drivers/ata/pata_sil680.c

   1 /*
   2  * pata_sil680.c        - SIL680 PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *                        Alan Cox <alan@redhat.com>
   5  *
   6  * based upon
   7  *
   8  * linux/drivers/ide/pci/siimage.c              Version 1.07    Nov 30, 2003
   9  *
  10  * Copyright (C) 2001-2002      Andre Hedrick <andre@linux-ide.org>
  11  * Copyright (C) 2003           Red Hat <alan@redhat.com>
  12  *
  13  *  May be copied or modified under the terms of the GNU General Public License
  14  *
  15  *  Documentation publically available.
  16  *
  17  *      If you have strange problems with nVidia chipset systems please
  18  *      see the SI support documentation and update your system BIOS
  19  *      if neccessary
  20  *
  21  * TODO
  22  *      If we know all our devices are LBA28 (or LBA28 sized)  we could use
  23  *      the command fifo mode.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/pci.h>
  29 #include <linux/init.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/delay.h>
  32 #include <scsi/scsi_host.h>
  33 #include <linux/libata.h>
  34
  35 #define DRV_NAME "pata_sil680"
  36 #define DRV_VERSION "0.3.2"
  37
  38 /**
  39  *      sil680_selreg           -       return register base
  40  *      @hwif: interface
  41  *      @r: config offset
  42  *
  43  *      Turn a config register offset into the right address in either
  44  *      PCI space or MMIO space to access the control register in question
  45  *      Thankfully this is a configuration operation so isnt performance
  46  *      criticial.
  47  */
  48
  49 static unsigned long sil680_selreg(struct ata_port *ap, int r)
  50 {
  51         unsigned long base = 0xA0 + r;
  52         base += (ap->port_no << 4);
  53         return base;
  54 }
  55
  56 /**
  57  *      sil680_seldev           -       return register base
  58  *      @hwif: interface
  59  *      @r: config offset
  60  *
  61  *      Turn a config register offset into the right address in either
  62  *      PCI space or MMIO space to access the control register in question
  63  *      including accounting for the unit shift.
  64  */
  65
  66 static unsigned long sil680_seldev(struct ata_port *ap, struct ata_device *adev, int r)
  67 {
  68         unsigned long base = 0xA0 + r;
  69         base += (ap->port_no << 4);
  70         base |= adev->devno ? 2 : 0;
  71         return base;
  72 }
  73
  74
  75 /**
  76  *      sil680_cable_detect     -       cable detection
  77  *      @ap: ATA port
  78  *
  79  *      Perform cable detection. The SIL680 stores this in PCI config
  80  *      space for us.
  81  */
  82
  83 static int sil680_cable_detect(struct ata_port *ap) {
  84         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  85         unsigned long addr = sil680_selreg(ap, 0);
  86         u8 ata66;
  87         pci_read_config_byte(pdev, addr, &ata66);
  88         if (ata66 & 1)
  89                 return ATA_CBL_PATA80;
  90         else
  91                 return ATA_CBL_PATA40;
  92 }
  93
  94 static int sil680_pre_reset(struct ata_port *ap)
  95 {
  96         ap->cbl = sil680_cable_detect(ap);
  97         return ata_std_prereset(ap);
  98 }
  99
 100 /**
 101  *      sil680_bus_reset        -       reset the SIL680 bus
 102  *      @ap: ATA port to reset
 103  *
 104  *      Perform the SIL680 housekeeping when doing an ATA bus reset
 105  */
 106
 107 static int sil680_bus_reset(struct ata_port *ap,unsigned int *classes)
 108 {
 109         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 110         unsigned long addr = sil680_selreg(ap, 0);
 111         u8 reset;
 112
 113         pci_read_config_byte(pdev, addr, &reset);
 114         pci_write_config_byte(pdev, addr, reset | 0x03);
 115         udelay(25);
 116         pci_write_config_byte(pdev, addr, reset);
 117         return ata_std_softreset(ap, classes);
 118 }
 119
 120 static void sil680_error_handler(struct ata_port *ap)
 121 {
 122         ata_bmdma_drive_eh(ap, sil680_pre_reset, sil680_bus_reset, NULL, ata_std_postreset);
 123 }
 124
 125 /**
 126  *      sil680_set_piomode      -       set initial PIO mode data
 127  *      @ap: ATA interface
 128  *      @adev: ATA device
 129  *
 130  *      Program the SIL680 registers for PIO mode. Note that the task speed
 131  *      registers are shared between the devices so we must pick the lowest
 132  *      mode for command work.
 133  */
 134
 135 static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
 136 {
 137         static u16 speed_p[5] = { 0x328A, 0x2283, 0x1104, 0x10C3, 0x10C1 };
 138         static u16 speed_t[5] = { 0x328A, 0x1281, 0x1281, 0x10C3, 0x10C1 };
 139
 140         unsigned long tfaddr = sil680_selreg(ap, 0x02);
 141         unsigned long addr = sil680_seldev(ap, adev, 0x04);
 142         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 143         int pio = adev->pio_mode - XFER_PIO_0;
 144         int lowest_pio = pio;
 145         u16 reg;
 146
 147         struct ata_device *pair = ata_dev_pair(adev);
 148
 149         if (pair != NULL && adev->pio_mode > pair->pio_mode)
 150                 lowest_pio = pair->pio_mode - XFER_PIO_0;
 151
 152         pci_write_config_word(pdev, addr, speed_p[pio]);
 153         pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);
 154
 155         pci_read_config_word(pdev, tfaddr-2, &reg);
 156         reg &= ~0x0200;                 /* Clear IORDY */
 157         if (ata_pio_need_iordy(adev))
 158                 reg |= 0x0200;          /* Enable IORDY */
 159         pci_write_config_word(pdev, tfaddr-2, reg);
 160 }
 161
 162 /**
 163  *      sil680_set_dmamode      -       set initial DMA mode data
 164  *      @ap: ATA interface
 165  *      @adev: ATA device
 166  *
 167  *      Program the MWDMA/UDMA modes for the sil680 k
 168  *      chipset. The MWDMA mode values are pulled from a lookup table
 169  *      while the chipset uses mode number for UDMA.
 170  */
 171
 172 static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 173 {
 174         static u8 ultra_table[2][7] = {
 175                 { 0x0C, 0x07, 0x05, 0x04, 0x02, 0x01, 0xFF },   /* 100MHz */
 176                 { 0x0F, 0x0B, 0x07, 0x05, 0x03, 0x02, 0x01 },   /* 133Mhz */
 177         };
 178         static u16 dma_table[3] = { 0x2208, 0x10C2, 0x10C1 };
 179
 180         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 181         unsigned long ma = sil680_seldev(ap, adev, 0x08);
 182         unsigned long ua = sil680_seldev(ap, adev, 0x0C);
 183         unsigned long addr_mask = 0x80 + 4 * ap->port_no;
 184         int port_shift = adev->devno * 4;
 185         u8 scsc, mode;
 186         u16 multi, ultra;
 187
 188         pci_read_config_byte(pdev, 0x8A, &scsc);
 189         pci_read_config_byte(pdev, addr_mask, &mode);
 190         pci_read_config_word(pdev, ma, &multi);
 191         pci_read_config_word(pdev, ua, &ultra);
 192
 193         /* Mask timing bits */
 194         ultra &= ~0x3F;
 195         mode &= ~(0x03 << port_shift);
 196
 197         /* Extract scsc */
 198         scsc = (scsc & 0x30) ? 1: 0;
 199
 200         if (adev->dma_mode >= XFER_UDMA_0) {
 201                 multi = 0x10C1;
 202                 ultra |= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
 203                 mode |= (0x03 << port_shift);
 204         } else {
 205                 multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
 206                 mode |= (0x02 << port_shift);
 207         }
 208         pci_write_config_byte(pdev, addr_mask, mode);
 209         pci_write_config_word(pdev, ma, multi);
 210         pci_write_config_word(pdev, ua, ultra);
 211 }
 212
 213 static struct scsi_host_template sil680_sht = {
 214         .module                 = THIS_MODULE,
 215         .name                   = DRV_NAME,
 216         .ioctl                  = ata_scsi_ioctl,
 217         .queuecommand           = ata_scsi_queuecmd,
 218         .can_queue              = ATA_DEF_QUEUE,
 219         .this_id                = ATA_SHT_THIS_ID,
 220         .sg_tablesize           = LIBATA_MAX_PRD,
 221         .max_sectors            = ATA_MAX_SECTORS,
 222         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 223         .emulated               = ATA_SHT_EMULATED,
 224         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 225         .proc_name              = DRV_NAME,
 226         .dma_boundary           = ATA_DMA_BOUNDARY,
 227         .slave_configure        = ata_scsi_slave_config,
 228         .bios_param             = ata_std_bios_param,
 229 };
 230
 231 static struct ata_port_operations sil680_port_ops = {
 232         .port_disable   = ata_port_disable,
 233         .set_piomode    = sil680_set_piomode,
 234         .set_dmamode    = sil680_set_dmamode,
 235         .mode_filter    = ata_pci_default_filter,
 236         .tf_load        = ata_tf_load,
 237         .tf_read        = ata_tf_read,
 238         .check_status   = ata_check_status,
 239         .exec_command   = ata_exec_command,
 240         .dev_select     = ata_std_dev_select,
 241
 242         .freeze         = ata_bmdma_freeze,
 243         .thaw           = ata_bmdma_thaw,
 244         .error_handler  = sil680_error_handler,
 245         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 246
 247         .bmdma_setup    = ata_bmdma_setup,
 248         .bmdma_start    = ata_bmdma_start,
 249         .bmdma_stop     = ata_bmdma_stop,
 250         .bmdma_status   = ata_bmdma_status,
 251
 252         .qc_prep        = ata_qc_prep,
 253         .qc_issue       = ata_qc_issue_prot,
 254
 255         .data_xfer      = ata_pio_data_xfer,
 256
 257         .irq_handler    = ata_interrupt,
 258         .irq_clear      = ata_bmdma_irq_clear,
 259
 260         .port_start     = ata_port_start,
 261         .port_stop      = ata_port_stop,
 262         .host_stop      = ata_host_stop
 263 };
 264
 265 static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 266 {
 267         static struct ata_port_info info = {
 268                 .sht = &sil680_sht,
 269                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 270                 .pio_mask = 0x1f,
 271                 .mwdma_mask = 0x07,
 272                 .udma_mask = 0x7f,
 273                 .port_ops = &sil680_port_ops
 274         };
 275         static struct ata_port_info info_slow = {
 276                 .sht = &sil680_sht,
 277                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 278                 .pio_mask = 0x1f,
 279                 .mwdma_mask = 0x07,
 280                 .udma_mask = 0x3f,
 281                 .port_ops = &sil680_port_ops
 282         };
 283         static struct ata_port_info *port_info[2] = {&info, &info};
 284         static int printed_version;
 285         u32 class_rev   = 0;
 286         u8 tmpbyte      = 0;
 287
 288         if (!printed_version++)
 289                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 290
 291         pci_read_config_dword(pdev, PCI_CLASS_REVISION, &class_rev);
 292         class_rev &= 0xff;
 293         /* FIXME: double check */
 294         pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, (class_rev) ? 1 : 255);
 295
 296         pci_write_config_byte(pdev, 0x80, 0x00);
 297         pci_write_config_byte(pdev, 0x84, 0x00);
 298
 299         pci_read_config_byte(pdev, 0x8A, &tmpbyte);
 300
 301         printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
 302                         tmpbyte & 1, tmpbyte & 0x30);
 303
 304         switch(tmpbyte & 0x30) {
 305                 case 0x00:
 306                         /* 133 clock attempt to force it on */
 307                         pci_write_config_byte(pdev, 0x8A, tmpbyte|0x10);
 308                         break;
 309                 case 0x30:
 310                         /* if clocking is disabled */
 311                         /* 133 clock attempt to force it on */
 312                         pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
 313                         break;
 314                 case 0x10:
 315                         /* 133 already */
 316                         break;
 317                 case 0x20:
 318                         /* BIOS set PCI x2 clocking */
 319                         break;
 320         }
 321
 322         pci_read_config_byte(pdev,   0x8A, &tmpbyte);
 323         printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
 324                         tmpbyte & 1, tmpbyte & 0x30);
 325         if ((tmpbyte & 0x30) == 0)
 326                 port_info[0] = port_info[1] = &info_slow;
 327
 328         pci_write_config_byte(pdev,  0xA1, 0x72);
 329         pci_write_config_word(pdev,  0xA2, 0x328A);
 330         pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
 331         pci_write_config_dword(pdev, 0xA8, 0x43924392);
 332         pci_write_config_dword(pdev, 0xAC, 0x40094009);
 333         pci_write_config_byte(pdev,  0xB1, 0x72);
 334         pci_write_config_word(pdev,  0xB2, 0x328A);
 335         pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
 336         pci_write_config_dword(pdev, 0xB8, 0x43924392);
 337         pci_write_config_dword(pdev, 0xBC, 0x40094009);
 338
 339         switch(tmpbyte & 0x30) {
 340                 case 0x00: printk(KERN_INFO "sil680: 100MHz clock.\n");break;
 341                 case 0x10: printk(KERN_INFO "sil680: 133MHz clock.\n");break;
 342                 case 0x20: printk(KERN_INFO "sil680: Using PCI clock.\n");break;
 343                 /* This last case is _NOT_ ok */
 344                 case 0x30: printk(KERN_ERR "sil680: Clock disabled ?\n");
 345                         return -EIO;
 346         }
 347         return ata_pci_init_one(pdev, port_info, 2);
 348 }
 349
 350 static const struct pci_device_id sil680[] = {
 351         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
 352
 353         { },
 354 };
 355
 356 static struct pci_driver sil680_pci_driver = {
 357         .name           = DRV_NAME,
 358         .id_table       = sil680,
 359         .probe          = sil680_init_one,
 360         .remove         = ata_pci_remove_one
 361 };
 362
 363 static int __init sil680_init(void)
 364 {
 365         return pci_register_driver(&sil680_pci_driver);
 366 }
 367
 368 static void __exit sil680_exit(void)
 369 {
 370         pci_unregister_driver(&sil680_pci_driver);
 371 }
 372
 373 MODULE_AUTHOR("Alan Cox");
 374 MODULE_DESCRIPTION("low-level driver for SI680 PATA");
 375 MODULE_LICENSE("GPL");
 376 MODULE_DEVICE_TABLE(pci, sil680);
 377 MODULE_VERSION(DRV_VERSION);
 378
 379 module_init(sil680_init);
 380 module_exit(sil680_exit);