drivers/ata/pata_sil680.c

   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/init.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/delay.h>
  31 #include <scsi/scsi_host.h>
  32 #include <linux/libata.h>
  33
  34 #define DRV_NAME "pata_sil680"
  35 #define DRV_VERSION "0.4.9"
  36
  37 #define SIL680_MMIO_BAR         5
  38
  39 /**
  40  *      sil680_selreg           -       return register base
  41  *      @hwif: interface
  42  *      @r: config offset
  43  *
  44  *      Turn a config register offset into the right address in either
  45  *      PCI space or MMIO space to access the control register in question
  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  *      @hwif: interface
  60  *      @r: config offset
  61  *
  62  *      Turn a config register offset into the right address in either
  63  *      PCI space or MMIO space to access the control register in question
  64  *      including accounting for 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         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  86         unsigned long addr = sil680_selreg(ap, 0);
  87         u8 ata66;
  88         pci_read_config_byte(pdev, addr, &ata66);
  89         if (ata66 & 1)
  90                 return ATA_CBL_PATA80;
  91         else
  92                 return ATA_CBL_PATA40;
  93 }
  94
  95 /**
  96  *      sil680_set_piomode      -       set initial PIO mode data
  97  *      @ap: ATA interface
  98  *      @adev: ATA device
  99  *
 100  *      Program the SIL680 registers for PIO mode. Note that the task speed
 101  *      registers are shared between the devices so we must pick the lowest
 102  *      mode for command work.
 103  */
 104
 105 static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
 106 {
 107         static u16 speed_p[5] = { 0x328A, 0x2283, 0x1104, 0x10C3, 0x10C1 };
 108         static u16 speed_t[5] = { 0x328A, 0x2283, 0x1281, 0x10C3, 0x10C1 };
 109
 110         unsigned long tfaddr = sil680_selreg(ap, 0x02);
 111         unsigned long addr = sil680_seldev(ap, adev, 0x04);
 112         unsigned long addr_mask = 0x80 + 4 * ap->port_no;
 113         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 114         int pio = adev->pio_mode - XFER_PIO_0;
 115         int lowest_pio = pio;
 116         int port_shift = 4 * adev->devno;
 117         u16 reg;
 118         u8 mode;
 119
 120         struct ata_device *pair = ata_dev_pair(adev);
 121
 122         if (pair != NULL && adev->pio_mode > pair->pio_mode)
 123                 lowest_pio = pair->pio_mode - XFER_PIO_0;
 124
 125         pci_write_config_word(pdev, addr, speed_p[pio]);
 126         pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);
 127
 128         pci_read_config_word(pdev, tfaddr-2, &reg);
 129         pci_read_config_byte(pdev, addr_mask, &mode);
 130
 131         reg &= ~0x0200;                 /* Clear IORDY */
 132         mode &= ~(3 << port_shift);     /* Clear IORDY and DMA bits */
 133
 134         if (ata_pio_need_iordy(adev)) {
 135                 reg |= 0x0200;          /* Enable IORDY */
 136                 mode |= 1 << port_shift;
 137         }
 138         pci_write_config_word(pdev, tfaddr-2, reg);
 139         pci_write_config_byte(pdev, addr_mask, mode);
 140 }
 141
 142 /**
 143  *      sil680_set_dmamode      -       set initial DMA mode data
 144  *      @ap: ATA interface
 145  *      @adev: ATA device
 146  *
 147  *      Program the MWDMA/UDMA modes for the sil680 k
 148  *      chipset. The MWDMA mode values are pulled from a lookup table
 149  *      while the chipset uses mode number for UDMA.
 150  */
 151
 152 static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 153 {
 154         static u8 ultra_table[2][7] = {
 155                 { 0x0C, 0x07, 0x05, 0x04, 0x02, 0x01, 0xFF },   /* 100MHz */
 156                 { 0x0F, 0x0B, 0x07, 0x05, 0x03, 0x02, 0x01 },   /* 133Mhz */
 157         };
 158         static u16 dma_table[3] = { 0x2208, 0x10C2, 0x10C1 };
 159
 160         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 161         unsigned long ma = sil680_seldev(ap, adev, 0x08);
 162         unsigned long ua = sil680_seldev(ap, adev, 0x0C);
 163         unsigned long addr_mask = 0x80 + 4 * ap->port_no;
 164         int port_shift = adev->devno * 4;
 165         u8 scsc, mode;
 166         u16 multi, ultra;
 167
 168         pci_read_config_byte(pdev, 0x8A, &scsc);
 169         pci_read_config_byte(pdev, addr_mask, &mode);
 170         pci_read_config_word(pdev, ma, &multi);
 171         pci_read_config_word(pdev, ua, &ultra);
 172
 173         /* Mask timing bits */
 174         ultra &= ~0x3F;
 175         mode &= ~(0x03 << port_shift);
 176
 177         /* Extract scsc */
 178         scsc = (scsc & 0x30) ? 1: 0;
 179
 180         if (adev->dma_mode >= XFER_UDMA_0) {
 181                 multi = 0x10C1;
 182                 ultra |= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
 183                 mode |= (0x03 << port_shift);
 184         } else {
 185                 multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
 186                 mode |= (0x02 << port_shift);
 187         }
 188         pci_write_config_byte(pdev, addr_mask, mode);
 189         pci_write_config_word(pdev, ma, multi);
 190         pci_write_config_word(pdev, ua, ultra);
 191 }
 192
 193 /**
 194  *      sil680_sff_exec_command - issue ATA command to host controller
 195  *      @ap: port to which command is being issued
 196  *      @tf: ATA taskfile register set
 197  *
 198  *      Issues ATA command, with proper synchronization with interrupt
 199  *      handler / other threads. Use our MMIO space for PCI posting to avoid
 200  *      a hideously slow cycle all the way to the device.
 201  *
 202  *      LOCKING:
 203  *      spin_lock_irqsave(host lock)
 204  */
 205 static void sil680_sff_exec_command(struct ata_port *ap,
 206                                     const struct ata_taskfile *tf)
 207 {
 208         DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
 209         iowrite8(tf->command, ap->ioaddr.command_addr);
 210         ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
 211 }
 212
 213 static bool sil680_sff_irq_check(struct ata_port *ap)
 214 {
 215         struct pci_dev *pdev    = to_pci_dev(ap->host->dev);
 216         unsigned long addr      = sil680_selreg(ap, 1);
 217         u8 val;
 218
 219         pci_read_config_byte(pdev, addr, &val);
 220
 221         return val & 0x08;
 222 }
 223
 224 static struct scsi_host_template sil680_sht = {
 225         ATA_BMDMA_SHT(DRV_NAME),
 226 };
 227
 228
 229 static struct ata_port_operations sil680_port_ops = {
 230         .inherits               = &ata_bmdma32_port_ops,
 231         .sff_exec_command       = sil680_sff_exec_command,
 232         .sff_irq_check          = sil680_sff_irq_check,
 233         .cable_detect           = sil680_cable_detect,
 234         .set_piomode            = sil680_set_piomode,
 235         .set_dmamode            = sil680_set_dmamode,
 236 };
 237
 238 /**
 239  *      sil680_init_chip                -       chip setup
 240  *      @pdev: PCI device
 241  *
 242  *      Perform all the chip setup which must be done both when the device
 243  *      is powered up on boot and when we resume in case we resumed from RAM.
 244  *      Returns the final clock settings.
 245  */
 246
 247 static u8 sil680_init_chip(struct pci_dev *pdev, int *try_mmio)
 248 {
 249         u8 tmpbyte      = 0;
 250
 251         /* FIXME: double check */
 252         pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
 253                               pdev->revision ? 1 : 255);
 254
 255         pci_write_config_byte(pdev, 0x80, 0x00);
 256         pci_write_config_byte(pdev, 0x84, 0x00);
 257
 258         pci_read_config_byte(pdev, 0x8A, &tmpbyte);
 259
 260         dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
 261                 tmpbyte & 1, tmpbyte & 0x30);
 262
 263         *try_mmio = 0;
 264 #ifdef CONFIG_PPC
 265         if (machine_is(cell))
 266                 *try_mmio = (tmpbyte & 1) || pci_resource_start(pdev, 5);
 267 #endif
 268
 269         switch(tmpbyte & 0x30) {
 270                 case 0x00:
 271                         /* 133 clock attempt to force it on */
 272                         pci_write_config_byte(pdev, 0x8A, tmpbyte|0x10);
 273                         break;
 274                 case 0x30:
 275                         /* if clocking is disabled */
 276                         /* 133 clock attempt to force it on */
 277                         pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
 278                         break;
 279                 case 0x10:
 280                         /* 133 already */
 281                         break;
 282                 case 0x20:
 283                         /* BIOS set PCI x2 clocking */
 284                         break;
 285         }
 286
 287         pci_read_config_byte(pdev,   0x8A, &tmpbyte);
 288         dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
 289                 tmpbyte & 1, tmpbyte & 0x30);
 290
 291         pci_write_config_byte(pdev,  0xA1, 0x72);
 292         pci_write_config_word(pdev,  0xA2, 0x328A);
 293         pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
 294         pci_write_config_dword(pdev, 0xA8, 0x43924392);
 295         pci_write_config_dword(pdev, 0xAC, 0x40094009);
 296         pci_write_config_byte(pdev,  0xB1, 0x72);
 297         pci_write_config_word(pdev,  0xB2, 0x328A);
 298         pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
 299         pci_write_config_dword(pdev, 0xB8, 0x43924392);
 300         pci_write_config_dword(pdev, 0xBC, 0x40094009);
 301
 302         switch(tmpbyte & 0x30) {
 303                 case 0x00: printk(KERN_INFO "sil680: 100MHz clock.\n");break;
 304                 case 0x10: printk(KERN_INFO "sil680: 133MHz clock.\n");break;
 305                 case 0x20: printk(KERN_INFO "sil680: Using PCI clock.\n");break;
 306                 /* This last case is _NOT_ ok */
 307                 case 0x30: printk(KERN_ERR "sil680: Clock disabled ?\n");
 308         }
 309         return tmpbyte & 0x30;
 310 }
 311
 312 static int __devinit sil680_init_one(struct pci_dev *pdev,
 313                                      const struct pci_device_id *id)
 314 {
 315         static const struct ata_port_info info = {
 316                 .flags = ATA_FLAG_SLAVE_POSS,
 317                 .pio_mask = ATA_PIO4,
 318                 .mwdma_mask = ATA_MWDMA2,
 319                 .udma_mask = ATA_UDMA6,
 320                 .port_ops = &sil680_port_ops
 321         };
 322         static const struct ata_port_info info_slow = {
 323                 .flags = ATA_FLAG_SLAVE_POSS,
 324                 .pio_mask = ATA_PIO4,
 325                 .mwdma_mask = ATA_MWDMA2,
 326                 .udma_mask = ATA_UDMA5,
 327                 .port_ops = &sil680_port_ops
 328         };
 329         const struct ata_port_info *ppi[] = { &info, NULL };
 330         static int printed_version;
 331         struct ata_host *host;
 332         void __iomem *mmio_base;
 333         int rc, try_mmio;
 334
 335         if (!printed_version++)
 336                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 337
 338         rc = pcim_enable_device(pdev);
 339         if (rc)
 340                 return rc;
 341
 342         switch (sil680_init_chip(pdev, &try_mmio)) {
 343                 case 0:
 344                         ppi[0] = &info_slow;
 345                         break;
 346                 case 0x30:
 347                         return -ENODEV;
 348         }
 349
 350         if (!try_mmio)
 351                 goto use_ioports;
 352
 353         /* Try to acquire MMIO resources and fallback to PIO if
 354          * that fails
 355          */
 356         rc = pcim_iomap_regions(pdev, 1 << SIL680_MMIO_BAR, DRV_NAME);
 357         if (rc)
 358                 goto use_ioports;
 359
 360         /* Allocate host and set it up */
 361         host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
 362         if (!host)
 363                 return -ENOMEM;
 364         host->iomap = pcim_iomap_table(pdev);
 365
 366         /* Setup DMA masks */
 367         rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
 368         if (rc)
 369                 return rc;
 370         rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
 371         if (rc)
 372                 return rc;
 373         pci_set_master(pdev);
 374
 375         /* Get MMIO base and initialize port addresses */
 376         mmio_base = host->iomap[SIL680_MMIO_BAR];
 377         host->ports[0]->ioaddr.bmdma_addr = mmio_base + 0x00;
 378         host->ports[0]->ioaddr.cmd_addr = mmio_base + 0x80;
 379         host->ports[0]->ioaddr.ctl_addr = mmio_base + 0x8a;
 380         host->ports[0]->ioaddr.altstatus_addr = mmio_base + 0x8a;
 381         ata_sff_std_ports(&host->ports[0]->ioaddr);
 382         host->ports[1]->ioaddr.bmdma_addr = mmio_base + 0x08;
 383         host->ports[1]->ioaddr.cmd_addr = mmio_base + 0xc0;
 384         host->ports[1]->ioaddr.ctl_addr = mmio_base + 0xca;
 385         host->ports[1]->ioaddr.altstatus_addr = mmio_base + 0xca;
 386         ata_sff_std_ports(&host->ports[1]->ioaddr);
 387
 388         /* Register & activate */
 389         return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
 390                                  IRQF_SHARED, &sil680_sht);
 391
 392 use_ioports:
 393         return ata_pci_bmdma_init_one(pdev, ppi, &sil680_sht, NULL, 0);
 394 }
 395
 396 #ifdef CONFIG_PM
 397 static int sil680_reinit_one(struct pci_dev *pdev)
 398 {
 399         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 400         int try_mmio, rc;
 401
 402         rc = ata_pci_device_do_resume(pdev);
 403         if (rc)
 404                 return rc;
 405         sil680_init_chip(pdev, &try_mmio);
 406         ata_host_resume(host);
 407         return 0;
 408 }
 409 #endif
 410
 411 static const struct pci_device_id sil680[] = {
 412         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
 413
 414         { },
 415 };
 416
 417 static struct pci_driver sil680_pci_driver = {
 418         .name           = DRV_NAME,
 419         .id_table       = sil680,
 420         .probe          = sil680_init_one,
 421         .remove         = ata_pci_remove_one,
 422 #ifdef CONFIG_PM
 423         .suspend        = ata_pci_device_suspend,
 424         .resume         = sil680_reinit_one,
 425 #endif
 426 };
 427
 428 static int __init sil680_init(void)
 429 {
 430         return pci_register_driver(&sil680_pci_driver);
 431 }
 432
 433 static void __exit sil680_exit(void)
 434 {
 435         pci_unregister_driver(&sil680_pci_driver);
 436 }
 437
 438 MODULE_AUTHOR("Alan Cox");
 439 MODULE_DESCRIPTION("low-level driver for SI680 PATA");
 440 MODULE_LICENSE("GPL");
 441 MODULE_DEVICE_TABLE(pci, sil680);
 442 MODULE_VERSION(DRV_VERSION);
 443
 444 module_init(sil680_init);
 445 module_exit(sil680_exit);