[deliverable/linux.git] / drivers / ide / pci / sc1200.c

/*
 * linux/drivers/ide/pci/sc1200.c               Version 0.95    Jun 16 2007
 *
 * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>
 * Copyright (C)      2007              Bartlomiej Zolnierkiewicz
 *
 * May be copied or modified under the terms of the GNU General Public License
 *
 * Development of this chipset driver was funded
 * by the nice folks at National Semiconductor.
 *
 * Documentation:
 *      Available from National Semiconductor
 */

#include <linux/module.h>
#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/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <linux/pm.h>
#include <asm/io.h>
#include <asm/irq.h>

#define SC1200_REV_A    0x00
#define SC1200_REV_B1   0x01
#define SC1200_REV_B3   0x02
#define SC1200_REV_C1   0x03
#define SC1200_REV_D1   0x04

#define PCI_CLK_33      0x00
#define PCI_CLK_48      0x01
#define PCI_CLK_66      0x02
#define PCI_CLK_33A     0x03

static unsigned short sc1200_get_pci_clock (void)
{
        unsigned char chip_id, silicon_revision;
        unsigned int pci_clock;
        /*
         * Check the silicon revision, as not all versions of the chip
         * have the register with the fast PCI bus timings.
         */
        chip_id = inb (0x903c);
        silicon_revision = inb (0x903d);

        // Read the fast pci clock frequency
        if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
                pci_clock = PCI_CLK_33;
        } else {
                // check clock generator configuration (cfcc)
                // the clock is in bits 8 and 9 of this word

                pci_clock = inw (0x901e);
                pci_clock >>= 8;
                pci_clock &= 0x03;
                if (pci_clock == PCI_CLK_33A)
                        pci_clock = PCI_CLK_33;
        }
        return pci_clock;
}

extern char *ide_xfer_verbose (byte xfer_rate);

/*
 * Set a new transfer mode at the drive
 */
static int sc1200_set_xfer_mode (ide_drive_t *drive, byte mode)
{
        printk("%s: sc1200_set_xfer_mode(%s)\n", drive->name, ide_xfer_verbose(mode));
        return ide_config_drive_speed(drive, mode);
}

/*
 * Here are the standard PIO mode 0-4 timings for each "format".
 * Format-0 uses fast data reg timings, with slower command reg timings.
 * Format-1 uses fast timings for all registers, but won't work with all drives.
 */
static const unsigned int sc1200_pio_timings[4][5] =
        {{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},  // format0  33Mhz
         {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010},  // format1, 33Mhz
         {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021},  // format1, 48Mhz
         {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}}; // format1, 66Mhz

/*
 * After chip reset, the PIO timings are set to 0x00009172, which is not valid.
 */
//#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)

static void sc1200_tunepio(ide_drive_t *drive, u8 pio)
{
        ide_hwif_t *hwif = drive->hwif;
        struct pci_dev *pdev = hwif->pci_dev;
        unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;

        pci_read_config_dword(pdev, basereg + 4, &format);
        format = (format >> 31) & 1;
        if (format)
                format += sc1200_get_pci_clock();
        pci_write_config_dword(pdev, basereg + ((drive->dn & 1) << 3),
                               sc1200_pio_timings[format][pio]);
}

/*
 *      The SC1200 specifies that two drives sharing a cable cannot mix
 *      UDMA/MDMA.  It has to be one or the other, for the pair, though
 *      different timings can still be chosen for each drive.  We could
 *      set the appropriate timing bits on the fly, but that might be
 *      a bit confusing.  So, for now we statically handle this requirement
 *      by looking at our mate drive to see what it is capable of, before
 *      choosing a mode for our own drive.
 */
static u8 sc1200_udma_filter(ide_drive_t *drive)
{
        ide_hwif_t *hwif = drive->hwif;
        ide_drive_t *mate = &hwif->drives[(drive->dn & 1) ^ 1];
        struct hd_driveid *mateid = mate->id;
        u8 mask = hwif->ultra_mask;

        if (mate->present == 0)
                goto out;

        if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
                if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
                        goto out;
                if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
                        mask = 0;
        }
out:
        return mask;
}

static int sc1200_tune_chipset(ide_drive_t *drive, const u8 mode)
{
        ide_hwif_t              *hwif = HWIF(drive);
        int                     unit = drive->select.b.unit;
        unsigned int            reg, timings;
        unsigned short          pci_clock;
        unsigned int            basereg = hwif->channel ? 0x50 : 0x40;

        /*
         * Tell the drive to switch to the new mode; abort on failure.
         */
        if (sc1200_set_xfer_mode(drive, mode)) {
                printk("SC1200: set xfer mode failure\n");
                return 1;       /* failure */
        }

        switch (mode) {
        case XFER_PIO_4:
        case XFER_PIO_3:
        case XFER_PIO_2:
        case XFER_PIO_1:
        case XFER_PIO_0:
                sc1200_tunepio(drive, mode - XFER_PIO_0);
                return 0;
        }

        pci_clock = sc1200_get_pci_clock();

        /*
         * Now tune the chipset to match the drive:
         *
         * Note that each DMA mode has several timings associated with it.
         * The correct timing depends on the fast PCI clock freq.
         */
        timings = 0;
        switch (mode) {
                case XFER_UDMA_0:
                        switch (pci_clock) {
                                case PCI_CLK_33:        timings = 0x00921250;   break;
                                case PCI_CLK_48:        timings = 0x00932470;   break;
                                case PCI_CLK_66:        timings = 0x009436a1;   break;
                        }
                        break;
                case XFER_UDMA_1:
                        switch (pci_clock) {
                                case PCI_CLK_33:        timings = 0x00911140;   break;
                                case PCI_CLK_48:        timings = 0x00922260;   break;
                                case PCI_CLK_66:        timings = 0x00933481;   break;
                        }
                        break;
                case XFER_UDMA_2:
                        switch (pci_clock) {
                                case PCI_CLK_33:        timings = 0x00911030;   break;
                                case PCI_CLK_48:        timings = 0x00922140;   break;
                                case PCI_CLK_66:        timings = 0x00923261;   break;
                        }
                        break;
                case XFER_MW_DMA_0:
                        switch (pci_clock) {
                                case PCI_CLK_33:        timings = 0x00077771;   break;
                                case PCI_CLK_48:        timings = 0x000bbbb2;   break;
                                case PCI_CLK_66:        timings = 0x000ffff3;   break;
                        }
                        break;
                case XFER_MW_DMA_1:
                        switch (pci_clock) {
                                case PCI_CLK_33:        timings = 0x00012121;   break;
                                case PCI_CLK_48:        timings = 0x00024241;   break;
                                case PCI_CLK_66:        timings = 0x00035352;   break;
                        }
                        break;
                case XFER_MW_DMA_2:
                        switch (pci_clock) {
                                case PCI_CLK_33:        timings = 0x00002020;   break;
                                case PCI_CLK_48:        timings = 0x00013131;   break;
                                case PCI_CLK_66:        timings = 0x00015151;   break;
                        }
                        break;
                default:
                        BUG();
                        break;
        }

        if (unit == 0) {                        /* are we configuring drive0? */
                pci_read_config_dword(hwif->pci_dev, basereg+4, &reg);
                timings |= reg & 0x80000000;    /* preserve PIO format bit */
                pci_write_config_dword(hwif->pci_dev, basereg+4, timings);
        } else {
                pci_write_config_dword(hwif->pci_dev, basereg+12, timings);
        }

        return 0;       /* success */
}

/*
 * sc1200_config_dma() handles selection/setting of DMA/UDMA modes
 * for both the chipset and drive.
 */
static int sc1200_config_dma (ide_drive_t *drive)
{
        if (ide_tune_dma(drive))
                return 0;

        return 1;
}


/*  Replacement for the standard ide_dma_end action in
 *  dma_proc.
 *
 *  returns 1 on error, 0 otherwise
 */
static int sc1200_ide_dma_end (ide_drive_t *drive)
{
        ide_hwif_t *hwif = HWIF(drive);
        unsigned long dma_base = hwif->dma_base;
        byte dma_stat;

        dma_stat = inb(dma_base+2);             /* get DMA status */

        if (!(dma_stat & 4))
                printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
                  dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));

        outb(dma_stat|0x1b, dma_base+2);        /* clear the INTR & ERROR bits */
        outb(inb(dma_base)&~1, dma_base);       /* !! DO THIS HERE !! stop DMA */

        drive->waiting_for_dma = 0;
        ide_destroy_dmatable(drive);            /* purge DMA mappings */

        return (dma_stat & 7) != 4;             /* verify good DMA status */
}

/*
 * sc1200_set_pio_mode() handles setting of PIO modes
 * for both the chipset and drive.
 *
 * All existing BIOSs for this chipset guarantee that all drives
 * will have valid default PIO timings set up before we get here.
 */

static void sc1200_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
        ide_hwif_t      *hwif = HWIF(drive);
        int             mode = -1;

        /*
         * bad abuse of ->set_pio_mode interface
         */
        switch (pio) {
                case 200: mode = XFER_UDMA_0;   break;
                case 201: mode = XFER_UDMA_1;   break;
                case 202: mode = XFER_UDMA_2;   break;
                case 100: mode = XFER_MW_DMA_0; break;
                case 101: mode = XFER_MW_DMA_1; break;
                case 102: mode = XFER_MW_DMA_2; break;
        }
        if (mode != -1) {
                printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
                hwif->dma_off_quietly(drive);
                if (sc1200_tune_chipset(drive, mode) == 0)
                        hwif->dma_host_on(drive);
                return;
        }

        if (sc1200_set_xfer_mode(drive, XFER_PIO_0 + pio) == 0)
                sc1200_tunepio(drive, pio);
}

#ifdef CONFIG_PM
static ide_hwif_t *lookup_pci_dev (ide_hwif_t *prev, struct pci_dev *dev)
{
        int     h;

        for (h = 0; h < MAX_HWIFS; h++) {
                ide_hwif_t *hwif = &ide_hwifs[h];
                if (prev) {
                        if (hwif == prev)
                                prev = NULL;    // found previous, now look for next match
                } else {
                        if (hwif && hwif->pci_dev == dev)
                                return hwif;    // found next match
                }
        }
        return NULL;    // not found
}

typedef struct sc1200_saved_state_s {
        __u32           regs[4];
} sc1200_saved_state_t;


static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
{
        ide_hwif_t              *hwif = NULL;

        printk("SC1200: suspend(%u)\n", state.event);

        if (state.event == PM_EVENT_ON) {
                // we only save state when going from full power to less

                //
                // Loop over all interfaces that are part of this PCI device:
                //
                while ((hwif = lookup_pci_dev(hwif, dev)) != NULL) {
                        sc1200_saved_state_t    *ss;
                        unsigned int            basereg, r;
                        //
                        // allocate a permanent save area, if not already allocated
                        //
                        ss = (sc1200_saved_state_t *)hwif->config_data;
                        if (ss == NULL) {
                                ss = kmalloc(sizeof(sc1200_saved_state_t), GFP_KERNEL);
                                if (ss == NULL)
                                        return -ENOMEM;
                                hwif->config_data = (unsigned long)ss;
                        }
                        ss = (sc1200_saved_state_t *)hwif->config_data;
                        //
                        // Save timing registers:  this may be unnecessary if 
                        // BIOS also does it
                        //
                        basereg = hwif->channel ? 0x50 : 0x40;
                        for (r = 0; r < 4; ++r) {
                                pci_read_config_dword (hwif->pci_dev, basereg + (r<<2), &ss->regs[r]);
                        }
                }
        }

        /* You don't need to iterate over disks -- sysfs should have done that for you already */ 

        pci_disable_device(dev);
        pci_set_power_state(dev, pci_choose_state(dev, state));
        dev->current_state = state.event;
        return 0;
}

static int sc1200_resume (struct pci_dev *dev)
{
        ide_hwif_t      *hwif = NULL;

        pci_set_power_state(dev, PCI_D0);       // bring chip back from sleep state
        dev->current_state = PM_EVENT_ON;
        pci_enable_device(dev);
        //
        // loop over all interfaces that are part of this pci device:
        //
        while ((hwif = lookup_pci_dev(hwif, dev)) != NULL) {
                unsigned int            basereg, r;
                sc1200_saved_state_t    *ss = (sc1200_saved_state_t *)hwif->config_data;

                //
                // Restore timing registers:  this may be unnecessary if BIOS also does it
                //
                basereg = hwif->channel ? 0x50 : 0x40;
                if (ss != NULL) {
                        for (r = 0; r < 4; ++r) {
                                pci_write_config_dword(hwif->pci_dev, basereg + (r<<2), ss->regs[r]);
                        }
                }
        }
        return 0;
}
#endif

/*
 * This gets invoked by the IDE driver once for each channel,
 * and performs channel-specific pre-initialization before drive probing.
 */
static void __devinit init_hwif_sc1200 (ide_hwif_t *hwif)
{
        if (hwif->mate)
                hwif->serialized = hwif->mate->serialized = 1;
        hwif->autodma = 0;
        if (hwif->dma_base) {
                hwif->udma_filter = sc1200_udma_filter;
                hwif->ide_dma_check = &sc1200_config_dma;
                hwif->ide_dma_end   = &sc1200_ide_dma_end;
                if (!noautodma)
                        hwif->autodma = 1;

                hwif->set_pio_mode = &sc1200_set_pio_mode;
                hwif->speedproc = &sc1200_tune_chipset;
        }
        hwif->atapi_dma = 1;
        hwif->ultra_mask = 0x07;
        hwif->mwdma_mask = 0x07;

        hwif->drives[0].autodma = hwif->autodma;
        hwif->drives[1].autodma = hwif->autodma;
}

static ide_pci_device_t sc1200_chipset __devinitdata = {
        .name           = "SC1200",
        .init_hwif      = init_hwif_sc1200,
        .autodma        = AUTODMA,
        .bootable       = ON_BOARD,
        .host_flags     = IDE_HFLAG_ABUSE_DMA_MODES,
        .pio_mask       = ATA_PIO4,
};

static int __devinit sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
        return ide_setup_pci_device(dev, &sc1200_chipset);
}

static struct pci_device_id sc1200_pci_tbl[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
        { 0, },
};
MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);

static struct pci_driver driver = {
        .name           = "SC1200_IDE",
        .id_table       = sc1200_pci_tbl,
        .probe          = sc1200_init_one,
#ifdef CONFIG_PM
        .suspend        = sc1200_suspend,
        .resume         = sc1200_resume,
#endif
};

static int __init sc1200_ide_init(void)
{
        return ide_pci_register_driver(&driver);
}

module_init(sc1200_ide_init);

MODULE_AUTHOR("Mark Lord");
MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
MODULE_LICENSE("GPL");