drivers/ide/pci/sc1200.c

   1 /*
   2  * linux/drivers/ide/pci/sc1200.c               Version 0.97    Aug 3 2007
   3  *
   4  * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>
   5  * Copyright (C)      2007              Bartlomiej Zolnierkiewicz
   6  *
   7  * May be copied or modified under the terms of the GNU General Public License
   8  *
   9  * Development of this chipset driver was funded
  10  * by the nice folks at National Semiconductor.
  11  *
  12  * Documentation:
  13  *      Available from National Semiconductor
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/delay.h>
  20 #include <linux/timer.h>
  21 #include <linux/mm.h>
  22 #include <linux/ioport.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/hdreg.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/pci.h>
  27 #include <linux/init.h>
  28 #include <linux/ide.h>
  29 #include <linux/pm.h>
  30 #include <asm/io.h>
  31 #include <asm/irq.h>
  32
  33 #define SC1200_REV_A    0x00
  34 #define SC1200_REV_B1   0x01
  35 #define SC1200_REV_B3   0x02
  36 #define SC1200_REV_C1   0x03
  37 #define SC1200_REV_D1   0x04
  38
  39 #define PCI_CLK_33      0x00
  40 #define PCI_CLK_48      0x01
  41 #define PCI_CLK_66      0x02
  42 #define PCI_CLK_33A     0x03
  43
  44 static unsigned short sc1200_get_pci_clock (void)
  45 {
  46         unsigned char chip_id, silicon_revision;
  47         unsigned int pci_clock;
  48         /*
  49          * Check the silicon revision, as not all versions of the chip
  50          * have the register with the fast PCI bus timings.
  51          */
  52         chip_id = inb (0x903c);
  53         silicon_revision = inb (0x903d);
  54
  55         // Read the fast pci clock frequency
  56         if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
  57                 pci_clock = PCI_CLK_33;
  58         } else {
  59                 // check clock generator configuration (cfcc)
  60                 // the clock is in bits 8 and 9 of this word
  61
  62                 pci_clock = inw (0x901e);
  63                 pci_clock >>= 8;
  64                 pci_clock &= 0x03;
  65                 if (pci_clock == PCI_CLK_33A)
  66                         pci_clock = PCI_CLK_33;
  67         }
  68         return pci_clock;
  69 }
  70
  71 /*
  72  * Here are the standard PIO mode 0-4 timings for each "format".
  73  * Format-0 uses fast data reg timings, with slower command reg timings.
  74  * Format-1 uses fast timings for all registers, but won't work with all drives.
  75  */
  76 static const unsigned int sc1200_pio_timings[4][5] =
  77         {{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},  // format0  33Mhz
  78          {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010},  // format1, 33Mhz
  79          {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021},  // format1, 48Mhz
  80          {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}}; // format1, 66Mhz
  81
  82 /*
  83  * After chip reset, the PIO timings are set to 0x00009172, which is not valid.
  84  */
  85 //#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
  86
  87 static void sc1200_tunepio(ide_drive_t *drive, u8 pio)
  88 {
  89         ide_hwif_t *hwif = drive->hwif;
  90         struct pci_dev *pdev = hwif->pci_dev;
  91         unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;
  92
  93         pci_read_config_dword(pdev, basereg + 4, &format);
  94         format = (format >> 31) & 1;
  95         if (format)
  96                 format += sc1200_get_pci_clock();
  97         pci_write_config_dword(pdev, basereg + ((drive->dn & 1) << 3),
  98                                sc1200_pio_timings[format][pio]);
  99 }
 100
 101 /*
 102  *      The SC1200 specifies that two drives sharing a cable cannot mix
 103  *      UDMA/MDMA.  It has to be one or the other, for the pair, though
 104  *      different timings can still be chosen for each drive.  We could
 105  *      set the appropriate timing bits on the fly, but that might be
 106  *      a bit confusing.  So, for now we statically handle this requirement
 107  *      by looking at our mate drive to see what it is capable of, before
 108  *      choosing a mode for our own drive.
 109  */
 110 static u8 sc1200_udma_filter(ide_drive_t *drive)
 111 {
 112         ide_hwif_t *hwif = drive->hwif;
 113         ide_drive_t *mate = &hwif->drives[(drive->dn & 1) ^ 1];
 114         struct hd_driveid *mateid = mate->id;
 115         u8 mask = hwif->ultra_mask;
 116
 117         if (mate->present == 0)
 118                 goto out;
 119
 120         if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
 121                 if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
 122                         goto out;
 123                 if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
 124                         mask = 0;
 125         }
 126 out:
 127         return mask;
 128 }
 129
 130 static void sc1200_set_dma_mode(ide_drive_t *drive, const u8 mode)
 131 {
 132         ide_hwif_t              *hwif = HWIF(drive);
 133         int                     unit = drive->select.b.unit;
 134         unsigned int            reg, timings;
 135         unsigned short          pci_clock;
 136         unsigned int            basereg = hwif->channel ? 0x50 : 0x40;
 137
 138         pci_clock = sc1200_get_pci_clock();
 139
 140         /*
 141          * Note that each DMA mode has several timings associated with it.
 142          * The correct timing depends on the fast PCI clock freq.
 143          */
 144         timings = 0;
 145         switch (mode) {
 146                 case XFER_UDMA_0:
 147                         switch (pci_clock) {
 148                                 case PCI_CLK_33:        timings = 0x00921250;   break;
 149                                 case PCI_CLK_48:        timings = 0x00932470;   break;
 150                                 case PCI_CLK_66:        timings = 0x009436a1;   break;
 151                         }
 152                         break;
 153                 case XFER_UDMA_1:
 154                         switch (pci_clock) {
 155                                 case PCI_CLK_33:        timings = 0x00911140;   break;
 156                                 case PCI_CLK_48:        timings = 0x00922260;   break;
 157                                 case PCI_CLK_66:        timings = 0x00933481;   break;
 158                         }
 159                         break;
 160                 case XFER_UDMA_2:
 161                         switch (pci_clock) {
 162                                 case PCI_CLK_33:        timings = 0x00911030;   break;
 163                                 case PCI_CLK_48:        timings = 0x00922140;   break;
 164                                 case PCI_CLK_66:        timings = 0x00923261;   break;
 165                         }
 166                         break;
 167                 case XFER_MW_DMA_0:
 168                         switch (pci_clock) {
 169                                 case PCI_CLK_33:        timings = 0x00077771;   break;
 170                                 case PCI_CLK_48:        timings = 0x000bbbb2;   break;
 171                                 case PCI_CLK_66:        timings = 0x000ffff3;   break;
 172                         }
 173                         break;
 174                 case XFER_MW_DMA_1:
 175                         switch (pci_clock) {
 176                                 case PCI_CLK_33:        timings = 0x00012121;   break;
 177                                 case PCI_CLK_48:        timings = 0x00024241;   break;
 178                                 case PCI_CLK_66:        timings = 0x00035352;   break;
 179                         }
 180                         break;
 181                 case XFER_MW_DMA_2:
 182                         switch (pci_clock) {
 183                                 case PCI_CLK_33:        timings = 0x00002020;   break;
 184                                 case PCI_CLK_48:        timings = 0x00013131;   break;
 185                                 case PCI_CLK_66:        timings = 0x00015151;   break;
 186                         }
 187                         break;
 188                 default:
 189                         BUG();
 190                         break;
 191         }
 192
 193         if (unit == 0) {                        /* are we configuring drive0? */
 194                 pci_read_config_dword(hwif->pci_dev, basereg+4, &reg);
 195                 timings |= reg & 0x80000000;    /* preserve PIO format bit */
 196                 pci_write_config_dword(hwif->pci_dev, basereg+4, timings);
 197         } else {
 198                 pci_write_config_dword(hwif->pci_dev, basereg+12, timings);
 199         }
 200 }
 201
 202 /*  Replacement for the standard ide_dma_end action in
 203  *  dma_proc.
 204  *
 205  *  returns 1 on error, 0 otherwise
 206  */
 207 static int sc1200_ide_dma_end (ide_drive_t *drive)
 208 {
 209         ide_hwif_t *hwif = HWIF(drive);
 210         unsigned long dma_base = hwif->dma_base;
 211         byte dma_stat;
 212
 213         dma_stat = inb(dma_base+2);             /* get DMA status */
 214
 215         if (!(dma_stat & 4))
 216                 printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
 217                   dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));
 218
 219         outb(dma_stat|0x1b, dma_base+2);        /* clear the INTR & ERROR bits */
 220         outb(inb(dma_base)&~1, dma_base);       /* !! DO THIS HERE !! stop DMA */
 221
 222         drive->waiting_for_dma = 0;
 223         ide_destroy_dmatable(drive);            /* purge DMA mappings */
 224
 225         return (dma_stat & 7) != 4;             /* verify good DMA status */
 226 }
 227
 228 /*
 229  * sc1200_set_pio_mode() handles setting of PIO modes
 230  * for both the chipset and drive.
 231  *
 232  * All existing BIOSs for this chipset guarantee that all drives
 233  * will have valid default PIO timings set up before we get here.
 234  */
 235
 236 static void sc1200_set_pio_mode(ide_drive_t *drive, const u8 pio)
 237 {
 238         ide_hwif_t      *hwif = HWIF(drive);
 239         int             mode = -1;
 240
 241         /*
 242          * bad abuse of ->set_pio_mode interface
 243          */
 244         switch (pio) {
 245                 case 200: mode = XFER_UDMA_0;   break;
 246                 case 201: mode = XFER_UDMA_1;   break;
 247                 case 202: mode = XFER_UDMA_2;   break;
 248                 case 100: mode = XFER_MW_DMA_0; break;
 249                 case 101: mode = XFER_MW_DMA_1; break;
 250                 case 102: mode = XFER_MW_DMA_2; break;
 251         }
 252         if (mode != -1) {
 253                 printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
 254                 hwif->dma_off_quietly(drive);
 255                 if (ide_set_dma_mode(drive, mode) == 0)
 256                         hwif->dma_host_on(drive);
 257                 return;
 258         }
 259
 260         sc1200_tunepio(drive, pio);
 261 }
 262
 263 #ifdef CONFIG_PM
 264 static ide_hwif_t *lookup_pci_dev (ide_hwif_t *prev, struct pci_dev *dev)
 265 {
 266         int     h;
 267
 268         for (h = 0; h < MAX_HWIFS; h++) {
 269                 ide_hwif_t *hwif = &ide_hwifs[h];
 270                 if (prev) {
 271                         if (hwif == prev)
 272                                 prev = NULL;    // found previous, now look for next match
 273                 } else {
 274                         if (hwif && hwif->pci_dev == dev)
 275                                 return hwif;    // found next match
 276                 }
 277         }
 278         return NULL;    // not found
 279 }
 280
 281 typedef struct sc1200_saved_state_s {
 282         __u32           regs[4];
 283 } sc1200_saved_state_t;
 284
 285
 286 static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
 287 {
 288         ide_hwif_t              *hwif = NULL;
 289
 290         printk("SC1200: suspend(%u)\n", state.event);
 291
 292         if (state.event == PM_EVENT_ON) {
 293                 // we only save state when going from full power to less
 294
 295                 //
 296                 // Loop over all interfaces that are part of this PCI device:
 297                 //
 298                 while ((hwif = lookup_pci_dev(hwif, dev)) != NULL) {
 299                         sc1200_saved_state_t    *ss;
 300                         unsigned int            basereg, r;
 301                         //
 302                         // allocate a permanent save area, if not already allocated
 303                         //
 304                         ss = (sc1200_saved_state_t *)hwif->config_data;
 305                         if (ss == NULL) {
 306                                 ss = kmalloc(sizeof(sc1200_saved_state_t), GFP_KERNEL);
 307                                 if (ss == NULL)
 308                                         return -ENOMEM;
 309                                 hwif->config_data = (unsigned long)ss;
 310                         }
 311                         ss = (sc1200_saved_state_t *)hwif->config_data;
 312                         //
 313                         // Save timing registers:  this may be unnecessary if
 314                         // BIOS also does it
 315                         //
 316                         basereg = hwif->channel ? 0x50 : 0x40;
 317                         for (r = 0; r < 4; ++r) {
 318                                 pci_read_config_dword (hwif->pci_dev, basereg + (r<<2), &ss->regs[r]);
 319                         }
 320                 }
 321         }
 322
 323         /* You don't need to iterate over disks -- sysfs should have done that for you already */
 324
 325         pci_disable_device(dev);
 326         pci_set_power_state(dev, pci_choose_state(dev, state));
 327         return 0;
 328 }
 329
 330 static int sc1200_resume (struct pci_dev *dev)
 331 {
 332         ide_hwif_t      *hwif = NULL;
 333         int             i;
 334
 335         i = pci_enable_device(dev);
 336         if (i)
 337                 return i;
 338
 339         //
 340         // loop over all interfaces that are part of this pci device:
 341         //
 342         while ((hwif = lookup_pci_dev(hwif, dev)) != NULL) {
 343                 unsigned int            basereg, r;
 344                 sc1200_saved_state_t    *ss = (sc1200_saved_state_t *)hwif->config_data;
 345
 346                 //
 347                 // Restore timing registers:  this may be unnecessary if BIOS also does it
 348                 //
 349                 basereg = hwif->channel ? 0x50 : 0x40;
 350                 if (ss != NULL) {
 351                         for (r = 0; r < 4; ++r) {
 352                                 pci_write_config_dword(hwif->pci_dev, basereg + (r<<2), ss->regs[r]);
 353                         }
 354                 }
 355         }
 356         return 0;
 357 }
 358 #endif
 359
 360 /*
 361  * This gets invoked by the IDE driver once for each channel,
 362  * and performs channel-specific pre-initialization before drive probing.
 363  */
 364 static void __devinit init_hwif_sc1200 (ide_hwif_t *hwif)
 365 {
 366         hwif->set_pio_mode = &sc1200_set_pio_mode;
 367         hwif->set_dma_mode = &sc1200_set_dma_mode;
 368
 369         if (hwif->dma_base == 0)
 370                 return;
 371
 372         hwif->udma_filter = sc1200_udma_filter;
 373         hwif->ide_dma_end   = &sc1200_ide_dma_end;
 374 }
 375
 376 static const struct ide_port_info sc1200_chipset __devinitdata = {
 377         .name           = "SC1200",
 378         .init_hwif      = init_hwif_sc1200,
 379         .host_flags     = IDE_HFLAG_SERIALIZE |
 380                           IDE_HFLAG_POST_SET_MODE |
 381                           IDE_HFLAG_ABUSE_DMA_MODES |
 382                           IDE_HFLAG_BOOTABLE,
 383         .pio_mask       = ATA_PIO4,
 384         .mwdma_mask     = ATA_MWDMA2,
 385         .udma_mask      = ATA_UDMA2,
 386 };
 387
 388 static int __devinit sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 389 {
 390         return ide_setup_pci_device(dev, &sc1200_chipset);
 391 }
 392
 393 static const struct pci_device_id sc1200_pci_tbl[] = {
 394         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
 395         { 0, },
 396 };
 397 MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
 398
 399 static struct pci_driver driver = {
 400         .name           = "SC1200_IDE",
 401         .id_table       = sc1200_pci_tbl,
 402         .probe          = sc1200_init_one,
 403 #ifdef CONFIG_PM
 404         .suspend        = sc1200_suspend,
 405         .resume         = sc1200_resume,
 406 #endif
 407 };
 408
 409 static int __init sc1200_ide_init(void)
 410 {
 411         return ide_pci_register_driver(&driver);
 412 }
 413
 414 module_init(sc1200_ide_init);
 415
 416 MODULE_AUTHOR("Mark Lord");
 417 MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
 418 MODULE_LICENSE("GPL");