patch-2.3.99-pre1 linux/drivers/block/pdc4030.c

• Lines: 553
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.51/linux/drivers/block/pdc4030.c
• Orig date: Sat Feb 26 22:31:44 2000

diff -u --recursive --new-file v2.3.51/linux/drivers/block/pdc4030.c linux/drivers/block/pdc4030.c
@@ -1,552 +0,0 @@
-/*  -*- linux-c -*-
- *  linux/drivers/ide/pdc4030.c		Version 0.90  May 27, 1999
- *
- *  Copyright (C) 1995-1999  Linus Torvalds & authors (see below)
- */
-
-/*
- *  Principal Author/Maintainer:  peterd@pnd-pc.demon.co.uk
- *
- *  This file provides support for the second port and cache of Promise
- *  IDE interfaces, e.g. DC4030VL, DC4030VL-1 and DC4030VL-2.
- *
- *  Thanks are due to Mark Lord for advice and patiently answering stupid
- *  questions, and all those mugs^H^H^H^Hbrave souls who've tested this,
- *  especially Andre Hedrick.
- *
- *  Version 0.01	Initial version, #include'd in ide.c rather than
- *                      compiled separately.
- *                      Reads use Promise commands, writes as before. Drives
- *                      on second channel are read-only.
- *  Version 0.02        Writes working on second channel, reads on both
- *                      channels. Writes fail under high load. Suspect
- *			transfers of >127 sectors don't work.
- *  Version 0.03        Brought into line with ide.c version 5.27.
- *                      Other minor changes.
- *  Version 0.04        Updated for ide.c version 5.30
- *                      Changed initialization strategy
- *  Version 0.05	Kernel integration.  -ml
- *  Version 0.06	Ooops. Add hwgroup to direct call of ide_intr() -ml
- *  Version 0.07	Added support for DC4030 variants
- *			Secondary interface autodetection
- *  Version 0.08	Renamed to pdc4030.c
- *  Version 0.09	Obsolete - never released - did manual write request
- *			splitting before max_sectors[major][minor] available.
- *  Version 0.10	Updated for 2.1 series of kernels
- *  Version 0.11	Updated for 2.3 series of kernels
- *			Autodetection code added.
- *
- *  Version 0.90	Transition to BETA code. No lost/unexpected interrupts
- */
-
-/*
- * Once you've compiled it in, you'll have to also enable the interface
- * setup routine from the kernel command line, as in 
- *
- *	'linux ide0=dc4030' or 'linux ide1=dc4030'
- *
- * It should now work as a second controller also ('ide1=dc4030') but only
- * if you DON'T have BIOS V4.44, which has a bug. If you have this version
- * and EPROM programming facilities, you need to fix 4 bytes:
- * 	2496:	81	81
- *	2497:	3E	3E
- *	2498:	22	98	*
- *	2499:	06	05	*
- *	249A:	F0	F0
- *	249B:	01	01
- *	...
- *	24A7:	81	81
- *	24A8:	3E	3E
- *	24A9:	22	98	*
- *	24AA:	06	05	*
- *	24AB:	70	70
- *	24AC:	01	01
- *
- * As of January 1999, Promise Technology Inc. have finally supplied me with
- * some technical information which has shed a glimmer of light on some of the
- * problems I was having, especially with writes. 
- *
- * There are still problems with the robustness and efficiency of this driver
- * because I still don't understand what the card is doing with interrupts.
- */
-
-#define DEBUG_READ
-#define DEBUG_WRITE
-
-#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/ide.h>
-
-#include <asm/io.h>
-#include <asm/irq.h>
-
-#include "pdc4030.h"
-
-/*
- * promise_selectproc() is invoked by ide.c
- * in preparation for access to the specified drive.
- */
-static void promise_selectproc (ide_drive_t *drive)
-{
-	unsigned int number;
-
-	number = (HWIF(drive)->channel << 1) + drive->select.b.unit;
-	OUT_BYTE(number,IDE_FEATURE_REG);
-}
-
-/*
- * pdc4030_cmd handles the set of vendor specific commands that are initiated
- * by command F0. They all have the same success/failure notification -
- * 'P' (=0x50) on success, 'p' (=0x70) on failure.
- */
-int pdc4030_cmd(ide_drive_t *drive, byte cmd)
-{
-	unsigned long timeout, timer;
-	byte status_val;
-
-	promise_selectproc(drive);	/* redundant? */
-	OUT_BYTE(0xF3,IDE_SECTOR_REG);
-	OUT_BYTE(cmd,IDE_SELECT_REG);
-	OUT_BYTE(PROMISE_EXTENDED_COMMAND,IDE_COMMAND_REG);
-	timeout = HZ * 10;
-	timeout += jiffies;
-	do {
-		if(time_after(jiffies, timeout)) {
-			return 2; /* device timed out */
-		}
-		/* This is out of delay_10ms() */
-		/* Delays at least 10ms to give interface a chance */
-		timer = jiffies + (HZ + 99)/100 + 1;
-		while (time_after(timer, jiffies));
-		status_val = IN_BYTE(IDE_SECTOR_REG);
-	} while (status_val != 0x50 && status_val != 0x70);
-
-	if(status_val == 0x50)
-		return 0; /* device returned success */
-	else
-		return 1; /* device returned failure */
-}
-
-/*
- * pdc4030_identify sends a vendor-specific IDENTIFY command to the drive
- */
-int pdc4030_identify(ide_drive_t *drive)
-{
-	return pdc4030_cmd(drive, PROMISE_IDENTIFY);
-}
-
-int enable_promise_support = 0;
-
-void __init init_pdc4030 (void)
-{
-	enable_promise_support = 1;
-}
-
-/*
- * setup_pdc4030()
- * Completes the setup of a Promise DC4030 controller card, once found.
- */
-int __init setup_pdc4030 (ide_hwif_t *hwif)
-{
-        ide_drive_t *drive;
-	ide_hwif_t *hwif2;
-	struct dc_ident ident;
-	int i;
-	ide_startstop_t startstop;
-	
-	if (!hwif) return 0;
-
-	drive = &hwif->drives[0];
-	hwif2 = &ide_hwifs[hwif->index+1];
-	if (hwif->chipset == ide_pdc4030) /* we've already been found ! */
-		return 1;
-
-	if (IN_BYTE(IDE_NSECTOR_REG) == 0xFF || IN_BYTE(IDE_SECTOR_REG) == 0xFF) {
-		return 0;
-	}
-	if (IDE_CONTROL_REG)
-		OUT_BYTE(0x08,IDE_CONTROL_REG);
-	if (pdc4030_cmd(drive,PROMISE_GET_CONFIG)) {
-		return 0;
-	}
-	if (ide_wait_stat(&startstop, drive,DATA_READY,BAD_W_STAT,WAIT_DRQ)) {
-		printk(KERN_INFO
-			"%s: Failed Promise read config!\n",hwif->name);
-		return 0;
-	}
-	ide_input_data(drive,&ident,SECTOR_WORDS);
-	if (ident.id[1] != 'P' || ident.id[0] != 'T') {
-		return 0;
-	}
-	printk(KERN_INFO "%s: Promise caching controller, ",hwif->name);
-	switch(ident.type) {
-		case 0x43:	printk("DC4030VL-2, "); break;
-		case 0x41:	printk("DC4030VL-1, "); break;
-		case 0x40:	printk("DC4030VL, "); break;
-		default:
-			printk("unknown - type 0x%02x - please report!\n"
-			       ,ident.type);
-			printk("Please e-mail the following data to "
-			       "promise@pnd-pc.demon.co.uk along with\n"
-			       "a description of your card and drives:\n");
-			for (i=0; i < 0x90; i++) {
-				printk("%02x ", ((unsigned char *)&ident)[i]);
-				if ((i & 0x0f) == 0x0f) printk("\n");
-			}
-			return 0;
-	}
-	printk("%dKB cache, ",(int)ident.cache_mem);
-	switch(ident.irq) {
-            case 0x00: hwif->irq = 14; break;
-            case 0x01: hwif->irq = 12; break;
-            default:   hwif->irq = 15; break;
-	}
-	printk("on IRQ %d\n",hwif->irq);
-
-	/*
-	 * Once found and identified, we set up the next hwif in the array
-	 * (hwif2 = ide_hwifs[hwif->index+1]) with the same io ports, irq
-	 * and other settings as the main hwif. This gives us two "mated"
-	 * hwifs pointing to the Promise card.
-	 *
-	 * We also have to shift the default values for the remaining
-	 * interfaces "up by one" to make room for the second interface on the
-	 * same set of values.
-	 */
-
-	hwif->chipset	= hwif2->chipset = ide_pdc4030;
-	hwif->mate	= hwif2;
-	hwif2->mate	= hwif;
-	hwif2->channel	= 1;
-	hwif->selectproc = hwif2->selectproc = &promise_selectproc;
-	hwif->serialized = hwif2->serialized = 1;
-
-/* Shift the remaining interfaces down by one */
-	for (i=MAX_HWIFS-1 ; i > hwif->index+1 ; i--) {
-		ide_hwif_t *h = &ide_hwifs[i];
-
-#ifdef DEBUG
-		printk(KERN_DEBUG "Shifting i/f %d values to i/f %d\n",i-1,i);
-#endif
-		ide_init_hwif_ports(&h->hw, (h-1)->io_ports[IDE_DATA_OFFSET], 0, NULL);
-		memcpy(h->io_ports, h->hw.io_ports, sizeof(h->io_ports));
-		h->noprobe = (h-1)->noprobe;
-	}
-	ide_init_hwif_ports(&hwif2->hw, hwif->io_ports[IDE_DATA_OFFSET], 0, NULL);
-	memcpy(hwif2->io_ports, hwif->hw.io_ports, sizeof(hwif2->io_ports));
-	hwif2->irq = hwif->irq;
-	hwif2->hw.irq = hwif->hw.irq = hwif->irq;
-	for (i=0; i<2 ; i++) {
-		hwif->drives[i].io_32bit = 3;
-		hwif2->drives[i].io_32bit = 3;
-		hwif->drives[i].keep_settings = 1;
-		hwif2->drives[i].keep_settings = 1;
-		if (!ident.current_tm[i].cyl)
-			hwif->drives[i].noprobe = 1;
-		if (!ident.current_tm[i+2].cyl)
-			hwif2->drives[i].noprobe = 1;
-	}
-        return 1;
-}
-
-/*
- * detect_pdc4030()
- * Tests for the presence of a DC4030 Promise card on this interface
- * Returns: 1 if found, 0 if not found
- */
-int __init detect_pdc4030(ide_hwif_t *hwif)
-{
-	ide_drive_t *drive = &hwif->drives[0];
-
-	if (IDE_DATA_REG == 0) { /* Skip test for non-existent interface */
-		return 0;
-	}
-	OUT_BYTE(0xF3, IDE_SECTOR_REG);
-	OUT_BYTE(0x14, IDE_SELECT_REG);
-	OUT_BYTE(PROMISE_EXTENDED_COMMAND, IDE_COMMAND_REG);
-	
-	ide_delay_50ms();
-
-	if (IN_BYTE(IDE_ERROR_REG) == 'P' &&
-	    IN_BYTE(IDE_NSECTOR_REG) == 'T' &&
-	    IN_BYTE(IDE_SECTOR_REG) == 'I') {
-		return 1;
-	} else {
-		return 0;
-	}
-}
-
-void __init ide_probe_for_pdc4030(void)
-{
-	unsigned int	index;
-	ide_hwif_t	*hwif;
-
-	if (enable_promise_support == 0)
-		return;
-	for (index = 0; index < MAX_HWIFS; index++) {
-		hwif = &ide_hwifs[index];
-		if (hwif->chipset == ide_unknown && detect_pdc4030(hwif)) {
-			setup_pdc4030(hwif);
-		}
-	}
-}
-
-
-
-/*
- * promise_read_intr() is the handler for disk read/multread interrupts
- */
-static ide_startstop_t promise_read_intr (ide_drive_t *drive)
-{
-	byte stat;
-	int total_remaining;
-	unsigned int sectors_left, sectors_avail, nsect;
-	struct request *rq;
-
-	if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
-		return ide_error(drive, "promise_read_intr", stat);
-	}
-
-read_again:
-	do {
-		sectors_left = IN_BYTE(IDE_NSECTOR_REG);
-		IN_BYTE(IDE_SECTOR_REG);
-	} while (IN_BYTE(IDE_NSECTOR_REG) != sectors_left);
-	rq = HWGROUP(drive)->rq;
-	sectors_avail = rq->nr_sectors - sectors_left;
-	if (!sectors_avail)
-		goto read_again;
-
-read_next:
-	rq = HWGROUP(drive)->rq;
-	nsect = rq->current_nr_sectors;
-	if (nsect > sectors_avail)
-		nsect = sectors_avail;
-	sectors_avail -= nsect;
-	ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
-#ifdef DEBUG_READ
-	printk(KERN_DEBUG "%s:  promise_read: sectors(%ld-%ld), "
-	       "buf=0x%08lx, rem=%ld\n", drive->name, rq->sector,
-	       rq->sector+nsect-1, (unsigned long) rq->buffer,
-	       rq->nr_sectors-nsect);
-#endif
-	rq->sector += nsect;
-	rq->buffer += nsect<<9;
-	rq->errors = 0;
-	rq->nr_sectors -= nsect;
-	total_remaining = rq->nr_sectors;
-	if ((rq->current_nr_sectors -= nsect) <= 0) {
-		ide_end_request(1, HWGROUP(drive));
-	}
-/*
- * Now the data has been read in, do the following:
- * 
- * if there are still sectors left in the request, 
- *   if we know there are still sectors available from the interface,
- *     go back and read the next bit of the request.
- *   else if DRQ is asserted, there are more sectors available, so
- *     go back and find out how many, then read them in.
- *   else if BUSY is asserted, we are going to get an interrupt, so
- *     set the handler for the interrupt and just return
- */
-	if (total_remaining > 0) {
-		if (sectors_avail)
-			goto read_next;
-		stat = GET_STAT();
-		if (stat & DRQ_STAT)
-			goto read_again;
-		if (stat & BUSY_STAT) {
-			ide_set_handler (drive, &promise_read_intr, WAIT_CMD, NULL);
-#ifdef DEBUG_READ
-			printk(KERN_DEBUG "%s: promise_read: waiting for"
-			       "interrupt\n", drive->name);
-#endif 
-			return ide_started;
-		}
-		printk(KERN_ERR "%s: Eeek! promise_read_intr: sectors left "
-		       "!DRQ !BUSY\n", drive->name);
-		return ide_error(drive, "promise read intr", stat);
-	}
-	return ide_stopped;
-}
-
-/*
- * promise_complete_pollfunc()
- * This is the polling function for waiting (nicely!) until drive stops
- * being busy. It is invoked at the end of a write, after the previous poll
- * has finished.
- *
- * Once not busy, the end request is called.
- */
-static ide_startstop_t promise_complete_pollfunc(ide_drive_t *drive)
-{
-	ide_hwgroup_t *hwgroup = HWGROUP(drive);
-	struct request *rq = hwgroup->rq;
-	int i;
-
-	if (GET_STAT() & BUSY_STAT) {
-		if (time_before(jiffies, hwgroup->poll_timeout)) {
-			ide_set_handler(drive, &promise_complete_pollfunc, HZ/100, NULL);
-			return ide_started; /* continue polling... */
-		}
-		hwgroup->poll_timeout = 0;
-		printk(KERN_ERR "%s: completion timeout - still busy!\n",
-		       drive->name);
-		return ide_error(drive, "busy timeout", GET_STAT());
-	}
-
-	hwgroup->poll_timeout = 0;
-#ifdef DEBUG_WRITE
-	printk(KERN_DEBUG "%s: Write complete - end_request\n", drive->name);
-#endif
-	for (i = rq->nr_sectors; i > 0; ) {
-		i -= rq->current_nr_sectors;
-		ide_end_request(1, hwgroup);
-	}
-	return ide_stopped;
-}
-
-/*
- * promise_write_pollfunc() is the handler for disk write completion polling.
- */
-static ide_startstop_t promise_write_pollfunc (ide_drive_t *drive)
-{
-	ide_hwgroup_t *hwgroup = HWGROUP(drive);
-
-	if (IN_BYTE(IDE_NSECTOR_REG) != 0) {
-		if (time_before(jiffies, hwgroup->poll_timeout)) {
-			ide_set_handler (drive, &promise_write_pollfunc, HZ/100, NULL);
-			return ide_started; /* continue polling... */
-		}
-		hwgroup->poll_timeout = 0;
-		printk(KERN_ERR "%s: write timed-out!\n",drive->name);
-		return ide_error (drive, "write timeout", GET_STAT());
-	}
-
-	/*
-	 * Now write out last 4 sectors and poll for not BUSY
-	 */
-	ide_multwrite(drive, 4);
-	hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
-	ide_set_handler(drive, &promise_complete_pollfunc, HZ/100, NULL);
-#ifdef DEBUG_WRITE
-	printk(KERN_DEBUG "%s: Done last 4 sectors - status = %02x\n",
-		drive->name, GET_STAT());
-#endif
-	return ide_started;
-}
-
-/*
- * promise_write() transfers a block of one or more sectors of data to a
- * drive as part of a disk write operation. All but 4 sectors are transfered
- * in the first attempt, then the interface is polled (nicely!) for completion
- * before the final 4 sectors are transfered. There is no interrupt generated
- * on writes (at least on the DC4030VL-2), we just have to poll for NOT BUSY.
- */
-static ide_startstop_t promise_write (ide_drive_t *drive)
-{
-	ide_hwgroup_t *hwgroup = HWGROUP(drive);
-	struct request *rq = &hwgroup->wrq;
-
-#ifdef DEBUG_WRITE
-	printk(KERN_DEBUG "%s: promise_write: sectors(%ld-%ld), "
-	       "buffer=0x%08x\n", drive->name, rq->sector,
-	       rq->sector + rq->nr_sectors - 1, (unsigned int)rq->buffer);
-#endif
-
-	/*
-	 * If there are more than 4 sectors to transfer, do n-4 then go into
-	 * the polling strategy as defined above.
-	 */
-	if (rq->nr_sectors > 4) {
-		if (ide_multwrite(drive, rq->nr_sectors - 4))
-			return ide_stopped;
-		hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
-		ide_set_handler (drive, &promise_write_pollfunc, HZ/100, NULL);
-		return ide_started;
-	} else {
-	/*
-	 * There are 4 or fewer sectors to transfer, do them all in one go
-	 * and wait for NOT BUSY.
-	 */
-		if (ide_multwrite(drive, rq->nr_sectors))
-			return ide_stopped;
-		hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
-		ide_set_handler(drive, &promise_complete_pollfunc, HZ/100, NULL);
-#ifdef DEBUG_WRITE
-		printk(KERN_DEBUG "%s: promise_write: <= 4 sectors, "
-			"status = %02x\n", drive->name, GET_STAT());
-#endif
-		return ide_started;
-	}
-}
-
-/*
- * do_pdc4030_io() is called from do_rw_disk, having had the block number
- * already set up. It issues a READ or WRITE command to the Promise
- * controller, assuming LBA has been used to set up the block number.
- */
-ide_startstop_t do_pdc4030_io (ide_drive_t *drive, struct request *rq)
-{
-	unsigned long timeout;
-	byte stat;
-
-	if (rq->cmd == READ) {
-		OUT_BYTE(PROMISE_READ, IDE_COMMAND_REG);
-/*
- * The card's behaviour is odd at this point. If the data is
- * available, DRQ will be true, and no interrupt will be
- * generated by the card. If this is the case, we need to call the 
- * "interrupt" handler (promise_read_intr) directly. Otherwise, if
- * an interrupt is going to occur, bit0 of the SELECT register will
- * be high, so we can set the handler the just return and be interrupted.
- * If neither of these is the case, we wait for up to 50ms (badly I'm
- * afraid!) until one of them is.
- */
-		timeout = jiffies + HZ/20; /* 50ms wait */
-		do {
-			stat=GET_STAT();
-			if (stat & DRQ_STAT) {
-				udelay(1);
-				return promise_read_intr(drive);
-			}
-			if (IN_BYTE(IDE_SELECT_REG) & 0x01) {
-#ifdef DEBUG_READ
-				printk(KERN_DEBUG "%s: read: waiting for "
-				                  "interrupt\n", drive->name);
-#endif
-				ide_set_handler(drive, &promise_read_intr, WAIT_CMD, NULL);
-				return ide_started;
-			}
-			udelay(1);
-		} while (time_before(jiffies, timeout));
-
-		printk(KERN_ERR "%s: reading: No DRQ and not waiting - Odd!\n",
-			drive->name);
-		return ide_stopped;
-	} else if (rq->cmd == WRITE) {
-		ide_startstop_t startstop;
-		OUT_BYTE(PROMISE_WRITE, IDE_COMMAND_REG);
-		if (ide_wait_stat(&startstop, drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
-			printk(KERN_ERR "%s: no DRQ after issuing "
-			       "PROMISE_WRITE\n", drive->name);
-			return startstop;
-	    	}
-		if (!drive->unmask)
-			__cli();	/* local CPU only */
-		HWGROUP(drive)->wrq = *rq; /* scratchpad */
-		return promise_write(drive);
-
-	} else {
-		printk("KERN_WARNING %s: bad command: %d\n",
-		       drive->name, rq->cmd);
-		ide_end_request(0, HWGROUP(drive));
-		return ide_stopped;
-	}
-}