root/drivers/ata/pata_sil680.c

DEFINITIONS

1. sil680_selreg
2. sil680_seldev
3. sil680_cable_detect
4. sil680_set_piomode
5. sil680_set_dmamode
6. sil680_sff_exec_command
7. sil680_sff_irq_check
8. sil680_init_chip
9. sil680_init_one
10. sil680_reinit_one

   1 /*
   2  * pata_sil680.c        - SIL680 PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *
   5  * based upon
   6  *
   7  * linux/drivers/ide/pci/siimage.c              Version 1.07    Nov 30, 2003
   8  *
   9  * Copyright (C) 2001-2002      Andre Hedrick <andre@linux-ide.org>
  10  * Copyright (C) 2003           Red Hat <alan@redhat.com>
  11  *
  12  *  May be copied or modified under the terms of the GNU General Public License
  13  *
  14  *  Documentation publicly available.
  15  *
  16  *      If you have strange problems with nVidia chipset systems please
  17  *      see the SI support documentation and update your system BIOS
  18  *      if necessary
  19  *
  20  * TODO
  21  *      If we know all our devices are LBA28 (or LBA28 sized)  we could use
  22  *      the command fifo mode.
  23  */
  24 
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/pci.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/delay.h>
  30 #include <scsi/scsi_host.h>
  31 #include <linux/libata.h>
  32 
  33 #define DRV_NAME "pata_sil680"
  34 #define DRV_VERSION "0.4.9"
  35 
  36 #define SIL680_MMIO_BAR         5
  37 
  38 /**
  39  *      sil680_selreg           -       return register base
  40  *      @ap: ATA interface
  41  *      @r: config offset
  42  *
  43  *      Turn a config register offset into the right address in PCI space
  44  *      to access the control register in question.
  45  *
  46  *      Thankfully this is a configuration operation so isn't performance
  47  *      criticial.
  48  */
  49 
  50 static unsigned long sil680_selreg(struct ata_port *ap, int r)
  51 {
  52         unsigned long base = 0xA0 + r;
  53         base += (ap->port_no << 4);
  54         return base;
  55 }
  56 
  57 /**
  58  *      sil680_seldev           -       return register base
  59  *      @ap: ATA interface
  60  *      @r: config offset
  61  *
  62  *      Turn a config register offset into the right address in PCI space
  63  *      to access the control register in question including accounting for
  64  *      the unit shift.
  65  */
  66 
  67 static unsigned long sil680_seldev(struct ata_port *ap, struct ata_device *adev, int r)
  68 {
  69         unsigned long base = 0xA0 + r;
  70         base += (ap->port_no << 4);
  71         base |= adev->devno ? 2 : 0;
  72         return base;
  73 }
  74 
  75 
  76 /**
  77  *      sil680_cable_detect     -       cable detection
  78  *      @ap: ATA port
  79  *
  80  *      Perform cable detection. The SIL680 stores this in PCI config
  81  *      space for us.
  82  */
  83 
  84 static int sil680_cable_detect(struct ata_port *ap)
  85 {
  86         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  87         unsigned long addr = sil680_selreg(ap, 0);
  88         u8 ata66;
  89         pci_read_config_byte(pdev, addr, &ata66);
  90         if (ata66 & 1)
  91                 return ATA_CBL_PATA80;
  92         else
  93                 return ATA_CBL_PATA40;
  94 }
  95 
  96 /**
  97  *      sil680_set_piomode      -       set PIO mode data
  98  *      @ap: ATA interface
  99  *      @adev: ATA device
 100  *
 101  *      Program the SIL680 registers for PIO mode. Note that the task speed
 102  *      registers are shared between the devices so we must pick the lowest
 103  *      mode for command work.
 104  */
 105 
 106 static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
 107 {
 108         static const u16 speed_p[5] = {
 109                 0x328A, 0x2283, 0x1104, 0x10C3, 0x10C1
 110         };
 111         static const u16 speed_t[5] = {
 112                 0x328A, 0x2283, 0x1281, 0x10C3, 0x10C1
 113         };
 114 
 115         unsigned long tfaddr = sil680_selreg(ap, 0x02);
 116         unsigned long addr = sil680_seldev(ap, adev, 0x04);
 117         unsigned long addr_mask = 0x80 + 4 * ap->port_no;
 118         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 119         int pio = adev->pio_mode - XFER_PIO_0;
 120         int lowest_pio = pio;
 121         int port_shift = 4 * adev->devno;
 122         u16 reg;
 123         u8 mode;
 124 
 125         struct ata_device *pair = ata_dev_pair(adev);
 126 
 127         if (pair != NULL && adev->pio_mode > pair->pio_mode)
 128                 lowest_pio = pair->pio_mode - XFER_PIO_0;
 129 
 130         pci_write_config_word(pdev, addr, speed_p[pio]);
 131         pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);
 132 
 133         pci_read_config_word(pdev, tfaddr-2, &reg);
 134         pci_read_config_byte(pdev, addr_mask, &mode);
 135 
 136         reg &= ~0x0200;                 /* Clear IORDY */
 137         mode &= ~(3 << port_shift);     /* Clear IORDY and DMA bits */
 138 
 139         if (ata_pio_need_iordy(adev)) {
 140                 reg |= 0x0200;          /* Enable IORDY */
 141                 mode |= 1 << port_shift;
 142         }
 143         pci_write_config_word(pdev, tfaddr-2, reg);
 144         pci_write_config_byte(pdev, addr_mask, mode);
 145 }
 146 
 147 /**
 148  *      sil680_set_dmamode      -       set DMA mode data
 149  *      @ap: ATA interface
 150  *      @adev: ATA device
 151  *
 152  *      Program the MWDMA/UDMA modes for the sil680 chipset.
 153  *
 154  *      The MWDMA mode values are pulled from a lookup table
 155  *      while the chipset uses mode number for UDMA.
 156  */
 157 
 158 static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 159 {
 160         static const u8 ultra_table[2][7] = {
 161                 { 0x0C, 0x07, 0x05, 0x04, 0x02, 0x01, 0xFF },   /* 100MHz */
 162                 { 0x0F, 0x0B, 0x07, 0x05, 0x03, 0x02, 0x01 },   /* 133Mhz */
 163         };
 164         static const u16 dma_table[3] = { 0x2208, 0x10C2, 0x10C1 };
 165 
 166         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 167         unsigned long ma = sil680_seldev(ap, adev, 0x08);
 168         unsigned long ua = sil680_seldev(ap, adev, 0x0C);
 169         unsigned long addr_mask = 0x80 + 4 * ap->port_no;
 170         int port_shift = adev->devno * 4;
 171         u8 scsc, mode;
 172         u16 multi, ultra;
 173 
 174         pci_read_config_byte(pdev, 0x8A, &scsc);
 175         pci_read_config_byte(pdev, addr_mask, &mode);
 176         pci_read_config_word(pdev, ma, &multi);
 177         pci_read_config_word(pdev, ua, &ultra);
 178 
 179         /* Mask timing bits */
 180         ultra &= ~0x3F;
 181         mode &= ~(0x03 << port_shift);
 182 
 183         /* Extract scsc */
 184         scsc = (scsc & 0x30) ? 1 : 0;
 185 
 186         if (adev->dma_mode >= XFER_UDMA_0) {
 187                 multi = 0x10C1;
 188                 ultra |= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
 189                 mode |= (0x03 << port_shift);
 190         } else {
 191                 multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
 192                 mode |= (0x02 << port_shift);
 193         }
 194         pci_write_config_byte(pdev, addr_mask, mode);
 195         pci_write_config_word(pdev, ma, multi);
 196         pci_write_config_word(pdev, ua, ultra);
 197 }
 198 
 199 /**
 200  *      sil680_sff_exec_command - issue ATA command to host controller
 201  *      @ap: port to which command is being issued
 202  *      @tf: ATA taskfile register set
 203  *
 204  *      Issues ATA command, with proper synchronization with interrupt
 205  *      handler / other threads. Use our MMIO space for PCI posting to avoid
 206  *      a hideously slow cycle all the way to the device.
 207  *
 208  *      LOCKING:
 209  *      spin_lock_irqsave(host lock)
 210  */
 211 static void sil680_sff_exec_command(struct ata_port *ap,
 212                                     const struct ata_taskfile *tf)
 213 {
 214         DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
 215         iowrite8(tf->command, ap->ioaddr.command_addr);
 216         ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
 217 }
 218 
 219 static bool sil680_sff_irq_check(struct ata_port *ap)
 220 {
 221         struct pci_dev *pdev    = to_pci_dev(ap->host->dev);
 222         unsigned long addr      = sil680_selreg(ap, 1);
 223         u8 val;
 224 
 225         pci_read_config_byte(pdev, addr, &val);
 226 
 227         return val & 0x08;
 228 }
 229 
 230 static struct scsi_host_template sil680_sht = {
 231         ATA_BMDMA_SHT(DRV_NAME),
 232 };
 233 
 234 
 235 static struct ata_port_operations sil680_port_ops = {
 236         .inherits               = &ata_bmdma32_port_ops,
 237         .sff_exec_command       = sil680_sff_exec_command,
 238         .sff_irq_check          = sil680_sff_irq_check,
 239         .cable_detect           = sil680_cable_detect,
 240         .set_piomode            = sil680_set_piomode,
 241         .set_dmamode            = sil680_set_dmamode,
 242 };
 243 
 244 /**
 245  *      sil680_init_chip                -       chip setup
 246  *      @pdev: PCI device
 247  *
 248  *      Perform all the chip setup which must be done both when the device
 249  *      is powered up on boot and when we resume in case we resumed from RAM.
 250  *      Returns the final clock settings.
 251  */
 252 
 253 static u8 sil680_init_chip(struct pci_dev *pdev, int *try_mmio)
 254 {
 255         u8 tmpbyte      = 0;
 256 
 257         /* FIXME: double check */
 258         pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
 259                               pdev->revision ? 1 : 255);
 260 
 261         pci_write_config_byte(pdev, 0x80, 0x00);
 262         pci_write_config_byte(pdev, 0x84, 0x00);
 263 
 264         pci_read_config_byte(pdev, 0x8A, &tmpbyte);
 265 
 266         dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
 267                 tmpbyte & 1, tmpbyte & 0x30);
 268 
 269         *try_mmio = 0;
 270 #ifdef CONFIG_PPC
 271         if (machine_is(cell))
 272                 *try_mmio = (tmpbyte & 1) || pci_resource_start(pdev, 5);
 273 #endif
 274 
 275         switch (tmpbyte & 0x30) {
 276         case 0x00:
 277                 /* 133 clock attempt to force it on */
 278                 pci_write_config_byte(pdev, 0x8A, tmpbyte|0x10);
 279                 break;
 280         case 0x30:
 281                 /* if clocking is disabled */
 282                 /* 133 clock attempt to force it on */
 283                 pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
 284                 break;
 285         case 0x10:
 286                 /* 133 already */
 287                 break;
 288         case 0x20:
 289                 /* BIOS set PCI x2 clocking */
 290                 break;
 291         }
 292 
 293         pci_read_config_byte(pdev,   0x8A, &tmpbyte);
 294         dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
 295                 tmpbyte & 1, tmpbyte & 0x30);
 296 
 297         pci_write_config_byte(pdev,  0xA1, 0x72);
 298         pci_write_config_word(pdev,  0xA2, 0x328A);
 299         pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
 300         pci_write_config_dword(pdev, 0xA8, 0x43924392);
 301         pci_write_config_dword(pdev, 0xAC, 0x40094009);
 302         pci_write_config_byte(pdev,  0xB1, 0x72);
 303         pci_write_config_word(pdev,  0xB2, 0x328A);
 304         pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
 305         pci_write_config_dword(pdev, 0xB8, 0x43924392);
 306         pci_write_config_dword(pdev, 0xBC, 0x40094009);
 307 
 308         switch (tmpbyte & 0x30) {
 309         case 0x00:
 310                 printk(KERN_INFO "sil680: 100MHz clock.\n");
 311                 break;
 312         case 0x10:
 313                 printk(KERN_INFO "sil680: 133MHz clock.\n");
 314                 break;
 315         case 0x20:
 316                 printk(KERN_INFO "sil680: Using PCI clock.\n");
 317                 break;
 318         /* This last case is _NOT_ ok */
 319         case 0x30:
 320                 printk(KERN_ERR "sil680: Clock disabled ?\n");
 321         }
 322         return tmpbyte & 0x30;
 323 }
 324 
 325 static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 326 {
 327         static const struct ata_port_info info = {
 328                 .flags = ATA_FLAG_SLAVE_POSS,
 329                 .pio_mask = ATA_PIO4,
 330                 .mwdma_mask = ATA_MWDMA2,
 331                 .udma_mask = ATA_UDMA6,
 332                 .port_ops = &sil680_port_ops
 333         };
 334         static const struct ata_port_info info_slow = {
 335                 .flags = ATA_FLAG_SLAVE_POSS,
 336                 .pio_mask = ATA_PIO4,
 337                 .mwdma_mask = ATA_MWDMA2,
 338                 .udma_mask = ATA_UDMA5,
 339                 .port_ops = &sil680_port_ops
 340         };
 341         const struct ata_port_info *ppi[] = { &info, NULL };
 342         struct ata_host *host;
 343         void __iomem *mmio_base;
 344         int rc, try_mmio;
 345 
 346         ata_print_version_once(&pdev->dev, DRV_VERSION);
 347 
 348         rc = pcim_enable_device(pdev);
 349         if (rc)
 350                 return rc;
 351 
 352         switch (sil680_init_chip(pdev, &try_mmio)) {
 353                 case 0:
 354                         ppi[0] = &info_slow;
 355                         break;
 356                 case 0x30:
 357                         return -ENODEV;
 358         }
 359 
 360         if (!try_mmio)
 361                 goto use_ioports;
 362 
 363         /* Try to acquire MMIO resources and fallback to PIO if
 364          * that fails
 365          */
 366         rc = pcim_iomap_regions(pdev, 1 << SIL680_MMIO_BAR, DRV_NAME);
 367         if (rc)
 368                 goto use_ioports;
 369 
 370         /* Allocate host and set it up */
 371         host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
 372         if (!host)
 373                 return -ENOMEM;
 374         host->iomap = pcim_iomap_table(pdev);
 375 
 376         /* Setup DMA masks */
 377         rc = dma_set_mask_and_coherent(&pdev->dev, ATA_DMA_MASK);
 378         if (rc)
 379                 return rc;
 380         pci_set_master(pdev);
 381 
 382         /* Get MMIO base and initialize port addresses */
 383         mmio_base = host->iomap[SIL680_MMIO_BAR];
 384         host->ports[0]->ioaddr.bmdma_addr = mmio_base + 0x00;
 385         host->ports[0]->ioaddr.cmd_addr = mmio_base + 0x80;
 386         host->ports[0]->ioaddr.ctl_addr = mmio_base + 0x8a;
 387         host->ports[0]->ioaddr.altstatus_addr = mmio_base + 0x8a;
 388         ata_sff_std_ports(&host->ports[0]->ioaddr);
 389         host->ports[1]->ioaddr.bmdma_addr = mmio_base + 0x08;
 390         host->ports[1]->ioaddr.cmd_addr = mmio_base + 0xc0;
 391         host->ports[1]->ioaddr.ctl_addr = mmio_base + 0xca;
 392         host->ports[1]->ioaddr.altstatus_addr = mmio_base + 0xca;
 393         ata_sff_std_ports(&host->ports[1]->ioaddr);
 394 
 395         /* Register & activate */
 396         return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
 397                                  IRQF_SHARED, &sil680_sht);
 398 
 399 use_ioports:
 400         return ata_pci_bmdma_init_one(pdev, ppi, &sil680_sht, NULL, 0);
 401 }
 402 
 403 #ifdef CONFIG_PM_SLEEP
 404 static int sil680_reinit_one(struct pci_dev *pdev)
 405 {
 406         struct ata_host *host = pci_get_drvdata(pdev);
 407         int try_mmio, rc;
 408 
 409         rc = ata_pci_device_do_resume(pdev);
 410         if (rc)
 411                 return rc;
 412         sil680_init_chip(pdev, &try_mmio);
 413         ata_host_resume(host);
 414         return 0;
 415 }
 416 #endif
 417 
 418 static const struct pci_device_id sil680[] = {
 419         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
 420 
 421         { },
 422 };
 423 
 424 static struct pci_driver sil680_pci_driver = {
 425         .name           = DRV_NAME,
 426         .id_table       = sil680,
 427         .probe          = sil680_init_one,
 428         .remove         = ata_pci_remove_one,
 429 #ifdef CONFIG_PM_SLEEP
 430         .suspend        = ata_pci_device_suspend,
 431         .resume         = sil680_reinit_one,
 432 #endif
 433 };
 434 
 435 module_pci_driver(sil680_pci_driver);
 436 
 437 MODULE_AUTHOR("Alan Cox");
 438 MODULE_DESCRIPTION("low-level driver for SI680 PATA");
 439 MODULE_LICENSE("GPL");
 440 MODULE_DEVICE_TABLE(pci, sil680);
 441 MODULE_VERSION(DRV_VERSION);