patch-2.4.21 linux-2.4.21/drivers/ide/ide-lib.c

• Lines: 440
• Date: 2003-06-13 07:51:33.000000000 -0700
• Orig file: linux-2.4.20/drivers/ide/ide-lib.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/drivers/ide/ide-lib.c linux-2.4.21/drivers/ide/ide-lib.c
@@ -0,0 +1,439 @@
+#include <linux/config.h>
+#define __NO_VERSION__
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/genhd.h>
+#include <linux/blkpg.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/hdreg.h>
+#include <linux/ide.h>
+
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+
+#include "ide_modes.h"
+
+/*
+ *	IDE library routines. These are plug in code that most 
+ *	drivers can use but occasionally may be weird enough
+ *	to want to do their own thing with
+ *
+ *	Add common non I/O op stuff here. Make sure it has proper
+ *	kernel-doc function headers or your patch will be rejected
+ */
+ 
+
+/**
+ *	ide_xfer_verbose	-	return IDE mode names
+ *	@xfer_rate: rate to name
+ *
+ *	Returns a constant string giving the name of the mode
+ *	requested.
+ */
+
+char *ide_xfer_verbose (u8 xfer_rate)
+{
+        switch(xfer_rate) {
+                case XFER_UDMA_7:	return("UDMA 7");
+                case XFER_UDMA_6:	return("UDMA 6");
+                case XFER_UDMA_5:	return("UDMA 5");
+                case XFER_UDMA_4:	return("UDMA 4");
+                case XFER_UDMA_3:	return("UDMA 3");
+                case XFER_UDMA_2:	return("UDMA 2");
+                case XFER_UDMA_1:	return("UDMA 1");
+                case XFER_UDMA_0:	return("UDMA 0");
+                case XFER_MW_DMA_2:	return("MW DMA 2");
+                case XFER_MW_DMA_1:	return("MW DMA 1");
+                case XFER_MW_DMA_0:	return("MW DMA 0");
+                case XFER_SW_DMA_2:	return("SW DMA 2");
+                case XFER_SW_DMA_1:	return("SW DMA 1");
+                case XFER_SW_DMA_0:	return("SW DMA 0");
+                case XFER_PIO_4:	return("PIO 4");
+                case XFER_PIO_3:	return("PIO 3");
+                case XFER_PIO_2:	return("PIO 2");
+                case XFER_PIO_1:	return("PIO 1");
+                case XFER_PIO_0:	return("PIO 0");
+                case XFER_PIO_SLOW:	return("PIO SLOW");
+                default:		return("XFER ERROR");
+        }
+}
+
+EXPORT_SYMBOL(ide_xfer_verbose);
+
+/**
+ *	ide_dma_speed	-	compute DMA speed
+ *	@drive: drive
+ *	@mode; intended mode
+ *
+ *	Checks the drive capabilities and returns the speed to use
+ *	for the transfer. Returns -1 if the requested mode is unknown
+ *	(eg PIO)
+ */
+ 
+u8 ide_dma_speed(ide_drive_t *drive, u8 mode)
+{
+	struct hd_driveid *id   = drive->id;
+	ide_hwif_t *hwif	= HWIF(drive);
+	u8 speed = 0;
+
+	if (drive->media != ide_disk && hwif->atapi_dma == 0)
+		return 0;
+
+	switch(mode) {
+		case 0x04:
+			if ((id->dma_ultra & 0x0040) &&
+			    (id->dma_ultra & hwif->ultra_mask))
+				{ speed = XFER_UDMA_6; break; }
+		case 0x03:
+			if ((id->dma_ultra & 0x0020) &&
+			    (id->dma_ultra & hwif->ultra_mask))
+				{ speed = XFER_UDMA_5; break; }
+		case 0x02:
+			if ((id->dma_ultra & 0x0010) &&
+			    (id->dma_ultra & hwif->ultra_mask))
+				{ speed = XFER_UDMA_4; break; }
+			if ((id->dma_ultra & 0x0008) &&
+			    (id->dma_ultra & hwif->ultra_mask))
+				{ speed = XFER_UDMA_3; break; }
+		case 0x01:
+			if ((id->dma_ultra & 0x0004) &&
+			    (id->dma_ultra & hwif->ultra_mask))
+				{ speed = XFER_UDMA_2; break; }
+			if ((id->dma_ultra & 0x0002) &&
+			    (id->dma_ultra & hwif->ultra_mask))
+				{ speed = XFER_UDMA_1; break; }
+			if ((id->dma_ultra & 0x0001) &&
+			    (id->dma_ultra & hwif->ultra_mask))
+				{ speed = XFER_UDMA_0; break; }
+		case 0x00:
+			if ((id->dma_mword & 0x0004) &&
+			    (id->dma_mword & hwif->mwdma_mask))
+				{ speed = XFER_MW_DMA_2; break; }
+			if ((id->dma_mword & 0x0002) &&
+			    (id->dma_mword & hwif->mwdma_mask))
+				{ speed = XFER_MW_DMA_1; break; }
+			if ((id->dma_mword & 0x0001) &&
+			    (id->dma_mword & hwif->mwdma_mask))
+				{ speed = XFER_MW_DMA_0; break; }
+			if ((id->dma_1word & 0x0004) &&
+			    (id->dma_1word & hwif->swdma_mask))
+				{ speed = XFER_SW_DMA_2; break; }
+			if ((id->dma_1word & 0x0002) &&
+			    (id->dma_1word & hwif->swdma_mask))
+				{ speed = XFER_SW_DMA_1; break; }
+			if ((id->dma_1word & 0x0001) &&
+			    (id->dma_1word & hwif->swdma_mask))
+				{ speed = XFER_SW_DMA_0; break; }
+	}
+
+//	printk("%s: %s: mode 0x%02x, speed 0x%02x\n",
+//		__FUNCTION__, drive->name, mode, speed);
+
+	return speed;
+}
+
+EXPORT_SYMBOL(ide_dma_speed);
+
+
+/**
+ *	ide_rate_filter		-	return best speed for mode
+ *	@mode: modes available
+ *	@speed: desired speed
+ *
+ *	Given the available DMA/UDMA mode this function returns
+ *	the best available speed at or below the speed requested.
+ */
+
+u8 ide_rate_filter (u8 mode, u8 speed) 
+{
+#ifdef CONFIG_BLK_DEV_IDEDMA
+	static u8 speed_max[] = {
+		XFER_MW_DMA_2, XFER_UDMA_2, XFER_UDMA_4,
+		XFER_UDMA_5, XFER_UDMA_6
+	};
+
+//	printk("%s: mode 0x%02x, speed 0x%02x\n", __FUNCTION__, mode, speed);
+
+	/* So that we remember to update this if new modes appear */
+	if (mode > 4)
+		BUG();
+	return min(speed, speed_max[mode]);
+#else /* !CONFIG_BLK_DEV_IDEDMA */
+	return min(speed, XFER_PIO_4);
+#endif /* CONFIG_BLK_DEV_IDEDMA */
+}
+
+EXPORT_SYMBOL(ide_rate_filter);
+
+int ide_dma_enable (ide_drive_t *drive)
+{
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct hd_driveid *id	= drive->id;
+
+	return ((int)	((((id->dma_ultra >> 8) & hwif->ultra_mask) ||
+			  ((id->dma_mword >> 8) & hwif->mwdma_mask) ||
+			  ((id->dma_1word >> 8) & hwif->swdma_mask)) ? 1 : 0));
+}
+
+EXPORT_SYMBOL(ide_dma_enable);
+
+const ide_pio_timings_t ide_pio_timings[6] = {
+	{ 70,	165,	600 },	/* PIO Mode 0 */
+	{ 50,	125,	383 },	/* PIO Mode 1 */
+	{ 30,	100,	240 },	/* PIO Mode 2 */
+	{ 30,	80,	180 },	/* PIO Mode 3 with IORDY */
+	{ 25,	70,	120 },	/* PIO Mode 4 with IORDY */
+	{ 20,	50,	100 }	/* PIO Mode 5 with IORDY (nonstandard) */
+};
+
+EXPORT_SYMBOL_GPL(ide_pio_timings);
+
+/*
+ * Black list. Some drives incorrectly report their maximal PIO mode,
+ * at least in respect to CMD640. Here we keep info on some known drives.
+ */
+static struct ide_pio_info {
+	const char	*name;
+	int		pio;
+} ide_pio_blacklist [] = {
+/*	{ "Conner Peripherals 1275MB - CFS1275A", 4 }, */
+	{ "Conner Peripherals 540MB - CFS540A", 3 },
+
+	{ "WDC AC2700",  3 },
+	{ "WDC AC2540",  3 },
+	{ "WDC AC2420",  3 },
+	{ "WDC AC2340",  3 },
+	{ "WDC AC2250",  0 },
+	{ "WDC AC2200",  0 },
+	{ "WDC AC21200", 4 },
+	{ "WDC AC2120",  0 },
+	{ "WDC AC2850",  3 },
+	{ "WDC AC1270",  3 },
+	{ "WDC AC1170",  1 },
+	{ "WDC AC1210",  1 },
+	{ "WDC AC280",   0 },
+/*	{ "WDC AC21000", 4 }, */
+	{ "WDC AC31000", 3 },
+	{ "WDC AC31200", 3 },
+/*	{ "WDC AC31600", 4 }, */
+
+	{ "Maxtor 7131 AT", 1 },
+	{ "Maxtor 7171 AT", 1 },
+	{ "Maxtor 7213 AT", 1 },
+	{ "Maxtor 7245 AT", 1 },
+	{ "Maxtor 7345 AT", 1 },
+	{ "Maxtor 7546 AT", 3 },
+	{ "Maxtor 7540 AV", 3 },
+
+	{ "SAMSUNG SHD-3121A", 1 },
+	{ "SAMSUNG SHD-3122A", 1 },
+	{ "SAMSUNG SHD-3172A", 1 },
+
+/*	{ "ST51080A", 4 },
+ *	{ "ST51270A", 4 },
+ *	{ "ST31220A", 4 },
+ *	{ "ST31640A", 4 },
+ *	{ "ST32140A", 4 },
+ *	{ "ST3780A",  4 },
+ */
+	{ "ST5660A",  3 },
+	{ "ST3660A",  3 },
+	{ "ST3630A",  3 },
+	{ "ST3655A",  3 },
+	{ "ST3391A",  3 },
+	{ "ST3390A",  1 },
+	{ "ST3600A",  1 },
+	{ "ST3290A",  0 },
+	{ "ST3144A",  0 },
+	{ "ST3491A",  1 },	/* reports 3, should be 1 or 2 (depending on */	
+				/* drive) according to Seagates FIND-ATA program */
+
+	{ "QUANTUM ELS127A", 0 },
+	{ "QUANTUM ELS170A", 0 },
+	{ "QUANTUM LPS240A", 0 },
+	{ "QUANTUM LPS210A", 3 },
+	{ "QUANTUM LPS270A", 3 },
+	{ "QUANTUM LPS365A", 3 },
+	{ "QUANTUM LPS540A", 3 },
+	{ "QUANTUM LIGHTNING 540A", 3 },
+	{ "QUANTUM LIGHTNING 730A", 3 },
+
+        { "QUANTUM FIREBALL_540", 3 }, /* Older Quantum Fireballs don't work */
+        { "QUANTUM FIREBALL_640", 3 }, 
+        { "QUANTUM FIREBALL_1080", 3 },
+        { "QUANTUM FIREBALL_1280", 3 },
+	{ NULL,	0 }
+};
+
+/**
+ *	ide_scan_pio_blacklist 	-	check for a blacklisted drive
+ *	@model: Drive model string
+ *
+ *	This routine searches the ide_pio_blacklist for an entry
+ *	matching the start/whole of the supplied model name.
+ *
+ *	Returns -1 if no match found.
+ *	Otherwise returns the recommended PIO mode from ide_pio_blacklist[].
+ */
+
+static int ide_scan_pio_blacklist (char *model)
+{
+	struct ide_pio_info *p;
+
+	for (p = ide_pio_blacklist; p->name != NULL; p++) {
+		if (strncmp(p->name, model, strlen(p->name)) == 0)
+			return p->pio;
+	}
+	return -1;
+}
+
+/**
+ *	ide_get_best_pio_mode	-	get PIO mode from drive
+ *	@driver: drive to consider
+ *	@mode_wanted: preferred mode
+ *	@max_mode: highest allowed
+ *	@d: pio data
+ *
+ *	This routine returns the recommended PIO settings for a given drive,
+ *	based on the drive->id information and the ide_pio_blacklist[].
+ *	This is used by most chipset support modules when "auto-tuning".
+ *
+ *	Drive PIO mode auto selection
+ */
+
+u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode, ide_pio_data_t *d)
+{
+	int pio_mode;
+	int cycle_time = 0;
+	int use_iordy = 0;
+	struct hd_driveid* id = drive->id;
+	int overridden  = 0;
+	int blacklisted = 0;
+
+	if (mode_wanted != 255) {
+		pio_mode = mode_wanted;
+	} else if (!drive->id) {
+		pio_mode = 0;
+	} else if ((pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
+		overridden = 1;
+		blacklisted = 1;
+		use_iordy = (pio_mode > 2);
+	} else {
+		pio_mode = id->tPIO;
+		if (pio_mode > 2) {	/* 2 is maximum allowed tPIO value */
+			pio_mode = 2;
+			overridden = 1;
+		}
+		if (id->field_valid & 2) {	  /* drive implements ATA2? */
+			if (id->capability & 8) { /* drive supports use_iordy? */
+				use_iordy = 1;
+				cycle_time = id->eide_pio_iordy;
+				if (id->eide_pio_modes & 7) {
+					overridden = 0;
+					if (id->eide_pio_modes & 4)
+						pio_mode = 5;
+					else if (id->eide_pio_modes & 2)
+						pio_mode = 4;
+					else
+						pio_mode = 3;
+				}
+			} else {
+				cycle_time = id->eide_pio;
+			}
+		}
+
+#if 0
+		if (drive->id->major_rev_num & 0x0004) printk("ATA-2 ");
+#endif
+
+		/*
+		 * Conservative "downgrade" for all pre-ATA2 drives
+		 */
+		if (pio_mode && pio_mode < 4) {
+			pio_mode--;
+			overridden = 1;
+#if 0
+			use_iordy = (pio_mode > 2);
+#endif
+			if (cycle_time && cycle_time < ide_pio_timings[pio_mode].cycle_time)
+				cycle_time = 0; /* use standard timing */
+		}
+	}
+	if (pio_mode > max_mode) {
+		pio_mode = max_mode;
+		cycle_time = 0;
+	}
+	if (d) {
+		d->pio_mode = pio_mode;
+		d->cycle_time = cycle_time ? cycle_time : ide_pio_timings[pio_mode].cycle_time;
+		d->use_iordy = use_iordy;
+		d->overridden = overridden;
+		d->blacklisted = blacklisted;
+	}
+	return pio_mode;
+}
+
+EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
+
+/**
+ *	ide_toggle_bounce	-	handle bounce buffering
+ *	@drive: drive to update
+ *	@on: on/off boolean
+ *
+ *	Enable or disable bounce buffering for the device. Drives move
+ *	between PIO and DMA and that changes the rules we need.
+ */
+ 
+void ide_toggle_bounce(ide_drive_t *drive, int on)
+{
+	u64 addr = BLK_BOUNCE_HIGH;	/* dma64_addr_t */
+
+	if (on && drive->media == ide_disk) {
+		if (!PCI_DMA_BUS_IS_PHYS)
+			addr = BLK_BOUNCE_ANY;
+		else
+			addr = HWIF(drive)->pci_dev->dma_mask;
+	}
+
+	blk_queue_bounce_limit(&drive->queue, addr);
+}
+
+EXPORT_SYMBOL(ide_toggle_bounce);
+
+
+/**
+ *	ide_set_xfer_rate	-	set transfer rate
+ *	@drive: drive to set
+ *	@speed: speed to attempt to set
+ *	
+ *	General helper for setting the speed of an IDE device. This
+ *	function knows about user enforced limits from the configuration
+ *	which speedproc() does not.  High level drivers should never
+ *	invoke speedproc() directly.
+ */
+ 
+int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
+{
+#ifndef CONFIG_BLK_DEV_IDEDMA
+	rate = min(rate, (u8) XFER_PIO_4);
+#endif
+	if(HWIF(drive)->speedproc)
+		return HWIF(drive)->speedproc(drive, rate);
+	else
+		return -1;
+}
+
+EXPORT_SYMBOL_GPL(ide_set_xfer_rate);
+