[PATCH] sched.c: correct comment for this_rq_lock()

[linux-2.6/linux-2.6-openrd.git] / drivers / ide / pci / via82cxxx.c

/*
 *
 * 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[] = {
        { "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 = ide_get_hwifdata(hwif);
        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 = ide_get_hwifdata(drive->hwif);
        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 = ide_get_hwifdata(hwif);
        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 hwif->ide_dma_on(drive);
        return hwif->ide_dma_off_quietly(drive);
}

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;
}

/**
 *      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 via_isa_bridge *via_config;
        u8 t, v;
        unsigned int u;

        /*
         * Find the ISA bridge to see how good the IDE is.
         */
        via_config = via_config_find(&isa);

        /* We checked this earlier so if it fails here deeep badness
           is involved */

        BUG_ON(!via_config->id);

        /*
         * Setup or disable Clk66 if appropriate
         */

        if ((via_config->flags & VIA_UDMA) == VIA_UDMA_66) {
                /* Enable Clk66 */
                pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
                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_read_config_dword(dev, VIA_UDMA_TIMING, &u);
                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;
}

/*
 * Check and handle 80-wire cable presence
 */
static void __devinit via_cable_detect(struct pci_dev *dev, struct via82cxxx_dev *vdev)
{
        unsigned int u;
        int i;
        pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);

        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;

        }
}

static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
{
        struct via82cxxx_dev *vdev = kmalloc(sizeof(struct via82cxxx_dev),
                GFP_KERNEL);
        struct pci_dev *isa = NULL;
        int i;

        if (vdev == NULL) {
                printk(KERN_ERR "VP_IDE: out of memory :(\n");
                return;
        }

        memset(vdev, 0, sizeof(struct via82cxxx_dev));
        ide_set_hwifdata(hwif, vdev);

        vdev->via_config = via_config_find(&isa);
        via_cable_detect(hwif->pci_dev, vdev);

        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},
        { 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 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");