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 publically 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 isnt 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 static struct scsi_host_template sil680_sht = {
 194         ATA_BMDMA_SHT(DRV_NAME),
 195 };
 196
 197 static struct ata_port_operations sil680_port_ops = {
 198         .inherits       = &ata_bmdma32_port_ops,
 199         .cable_detect   = sil680_cable_detect,
 200         .set_piomode    = sil680_set_piomode,
 201         .set_dmamode    = sil680_set_dmamode,
 202 };
 203
 204 /**
 205  *      sil680_init_chip                -       chip setup
 206  *      @pdev: PCI device
 207  *
 208  *      Perform all the chip setup which must be done both when the device
 209  *      is powered up on boot and when we resume in case we resumed from RAM.
 210  *      Returns the final clock settings.
 211  */
 212
 213 static u8 sil680_init_chip(struct pci_dev *pdev, int *try_mmio)
 214 {
 215         u32 class_rev   = 0;
 216         u8 tmpbyte      = 0;
 217
 218         pci_read_config_dword(pdev, PCI_CLASS_REVISION, &class_rev);
 219         class_rev &= 0xff;
 220         /* FIXME: double check */
 221         pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, (class_rev) ? 1 : 255);
 222
 223         pci_write_config_byte(pdev, 0x80, 0x00);
 224         pci_write_config_byte(pdev, 0x84, 0x00);
 225
 226         pci_read_config_byte(pdev, 0x8A, &tmpbyte);
 227
 228         dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
 229                 tmpbyte & 1, tmpbyte & 0x30);
 230
 231         *try_mmio = 0;
 232 #ifdef CONFIG_PPC
 233         if (machine_is(cell))
 234                 *try_mmio = (tmpbyte & 1) || pci_resource_start(pdev, 5);
 235 #endif
 236
 237         switch(tmpbyte & 0x30) {
 238                 case 0x00:
 239                         /* 133 clock attempt to force it on */
 240                         pci_write_config_byte(pdev, 0x8A, tmpbyte|0x10);
 241                         break;
 242                 case 0x30:
 243                         /* if clocking is disabled */
 244                         /* 133 clock attempt to force it on */
 245                         pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
 246                         break;
 247                 case 0x10:
 248                         /* 133 already */
 249                         break;
 250                 case 0x20:
 251                         /* BIOS set PCI x2 clocking */
 252                         break;
 253         }
 254
 255         pci_read_config_byte(pdev,   0x8A, &tmpbyte);
 256         dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
 257                 tmpbyte & 1, tmpbyte & 0x30);
 258
 259         pci_write_config_byte(pdev,  0xA1, 0x72);
 260         pci_write_config_word(pdev,  0xA2, 0x328A);
 261         pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
 262         pci_write_config_dword(pdev, 0xA8, 0x43924392);
 263         pci_write_config_dword(pdev, 0xAC, 0x40094009);
 264         pci_write_config_byte(pdev,  0xB1, 0x72);
 265         pci_write_config_word(pdev,  0xB2, 0x328A);
 266         pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
 267         pci_write_config_dword(pdev, 0xB8, 0x43924392);
 268         pci_write_config_dword(pdev, 0xBC, 0x40094009);
 269
 270         switch(tmpbyte & 0x30) {
 271                 case 0x00: printk(KERN_INFO "sil680: 100MHz clock.\n");break;
 272                 case 0x10: printk(KERN_INFO "sil680: 133MHz clock.\n");break;
 273                 case 0x20: printk(KERN_INFO "sil680: Using PCI clock.\n");break;
 274                 /* This last case is _NOT_ ok */
 275                 case 0x30: printk(KERN_ERR "sil680: Clock disabled ?\n");
 276         }
 277         return tmpbyte & 0x30;
 278 }
 279
 280 static int __devinit sil680_init_one(struct pci_dev *pdev,
 281                                      const struct pci_device_id *id)
 282 {
 283         static const struct ata_port_info info = {
 284                 .flags = ATA_FLAG_SLAVE_POSS,
 285                 .pio_mask = ATA_PIO4,
 286                 .mwdma_mask = ATA_MWDMA2,
 287                 .udma_mask = ATA_UDMA6,
 288                 .port_ops = &sil680_port_ops
 289         };
 290         static const struct ata_port_info info_slow = {
 291                 .flags = ATA_FLAG_SLAVE_POSS,
 292                 .pio_mask = ATA_PIO4,
 293                 .mwdma_mask = ATA_MWDMA2,
 294                 .udma_mask = ATA_UDMA5,
 295                 .port_ops = &sil680_port_ops
 296         };
 297         const struct ata_port_info *ppi[] = { &info, NULL };
 298         static int printed_version;
 299         struct ata_host *host;
 300         void __iomem *mmio_base;
 301         int rc, try_mmio;
 302
 303         if (!printed_version++)
 304                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 305
 306         rc = pcim_enable_device(pdev);
 307         if (rc)
 308                 return rc;
 309
 310         switch (sil680_init_chip(pdev, &try_mmio)) {
 311                 case 0:
 312                         ppi[0] = &info_slow;
 313                         break;
 314                 case 0x30:
 315                         return -ENODEV;
 316         }
 317
 318         if (!try_mmio)
 319                 goto use_ioports;
 320
 321         /* Try to acquire MMIO resources and fallback to PIO if
 322          * that fails
 323          */
 324         rc = pcim_iomap_regions(pdev, 1 << SIL680_MMIO_BAR, DRV_NAME);
 325         if (rc)
 326                 goto use_ioports;
 327
 328         /* Allocate host and set it up */
 329         host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
 330         if (!host)
 331                 return -ENOMEM;
 332         host->iomap = pcim_iomap_table(pdev);
 333
 334         /* Setup DMA masks */
 335         rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
 336         if (rc)
 337                 return rc;
 338         rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
 339         if (rc)
 340                 return rc;
 341         pci_set_master(pdev);
 342
 343         /* Get MMIO base and initialize port addresses */
 344         mmio_base = host->iomap[SIL680_MMIO_BAR];
 345         host->ports[0]->ioaddr.bmdma_addr = mmio_base + 0x00;
 346         host->ports[0]->ioaddr.cmd_addr = mmio_base + 0x80;
 347         host->ports[0]->ioaddr.ctl_addr = mmio_base + 0x8a;
 348         host->ports[0]->ioaddr.altstatus_addr = mmio_base + 0x8a;
 349         ata_sff_std_ports(&host->ports[0]->ioaddr);
 350         host->ports[1]->ioaddr.bmdma_addr = mmio_base + 0x08;
 351         host->ports[1]->ioaddr.cmd_addr = mmio_base + 0xc0;
 352         host->ports[1]->ioaddr.ctl_addr = mmio_base + 0xca;
 353         host->ports[1]->ioaddr.altstatus_addr = mmio_base + 0xca;
 354         ata_sff_std_ports(&host->ports[1]->ioaddr);
 355
 356         /* Register & activate */
 357         return ata_host_activate(host, pdev->irq, ata_sff_interrupt,
 358                                  IRQF_SHARED, &sil680_sht);
 359
 360 use_ioports:
 361         return ata_pci_sff_init_one(pdev, ppi, &sil680_sht, NULL);
 362 }
 363
 364 #ifdef CONFIG_PM
 365 static int sil680_reinit_one(struct pci_dev *pdev)
 366 {
 367         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 368         int try_mmio, rc;
 369
 370         rc = ata_pci_device_do_resume(pdev);
 371         if (rc)
 372                 return rc;
 373         sil680_init_chip(pdev, &try_mmio);
 374         ata_host_resume(host);
 375         return 0;
 376 }
 377 #endif
 378
 379 static const struct pci_device_id sil680[] = {
 380         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
 381
 382         { },
 383 };
 384
 385 static struct pci_driver sil680_pci_driver = {
 386         .name           = DRV_NAME,
 387         .id_table       = sil680,
 388         .probe          = sil680_init_one,
 389         .remove         = ata_pci_remove_one,
 390 #ifdef CONFIG_PM
 391         .suspend        = ata_pci_device_suspend,
 392         .resume         = sil680_reinit_one,
 393 #endif
 394 };
 395
 396 static int __init sil680_init(void)
 397 {
 398         return pci_register_driver(&sil680_pci_driver);
 399 }
 400
 401 static void __exit sil680_exit(void)
 402 {
 403         pci_unregister_driver(&sil680_pci_driver);
 404 }
 405
 406 MODULE_AUTHOR("Alan Cox");
 407 MODULE_DESCRIPTION("low-level driver for SI680 PATA");
 408 MODULE_LICENSE("GPL");
 409 MODULE_DEVICE_TABLE(pci, sil680);
 410 MODULE_VERSION(DRV_VERSION);
 411
 412 module_init(sil680_init);
 413 module_exit(sil680_exit);