patch-2.1.68 linux/drivers/block/promise.c

• Lines: 363
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.1.67/linux/drivers/block/promise.c
• Orig date: Wed Nov 6 04:49:33 1996

diff -u --recursive --new-file v2.1.67/linux/drivers/block/promise.c linux/drivers/block/promise.c
@@ -1,362 +0,0 @@
-/*  -*- linux-c -*-
- *  linux/drivers/block/promise.c	Version 0.07  Mar 26, 1996
- *
- *  Copyright (C) 1995-1996  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. DC4030, DC5030.
- *
- *  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.
- *
- *  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
- */
-
-/*
- * 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'
- *
- * As before, it seems that somewhere around 3Megs when writing, bad things
- * start to happen [timeouts/retries -ml]. If anyone can give me more feedback,
- * I'd really appreciate it.  [email: peterd@pnd-pc.demon.co.uk]
- *
- */
-
-
-#undef REALLY_SLOW_IO		/* most systems can safely undef this */
-
-#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 <asm/io.h>
-#include <asm/irq.h>
-#include "ide.h"
-#include "promise.h"
-
-/* This is needed as the controller may not interrupt if the required data is
-available in the cache. We have to simulate an interrupt. Ugh! */
-
-extern void ide_intr(int, void *dev_id, struct pt_regs*);
-
-/*
- * 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;
-
-	OUT_BYTE(drive->select.all,IDE_SELECT_REG);
-	udelay(1);	/* paranoia */
-	number = ((HWIF(drive)->is_promise2)<<1) + drive->select.b.unit;
-	OUT_BYTE(number,IDE_FEATURE_REG);
-}
-
-/*
- * promise_cmd handles the set of vendor specific commands that are initiated
- * by command F0. They all have the same success/failure notification.
- */
-int promise_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(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 (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 */
-}
-
-ide_hwif_t *hwif_required = NULL;
-
-void setup_dc4030 (ide_hwif_t *hwif)
-{
-    hwif_required = hwif;
-}
-
-/*
-init_dc4030: Test for presence of a Promise caching controller card.
-Returns: 0 if no Promise card present at this io_base
-	 1 if Promise card found
-*/
-int init_dc4030 (void)
-{
-	ide_hwif_t *hwif = hwif_required;
-        ide_drive_t *drive;
-	ide_hwif_t *second_hwif;
-	struct dc_ident ident;
-	int i;
-	
-	if (!hwif) return 0;
-
-	drive = &hwif->drives[0];
-	second_hwif = &ide_hwifs[hwif->index+1];
-	if(hwif->is_promise2) /* we've already been found ! */
-	    return 1;
-
-	if(IN_BYTE(IDE_NSECTOR_REG) == 0xFF || IN_BYTE(IDE_SECTOR_REG) == 0xFF)
-	{
-	    return 0;
-	}
-	OUT_BYTE(0x08,IDE_CONTROL_REG);
-	if(promise_cmd(drive,PROMISE_GET_CONFIG)) {
-	    return 0;
-	}
-	if(ide_wait_stat(drive,DATA_READY,BAD_W_STAT,WAIT_DRQ)) {
-	    printk("%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("%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);
-			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);
-	hwif->chipset    = second_hwif->chipset    = ide_promise;
-	hwif->selectproc = second_hwif->selectproc = &promise_selectproc;
-/* Shift the remaining interfaces down by one */
-	for (i=MAX_HWIFS-1 ; i > hwif->index+1 ; i--) {
-		ide_hwif_t *h = &ide_hwifs[i];
-
-		printk("Shifting i/f %d values to i/f %d\n",i-1,i);
-		ide_init_hwif_ports(h->io_ports, (h-1)->io_ports[IDE_DATA_OFFSET], NULL);
-		h->io_ports[IDE_CONTROL_OFFSET] = (h-1)->io_ports[IDE_CONTROL_OFFSET];
-		h->noprobe = (h-1)->noprobe;
-	}
-	second_hwif->is_promise2 = 1;
-	ide_init_hwif_ports(second_hwif->io_ports, hwif->io_ports[IDE_DATA_OFFSET], NULL);
-	second_hwif->io_ports[IDE_CONTROL_OFFSET] = hwif->io_ports[IDE_CONTROL_OFFSET];
-	second_hwif->irq = hwif->irq;
-	for (i=0; i<2 ; i++) {
-            hwif->drives[i].io_32bit = 3;
-	    second_hwif->drives[i].io_32bit = 3;
-	    if(!ident.current_tm[i+2].cyl) second_hwif->drives[i].noprobe=1;
-	}
-        return 1;
-}
-
-/*
- * promise_read_intr() is the handler for disk read/multread interrupts
- */
-static void promise_read_intr (ide_drive_t *drive)
-{
-	byte stat;
-	int i;
-	unsigned int sectors_left, sectors_avail, nsect;
-	struct request *rq;
-
-	if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
-		ide_error(drive, "promise_read_intr", stat);
-		return;
-	}
-
-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;
-
-read_next:
-	rq = HWGROUP(drive)->rq;
-	if ((nsect = rq->current_nr_sectors) > sectors_avail)
-		nsect = sectors_avail;
-	sectors_avail -= nsect;
-	ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
-#ifdef DEBUG
-	printk("%s:  promise_read: sectors(%ld-%ld), buffer=0x%08lx, "
-	       "remaining=%ld\n", drive->name, rq->sector, rq->sector+nsect-1, 
-	       (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
-#endif
-	rq->sector += nsect;
-	rq->buffer += nsect<<9;
-	rq->errors = 0;
-	i = (rq->nr_sectors -= nsect);
-	if ((rq->current_nr_sectors -= nsect) <= 0)
-		ide_end_request(1, HWGROUP(drive));
-	if (i > 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);
-		    return;
-		}
-		printk("Ah! promise read intr: sectors left !DRQ !BUSY\n");
-		ide_error(drive, "promise read intr", stat);
-	}
-}
-
-/*
- * promise_write_pollfunc() is the handler for disk write completion polling.
- */
-static void promise_write_pollfunc (ide_drive_t *drive)
-{
-	int i;
-	ide_hwgroup_t *hwgroup = HWGROUP(drive);
-	struct request *rq;
-
-        if (IN_BYTE(IDE_NSECTOR_REG) != 0) {
-            if (jiffies < hwgroup->poll_timeout) {
-                ide_set_handler (drive, &promise_write_pollfunc, 1);
-                return; /* continue polling... */
-            }
-            printk("%s: write timed-out!\n",drive->name);
-            ide_error (drive, "write timeout", GET_STAT());
-            return;
-        }
-        
-	ide_multwrite(drive, 4);
-        rq = hwgroup->rq;
-        for (i = rq->nr_sectors; i > 0;) {
-            i -= rq->current_nr_sectors;
-            ide_end_request(1, hwgroup);
-        }
-        return;
-}
-
-/*
- * 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. Don't ask me why, but this is
- * how it's done in the drivers for other O/Ses. There is no interrupt
- * generated on writes, which is why we have to do it like this.
- */
-static void promise_write (ide_drive_t *drive)
-{
-    ide_hwgroup_t *hwgroup = HWGROUP(drive);
-    struct request *rq = &hwgroup->wrq;
-    int i;
-
-    if (rq->nr_sectors > 4) {
-        ide_multwrite(drive, rq->nr_sectors - 4);
-        hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
-        ide_set_handler (drive, &promise_write_pollfunc, 1);
-        return;
-    } else {
-        ide_multwrite(drive, rq->nr_sectors);
-        rq = hwgroup->rq;
-        for (i = rq->nr_sectors; i > 0;) {
-            i -= rq->current_nr_sectors;
-            ide_end_request(1, hwgroup);
-        }
-    }
-}
-
-/*
- * do_promise_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.
- */
-void do_promise_io (ide_drive_t *drive, struct request *rq)
-{
-	unsigned long timeout;
-	byte stat;
-
-	if (rq->cmd == READ) {
-	    ide_set_handler(drive, &promise_read_intr, WAIT_CMD);
-	    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 simulate
-   an interrupt. Ugh! Otherwise, if an interrupt will occur, bit0
-   of the SELECT register will be high, so we can just return and
-   be interrupted.*/
-	    timeout = jiffies + HZ/20; /* 50ms wait */
-	    do {
-		stat=GET_STAT();
-		if(stat & DRQ_STAT) {
-/*                    unsigned long flags;
-                    save_flags(flags);
-                    cli();
-                    disable_irq(HWIF(drive)->irq);
-*/
-		    ide_intr(HWIF(drive)->irq,HWGROUP(drive),NULL);
-/*                    enable_irq(HWIF(drive)->irq);
-                    restore_flags(flags);
-*/
-		    return;
-		}
-		if(IN_BYTE(IDE_SELECT_REG) & 0x01)
-		    return;
-		udelay(1);
-	    } while (jiffies < timeout);
-	    printk("%s: reading: No DRQ and not waiting - Odd!\n",
-		   drive->name);
-	    return;
-	}
-	if (rq->cmd == WRITE) {
-	    OUT_BYTE(PROMISE_WRITE, IDE_COMMAND_REG);
-	    if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
-		printk("%s: no DRQ after issuing PROMISE_WRITE\n", drive->name);
-		return;
-	    }
-	    if (!drive->unmask)
-		cli();
-	    HWGROUP(drive)->wrq = *rq; /* scratchpad */
-	    promise_write(drive);
-	    return;
-	}
-	printk("%s: bad command: %d\n", drive->name, rq->cmd);
-	ide_end_request(0, HWGROUP(drive));
-}