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linux/drivers/ide/pci/via82cxxx.c
Bartlomiej Zolnierkiewicz 3608b5d71a ide: add ide_set_dma() helper (v2) 
* add ide_set_dma() helper and make ide_hwif_t.ide_dma_check return
  -1 when DMA needs to be disabled (== need to call ->ide_dma_off_quietly)
   0 when DMA needs to be enabled  (== need to call ->ide_dma_on)
   1 when DMA setting shouldn't be changed
* fix IDE code to use ide_set_dma() instead if using ->ide_dma_check directly

v2:
* updated for scc_pata

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2007-02-17 02:40:26 +01:00

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/*
*
* Version 3.38
*
* VIA IDE driver for Linux. Supported southbridges:
*
* vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
* vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
* vt8235, vt8237, vt8237a
*
* Copyright (c) 2000-2002 Vojtech Pavlik
*
* Based on the work of:
* Michel Aubry
* Jeff Garzik
* Andre Hedrick
*
* Documentation:
* Obsolete device documentation publically available from via.com.tw
* Current device documentation available under NDA only
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/module.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>
#ifdef CONFIG_PPC_CHRP
#include <asm/processor.h>
#endif
#include "ide-timing.h"
#define DISPLAY_VIA_TIMINGS
#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 0x007
#define VIA_UDMA_NONE 0x000
#define VIA_UDMA_33 0x001
#define VIA_UDMA_66 0x002
#define VIA_UDMA_100 0x003
#define VIA_UDMA_133 0x004
#define VIA_BAD_PREQ 0x010 /* Crashes if PREQ# till DDACK# set */
#define VIA_BAD_CLK66 0x020 /* 66 MHz clock doesn't work correctly */
#define VIA_SET_FIFO 0x040 /* Needs to have FIFO split set */
#define VIA_NO_UNMASK 0x080 /* Doesn't work with IRQ unmasking on */
#define VIA_BAD_ID 0x100 /* Has wrong vendor ID (0x1107) */
#define VIA_BAD_AST 0x200 /* Don't touch Address Setup Timing */
/*
* VIA SouthBridge chips.
*/
static struct via_isa_bridge {
char *name;
u16 id;
u8 rev_min;
u8 rev_max;
u16 flags;
} via_isa_bridges[] = {
{ "cx700", PCI_DEVICE_ID_VIA_CX700, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "vt8237s", PCI_DEVICE_ID_VIA_8237S, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "vt6410", PCI_DEVICE_ID_VIA_6410, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "vt8251", PCI_DEVICE_ID_VIA_8251, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "vt8237", PCI_DEVICE_ID_VIA_8237, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "vt8237a", PCI_DEVICE_ID_VIA_8237A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "vt8235", PCI_DEVICE_ID_VIA_8235, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "vt8233a", PCI_DEVICE_ID_VIA_8233A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
{ "vt8233c", PCI_DEVICE_ID_VIA_8233C_0, 0x00, 0x2f, VIA_UDMA_100 },
{ "vt8233", PCI_DEVICE_ID_VIA_8233_0, 0x00, 0x2f, VIA_UDMA_100 },
{ "vt8231", PCI_DEVICE_ID_VIA_8231, 0x00, 0x2f, VIA_UDMA_100 },
{ "vt82c686b", PCI_DEVICE_ID_VIA_82C686, 0x40, 0x4f, VIA_UDMA_100 },
{ "vt82c686a", PCI_DEVICE_ID_VIA_82C686, 0x10, 0x2f, VIA_UDMA_66 },
{ "vt82c686", PCI_DEVICE_ID_VIA_82C686, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
{ "vt82c596b", PCI_DEVICE_ID_VIA_82C596, 0x10, 0x2f, VIA_UDMA_66 },
{ "vt82c596a", PCI_DEVICE_ID_VIA_82C596, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
{ "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
{ "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
{ "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
{ "vt82c586a", PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
{ "vt82c586", PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
{ "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
{ "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
{ NULL }
};
static unsigned int via_clock;
static char *via_dma[] = { "MWDMA16", "UDMA33", "UDMA66", "UDMA100", "UDMA133" };
struct via82cxxx_dev
{
struct via_isa_bridge *via_config;
unsigned int via_80w;
};
/**
* via_set_speed - write timing registers
* @dev: PCI device
* @dn: device
* @timing: IDE timing data to use
*
* via_set_speed writes timing values to the chipset registers
*/
static void via_set_speed(ide_hwif_t *hwif, u8 dn, struct ide_timing *timing)
{
struct pci_dev *dev = hwif->pci_dev;
struct via82cxxx_dev *vdev = pci_get_drvdata(hwif->pci_dev);
u8 t;
if (~vdev->via_config->flags & VIA_BAD_AST) {
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);
}
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 (vdev->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 ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
case VIA_UDMA_133: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
default: return;
}
pci_write_config_byte(dev, VIA_UDMA_TIMING + (3 - dn), t);
}
/**
* via_set_drive - configure transfer mode
* @drive: Drive to set up
* @speed: desired speed
*
* 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, u8 speed)
{
ide_drive_t *peer = HWIF(drive)->drives + (~drive->dn & 1);
struct via82cxxx_dev *vdev = pci_get_drvdata(drive->hwif->pci_dev);
struct ide_timing t, p;
unsigned int T, UT;
if (speed != XFER_PIO_SLOW)
ide_config_drive_speed(drive, speed);
T = 1000000000 / via_clock;
switch (vdev->via_config->flags & VIA_UDMA) {
case VIA_UDMA_33: UT = T; break;
case VIA_UDMA_66: UT = T/2; break;
case VIA_UDMA_100: UT = T/3; break;
case VIA_UDMA_133: UT = T/4; break;
default: UT = T;
}
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), drive->dn, &t);
if (!drive->init_speed)
drive->init_speed = speed;
drive->current_speed = speed;
return 0;
}
/**
* via82cxxx_tune_drive - PIO setup
* @drive: drive to set up
* @pio: mode to use (255 for 'best possible')
*
* A callback from the upper layers for PIO-only tuning.
*/
static void via82cxxx_tune_drive(ide_drive_t *drive, u8 pio)
{
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_t(u8, pio, 5));
}
/**
* via82cxxx_ide_dma_check - set up for DMA if possible
* @drive: IDE drive to set up
*
* Set up the drive for the highest supported speed considering the
* driver, controller and cable
*/
static int via82cxxx_ide_dma_check (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
struct via82cxxx_dev *vdev = pci_get_drvdata(hwif->pci_dev);
u16 w80 = hwif->udma_four;
u16 speed = ide_find_best_mode(drive,
XFER_PIO | XFER_EPIO | XFER_SWDMA | XFER_MWDMA |
(vdev->via_config->flags & VIA_UDMA ? XFER_UDMA : 0) |
(w80 && (vdev->via_config->flags & VIA_UDMA) >= VIA_UDMA_66 ? XFER_UDMA_66 : 0) |
(w80 && (vdev->via_config->flags & VIA_UDMA) >= VIA_UDMA_100 ? XFER_UDMA_100 : 0) |
(w80 && (vdev->via_config->flags & VIA_UDMA) >= VIA_UDMA_133 ? XFER_UDMA_133 : 0));
via_set_drive(drive, speed);
if (drive->autodma && (speed & XFER_MODE) != XFER_PIO)
return 0;
return -1;
}
static struct via_isa_bridge *via_config_find(struct pci_dev **isa)
{
struct via_isa_bridge *via_config;
u8 t;
for (via_config = via_isa_bridges; via_config->id; via_config++)
if ((*isa = pci_get_device(PCI_VENDOR_ID_VIA +
!!(via_config->flags & VIA_BAD_ID),
via_config->id, NULL))) {
pci_read_config_byte(*isa, PCI_REVISION_ID, &t);
if (t >= via_config->rev_min &&
t <= via_config->rev_max)
break;
pci_dev_put(*isa);
}
return via_config;
}
/*
* Check and handle 80-wire cable presence
*/
static void __devinit via_cable_detect(struct via82cxxx_dev *vdev, u32 u)
{
int i;
switch (vdev->via_config->flags & VIA_UDMA) {
case VIA_UDMA_66:
for (i = 24; i >= 0; i -= 8)
if (((u >> (i & 16)) & 8) &&
((u >> i) & 0x20) &&
(((u >> i) & 7) < 2)) {
/*
* 2x PCI clock and
* UDMA w/ < 3T/cycle
*/
vdev->via_80w |= (1 << (1 - (i >> 4)));
}
break;
case VIA_UDMA_100:
for (i = 24; i >= 0; i -= 8)
if (((u >> i) & 0x10) ||
(((u >> i) & 0x20) &&
(((u >> i) & 7) < 4))) {
/* BIOS 80-wire bit or
* UDMA w/ < 60ns/cycle
*/
vdev->via_80w |= (1 << (1 - (i >> 4)));
}
break;
case VIA_UDMA_133:
for (i = 24; i >= 0; i -= 8)
if (((u >> i) & 0x10) ||
(((u >> i) & 0x20) &&
(((u >> i) & 7) < 6))) {
/* BIOS 80-wire bit or
* UDMA w/ < 60ns/cycle
*/
vdev->via_80w |= (1 << (1 - (i >> 4)));
}
break;
}
}
/**
* init_chipset_via82cxxx - initialization handler
* @dev: PCI device
* @name: Name of interface
*
* The initialization callback. Here we determine the IDE chip type
* and initialize its drive independent registers.
*/
static unsigned int __devinit init_chipset_via82cxxx(struct pci_dev *dev, const char *name)
{
struct pci_dev *isa = NULL;
struct via82cxxx_dev *vdev;
struct via_isa_bridge *via_config;
u8 t, v;
u32 u;
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
if (!vdev) {
printk(KERN_ERR "VP_IDE: out of memory :(\n");
return -ENOMEM;
}
pci_set_drvdata(dev, vdev);
/*
* Find the ISA bridge to see how good the IDE is.
*/
vdev->via_config = via_config = via_config_find(&isa);
/* We checked this earlier so if it fails here deeep badness
is involved */
BUG_ON(!via_config->id);
/*
* Detect cable and configure Clk66
*/
pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
via_cable_detect(vdev, u);
if ((via_config->flags & VIA_UDMA) == VIA_UDMA_66) {
/* Enable Clk66 */
pci_write_config_dword(dev, VIA_UDMA_TIMING, u|0x80008);
} else if (via_config->flags & VIA_BAD_CLK66) {
/* Would cause trouble on 596a and 686 */
pci_write_config_dword(dev, VIA_UDMA_TIMING, u & ~0x80008);
}
/*
* Check whether interfaces are enabled.
*/
pci_read_config_byte(dev, VIA_IDE_ENABLE, &v);
/*
* Set up FIFO sizes and thresholds.
*/
pci_read_config_byte(dev, VIA_FIFO_CONFIG, &t);
/* Disable PREQ# till DDACK# */
if (via_config->flags & VIA_BAD_PREQ) {
/* Would crash on 586b rev 41 */
t &= 0x7f;
}
/* Fix FIFO split between channels */
if (via_config->flags & VIA_SET_FIFO) {
t &= (t & 0x9f);
switch (v & 3) {
case 2: t |= 0x00; break; /* 16 on primary */
case 1: t |= 0x60; break; /* 16 on secondary */
case 3: t |= 0x20; break; /* 8 pri 8 sec */
}
}
pci_write_config_byte(dev, VIA_FIFO_CONFIG, t);
/*
* Determine system bus clock.
*/
via_clock = system_bus_clock() * 1000;
switch (via_clock) {
case 33000: via_clock = 33333; break;
case 37000: via_clock = 37500; break;
case 41000: via_clock = 41666; break;
}
if (via_clock < 20000 || via_clock > 50000) {
printk(KERN_WARNING "VP_IDE: User given PCI clock speed "
"impossible (%d), using 33 MHz instead.\n", via_clock);
printk(KERN_WARNING "VP_IDE: Use ide0=ata66 if you want "
"to assume 80-wire cable.\n");
via_clock = 33333;
}
/*
* Print the boot message.
*/
pci_read_config_byte(isa, PCI_REVISION_ID, &t);
printk(KERN_INFO "VP_IDE: VIA %s (rev %02x) IDE %s "
"controller on pci%s\n",
via_config->name, t,
via_dma[via_config->flags & VIA_UDMA],
pci_name(dev));
pci_dev_put(isa);
return 0;
}
static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
{
struct via82cxxx_dev *vdev = pci_get_drvdata(hwif->pci_dev);
int i;
hwif->autodma = 0;
hwif->tuneproc = &via82cxxx_tune_drive;
hwif->speedproc = &via_set_drive;
#ifdef CONFIG_PPC_CHRP
if(machine_is(chrp) && _chrp_type == _CHRP_Pegasos) {
hwif->irq = hwif->channel ? 15 : 14;
}
#endif
for (i = 0; i < 2; i++) {
hwif->drives[i].io_32bit = 1;
hwif->drives[i].unmask = (vdev->via_config->flags & VIA_NO_UNMASK) ? 0 : 1;
hwif->drives[i].autotune = 1;
hwif->drives[i].dn = hwif->channel * 2 + i;
}
if (!hwif->dma_base)
return;
hwif->atapi_dma = 1;
hwif->ultra_mask = 0x7f;
hwif->mwdma_mask = 0x07;
hwif->swdma_mask = 0x07;
if (!hwif->udma_four)
hwif->udma_four = (vdev->via_80w >> hwif->channel) & 1;
hwif->ide_dma_check = &via82cxxx_ide_dma_check;
if (!noautodma)
hwif->autodma = 1;
hwif->drives[0].autodma = hwif->autodma;
hwif->drives[1].autodma = hwif->autodma;
}
static ide_pci_device_t via82cxxx_chipsets[] __devinitdata = {
{ /* 0 */
.name = "VP_IDE",
.init_chipset = init_chipset_via82cxxx,
.init_hwif = init_hwif_via82cxxx,
.channels = 2,
.autodma = NOAUTODMA,
.enablebits = {{0x40,0x02,0x02}, {0x40,0x01,0x01}},
.bootable = ON_BOARD
},{ /* 1 */
.name = "VP_IDE",
.init_chipset = init_chipset_via82cxxx,
.init_hwif = init_hwif_via82cxxx,
.channels = 2,
.autodma = AUTODMA,
.enablebits = {{0x00,0x00,0x00}, {0x00,0x00,0x00}},
.bootable = ON_BOARD,
}
};
static int __devinit via_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
struct pci_dev *isa = NULL;
struct via_isa_bridge *via_config;
/*
* Find the ISA bridge and check we know what it is.
*/
via_config = via_config_find(&isa);
pci_dev_put(isa);
if (!via_config->id) {
printk(KERN_WARNING "VP_IDE: Unknown VIA SouthBridge, disabling DMA.\n");
return -ENODEV;
}
return ide_setup_pci_device(dev, &via82cxxx_chipsets[id->driver_data]);
}
static struct pci_device_id via_pci_tbl[] = {
{ PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C576_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{ PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{ PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_6410, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
{ PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_SATA_EIDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
{ 0, },
};
MODULE_DEVICE_TABLE(pci, via_pci_tbl);
static struct pci_driver driver = {
.name = "VIA_IDE",
.id_table = via_pci_tbl,
.probe = via_init_one,
};
static int __init via_ide_init(void)
{
return ide_pci_register_driver(&driver);
}
module_init(via_ide_init);
MODULE_AUTHOR("Vojtech Pavlik, Michel Aubry, Jeff Garzik, Andre Hedrick");
MODULE_DESCRIPTION("PCI driver module for VIA IDE");
MODULE_LICENSE("GPL");
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