in_use;
}
-/*
- * The info function will return whatever useful
+/* The info function will return whatever useful
* information the developer sees fit. If not provided, then
* the name field will be used instead.
*/
@@ -542,10 +1000,10 @@
return "Sparc ESP100A (NCR53C90A)";
case esp236:
return "Sparc ESP236";
- case fast:
- return "Sparc ESP-FAST (236 or 100A)";
case fas236:
return "Sparc ESP236-FAST";
+ case fashme:
+ return "Sparc ESP366-HME";
case fas100a:
return "Sparc ESP100A-FAST";
default:
@@ -553,142 +1011,710 @@
};
}
-/* Execute a SCSI command when the bus is free. All callers
- * turn off all interrupts, so we don't need to explicitly do
- * it here.
- */
-static inline void esp_exec_cmd(struct Sparc_ESP *esp)
+/* From Wolfgang Stanglmeier's NCR scsi driver. */
+struct info_str
{
- struct sparc_dma_registers *dregs;
- struct Sparc_ESP_regs *eregs;
- Scsi_Cmnd *SCptr;
- int i;
-
- eregs = esp->eregs;
- dregs = esp->dregs;
-
- /* Grab first member of the issue queue. */
- SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC);
- if(!SCptr)
- goto bad;
- SCptr->SCp.phase = in_selection;
-
- /* NCR docs say:
- * 1) Load select/reselect Bus ID register with target ID
- * 2) Load select/reselect Timeout Reg with desired value
- * 3) Load Synchronous offset register with zero (for
- * asynchronous transfers).
- * 4) Load Synchronous Transfer Period register (if
- * synchronous)
- * 5) Load FIFO with 6, 10, or 12 byte SCSI command
- * 6) Issue SELECTION_WITHOUT_ATTENTION command
- *
- * They also mention that a DMA NOP command must be issued
- * to the SCSI chip under many circumstances, plus it's
- * also a good idea to flush out the fifo just in case.
- */
-
- /* Load zeros into COUNTER via 2 DMA NOP chip commands
- * due to flaky implementations of the 53C9x which don't
- * get the idea the first time around.
- */
- dregs->cond_reg = (DMA_INT_ENAB | DMA_FIFO_INV);
+ char *buffer;
+ int length;
+ int offset;
+ int pos;
+};
- eregs->esp_tclow = 0;
- eregs->esp_tcmed = 0;
- eregs->esp_cmd = (ESP_CMD_NULL | ESP_CMD_DMA);
+static void copy_mem_info(struct info_str *info, char *data, int len)
+{
+ if (info->pos + len > info->length)
+ len = info->length - info->pos;
- /* Flush the fifo of excess garbage. */
- eregs->esp_cmd = ESP_CMD_FLUSH;
+ if (info->pos + len < info->offset) {
+ info->pos += len;
+ return;
+ }
+ if (info->pos < info->offset) {
+ data += (info->offset - info->pos);
+ len -= (info->offset - info->pos);
+ }
- /* Load bus-id and timeout values. */
- eregs->esp_busid = (SCptr->target & 7);
- eregs->esp_timeo = esp->sync_defp;
+ if (len > 0) {
+ memcpy(info->buffer + info->pos, data, len);
+ info->pos += len;
+ }
+}
- eregs->esp_soff = 0; /* This means async transfer... */
- eregs->esp_stp = 0;
+static int copy_info(struct info_str *info, char *fmt, ...)
+{
+ va_list args;
+ char buf[81];
+ int len;
+
+ va_start(args, fmt);
+ len = vsprintf(buf, fmt, args);
+ va_end(args);
- /* Load FIFO with the actual SCSI command. */
- for(i=0; i < SCptr->cmd_len; i++)
- eregs->esp_fdata = SCptr->cmnd[i];
+ copy_mem_info(info, buf, len);
+ return len;
+}
- /* Make sure the dvma forwards the ESP interrupt. */
- dregs->cond_reg = DMA_INT_ENAB;
+static int esp_host_info(struct Sparc_ESP *esp, char *ptr, off_t offset, int len)
+{
+ struct info_str info;
+ int i;
- /* Tell ESP to SELECT without asserting ATN. */
- eregs->esp_cmd = ESP_CMD_SEL;
- return;
+ info.buffer = ptr;
+ info.length = len;
+ info.offset = offset;
+ info.pos = 0;
+
+ copy_info(&info, "Sparc ESP Host Adapter:\n");
+ copy_info(&info, "\tPROM node\t\t%08lx\n", (unsigned long) esp->prom_node);
+ copy_info(&info, "\tPROM name\t\t%s\n", esp->prom_name);
+ copy_info(&info, "\tESP Model\t\t");
+ switch(esp->erev) {
+ case esp100:
+ copy_info(&info, "ESP100\n");
+ break;
+ case esp100a:
+ copy_info(&info, "ESP100A\n");
+ break;
+ case esp236:
+ copy_info(&info, "ESP236\n");
+ break;
+ case fas236:
+ copy_info(&info, "FAS236\n");
+ break;
+ case fas100a:
+ copy_info(&info, "FAS100A\n");
+ break;
+ case fast:
+ copy_info(&info, "FAST\n");
+ break;
+ case fashme:
+ copy_info(&info, "Happy Meal FAS\n");
+ break;
+ case espunknown:
+ default:
+ copy_info(&info, "Unknown!\n");
+ break;
+ };
+ copy_info(&info, "\tDMA Revision\t\t");
+ switch(esp->dma->revision) {
+ case dvmarev0:
+ copy_info(&info, "Rev 0\n");
+ break;
+ case dvmaesc1:
+ copy_info(&info, "ESC Rev 1\n");
+ break;
+ case dvmarev1:
+ copy_info(&info, "Rev 1\n");
+ break;
+ case dvmarev2:
+ copy_info(&info, "Rev 2\n");
+ break;
+ case dvmarev3:
+ copy_info(&info, "Rev 3\n");
+ break;
+ case dvmarevplus:
+ copy_info(&info, "Rev 1+\n");
+ break;
+ case dvmahme:
+ copy_info(&info, "Rev HME/FAS\n");
+ break;
+ default:
+ copy_info(&info, "Unknown!\n");
+ break;
+ };
+ copy_info(&info, "\tLive Targets\t\t[ ");
+ for(i = 0; i < 15; i++) {
+ if(esp->targets_present & (1 << i))
+ copy_info(&info, "%d ", i);
+ }
+ copy_info(&info, "]\n\n");
+
+ /* Now describe the state of each existing target. */
+ copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n");
+ for(i = 0; i < 15; i++) {
+ if(esp->targets_present & (1 << i)) {
+ Scsi_Device *SDptr = scsi_devices;
+
+ while((SDptr->host != esp->ehost) &&
+ (SDptr->id != i) &&
+ (SDptr->next))
+ SDptr = SDptr->next;
+
+ copy_info(&info, "%d\t\t", i);
+ copy_info(&info, "%08lx\t", esp->config3[i]);
+ copy_info(&info, "[%02lx,%02lx]\t\t\t", SDptr->sync_max_offset,
+ SDptr->sync_min_period);
+ copy_info(&info, "%s\t\t", SDptr->disconnect ? "yes" : "no");
+ copy_info(&info, "%s\n",
+ (esp->config3[i] & ESP_CONFIG3_EWIDE) ? "yes" : "no");
+ }
+ }
-bad:
- panic("esp: daaarrrkk starrr crashesss....");
+ return info.pos > info.offset? info.pos - info.offset : 0;
}
-/* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
-int esp_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
+/* ESP proc filesystem code. */
+int esp_proc_info(char *buffer, char **start, off_t offset, int length,
+ int hostno, int inout)
{
struct Sparc_ESP *esp;
- unsigned long flags;
-
- save_flags(flags); cli();
-
- /* Set up func ptr and initial driver cmd-phase. */
- SCpnt->scsi_done = done;
- SCpnt->SCp.phase = not_issued;
- esp = (struct Sparc_ESP *) SCpnt->host->hostdata;
+ if(inout)
+ return -EINVAL; /* not yet */
- /* We use the scratch area. */
- if(!SCpnt->use_sg) {
- SCpnt->SCp.this_residual = SCpnt->request_bufflen;
- SCpnt->SCp.buffer =
- (struct scatterlist *) SCpnt->request_buffer;
- SCpnt->SCp.buffers_residual = 0;
- SCpnt->SCp.Status = CHECK_CONDITION;
- SCpnt->SCp.Message = 0;
- SCpnt->SCp.have_data_in = 0;
- SCpnt->SCp.sent_command = 0;
- SCpnt->SCp.ptr = mmu_get_scsi_one((char *)SCpnt->SCp.buffer,
- SCpnt->SCp.this_residual,
- esp->edev->my_bus);
- } else {
-#ifdef DEBUG_ESP_SG
- printk("esp: sglist at %p with %d buffers\n",
- SCpnt->buffer, SCpnt->use_sg);
-#endif
- SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer;
- SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;
- SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
- mmu_get_scsi_sgl((struct mmu_sglist *) SCpnt->SCp.buffer,
- SCpnt->SCp.buffers_residual,
- esp->edev->my_bus);
- SCpnt->SCp.ptr = (char *) SCpnt->SCp.buffer->alt_address;
+ for_each_esp(esp) {
+ if(esp->ehost->host_no == hostno)
+ break;
}
+ if(!esp)
+ return -EINVAL;
- /* Place into our queue. */
- append_SC(&esp->issue_SC, SCpnt);
-
- /* Run it now if we can */
- if(!esp->current_SC)
- esp_exec_cmd(esp);
+ if(start)
+ *start = buffer;
- restore_flags(flags);
- return 0;
+ return esp_host_info(esp, buffer, offset, length);
}
-/* Only queuing supported in this ESP driver. */
-int esp_command(Scsi_Cmnd *SCpnt)
+/* Some rules:
+ *
+ * 1) Never ever panic while something is live on the bus.
+ * If there is to be any chance of syncing the disks this
+ * rule is to be obeyed.
+ *
+ * 2) Any target that causes a foul condition will no longer
+ * have synchronous transfers done to it, no questions
+ * asked.
+ *
+ * 3) Keep register accesses to a minimum. Think about some
+ * day when we have Xbus machines this is running on and
+ * the ESP chip is on the other end of the machine on a
+ * different board from the cpu where this is running.
+ */
+
+/* Fire off a command. We assume the bus is free and that the only
+ * case where we could see an interrupt is where we have disconnected
+ * commands active and they are trying to reselect us.
+ */
+static inline void esp_check_cmd(struct Sparc_ESP *esp, Scsi_Cmnd *sp)
{
- ESPLOG(("esp: esp_command() called...\n"));
+ switch(sp->cmd_len) {
+ case 6:
+ case 10:
+ case 12:
+ esp->esp_slowcmd = 0;
+ break;
+
+ default:
+ esp->esp_slowcmd = 1;
+ esp->esp_scmdleft = sp->cmd_len;
+ esp->esp_scmdp = &sp->cmnd[0];
+ break;
+ };
+}
+
+static inline void build_sync_nego_msg(struct Sparc_ESP *esp, int period, int offset)
+{
+ esp->cur_msgout[0] = EXTENDED_MESSAGE;
+ esp->cur_msgout[1] = 3;
+ esp->cur_msgout[2] = EXTENDED_SDTR;
+ esp->cur_msgout[3] = period;
+ esp->cur_msgout[4] = offset;
+ esp->msgout_len = 5;
+}
+
+/* SIZE is in bits, currently HME only supports 16 bit wide transfers. */
+static inline void build_wide_nego_msg(struct Sparc_ESP *esp, int size)
+{
+ esp->cur_msgout[0] = EXTENDED_MESSAGE;
+ esp->cur_msgout[1] = 2;
+ esp->cur_msgout[2] = EXTENDED_WDTR;
+ switch(size) {
+ case 32:
+ esp->cur_msgout[3] = 2;
+ break;
+ case 16:
+ esp->cur_msgout[3] = 1;
+ break;
+ case 8:
+ default:
+ esp->cur_msgout[3] = 0;
+ break;
+ };
+
+ esp->msgout_len = 4;
+}
+
+static inline void esp_exec_cmd(struct Sparc_ESP *esp)
+{
+ struct sparc_dma_registers *dregs = esp->dregs;
+ struct Sparc_ESP_regs *eregs = esp->eregs;
+ Scsi_Cmnd *SCptr;
+ Scsi_Device *SDptr;
+ volatile unchar *cmdp = esp->esp_command;
+ unsigned char the_esp_command;
+ int lun, target;
+ int i;
+
+ /* Hold off if we've been reselected. */
+ if(esp->disconnected_SC && DMA_IRQ_P(dregs)) return;
+
+ /* Grab first member of the issue queue. */
+ SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC);
+
+ /* Safe to panic here because current_SC is null. */
+ if(!SCptr) panic("esp: esp_exec_cmd and issue queue is NULL");
+
+ SDptr = SCptr->device;
+ lun = SCptr->lun;
+ target = SCptr->target;
+
+ esp->snip = 0;
+ esp->msgout_len = 0;
+
+ /* Send it out whole, or piece by piece? The ESP
+ * only knows how to automatically send out 6, 10,
+ * and 12 byte commands. I used to think that the
+ * Linux SCSI code would never throw anything other
+ * than that to us, but then again there is the
+ * SCSI generic driver which can send us anything.
+ */
+ esp_check_cmd(esp, SCptr);
+
+ /* If arbitration/selection is successful, the ESP will leave
+ * ATN asserted, causing the target to go into message out
+ * phase. The ESP will feed the target the identify and then
+ * the target can only legally go to one of command,
+ * datain/out, status, or message in phase, or stay in message
+ * out phase (should we be trying to send a sync negotiation
+ * message after the identify). It is not allowed to drop
+ * BSY, but some buggy targets do and we check for this
+ * condition in the selection complete code. Most of the time
+ * we'll make the command bytes available to the ESP and it
+ * will not interrupt us until it finishes command phase, we
+ * cannot do this for command sizes the ESP does not
+ * understand and in this case we'll get interrupted right
+ * when the target goes into command phase.
+ *
+ * It is absolutely _illegal_ in the presence of SCSI-2 devices
+ * to use the ESP select w/o ATN command. When SCSI-2 devices are
+ * present on the bus we _must_ always go straight to message out
+ * phase with an identify message for the target. Being that
+ * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
+ * selections should not confuse SCSI-1 we hope.
+ */
+
+ if(SDptr->sync) {
+ /* this targets sync is known */
+do_sync_known:
+ if(SDptr->disconnect)
+ *cmdp++ = IDENTIFY(1, lun);
+ else
+ *cmdp++ = IDENTIFY(0, lun);
+
+ if(esp->esp_slowcmd) {
+ the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
+ esp_advance_phase(SCptr, in_slct_stop);
+ } else {
+ the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
+ esp_advance_phase(SCptr, in_slct_norm);
+ }
+ } else if(!(esp->targets_present & (1<<target)) || !(SDptr->disconnect)) {
+ /* After the bootup SCSI code sends both the
+ * TEST_UNIT_READY and INQUIRY commands we want
+ * to at least attempt allowing the device to
+ * disconnect.
+ */
+ ESPMISC(("esp: Selecting device for first time. target=%d "
+ "lun=%d\n", target, SCptr->lun));
+ if(!SDptr->borken && !SDptr->disconnect)
+ SDptr->disconnect = 1;
+
+ *cmdp++ = IDENTIFY(0, lun);
+ esp->prevmsgout = NOP;
+ esp_advance_phase(SCptr, in_slct_norm);
+ the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
+
+ /* Take no chances... */
+ SDptr->sync_max_offset = 0;
+ SDptr->sync_min_period = 0;
+ } else {
+ int toshiba_cdrom_hwbug_wkaround = 0;
+
+ /* Never allow disconnects or synchronous transfers on
+ * SparcStation1 and SparcStation1+. Allowing those
+ * to be enabled seems to lockup the machine completely.
+ */
+ if((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
+ (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
+ /* But we are nice and allow tapes to disconnect. */
+ if(SDptr->type == TYPE_TAPE)
+ SDptr->disconnect = 1;
+ else
+ SDptr->disconnect = 0;
+ SDptr->sync_max_offset = 0;
+ SDptr->sync_min_period = 0;
+ SDptr->sync = 1;
+ esp->snip = 0;
+ goto do_sync_known;
+ }
+
+ /* We've talked to this guy before,
+ * but never negotiated.. lets try,
+ * need to attempt WIDE first, before
+ * sync nego, as per SCSI 2 standard.
+ */
+ if(esp->erev == fashme && !SDptr->wide) {
+ if(!SDptr->borken &&
+ (SDptr->type != TYPE_ROM ||
+ strncmp(SDptr->vendor, "TOSHIBA", 7))) {
+ build_wide_nego_msg(esp, 16);
+ esp->config3[SCptr->target] |= ESP_CONFIG3_EWIDE;
+ SDptr->wide = 1;
+ esp->wnip = 1;
+ goto after_nego_msg_built;
+ } else {
+ SDptr->wide = 1;
+ /* Fall through and try sync. */
+ }
+ }
+
+ if(!SDptr->borken) {
+ if((SDptr->type == TYPE_ROM) &&
+ (!strncmp(SDptr->vendor, "TOSHIBA", 7))) {
+ /* Nice try sucker... */
+ printk(KERN_INFO "esp%d: Disabling sync for buggy "
+ "Toshiba CDROM.\n", esp->esp_id);
+ toshiba_cdrom_hwbug_wkaround = 1;
+ build_sync_nego_msg(esp, 0, 0);
+ } else {
+ build_sync_nego_msg(esp, esp->sync_defp, 15);
+ }
+ } else {
+ build_sync_nego_msg(esp, 0, 0);
+ }
+ SDptr->sync = 1;
+ esp->snip = 1;
+
+after_nego_msg_built:
+ /* A fix for broken SCSI1 targets, when they disconnect
+ * they lock up the bus and confuse ESP. So disallow
+ * disconnects for SCSI1 targets for now until we
+ * find a better fix.
+ *
+ * Addendum: This is funny, I figured out what was going
+ * on. The blotzed SCSI1 target would disconnect,
+ * one of the other SCSI2 targets or both would be
+ * disconnected as well. The SCSI1 target would
+ * stay disconnected long enough that we start
+ * up a command on one of the SCSI2 targets. As
+ * the ESP is arbitrating for the bus the SCSI1
+ * target begins to arbitrate as well to reselect
+ * the ESP. The SCSI1 target refuses to drop it's
+ * ID bit on the data bus even though the ESP is
+ * at ID 7 and is the obvious winner for any
+ * arbitration. The ESP is a poor sport and refuses
+ * to lose arbitration, it will continue indefinately
+ * trying to arbitrate for the bus and can only be
+ * stopped via a chip reset or SCSI bus reset.
+ * Therefore _no_ disconnects for SCSI1 targets
+ * thank you very much. ;-)
+ */
+ if(((SDptr->scsi_level < 3) && (SDptr->type != TYPE_TAPE)) ||
+#if 1 /* Until I find out why HME barfs with disconnects enabled... */
+ toshiba_cdrom_hwbug_wkaround || SDptr->borken || esp->erev == fashme) {
+#else
+ toshiba_cdrom_hwbug_wkaround || SDptr->borken) {
+#endif
+ printk(KERN_INFO "esp%d: Disabling DISCONNECT for target %d "
+ "lun %d\n", esp->esp_id, SCptr->target, SCptr->lun);
+ SDptr->disconnect = 0;
+ *cmdp++ = IDENTIFY(0, lun);
+ } else {
+ *cmdp++ = IDENTIFY(1, lun);
+ }
+
+ /* ESP fifo is only so big...
+ * Make this look like a slow command.
+ */
+ esp->esp_slowcmd = 1;
+ esp->esp_scmdleft = SCptr->cmd_len;
+ esp->esp_scmdp = &SCptr->cmnd[0];
+
+ the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
+ esp_advance_phase(SCptr, in_slct_msg);
+ }
+
+ if(!esp->esp_slowcmd)
+ for(i = 0; i < SCptr->cmd_len; i++)
+ *cmdp++ = SCptr->cmnd[i];
+
+ /* HME sucks... */
+ if(esp->erev == fashme)
+ eregs->esp_busid = (target & 0xf) |
+ (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT);
+ else
+ eregs->esp_busid = (target & 7);
+ eregs->esp_soff = SDptr->sync_max_offset;
+ eregs->esp_stp = SDptr->sync_min_period;
+ if(esp->erev > esp100a)
+ eregs->esp_cfg3 = esp->config3[target];
+
+ i = (cmdp - esp->esp_command);
+
+ if(esp->erev == fashme) {
+ unsigned long tmp;
+
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* Grrr! */
+
+ /* Set up the DMA and HME counters */
+ eregs->esp_tclow = i;
+ eregs->esp_tcmed = 0;
+ eregs->fas_rlo = 0;
+ eregs->fas_rhi = 0;
+ esp_cmd(esp, eregs, the_esp_command);
+
+ /* Talk about touchy hardware... */
+ tmp = dregs->cond_reg;
+ tmp |= (DMA_SCSI_DISAB | DMA_ENABLE);
+ tmp &= ~(DMA_ST_WRITE);
+ dregs->cnt = 16;
+ dregs->st_addr = esp->esp_command;
+ dregs->cond_reg = tmp;
+ } else {
+ /* Set up the DMA and ESP counters */
+ eregs->esp_tclow = i;
+ eregs->esp_tcmed = 0;
+ dregs->cond_reg = ((dregs->cond_reg & ~(DMA_ST_WRITE)) | DMA_ENABLE);
+ if(esp->dma->revision == dvmaesc1) {
+ if(i) /* Workaround ESC gate array SBUS rerun bug. */
+ dregs->cnt = (PAGE_SIZE);
+ }
+ dregs->st_addr = esp->esp_command;
+
+ /* Tell ESP to "go". */
+ esp_cmd(esp, eregs, the_esp_command);
+ }
+}
+
+/* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
+int esp_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
+{
+ struct Sparc_ESP *esp;
+ struct sparc_dma_registers *dregs;
+ unsigned long flags;
+ int don;
+
+ save_flags(flags); cli();
+
+ /* Set up func ptr and initial driver cmd-phase. */
+ SCpnt->scsi_done = done;
+ SCpnt->SCp.phase = not_issued;
+
+ esp = (struct Sparc_ESP *) SCpnt->host->hostdata;
+ dregs = esp->dregs;
+
+ don = (dregs->cond_reg & DMA_INT_ENAB);
+ if(don)
+ DMA_INTSOFF(dregs);
+
+ /* We use the scratch area. */
+ ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->target, SCpnt->lun));
+ ESPDISC(("N<%02x,%02x>", SCpnt->target, SCpnt->lun));
+ if(!SCpnt->use_sg) {
+ ESPQUEUE(("!use_sg\n"));
+ SCpnt->SCp.this_residual = SCpnt->request_bufflen;
+ SCpnt->SCp.buffer =
+ (struct scatterlist *) SCpnt->request_buffer;
+ SCpnt->SCp.buffers_residual = 0;
+ /* Sneaky. */
+ SCpnt->SCp.have_data_in = (int) SCpnt->SCp.ptr =
+ mmu_get_scsi_one((char *)SCpnt->SCp.buffer,
+ SCpnt->SCp.this_residual,
+ esp->edev->my_bus);
+ } else {
+ ESPQUEUE(("use_sg "));
+#ifdef DEBUG_ESP_SG
+ printk("esp%d: sglist at %p with %d buffers\n",
+ esp->esp_id, SCpnt->buffer, SCpnt->use_sg);
+#endif
+ SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer;
+ SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;
+ SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
+ mmu_get_scsi_sgl((struct mmu_sglist *) SCpnt->SCp.buffer,
+ SCpnt->SCp.buffers_residual,
+ esp->edev->my_bus);
+ SCpnt->SCp.ptr = (char *) SCpnt->SCp.buffer->dvma_address;
+ }
+ SCpnt->SCp.Status = CHECK_CONDITION;
+ SCpnt->SCp.Message = 0xff;
+ SCpnt->SCp.sent_command = 0;
+
+ /* Place into our queue. */
+ if(SCpnt->cmnd[0] == REQUEST_SENSE) {
+ ESPQUEUE(("RQSENSE\n"));
+ prepend_SC(&esp->issue_SC, SCpnt);
+ } else {
+ ESPQUEUE(("\n"));
+ append_SC(&esp->issue_SC, SCpnt);
+ }
+
+ /* Run it now if we can. */
+ if(!esp->current_SC && !esp->resetting_bus)
+ esp_exec_cmd(esp);
+
+ if(don)
+ DMA_INTSON(dregs);
+ restore_flags(flags);
+ return 0;
+}
+
+/* Only queuing supported in this ESP driver. */
+int esp_command(Scsi_Cmnd *SCpnt)
+{
+ struct Sparc_ESP *esp = (struct Sparc_ESP *) SCpnt->host->hostdata;
+
+ ESPLOG(("esp%d: esp_command() called...\n", esp->esp_id));
return -1;
}
-/* Abort a command. Those that are on the bus force a SCSI bus
- * reset.
- */
-int esp_abort(Scsi_Cmnd *SCpnt)
+/* Dump driver state. */
+static inline void esp_dump_cmd(Scsi_Cmnd *SCptr)
+{
+ ESPLOG(("[tgt<%02x> lun<%02x> "
+ "pphase<%s> cphase<%s>]",
+ SCptr->target, SCptr->lun,
+ phase_string(SCptr->SCp.sent_command),
+ phase_string(SCptr->SCp.phase)));
+}
+
+static inline void esp_dump_state(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+#ifdef DEBUG_ESP_CMDS
+ int i;
+#endif
+
+ ESPLOG(("esp%d: dumping state\n", esp->esp_id));
+ ESPLOG(("esp%d: dma -- cond_reg<%08lx> addr<%p>\n",
+ esp->esp_id, dregs->cond_reg, dregs->st_addr));
+ ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
+ esp->esp_id, esp->sreg, esp->seqreg, esp->ireg));
+ ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
+ esp->esp_id, eregs->esp_status, eregs->esp_sstep, eregs->esp_intrpt));
+#ifdef DEBUG_ESP_CMDS
+ printk("esp%d: last ESP cmds [", esp->esp_id);
+ i = (esp->espcmdent - 1) & 31;
+ printk("<");
+ esp_print_cmd(esp->espcmdlog[i]);
+ printk(">");
+ i = (i - 1) & 31;
+ printk("<");
+ esp_print_cmd(esp->espcmdlog[i]);
+ printk(">");
+ i = (i - 1) & 31;
+ printk("<");
+ esp_print_cmd(esp->espcmdlog[i]);
+ printk(">");
+ i = (i - 1) & 31;
+ printk("<");
+ esp_print_cmd(esp->espcmdlog[i]);
+ printk(">");
+ printk("]\n");
+#endif /* (DEBUG_ESP_CMDS) */
+
+ if(SCptr) {
+ ESPLOG(("esp%d: current command ", esp->esp_id));
+ esp_dump_cmd(SCptr);
+ }
+ ESPLOG(("\n"));
+ SCptr = esp->disconnected_SC;
+ ESPLOG(("esp%d: disconnected ", esp->esp_id));
+ while(SCptr) {
+ esp_dump_cmd(SCptr);
+ SCptr = (Scsi_Cmnd *) SCptr->host_scribble;
+ }
+ ESPLOG(("\n"));
+}
+
+/* Abort a command. */
+int esp_abort(Scsi_Cmnd *SCptr)
{
- ESPLOG(("esp_abort: Not implemented yet\n"));
- return SCSI_ABORT_ERROR;
+ struct Sparc_ESP *esp = (struct Sparc_ESP *) SCptr->host->hostdata;
+ struct Sparc_ESP_regs *eregs = esp->eregs;
+ struct sparc_dma_registers *dregs = esp->dregs;
+ unsigned long flags;
+ int don;
+
+ ESPLOG(("esp%d: Aborting command\n", esp->esp_id));
+ save_flags(flags); cli();
+
+ esp_dump_state(esp, eregs, dregs);
+
+ /* Wheee, if this is the current command on the bus, the
+ * best we can do is assert ATN and wait for msgout phase.
+ * This should even fix a hung SCSI bus when we lose state
+ * in the driver and timeout because the eventual phase change
+ * will cause the ESP to (eventually) give an interrupt.
+ */
+ if(esp->current_SC == SCptr) {
+ esp->cur_msgout[0] = ABORT;
+ esp->msgout_len = 1;
+ esp->msgout_ctr = 0;
+ esp_cmd(esp, eregs, ESP_CMD_SATN);
+ restore_flags(flags);
+ return SCSI_ABORT_PENDING;
+ }
+
+ /* If it is still in the issue queue then we can safely
+ * call the completion routine and report abort success.
+ */
+ don = (dregs->cond_reg & DMA_INT_ENAB);
+ if(don)
+ DMA_INTSOFF(dregs);
+ if(esp->issue_SC) {
+ Scsi_Cmnd **prev, *this;
+ for(prev = (&esp->issue_SC), this = esp->issue_SC;
+ this;
+ prev = (Scsi_Cmnd **) &(this->host_scribble),
+ this = (Scsi_Cmnd *) this->host_scribble) {
+ if(this == SCptr) {
+ *prev = (Scsi_Cmnd *) this->host_scribble;
+ this->host_scribble = NULL;
+ this->result = DID_ABORT << 16;
+ this->done(this);
+ cli();
+ if(don)
+ DMA_INTSON(dregs);
+ restore_flags(flags);
+ return SCSI_ABORT_SUCCESS;
+ }
+ }
+ }
+
+ /* Yuck, the command to abort is disconnected, it is not
+ * worth trying to abort it now if something else is live
+ * on the bus at this time. So, we let the SCSI code wait
+ * a little bit and try again later.
+ */
+ if(esp->current_SC) {
+ if(don)
+ DMA_INTSON(dregs);
+ restore_flags(flags);
+ return SCSI_ABORT_BUSY;
+ }
+
+ /* It's disconnected, we have to reconnect to re-establish
+ * the nexus and tell the device to abort. However, we really
+ * cannot 'reconnect' per se, therefore we tell the upper layer
+ * the safest thing we can. This is, wait a bit, if nothing
+ * happens, we are really hung so reset the bug.
+ */
+
+ if(don)
+ DMA_INTSON(dregs);
+ restore_flags(flags);
+ return SCSI_ABORT_SNOOZE;
}
/* Reset ESP chip, reset hanging bus, then kill active and
@@ -696,8 +1722,13 @@
*/
int esp_reset(Scsi_Cmnd *SCptr, unsigned int how)
{
- ESPLOG(("esp_reset: Not implemented yet\n"));
- return SCSI_RESET_ERROR;
+ struct Sparc_ESP *esp = (struct Sparc_ESP *) SCptr->host->hostdata;
+ struct Sparc_ESP_regs *eregs = esp->eregs;
+
+ ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id));
+ esp->resetting_bus = 1;
+ esp_cmd(esp, eregs, ESP_CMD_RS);
+ return SCSI_RESET_PENDING;
}
/* Internal ESP done function. */
@@ -709,17 +1740,20 @@
if(esp->current_SC) {
/* Critical section... */
save_flags(flags); cli();
+
done_SC = esp->current_SC;
esp->current_SC = NULL;
+
/* Free dvma entry. */
if(!done_SC->use_sg) {
- mmu_release_scsi_one(done_SC->SCp.ptr,
- done_SC->SCp.this_residual,
- esp->edev->my_bus);
+ /* Sneaky. */
+ mmu_release_scsi_one((char *)done_SC->SCp.have_data_in,
+ done_SC->request_bufflen,
+ esp->edev->my_bus);
} else {
struct scatterlist *scl = (struct scatterlist *)done_SC->buffer;
#ifdef DEBUG_ESP_SG
- printk("esp: unmapping sg ");
+ printk("esp%d: unmapping sg ", esp->esp_id);
#endif
mmu_release_scsi_sgl((struct mmu_sglist *) scl,
done_SC->use_sg - 1,
@@ -728,387 +1762,2292 @@
printk("done.\n");
#endif
}
+
done_SC->result = error;
if(done_SC->scsi_done)
done_SC->scsi_done(done_SC);
else
panic("esp: esp->current_SC->scsi_done() == NULL");
+ /* There is a window of time within the scsi_done() path
+ * of execution where interrupts are turned back on full
+ * blast and left that way. During that time we could
+ * reconnect to a disconnected command, then we'd bomb
+ * out below. We could also end up executing two commands
+ * at _once_. ...just so you know why the cli() is here...
+ */
+
+ cli(); /* GRRR!!! */
+
/* Bus is free, issue any commands in the queue. */
- if(esp->issue_SC)
+ if(esp->issue_SC && !esp->current_SC)
esp_exec_cmd(esp);
restore_flags(flags);
/* End of critical section... */
- } else
+ } else {
+ /* Panic is safe as current_SC is null so we may still
+ * be able to accept more commands to sync disk buffers.
+ */
+ ESPLOG(("panicing\n"));
panic("esp: done() called with NULL esp->current_SC");
+ }
}
-#ifdef THREADED_ESP_DRIVER /* planning stage... */
+/* Wheee, ESP interrupt engine. */
-/* With multiple lots of commands being processed I frequently
- * see a situation where we see galloping esp herds. esp_done()
- * wakes the entire world up and each interrupt causes a reschedule.
- * This kernel thread fixes some of these unwanted effects during
- * IO intensive activity.... I hope...
- */
+enum {
+ do_phase_determine, do_reset_bus, do_reset_complete,
+ do_work_bus, do_intr_end,
+};
+
+/* Forward declarations. */
+static int esp_do_phase_determine(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs);
+static int esp_do_data_finale(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs);
+static int esp_select_complete(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs);
+static int esp_do_status(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs);
+static int esp_do_msgin(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs);
+static int esp_do_msgindone(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs);
+static int esp_do_msgout(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs);
+static int esp_do_cmdbegin(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs);
-static void esp_kernel_thread(void *opaque)
+static inline int sreg_datainp(unchar sreg)
{
- struct Sparc_ESP *esp = opaque;
+ return (sreg & ESP_STAT_PMASK) == ESP_DIP;
+}
- for(;;) {
- unsigned long flags;
+static inline int sreg_dataoutp(unchar sreg)
+{
+ return (sreg & ESP_STAT_PMASK) == ESP_DOP;
+}
- while(esp->eatme_SC) {
- struct Scsi_Cmnd *SCpnt;
+/* Did they drop these fabs on the floor or what?!?!! */
+static inline void hme_fifo_hwbug_workaround(struct Sparc_ESP *esp,
+ struct Sparc_ESP_regs *eregs)
+{
+ unchar status = esp->sreg;
+
+ /* Cannot safely frob the fifo for these following cases. */
+ if(sreg_datainp(status) || sreg_dataoutp(status) ||
+ (esp->current_SC && esp->current_SC->SCp.phase == in_data_done)) {
+ ESPHME(("<wkaround_skipped>"));
+ return;
+ } else {
+ unsigned long count = 0;
+ unsigned long fcnt = eregs->esp_fflags & ESP_FF_FBYTES;
- SCpnt = remove_first_SC(esp->eatme_SC);
- esp_done(esp, error, SCpnt);
+ /* The HME stores bytes in multiples of 2 in the fifo. */
+ ESPHME(("hme_fifo[fcnt=%d", (int)fcnt));
+ while(fcnt) {
+ esp->hme_fifo_workaround_buffer[count++] = eregs->esp_fdata;
+ esp->hme_fifo_workaround_buffer[count++] = eregs->esp_fdata;
+ ESPHME(("<%02x,%02x>", esp->hme_fifo_workaround_buffer[count-2], esp->hme_fifo_workaround_buffer[count-1]));
+ fcnt--;
+ }
+ if(eregs->esp_status2 & ESP_STAT2_F1BYTE) {
+ ESPHME(("<poke_byte>"));
+ eregs->esp_fdata = 0;
+ esp->hme_fifo_workaround_buffer[count++] = eregs->esp_fdata;
+ ESPHME(("<%02x,0x00>", esp->hme_fifo_workaround_buffer[count-1]));
+ ESPHME(("CMD_FLUSH"));
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ } else {
+ ESPHME(("no_xtra_byte"));
}
- sleep();
+ esp->hme_fifo_workaround_count = count;
+ ESPHME(("wkarnd_cnt=%d]", (int)count));
}
}
-#endif
-/* Read the interrupt status registers on this ESP board */
-static inline void esp_updatesoft(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs)
+static inline void hme_fifo_push(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ unchar *bytes, unchar count)
{
- /* Update our software copies of the three ESP status
- * registers for this ESP. Be careful, reading the
- * ESP interrupt register clears the status and sequence
- * step registers (unlatches them, you get the idea).
- * So read the interrupt register last.
- */
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ while(count) {
+ eregs->esp_fdata = *bytes++;
+ eregs->esp_fdata = 0;
+ count--;
+ }
+}
- esp->seqreg = eregs->esp_sstep;
- esp->sreg = eregs->esp_status;
+/* We try to avoid some interrupts by jumping ahead and see if the ESP
+ * has gotten far enough yet. Hence the following.
+ */
+static inline int skipahead1(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs,
+ Scsi_Cmnd *scp, int prev_phase, int new_phase)
+{
+ if(scp->SCp.sent_command != prev_phase)
+ return 0;
+ if(DMA_IRQ_P(dregs)) {
+ /* Yes, we are able to save an interrupt. */
+ esp->sreg = eregs->esp_status;
+ if(esp->erev == fashme) {
+ /* This chip is really losing. */
+ ESPHME(("HME["));
+ /* Must latch fifo before reading the interrupt
+ * register else garbage ends up in the FIFO
+ * which confuses the driver utterly.
+ * Happy Meal indeed....
+ */
+ ESPHME(("fifo_workaround]"));
+ hme_fifo_hwbug_workaround(esp, eregs);
+ }
+ esp->ireg = eregs->esp_intrpt;
+ esp->sreg &= ~(ESP_STAT_INTR);
+ if(!(esp->ireg & ESP_INTR_SR))
+ return 0;
+ else
+ return do_reset_complete;
+ }
+ /* Ho hum, target is taking forever... */
+ scp->SCp.sent_command = new_phase; /* so we don't recurse... */
+ return do_intr_end;
+}
- /* Supposedly, the ESP100A and above assert the highest
- * bit in the status register if an interrupt is pending.
- * I've never seen this work properly, so let's clear it
- * manually while we are here. If I see any esp chips
- * for which this bit is reliable I will conditionalize
- * this. However, I don't see what this extra bit can
- * buy me with all the tests I'll have to place all over
- * the code to actually use it when I 'can'. Plus the
- * 'pending interrupt' condition can more than reliably
- * be obtained from the DVMA control register.
- *
- * "Broken hardware" -Linus
- */
- esp->sreg &= (~ESP_STAT_INTR);
- esp->ireg = eregs->esp_intrpt; /* Must be last or we lose */
+static inline int skipahead2(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs,
+ Scsi_Cmnd *scp, int prev_phase1, int prev_phase2,
+ int new_phase)
+{
+ if(scp->SCp.sent_command != prev_phase1 &&
+ scp->SCp.sent_command != prev_phase2)
+ return 0;
+ if(DMA_IRQ_P(dregs)) {
+ /* Yes, we are able to save an interrupt. */
+ esp->sreg = eregs->esp_status;
+ if(esp->erev == fashme) {
+ /* This chip is really losing. */
+ ESPHME(("HME["));
+
+ /* Must latch fifo before reading the interrupt
+ * register else garbage ends up in the FIFO
+ * which confuses the driver utterly.
+ * Happy Meal indeed....
+ */
+ ESPHME(("fifo_workaround]"));
+ hme_fifo_hwbug_workaround(esp, eregs);
+ }
+ esp->ireg = eregs->esp_intrpt;
+ esp->sreg &= ~(ESP_STAT_INTR);
+ if(!(esp->ireg & ESP_INTR_SR))
+ return 0;
+ else
+ return do_reset_complete;
+ }
+ /* Ho hum, target is taking forever... */
+ scp->SCp.sent_command = new_phase; /* so we don't recurse... */
+ return do_intr_end;
}
-/* #define ESP_IRQ_TRACE */
+/* Now some dma helpers. */
+static inline void dma_setup(struct sparc_dma_registers *dregs, enum dvma_rev drev,
+ char *addr, int count, int write)
+{
+ unsigned long nreg = dregs->cond_reg;
+ if(write)
+ nreg |= DMA_ST_WRITE;
+ else
+ nreg &= ~(DMA_ST_WRITE);
+ nreg |= DMA_ENABLE;
+ dregs->cond_reg = nreg;
+ if(drev == dvmaesc1) {
+ /* This ESC gate array sucks! */
+ unsigned long src = ((unsigned long) addr);
+ unsigned long dest = src + count;
+
+ if(dest & (PAGE_SIZE - 1))
+ count = PAGE_ALIGN(count);
+ dregs->cnt = count;
+ }
+ dregs->st_addr = addr;
+}
-#ifdef ESP_IRQ_TRACE
-#define ETRACE(foo) printk foo
-#else
-#define ETRACE(foo)
-#endif
+static inline void dma_drain(struct sparc_dma_registers *dregs, enum dvma_rev drev)
+{
+ if(drev == dvmahme)
+ return;
+ if(dregs->cond_reg & DMA_FIFO_ISDRAIN) {
+ switch(drev) {
+ default:
+ dregs->cond_reg |= DMA_FIFO_STDRAIN;
-static char last_fflags, last_status, last_msg;
+ case dvmarev3:
+ case dvmaesc1:
+ while(dregs->cond_reg & DMA_FIFO_ISDRAIN)
+ udelay(1);
+ };
+ }
+}
-/* Main interrupt handler for an esp adapter. */
-static inline void esp_handle(struct Sparc_ESP *esp)
+static inline void dma_invalidate(struct sparc_dma_registers *dregs, enum dvma_rev drev)
{
- struct sparc_dma_registers *dregs;
- struct Sparc_ESP_regs *eregs;
- Scsi_Cmnd *SCptr;
+ unsigned long tmp;
- eregs = esp->eregs;
- dregs = esp->dregs;
- SCptr = esp->current_SC;
+ if(drev == dvmahme) {
+ /* SMCC can bite me. */
+ tmp = dregs->cond_reg;
+ dregs->cond_reg = DMA_RST_SCSI;
+ tmp |= (DMA_PARITY_OFF|DMA_2CLKS|DMA_SCSI_DISAB|DMA_INT_ENAB);
+ tmp &= ~(DMA_ENABLE|DMA_ST_WRITE);
+ dregs->cond_reg = 0;
+ dregs->cond_reg = tmp;
+ } else {
+ while(dregs->cond_reg & DMA_PEND_READ)
+ udelay(1);
- DMA_IRQ_ENTRY(esp->dma, dregs);
- esp_updatesoft(esp, eregs);
+ tmp = dregs->cond_reg;
+ tmp &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB);
+ tmp |= DMA_FIFO_INV;
+ dregs->cond_reg = tmp;
+ dregs->cond_reg = (tmp & ~(DMA_FIFO_INV));
+ }
+}
- ETRACE(("ESPIRQ: <%2x,%2x,%2x> --> ", esp->ireg, esp->sreg, esp->seqreg));
+static inline void dma_flashclear(struct sparc_dma_registers *dregs, enum dvma_rev drev)
+{
+ dma_drain(dregs, drev);
+ dma_invalidate(dregs, drev);
+}
- /* Check for errors. */
- if(!SCptr)
- panic("esp_handle: current_SC == penguin within interrupt!");
+static inline int dma_can_transfer(Scsi_Cmnd *sp, enum dvma_rev drev)
+{
+ unsigned long base, end, sz;
- /* At this point in time, this esp driver should not see
- * scsibus resets, parity errors, or gross errors unless
- * something truly terrible happens which we are not ready
- * to properly recover from yet.
- */
- if((esp->ireg & (ESP_INTR_SR | ESP_INTR_IC)) ||
- (esp->sreg & (ESP_STAT_PERR | ESP_STAT_SPAM))) {
- printk("esp: really bad error detected\n");
- printk("esp: intr<%2x> stat<%2x> seq<%2x>",
- esp->ireg, esp->sreg, esp->seqreg);
- printk("esp: SCptr->SCp.phase = %d\n", SCptr->SCp.phase);
- panic("esp: cannot continue\n");
+ if(drev == dvmarev3) {
+ sz = sp->SCp.this_residual;
+ if(sz > 0x1000000)
+ sz = 0x1000000;
+ } else {
+ base = (unsigned long) sp->SCp.ptr;
+ base &= (0x1000000 - 1);
+ end = (base + sp->SCp.this_residual);
+ if(end > 0x1000000)
+ end = 0x1000000;
+ sz = (end - base);
}
- if(dregs->cond_reg & DMA_HNDL_ERROR) {
- printk("esp: DMA shows an error cond_reg<%08lx> addr<%p>\n",
- dregs->cond_reg, dregs->st_addr);
- printk("esp: intr<%2x> stat<%2x> seq<%2x>",
- esp->ireg, esp->sreg, esp->seqreg);
- printk("esp: SCptr->SCp.phase = %d\n", SCptr->SCp.phase);
- panic("esp: cannot continue\n");
- }
- if(esp->sreg & ESP_STAT_PERR) {
- printk("esp: SCSI bus parity error\n");
- printk("esp: intr<%2x> stat<%2x> seq<%2x>",
- esp->ireg, esp->sreg, esp->seqreg);
- printk("esp: SCptr->SCp.phase = %d\n", SCptr->SCp.phase);
- panic("esp: cannot continue\n");
+ return sz;
+}
+
+/* Misc. esp helper routines. */
+static inline void esp_setcount(struct Sparc_ESP_regs *eregs, int cnt, int hme)
+{
+ eregs->esp_tclow = (cnt & 0xff);
+ eregs->esp_tcmed = ((cnt >> 8) & 0xff);
+ if(hme) {
+ eregs->fas_rlo = 0;
+ eregs->fas_rhi = 0;
}
+}
- /* Service interrupt. */
- switch(SCptr->SCp.phase) {
- case not_issued:
- panic("Unexpected ESP interrupt, current_SC not issued.");
- break;
- case in_selection:
- if(esp->ireg & ESP_INTR_RSEL) {
- /* XXX Some day XXX */
- panic("ESP penguin reselected in async mode.");
- } else if(esp->ireg & ESP_INTR_DC) {
- /* Either we are scanning the bus and no-one
- * lives at this target or it didn't respond.
- */
- ETRACE(("DISCONNECT\n"));
-#ifdef THREADED_ESP_DRIVER
- append_SC(esp->eatme_SC, esp->current_SC);
- esp->current_SC = 0;
- wake_up(esp_kernel_thread);
-#else
- esp_done(esp, (DID_NO_CONNECT << 16));
-#endif
- goto esp_handle_done;
- } else if((esp->ireg & (ESP_INTR_FDONE | ESP_INTR_BSERV)) ==
- (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
- /* Selection successful, check the sequence step. */
- /* XXX I know, I know... add error recovery. XXX */
- switch(esp->seqreg & ESP_STEP_VBITS) {
- case ESP_STEP_NCMD:
- panic("esp: penguin didn't enter cmd phase.");
- break;
- case ESP_STEP_PPC:
- panic("esp: penguin prematurely changed from cmd phase.");
- break;
- case ESP_STEP_FINI:
- /* At the completion of every command
- * or message-out phase, we _must_
- * unlatch the fifo-flags register
- * with an ESP nop command.
- */
- eregs->esp_cmd = ESP_CMD_NULL;
+static inline int esp_getcount(struct Sparc_ESP_regs *eregs)
+{
+ return (((eregs->esp_tclow)&0xff) |
+ (((eregs->esp_tcmed)&0xff) << 8));
+}
- /* Selection/Command sequence completed. We
- * (at least for this driver) will be in
- * either one of the data phases or status
- * phase, check the status register to find
- * out.
- */
- switch(esp->sreg & ESP_STAT_PMASK) {
- default:
- printk("esp: Not datain/dataout/status.\n");
- panic("esp: penguin phase transition after selection.");
- break;
- case ESP_DOP:
- /* Data out phase. */
- dregs->cond_reg |= DMA_FIFO_INV;
- while(dregs->cond_reg & DMA_FIFO_ISDRAIN)
- barrier();
- SCptr->SCp.phase = in_dataout;
-#ifdef DEBUG_ESP_SG
- if(SCptr->use_sg)
- printk("esp: sg-start <%p,%d>",
- SCptr->SCp.ptr,
- SCptr->SCp.this_residual);
-#endif
- eregs->esp_tclow = SCptr->SCp.this_residual;
- eregs->esp_tcmed = (SCptr->SCp.this_residual>>8);
- eregs->esp_cmd = (ESP_CMD_DMA | ESP_CMD_NULL);
-
- /* This is either the one buffer dvma ptr,
- * or the first one in the scatter gather
- * list. Check out esp_queue to see how
- * this is set up.
- */
- dregs->st_addr = SCptr->SCp.ptr;
- dregs->cond_reg &= ~(DMA_ST_WRITE);
- dregs->cond_reg |= (DMA_ENABLE | DMA_INT_ENAB);
- eregs->esp_cmd = (ESP_CMD_DMA | ESP_CMD_TI);
- ETRACE(("DATA_OUT\n"));
- goto esp_handle_done;
- case ESP_DIP:
- /* Data in phase. */
- dregs->cond_reg |= DMA_FIFO_INV;
- while(dregs->cond_reg & DMA_FIFO_ISDRAIN)
- barrier();
- SCptr->SCp.phase = in_datain;
-#ifdef DEBUG_ESP_SG
- if(SCptr->use_sg)
- printk("esp: sg-start <%p,%d>",
- SCptr->SCp.ptr,
- SCptr->SCp.this_residual);
-#endif
- eregs->esp_tclow = SCptr->SCp.this_residual;
- eregs->esp_tcmed = (SCptr->SCp.this_residual>>8);
- eregs->esp_cmd = (ESP_CMD_DMA | ESP_CMD_NULL);
-
- /* This is either the one buffer dvma ptr,
- * or the first one in the scatter gather
- * list. Check out esp_queue to see how
- * this is set up.
- */
- dregs->st_addr = SCptr->SCp.ptr;
- dregs->cond_reg |= (DMA_ENABLE | DMA_ST_WRITE | DMA_INT_ENAB);
- eregs->esp_cmd = (ESP_CMD_DMA | ESP_CMD_TI);
- ETRACE(("DATA_IN\n"));
- goto esp_handle_done;
- case ESP_STATP:
- /* Status phase. */
- SCptr->SCp.phase = in_status;
- eregs->esp_cmd = ESP_CMD_ICCSEQ;
- ETRACE(("STATUS\n"));
- goto esp_handle_done; /* Wait for message. */
- };
- };
- } else if(esp->ireg & ESP_INTR_FDONE) {
- /* I'd like to investigate why this happens... */
- ESPLOG(("esp: This is weird, halfway through "));
- ESPLOG(("selection, trying to continue anyways.\n"));
- goto esp_handle_done;
- } else {
- panic("esp: Did not get bus service during selection.");
- goto esp_handle_done;
- }
- panic("esp: Mr. Potatoe Head is on the loose!");
+static inline int fcount(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs)
+{
+ if(esp->erev == fashme)
+ return esp->hme_fifo_workaround_count;
+ else
+ return eregs->esp_fflags & ESP_FF_FBYTES;
+}
- case in_datain:
- /* Drain the fifo for writes to memory. */
- switch(esp->dma->revision) {
- case dvmarev0:
- case dvmarev1:
- case dvmarevplus:
- case dvmarev2:
- case dvmarev3:
- /* Force a drain. */
- dregs->cond_reg |= DMA_FIFO_STDRAIN;
+static inline int fnzero(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs)
+{
+ if(esp->erev == fashme)
+ return 0;
+ else
+ return eregs->esp_fflags & ESP_FF_ONOTZERO;
+}
- /* fall through */
- case dvmaesc1:
- /* Wait for the fifo to drain completely. */
- while(dregs->cond_reg & DMA_FIFO_ISDRAIN)
- barrier();
+/* XXX speculative nops unnecessary when continuing amidst a data phase
+ * XXX even on esp100!!! another case of flooding the bus with I/O reg
+ * XXX writes...
+ */
+static inline void esp_maybe_nop(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs)
+{
+ if(esp->erev == esp100)
+ esp_cmd(esp, eregs, ESP_CMD_NULL);
+}
+
+static inline int sreg_to_dataphase(unchar sreg)
+{
+ if((sreg & ESP_STAT_PMASK) == ESP_DOP)
+ return in_dataout;
+ else
+ return in_datain;
+}
+
+/* The ESP100 when in synchronous data phase, can mistake a long final
+ * REQ pulse from the target as an extra byte, it places whatever is on
+ * the data lines into the fifo. For now, we will assume when this
+ * happens that the target is a bit quirky and we don't want to
+ * be talking synchronously to it anyways. Regardless, we need to
+ * tell the ESP to eat the extraneous byte so that we can proceed
+ * to the next phase.
+ */
+static inline int esp100_sync_hwbug(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ Scsi_Cmnd *sp, int fifocnt)
+{
+ /* Do not touch this piece of code. */
+ if((!(esp->erev == esp100)) ||
+ (!(sreg_datainp((esp->sreg = eregs->esp_status)) && !fifocnt) &&
+ !(sreg_dataoutp(esp->sreg) && !fnzero(esp, eregs)))) {
+ if(sp->SCp.phase == in_dataout)
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ return 0;
+ } else {
+ /* Async mode for this guy. */
+ build_sync_nego_msg(esp, 0, 0);
+
+ /* Ack the bogus byte, but set ATN first. */
+ esp_cmd(esp, eregs, ESP_CMD_SATN);
+ esp_cmd(esp, eregs, ESP_CMD_MOK);
+ return 1;
+ }
+}
+
+/* This closes the window during a selection with a reselect pending, because
+ * we use DMA for the selection process the FIFO should hold the correct
+ * contents if we get reselected during this process. So we just need to
+ * ack the possible illegal cmd interrupt pending on the esp100.
+ */
+static inline int esp100_reconnect_hwbug(struct Sparc_ESP *esp,
+ struct Sparc_ESP_regs *eregs)
+{
+ volatile unchar junk;
+
+ if(esp->erev != esp100)
+ return 0;
+ junk = eregs->esp_intrpt;
+ if(junk & ESP_INTR_SR)
+ return 1;
+ return 0;
+}
+
+/* This verifies the BUSID bits during a reselection so that we know which
+ * target is talking to us.
+ */
+static inline int reconnect_target(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs)
+{
+ int it, me = esp->scsi_id_mask, targ = 0;
+
+ if(2 != fcount(esp, eregs))
+ return -1;
+ if(esp->erev == fashme) {
+ /* HME does not latch it's own BUS ID bits during
+ * a reselection. Also the target number is given
+ * as an unsigned char, not as a sole bit number
+ * like the other ESP's do.
+ * Happy Meal indeed....
+ */
+ targ = esp->hme_fifo_workaround_buffer[0];
+ } else {
+ it = eregs->esp_fdata;
+ if(!(it & me))
+ return -1;
+ it &= ~me;
+ if(it & (it - 1))
+ return -1;
+ while(!(it & 1))
+ targ++, it >>= 1;
+ }
+ return targ;
+}
+
+/* This verifies the identify from the target so that we know which lun is
+ * being reconnected.
+ */
+static inline int reconnect_lun(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs)
+{
+ int lun;
+
+ if((esp->sreg & ESP_STAT_PMASK) != ESP_MIP)
+ return -1;
+ if(esp->erev == fashme)
+ lun = esp->hme_fifo_workaround_buffer[1];
+ else
+ lun = eregs->esp_fdata;
+ if(esp->sreg & ESP_STAT_PERR)
+ return 0;
+ if((lun & 0x40) || !(lun & 0x80))
+ return -1;
+ return lun & 7;
+}
+
+/* This puts the driver in a state where it can revitalize a command that
+ * is being continued due to reselection.
+ */
+static inline void esp_connect(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ Scsi_Cmnd *sp)
+{
+ Scsi_Device *dp = sp->device;
+ eregs->esp_soff = dp->sync_max_offset;
+ eregs->esp_stp = dp->sync_min_period;
+ if(esp->erev > esp100a)
+ eregs->esp_cfg3 = esp->config3[sp->target];
+ if(esp->erev == fashme)
+ eregs->esp_busid = (sp->target & 0xf) |
+ (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT);
+ esp->current_SC = sp;
+}
+
+/* This will place the current working command back into the issue queue
+ * if we are to receive a reselection amidst a selection attempt.
+ */
+static inline void esp_reconnect(struct Sparc_ESP *esp, Scsi_Cmnd *sp)
+{
+ if(!esp->disconnected_SC)
+ printk("esp%d: Weird, being reselected but disconnected "
+ "command queue is empty.\n", esp->esp_id);
+ esp->snip = 0;
+ esp->current_SC = 0;
+ sp->SCp.phase = not_issued;
+ append_SC(&esp->issue_SC, sp);
+}
+
+/* Begin message in phase. */
+static inline int esp_do_msgin(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ /* Must be very careful with the fifo on the HME */
+ if((esp->erev != fashme) || !(eregs->esp_status2 & ESP_STAT2_FEMPTY))
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ esp_maybe_nop(esp, eregs);
+ esp_cmd(esp, eregs, ESP_CMD_TI);
+ esp->msgin_len = 1;
+ esp->msgin_ctr = 0;
+ esp_advance_phase(esp->current_SC, in_msgindone);
+ return do_work_bus;
+}
+
+/* This uses various DMA csr fields and the fifo flags count value to
+ * determine how many bytes were successfully sent/received by the ESP.
+ */
+static inline int esp_bytes_sent(struct Sparc_ESP *esp,
+ struct sparc_dma_registers *dregs,
+ int fifo_count)
+{
+ int rval = (((unsigned long)dregs->st_addr) -
+ ((unsigned long)esp->esp_command));
+
+ if(esp->dma->revision == dvmarev1)
+ rval -= (4 - ((dregs->cond_reg & DMA_READ_AHEAD)>>11));
+ return rval - fifo_count;
+}
+
+static inline void advance_sg(Scsi_Cmnd *sp)
+{
+ ++sp->SCp.buffer;
+ --sp->SCp.buffers_residual;
+ sp->SCp.this_residual = sp->SCp.buffer->length;
+ sp->SCp.ptr = sp->SCp.buffer->dvma_address;
+}
+
+/* Complete a command, this is the only way to safely finish
+ * a command with disconnected commands or a reset interrupt
+ * pending because scsi_done() can enable interrupts full blast.
+ */
+static inline void safe_esp_done(struct Sparc_ESP *esp,
+ struct sparc_dma_registers *dregs,
+ int error)
+{
+ int before = 0;
+
+ if(dregs->cond_reg & DMA_INT_ENAB) {
+ before = 1;
+ DMA_INTSOFF(dregs);
+ }
+ esp_done(esp, error);
+ if(before)
+ DMA_INTSON(dregs);
+}
+
+/* Please note that the way I've coded these routines is that I _always_
+ * check for a disconnect during any and all information transfer
+ * phases. The SCSI standard states that the target _can_ cause a BUS
+ * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
+ * that during information transfer phases the target controls every
+ * change in phase, the only thing the initiator can do is "ask" for
+ * a message out phase by driving ATN true. The target can, and sometimes
+ * will, completely ignore this request so we cannot assume anything when
+ * we try to force a message out phase to abort/reset a target. Most of
+ * the time the target will eventually be nice and go to message out, so
+ * we may have to hold on to our state about what we want to tell the target
+ * for some period of time.
+ */
+
+/* I think I have things working here correctly. Even partial transfers
+ * within a buffer or sub-buffer should not upset us at all no matter
+ * how bad the target and/or ESP fucks things up.
+ */
+static inline int esp_do_data(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+ int thisphase, hmuch;
+
+ ESPDATA(("esp_do_data: "));
+ esp_maybe_nop(esp, eregs);
+ thisphase = sreg_to_dataphase(esp->sreg);
+ esp_advance_phase(SCptr, thisphase);
+ ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT"));
+ hmuch = dma_can_transfer(SCptr, esp->dma->revision);
+ ESPDATA(("hmuch<%d> ", hmuch));
+ esp->current_transfer_size = hmuch;
+ if(esp->erev == fashme) {
+ unsigned long tmp = dregs->cond_reg;
+
+ /* Touchy chip, this stupid HME scsi adapter... */
+ esp_setcount(eregs, hmuch, 1);
+ esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
+ dregs->cnt = hmuch;
+ tmp |= (DMA_SCSI_DISAB | DMA_ENABLE);
+ if(thisphase == in_datain)
+ tmp |= DMA_ST_WRITE;
+ else
+ tmp &= ~(DMA_ST_WRITE);
+ dregs->st_addr = SCptr->SCp.ptr;
+ dregs->cond_reg = tmp;
+ } else {
+ esp_setcount(eregs, hmuch, 0);
+ dma_setup(dregs, esp->dma->revision, SCptr->SCp.ptr,
+ hmuch, (thisphase == in_datain));
+ ESPDATA(("DMA|TI --> do_intr_end\n"));
+ esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
+ }
+ return do_intr_end;
+}
+
+/* See how successful the data transfer was. */
+static inline int esp_do_data_finale(struct Sparc_ESP *esp,
+ struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+ int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0;
+
+ ESPDATA(("esp_do_data_finale: "));
+
+ if(SCptr->SCp.phase == in_datain) {
+ if(esp->sreg & ESP_STAT_PERR) {
+ /* Yuck, parity error. The ESP asserts ATN
+ * so that we can go to message out phase
+ * immediately and inform the target that
+ * something bad happened.
+ */
+ ESPLOG(("esp%d: data bad parity detected.\n",
+ esp->esp_id));
+ esp->cur_msgout[0] = INITIATOR_ERROR;
+ esp->msgout_len = 1;
+ }
+ dma_drain(dregs, esp->dma->revision);
+ }
+ dma_invalidate(dregs, esp->dma->revision);
+
+ /* This could happen for the above parity error case. */
+ if(!(esp->ireg == ESP_INTR_BSERV)) {
+ /* Please go to msgout phase, please please please... */
+ ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
+ esp->esp_id));
+ return esp_do_phase_determine(esp, eregs, dregs);
+ }
+
+ /* Check for partial transfers and other horrible events.
+ * Note, here we read the real fifo flags register even
+ * on HME broken adapters because we skip the HME fifo
+ * workaround code in esp_handle() if we are doing data
+ * phase things. We don't want to fuck directly with
+ * the fifo like that, especially if doing syncronous
+ * transfers! Also, will need to double the count on
+ * HME if we are doing wide transfers, as the HME fifo
+ * will move and count 16-bit quantities during wide data.
+ * SMCC _and_ Qlogic can both bite me.
+ */
+ fifocnt = eregs->esp_fflags & ESP_FF_FBYTES;
+ if(esp->erev != fashme)
+ ecount = esp_getcount(eregs);
+ bytes_sent = esp->current_transfer_size;
+
+ /* Uhhh, might not want both of these conditionals to run
+ * at once on HME due to the fifo problems it has. Consider
+ * changing it to:
+ *
+ * if(!(esp->sreg & ESP_STAT_TCNT)) {
+ * bytes_sent -= ecount;
+ * } else if(SCptr->SCp.phase == in_dataout) {
+ * bytes_sent -= fifocnt;
+ * }
+ *
+ * But only for the HME case, leave the current code alone
+ * for all other ESP revisions as we know the existing code
+ * works just fine for them.
+ */
+ ESPDATA(("trans_sz=%d, ", bytes_sent));
+ if(esp->erev == fashme) {
+ if(!(esp->sreg & ESP_STAT_TCNT)) {
+ bytes_sent -= esp_getcount(eregs);
+ } else if(SCptr->SCp.phase == in_dataout) {
+ bytes_sent -= fifocnt;
+ }
+ } else {
+ if(!(esp->sreg & ESP_STAT_TCNT))
+ bytes_sent -= ecount;
+ if(SCptr->SCp.phase == in_dataout)
+ bytes_sent -= fifocnt;
+ }
+
+ ESPDATA(("bytes_sent=%d, ", bytes_sent));
+
+ /* If we were in synchronous mode, check for peculiarities. */
+ if(esp->erev == fashme) {
+ if(SCptr->device->sync_max_offset) {
+ if(SCptr->SCp.phase == in_dataout)
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ } else {
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ }
+ } else {
+ if(SCptr->device->sync_max_offset)
+ bogus_data = esp100_sync_hwbug(esp, eregs, SCptr, fifocnt);
+ else
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ }
+
+ /* Until we are sure of what has happened, we are certainly
+ * in the dark.
+ */
+ esp_advance_phase(SCptr, in_the_dark);
+
+ if(bytes_sent < 0) {
+ /* I've seen this happen due to lost state in this
+ * driver. No idea why it happened, but allowing
+ * this value to be negative caused things to
+ * lock up. This allows greater chance of recovery.
+ */
+ ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id));
+ ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
+ esp->esp_id,
+ esp->current_transfer_size, fifocnt, ecount));
+ ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
+ esp->esp_id,
+ SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual));
+ bytes_sent = 0;
+ }
+
+ /* Update the state of our transfer. */
+ SCptr->SCp.ptr += bytes_sent;
+ SCptr->SCp.this_residual -= bytes_sent;
+ if(SCptr->SCp.this_residual < 0) {
+ /* shit */
+ printk("esp%d: Data transfer overrun.\n", esp->esp_id);
+ SCptr->SCp.this_residual = 0;
+ }
+
+ /* Maybe continue. */
+ if(!bogus_data) {
+ ESPDATA(("!bogus_data, "));
+ /* NO MATTER WHAT, we advance the scatterlist,
+ * if the target should decide to disconnect
+ * in between scatter chunks (which is common)
+ * we could die horribly! I used to have the sg
+ * advance occur only if we are going back into
+ * (or are staying in) a data phase, you can
+ * imagine the hell I went through trying to
+ * figure this out.
+ */
+ if(SCptr->use_sg && !SCptr->SCp.this_residual)
+ advance_sg(SCptr);
+ if(sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) {
+ ESPDATA(("to more data\n"));
+ return esp_do_data(esp, eregs, dregs);
+ }
+ ESPDATA(("to new phase\n"));
+ return esp_do_phase_determine(esp, eregs, dregs);
+ }
+ /* Bogus data, just wait for next interrupt. */
+ ESPLOG(("esp%d: bogus_data during end of data phase\n",
+ esp->esp_id));
+ return do_intr_end;
+}
+
+/* Either a command is completing or a target is dropping off the bus
+ * to continue the command in the background so we can do other work.
+ */
+static inline int esp_do_freebus(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+ int rval;
+
+ rval = skipahead2(esp, eregs, dregs, SCptr, in_status, in_msgindone, in_freeing);
+ if(rval)
+ return rval;
+ if(esp->ireg != ESP_INTR_DC) {
+ ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id));
+ return do_reset_bus; /* target will not drop BSY... */
+ }
+ esp->msgout_len = 0;
+ esp->prevmsgout = NOP;
+ if(esp->prevmsgin == COMMAND_COMPLETE) {
+ /* Normal end of nexus. */
+ if(esp->disconnected_SC || (esp->erev == fashme))
+ esp_cmd(esp, eregs, ESP_CMD_ESEL);
+
+ if(SCptr->SCp.Status != GOOD && SCptr->SCp.Status != CONDITION_GOOD &&
+ ((1<<SCptr->target) & esp->targets_present) &&
+ SCptr->device->sync && SCptr->device->sync_max_offset) {
+ /* SCSI standard says that the synchronous capabilities
+ * should be renegotiated at this point. Most likely
+ * we are about to request sense from this target
+ * in which case we want to avoid using sync
+ * transfers until we are sure of the current target
+ * state.
+ */
+ ESPMISC(("esp: Status <%d> for target %d lun %d\n",
+ SCptr->SCp.Status, SCptr->target, SCptr->lun));
+
+ /* But don't do this when spinning up a disk at
+ * boot time while we poll for completion as it
+ * fills up the console with messages. Also, tapes
+ * can report not ready many times right after
+ * loading up a tape.
+ */
+ if(SCptr->cmnd[0] != START_STOP &&
+ SCptr->data_cmnd[0] != START_STOP &&
+ SCptr->cmnd[0] != TEST_UNIT_READY &&
+ SCptr->data_cmnd[0] != TEST_UNIT_READY &&
+ !(SCptr->device->type == TYPE_TAPE &&
+ (SCptr->cmnd[0] == TEST_UNIT_READY ||
+ SCptr->data_cmnd[0] == TEST_UNIT_READY ||
+ SCptr->cmnd[0] == MODE_SENSE ||
+ SCptr->data_cmnd[0] == MODE_SENSE)))
+ SCptr->device->sync = 0;
+ }
+ ESPDISC(("F<%02x,%02x>", SCptr->target, SCptr->lun));
+ safe_esp_done(esp, dregs, ((SCptr->SCp.Status & 0xff) |
+ ((SCptr->SCp.Message & 0xff)<<8) |
+ (DID_OK << 16)));
+ } else if(esp->prevmsgin == DISCONNECT) {
+ /* Normal disconnect. */
+ esp_cmd(esp, eregs, ESP_CMD_ESEL);
+ ESPDISC(("D<%02x,%02x>", SCptr->target, SCptr->lun));
+ append_SC(&esp->disconnected_SC, SCptr);
+ esp->current_SC = NULL;
+ if(esp->issue_SC)
+ esp_exec_cmd(esp);
+ } else {
+ /* Driver bug, we do not expect a disconnect here
+ * and should not have advanced the state engine
+ * to in_freeing.
+ */
+ ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
+ esp->esp_id));
+ return do_reset_bus;
+ }
+ return do_intr_end;
+}
+
+/* Do the needy when a target tries to reconnect to us. */
+static inline int esp_do_reconnect(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ int lun, target;
+ Scsi_Cmnd *SCptr;
+
+ /* Check for all bogus conditions first. */
+ target = reconnect_target(esp, eregs);
+ if(target < 0) {
+ ESPDISC(("bad bus bits\n"));
+ return do_reset_bus;
+ }
+ lun = reconnect_lun(esp, eregs);
+ if(lun < 0) {
+ ESPDISC(("target=%2x, bad identify msg\n", target));
+ return do_reset_bus;
+ }
+
+ /* Things look ok... */
+ ESPDISC(("R<%02x,%02x>", target, lun));
+
+ /* Must flush both FIFO and the DVMA on HME. */
+ if(esp->erev == fashme) {
+ /* XXX this still doesn't fix the problem... */
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ dma_invalidate(esp->dregs, dvmahme);
+ } else {
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ if(esp100_reconnect_hwbug(esp, eregs))
+ return do_reset_bus;
+ esp_cmd(esp, eregs, ESP_CMD_NULL);
+ }
+
+ SCptr = remove_SC(&esp->disconnected_SC, (unchar) target, (unchar) lun);
+ if(!SCptr) {
+ Scsi_Cmnd *sp;
+
+ ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
+ esp->esp_id));
+ ESPLOG(("QUEUE DUMP\n"));
+ sp = esp->issue_SC;
+ ESPLOG(("esp%d: issue_SC[", esp->esp_id));
+ while(sp) {
+ ESPLOG(("<%02x,%02x>", sp->target, sp->lun));
+ sp = (Scsi_Cmnd *) sp->host_scribble;
+ }
+ ESPLOG(("]\n"));
+ sp = esp->current_SC;
+ ESPLOG(("esp%d: current_SC[", esp->esp_id));
+ while(sp) {
+ ESPLOG(("<%02x,%02x>", sp->target, sp->lun));
+ sp = (Scsi_Cmnd *) sp->host_scribble;
+ }
+ ESPLOG(("]\n"));
+ sp = esp->disconnected_SC;
+ ESPLOG(("esp%d: disconnected_SC[", esp->esp_id));
+ while(sp) {
+ ESPLOG(("<%02x,%02x>", sp->target, sp->lun));
+ sp = (Scsi_Cmnd *) sp->host_scribble;
+ }
+ ESPLOG(("]\n"));
+ return do_reset_bus;
+ }
+ esp_connect(esp, eregs, SCptr);
+ esp_cmd(esp, eregs, ESP_CMD_MOK);
+
+ /* No need for explicit restore pointers operation. */
+ esp->snip = 0;
+ esp_advance_phase(SCptr, in_the_dark);
+ return do_intr_end;
+}
+
+/* End of NEXUS (hopefully), pick up status + message byte then leave if
+ * all goes well.
+ */
+static int esp_do_status(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+ int intr, rval;
+
+ rval = skipahead1(esp, eregs, dregs, SCptr, in_the_dark, in_status);
+ if(rval)
+ return rval;
+ intr = esp->ireg;
+ ESPSTAT(("esp_do_status: "));
+ if(intr != ESP_INTR_DC) {
+ int message_out = 0; /* for parity problems */
+
+ /* Ack the message. */
+ ESPSTAT(("ack msg, "));
+ esp_cmd(esp, eregs, ESP_CMD_MOK);
+
+ if(esp->erev != fashme) {
+ dma_flashclear(dregs, esp->dma->revision);
+
+ /* Wait till the first bits settle. */
+ while(esp->esp_command[0] == 0xff)
+ udelay(1);
+ } else {
+ esp->esp_command[0] = esp->hme_fifo_workaround_buffer[0];
+ esp->esp_command[1] = esp->hme_fifo_workaround_buffer[1];
+ }
+
+ ESPSTAT(("got something, "));
+ /* ESP chimes in with one of
+ *
+ * 1) function done interrupt:
+ * both status and message in bytes
+ * are available
+ *
+ * 2) bus service interrupt:
+ * only status byte was acquired
+ *
+ * 3) Anything else:
+ * can't happen, but we test for it
+ * anyways
+ *
+ * ALSO: If bad parity was detected on either
+ * the status _or_ the message byte then
+ * the ESP has asserted ATN on the bus
+ * and we must therefore wait for the
+ * next phase change.
+ */
+ if(intr & ESP_INTR_FDONE) {
+ /* We got it all, hallejulia. */
+ ESPSTAT(("got both, "));
+ SCptr->SCp.Status = esp->esp_command[0];
+ SCptr->SCp.Message = esp->esp_command[1];
+ esp->prevmsgin = SCptr->SCp.Message;
+ esp->cur_msgin[0] = SCptr->SCp.Message;
+ if(esp->sreg & ESP_STAT_PERR) {
+ /* There was bad parity for the
+ * message byte, the status byte
+ * was ok.
+ */
+ message_out = MSG_PARITY_ERROR;
+ }
+ } else if(intr == ESP_INTR_BSERV) {
+ /* Only got status byte. */
+ ESPLOG(("esp%d: got status only, ", esp->esp_id));
+ if(!(esp->sreg & ESP_STAT_PERR)) {
+ SCptr->SCp.Status = esp->esp_command[0];
+ SCptr->SCp.Message = 0xff;
+ } else {
+ /* The status byte had bad parity.
+ * we leave the scsi_pointer Status
+ * field alone as we set it to a default
+ * of CHECK_CONDITION in esp_queue.
+ */
+ message_out = INITIATOR_ERROR;
+ }
+ } else {
+ /* This shouldn't happen ever. */
+ ESPSTAT(("got bolixed\n"));
+ esp_advance_phase(SCptr, in_the_dark);
+ return esp_do_phase_determine(esp, eregs, dregs);
+ }
+
+ if(!message_out) {
+ ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status,
+ SCptr->SCp.Message));
+ if(SCptr->SCp.Message == COMMAND_COMPLETE) {
+ ESPSTAT(("and was COMMAND_COMPLETE\n"));
+ esp_advance_phase(SCptr, in_freeing);
+ return esp_do_freebus(esp, eregs, dregs);
+ } else {
+ ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
+ esp->esp_id));
+ esp->msgin_len = esp->msgin_ctr = 1;
+ esp_advance_phase(SCptr, in_msgindone);
+ return esp_do_msgindone(esp, eregs, dregs);
+ }
+ } else {
+ /* With luck we'll be able to let the target
+ * know that bad parity happened, it will know
+ * which byte caused the problems and send it
+ * again. For the case where the status byte
+ * receives bad parity, I do not believe most
+ * targets recover very well. We'll see.
+ */
+ ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
+ esp->esp_id, message_out));
+ esp->cur_msgout[0] = message_out;
+ esp->msgout_len = esp->msgout_ctr = 1;
+ esp_advance_phase(SCptr, in_the_dark);
+ return esp_do_phase_determine(esp, eregs, dregs);
+ }
+ } else {
+ /* If we disconnect now, all hell breaks loose. */
+ ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id));
+ esp_advance_phase(SCptr, in_the_dark);
+ return esp_do_phase_determine(esp, eregs, dregs);
+ }
+}
+
+/* The target has control of the bus and we have to see where it has
+ * taken us.
+ */
+static int esp_do_phase_determine(struct Sparc_ESP *esp,
+ struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+
+ ESPPHASE(("esp_do_phase_determine: "));
+ if(!(esp->ireg & ESP_INTR_DC)) {
+ switch(esp->sreg & ESP_STAT_PMASK) {
+ case ESP_DOP:
+ case ESP_DIP:
+ ESPPHASE(("to data phase\n"));
+ return esp_do_data(esp, eregs, dregs);
+
+ case ESP_STATP:
+ /* Whee, status phase, finish up the command. */
+ ESPPHASE(("to status phase\n"));
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ if(esp->erev != fashme) {
+ esp->esp_command[0] = 0xff;
+ esp->esp_command[1] = 0xff;
+ eregs->esp_tclow = 2;
+ eregs->esp_tcmed = 0;
+ dregs->cond_reg |= (DMA_ST_WRITE | DMA_ENABLE);
+ if(esp->dma->revision == dvmaesc1)
+ dregs->cnt = 0x1000;
+ dregs->st_addr = esp->esp_command;
+ esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_ICCSEQ);
+ } else {
+ /* Using DVMA for status/message bytes is
+ * unreliable on HME, nice job QLogic.
+ * Happy Meal indeed....
+ */
+ esp_cmd(esp, eregs, ESP_CMD_ICCSEQ);
+ }
+ esp_advance_phase(SCptr, in_status);
+ return esp_do_status(esp, eregs, dregs);
+
+ case ESP_MOP:
+ ESPPHASE(("to msgout phase\n"));
+ esp_advance_phase(SCptr, in_msgout);
+ return esp_do_msgout(esp, eregs, dregs);
+
+ case ESP_MIP:
+ ESPPHASE(("to msgin phase\n"));
+ esp_advance_phase(SCptr, in_msgin);
+ return esp_do_msgin(esp, eregs, dregs);
+
+ case ESP_CMDP:
+ /* Ugh, we're running a non-standard command the
+ * ESP doesn't understand, one byte at a time.
+ */
+ ESPPHASE(("to cmd phase\n"));
+ esp_advance_phase(SCptr, in_cmdbegin);
+ return esp_do_cmdbegin(esp, eregs, dregs);
+ };
+ } else {
+ Scsi_Device *dp = SCptr->device;
+
+ /* This means real problems if we see this
+ * here. Unless we were actually trying
+ * to force the device to abort/reset.
+ */
+ ESPLOG(("esp%d Disconnect amidst phases, ", esp->esp_id));
+ ESPLOG(("pphase<%s> cphase<%s>, ",
+ phase_string(SCptr->SCp.phase),
+ phase_string(SCptr->SCp.sent_command)));
+ if(esp->disconnected_SC || (esp->erev == fashme))
+ esp_cmd(esp, eregs, ESP_CMD_ESEL);
+
+ switch(esp->cur_msgout[0]) {
+ default:
+ /* We didn't expect this to happen at all. */
+ ESPLOG(("device is bolixed\n"));
+ esp_advance_phase(SCptr, in_tgterror);
+ safe_esp_done(esp, dregs, (DID_ERROR << 16));
+ break;
+
+ case BUS_DEVICE_RESET:
+ ESPLOG(("device reset successful\n"));
+ dp->sync_max_offset = 0;
+ dp->sync_min_period = 0;
+ dp->sync = 0;
+ esp_advance_phase(SCptr, in_resetdev);
+ safe_esp_done(esp, dregs, (DID_RESET << 16));
break;
+
+ case ABORT:
+ ESPLOG(("device abort successful\n"));
+ esp_advance_phase(SCptr, in_abortone);
+ safe_esp_done(esp, dregs, (DID_ABORT << 16));
+ break;
+
};
+ return do_intr_end;
+ }
- case in_dataout:
- dregs->cond_reg &= ~DMA_ENABLE;
+ ESPLOG(("esp%d: to unknown phase\n", esp->esp_id));
+ printk("esp%d: Bizarre bus phase %2x.\n", esp->esp_id,
+ esp->sreg & ESP_STAT_PMASK);
+ return do_reset_bus;
+}
+
+/* First interrupt after exec'ing a cmd comes here. */
+static int esp_select_complete(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+ Scsi_Device *SDptr = SCptr->device;
+ int cmd_bytes_sent, fcnt;
+
+ if(esp->erev != fashme)
+ esp->seqreg = (eregs->esp_sstep & ESP_STEP_VBITS);
+ if(esp->erev == fashme)
+ fcnt = esp->hme_fifo_workaround_count;
+ else
+ fcnt = (eregs->esp_fflags & ESP_FF_FBYTES);
+ cmd_bytes_sent = esp_bytes_sent(esp, dregs, fcnt);
+ dma_invalidate(dregs, esp->dma->revision);
+
+ /* Let's check to see if a reselect happened
+ * while we we're trying to select. This must
+ * be checked first.
+ */
+ if(esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
+ esp_reconnect(esp, SCptr);
+ return esp_do_reconnect(esp, eregs, dregs);
+ }
- /* We may be pipelining an sg-list. */
- if(SCptr->use_sg) {
- if(SCptr->SCp.buffers_residual) {
- /* If we do not see a BUS SERVICE interrupt
- * at this point, or we see that we have left
- * the current data phase, then we lose.
+ /* Looks like things worked, we should see a bus service &
+ * a function complete interrupt at this point. Note we
+ * are doing a direct comparison because we don't want to
+ * be fooled into thinking selection was successful if
+ * ESP_INTR_DC is set, see below.
+ */
+ if(esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
+ /* target speaks... */
+ esp->targets_present |= (1<<SCptr->target);
+
+ /* What if the target ignores the sdtr? */
+ if(esp->snip)
+ SDptr->sync = 1;
+
+ /* See how far, if at all, we got in getting
+ * the information out to the target.
+ */
+ switch(esp->seqreg) {
+ default:
+
+ case ESP_STEP_ASEL:
+ /* Arbitration won, target selected, but
+ * we are in some phase which is not command
+ * phase nor is it message out phase.
+ *
+ * XXX We've confused the target, obviously.
+ * XXX So clear it's state, but we also end
+ * XXX up clearing everyone elses. That isn't
+ * XXX so nice. I'd like to just reset this
+ * XXX target, but if I cannot even get it's
+ * XXX attention and finish selection to talk
+ * XXX to it, there is not much more I can do.
+ * XXX If we have a loaded bus we're going to
+ * XXX spend the next second or so renegotiating
+ * XXX for synchronous transfers.
+ */
+ ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
+ esp->esp_id, SCptr->target));
+
+ case ESP_STEP_SID:
+ /* Arbitration won, target selected, went
+ * to message out phase, sent one message
+ * byte, then we stopped. ATN is asserted
+ * on the SCSI bus and the target is still
+ * there hanging on. This is a legal
+ * sequence step if we gave the ESP a select
+ * and stop command.
+ *
+ * XXX See above, I could set the borken flag
+ * XXX in the device struct and retry the
+ * XXX command. But would that help for
+ * XXX tagged capable targets?
+ */
+
+ case ESP_STEP_NCMD:
+ /* Arbitration won, target selected, maybe
+ * sent the one message byte in message out
+ * phase, but we did not go to command phase
+ * in the end. Actually, we could have sent
+ * only some of the message bytes if we tried
+ * to send out the entire identify and tag
+ * message using ESP_CMD_SA3.
+ */
+ cmd_bytes_sent = 0;
+ break;
+
+ case ESP_STEP_PPC:
+ /* No, not the powerPC pinhead. Arbitration
+ * won, all message bytes sent if we went to
+ * message out phase, went to command phase
+ * but only part of the command was sent.
+ *
+ * XXX I've seen this, but usually in conjunction
+ * XXX with a gross error which appears to have
+ * XXX occurred between the time I told the
+ * XXX ESP to arbitrate and when I got the
+ * XXX interrupt. Could I have misloaded the
+ * XXX command bytes into the fifo? Actually,
+ * XXX I most likely missed a phase, and therefore
+ * XXX went into never never land and didn't even
+ * XXX know it. That was the old driver though.
+ * XXX What is even more peculiar is that the ESP
+ * XXX showed the proper function complete and
+ * XXX bus service bits in the interrupt register.
+ */
+
+ case ESP_STEP_FINI4:
+ case ESP_STEP_FINI5:
+ case ESP_STEP_FINI6:
+ case ESP_STEP_FINI7:
+ /* Account for the identify message */
+ if(SCptr->SCp.phase == in_slct_norm)
+ cmd_bytes_sent -= 1;
+ };
+ if(esp->erev != fashme)
+ esp_cmd(esp, eregs, ESP_CMD_NULL);
+
+ /* Be careful, we could really get fucked during synchronous
+ * data transfers if we try to flush the fifo now.
+ */
+ if((esp->erev != fashme) && /* not a Happy Meal and... */
+ !fcnt && /* Fifo is empty and... */
+ /* either we are not doing synchronous transfers or... */
+ (!SDptr->sync_max_offset ||
+ /* We are not going into data in phase. */
+ ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP)))
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* flush is safe */
+
+ /* See how far we got if this is not a slow command. */
+ if(!esp->esp_slowcmd) {
+ if(cmd_bytes_sent < 0)
+ cmd_bytes_sent = 0;
+ if(cmd_bytes_sent != SCptr->cmd_len) {
+ /* Crapola, mark it as a slowcmd
+ * so that we have some chance of
+ * keeping the command alive with
+ * good luck.
+ *
+ * XXX Actually, if we didn't send it all
+ * XXX this means either we didn't set things
+ * XXX up properly (driver bug) or the target
+ * XXX or the ESP detected parity on one of
+ * XXX the command bytes. This makes much
+ * XXX more sense, and therefore this code
+ * XXX should be changed to send out a
+ * XXX parity error message or if the status
+ * XXX register shows no parity error then
+ * XXX just expect the target to bring the
+ * XXX bus into message in phase so that it
+ * XXX can send us the parity error message.
+ * XXX SCSI sucks...
*/
- if(!(esp->ireg & ESP_INTR_BSERV) ||
- ((esp->sreg & ESP_STAT_PMASK) > 1))
- panic("esp: Aiee penguin on the SCSI-bus.");
-
- ++SCptr->SCp.buffer;
- --SCptr->SCp.buffers_residual;
- SCptr->SCp.this_residual = SCptr->SCp.buffer->length;
- SCptr->SCp.ptr = SCptr->SCp.buffer->alt_address;
+ esp->esp_slowcmd = 1;
+ esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]);
+ esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent);
+ }
+ }
-#ifdef DEBUG_ESP_SG
- printk("<%p,%d> ", SCptr->SCp.ptr,
- SCptr->SCp.this_residual);
-#endif
+ /* Now figure out where we went. */
+ esp_advance_phase(SCptr, in_the_dark);
+ return esp_do_phase_determine(esp, eregs, dregs);
+ }
+
+ /* Did the target even make it? */
+ if(esp->ireg == ESP_INTR_DC) {
+ /* wheee... nobody there or they didn't like
+ * what we told it to do, clean up.
+ */
+
+ /* If anyone is off the bus, but working on
+ * a command in the background for us, tell
+ * the ESP to listen for them.
+ */
+ if(esp->disconnected_SC)
+ esp_cmd(esp, eregs, ESP_CMD_ESEL);
+
+ if(((1<<SCptr->target) & esp->targets_present) &&
+ esp->seqreg && esp->cur_msgout[0] == EXTENDED_MESSAGE &&
+ (SCptr->SCp.phase == in_slct_msg ||
+ SCptr->SCp.phase == in_slct_stop)) {
+ /* shit */
+ esp->snip = 0;
+ printk("esp%d: Failed synchronous negotiation for target %d "
+ "lun %d\n",
+ esp->esp_id, SCptr->target, SCptr->lun);
+ SDptr->sync_max_offset = 0;
+ SDptr->sync_min_period = 0;
+ SDptr->sync = 1; /* so we dont negotiate again */
+
+ /* Run the command again, this time though we
+ * won't try to negotiate for synchronous transfers.
+ *
+ * XXX I'd like to do something like send an
+ * XXX INITIATOR_ERROR or ABORT message to the
+ * XXX target to tell it, "Sorry I confused you,
+ * XXX please come back and I will be nicer next
+ * XXX time". But that requires having the target
+ * XXX on the bus, and it has dropped BSY on us.
+ */
+ esp->current_SC = NULL;
+ esp_advance_phase(SCptr, not_issued);
+ prepend_SC(&esp->issue_SC, SCptr);
+ esp_exec_cmd(esp);
+ return do_intr_end;
+ }
- /* Latch in new esp counters... */
- eregs->esp_tclow = SCptr->SCp.this_residual;
- eregs->esp_tcmed = (SCptr->SCp.this_residual>>8);
- eregs->esp_cmd = (ESP_CMD_DMA | ESP_CMD_NULL);
-
- /* Reload DVMA gate array with new vaddr and enab. */
- dregs->st_addr = SCptr->SCp.ptr;
- dregs->cond_reg |= DMA_ENABLE;
+ /* Ok, this is normal, this is what we see during boot
+ * or whenever when we are scanning the bus for targets.
+ * But first make sure that is really what is happening.
+ */
+ if(((1<<SCptr->target) & esp->targets_present)) {
+ printk("esp%d: Warning, live target %d not responding to "
+ "selection.\n", esp->esp_id, SCptr->target);
+
+ /* This _CAN_ happen. The SCSI standard states that
+ * the target is to _not_ respond to selection if
+ * _it_ detects bad parity on the bus for any reason.
+ * Therefore, we assume that if we've talked successfully
+ * to this target before, bad parity is the problem.
+ */
+ safe_esp_done(esp, dregs, (DID_PARITY << 16));
+ } else {
+ /* Else, there really isn't anyone there. */
+ ESPMISC(("esp: selection failure, maybe nobody there?\n"));
+ ESPMISC(("esp: target %d lun %d\n",
+ SCptr->target, SCptr->lun));
+ safe_esp_done(esp, dregs, (DID_BAD_TARGET << 16));
+ }
+ return do_intr_end;
+ }
- /* Tell the esp to start transferring. */
- eregs->esp_cmd = (ESP_CMD_DMA | ESP_CMD_TI);
- goto esp_handle_done;
+
+ ESPLOG(("esp%d: Selection failure.\n", esp->esp_id));
+ printk("esp%d: Currently -- ", esp->esp_id);
+ esp_print_ireg(esp->ireg);
+ printk(" ");
+ esp_print_statreg(esp->sreg);
+ printk(" ");
+ esp_print_seqreg(esp->seqreg);
+ printk("\n");
+ printk("esp%d: New -- ", esp->esp_id);
+ esp->sreg = eregs->esp_status;
+ esp->seqreg = eregs->esp_sstep;
+ esp->ireg = eregs->esp_intrpt;
+ esp_print_ireg(esp->ireg);
+ printk(" ");
+ esp_print_statreg(esp->sreg);
+ printk(" ");
+ esp_print_seqreg(esp->seqreg);
+ printk("\n");
+ ESPLOG(("esp%d: resetting bus\n", esp->esp_id));
+ return do_reset_bus; /* ugh... */
+}
+
+/* Continue reading bytes for msgin phase. */
+static int esp_do_msgincont(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ if(esp->ireg & ESP_INTR_BSERV) {
+ /* in the right phase too? */
+ if((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) {
+ /* phew... */
+ esp_cmd(esp, eregs, ESP_CMD_TI);
+ esp_advance_phase(esp->current_SC, in_msgindone);
+ return do_intr_end;
+ }
+
+ /* We changed phase but ESP shows bus service,
+ * in this case it is most likely that we, the
+ * hacker who has been up for 20hrs straight
+ * staring at the screen, drowned in coffee
+ * smelling like retched cigarette ashes
+ * have miscoded something..... so, try to
+ * recover as best we can.
+ */
+ printk("esp%d: message in mis-carriage.\n", esp->esp_id);
+ }
+ esp_advance_phase(esp->current_SC, in_the_dark);
+ return do_phase_determine;
+}
+
+static inline int check_singlebyte_msg(struct Sparc_ESP *esp,
+ struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ esp->prevmsgin = esp->cur_msgin[0];
+ if(esp->cur_msgin[0] & 0x80) {
+ /* wheee... */
+ ESPLOG(("esp%d: target sends identify amidst phases\n",
+ esp->esp_id));
+ esp_advance_phase(esp->current_SC, in_the_dark);
+ return 0;
+ } else if(((esp->cur_msgin[0] & 0xf0) == 0x20) ||
+ (esp->cur_msgin[0] == EXTENDED_MESSAGE)) {
+ esp->msgin_len = 2;
+ esp_advance_phase(esp->current_SC, in_msgincont);
+ return 0;
+ }
+ esp_advance_phase(esp->current_SC, in_the_dark);
+ switch(esp->cur_msgin[0]) {
+ default:
+ /* We don't want to hear about it. */
+ ESPLOG(("esp%d: msg %02x which we dont know about\n", esp->esp_id,
+ esp->cur_msgin[0]));
+ return MESSAGE_REJECT;
+
+ case NOP:
+ ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id,
+ esp->current_SC->target));
+ return 0;
+
+ case RESTORE_POINTERS:
+ case SAVE_POINTERS:
+ /* We handle this all automatically. */
+ return 0;
+
+ case COMMAND_COMPLETE:
+ case DISCONNECT:
+ /* Freeing the bus, let it go. */
+ esp->current_SC->SCp.phase = in_freeing;
+ return 0;
+
+ case MESSAGE_REJECT:
+ ESPMISC(("msg reject, "));
+ if(esp->prevmsgout == EXTENDED_MESSAGE) {
+ Scsi_Device *SDptr = esp->current_SC->device;
+
+ /* Doesn't look like this target can
+ * do synchronous or WIDE transfers.
+ */
+ ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
+ SDptr->sync = 1;
+ SDptr->wide = 1;
+ SDptr->sync_min_period = 0;
+ SDptr->sync_max_offset = 0;
+ return 0;
+ } else {
+ ESPMISC(("not sync nego, sending ABORT\n"));
+ return ABORT;
+ }
+ };
+}
+
+/* Target negotiates for synchronous transfers before we do, this
+ * is legal although very strange. What is even funnier is that
+ * the SCSI2 standard specifically recommends against targets doing
+ * this because so many initiators cannot cope with this occuring.
+ */
+static inline int target_with_ants_in_pants(struct Sparc_ESP *esp,
+ Scsi_Cmnd *SCptr,
+ Scsi_Device *SDptr)
+{
+ if(SDptr->sync || SDptr->borken) {
+ /* sorry, no can do */
+ ESPSDTR(("forcing to async, "));
+ build_sync_nego_msg(esp, 0, 0);
+ SDptr->sync = 1;
+ esp->snip = 1;
+ ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id));
+ esp_advance_phase(SCptr, in_the_dark);
+ return EXTENDED_MESSAGE;
+ }
+
+ /* Ok, we'll check them out... */
+ return 0;
+}
+
+static inline void sync_report(struct Sparc_ESP *esp)
+{
+ int msg3, msg4;
+ char *type;
+
+ msg3 = esp->cur_msgin[3];
+ msg4 = esp->cur_msgin[4];
+ if(msg4) {
+ int hz = 1000000000 / (msg3 * 4);
+ int integer = hz / 1000000;
+ int fraction = (hz - (integer * 1000000)) / 10000;
+ if((esp->erev == fashme) &&
+ (esp->config3[esp->current_SC->target] & ESP_CONFIG3_EWIDE)) {
+ type = "FAST-WIDE";
+ integer <<= 1;
+ fraction <<= 1;
+ } else if((msg3 * 4) < 200) {
+ type = "FAST";
+ } else {
+ type = "synchronous";
+ }
+ printk(KERN_INFO "esp%d: target %d [period %dns offset %d %d.%02dMHz %s SCSI%s]\n",
+ esp->esp_id, esp->current_SC->target,
+ (int) msg3 * 4,
+ (int) msg4,
+ integer, fraction, type,
+ (((msg3 * 4) < 200) ? "-II" : ""));
+ } else {
+ printk(KERN_INFO "esp%d: target %d asynchronous\n",
+ esp->esp_id, esp->current_SC->target);
+ }
+}
+
+static inline int check_multibyte_msg(struct Sparc_ESP *esp,
+ struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+ Scsi_Device *SDptr = SCptr->device;
+ unchar regval = 0;
+ int message_out = 0;
+
+ ESPSDTR(("chk multibyte msg: "));
+ if(esp->cur_msgin[2] == EXTENDED_SDTR) {
+ int period = esp->cur_msgin[3];
+ int offset = esp->cur_msgin[4];
+
+ ESPSDTR(("is sync nego response, "));
+ if(!esp->snip) {
+ int rval;
+
+ /* Target negotiates first! */
+ ESPSDTR(("target jumps the gun, "));
+ message_out = EXTENDED_MESSAGE; /* we must respond */
+ rval = target_with_ants_in_pants(esp, SCptr, SDptr);
+ if(rval)
+ return rval;
+ }
+
+ ESPSDTR(("examining sdtr, "));
+
+ /* Offset cannot be larger than ESP fifo size. */
+ if(offset > 15) {
+ ESPSDTR(("offset too big %2x, ", offset));
+ offset = 15;
+ ESPSDTR(("sending back new offset\n"));
+ build_sync_nego_msg(esp, period, offset);
+ return EXTENDED_MESSAGE;
+ }
+
+ if(offset && period > esp->max_period) {
+ /* Yeee, async for this slow device. */
+ ESPSDTR(("period too long %2x, ", period));
+ build_sync_nego_msg(esp, 0, 0);
+ ESPSDTR(("hoping for msgout\n"));
+ esp_advance_phase(esp->current_SC, in_the_dark);
+ return EXTENDED_MESSAGE;
+ } else if (offset && period < esp->min_period) {
+ ESPSDTR(("period too short %2x, ", period));
+ period = esp->min_period;
+ if(esp->erev > esp236)
+ regval = 4;
+ else
+ regval = 5;
+ } else if(offset) {
+ int tmp;
+
+ ESPSDTR(("period is ok, "));
+ tmp = esp->ccycle / 1000;
+ regval = (((period << 2) + tmp - 1) / tmp);
+ if(regval && ((esp->erev == fas100a ||
+ esp->erev == fas236 ||
+ esp->erev == fashme))) {
+ if(period >= 50)
+ regval--;
}
-#ifdef DEBUG_ESP_SG
- printk("done.\n");
-#endif
}
- /* Take a look at what happened. */
- if(esp->ireg & ESP_INTR_DC) {
- panic("esp: target disconnects during data transfer.");
- goto esp_handle_done;
- } else if(esp->ireg & ESP_INTR_BSERV) {
- if((esp->sreg & ESP_STAT_PMASK) != ESP_STATP) {
- panic("esp: Not status phase after data phase.");
- goto esp_handle_done;
+
+ if(offset) {
+ unchar bit;
+
+ SDptr->sync_min_period = (regval & 0x1f);
+ SDptr->sync_max_offset = (offset | esp->radelay);
+ if((esp->erev == fas100a || esp->erev == fas236 || esp->erev == fashme)) {
+ if((esp->erev == fas100a) || (esp->erev == fashme))
+ bit = ESP_CONFIG3_FAST;
+ else
+ bit = ESP_CONFIG3_FSCSI;
+ if(period < 50)
+ esp->config3[SCptr->target] |= bit;
+ else
+ esp->config3[SCptr->target] &= ~bit;
+ eregs->esp_cfg3 = esp->config3[SCptr->target];
}
- SCptr->SCp.phase = in_status;
- eregs->esp_cmd = ESP_CMD_ICCSEQ;
- ETRACE(("STATUS\n"));
- goto esp_handle_done; /* Wait for message. */
- } else {
- printk("esp: did not get bus service after data transfer.");
- printk("esp_status: intr<%2x> stat<%2x> seq<%2x>\n",
- esp->ireg, esp->sreg, esp->seqreg);
- panic("esp: penguin data transfer.");
- goto esp_handle_done;
+ eregs->esp_soff = SDptr->sync_min_period;
+ eregs->esp_stp = SDptr->sync_max_offset;
+
+ ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
+ SDptr->sync_max_offset,
+ SDptr->sync_min_period,
+ esp->config3[SCptr->target]));
+
+ esp->snip = 0;
+ } else if(SDptr->sync_max_offset) {
+ unchar bit;
+
+ /* back to async mode */
+ ESPSDTR(("unaccaptable sync nego, forcing async\n"));
+ SDptr->sync_max_offset = 0;
+ SDptr->sync_min_period = 0;
+ eregs->esp_soff = 0;
+ eregs->esp_stp = 0;
+ if((esp->erev == fas100a || esp->erev == fas236 || esp->erev == fashme)) {
+ if((esp->erev == fas100a) || (esp->erev == fashme))
+ bit = ESP_CONFIG3_FAST;
+ else
+ bit = ESP_CONFIG3_FSCSI;
+ esp->config3[SCptr->target] &= ~bit;
+ eregs->esp_cfg3 = esp->config3[SCptr->target];
+ }
+ }
+
+ sync_report(esp);
+
+ ESPSDTR(("chk multibyte msg: sync is known, "));
+ SDptr->sync = 1;
+
+ if(message_out) {
+ ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
+ esp->esp_id));
+ build_sync_nego_msg(esp, period, offset);
+ esp_advance_phase(SCptr, in_the_dark);
+ return EXTENDED_MESSAGE;
+ }
+
+ ESPSDTR(("returning zero\n"));
+ esp_advance_phase(SCptr, in_the_dark); /* ...or else! */
+ return 0;
+ } else if(esp->cur_msgin[2] == EXTENDED_WDTR) {
+ int size = 8 << esp->cur_msgin[3];
+
+ esp->wnip = 0;
+ if(esp->erev != fashme) {
+ printk("esp%d: AIEEE wide msg received and not HME.\n",
+ esp->esp_id);
+ message_out = MESSAGE_REJECT;
+ } else if(size > 16) {
+ printk("esp%d: AIEEE wide transfer for %d size not supported.\n",
+ esp->esp_id, size);
+ message_out = MESSAGE_REJECT;
+ } else {
+ /* Things look good, lets see what we got. */
+ if(size == 16) {
+ /* Set config 3 register for this target. */
+ printk("esp%d: 16 byte WIDE transfers enabled for target %d.\n",
+ esp->esp_id, SCptr->target);
+ esp->config3[SCptr->target] |= ESP_CONFIG3_EWIDE;
+ } else {
+ /* Just make sure it was one byte sized. */
+ if(size != 8) {
+ printk("esp%d: Aieee, wide nego of %d size.\n",
+ esp->esp_id, size);
+ message_out = MESSAGE_REJECT;
+ goto finish;
+ }
+ /* Pure paranoia. */
+ esp->config3[SCptr->target] &= ~(ESP_CONFIG3_EWIDE);
+ }
+ eregs->esp_cfg3 = esp->config3[SCptr->target];
+
+ /* Regardless, next try for sync transfers. */
+ build_sync_nego_msg(esp, esp->sync_defp, 15);
+ SDptr->sync = 1;
+ esp->snip = 1;
+ message_out = EXTENDED_MESSAGE;
+ }
+ } else if(esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) {
+ ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id));
+ message_out = MESSAGE_REJECT;
+ }
+finish:
+ esp_advance_phase(SCptr, in_the_dark);
+ return message_out;
+}
+
+static int esp_do_msgindone(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+ int message_out = 0, it = 0, rval;
+
+ rval = skipahead1(esp, eregs, dregs, SCptr, in_msgin, in_msgindone);
+ if(rval)
+ return rval;
+ if(SCptr->SCp.sent_command != in_status) {
+ if(!(esp->ireg & ESP_INTR_DC)) {
+ if(esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) {
+ message_out = MSG_PARITY_ERROR;
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ } else if(esp->erev != fashme &&
+ (it = (eregs->esp_fflags & ESP_FF_FBYTES))!=1) {
+ /* We certainly dropped the ball somewhere. */
+ message_out = INITIATOR_ERROR;
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ } else if(!esp->msgin_len) {
+ if(esp->erev == fashme)
+ it = esp->hme_fifo_workaround_buffer[0];
+ else
+ it = eregs->esp_fdata;
+ esp_advance_phase(SCptr, in_msgincont);
+ } else {
+ /* it is ok and we want it */
+ if(esp->erev == fashme)
+ it = esp->cur_msgin[esp->msgin_ctr] =
+ esp->hme_fifo_workaround_buffer[0];
+ else
+ it = esp->cur_msgin[esp->msgin_ctr] =
+ eregs->esp_fdata;
+ esp->msgin_ctr++;
+ }
+ } else {
+ esp_advance_phase(SCptr, in_the_dark);
+ return do_work_bus;
+ }
+ } else {
+ it = esp->cur_msgin[0];
+ }
+ if(!message_out && esp->msgin_len) {
+ if(esp->msgin_ctr < esp->msgin_len) {
+ esp_advance_phase(SCptr, in_msgincont);
+ } else if(esp->msgin_len == 1) {
+ message_out = check_singlebyte_msg(esp, eregs, dregs);
+ } else if(esp->msgin_len == 2) {
+ if(esp->cur_msgin[0] == EXTENDED_MESSAGE) {
+ if((it+2) >= 15) {
+ message_out = MESSAGE_REJECT;
+ } else {
+ esp->msgin_len = (it + 2);
+ esp_advance_phase(SCptr, in_msgincont);
+ }
+ } else {
+ message_out = MESSAGE_REJECT; /* foo on you */
+ }
+ } else {
+ message_out = check_multibyte_msg(esp, eregs, dregs);
+ }
+ }
+ if(message_out < 0) {
+ return -message_out;
+ } else if(message_out) {
+ if(((message_out != 1) &&
+ ((message_out < 0x20) || (message_out & 0x80))))
+ esp->msgout_len = 1;
+ esp->cur_msgout[0] = message_out;
+ esp_cmd(esp, eregs, ESP_CMD_SATN);
+ esp_advance_phase(SCptr, in_the_dark);
+ esp->msgin_len = 0;
+ }
+ esp->sreg = eregs->esp_status;
+ esp->sreg &= ~(ESP_STAT_INTR);
+ if((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD))
+ esp_cmd(esp, eregs, ESP_CMD_MOK);
+ if((SCptr->SCp.sent_command == in_msgindone) &&
+ (SCptr->SCp.phase == in_freeing))
+ return esp_do_freebus(esp, eregs, dregs);
+ return do_intr_end;
+}
+
+static int esp_do_cmdbegin(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+
+ esp_advance_phase(SCptr, in_cmdend);
+ if(esp->erev == fashme) {
+ unsigned long tmp = dregs->cond_reg;
+ int i;
+
+ for(i = 0; i < esp->esp_scmdleft; i++)
+ esp->esp_command[i] = *esp->esp_scmdp++;
+ esp->esp_scmdleft = 0;
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ esp_setcount(eregs, i, 1);
+ esp_cmd(esp, eregs, (ESP_CMD_DMA | ESP_CMD_TI));
+ tmp |= (DMA_SCSI_DISAB | DMA_ENABLE);
+ tmp &= ~(DMA_ST_WRITE);
+ dregs->cnt = i;
+ dregs->st_addr = &esp->esp_command[0];
+ dregs->cond_reg = tmp;
+ } else {
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ eregs->esp_fdata = *esp->esp_scmdp++;
+ esp->esp_scmdleft--;
+ esp_cmd(esp, eregs, ESP_CMD_TI);
+ }
+ return do_intr_end;
+}
+
+static inline int esp_do_cmddone(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ if(esp->erev == fashme)
+ dma_invalidate(dregs, dvmahme);
+ else
+ esp_cmd(esp, eregs, ESP_CMD_NULL);
+ if(esp->ireg & ESP_INTR_BSERV) {
+ esp_advance_phase(esp->current_SC, in_the_dark);
+ return esp_do_phase_determine(esp, eregs, dregs);
+ }
+ ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
+ esp->esp_id));
+ return do_reset_bus;
+}
+
+static int esp_do_msgout(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ switch(esp->msgout_len) {
+ case 1:
+ if(esp->erev == fashme)
+ hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 1);
+ else
+ eregs->esp_fdata = esp->cur_msgout[0];
+ esp_cmd(esp, eregs, ESP_CMD_TI);
+ break;
+
+ case 2:
+ esp->esp_command[0] = esp->cur_msgout[0];
+ esp->esp_command[1] = esp->cur_msgout[1];
+ if(esp->erev == fashme) {
+ hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 2);
+ esp_cmd(esp, eregs, ESP_CMD_TI);
+ } else {
+ dma_setup(dregs, esp->dma->revision,
+ (char *) esp->esp_command, 2, 0);
+ esp_setcount(eregs, 2, 0);
+ esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
+ }
+ break;
+
+ case 4:
+ esp->esp_command[0] = esp->cur_msgout[0];
+ esp->esp_command[1] = esp->cur_msgout[1];
+ esp->esp_command[2] = esp->cur_msgout[2];
+ esp->esp_command[3] = esp->cur_msgout[3];
+ esp->snip = 1;
+ if(esp->erev == fashme) {
+ hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 4);
+ esp_cmd(esp, eregs, ESP_CMD_TI);
+ } else {
+ dma_setup(dregs, esp->dma->revision,
+ (char *) esp->esp_command, 4, 0);
+ esp_setcount(eregs, 4, 0);
+ esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
}
+ break;
+
+ case 5:
+ esp->esp_command[0] = esp->cur_msgout[0];
+ esp->esp_command[1] = esp->cur_msgout[1];
+ esp->esp_command[2] = esp->cur_msgout[2];
+ esp->esp_command[3] = esp->cur_msgout[3];
+ esp->esp_command[4] = esp->cur_msgout[4];
+ esp->snip = 1;
+ if(esp->erev == fashme) {
+ hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 5);
+ esp_cmd(esp, eregs, ESP_CMD_TI);
+ } else {
+ dma_setup(dregs, esp->dma->revision,
+ (char *) esp->esp_command, 5, 0);
+ esp_setcount(eregs, 5, 0);
+ esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
+ }
+ break;
+
+ default:
+ /* whoops */
+ ESPMISC(("bogus msgout sending NOP\n"));
+ esp->cur_msgout[0] = NOP;
+ if(esp->erev == fashme) {
+ hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 1);
+ } else {
+ eregs->esp_fdata = esp->cur_msgout[0];
+ }
+ esp->msgout_len = 1;
+ esp_cmd(esp, eregs, ESP_CMD_TI);
+ break;
+ }
+ esp_advance_phase(esp->current_SC, in_msgoutdone);
+ return do_intr_end;
+}
+
+static inline int esp_do_msgoutdone(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ if(esp->msgout_len > 1) {
+ /* XXX HME/FAS ATN deassert workaround required,
+ * XXX no DMA flushing, only possible ESP_CMD_FLUSH
+ * XXX to kill the fifo.
+ */
+ if(esp->erev != fashme) {
+ while(dregs->cond_reg & DMA_PEND_READ)
+ udelay(1);
+ dregs->cond_reg &= ~(DMA_ENABLE);
+ dma_invalidate(dregs, esp->dma->revision);
+ } else {
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ }
+ }
+ if(!(esp->ireg & ESP_INTR_DC)) {
+ if(esp->erev != fashme)
+ esp_cmd(esp, eregs, ESP_CMD_NULL);
+ switch(esp->sreg & ESP_STAT_PMASK) {
+ case ESP_MOP:
+ /* whoops, parity error */
+ ESPLOG(("esp%d: still in msgout, parity error assumed\n",
+ esp->esp_id));
+ if(esp->msgout_len > 1)
+ esp_cmd(esp, eregs, ESP_CMD_SATN);
+ esp_advance_phase(esp->current_SC, in_msgout);
+ return do_work_bus;
+
+ case ESP_DIP:
+ break;
+
+ default:
+ /* Happy Meal fifo is touchy... */
+ if((esp->erev != fashme) &&
+ !fcount(esp, eregs) &&
+ !(esp->current_SC->device->sync_max_offset))
+ esp_cmd(esp, eregs, ESP_CMD_FLUSH);
+ break;
+
+ };
+ } else {
+ ESPLOG(("esp%d: disconnect, resetting bus\n", esp->esp_id));
+ return do_reset_bus;
+ }
+
+ /* If we sent out a synchronous negotiation message, update
+ * our state.
+ */
+ if(esp->cur_msgout[2] == EXTENDED_MESSAGE &&
+ esp->cur_msgout[4] == EXTENDED_SDTR) {
+ esp->snip = 1; /* anal retentiveness... */
+ }
+
+ esp->prevmsgout = esp->cur_msgout[0];
+ esp->msgout_len = 0;
+ esp_advance_phase(esp->current_SC, in_the_dark);
+ return esp_do_phase_determine(esp, eregs, dregs);
+}
+
+/* This is the second tier in our dual-level SCSI state machine. */
+static inline int esp_work_bus(struct Sparc_ESP *esp, struct Sparc_ESP_regs *eregs,
+ struct sparc_dma_registers *dregs)
+{
+ Scsi_Cmnd *SCptr = esp->current_SC;
+
+ ESPBUS(("esp_work_bus: "));
+ if(!SCptr) {
+ ESPBUS(("reconnect\n"));
+ return esp_do_reconnect(esp, eregs, dregs);
+ }
+
+ switch(SCptr->SCp.phase) {
+ case in_the_dark:
+ ESPBUS(("in the dark\n"));
+ return esp_do_phase_determine(esp, eregs, dregs);
+
+ case in_slct_norm:
+ case in_slct_stop:
+ case in_slct_msg:
+ case in_slct_tag:
+ case in_slct_sneg:
+ ESPBUS(("finish selection\n"));
+ return esp_select_complete(esp, eregs, dregs);
+
+ case in_datain:
+ case in_dataout:
+ ESPBUS(("finish data\n"));
+ return esp_do_data_finale(esp, eregs, dregs);
+
+ case in_msgout:
+ ESPBUS(("message out "));
+ return esp_do_msgout(esp, eregs, dregs);
+
+ case in_msgoutdone:
+ ESPBUS(("finish message out "));
+ return esp_do_msgoutdone(esp, eregs, dregs);
+
+ case in_msgin:
+ ESPBUS(("message in "));
+ return esp_do_msgin(esp, eregs, dregs);
+
+ case in_msgincont:
+ ESPBUS(("continue message in "));
+ return esp_do_msgincont(esp, eregs, dregs);
+
+ case in_msgindone:
+ ESPBUS(("finish message in "));
+ return esp_do_msgindone(esp, eregs, dregs);
+
case in_status:
- if(esp->ireg & ESP_INTR_DC) {
- panic("esp: penguin disconnects in status phase.");
- goto esp_handle_done;
- } else if (esp->ireg & ESP_INTR_FDONE) {
- /* Status and Message now sit in the fifo for us. */
- last_fflags = eregs->esp_fflags;
- SCptr->SCp.phase = in_finale;
- last_status = SCptr->SCp.Status = eregs->esp_fdata;
- last_msg = SCptr->SCp.Message = eregs->esp_fdata;
- eregs->esp_cmd = ESP_CMD_MOK;
- ETRACE(("FINALE\n"));
- goto esp_handle_done;
+ ESPBUS(("status phase "));
+ return esp_do_status(esp, eregs, dregs);
+
+ case in_freeing:
+ ESPBUS(("freeing the bus "));
+ return esp_do_freebus(esp, eregs, dregs);
+
+ case in_cmdbegin:
+ ESPBUS(("begin slow cmd "));
+ return esp_do_cmdbegin(esp, eregs, dregs);
+
+ case in_cmdend:
+ ESPBUS(("end slow cmd "));
+ return esp_do_cmddone(esp, eregs, dregs);
+
+ default:
+ printk("esp%d: command in weird state %2x\n",
+ esp->esp_id, esp->current_SC->SCp.phase);
+ return do_reset_bus;
+ };
+}
+
+/* Main interrupt handler for an esp adapter. */
+static inline void esp_handle(struct Sparc_ESP *esp)
+{
+ struct sparc_dma_registers *dregs;
+ struct Sparc_ESP_regs *eregs;
+ Scsi_Cmnd *SCptr;
+ int what_next = do_intr_end;
+
+ eregs = esp->eregs;
+ dregs = esp->dregs;
+ SCptr = esp->current_SC;
+
+ DMA_IRQ_ENTRY(esp->dma, dregs);
+
+ /* Check for errors. */
+ esp->sreg = eregs->esp_status;
+ esp->sreg &= (~ESP_STAT_INTR);
+ if(esp->erev == fashme) {
+ esp->sreg2 = eregs->esp_status2;
+ esp->seqreg = (eregs->esp_sstep & ESP_STEP_VBITS);
+ }
+ if(esp->sreg & (ESP_STAT_SPAM)) {
+ /* Gross error, could be due to one of:
+ *
+ * - top of fifo overwritten, could be because
+ * we tried to do a synchronous transfer with
+ * an offset greater than ESP fifo size
+ *
+ * - top of command register overwritten
+ *
+ * - DMA setup to go in one direction, SCSI
+ * bus points in the other, whoops
+ *
+ * - weird phase change during asynchronous
+ * data phase while we are initiator
+ */
+ ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg));
+
+ /* If a command is live on the bus we cannot safely
+ * reset the bus, so we'll just let the pieces fall
+ * where they may. Here we are hoping that the
+ * target will be able to cleanly go away soon
+ * so we can safely reset things.
+ */
+ if(!SCptr) {
+ ESPLOG(("esp%d: No current cmd during gross error, "
+ "resetting bus\n", esp->esp_id));
+ what_next = do_reset_bus;
+ goto again;
+ }
+ }
+
+ if(dregs->cond_reg & DMA_HNDL_ERROR) {
+ /* A DMA gate array error. Here we must
+ * be seeing one of two things. Either the
+ * virtual to physical address translation
+ * on the SBUS could not occur, else the
+ * translation it did get pointed to a bogus
+ * page. Ho hum...
+ */
+ ESPLOG(("esp%d: DMA error %08lx\n", esp->esp_id,
+ dregs->cond_reg));
+
+ /* DMA gate array itself must be reset to clear the
+ * error condition.
+ */
+ esp_reset_dma(esp);
+
+ what_next = do_reset_bus;
+ goto again;
+ }
+
+ if(esp->erev == fashme) {
+ /* This chip is really losing. */
+ ESPHME(("HME["));
+
+ ESPHME(("sreg2=%02x,", esp->sreg2));
+ /* Must latch fifo before reading the interrupt
+ * register else garbage ends up in the FIFO
+ * which confuses the driver utterly.
+ */
+ if(!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
+ (esp->sreg2 & ESP_STAT2_F1BYTE)) {
+ ESPHME(("fifo_workaround]"));
+ hme_fifo_hwbug_workaround(esp, eregs);
} else {
- panic("esp: penguin status phase.");
+ ESPHME(("no_fifo_workaround]"));
}
- case in_finale:
- if(esp->ireg & ESP_INTR_BSERV) {
- panic("esp: penguin doesn't disconnect after status msg-ack.");
- goto esp_handle_done;
- } else if(esp->ireg & ESP_INTR_DC) {
- /* Nexus is complete. */
-#ifdef THREADED_ESP_DRIVER
- append_SC(esp->eatme_SC, esp->current_SC);
- esp->current_SC = 0;
- wake_up(esp_kernel_thread);
-#else
- esp_done(esp, ((SCptr->SCp.Status & 0xff) |
- ((SCptr->SCp.Message & 0xff) << 8) |
- (DID_OK << 16)));
-#endif
- ETRACE(("NEXUS_COMPLETE\n"));
- goto esp_handle_done;
+ }
+
+ esp->ireg = eregs->esp_intrpt; /* Unlatch intr and stat regs */
+
+ /* No current cmd is only valid at this point when there are
+ * commands off the bus or we are trying a reset.
+ */
+ if(!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) {
+ /* Panic is safe, since current_SC is null. */
+ ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id));
+ panic("esp_handle: current_SC == penguin within interrupt!");
+ }
+
+ if(esp->ireg & (ESP_INTR_IC)) {
+ /* Illegal command fed to ESP. Outside of obvious
+ * software bugs that could cause this, there is
+ * a condition with esp100 where we can confuse the
+ * ESP into an erroneous illegal command interrupt
+ * because it does not scrape the FIFO properly
+ * for reselection. See esp100_reconnect_hwbug()
+ * to see how we try very hard to avoid this.
+ */
+ ESPLOG(("esp%d: illegal command\n", esp->esp_id));
+
+ esp_dump_state(esp, eregs, dregs);
+
+ if(SCptr) {
+ /* Devices with very buggy firmware can drop BSY
+ * during a scatter list interrupt when using sync
+ * mode transfers. We continue the transfer as
+ * expected, the target drops the bus, the ESP
+ * gets confused, and we get a illegal command
+ * interrupt because the bus is in the disconnected
+ * state now and ESP_CMD_TI is only allowed when
+ * a nexus is alive on the bus.
+ */
+ ESPLOG(("esp%d: Forcing async and disabling disconnect for "
+ "target %d\n", esp->esp_id, SCptr->target));
+ SCptr->device->borken = 1; /* foo on you */
+ }
+
+ what_next = do_reset_bus;
+ goto again;
+ }
+
+ if(!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) {
+ int phase;
+
+ if(SCptr) {
+ phase = SCptr->SCp.phase;
+ if(phase & in_phases_mask) {
+ what_next = esp_work_bus(esp, eregs, dregs);
+ } else if(phase & in_slct_mask) {
+ what_next = esp_select_complete(esp, eregs, dregs);
+ } else {
+ ESPLOG(("esp%d: interrupt for no good reason...\n",
+ esp->esp_id));
+ goto esp_handle_done;
+ }
} else {
- printk("esp: wacky state while in in_finale phase.\n");
- printk("esp_status: intr<%2x> stat<%2x> seq<%2x>\n",
- esp->ireg, esp->sreg, esp->seqreg);
- panic("esp: penguin esp state.");
+ ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
+ esp->esp_id));
+ what_next = do_reset_bus;
+ goto again;
+ }
+ } else if(esp->ireg & ESP_INTR_SR) {
+ ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id));
+ what_next = do_reset_complete;
+ } else if(esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) {
+ ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
+ esp->esp_id));
+ what_next = do_reset_bus;
+ goto again;
+ } else if(esp->ireg & ESP_INTR_RSEL) {
+ if(!SCptr) {
+ /* This is ok. */
+ what_next = esp_do_reconnect(esp, eregs, dregs);
+ } else if(SCptr->SCp.phase & in_slct_mask) {
+ /* Only selection code knows how to clean
+ * up properly.
+ */
+ ESPDISC(("Reselected during selection attempt\n"));
+ what_next = esp_select_complete(esp, eregs, dregs);
+ } else {
+ ESPLOG(("esp%d: Reselected while bus is busy\n",
+ esp->esp_id));
+ what_next = do_reset_bus;
+ goto again;
+ }
+ }
+
+ /* We're trying to fight stack problems, and inline as much as
+ * possible without making this driver a mess. hate hate hate
+ * This is tier-one in our dual level SCSI state machine.
+ */
+again:
+ switch(what_next) {
+ case do_intr_end:
+ goto esp_handle_done;
+
+ case do_work_bus:
+ what_next = esp_work_bus(esp, eregs, dregs);
+ break;
+
+ case do_phase_determine:
+ what_next = esp_do_phase_determine(esp, eregs, dregs);
+ break;
+
+ case do_reset_bus:
+ ESPLOG(("esp%d: resetting bus...\n", esp->esp_id));
+ esp->resetting_bus = 1;
+ esp_cmd(esp, eregs, ESP_CMD_RS);
+ goto esp_handle_done;
+
+ case do_reset_complete:
+ /* Tricky, we don't want to cause any more commands to
+ * go out until we clear all the live cmds by hand.
+ */
+ if(!DMA_ISBROKEN(esp->dma))
+ DMA_INTSOFF(dregs);
+ if(esp->current_SC) {
+ Scsi_Cmnd *SCptr = esp->current_SC;
+ if(!SCptr->use_sg)
+ mmu_release_scsi_one((char *)
+ SCptr->SCp.have_data_in,
+ SCptr->request_bufflen,
+ esp->edev->my_bus);
+ else
+ mmu_release_scsi_sgl((struct mmu_sglist *)
+ SCptr->buffer,
+ SCptr->use_sg - 1,
+ esp->edev->my_bus);
+ SCptr->result = (DID_RESET << 16);
+ SCptr->scsi_done(SCptr);
+ cli();
+ }
+ esp->current_SC = NULL;
+ if(esp->disconnected_SC) {
+ Scsi_Cmnd *SCptr;
+ while((SCptr = remove_first_SC(&esp->disconnected_SC))) {
+ if(!SCptr->use_sg)
+ mmu_release_scsi_one((char *)
+ SCptr->SCp.have_data_in,
+ SCptr->request_bufflen,
+ esp->edev->my_bus);
+ else
+ mmu_release_scsi_sgl((struct mmu_sglist *)
+ SCptr->buffer,
+ SCptr->use_sg - 1,
+ esp->edev->my_bus);
+ SCptr->result = (DID_RESET << 16);
+ SCptr->scsi_done(SCptr);
+ cli();
+ }
+ }
+ esp->resetting_bus = 0;
+ if(!DMA_ISBROKEN(esp->dma))
+ DMA_INTSON(dregs);
+
+ if(esp->current_SC) {
+ printk("esp%d: weird weird weird, current_SC not NULL after "
+ "SCSI bus reset.\n", esp->esp_id);
goto esp_handle_done;
}
- default:
- panic("esp: detected penguin phase.");
+
+ /* Now it is safe to execute more things. */
+ if(esp->issue_SC)
+ esp_exec_cmd(esp);
goto esp_handle_done;
- }
- panic("esp: Heading to the promised land.");
+
+ default:
+ /* state is completely lost ;-( */
+ ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
+ esp->esp_id));
+ what_next = do_reset_bus;
+ break;
+
+ };
+ goto again;
esp_handle_done:
DMA_IRQ_EXIT(esp->dma, dregs);
@@ -1118,11 +4057,28 @@
static void esp_intr(int irq, void *dev_id, struct pt_regs *pregs)
{
struct Sparc_ESP *esp;
+ static int running = 0;
+ int again;
+
+ /* It is ok to take irq's on one esp while the other
+ * is amidst the processing of a reset.
+ */
+ running++;
+ if(running > esps_running)
+ ESPLOG(("esp_intr: yieee, recursive interrupt!\n"));
/* Handle all ESP interrupts showing */
+repeat:
+ again = 0;
for_each_esp(esp) {
if(DMA_IRQ_P(esp->dregs)) {
+ again = 1;
+ ESPIRQ(("I%d(", esp->esp_id));
esp_handle(esp);
+ ESPIRQ((")"));
}
}
+ if(again)
+ goto repeat;
+ running--;
}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov