patch-2.1.132 linux/drivers/scsi/mac_esp.c

• Lines: 692
• Date: Fri Dec 18 10:12:25 1998
• Orig file: v2.1.131/linux/drivers/scsi/mac_esp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.131/linux/drivers/scsi/mac_esp.c linux/drivers/scsi/mac_esp.c
@@ -0,0 +1,691 @@
+/*
+ * 68k mac 53c9[46] scsi driver
+ *
+ * copyright (c) 1998, David Weis weisd3458@uni.edu
+ *
+ * debugging on Quadra 800 and 660AV Michael Schmitz, Dave Kilzer 7/98
+ *
+ * based loosely on cyber_esp.c
+ */
+
+/* these are unused for now */
+#define myreadl(addr) (*(volatile unsigned int *) (addr))
+#define mywritel(b, addr) ((*(volatile unsigned int *) (addr)) = (b))
+
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/malloc.h>
+#include <linux/blk.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+
+#include "scsi.h"
+#include "hosts.h"
+#include "NCR53C9x.h"
+#include "mac_esp.h"
+
+#include "../../arch/m68k/mac/via6522.h"  /* huh? */
+
+#include <asm/io.h>
+
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/macints.h>
+#include <asm/machw.h>
+
+#include <asm/pgtable.h>
+
+#include <asm/macintosh.h>
+
+extern inline void esp_handle(struct NCR_ESP *esp);
+extern void mac_esp_intr(int irq, void *dev_id, struct pt_regs *pregs);
+
+static int  dma_bytes_sent(struct NCR_ESP * esp, int fifo_count);
+static int  dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd *sp);
+static void dma_dump_state(struct NCR_ESP * esp);
+static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length);
+static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length);
+static void dma_ints_off(struct NCR_ESP * esp);
+static void dma_ints_on(struct NCR_ESP * esp);
+static int  dma_irq_p(struct NCR_ESP * esp);
+static int  dma_irq_p_quick(struct NCR_ESP * esp);
+static void dma_led_off(struct NCR_ESP * esp);
+static void dma_led_on(struct NCR_ESP *esp);
+static int  dma_ports_p(struct NCR_ESP *esp);
+static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write);
+static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write);
+
+
+static int esp_dafb_dma_irq_p(struct NCR_ESP * espdev);
+static int esp_iosb_dma_irq_p(struct NCR_ESP * espdev);
+
+static int esp_initialized = 0;
+
+static int setup_num_esps = -1;
+static int setup_disconnect = -1;
+static int setup_nosync = -1;
+static int setup_can_queue = -1;
+static int setup_cmd_per_lun = -1;
+static int setup_sg_tablesize = -1;
+#ifdef SUPPORT_TAGS
+static int setup_use_tagged_queuing = -1;
+#endif
+static int setup_hostid = -1;
+
+/*
+ * Experimental ESP inthandler; check macints.c to make sure dev_id is 
+ * set up properly!
+ */
+
+void mac_esp_intr(int irq, void *dev_id, struct pt_regs *pregs)
+{
+	struct NCR_ESP *esp = (struct NCR_ESP *) dev_id;
+	int irq_p = 0;
+
+	/* Handle the one ESP interrupt showing at this IRQ level. */
+	if(((esp)->irq & 0xff) == irq) {
+	/*
+	 * Debug ..
+	 */
+		irq_p = esp->dma_irq_p(esp);
+	 	printk("mac_esp: irq_p %x current %p disconnected %p\n",
+	 		irq_p, esp->current_SC, esp->disconnected_SC);
+	 		
+		/*
+		 * Mac: if we're here, it's an ESP interrupt for sure!
+		 */
+		if((esp->current_SC || esp->disconnected_SC)) {
+			esp->dma_ints_off(esp);
+
+			ESPIRQ(("I%d(", esp->esp_id));
+			esp_handle(esp);
+			ESPIRQ((")"));
+
+			esp->dma_ints_on(esp);
+		}
+	}
+}
+
+/*
+ * Debug hooks; use for playing with the interrupt flag testing and interrupt
+ * acknowledge on the various machines
+ */
+
+void scsi_esp_polled(int irq, void *dev_id, struct pt_regs *pregs)
+{
+	if (esp_initialized == 0)
+		return;
+
+	mac_esp_intr(irq, dev_id, pregs);
+}
+
+void fake_intr(int irq, void *dev_id, struct pt_regs *pregs)
+{
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: got irq\n");
+#endif
+
+	mac_esp_intr(irq, dev_id, pregs);
+}
+
+void fake_drq(int irq, void *dev_id, struct pt_regs *pregs)
+{
+	printk("mac_esp: got drq\n");
+}
+
+#define DRIVER_SETUP
+
+/*
+ * Function : mac_scsi_setup(char *str, int *ints)
+ *
+ * Purpose : booter command line initialization of the overrides array,
+ *
+ * Inputs : str - unused, ints - array of integer parameters with ints[0]
+ *	equal to the number of ints.
+ *
+ * Currently unused in the new driver; need to add settable parameters to the 
+ * detect function.
+ *
+ */
+
+void mac_esp_setup(char *str, int *ints) {
+#ifdef DRIVER_SETUP
+	/* Format of mac53c9x parameter is:
+	 *   mac53c9x=<num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
+	 * Negative values mean don't change.
+	 */
+	
+	/* Grmbl... the standard parameter parsing can't handle negative numbers
+	 * :-( So let's do it ourselves!
+	 */
+
+	int i = ints[0]+1, fact;
+
+	while( str && (isdigit(*str) || *str == '-') && i <= 10) {
+		if (*str == '-')
+			fact = -1, ++str;
+		else
+			fact = 1;
+		ints[i++] = simple_strtoul( str, NULL, 0 ) * fact;
+		if ((str = strchr( str, ',' )) != NULL)
+			++str;
+	}
+	ints[0] = i-1;
+	
+	if (ints[0] < 1) {
+		printk( "mac_esp_setup: no arguments!\n" );
+		return;
+	}
+
+	if (ints[0] >= 1) {
+		if (ints[1] > 0)
+			/* no limits on this, just > 0 */
+		if (ints[1] >= 0 && ints[1] <= 2)
+			setup_num_esps = ints[1];
+		else if (ints[1] > 2)
+			printk( "mac_esp_setup: invalid number of hosts %d !\n", ints[1] );
+	}
+	if (ints[0] >= 2) {
+		if (ints[2] > 0)
+			setup_disconnect = ints[2];
+	}
+	if (ints[0] >= 3) {
+		if (ints[3] >= 0) {
+			setup_nosync = ints[3];
+		}
+	}
+	if (ints[0] >= 4) {
+		if (ints[4] > 0)
+			/* no limits on this, just > 0 */
+			setup_can_queue = ints[4];
+	}
+	if (ints[0] >= 5) {
+		if (ints[5] > 0)
+			setup_cmd_per_lun = ints[5];
+	}
+	if (ints[0] >= 6) {
+		if (ints[6] >= 0) {
+			setup_sg_tablesize = ints[6];
+			/* Must be <= SG_ALL (255) */
+			if (setup_sg_tablesize > SG_ALL)
+				setup_sg_tablesize = SG_ALL;
+		}
+	}
+	if (ints[0] >= 7) {
+		/* Must be between 0 and 7 */
+		if (ints[7] >= 0 && ints[7] <= 7)
+			setup_hostid = ints[7];
+		else if (ints[7] > 7)
+			printk( "mac_esp_setup: invalid host ID %d !\n", ints[7] );
+	}
+#ifdef SUPPORT_TAGS
+	if (ints[0] >= 8) {
+		if (ints[8] >= 0)
+			setup_use_tagged_queuing = !!ints[8];
+	}
+#endif
+#endif
+}
+
+/*
+ * ESP address 'detection'
+ */
+
+unsigned long get_base(int chip_num)
+{
+	/*
+	 * using the chip_num and mac model, figure out where the
+	 * chips are mapped
+	 */
+
+	unsigned long io_base = 0x50f00000;
+	unsigned int second_offset = 0x402;
+	unsigned long scsi_loc = 0;
+
+	switch (macintosh_config->scsi_type) {
+
+	/* 950, 900, 700 */
+	case MAC_SCSI_QUADRA2:
+		scsi_loc =  io_base + 0xf000 + ((chip_num == 0) ? 0 : second_offset);
+		break;
+
+	/* av's */
+	case MAC_SCSI_QUADRA3:
+		scsi_loc = io_base + 0x18000 + ((chip_num == 0) ? 0 : second_offset);
+		break;
+
+	/* most quadra/centris models are like this */	
+	case MAC_SCSI_QUADRA:
+		scsi_loc = io_base + 0x10000;
+		break;
+
+	default:
+		printk("mac_esp: get_base: hit default!\n");
+		scsi_loc = io_base + 0x10000;
+		break;
+
+	} /* switch */
+
+	printk("mac_esp: io base at 0x%lx\n", scsi_loc);
+
+	return scsi_loc;
+}
+
+/*
+ * Model dependent ESP setup
+ */
+
+int mac_esp_detect(Scsi_Host_Template * tpnt)
+{
+	int quick = 0;
+	int chipnum, chipspresent = 0;
+#if 0
+	unsigned long timeout;
+#endif
+
+	/* what do we have in this machine... */
+	if (MACHW_PRESENT(MAC_SCSI_96)) {
+		chipspresent ++;
+	}
+
+	if (MACHW_PRESENT(MAC_SCSI_96_2)) {
+		chipspresent ++;
+	}
+
+	/* number of ESPs present ? */
+	if (setup_num_esps >= 0) {
+	  if (chipspresent >= setup_num_esps)
+	    chipspresent = setup_num_esps;
+	  else
+	    printk("mac_esp_detect: num_hosts detected %d setup %d \n",
+		   chipspresent, setup_num_esps);
+	}
+
+	/* TODO: add disconnect / nosync flags */
+
+	/* setup variables */
+	tpnt->can_queue =
+	  (setup_can_queue > 0) ? setup_can_queue : 7;
+	tpnt->cmd_per_lun =
+	  (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : 1;
+	tpnt->sg_tablesize = 
+	  (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_ALL;
+
+	if (setup_hostid >= 0)
+	  tpnt->this_id = setup_hostid;
+	else {
+	  /* use 7 as default */
+	  tpnt->this_id = 7;
+	}
+
+#ifdef SUPPORT_TAGS
+	if (setup_use_tagged_queuing < 0)
+		setup_use_tagged_queuing = DEFAULT_USE_TAGGED_QUEUING;
+#endif
+
+	for (chipnum = 0; chipnum < chipspresent; chipnum ++) {
+		struct NCR_ESP * esp;
+
+		esp = esp_allocate(tpnt, (void *) NULL);
+		esp->eregs = (struct ESP_regs *) get_base(chipnum);
+
+		esp->dma_irq_p = &esp_dafb_dma_irq_p;
+		if (chipnum == 0) {
+
+			if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) {
+				/* most machines except those below :-) */
+				quick = 1;
+				esp->dma_irq_p = &esp_iosb_dma_irq_p;
+			} else if (macintosh_config->scsi_type == MAC_SCSI_QUADRA3) {
+				/* mostly av's */
+				quick = 0;
+			} else {
+				/* q950, 900, 700 */
+				quick = 1;
+				writel(0x1d1, 0xf9800024);
+				esp->dregs = (void *) 0xf9800024;
+			}
+
+		} else { /* chipnum */
+
+			quick = 1;
+			writel(0x1d1, 0xf9800028);
+			esp->dregs = (void *) 0xf9800028;
+
+		} /* chipnum == 0 */
+
+
+		/* use pio for command bytes; pio for message/data: TBI */
+		esp->do_pio_cmds = 1;
+
+		/* various functions */
+		esp->dma_bytes_sent = &dma_bytes_sent;
+		esp->dma_can_transfer = &dma_can_transfer;
+		esp->dma_dump_state = &dma_dump_state;
+		esp->dma_init_read = NULL;
+		esp->dma_init_write = NULL;
+		esp->dma_ints_off = &dma_ints_off;
+		esp->dma_ints_on = &dma_ints_on;
+
+		esp->dma_ports_p = &dma_ports_p;
+
+
+		/* Optional functions */
+		esp->dma_barrier = NULL;
+		esp->dma_drain = NULL;
+		esp->dma_invalidate = NULL;
+		esp->dma_irq_entry = NULL;
+		esp->dma_irq_exit = NULL;
+		esp->dma_led_on = NULL;
+		esp->dma_led_off = NULL;
+		esp->dma_poll = NULL;
+		esp->dma_reset = NULL;
+
+		/* SCSI chip speed */
+		/* below esp->cfreq = 40000000; */
+
+
+		if (quick) {
+			/* 'quick' means there's handshake glue logic like in the 5380 case */
+			esp->dma_setup = &dma_setup_quick;
+		} else {
+			esp->dma_setup = &dma_setup;
+		}
+
+		if (chipnum == 0) {
+
+			esp->irq = IRQ_MAC_SCSI;
+
+			request_irq(IRQ_MAC_SCSI, esp_intr, 0, "Mac ESP SCSI", esp);
+			request_irq(IRQ_MAC_SCSIDRQ, fake_drq, 0, "Mac ESP DRQ", esp);
+
+			if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) {
+				esp->cfreq = 16500000;
+			} else {
+				esp->cfreq = 25000000;
+			}
+
+
+		} else { /* chipnum == 1 */
+
+			esp->irq = IRQ_MAC_SCSIDRQ;
+
+			request_irq(IRQ_MAC_SCSIDRQ, esp_intr, 0, "Mac ESP SCSI 2", esp);
+
+			esp->cfreq = 25000000;
+
+		}
+
+		if (quick) {
+			printk("esp: using quick version\n");
+		}
+
+		printk("esp: addr at 0x%p\n", esp->eregs);
+
+		esp->scsi_id = 7;
+		esp->diff = 0;
+
+		esp_initialize(esp);
+
+	} /* for chipnum */
+
+	if (chipspresent)
+		printk("\nmac_esp: %d esp controllers found\n", chipspresent);
+
+	esp_initialized = chipspresent;
+
+	return chipspresent;
+}
+
+/*
+ * I've been wondering what this is supposed to do, for some time. Talking 
+ * to Allen Briggs: These machines have an extra register someplace where the
+ * DRQ pin of the ESP can be monitored. That isn't useful for determining 
+ * anything else (such as reselect interrupt or other magic) though. 
+ * Maybe make the semantics should be changed like 
+ * if (esp->current_SC)
+ *	... check DRQ flag ...
+ * else 
+ *	... disconnected, check pending VIA interrupt ...
+ *
+ * There's a problem with using the dabf flag or mac_irq_pending() here: both
+ * seem to return 1 even though no interrupt is currently pending, resulting
+ * in esp_exec_cmd() holding off the next command, and possibly infinite loops
+ * in esp_intr(). 
+ * Short term fix: just use esp_status & ESP_STAT_INTR here, as long as we
+ * use simple PIO. The DRQ status will be important when implementing pseudo
+ * DMA mode (set up ESP transfer count, return, do a batch of bytes in PIO or 
+ * 'hardware handshake' mode upon DRQ).
+ * If you plan on changing this (i.e. to save the esp_status register access in 
+ * favor of a VIA register access or a shadow register for the IFR), make sure
+ * to try a debug version of this first to monitor what registers would be a good
+ * indicator of the ESP interrupt.
+ */
+
+static int esp_dafb_dma_irq_p(struct NCR_ESP * esp)
+{
+	unsigned int ret;
+	int sreg = esp->eregs->esp_status;
+
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: esp_dafb_dma_irq_p dafb %d irq %d\n", 
+		readl(esp->dregs), mac_irq_pending(IRQ_MAC_SCSI));
+#endif
+
+	sreg &= ESP_STAT_INTR;
+
+	/*
+	 * maybe working; this is essentially what's used for iosb_dma_irq_p
+	 */
+	if (sreg)
+		return 1;
+	else
+		return 0;
+
+	/*
+	 * didn't work ...
+	 */
+#if 0
+	if (esp->current_SC)
+		ret = readl(esp->dregs) & 0x200;
+	else if (esp->disconnected_SC)
+		ret = 1; /* sreg ?? */
+	else
+		ret = mac_irq_pending(IRQ_MAC_SCSI);
+
+	return(ret);
+#endif
+
+}
+
+/*
+ * See above: testing mac_irq_pending always returned 8 (SCSI IRQ) regardless 
+ * of the actual ESP status.
+ */
+
+static int esp_iosb_dma_irq_p(struct NCR_ESP * esp)
+{
+	int ret  = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ);
+	int sreg = esp->eregs->esp_status;
+
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n", 
+		mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI), 
+		sreg, esp->current_SC, esp->disconnected_SC);
+#endif
+
+	sreg &= ESP_STAT_INTR;
+
+	if (sreg)
+		return (sreg);
+	else
+		return 0;
+}
+
+/*
+ * This seems to be OK for PIO at least ... usually 0 after PIO.
+ */
+
+static int dma_bytes_sent(struct NCR_ESP * esp, int fifo_count)
+{
+
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: dma bytes sent = %x\n", fifo_count);
+#endif
+
+	return fifo_count;
+}
+
+/*
+ * dma_can_transfer is used to switch between DMA and PIO, if DMA (pseudo)
+ * is ever implemented. Returning 0 here will use PIO.
+ */
+
+static int dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd * sp)
+{
+	unsigned long sz = sp->SCp.this_residual;
+#if 0	/* no DMA yet; make conditional */
+	if (sz > 0x10000000) {
+		sz = 0x10000000;
+	}
+	printk("mac_esp: dma can transfer = 0lx%x\n", sz);
+#else
+
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: pio to transfer = %ld\n", sz);
+#endif
+
+	sz = 0;
+#endif
+	return sz;
+}
+
+/*
+ * Not yet ...
+ */
+
+static void dma_dump_state(struct NCR_ESP * esp)
+{
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: dma_dump_state: called\n");
+#endif
+#if 0
+	ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
+		esp->esp_id, ((struct mac_dma_registers *)
+		(esp->dregs))->cond_reg));
+#endif
+}
+
+/*
+ * DMA setup: should be used to set up the ESP transfer count for pseudo
+ * DMA transfers; need a DRQ transfer function to do the actual transfer
+ */
+
+static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length)
+{
+	printk("mac_esp: dma_init_read\n");
+}
+
+
+static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length)
+{
+	printk("mac_esp: dma_init_write\n");
+}
+
+
+static void dma_ints_off(struct NCR_ESP * esp)
+{
+	mac_turnoff_irq(esp->irq);
+}
+
+
+static void dma_ints_on(struct NCR_ESP * esp)
+{
+	mac_turnon_irq(esp->irq);
+}
+
+/*
+ * generic dma_irq_p(), unused
+ */
+
+static int dma_irq_p(struct NCR_ESP * esp)
+{
+	int i = esp->eregs->esp_status;
+
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: dma_irq_p status %d\n", i);
+#endif
+
+	return (i & ESP_STAT_INTR);
+}
+
+static int dma_irq_p_quick(struct NCR_ESP * esp)
+{
+	/*
+	 * Copied from iosb_dma_irq_p()
+	 */
+	int ret  = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ);
+	int sreg = esp->eregs->esp_status;
+
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n", 
+		mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI), 
+		sreg, esp->current_SC, esp->disconnected_SC);
+#endif
+
+	sreg &= ESP_STAT_INTR;
+
+	if (sreg)
+		return (sreg);
+	else
+		return 0;
+
+}
+
+static void dma_led_off(struct NCR_ESP * esp)
+{
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: dma_led_off: called\n");
+#endif
+}
+
+
+static void dma_led_on(struct NCR_ESP * esp)
+{
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: dma_led_on: called\n");
+#endif
+}
+
+
+static int dma_ports_p(struct NCR_ESP * esp)
+{
+	return 0;
+}
+
+
+static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write)
+{
+
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: dma_setup\n");
+#endif
+
+	if (write) {
+		dma_init_read(esp, (char *) addr, count);
+	} else {
+		dma_init_write(esp, (char *) addr, count);
+	}
+}
+
+
+static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write)
+{
+#ifdef DEBUG_MAC_ESP
+	printk("mac_esp: dma_setup_quick\n");
+#endif
+}