drivers/ide/sl82c105.c

   1 /*
   2  * SL82C105/Winbond 553 IDE driver
   3  *
   4  * Maintainer unknown.
   5  *
   6  * Drive tuning added from Rebel.com's kernel sources
   7  *  -- Russell King (15/11/98) linux@arm.linux.org.uk
   8  *
   9  * Merge in Russell's HW workarounds, fix various problems
  10  * with the timing registers setup.
  11  *  -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org
  12  *
  13  * Copyright (C) 2006-2007,2009 MontaVista Software, Inc. <source@mvista.com>
  14  * Copyright (C)      2007 Bartlomiej Zolnierkiewicz
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/pci.h>
  21 #include <linux/ide.h>
  22
  23 #include <asm/io.h>
  24
  25 #define DRV_NAME "sl82c105"
  26
  27 /*
  28  * SL82C105 PCI config register 0x40 bits.
  29  */
  30 #define CTRL_IDE_IRQB   (1 << 30)
  31 #define CTRL_IDE_IRQA   (1 << 28)
  32 #define CTRL_LEGIRQ     (1 << 11)
  33 #define CTRL_P1F16      (1 << 5)
  34 #define CTRL_P1EN       (1 << 4)
  35 #define CTRL_P0F16      (1 << 1)
  36 #define CTRL_P0EN       (1 << 0)
  37
  38 /*
  39  * Convert a PIO mode and cycle time to the required on/off times
  40  * for the interface.  This has protection against runaway timings.
  41  */
  42 static unsigned int get_pio_timings(ide_drive_t *drive, u8 pio)
  43 {
  44         struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
  45         unsigned int cmd_on, cmd_off;
  46         u8 iordy = 0;
  47
  48         cmd_on  = (t->active + 29) / 30;
  49         cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30;
  50
  51         if (cmd_on == 0)
  52                 cmd_on = 1;
  53
  54         if (cmd_off == 0)
  55                 cmd_off = 1;
  56
  57         if (ide_pio_need_iordy(drive, pio))
  58                 iordy = 0x40;
  59
  60         return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy;
  61 }
  62
  63 /*
  64  * Configure the chipset for PIO mode.
  65  */
  66 static void sl82c105_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  67 {
  68         struct pci_dev *dev     = to_pci_dev(hwif->dev);
  69         unsigned long timings   = (unsigned long)ide_get_drivedata(drive);
  70         int reg                 = 0x44 + drive->dn * 4;
  71         u16 drv_ctrl;
  72         const u8 pio            = drive->pio_mode - XFER_PIO_0;
  73
  74         drv_ctrl = get_pio_timings(drive, pio);
  75
  76         /*
  77          * Store the PIO timings so that we can restore them
  78          * in case DMA will be turned off...
  79          */
  80         timings &= 0xffff0000;
  81         timings |= drv_ctrl;
  82         ide_set_drivedata(drive, (void *)timings);
  83
  84         pci_write_config_word(dev, reg,  drv_ctrl);
  85         pci_read_config_word (dev, reg, &drv_ctrl);
  86
  87         printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
  88                           ide_xfer_verbose(pio + XFER_PIO_0),
  89                           ide_pio_cycle_time(drive, pio), drv_ctrl);
  90 }
  91
  92 /*
  93  * Configure the chipset for DMA mode.
  94  */
  95 static void sl82c105_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  96 {
  97         static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
  98         unsigned long timings = (unsigned long)ide_get_drivedata(drive);
  99         u16 drv_ctrl;
 100         const u8 speed = drive->dma_mode;
 101
 102         drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];
 103
 104         /*
 105          * Store the DMA timings so that we can actually program
 106          * them when DMA will be turned on...
 107          */
 108         timings &= 0x0000ffff;
 109         timings |= (unsigned long)drv_ctrl << 16;
 110         ide_set_drivedata(drive, (void *)timings);
 111 }
 112
 113 static int sl82c105_test_irq(ide_hwif_t *hwif)
 114 {
 115         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 116         u32 val, mask           = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
 117
 118         pci_read_config_dword(dev, 0x40, &val);
 119
 120         return (val & mask) ? 1 : 0;
 121 }
 122
 123 /*
 124  * The SL82C105 holds off all IDE interrupts while in DMA mode until
 125  * all DMA activity is completed.  Sometimes this causes problems (eg,
 126  * when the drive wants to report an error condition).
 127  *
 128  * 0x7e is a "chip testing" register.  Bit 2 resets the DMA controller
 129  * state machine.  We need to kick this to work around various bugs.
 130  */
 131 static inline void sl82c105_reset_host(struct pci_dev *dev)
 132 {
 133         u16 val;
 134
 135         pci_read_config_word(dev, 0x7e, &val);
 136         pci_write_config_word(dev, 0x7e, val | (1 << 2));
 137         pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
 138 }
 139
 140 /*
 141  * If we get an IRQ timeout, it might be that the DMA state machine
 142  * got confused.  Fix from Todd Inglett.  Details from Winbond.
 143  *
 144  * This function is called when the IDE timer expires, the drive
 145  * indicates that it is READY, and we were waiting for DMA to complete.
 146  */
 147 static void sl82c105_dma_lost_irq(ide_drive_t *drive)
 148 {
 149         ide_hwif_t *hwif        = drive->hwif;
 150         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 151         u32 val, mask           = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
 152         u8 dma_cmd;
 153
 154         printk(KERN_WARNING "sl82c105: lost IRQ, resetting host\n");
 155
 156         /*
 157          * Check the raw interrupt from the drive.
 158          */
 159         pci_read_config_dword(dev, 0x40, &val);
 160         if (val & mask)
 161                 printk(KERN_INFO "sl82c105: drive was requesting IRQ, "
 162                        "but host lost it\n");
 163
 164         /*
 165          * Was DMA enabled?  If so, disable it - we're resetting the
 166          * host.  The IDE layer will be handling the drive for us.
 167          */
 168         dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
 169         if (dma_cmd & 1) {
 170                 outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
 171                 printk(KERN_INFO "sl82c105: DMA was enabled\n");
 172         }
 173
 174         sl82c105_reset_host(dev);
 175 }
 176
 177 /*
 178  * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
 179  * Winbond recommend that the DMA state machine is reset prior to
 180  * setting the bus master DMA enable bit.
 181  *
 182  * The generic IDE core will have disabled the BMEN bit before this
 183  * function is called.
 184  */
 185 static void sl82c105_dma_start(ide_drive_t *drive)
 186 {
 187         ide_hwif_t *hwif        = drive->hwif;
 188         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 189         int reg                 = 0x44 + drive->dn * 4;
 190
 191         pci_write_config_word(dev, reg,
 192                               (unsigned long)ide_get_drivedata(drive) >> 16);
 193
 194         sl82c105_reset_host(dev);
 195         ide_dma_start(drive);
 196 }
 197
 198 static void sl82c105_dma_clear(ide_drive_t *drive)
 199 {
 200         struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
 201
 202         sl82c105_reset_host(dev);
 203 }
 204
 205 static int sl82c105_dma_end(ide_drive_t *drive)
 206 {
 207         struct pci_dev *dev     = to_pci_dev(drive->hwif->dev);
 208         int reg                 = 0x44 + drive->dn * 4;
 209         int ret                 = ide_dma_end(drive);
 210
 211         pci_write_config_word(dev, reg,
 212                               (unsigned long)ide_get_drivedata(drive));
 213
 214         return ret;
 215 }
 216
 217 /*
 218  * ATA reset will clear the 16 bits mode in the control
 219  * register, we need to reprogram it
 220  */
 221 static void sl82c105_resetproc(ide_drive_t *drive)
 222 {
 223         struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
 224         u32 val;
 225
 226         pci_read_config_dword(dev, 0x40, &val);
 227         val |= (CTRL_P1F16 | CTRL_P0F16);
 228         pci_write_config_dword(dev, 0x40, val);
 229 }
 230
 231 /*
 232  * Return the revision of the Winbond bridge
 233  * which this function is part of.
 234  */
 235 static u8 sl82c105_bridge_revision(struct pci_dev *dev)
 236 {
 237         struct pci_dev *bridge;
 238
 239         /*
 240          * The bridge should be part of the same device, but function 0.
 241          */
 242         bridge = pci_get_bus_and_slot(dev->bus->number,
 243                                PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
 244         if (!bridge)
 245                 return -1;
 246
 247         /*
 248          * Make sure it is a Winbond 553 and is an ISA bridge.
 249          */
 250         if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
 251             bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
 252             bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
 253                 pci_dev_put(bridge);
 254                 return -1;
 255         }
 256         /*
 257          * We need to find function 0's revision, not function 1
 258          */
 259         pci_dev_put(bridge);
 260
 261         return bridge->revision;
 262 }
 263
 264 /*
 265  * Enable the PCI device
 266  *
 267  * --BenH: It's arch fixup code that should enable channels that
 268  * have not been enabled by firmware. I decided we can still enable
 269  * channel 0 here at least, but channel 1 has to be enabled by
 270  * firmware or arch code. We still set both to 16 bits mode.
 271  */
 272 static int init_chipset_sl82c105(struct pci_dev *dev)
 273 {
 274         u32 val;
 275
 276         pci_read_config_dword(dev, 0x40, &val);
 277         val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
 278         pci_write_config_dword(dev, 0x40, val);
 279
 280         return 0;
 281 }
 282
 283 static const struct ide_port_ops sl82c105_port_ops = {
 284         .set_pio_mode           = sl82c105_set_pio_mode,
 285         .set_dma_mode           = sl82c105_set_dma_mode,
 286         .resetproc              = sl82c105_resetproc,
 287         .test_irq               = sl82c105_test_irq,
 288 };
 289
 290 static const struct ide_dma_ops sl82c105_dma_ops = {
 291         .dma_host_set           = ide_dma_host_set,
 292         .dma_setup              = ide_dma_setup,
 293         .dma_start              = sl82c105_dma_start,
 294         .dma_end                = sl82c105_dma_end,
 295         .dma_test_irq           = ide_dma_test_irq,
 296         .dma_lost_irq           = sl82c105_dma_lost_irq,
 297         .dma_timer_expiry       = ide_dma_sff_timer_expiry,
 298         .dma_clear              = sl82c105_dma_clear,
 299         .dma_sff_read_status    = ide_dma_sff_read_status,
 300 };
 301
 302 static const struct ide_port_info sl82c105_chipset __devinitdata = {
 303         .name           = DRV_NAME,
 304         .init_chipset   = init_chipset_sl82c105,
 305         .enablebits     = {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
 306         .port_ops       = &sl82c105_port_ops,
 307         .dma_ops        = &sl82c105_dma_ops,
 308         .host_flags     = IDE_HFLAG_IO_32BIT |
 309                           IDE_HFLAG_UNMASK_IRQS |
 310                           IDE_HFLAG_SERIALIZE_DMA |
 311                           IDE_HFLAG_NO_AUTODMA,
 312         .pio_mask       = ATA_PIO5,
 313         .mwdma_mask     = ATA_MWDMA2,
 314 };
 315
 316 static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 317 {
 318         struct ide_port_info d = sl82c105_chipset;
 319         u8 rev = sl82c105_bridge_revision(dev);
 320
 321         if (rev <= 5) {
 322                 /*
 323                  * Never ever EVER under any circumstances enable
 324                  * DMA when the bridge is this old.
 325                  */
 326                 printk(KERN_INFO DRV_NAME ": Winbond W83C553 bridge "
 327                                  "revision %d, BM-DMA disabled\n", rev);
 328                 d.dma_ops = NULL;
 329                 d.mwdma_mask = 0;
 330                 d.host_flags &= ~IDE_HFLAG_SERIALIZE_DMA;
 331         }
 332
 333         return ide_pci_init_one(dev, &d, NULL);
 334 }
 335
 336 static const struct pci_device_id sl82c105_pci_tbl[] = {
 337         { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0 },
 338         { 0, },
 339 };
 340 MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);
 341
 342 static struct pci_driver sl82c105_pci_driver = {
 343         .name           = "W82C105_IDE",
 344         .id_table       = sl82c105_pci_tbl,
 345         .probe          = sl82c105_init_one,
 346         .remove         = ide_pci_remove,
 347         .suspend        = ide_pci_suspend,
 348         .resume         = ide_pci_resume,
 349 };
 350
 351 static int __init sl82c105_ide_init(void)
 352 {
 353         return ide_pci_register_driver(&sl82c105_pci_driver);
 354 }
 355
 356 static void __exit sl82c105_ide_exit(void)
 357 {
 358         pci_unregister_driver(&sl82c105_pci_driver);
 359 }
 360
 361 module_init(sl82c105_ide_init);
 362 module_exit(sl82c105_ide_exit);
 363
 364 MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
 365 MODULE_LICENSE("GPL");