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Subject[preview] VIA IDE driver v3.11 with vt82c686b UDMA100 support
Hi!

For all of you who had problems getting the VIA IDE driver to work
correctly on the 686b, here is a driver that should work with those
chips, even in UDMA 100 mode. I've not tested it, because I don't have
the 686b myself. So it may eat your filesystem as well.

Good luck!

--
Vojtech Pavlik
SuSE Labs
#ifndef _IDE_TIMING_H
#define _IDE_TIMING_H

/*
* $Id: ide-timing.h,v 1.4 2000/10/02 20:48:56 vojtech Exp $
*
* Copyright (c) 1999-2000 Vojtech Pavlik
*
* Sponsored by SuSE
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
* Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
*/
#include <linux/hdreg.h>

#ifndef XFER_PIO_5
#define XFER_PIO_5 0x0d
#endif

struct ide_timing {
short mode;
short setup; /* t1 */
short act8b; /* t2 for 8-bit io */
short rec8b; /* t2i for 8-bit io */
short cyc8b; /* t0 for 8-bit io */
short active; /* t2 or tD */
short recover; /* t2i or tK */
short cycle; /* t0 */
short udma; /* t2CYCTYP/2 */
};
/*
* PIO 0-5, MWDMA 0-2 and UDMA 0-5 timings (in nanoseconds).
* These were taken from ATA/ATAPI-6 standard, rev 0a, except
* for PIO 5, which is a nonstandard extension.
*/
static struct ide_timing ide_timing[] = {
{ XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
{ XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
{ XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
{ XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
{ XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
{ XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
{ XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
{ XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
{ XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
{ XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
{ XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
{ XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
{ XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 },
{ XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
{ XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
{ XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
{ XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
{ XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 },
{ -1 }
};
#define IDE_TIMING_SETUP 0x01
#define IDE_TIMING_ACT8B 0x02
#define IDE_TIMING_REC8B 0x04
#define IDE_TIMING_CYC8B 0x08
#define IDE_TIMING_8BIT 0x0e
#define IDE_TIMING_ACTIVE 0x10
#define IDE_TIMING_RECOVER 0x20
#define IDE_TIMING_CYCLE 0x40
#define IDE_TIMING_UDMA 0x80
#define IDE_TIMING_ALL 0xff

#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))
#define FIT(v,min,max) MAX(MIN(v,max),min)
#define ENOUGH(v,unit) (((v)-1)/(unit)+1)
#define EZ(v,unit) ((v)?ENOUGH(v,unit):0)

#define XFER_MODE 0xf0
#define XFER_UDMA_100 0x44
#define XFER_UDMA_66 0x42
#define XFER_UDMA 0x40
#define XFER_MWDMA 0x20
#define XFER_SWDMA 0x10
#define XFER_EPIO 0x01
#define XFER_PIO 0x00

static short ide_find_best_mode(ide_drive_t *drive, int map)
{
struct hd_driveid *id = drive->id;
short best = 0;
if (!id)
return XFER_PIO_SLOW;
if ((map & XFER_UDMA) && (id->field_valid & 4)) { /* Want UDMA and UDMA bitmap valid */
if ((map & XFER_UDMA_100) == XFER_UDMA_100)
if ((best = (id->dma_ultra & 0x0020) ? XFER_UDMA_5 : 0)) return best;
if ((map & XFER_UDMA_66) == XFER_UDMA_66)
if ((best = (id->dma_ultra & 0x0010) ? XFER_UDMA_4 :
(id->dma_ultra & 0x0008) ? XFER_UDMA_3 : 0)) return best;
if ((best = (id->dma_ultra & 0x0004) ? XFER_UDMA_2 :
(id->dma_ultra & 0x0002) ? XFER_UDMA_1 :
(id->dma_ultra & 0x0001) ? XFER_UDMA_0 : 0)) return best;
}
if ((map & XFER_MWDMA) && (id->field_valid & 2)) { /* Want MWDMA and drive has EIDE fields */
if ((best = (id->dma_mword & 0x0004) ? XFER_MW_DMA_2 :
(id->dma_mword & 0x0002) ? XFER_MW_DMA_1 :
(id->dma_mword & 0x0001) ? XFER_MW_DMA_0 : 0)) return best;
}
if (map & XFER_SWDMA) { /* Want SWDMA */
if (id->field_valid & 2) { /* EIDE SWDMA */
if ((best = (id->dma_1word & 0x0004) ? XFER_SW_DMA_2 :
(id->dma_1word & 0x0002) ? XFER_SW_DMA_1 :
(id->dma_1word & 0x0001) ? XFER_SW_DMA_0 : 0)) return best;
}
if (id->capability & 1) { /* Pre-EIDE style SWDMA */
if ((best = (id->tDMA == 2) ? XFER_SW_DMA_2 :
(id->tDMA == 1) ? XFER_SW_DMA_1 :
(id->tDMA == 0) ? XFER_SW_DMA_0 : 0)) return best;
}
}

if ((map & XFER_EPIO) && (id->field_valid & 2)) { /* EIDE PIO modes */
if ((best = (drive->id->eide_pio_modes & 4) ? XFER_PIO_5 :
(drive->id->eide_pio_modes & 2) ? XFER_PIO_4 :
(drive->id->eide_pio_modes & 1) ? XFER_PIO_3 : 0)) return best;
}
return (drive->id->tPIO == 2) ? XFER_PIO_2 :
(drive->id->tPIO == 1) ? XFER_PIO_1 :
(drive->id->tPIO == 0) ? XFER_PIO_0 : XFER_PIO_SLOW;
}
static void ide_timing_quantize(struct ide_timing *t, struct ide_timing *q, int T, int UT)
{
q->setup = EZ(t->setup, T);
q->act8b = EZ(t->act8b, T);
q->rec8b = EZ(t->rec8b, T);
q->cyc8b = EZ(t->cyc8b, T);
q->active = EZ(t->active, T);
q->recover = EZ(t->recover, T);
q->cycle = EZ(t->cycle, T);
q->udma = EZ(t->udma, UT);
}
static void ide_timing_merge(struct ide_timing *a, struct ide_timing *b, struct ide_timing *m, unsigned int what)
{
if (what & IDE_TIMING_SETUP ) m->setup = MAX(a->setup, b->setup);
if (what & IDE_TIMING_ACT8B ) m->act8b = MAX(a->act8b, b->act8b);
if (what & IDE_TIMING_REC8B ) m->rec8b = MAX(a->rec8b, b->rec8b);
if (what & IDE_TIMING_CYC8B ) m->cyc8b = MAX(a->cyc8b, b->cyc8b);
if (what & IDE_TIMING_ACTIVE ) m->active = MAX(a->active, b->active);
if (what & IDE_TIMING_RECOVER) m->recover = MAX(a->recover, b->recover);
if (what & IDE_TIMING_CYCLE ) m->cycle = MAX(a->cycle, b->cycle);
if (what & IDE_TIMING_UDMA ) m->udma = MAX(a->udma, b->udma);
}
static struct ide_timing* ide_timing_find_mode(short speed)
{
struct ide_timing *t;
for (t = ide_timing; t->mode != speed; t++)
if (t->mode < 0)
return NULL;
return t;
}
static int ide_timing_compute(ide_drive_t *drive, short speed, struct ide_timing *t, int T, int UT)
{
struct hd_driveid *id = drive->id;
struct ide_timing *s, p;
/*
* Find the mode.
*/
if (!(s = ide_timing_find_mode(speed)))
return -EINVAL;
/*
* If the drive is an EIDE drive, it can tell us it needs extended
* PIO/MWDMA cycle timing.
*/
if (id && id->field_valid & 2) { /* EIDE drive */
memset(&p, 0, sizeof(p));

switch (speed & XFER_MODE) {
case XFER_PIO:
if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = id->eide_pio;
else p.cycle = p.cyc8b = id->eide_pio_iordy;
break;
case XFER_MWDMA:
p.cycle = id->eide_dma_min;
break;
}
ide_timing_merge(&p, t, t, IDE_TIMING_CYCLE | IDE_TIMING_CYC8B);
}
/*
* Convert the timing to bus clock counts.
*/
ide_timing_quantize(s, t, T, UT);

/*
* Even in DMA/UDMA modes we still use PIO access for IDENTIFY, S.M.A.R.T
* and some other commands. We have to ensure that the DMA cycle timing is
* slower/equal than the fastest PIO timing.
*/
if ((speed & XFER_MODE) != XFER_PIO) {
ide_timing_compute(drive, ide_find_best_mode(drive, XFER_PIO | XFER_EPIO), &p, T, UT);
ide_timing_merge(&p, t, t, IDE_TIMING_ALL);
}
/*
* Lenghten active & recovery time so that cycle time is correct.
*/
if (t->act8b + t->rec8b < t->cyc8b) {
t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
t->rec8b = t->cyc8b - t->act8b;
}
if (t->active + t->recover < t->cycle) {
t->active += (t->cycle - (t->active + t->recover)) / 2;
t->recover = t->cycle - t->active;
}
return 0;
}
#endif
/*
* $Id: via82cxxx.c,v 3.11 2001/01/10 12:33:60 vojtech Exp $
*
* Copyright (c) 2000 Vojtech Pavlik
*
* Based on the work of:
* Michel Aubry
* Jeff Garzik
* Andre Hedrick
*
* Sponsored by SuSE
*/
/*
* VIA IDE driver for Linux. Supports
*
* vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
* vt82c686, vt82c686a, vt82c686b, vt8231, vt8233
*
* southbridges, which can be found in
*
* VIA Apollo VP, VPX, VPX/97, VP2, VP2/97, VP3, MVP3, MVP4, P6, Pro,
* Pro Plus, Pro 133, Pro 133A, ProMedia PM601, ProSavage PM133, PLE133,
* Pro 266, KX133, KT133, ProSavage KM133, KT133A, KT266
* PC-Chips VXPro, VXPro+, TXPro-III, TXPro-AGP, ViaGra, BXToo, BXTel
* AMD 640, 640 AGP, 750 IronGate
* ETEQ 6618, 6628, 6638
* Micron Samurai
*
* chipsets. Supports
*
* PIO 0-5, MWDMA 0-2, SWDMA 0-2 and UDMA 0-5
*
* (this includes UDMA33, 66 and 100) modes. UDMA66 and higher modes are
* autodetected only in case the BIOS has detected a 80 wire cable. To ignore
* the BIOS data, use 'ide0=ata66' or 'ide1=ata66' on the kernel command line.
* You may also need to configure the kernel IDE driver to ignore byte93 UDMA66
* enable bits if your drives don't use them correctly to achieve UDMA66/100
* operation.
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
* Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <asm/io.h>

#include "ide-timing.h"

#define VIA_IDE_ENABLE 0x40
#define VIA_IDE_CONFIG 0x41
#define VIA_FIFO_CONFIG 0x43
#define VIA_MISC_1 0x44
#define VIA_MISC_2 0x45
#define VIA_MISC_3 0x46
#define VIA_DRIVE_TIMING 0x48
#define VIA_8BIT_TIMING 0x4e
#define VIA_ADDRESS_SETUP 0x4c
#define VIA_UDMA_TIMING 0x50

#define VIA_UDMA 0x07
#define VIA_UDMA_NONE 0x00
#define VIA_UDMA_33 0x01
#define VIA_UDMA_66 0x02
#define VIA_UDMA_100 0x03
#define VIA_FIFO_SIZE 0x08
#define VIA_THR0_3041 0x10
#define VIA_THR0_RMI 0x20
#define VIA_CMDTIME 0x40

/*
* VIA SouthBridge chips.
*/
static struct via_isa_bridge {
char *name;
unsigned short id;
unsigned char rev;
unsigned char flags;
} via_isa_bridges[] = {
{ "vt8233", PCI_DEVICE_ID_VIA_8233_0, 0x00, VIA_UDMA_100 },
{ "vt8231", PCI_DEVICE_ID_VIA_8231, 0x00, VIA_UDMA_66 },
{ "vt82c686b", PCI_DEVICE_ID_VIA_82C686, 0x40, VIA_UDMA_100 | VIA_FIFO_SIZE },
{ "vt82c686a (cf/cg)", PCI_DEVICE_ID_VIA_82C686, 0x20, VIA_UDMA_66 | VIA_CMDTIME | VIA_THR0_RMI },
{ "vt82c686a (cd/ce)", PCI_DEVICE_ID_VIA_82C686, 0x10, VIA_UDMA_66 | VIA_CMDTIME | VIA_THR0_RMI },
{ "vt82c686", PCI_DEVICE_ID_VIA_82C686, 0x00, VIA_UDMA_66 | VIA_CMDTIME | VIA_THR0_RMI },
{ "vt82c596b (cf/cg)", PCI_DEVICE_ID_VIA_82C596, 0x20, VIA_UDMA_66 | VIA_CMDTIME | VIA_THR0_RMI },
{ "vt82c596b (cd/ce)", PCI_DEVICE_ID_VIA_82C596, 0x10, VIA_UDMA_66 | VIA_CMDTIME | VIA_THR0_RMI },
{ "vt82c596a", PCI_DEVICE_ID_VIA_82C596, 0x00, VIA_UDMA_33 | VIA_CMDTIME | VIA_THR0_RMI },
{ "vt82c586b (3041)", PCI_DEVICE_ID_VIA_82C586_0, 0x40, VIA_UDMA_33 | VIA_CMDTIME | VIA_FIFO_SIZE | VIA_THR0_3041},
{ "vt82c586b (3040)", PCI_DEVICE_ID_VIA_82C586_0, 0x30, VIA_UDMA_33 | VIA_CMDTIME | VIA_FIFO_SIZE },
{ "vt82c586a", PCI_DEVICE_ID_VIA_82C586_0, 0x20, VIA_UDMA_33 | VIA_CMDTIME | VIA_FIFO_SIZE },
{ "vt82c586", PCI_DEVICE_ID_VIA_82C586_0, 0x00, VIA_UDMA_NONE | VIA_CMDTIME },
{ NULL }
};
static struct via_isa_bridge *via_config;
static unsigned char via_enabled;
static unsigned int via_80w;

/*
* VIA /proc entry.
*/
#ifdef CONFIG_PROC_FS

#include <linux/stat.h>
#include <linux/proc_fs.h>

int via_proc, via_base;
static struct pci_dev *bmide_dev, *isa_dev;
extern int (*via_display_info)(char *, char **, off_t, int); /* ide-proc.c */
static char *via_control3[] = { "No limit", "64", "128", "192" };
#define via_print(format, arg...) p += sprintf(p, format "\n" , ## arg)
#define via_print_drive(name, format, arg...)\
p += sprintf(p, name); for (i = 0; i < 4; i++) p += sprintf(p, format, ## arg); p += sprintf(p, "\n");

static int via_get_info(char *buffer, char **addr, off_t offset, int count)
{
short pci_clock, speed[4], cycle[4], setup[4], active[4],
recover[4], uen[4], udma[4], active8b[4], recover8b[4];
struct pci_dev *dev = bmide_dev;
unsigned int v, u, i;
unsigned short c, w;
unsigned char t, x;
char *p = buffer;
via_print("----------VIA BusMastering IDE Configuration----------------");
via_print("Driver Version: 3.11");
via_print("South Bridge: VIA %s", via_config->name);

pci_read_config_byte(isa_dev, PCI_REVISION_ID, &t);
pci_read_config_byte(dev, PCI_REVISION_ID, &x);
via_print("Revision: ISA %#x IDE %#x", t, x);

via_print("BM-DMA base: %#x", via_base);
via_print("PCI clock: %dMHz", pci_clock = system_bus_clock());

pci_read_config_byte(dev, VIA_MISC_1, &t);
via_print("Master Read Cycle IRDY: %dws", (t & 64) >> 6);
via_print("Master Write Cycle IRDY: %dws", (t & 32) >> 5);
via_print("BM IDE Status Register Read Retry: %s", (t & 8) ? "yes" : "no");

pci_read_config_byte(dev, VIA_MISC_3, &t);
via_print("Max DRDY Pulse Width: %s%s", via_control3[(t & 0x03)], (t & 0x03) ? " PCI clocks" : "");

via_print("-----------------------Primary IDE-------Secondary IDE------");
via_print("Read DMA FIFO flush: %10s%20s", (t & 0x80) ? "yes" : "no", (t & 0x40) ? "yes" : "no");
via_print("End Sector FIFO flush: %10s%20s", (t & 0x20) ? "yes" : "no", (t & 0x10) ? "yes" : "no");
pci_read_config_byte(dev, VIA_IDE_CONFIG, &t);
via_print("Prefetch Buffer: %10s%20s", (t & 0x80) ? "yes" : "no", (t & 0x20) ? "yes" : "no");
via_print("Post Write Buffer: %10s%20s", (t & 0x40) ? "yes" : "no", (t & 0x10) ? "yes" : "no");

pci_read_config_byte(dev, VIA_IDE_ENABLE, &t);
via_print("Enabled: %10s%20s", (t & 0x02) ? "yes" : "no", (t & 0x01) ? "yes" : "no");

c = inb(via_base + 0x02) | (inb(via_base + 0x0a) << 8);
via_print("Simplex only: %10s%20s", (c & 0x80) ? "yes" : "no", (c & 0x8000) ? "yes" : "no");
via_print("Cable Type: %10s%20s", (via_80w & 1) ? "80w" : "40w", (via_80w & 2) ? "80w" : "40w");

via_print("-------------------drive0----drive1----drive2----drive3-----");
pci_read_config_byte(dev, VIA_ADDRESS_SETUP, &t);
pci_read_config_dword(dev, VIA_DRIVE_TIMING, &v);
pci_read_config_word(dev, VIA_8BIT_TIMING, &w);

if (via_config->flags & VIA_UDMA)
pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
else u = 0;
for (i = 0; i < 4; i++) {
setup[i] = ((t >> ((3 - i) << 1)) & 0x3) + 1;
recover8b[i] = ((w >> ((1 - (i >> 1)) << 3)) & 0xf) + 1;
active8b[i] = ((w >> (((1 - (i >> 1)) << 3) + 4)) & 0xf) + 1;
active[i] = ((v >> (((3 - i) << 3) + 4)) & 0xf) + 1;
recover[i] = ((v >> ((3 - i) << 3)) & 0xf) + 1;
udma[i] = (((u >> ((3 - i) << 3)) & 0x7) + 2) *
(((via_config->flags & VIA_UDMA) == VIA_UDMA_100) ? 2 : (((u >> (((3 - i) & 2) << 3)) & 0x8) ? 3 : 6));
uen[i] = ((u >> ((3 - i) << 3)) & 0x20) ? 1 : 0;

speed[i] = 120 * pci_clock / (uen[i] ? udma[i] : (active[i] + recover[i]) * 6);
cycle[i] = 1000 / pci_clock * (uen[i] ? udma[i] : (active[i] + recover[i]) * 6) / 6;
}
via_print_drive("Transfer Mode: ", "%10s",
(c & ((i & 1) ? 0x40 : 0x20) << ((i & 2) << 2)) ? (uen[i] ? "UDMA" : "DMA") : "PIO");

via_print_drive("Address Setup: ", "%8dns", (1000 / pci_clock) * setup[i]);
via_print_drive("Cmd Active: ", "%8dns", (1000 / pci_clock) * active8b[i]);
via_print_drive("Cmd Recovery: ", "%8dns", (1000 / pci_clock) * recover8b[i]);
via_print_drive("Data Active: ", "%8dns", (1000 / pci_clock) * active[i]);
via_print_drive("Data Recovery: ", "%8dns", (1000 / pci_clock) * recover[i]);
via_print_drive("Cycle Time: ", "%8dns", cycle[i]);
via_print_drive("Transfer Rate: ", "%4d.%dMB/s", speed[i] / 10, speed[i] % 10);

return p - buffer; /* hoping it is less than 4K... */
}
#endif

/*
* via_set_speed() writes timing values to the chipset registers
*/
static void via_set_speed(struct pci_dev *dev, unsigned char dn, struct ide_timing *timing)
{
unsigned char t;
pci_read_config_byte(dev, VIA_ADDRESS_SETUP, &t);
t = (t & ~(3 << ((3 - dn) << 1))) | ((FIT(timing->setup, 1, 4) - 1) << ((3 - dn) << 1));
pci_write_config_byte(dev, VIA_ADDRESS_SETUP, t);
if (via_config->flags & VIA_CMDTIME)
pci_write_config_byte(dev, VIA_8BIT_TIMING + (1 - (dn >> 1)),
((FIT(timing->act8b, 1, 16) - 1) << 4) | (FIT(timing->rec8b, 1, 16) - 1));
pci_write_config_byte(dev, VIA_DRIVE_TIMING + (3 - dn),
((FIT(timing->active, 1, 16) - 1) << 4) | (FIT(timing->recover, 1, 16) - 1));
switch(via_config->flags & VIA_UDMA) {
case VIA_UDMA_33: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 5) - 2)) : 0x03; break;
case VIA_UDMA_66: t = timing->udma ? (0xe8 | (FIT(timing->udma, 2, 9) - 2)) : 0x0f; break;
case VIA_UDMA_100: t = timing->udma ? (0xf0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
default: return;
}
pci_write_config_byte(dev, VIA_UDMA_TIMING + (3 - dn), t);
}
/*
* via_set_drive() computes timing values configures the drive and
* the chipset to a desired transfer mode. It also can be called
* by upper layers.
*/
static int via_set_drive(ide_drive_t *drive, unsigned char speed)
{
ide_drive_t *peer = HWIF(drive)->drives + (~drive->dn & 1);
struct ide_timing t, p;
int err, T, UT;
if (speed != XFER_PIO_SLOW && speed != drive->current_speed)
if ((err = ide_config_drive_speed(drive, speed)))
return err;
T = 1000 / system_bus_clock();
UT = T / MAX(via_config->flags & VIA_UDMA, 1);

ide_timing_compute(drive, speed, &t, T, UT);

if (peer->present) {
ide_timing_compute(peer, peer->current_speed, &p, T, UT);
ide_timing_merge(&p, &t, &t, IDE_TIMING_8BIT);
}
via_set_speed(HWIF(drive)->pci_dev, drive->dn, &t);

if (!drive->init_speed)
drive->init_speed = speed;
drive->current_speed = speed;
return 0;
}
/*
* via82cxxx_tune_drive() is a callback from upper layers for
* PIO-only tuning.
*/
static void via82cxxx_tune_drive(ide_drive_t *drive, unsigned char pio)
{
if (!((via_enabled >> HWIF(drive)->channel) & 1))
return;
if (pio == 255) {
via_set_drive(drive, ide_find_best_mode(drive, XFER_PIO | XFER_EPIO));
return;
}
via_set_drive(drive, XFER_PIO_0 + MIN(pio, 5));
}
#ifdef CONFIG_BLK_DEV_IDEDMA

/*
* via82cxxx_dmaproc() is a callback from upper layers that can do
* a lot, but we use it for DMA/PIO tuning only, delegating everything
* else to the default ide_dmaproc().
*/
int via82cxxx_dmaproc(ide_dma_action_t func, ide_drive_t *drive)
{
if (func == ide_dma_check) {
short w80 = eighty_ninty_three(drive);

short speed = ide_find_best_mode(drive,
XFER_PIO | XFER_EPIO | XFER_SWDMA | XFER_MWDMA |
(via_config->flags & VIA_UDMA ? XFER_UDMA : 0) |
(w80 && (via_config->flags & VIA_UDMA) == VIA_UDMA_66 ? XFER_UDMA_66 : 0) |
(w80 && (via_config->flags & VIA_UDMA) == VIA_UDMA_100 ? XFER_UDMA_100 : 0));
func = ((speed & XFER_MODE) != XFER_PIO) ? ide_dma_on : ide_dma_off_quietly;

if (via_set_drive(drive, speed))
func = ide_dma_off;
}
return ide_dmaproc(func, drive);
}
#endif /* CONFIG_BLK_DEV_IDEDMA */
/*
* The initialization callback. Here we determine the IDE chip type
* and initialize its drive independent registers.
*/
unsigned int __init pci_init_via82cxxx(struct pci_dev *dev, const char *name)
{
struct pci_dev *isa = NULL;
unsigned char t, v;
unsigned int u;
int i;
/*
* Find ISA bridge to see how good the IDE is.
*/
for (via_config = via_isa_bridges; via_config->id; via_config++)
if ((isa = pci_find_device(PCI_VENDOR_ID_VIA, via_config->id, NULL))) {
pci_read_config_byte(isa, PCI_REVISION_ID, &t);
if (t >= via_config->rev)
break;
}
if (!via_config->id) {
printk(KERN_WARNING "VP_IDE: Unknown VIA SouthBridge, contact Vojtech Pavlik <vojtech@suse.cz>\n");
return -ENODEV;
}
/*
* Check 80-wire cable presence.
*/
switch (via_config->flags & VIA_UDMA) {
case VIA_UDMA_100:

pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
for (i = 24; i >= 0; i -= 8)
if ((u >> i) & 0x10) /* BIOS 80-wire bit enabled */
via_80w |= (1 << (1 - (i >> 4)));
break;
case VIA_UDMA_66:

pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
pci_write_config_dword(dev, VIA_UDMA_TIMING, u | 0x80008);
for (i = 24; i >= 0; i -= 8)
if (((u >> (i & 16)) & 8) && (((u >> i) & 7) < 2)) /* 2x PCI clock && less than 3T/cycle */
via_80w |= (1 << (1 - (i >> 4)));
break;
}
pci_read_config_byte(dev, VIA_IDE_ENABLE, &v);
via_enabled = ((v & 1) ? 2 : 0) | ((v & 2) ? 1 : 0);
/*
* Set up FIFO sizes and thresholds.
*/
pci_read_config_byte(dev, VIA_FIFO_CONFIG, &t);

if (via_config->flags & VIA_FIFO_SIZE) {
t = (t & 0x90) | 0x0a; /* 50% FIFO threshold */
switch (via_enabled) {
case 1: t |= 0x00; break; /* all on primary */
case 2: t |= 0x60; break; /* all on secondary */
case 3: t |= 0x20; break; /* fifo evenly distributed */
}
} else t = (t & 0xf0) | 0x0a;
pci_write_config_byte(dev, VIA_FIFO_CONFIG, t);

/*
* Set up the rest of FIFO stuff.
*/
pci_read_config_byte(dev, VIA_IDE_CONFIG, &t);
pci_write_config_byte(dev, VIA_IDE_CONFIG, t | 0xf0); /* prefetch & postwrite */
if (via_config->flags & VIA_THR0_3041) {
pci_read_config_byte(dev, VIA_MISC_1, &t); /* 0% FIFO threshold */
pci_write_config_byte(dev, VIA_MISC_1, t | 0x03);
}
if (via_config->flags & VIA_THR0_RMI) {
pci_read_config_byte(dev, VIA_MISC_2, &t); /* 0% FIFO threshold, fast memory */
pci_write_config_byte(dev, VIA_MISC_2, (t & 0xf0) | 0x03);
}
pci_read_config_byte(dev, VIA_MISC_3, &t);
pci_write_config_byte(dev, VIA_MISC_3, t | 0xf0); /* enable FIFO flushing */
/*
* Print the boot message.
*/
printk(KERN_INFO "VP_IDE: VIA %s IDE %s controller on pci%d:%d.%d\n",
via_config->name,
(via_config->flags & VIA_UDMA) == VIA_UDMA_100 ? "UDMA100" :
(via_config->flags & VIA_UDMA) == VIA_UDMA_66 ? "UDMA66" :
(via_config->flags & VIA_UDMA) == VIA_UDMA_33 ? "UDMA33" : "MWDMA16",
dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
/*
* Register /proc/ide/via entry
*/
#ifdef CONFIG_PROC_FS
if (!via_proc) {
for (i = 0; i < 6; i++)
if (pci_resource_flags(dev, i) & IORESOURCE_IO)
break;
via_base = pci_resource_start(dev, i);
bmide_dev = dev;
isa_dev = isa;
via_display_info = &via_get_info;
via_proc = 1;

}
#endif
return 0;
}
unsigned int __init ata66_via82cxxx(ide_hwif_t *hwif)
{
return ((via_enabled & via_80w) >> hwif->channel) & 1;
}
void __init ide_init_via82cxxx(ide_hwif_t *hwif)
{
int i;
hwif->tuneproc = &via82cxxx_tune_drive;
hwif->speedproc = &via_set_drive;
hwif->autodma = 0;

for (i = 0; i < 2; i++) {
hwif->drives[i].io_32bit = 1;
hwif->drives[i].unmask = 1;
hwif->drives[i].autotune = 1;
hwif->drives[i].dn = hwif->channel * 2 + i;
}
#ifdef CONFIG_BLK_DEV_IDEDMA
if (hwif->dma_base) {
hwif->dmaproc = &via82cxxx_dmaproc;
hwif->autodma = 1;
}
#endif /* CONFIG_BLK_DEV_IDEDMA */
}
/*
* We allow the BM-DMA driver only work on enabled interfaces.
*/
void __init ide_dmacapable_via82cxxx(ide_hwif_t *hwif, unsigned long dmabase)
{
if ((via_enabled >> hwif->channel) & 1)
ide_setup_dma(hwif, dmabase, 8);
}
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  Last update: 2005-03-22 13:28    [from the cache]
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