linux/drivers/ide/sc1200.c
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   1/*
   2 * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>
   3 * Copyright (C)      2007              Bartlomiej Zolnierkiewicz
   4 *
   5 * May be copied or modified under the terms of the GNU General Public License
   6 *
   7 * Development of this chipset driver was funded
   8 * by the nice folks at National Semiconductor.
   9 *
  10 * Documentation:
  11 *      Available from National Semiconductor
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/types.h>
  16#include <linux/kernel.h>
  17#include <linux/slab.h>
  18#include <linux/pci.h>
  19#include <linux/init.h>
  20#include <linux/ide.h>
  21#include <linux/pm.h>
  22
  23#include <asm/io.h>
  24
  25#define DRV_NAME "sc1200"
  26
  27#define SC1200_REV_A    0x00
  28#define SC1200_REV_B1   0x01
  29#define SC1200_REV_B3   0x02
  30#define SC1200_REV_C1   0x03
  31#define SC1200_REV_D1   0x04
  32
  33#define PCI_CLK_33      0x00
  34#define PCI_CLK_48      0x01
  35#define PCI_CLK_66      0x02
  36#define PCI_CLK_33A     0x03
  37
  38static unsigned short sc1200_get_pci_clock (void)
  39{
  40        unsigned char chip_id, silicon_revision;
  41        unsigned int pci_clock;
  42        /*
  43         * Check the silicon revision, as not all versions of the chip
  44         * have the register with the fast PCI bus timings.
  45         */
  46        chip_id = inb (0x903c);
  47        silicon_revision = inb (0x903d);
  48
  49        // Read the fast pci clock frequency
  50        if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
  51                pci_clock = PCI_CLK_33;
  52        } else {
  53                // check clock generator configuration (cfcc)
  54                // the clock is in bits 8 and 9 of this word
  55
  56                pci_clock = inw (0x901e);
  57                pci_clock >>= 8;
  58                pci_clock &= 0x03;
  59                if (pci_clock == PCI_CLK_33A)
  60                        pci_clock = PCI_CLK_33;
  61        }
  62        return pci_clock;
  63}
  64
  65/*
  66 * Here are the standard PIO mode 0-4 timings for each "format".
  67 * Format-0 uses fast data reg timings, with slower command reg timings.
  68 * Format-1 uses fast timings for all registers, but won't work with all drives.
  69 */
  70static const unsigned int sc1200_pio_timings[4][5] =
  71        {{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},  // format0  33Mhz
  72         {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010},  // format1, 33Mhz
  73         {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021},  // format1, 48Mhz
  74         {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}}; // format1, 66Mhz
  75
  76/*
  77 * After chip reset, the PIO timings are set to 0x00009172, which is not valid.
  78 */
  79//#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
  80
  81static void sc1200_tunepio(ide_drive_t *drive, u8 pio)
  82{
  83        ide_hwif_t *hwif = drive->hwif;
  84        struct pci_dev *pdev = to_pci_dev(hwif->dev);
  85        unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;
  86
  87        pci_read_config_dword(pdev, basereg + 4, &format);
  88        format = (format >> 31) & 1;
  89        if (format)
  90                format += sc1200_get_pci_clock();
  91        pci_write_config_dword(pdev, basereg + ((drive->dn & 1) << 3),
  92                               sc1200_pio_timings[format][pio]);
  93}
  94
  95/*
  96 *      The SC1200 specifies that two drives sharing a cable cannot mix
  97 *      UDMA/MDMA.  It has to be one or the other, for the pair, though
  98 *      different timings can still be chosen for each drive.  We could
  99 *      set the appropriate timing bits on the fly, but that might be
 100 *      a bit confusing.  So, for now we statically handle this requirement
 101 *      by looking at our mate drive to see what it is capable of, before
 102 *      choosing a mode for our own drive.
 103 */
 104static u8 sc1200_udma_filter(ide_drive_t *drive)
 105{
 106        ide_hwif_t *hwif = drive->hwif;
 107        ide_drive_t *mate = ide_get_pair_dev(drive);
 108        u16 *mateid;
 109        u8 mask = hwif->ultra_mask;
 110
 111        if (mate == NULL)
 112                goto out;
 113        mateid = mate->id;
 114
 115        if (ata_id_has_dma(mateid) && __ide_dma_bad_drive(mate) == 0) {
 116                if ((mateid[ATA_ID_FIELD_VALID] & 4) &&
 117                    (mateid[ATA_ID_UDMA_MODES] & 7))
 118                        goto out;
 119                if (mateid[ATA_ID_MWDMA_MODES] & 7)
 120                        mask = 0;
 121        }
 122out:
 123        return mask;
 124}
 125
 126static void sc1200_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 127{
 128        struct pci_dev          *dev = to_pci_dev(hwif->dev);
 129        unsigned int            reg, timings;
 130        unsigned short          pci_clock;
 131        unsigned int            basereg = hwif->channel ? 0x50 : 0x40;
 132        const u8                mode = drive->dma_mode;
 133
 134        static const u32 udma_timing[3][3] = {
 135                { 0x00921250, 0x00911140, 0x00911030 },
 136                { 0x00932470, 0x00922260, 0x00922140 },
 137                { 0x009436a1, 0x00933481, 0x00923261 },
 138        };
 139
 140        static const u32 mwdma_timing[3][3] = {
 141                { 0x00077771, 0x00012121, 0x00002020 },
 142                { 0x000bbbb2, 0x00024241, 0x00013131 },
 143                { 0x000ffff3, 0x00035352, 0x00015151 },
 144        };
 145
 146        pci_clock = sc1200_get_pci_clock();
 147
 148        /*
 149         * Note that each DMA mode has several timings associated with it.
 150         * The correct timing depends on the fast PCI clock freq.
 151         */
 152
 153        if (mode >= XFER_UDMA_0)
 154                timings =  udma_timing[pci_clock][mode - XFER_UDMA_0];
 155        else
 156                timings = mwdma_timing[pci_clock][mode - XFER_MW_DMA_0];
 157
 158        if ((drive->dn & 1) == 0) {
 159                pci_read_config_dword(dev, basereg + 4, &reg);
 160                timings |= reg & 0x80000000;    /* preserve PIO format bit */
 161                pci_write_config_dword(dev, basereg + 4, timings);
 162        } else
 163                pci_write_config_dword(dev, basereg + 12, timings);
 164}
 165
 166/*  Replacement for the standard ide_dma_end action in
 167 *  dma_proc.
 168 *
 169 *  returns 1 on error, 0 otherwise
 170 */
 171static int sc1200_dma_end(ide_drive_t *drive)
 172{
 173        ide_hwif_t *hwif = drive->hwif;
 174        unsigned long dma_base = hwif->dma_base;
 175        u8 dma_stat;
 176
 177        dma_stat = inb(dma_base+2);             /* get DMA status */
 178
 179        if (!(dma_stat & 4))
 180                printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
 181                  dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));
 182
 183        outb(dma_stat|0x1b, dma_base+2);        /* clear the INTR & ERROR bits */
 184        outb(inb(dma_base)&~1, dma_base);       /* !! DO THIS HERE !! stop DMA */
 185
 186        return (dma_stat & 7) != 4;             /* verify good DMA status */
 187}
 188
 189/*
 190 * sc1200_set_pio_mode() handles setting of PIO modes
 191 * for both the chipset and drive.
 192 *
 193 * All existing BIOSs for this chipset guarantee that all drives
 194 * will have valid default PIO timings set up before we get here.
 195 */
 196
 197static void sc1200_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 198{
 199        int             mode = -1;
 200        const u8        pio = drive->pio_mode - XFER_PIO_0;
 201
 202        /*
 203         * bad abuse of ->set_pio_mode interface
 204         */
 205        switch (pio) {
 206                case 200: mode = XFER_UDMA_0;   break;
 207                case 201: mode = XFER_UDMA_1;   break;
 208                case 202: mode = XFER_UDMA_2;   break;
 209                case 100: mode = XFER_MW_DMA_0; break;
 210                case 101: mode = XFER_MW_DMA_1; break;
 211                case 102: mode = XFER_MW_DMA_2; break;
 212        }
 213        if (mode != -1) {
 214                printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
 215                ide_dma_off_quietly(drive);
 216                if (ide_set_dma_mode(drive, mode) == 0 &&
 217                    (drive->dev_flags & IDE_DFLAG_USING_DMA))
 218                        hwif->dma_ops->dma_host_set(drive, 1);
 219                return;
 220        }
 221
 222        sc1200_tunepio(drive, pio);
 223}
 224
 225#ifdef CONFIG_PM
 226struct sc1200_saved_state {
 227        u32 regs[8];
 228};
 229
 230static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
 231{
 232        printk("SC1200: suspend(%u)\n", state.event);
 233
 234        /*
 235         * we only save state when going from full power to less
 236         */
 237        if (state.event == PM_EVENT_ON) {
 238                struct ide_host *host = pci_get_drvdata(dev);
 239                struct sc1200_saved_state *ss = host->host_priv;
 240                unsigned int r;
 241
 242                /*
 243                 * save timing registers
 244                 * (this may be unnecessary if BIOS also does it)
 245                 */
 246                for (r = 0; r < 8; r++)
 247                        pci_read_config_dword(dev, 0x40 + r * 4, &ss->regs[r]);
 248        }
 249
 250        pci_disable_device(dev);
 251        pci_set_power_state(dev, pci_choose_state(dev, state));
 252        return 0;
 253}
 254
 255static int sc1200_resume (struct pci_dev *dev)
 256{
 257        struct ide_host *host = pci_get_drvdata(dev);
 258        struct sc1200_saved_state *ss = host->host_priv;
 259        unsigned int r;
 260        int i;
 261
 262        i = pci_enable_device(dev);
 263        if (i)
 264                return i;
 265
 266        /*
 267         * restore timing registers
 268         * (this may be unnecessary if BIOS also does it)
 269         */
 270        for (r = 0; r < 8; r++)
 271                pci_write_config_dword(dev, 0x40 + r * 4, ss->regs[r]);
 272
 273        return 0;
 274}
 275#endif
 276
 277static const struct ide_port_ops sc1200_port_ops = {
 278        .set_pio_mode           = sc1200_set_pio_mode,
 279        .set_dma_mode           = sc1200_set_dma_mode,
 280        .udma_filter            = sc1200_udma_filter,
 281};
 282
 283static const struct ide_dma_ops sc1200_dma_ops = {
 284        .dma_host_set           = ide_dma_host_set,
 285        .dma_setup              = ide_dma_setup,
 286        .dma_start              = ide_dma_start,
 287        .dma_end                = sc1200_dma_end,
 288        .dma_test_irq           = ide_dma_test_irq,
 289        .dma_lost_irq           = ide_dma_lost_irq,
 290        .dma_timer_expiry       = ide_dma_sff_timer_expiry,
 291        .dma_sff_read_status    = ide_dma_sff_read_status,
 292};
 293
 294static const struct ide_port_info sc1200_chipset __devinitconst = {
 295        .name           = DRV_NAME,
 296        .port_ops       = &sc1200_port_ops,
 297        .dma_ops        = &sc1200_dma_ops,
 298        .host_flags     = IDE_HFLAG_SERIALIZE |
 299                          IDE_HFLAG_POST_SET_MODE |
 300                          IDE_HFLAG_ABUSE_DMA_MODES,
 301        .pio_mask       = ATA_PIO4,
 302        .mwdma_mask     = ATA_MWDMA2,
 303        .udma_mask      = ATA_UDMA2,
 304};
 305
 306static int __devinit sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 307{
 308        struct sc1200_saved_state *ss = NULL;
 309        int rc;
 310
 311#ifdef CONFIG_PM
 312        ss = kmalloc(sizeof(*ss), GFP_KERNEL);
 313        if (ss == NULL)
 314                return -ENOMEM;
 315#endif
 316        rc = ide_pci_init_one(dev, &sc1200_chipset, ss);
 317        if (rc)
 318                kfree(ss);
 319
 320        return rc;
 321}
 322
 323static const struct pci_device_id sc1200_pci_tbl[] = {
 324        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
 325        { 0, },
 326};
 327MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
 328
 329static struct pci_driver sc1200_pci_driver = {
 330        .name           = "SC1200_IDE",
 331        .id_table       = sc1200_pci_tbl,
 332        .probe          = sc1200_init_one,
 333        .remove         = ide_pci_remove,
 334#ifdef CONFIG_PM
 335        .suspend        = sc1200_suspend,
 336        .resume         = sc1200_resume,
 337#endif
 338};
 339
 340static int __init sc1200_ide_init(void)
 341{
 342        return ide_pci_register_driver(&sc1200_pci_driver);
 343}
 344
 345static void __exit sc1200_ide_exit(void)
 346{
 347        pci_unregister_driver(&sc1200_pci_driver);
 348}
 349
 350module_init(sc1200_ide_init);
 351module_exit(sc1200_ide_exit);
 352
 353MODULE_AUTHOR("Mark Lord");
 354MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
 355MODULE_LICENSE("GPL");
 356
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