patch-2.3.99-pre1 linux/drivers/ide/pdc202xx.c

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diff -u --recursive --new-file v2.3.51/linux/drivers/ide/pdc202xx.c linux/drivers/ide/pdc202xx.c
@@ -0,0 +1,731 @@
+/*
+ *  linux/drivers/block/pdc202xx.c	Version 0.29	Feb. 10, 2000
+ *
+ *  Copyright (C) 1998-2000	Andre Hedrick (andre@suse.com)
+ *  May be copied or modified under the terms of the GNU General Public License
+ *
+ *  Promise Ultra33 cards with BIOS v1.20 through 1.28 will need this
+ *  compiled into the kernel if you have more than one card installed.
+ *  Note that BIOS v1.29 is reported to fix the problem.  Since this is
+ *  safe chipset tuning, including this support is harmless
+ *
+ *  The latest chipset code will support the following ::
+ *  Three Ultra33 controllers and 12 drives.
+ *  8 are UDMA supported and 4 are limited to DMA mode 2 multi-word.
+ *  The 8/4 ratio is a BIOS code limit by promise.
+ *
+ *  UNLESS you enable "CONFIG_PDC202XX_BURST"
+ *
+ *  There is only one BIOS in the three contollers.
+ *
+ *  May  8 20:56:17 Orion kernel:
+ *  Uniform Multi-Platform E-IDE driver Revision: 6.19
+ *  PDC20246: IDE controller on PCI bus 00 dev a0
+ *  PDC20246: not 100% native mode: will probe irqs later
+ *  PDC20246: ROM enabled at 0xfebd0000
+ *  PDC20246: (U)DMA Burst Bit ENABLED Primary PCI Mode Secondary PCI Mode.
+ *      ide0: BM-DMA at 0xef80-0xef87, BIOS settings: hda:DMA, hdb:DMA
+ *      ide1: BM-DMA at 0xef88-0xef8f, BIOS settings: hdc:pio, hdd:pio
+ *  PDC20246: IDE controller on PCI bus 00 dev 98
+ *  PDC20246: not 100% native mode: will probe irqs later
+ *  PDC20246: ROM enabled at 0xfebc0000
+ *  PDC20246: (U)DMA Burst Bit ENABLED Primary PCI Mode Secondary PCI Mode.
+ *      ide2: BM-DMA at 0xef40-0xef47, BIOS settings: hde:DMA, hdf:DMA
+ *      ide3: BM-DMA at 0xef48-0xef4f, BIOS settings: hdg:DMA, hdh:DMA
+ *  PDC20246: IDE controller on PCI bus 00 dev 90
+ *  PDC20246: not 100% native mode: will probe irqs later
+ *  PDC20246: ROM enabled at 0xfebb0000
+ *  PDC20246: (U)DMA Burst Bit DISABLED Primary PCI Mode Secondary PCI Mode.
+ *  PDC20246: FORCING BURST BIT 0x00 -> 0x01 ACTIVE
+ *      ide4: BM-DMA at 0xef00-0xef07, BIOS settings: hdi:DMA, hdj:pio
+ *      ide5: BM-DMA at 0xef08-0xef0f, BIOS settings: hdk:pio, hdl:pio
+ *  PIIX3: IDE controller on PCI bus 00 dev 39
+ *  PIIX3: device not capable of full native PCI mode
+ *
+ *  ide0 at 0xeff0-0xeff7,0xefe6 on irq 19
+ *  ide1 at 0xefa8-0xefaf,0xebe6 on irq 19
+ *  ide2 at 0xefa0-0xefa7,0xef7e on irq 18
+ *  ide3 at 0xef68-0xef6f,0xef66 on irq 18
+ *  ide4 at 0xef38-0xef3f,0xef62 on irq 17
+ *  hda: QUANTUM FIREBALL ST6.4A, 6149MB w/81kB Cache, CHS=13328/15/63, UDMA(33)
+ *  hdb: QUANTUM FIREBALL ST3.2A, 3079MB w/81kB Cache, CHS=6256/16/63, UDMA(33)
+ *  hde: Maxtor 72004 AP, 1916MB w/128kB Cache, CHS=3893/16/63, DMA
+ *  hdf: Maxtor 71626 A, 1554MB w/64kB Cache, CHS=3158/16/63, DMA
+ *  hdi: Maxtor 90680D4, 6485MB w/256kB Cache, CHS=13176/16/63, UDMA(33)
+ *  hdj: Maxtor 90680D4, 6485MB w/256kB Cache, CHS=13176/16/63, UDMA(33)
+ *
+ *  Promise Ultra66 cards with BIOS v1.11 this
+ *  compiled into the kernel if you have more than one card installed.
+ *
+ *  PDC20262: IDE controller on PCI bus 00 dev a0
+ *  PDC20262: not 100% native mode: will probe irqs later
+ *  PDC20262: ROM enabled at 0xfebb0000
+ *  PDC20262: (U)DMA Burst Bit ENABLED Primary PCI Mode Secondary PCI Mode.
+ *      ide0: BM-DMA at 0xef00-0xef07, BIOS settings: hda:pio, hdb:pio
+ *      ide1: BM-DMA at 0xef08-0xef0f, BIOS settings: hdc:pio, hdd:pio
+ *
+ *  UDMA 4/2 and UDMA 3/1 only differ by the testing bit 13 in word93.
+ *  Chipset timing speeds must be identical
+ *
+ *  drive_number
+ *      = ((HWIF(drive)->channel ? 2 : 0) + (drive->select.b.unit & 0x01));
+ *      = ((hwif->channel ? 2 : 0) + (drive->select.b.unit & 0x01));
+ */
+
+/*
+ *  Portions Copyright (C) 1999 Promise Technology, Inc.
+ *  Author: Frank Tiernan (frankt@promise.com)
+ *  Released under terms of General Public License
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ide.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include "ide_modes.h"
+
+#define PDC202XX_DEBUG_DRIVE_INFO		0
+#define PDC202XX_DECODE_REGISTER_INFO		0
+
+#undef DISPLAY_PDC202XX_TIMINGS
+
+#if defined(DISPLAY_PDC202XX_TIMINGS) && defined(CONFIG_PROC_FS)
+#include <linux/stat.h>
+#include <linux/proc_fs.h>
+
+static int pdc202xx_get_info(char *, char **, off_t, int);
+extern int (*pdc202xx_display_info)(char *, char **, off_t, int); /* ide-proc.c */
+extern char *ide_media_verbose(ide_drive_t *);
+static struct pci_dev *bmide_dev;
+
+static int pdc202xx_get_info (char *buffer, char **addr, off_t offset, int count)
+{
+	char *p = buffer;
+
+	u32 bibma = bmide_dev->resource[4].start;
+	u8 c0 = 0, c1 = 0;
+
+        /*
+         * at that point bibma+0x2 et bibma+0xa are byte registers
+         * to investigate:
+         */
+	c0 = inb_p((unsigned short)bibma + 0x02);
+	c1 = inb_p((unsigned short)bibma + 0x0a);
+
+	switch(bmide_dev->device) {	
+		case PCI_DEVICE_ID_PROMISE_20262:
+			p += sprintf(p, "\n                                PDC20262 Chipset.\n");
+			break;
+		case PCI_DEVICE_ID_PROMISE_20246:
+			p += sprintf(p, "\n                                PDC20246 Chipset.\n");
+			break;
+		default:
+			p += sprintf(p, "\n                                PDC202XX Chipset.\n");
+			break;
+	}
+
+	p += sprintf(p, "--------------- Primary Channel ---------------- Secondary Channel -------------\n");
+	p += sprintf(p, "                %sabled                         %sabled\n",
+			(c0&0x80) ? "dis" : " en",
+			(c1&0x80) ? "dis" : " en");
+	p += sprintf(p, "--------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------\n");
+	p += sprintf(p, "DMA enabled:    %s              %s             %s               %s\n",
+			(c0&0x20) ? "yes" : "no ", (c0&0x40) ? "yes" : "no ",
+			(c1&0x20) ? "yes" : "no ", (c1&0x40) ? "yes" : "no " );
+
+	p += sprintf(p, "UDMA\n");
+	p += sprintf(p, "DMA\n");
+	p += sprintf(p, "PIO\n");
+
+	return p-buffer;	/* => must be less than 4k! */
+}
+#endif  /* defined(DISPLAY_PDC202XX_TIMINGS) && defined(CONFIG_PROC_FS) */
+
+byte pdc202xx_proc = 0;
+
+extern char *ide_xfer_verbose (byte xfer_rate);
+
+/* A Register */
+#define	SYNC_ERRDY_EN	0xC0
+
+#define	SYNC_IN		0x80	/* control bit, different for master vs. slave drives */
+#define	ERRDY_EN	0x40	/* control bit, different for master vs. slave drives */
+#define	IORDY_EN	0x20	/* PIO: IOREADY */
+#define	PREFETCH_EN	0x10	/* PIO: PREFETCH */
+
+#define	PA3		0x08	/* PIO"A" timing */
+#define	PA2		0x04	/* PIO"A" timing */
+#define	PA1		0x02	/* PIO"A" timing */
+#define	PA0		0x01	/* PIO"A" timing */
+
+/* B Register */
+
+#define	MB2		0x80	/* DMA"B" timing */
+#define	MB1		0x40	/* DMA"B" timing */
+#define	MB0		0x20	/* DMA"B" timing */
+
+#define	PB4		0x10	/* PIO_FORCE 1:0 */
+
+#define	PB3		0x08	/* PIO"B" timing */	/* PIO flow Control mode */
+#define	PB2		0x04	/* PIO"B" timing */	/* PIO 4 */
+#define	PB1		0x02	/* PIO"B" timing */	/* PIO 3 half */
+#define	PB0		0x01	/* PIO"B" timing */	/* PIO 3 other half */
+
+/* C Register */
+#define	IORDYp_NO_SPEED	0x4F
+#define	SPEED_DIS	0x0F
+
+#define	DMARQp		0x80
+#define	IORDYp		0x40
+#define	DMAR_EN		0x20
+#define	DMAW_EN		0x10
+
+#define	MC3		0x08	/* DMA"C" timing */
+#define	MC2		0x04	/* DMA"C" timing */
+#define	MC1		0x02	/* DMA"C" timing */
+#define	MC0		0x01	/* DMA"C" timing */
+
+#if PDC202XX_DECODE_REGISTER_INFO
+
+#define REG_A		0x01
+#define REG_B		0x02
+#define REG_C		0x04
+#define REG_D		0x08
+
+static void decode_registers (byte registers, byte value)
+{
+	byte	bit = 0, bit1 = 0, bit2 = 0;
+
+	switch(registers) {
+		case REG_A:
+			bit2 = 0;
+			printk("A Register ");
+			if (value & 0x80) printk("SYNC_IN ");
+			if (value & 0x40) printk("ERRDY_EN ");
+			if (value & 0x20) printk("IORDY_EN ");
+			if (value & 0x10) printk("PREFETCH_EN ");
+			if (value & 0x08) { printk("PA3 ");bit2 |= 0x08; }
+			if (value & 0x04) { printk("PA2 ");bit2 |= 0x04; }
+			if (value & 0x02) { printk("PA1 ");bit2 |= 0x02; }
+			if (value & 0x01) { printk("PA0 ");bit2 |= 0x01; }
+			printk("PIO(A) = %d ", bit2);
+			break;
+		case REG_B:
+			bit1 = 0;bit2 = 0;
+			printk("B Register ");
+			if (value & 0x80) { printk("MB2 ");bit1 |= 0x80; }
+			if (value & 0x40) { printk("MB1 ");bit1 |= 0x40; }
+			if (value & 0x20) { printk("MB0 ");bit1 |= 0x20; }
+			printk("DMA(B) = %d ", bit1 >> 5);
+			if (value & 0x10) printk("PIO_FORCED/PB4 ");
+			if (value & 0x08) { printk("PB3 ");bit2 |= 0x08; }
+			if (value & 0x04) { printk("PB2 ");bit2 |= 0x04; }
+			if (value & 0x02) { printk("PB1 ");bit2 |= 0x02; }
+			if (value & 0x01) { printk("PB0 ");bit2 |= 0x01; }
+			printk("PIO(B) = %d ", bit2);
+			break;
+		case REG_C:
+			bit2 = 0;
+			printk("C Register ");
+			if (value & 0x80) printk("DMARQp ");
+			if (value & 0x40) printk("IORDYp ");
+			if (value & 0x20) printk("DMAR_EN ");
+			if (value & 0x10) printk("DMAW_EN ");
+
+			if (value & 0x08) { printk("MC3 ");bit2 |= 0x08; }
+			if (value & 0x04) { printk("MC2 ");bit2 |= 0x04; }
+			if (value & 0x02) { printk("MC1 ");bit2 |= 0x02; }
+			if (value & 0x01) { printk("MC0 ");bit2 |= 0x01; }
+			printk("DMA(C) = %d ", bit2);
+			break;
+		case REG_D:
+			printk("D Register ");
+			break;
+		default:
+			return;
+	}
+	printk("\n        %s ", (registers & REG_D) ? "DP" :
+				(registers & REG_C) ? "CP" :
+				(registers & REG_B) ? "BP" :
+				(registers & REG_A) ? "AP" : "ERROR");
+	for (bit=128;bit>0;bit/=2)
+		printk("%s", (value & bit) ? "1" : "0");
+	printk("\n");
+}
+
+#endif /* PDC202XX_DECODE_REGISTER_INFO */
+
+static int config_chipset_for_dma (ide_drive_t *drive, byte ultra)
+{
+	struct hd_driveid *id	= drive->id;
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct pci_dev *dev	= hwif->pci_dev;
+	unsigned long high_16	= dev->resource[4].start & PCI_BASE_ADDRESS_IO_MASK;
+
+	int			err;
+	unsigned int		drive_conf;
+	byte			drive_pci;
+	byte			test1, test2, speed = -1;
+	byte			AP, BP, CP, DP, TB, TC;
+	unsigned short		EP;
+	byte CLKSPD		= IN_BYTE(high_16 + 0x11);
+	int drive_number	= ((hwif->channel ? 2 : 0) + (drive->select.b.unit & 0x01));
+	byte udma_66		= ((id->hw_config & 0x2000) && (hwif->udma_four)) ? 1 : 0;
+	byte udma_33		= ultra ? (inb(high_16 + 0x001f) & 1) : 0;
+
+	/*
+	 * Set the control register to use the 66Mhz system
+	 * clock for UDMA 3/4 mode operation. If one drive on
+	 * a channel is U66 capable but the other isn't we
+	 * fall back to U33 mode. The BIOS INT 13 hooks turn
+	 * the clock on then off for each read/write issued. I don't
+	 * do that here because it would require modifying the
+	 * kernel, seperating the fop routines from the kernel or
+	 * somehow hooking the fops calls. It may also be possible to
+	 * leave the 66Mhz clock on and readjust the timing
+	 * parameters.
+	 */
+
+	byte mask		= hwif->channel ? 0x08 : 0x02;
+	unsigned short c_mask	= hwif->channel ? (1<<11) : (1<<10);
+	byte ultra_66		= ((id->dma_ultra & 0x0010) || (id->dma_ultra & 0x0008)) ? 1 : 0;
+
+	pci_read_config_word(dev, 0x50, &EP);
+
+	if ((ultra_66) && (EP & c_mask)) {
+#ifdef DEBUG
+		printk("ULTRA66: %s channel of Ultra 66 requires an 80-pin cable for Ultra66 operation.\n", hwif->channel ? "Secondary", "Primary");
+		printk("         Switching to Ultra33 mode.\n");
+#endif /* DEBUG */
+		/* Primary   : zero out second bit */
+		/* Secondary : zero out fourth bit */
+		OUT_BYTE(CLKSPD & ~mask, (high_16 + 0x11));
+	} else {
+		if (ultra_66) {
+			/*
+			 * check to make sure drive on same channel
+			 * is u66 capable
+			 */
+			if (hwif->drives[!(drive_number%2)].id) {
+				if ((hwif->drives[!(drive_number%2)].id->dma_ultra & 0x0010) ||
+				    (hwif->drives[!(drive_number%2)].id->dma_ultra & 0x0008)) {
+					OUT_BYTE(CLKSPD | mask, (high_16 + 0x11));
+				} else {
+					OUT_BYTE(CLKSPD & ~mask, (high_16 + 0x11));
+				}
+			} else { /* udma4 drive by itself */
+				OUT_BYTE(CLKSPD | mask, (high_16 + 0x11));
+			}
+		}
+	}
+
+	switch(drive_number) {
+		case 0:	drive_pci = 0x60;
+			pci_read_config_dword(dev, drive_pci, &drive_conf);
+			if ((drive_conf != 0x004ff304) && (drive_conf != 0x004ff3c4))
+				goto chipset_is_set;
+			pci_read_config_byte(dev, (drive_pci), &test1);
+			if (!(test1 & SYNC_ERRDY_EN))
+				pci_write_config_byte(dev, (drive_pci), test1|SYNC_ERRDY_EN);
+			break;
+		case 1:	drive_pci = 0x64;
+			pci_read_config_dword(dev, drive_pci, &drive_conf);
+			if ((drive_conf != 0x004ff304) && (drive_conf != 0x004ff3c4))
+				goto chipset_is_set;
+			pci_read_config_byte(dev, 0x60, &test1);
+			pci_read_config_byte(dev, (drive_pci), &test2);
+			if ((test1 & SYNC_ERRDY_EN) && !(test2 & SYNC_ERRDY_EN))
+				pci_write_config_byte(dev, (drive_pci), test2|SYNC_ERRDY_EN);
+			break;
+		case 2:	drive_pci = 0x68;
+			pci_read_config_dword(dev, drive_pci, &drive_conf);
+			if ((drive_conf != 0x004ff304) && (drive_conf != 0x004ff3c4))
+				goto chipset_is_set;
+			pci_read_config_byte(dev, (drive_pci), &test1);
+			if (!(test1 & SYNC_ERRDY_EN))
+				pci_write_config_byte(dev, (drive_pci), test1|SYNC_ERRDY_EN);
+			break;
+		case 3:	drive_pci = 0x6c;
+			pci_read_config_dword(dev, drive_pci, &drive_conf);
+			if ((drive_conf != 0x004ff304) && (drive_conf != 0x004ff3c4))
+				goto chipset_is_set;
+			pci_read_config_byte(dev, 0x68, &test1);
+			pci_read_config_byte(dev, (drive_pci), &test2);
+			if ((test1 & SYNC_ERRDY_EN) && !(test2 & SYNC_ERRDY_EN))
+				pci_write_config_byte(dev, (drive_pci), test2|SYNC_ERRDY_EN);
+			break;
+		default:
+			return ide_dma_off;
+	}
+
+chipset_is_set:
+
+	if (drive->media != ide_disk)
+		return ide_dma_off_quietly;
+
+	pci_read_config_byte(dev, (drive_pci), &AP);
+	pci_read_config_byte(dev, (drive_pci)|0x01, &BP);
+	pci_read_config_byte(dev, (drive_pci)|0x02, &CP);
+	pci_read_config_byte(dev, (drive_pci)|0x03, &DP);
+
+	if (id->capability & 4) {		/* IORDY_EN */
+		pci_write_config_byte(dev, (drive_pci), AP|IORDY_EN);
+		pci_read_config_byte(dev, (drive_pci), &AP);
+	}
+
+	if (drive->media == ide_disk) {		/* PREFETCH_EN */
+		pci_write_config_byte(dev, (drive_pci), AP|PREFETCH_EN);
+		pci_read_config_byte(dev, (drive_pci), &AP);
+	}
+
+	if ((BP & 0xF0) && (CP & 0x0F)) {
+		/* clear DMA modes of upper 842 bits of B Register */
+		/* clear PIO forced mode upper 1 bit of B Register */
+		pci_write_config_byte(dev, (drive_pci)|0x01, BP & ~0xF0);
+		pci_read_config_byte(dev, (drive_pci)|0x01, &BP);
+
+		/* clear DMA modes of lower 8421 bits of C Register */
+		pci_write_config_byte(dev, (drive_pci)|0x02, CP & ~0x0F);
+		pci_read_config_byte(dev, (drive_pci)|0x02, &CP);
+	}
+
+	pci_read_config_byte(dev, (drive_pci), &AP);
+	pci_read_config_byte(dev, (drive_pci)|0x01, &BP);
+	pci_read_config_byte(dev, (drive_pci)|0x02, &CP);
+
+	if ((id->dma_ultra & 0x0010) && (udma_66) && (udma_33)) {
+		/* speed 8 == UDMA mode 4 == speed 6 plus cable */
+		speed = XFER_UDMA_4; TB = 0x20; TC = 0x01;
+	} else if ((id->dma_ultra & 0x0008) && (udma_66) && (udma_33)) {
+		/* speed 7 == UDMA mode 3 == speed 5 plus cable */
+		speed = XFER_UDMA_3; TB = 0x40; TC = 0x02;
+	} else if ((id->dma_ultra & 0x0004) && (udma_33)) {
+		/* speed 6 == UDMA mode 2 */
+		speed = XFER_UDMA_2; TB = 0x20; TC = 0x01;
+	} else if ((id->dma_ultra & 0x0002) && (udma_33)) {
+		/* speed 5 == UDMA mode 1 */
+		speed = XFER_UDMA_1; TB = 0x40; TC = 0x02;
+	} else if ((id->dma_ultra & 0x0001) && (udma_33)) {
+		/* speed 4 == UDMA mode 0 */
+		speed = XFER_UDMA_0; TB = 0x60; TC = 0x03;
+	} else if (id->dma_mword & 0x0004) {
+		/* speed 4 == DMA mode 2 multi-word */
+		speed = XFER_MW_DMA_2; TB = 0x60; TC = 0x03;
+	} else if (id->dma_mword & 0x0002) {
+		/* speed 3 == DMA mode 1 multi-word */
+		speed = XFER_MW_DMA_1; TB = 0x60; TC = 0x04;
+	} else if (id->dma_mword & 0x0001) {
+		/* speed 2 == DMA mode 0 multi-word */
+		speed = XFER_MW_DMA_0; TB = 0x60; TC = 0x05;
+	} else if (id->dma_1word & 0x0004) {
+		/* speed 2 == DMA mode 2 single-word */
+		speed = XFER_SW_DMA_2; TB = 0x60; TC = 0x05;
+	} else if (id->dma_1word & 0x0002) {
+		/* speed 1 == DMA mode 1 single-word */
+		speed = XFER_SW_DMA_1; TB = 0x80; TC = 0x06;
+	} else if (id->dma_1word & 0x0001) {
+		/* speed 0 == DMA mode 0 single-word */
+		speed = XFER_SW_DMA_0; TB = 0xC0; TC = 0x0B;
+	} else {
+		/* restore original pci-config space */
+		pci_write_config_dword(dev, drive_pci, drive_conf);
+		return ide_dma_off_quietly;
+	}
+
+	pci_write_config_byte(dev, (drive_pci)|0x01, BP|TB);
+	pci_write_config_byte(dev, (drive_pci)|0x02, CP|TC);
+
+#if PDC202XX_DECODE_REGISTER_INFO
+	pci_read_config_byte(dev, (drive_pci), &AP);
+	pci_read_config_byte(dev, (drive_pci)|0x01, &BP);
+	pci_read_config_byte(dev, (drive_pci)|0x02, &CP);
+
+	decode_registers(REG_A, AP);
+	decode_registers(REG_B, BP);
+	decode_registers(REG_C, CP);
+	decode_registers(REG_D, DP);
+#endif /* PDC202XX_DECODE_REGISTER_INFO */
+
+	err = ide_config_drive_speed(drive, speed);
+
+#if PDC202XX_DEBUG_DRIVE_INFO
+	printk("%s: %s drive%d 0x%08x ",
+		drive->name, ide_xfer_verbose(speed),
+		drive_number, drive_conf);
+	pci_read_config_dword(dev, drive_pci, &drive_conf);
+	printk("0x%08x\n", drive_conf);
+#endif /* PDC202XX_DEBUG_DRIVE_INFO */
+
+	return ((int)	((id->dma_ultra >> 11) & 3) ? ide_dma_on :
+			((id->dma_ultra >> 8) & 7) ? ide_dma_on :
+			((id->dma_mword >> 8) & 7) ? ide_dma_on : 
+			((id->dma_1word >> 8) & 7) ? ide_dma_on :
+						     ide_dma_off_quietly);
+}
+
+/*   0    1    2    3    4    5    6   7   8
+ * 960, 480, 390, 300, 240, 180, 120, 90, 60
+ *           180, 150, 120,  90,  60
+ * DMA_Speed
+ * 180, 120,  90,  90,  90,  60,  30
+ *  11,   5,   4,   3,   2,   1,   0
+ */
+
+static int config_chipset_for_pio (ide_drive_t *drive, byte pio)
+{
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct pci_dev *dev	= hwif->pci_dev;
+	byte			drive_pci, speed;
+	byte			AP, BP, TA, TB;
+
+	int drive_number	= ((hwif->channel ? 2 : 0) + (drive->select.b.unit & 0x01));
+	int err;
+
+	switch (drive_number) {
+		case 0: drive_pci = 0x60;	break;
+		case 1: drive_pci = 0x64;	break;
+		case 2: drive_pci = 0x68;	break;
+		case 3: drive_pci = 0x6c;	break;
+		default:			return 1;
+	}
+
+        pci_read_config_byte(dev, (drive_pci), &AP);
+        pci_read_config_byte(dev, (drive_pci)|0x01, &BP);
+
+
+        if ((AP & 0x0F) || (BP & 0x07)) {
+		/* clear PIO modes of lower 8421 bits of A Register */
+		pci_write_config_byte(dev, (drive_pci), AP & ~0x0F);
+		pci_read_config_byte(dev, (drive_pci), &AP);
+
+		/* clear PIO modes of lower 421 bits of B Register */
+		pci_write_config_byte(dev, (drive_pci)|0x01, BP & ~0x07);
+		pci_read_config_byte(dev, (drive_pci)|0x01, &BP);
+
+		pci_read_config_byte(dev, (drive_pci), &AP);
+		pci_read_config_byte(dev, (drive_pci)|0x01, &BP);
+	}
+
+	pio = (pio == 5) ? 4 : pio;
+	switch (ide_get_best_pio_mode(drive, 255, pio, NULL)) {
+		case 4:  speed = XFER_PIO_4; TA=0x01; TB=0x04; break;
+		case 3:  speed = XFER_PIO_3; TA=0x02; TB=0x06; break;
+		case 2:  speed = XFER_PIO_2; TA=0x03; TB=0x08; break;
+		case 1:  speed = XFER_PIO_1; TA=0x05; TB=0x0C; break;
+		case 0:
+		default: speed = XFER_PIO_0; TA=0x09; TB=0x13; break;
+	}
+	pci_write_config_byte(dev, (drive_pci), AP|TA);
+	pci_write_config_byte(dev, (drive_pci)|0x01, BP|TB);
+
+#if PDC202XX_DECODE_REGISTER_INFO
+	pci_read_config_byte(dev, (drive_pci), &AP);
+	pci_read_config_byte(dev, (drive_pci)|0x01, &BP);
+	pci_read_config_byte(dev, (drive_pci)|0x02, &CP);
+	pci_read_config_byte(dev, (drive_pci)|0x03, &DP);
+
+	decode_registers(REG_A, AP);
+	decode_registers(REG_B, BP);
+	decode_registers(REG_C, CP);
+	decode_registers(REG_D, DP);
+#endif /* PDC202XX_DECODE_REGISTER_INFO */
+
+	err = ide_config_drive_speed(drive, speed);
+
+#if PDC202XX_DEBUG_DRIVE_INFO
+	printk("%s: %s drive%d 0x%08x ",
+		drive->name, ide_xfer_verbose(speed),
+		drive_number, drive_conf);
+	pci_read_config_dword(dev, drive_pci, &drive_conf);
+	printk("0x%08x\n", drive_conf);
+#endif /* PDC202XX_DEBUG_DRIVE_INFO */
+
+	return err;
+}
+
+static void pdc202xx_tune_drive (ide_drive_t *drive, byte pio)
+{
+	(void) config_chipset_for_pio(drive, pio);
+}
+
+static int config_drive_xfer_rate (ide_drive_t *drive)
+{
+	struct hd_driveid *id = drive->id;
+	ide_hwif_t *hwif = HWIF(drive);
+	ide_dma_action_t dma_func = ide_dma_off_quietly;
+
+	if (id && (id->capability & 1) && hwif->autodma) {
+		/* Consult the list of known "bad" drives */
+		if (ide_dmaproc(ide_dma_bad_drive, drive)) {
+			dma_func = ide_dma_off;
+			goto fast_ata_pio;
+		}
+		dma_func = ide_dma_off_quietly;
+		if (id->field_valid & 4) {
+			if (id->dma_ultra & 0x001F) {
+				/* Force if Capable UltraDMA */
+				dma_func = config_chipset_for_dma(drive, 1);
+				if ((id->field_valid & 2) &&
+				    (dma_func != ide_dma_on))
+					goto try_dma_modes;
+			}
+		} else if (id->field_valid & 2) {
+try_dma_modes:
+			if ((id->dma_mword & 0x0007) ||
+			    (id->dma_1word & 0x0007)) {
+				/* Force if Capable regular DMA modes */
+				dma_func = config_chipset_for_dma(drive, 0);
+				if (dma_func != ide_dma_on)
+					goto no_dma_set;
+			}
+		} else if (ide_dmaproc(ide_dma_good_drive, drive)) {
+			if (id->eide_dma_time > 150) {
+				goto no_dma_set;
+			}
+			/* Consult the list of known "good" drives */
+			dma_func = config_chipset_for_dma(drive, 0);
+			if (dma_func != ide_dma_on)
+				goto no_dma_set;
+		} else {
+			goto fast_ata_pio;
+		}
+	} else if ((id->capability & 8) || (id->field_valid & 2)) {
+fast_ata_pio:
+		dma_func = ide_dma_off_quietly;
+no_dma_set:
+		(void) config_chipset_for_pio(drive, 5);
+	}
+
+	return HWIF(drive)->dmaproc(dma_func, drive);
+}
+
+/*
+ * pdc202xx_dmaproc() initiates/aborts (U)DMA read/write operations on a drive.
+ */
+int pdc202xx_dmaproc (ide_dma_action_t func, ide_drive_t *drive)
+{
+	switch (func) {
+		case ide_dma_check:
+			return config_drive_xfer_rate(drive);
+		default:
+			break;
+	}
+	return ide_dmaproc(func, drive);	/* use standard DMA stuff */
+}
+
+unsigned int __init pci_init_pdc202xx (struct pci_dev *dev, const char *name)
+{
+	unsigned long high_16	= dev->resource[4].start & PCI_BASE_ADDRESS_IO_MASK;
+	byte udma_speed_flag	= inb(high_16 + 0x001f);
+	byte primary_mode	= inb(high_16 + 0x001a);
+	byte secondary_mode	= inb(high_16 + 0x001b);
+
+	if (dev->device == PCI_DEVICE_ID_PROMISE_20262) {
+		int i = 0;
+		/*
+		 * software reset -  this is required because the bios
+		 * will set UDMA timing on if the hdd supports it. The
+		 * user may want to turn udma off. A bug in the pdc20262
+		 * is that it cannot handle a downgrade in timing from UDMA
+		 * to DMA. Disk accesses after issuing a set feature command
+		 * will result in errors. A software reset leaves the timing
+		 * registers intact, but resets the drives.
+		 */
+
+		OUT_BYTE(udma_speed_flag | 0x10, high_16 + 0x001f);
+		ide_delay_50ms();
+		ide_delay_50ms();
+		OUT_BYTE(udma_speed_flag & ~0x10, high_16 + 0x001f);
+		for (i=0; i<40; i++)
+			ide_delay_50ms();
+	}
+
+	if (dev->resource[PCI_ROM_RESOURCE].start) {
+		pci_write_config_dword(dev, PCI_ROM_ADDRESS, dev->resource[PCI_ROM_RESOURCE].start | PCI_ROM_ADDRESS_ENABLE);
+		printk("%s: ROM enabled at 0x%08lx\n", name, dev->resource[PCI_ROM_RESOURCE].start);
+	}
+
+	if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE) {
+		byte irq = 0, irq2 = 0;
+		pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
+		pci_read_config_byte(dev, (PCI_INTERRUPT_LINE)|0x80, &irq2);	/* 0xbc */
+		if (irq != irq2) {
+			pci_write_config_byte(dev, (PCI_INTERRUPT_LINE)|0x80, irq);	/* 0xbc */
+			printk("%s: pci-config space interrupt mirror fixed.\n", name);
+		}
+	}
+
+	printk("%s: (U)DMA Burst Bit %sABLED " \
+		"Primary %s Mode " \
+		"Secondary %s Mode.\n",
+		name,
+		(udma_speed_flag & 1) ? "EN" : "DIS",
+		(primary_mode & 1) ? "MASTER" : "PCI",
+		(secondary_mode & 1) ? "MASTER" : "PCI" );
+
+#ifdef CONFIG_PDC202XX_BURST
+	if (!(udma_speed_flag & 1)) {
+		printk("%s: FORCING BURST BIT 0x%02x -> 0x%02x ", name, udma_speed_flag, (udma_speed_flag|1));
+		outb(udma_speed_flag|1, high_16 + 0x001f);
+		printk("%sCTIVE\n", (inb(high_16 + 0x001f) & 1) ? "A" : "INA");
+	}
+#endif /* CONFIG_PDC202XX_BURST */
+
+#ifdef CONFIG_PDC202XX_MASTER
+	if (!(primary_mode & 1)) {
+		printk("%s: FORCING PRIMARY MODE BIT 0x%02x -> 0x%02x ",
+			name, primary_mode, (primary_mode|1));
+		outb(primary_mode|1, high_16 + 0x001a);
+		printk("%s\n", (inb(high_16 + 0x001a) & 1) ? "MASTER" : "PCI");
+	}
+
+	if (!(secondary_mode & 1)) {
+		printk("%s: FORCING SECONDARY MODE BIT 0x%02x -> 0x%02x ",
+			name, secondary_mode, (secondary_mode|1));
+		outb(secondary_mode|1, high_16 + 0x001b);
+		printk("%s\n", (inb(high_16 + 0x001b) & 1) ? "MASTER" : "PCI");
+	}
+#endif /* CONFIG_PDC202XX_MASTER */
+
+#if defined(DISPLAY_PDC202XX_TIMINGS) && defined(CONFIG_PROC_FS)
+        pdc202xx_proc = 1;
+        bmide_dev = dev;
+        pdc202xx_display_info = &pdc202xx_get_info;
+#endif /* DISPLAY_PDC202XX_TIMINGS && CONFIG_PROC_FS */
+
+	return dev->irq;
+}
+
+unsigned int __init ata66_pdc202xx (ide_hwif_t *hwif)
+{
+	unsigned short mask = (hwif->channel) ? (1<<11) : (1<<10);
+	unsigned short CIS;
+
+	pci_read_config_word(hwif->pci_dev, 0x50, &CIS);
+        return ((CIS & mask) ? 0 : 1);
+}
+
+void __init ide_init_pdc202xx (ide_hwif_t *hwif)
+{
+	hwif->tuneproc = &pdc202xx_tune_drive;
+
+	if (hwif->dma_base) {
+		hwif->dmaproc = &pdc202xx_dmaproc;
+	} else {
+		hwif->drives[0].autotune = 1;
+		hwif->drives[1].autotune = 1;
+	}
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)