drivers/ide/sc1200.c

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