drivers/ata/pata_it8213.c

   1 /*
   2  *    pata_it8213.c - iTE Tech. Inc.  IT8213 PATA driver
   3  *
   4  *    The IT8213 is a very Intel ICH like device for timing purposes, having
   5  *    a similar register layout and the same split clock arrangement. Cable
   6  *    detection is different, and it does not have slave channels or all the
   7  *    clutter of later ICH/SATA setups.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include <linux/init.h>
  14 #include <linux/blkdev.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <scsi/scsi_host.h>
  18 #include <linux/libata.h>
  19 #include <linux/ata.h>
  20
  21 #define DRV_NAME        "pata_it8213"
  22 #define DRV_VERSION     "0.0.3"
  23
  24 /**
  25  *      it8213_pre_reset        -       check for 40/80 pin
  26  *      @ap: Port
  27  *      @deadline: deadline jiffies for the operation
  28  *
  29  *      Filter out ports by the enable bits before doing the normal reset
  30  *      and probe.
  31  */
  32
  33 static int it8213_pre_reset(struct ata_port *ap, unsigned long deadline)
  34 {
  35         static const struct pci_bits it8213_enable_bits[] = {
  36                 { 0x41U, 1U, 0x80UL, 0x80UL },  /* port 0 */
  37         };
  38         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  39         if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no]))
  40                 return -ENOENT;
  41
  42         return ata_std_prereset(ap, deadline);
  43 }
  44
  45 /**
  46  *      it8213_error_handler - Probe specified port on PATA host controller
  47  *      @ap: Port to probe
  48  *
  49  *      LOCKING:
  50  *      None (inherited from caller).
  51  */
  52
  53 static void it8213_error_handler(struct ata_port *ap)
  54 {
  55         ata_bmdma_drive_eh(ap, it8213_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
  56 }
  57
  58 /**
  59  *      it8213_cable_detect     -       check for 40/80 pin
  60  *      @ap: Port
  61  *
  62  *      Perform cable detection for the 8213 ATA interface. This is
  63  *      different to the PIIX arrangement
  64  */
  65
  66 static int it8213_cable_detect(struct ata_port *ap)
  67 {
  68         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  69         u8 tmp;
  70         pci_read_config_byte(pdev, 0x42, &tmp);
  71         if (tmp & 2)    /* The initial docs are incorrect */
  72                 return ATA_CBL_PATA40;
  73         return ATA_CBL_PATA80;
  74 }
  75
  76 /**
  77  *      it8213_set_piomode - Initialize host controller PATA PIO timings
  78  *      @ap: Port whose timings we are configuring
  79  *      @adev: Device whose timings we are configuring
  80  *
  81  *      Set PIO mode for device, in host controller PCI config space.
  82  *
  83  *      LOCKING:
  84  *      None (inherited from caller).
  85  */
  86
  87 static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev)
  88 {
  89         unsigned int pio        = adev->pio_mode - XFER_PIO_0;
  90         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
  91         unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
  92         u16 idetm_data;
  93         int control = 0;
  94
  95         /*
  96          *      See Intel Document 298600-004 for the timing programing rules
  97          *      for PIIX/ICH. The 8213 is a clone so very similar
  98          */
  99
 100         static const     /* ISP  RTC */
 101         u8 timings[][2] = { { 0, 0 },
 102                             { 0, 0 },
 103                             { 1, 0 },
 104                             { 2, 1 },
 105                             { 2, 3 }, };
 106
 107         if (pio > 2)
 108                 control |= 1;   /* TIME1 enable */
 109         if (ata_pio_need_iordy(adev))   /* PIO 3/4 require IORDY */
 110                 control |= 2;   /* IORDY enable */
 111         /* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
 112         if (adev->class != ATA_DEV_ATA)
 113                 control |= 4;
 114
 115         pci_read_config_word(dev, idetm_port, &idetm_data);
 116
 117         /* Enable PPE, IE and TIME as appropriate */
 118
 119         if (adev->devno == 0) {
 120                 idetm_data &= 0xCCF0;
 121                 idetm_data |= control;
 122                 idetm_data |= (timings[pio][0] << 12) |
 123                         (timings[pio][1] << 8);
 124         } else {
 125                 u8 slave_data;
 126
 127                 idetm_data &= 0xCC0F;
 128                 idetm_data |= (control << 4);
 129
 130                 /* Slave timing in seperate register */
 131                 pci_read_config_byte(dev, 0x44, &slave_data);
 132                 slave_data &= 0xF0;
 133                 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << 4;
 134                 pci_write_config_byte(dev, 0x44, slave_data);
 135         }
 136
 137         idetm_data |= 0x4000;   /* Ensure SITRE is enabled */
 138         pci_write_config_word(dev, idetm_port, idetm_data);
 139 }
 140
 141 /**
 142  *      it8213_set_dmamode - Initialize host controller PATA DMA timings
 143  *      @ap: Port whose timings we are configuring
 144  *      @adev: Device to program
 145  *
 146  *      Set UDMA/MWDMA mode for device, in host controller PCI config space.
 147  *      This device is basically an ICH alike.
 148  *
 149  *      LOCKING:
 150  *      None (inherited from caller).
 151  */
 152
 153 static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev)
 154 {
 155         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
 156         u16 master_data;
 157         u8 speed                = adev->dma_mode;
 158         int devid               = adev->devno;
 159         u8 udma_enable;
 160
 161         static const     /* ISP  RTC */
 162         u8 timings[][2] = { { 0, 0 },
 163                             { 0, 0 },
 164                             { 1, 0 },
 165                             { 2, 1 },
 166                             { 2, 3 }, };
 167
 168         pci_read_config_word(dev, 0x40, &master_data);
 169         pci_read_config_byte(dev, 0x48, &udma_enable);
 170
 171         if (speed >= XFER_UDMA_0) {
 172                 unsigned int udma = adev->dma_mode - XFER_UDMA_0;
 173                 u16 udma_timing;
 174                 u16 ideconf;
 175                 int u_clock, u_speed;
 176
 177                 /* Clocks follow the PIIX style */
 178                 u_speed = min(2 - (udma & 1), udma);
 179                 if (udma == 5)
 180                         u_clock = 0x1000;       /* 100Mhz */
 181                 else if (udma > 2)
 182                         u_clock = 1;            /* 66Mhz */
 183                 else
 184                         u_clock = 0;            /* 33Mhz */
 185
 186                 udma_enable |= (1 << devid);
 187
 188                 /* Load the UDMA mode number */
 189                 pci_read_config_word(dev, 0x4A, &udma_timing);
 190                 udma_timing &= ~(3 << (4 * devid));
 191                 udma_timing |= (udma & 3) << (4 * devid);
 192                 pci_write_config_word(dev, 0x4A, udma_timing);
 193
 194                 /* Load the clock selection */
 195                 pci_read_config_word(dev, 0x54, &ideconf);
 196                 ideconf &= ~(0x1001 << devid);
 197                 ideconf |= u_clock << devid;
 198                 pci_write_config_word(dev, 0x54, ideconf);
 199         } else {
 200                 /*
 201                  * MWDMA is driven by the PIO timings. We must also enable
 202                  * IORDY unconditionally along with TIME1. PPE has already
 203                  * been set when the PIO timing was set.
 204                  */
 205                 unsigned int mwdma      = adev->dma_mode - XFER_MW_DMA_0;
 206                 unsigned int control;
 207                 u8 slave_data;
 208                 static const unsigned int needed_pio[3] = {
 209                         XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
 210                 };
 211                 int pio = needed_pio[mwdma] - XFER_PIO_0;
 212
 213                 control = 3;    /* IORDY|TIME1 */
 214
 215                 /* If the drive MWDMA is faster than it can do PIO then
 216                    we must force PIO into PIO0 */
 217
 218                 if (adev->pio_mode < needed_pio[mwdma])
 219                         /* Enable DMA timing only */
 220                         control |= 8;   /* PIO cycles in PIO0 */
 221
 222                 if (devid) {    /* Slave */
 223                         master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
 224                         master_data |= control << 4;
 225                         pci_read_config_byte(dev, 0x44, &slave_data);
 226                         slave_data &= (0x0F + 0xE1 * ap->port_no);
 227                         /* Load the matching timing */
 228                         slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
 229                         pci_write_config_byte(dev, 0x44, slave_data);
 230                 } else {        /* Master */
 231                         master_data &= 0xCCF4;  /* Mask out IORDY|TIME1|DMAONLY
 232                                                    and master timing bits */
 233                         master_data |= control;
 234                         master_data |=
 235                                 (timings[pio][0] << 12) |
 236                                 (timings[pio][1] << 8);
 237                 }
 238                 udma_enable &= ~(1 << devid);
 239                 pci_write_config_word(dev, 0x40, master_data);
 240         }
 241         pci_write_config_byte(dev, 0x48, udma_enable);
 242 }
 243
 244 static struct scsi_host_template it8213_sht = {
 245         .module                 = THIS_MODULE,
 246         .name                   = DRV_NAME,
 247         .ioctl                  = ata_scsi_ioctl,
 248         .queuecommand           = ata_scsi_queuecmd,
 249         .can_queue              = ATA_DEF_QUEUE,
 250         .this_id                = ATA_SHT_THIS_ID,
 251         .sg_tablesize           = LIBATA_MAX_PRD,
 252         .max_sectors            = ATA_MAX_SECTORS,
 253         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 254         .emulated               = ATA_SHT_EMULATED,
 255         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 256         .proc_name              = DRV_NAME,
 257         .dma_boundary           = ATA_DMA_BOUNDARY,
 258         .slave_configure        = ata_scsi_slave_config,
 259         .bios_param             = ata_std_bios_param,
 260 };
 261
 262 static const struct ata_port_operations it8213_ops = {
 263         .port_disable           = ata_port_disable,
 264         .set_piomode            = it8213_set_piomode,
 265         .set_dmamode            = it8213_set_dmamode,
 266         .mode_filter            = ata_pci_default_filter,
 267
 268         .tf_load                = ata_tf_load,
 269         .tf_read                = ata_tf_read,
 270         .check_status           = ata_check_status,
 271         .exec_command           = ata_exec_command,
 272         .dev_select             = ata_std_dev_select,
 273
 274         .freeze                 = ata_bmdma_freeze,
 275         .thaw                   = ata_bmdma_thaw,
 276         .error_handler          = it8213_error_handler,
 277         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 278         .cable_detect           = it8213_cable_detect,
 279
 280         .bmdma_setup            = ata_bmdma_setup,
 281         .bmdma_start            = ata_bmdma_start,
 282         .bmdma_stop             = ata_bmdma_stop,
 283         .bmdma_status           = ata_bmdma_status,
 284         .qc_prep                = ata_qc_prep,
 285         .qc_issue               = ata_qc_issue_prot,
 286         .data_xfer              = ata_data_xfer,
 287
 288         .irq_handler            = ata_interrupt,
 289         .irq_clear              = ata_bmdma_irq_clear,
 290         .irq_on                 = ata_irq_on,
 291         .irq_ack                = ata_irq_ack,
 292
 293         .port_start             = ata_port_start,
 294 };
 295
 296
 297 /**
 298  *      it8213_init_one - Register 8213 ATA PCI device with kernel services
 299  *      @pdev: PCI device to register
 300  *      @ent: Entry in it8213_pci_tbl matching with @pdev
 301  *
 302  *      Called from kernel PCI layer.
 303  *
 304  *      LOCKING:
 305  *      Inherited from PCI layer (may sleep).
 306  *
 307  *      RETURNS:
 308  *      Zero on success, or -ERRNO value.
 309  */
 310
 311 static int it8213_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 312 {
 313         static int printed_version;
 314         static const struct ata_port_info info = {
 315                 .sht            = &it8213_sht,
 316                 .flags          = ATA_FLAG_SLAVE_POSS,
 317                 .pio_mask       = 0x1f, /* pio0-4 */
 318                 .mwdma_mask     = 0x07, /* mwdma0-2 */
 319                 .udma_mask      = ATA_UDMA4, /* FIXME: want UDMA 100? */
 320                 .port_ops       = &it8213_ops,
 321         };
 322         /* Current IT8213 stuff is single port */
 323         const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
 324
 325         if (!printed_version++)
 326                 dev_printk(KERN_DEBUG, &pdev->dev,
 327                            "version " DRV_VERSION "\n");
 328
 329         return ata_pci_init_one(pdev, ppi);
 330 }
 331
 332 static const struct pci_device_id it8213_pci_tbl[] = {
 333         { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), },
 334
 335         { }     /* terminate list */
 336 };
 337
 338 static struct pci_driver it8213_pci_driver = {
 339         .name                   = DRV_NAME,
 340         .id_table               = it8213_pci_tbl,
 341         .probe                  = it8213_init_one,
 342         .remove                 = ata_pci_remove_one,
 343 #ifdef CONFIG_PM
 344         .suspend                = ata_pci_device_suspend,
 345         .resume                 = ata_pci_device_resume,
 346 #endif
 347 };
 348
 349 static int __init it8213_init(void)
 350 {
 351         return pci_register_driver(&it8213_pci_driver);
 352 }
 353
 354 static void __exit it8213_exit(void)
 355 {
 356         pci_unregister_driver(&it8213_pci_driver);
 357 }
 358
 359 module_init(it8213_init);
 360 module_exit(it8213_exit);
 361
 362 MODULE_AUTHOR("Alan Cox");
 363 MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213");
 364 MODULE_LICENSE("GPL");
 365 MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
 366 MODULE_VERSION(DRV_VERSION);