drivers/ata/pata_radisys.c

   1 /*
   2  *    pata_radisys.c - Intel PATA/SATA controllers
   3  *
   4  *      (C) 2006 Red Hat <alan@redhat.com>
   5  *
   6  *    Some parts based on ata_piix.c by Jeff Garzik and others.
   7  *
   8  *    A PIIX relative, this device has a single ATA channel and no
   9  *    slave timings, SITRE or PPE. In that sense it is a close relative
  10  *    of the original PIIX. It does however support UDMA 33/66 per channel
  11  *    although no other modes/timings. Also lacking is 32bit I/O on the ATA
  12  *    port.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18 #include <linux/init.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/delay.h>
  21 #include <linux/device.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/libata.h>
  24 #include <linux/ata.h>
  25
  26 #define DRV_NAME        "pata_radisys"
  27 #define DRV_VERSION     "0.4.1"
  28
  29 /**
  30  *      radisys_probe_init              -       probe begin
  31  *      @ap: ATA port
  32  *
  33  *      Set up cable type and use generic probe init
  34  */
  35
  36 static int radisys_pre_reset(struct ata_port *ap)
  37 {
  38         ap->cbl = ATA_CBL_PATA80;
  39         return ata_std_prereset(ap);
  40 }
  41
  42
  43 /**
  44  *      radisys_pata_error_handler - Probe specified port on PATA host controller
  45  *      @ap: Port to probe
  46  *      @classes:
  47  *
  48  *      LOCKING:
  49  *      None (inherited from caller).
  50  */
  51
  52 static void radisys_pata_error_handler(struct ata_port *ap)
  53 {
  54         ata_bmdma_drive_eh(ap, radisys_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
  55 }
  56
  57 /**
  58  *      radisys_set_piomode - Initialize host controller PATA PIO timings
  59  *      @ap: Port whose timings we are configuring
  60  *      @adev: um
  61  *
  62  *      Set PIO mode for device, in host controller PCI config space.
  63  *
  64  *      LOCKING:
  65  *      None (inherited from caller).
  66  */
  67
  68 static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev)
  69 {
  70         unsigned int pio        = adev->pio_mode - XFER_PIO_0;
  71         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
  72         u16 idetm_data;
  73         int control = 0;
  74
  75         /*
  76          *      See Intel Document 298600-004 for the timing programing rules
  77          *      for PIIX/ICH. Note that the early PIIX does not have the slave
  78          *      timing port at 0x44. The Radisys is a relative of the PIIX
  79          *      but not the same so be careful.
  80          */
  81
  82         static const     /* ISP  RTC */
  83         u8 timings[][2] = { { 0, 0 },   /* Check me */
  84                             { 0, 0 },
  85                             { 1, 1 },
  86                             { 2, 2 },
  87                             { 3, 3 }, };
  88
  89         if (pio > 0)
  90                 control |= 1;   /* TIME1 enable */
  91         if (ata_pio_need_iordy(adev))
  92                 control |= 2;   /* IE IORDY */
  93
  94         pci_read_config_word(dev, 0x40, &idetm_data);
  95
  96         /* Enable IE and TIME as appropriate. Clear the other
  97            drive timing bits */
  98         idetm_data &= 0xCCCC;
  99         idetm_data |= (control << (4 * adev->devno));
 100         idetm_data |= (timings[pio][0] << 12) |
 101                         (timings[pio][1] << 8);
 102         pci_write_config_word(dev, 0x40, idetm_data);
 103
 104         /* Track which port is configured */
 105         ap->private_data = adev;
 106 }
 107
 108 /**
 109  *      radisys_set_dmamode - Initialize host controller PATA DMA timings
 110  *      @ap: Port whose timings we are configuring
 111  *      @adev: Device to program
 112  *      @isich: True if the device is an ICH and has IOCFG registers
 113  *
 114  *      Set MWDMA mode for device, in host controller PCI config space.
 115  *
 116  *      LOCKING:
 117  *      None (inherited from caller).
 118  */
 119
 120 static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev)
 121 {
 122         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
 123         u16 idetm_data;
 124         u8 udma_enable;
 125
 126         static const     /* ISP  RTC */
 127         u8 timings[][2] = { { 0, 0 },
 128                             { 0, 0 },
 129                             { 1, 1 },
 130                             { 2, 2 },
 131                             { 3, 3 }, };
 132
 133         /*
 134          * MWDMA is driven by the PIO timings. We must also enable
 135          * IORDY unconditionally.
 136          */
 137
 138         pci_read_config_word(dev, 0x40, &idetm_data);
 139         pci_read_config_byte(dev, 0x48, &udma_enable);
 140
 141         if (adev->dma_mode < XFER_UDMA_0) {
 142                 unsigned int mwdma      = adev->dma_mode - XFER_MW_DMA_0;
 143                 const unsigned int needed_pio[3] = {
 144                         XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
 145                 };
 146                 int pio = needed_pio[mwdma] - XFER_PIO_0;
 147                 int control = 3;        /* IORDY|TIME0 */
 148
 149                 /* If the drive MWDMA is faster than it can do PIO then
 150                    we must force PIO0 for PIO cycles. */
 151
 152                 if (adev->pio_mode < needed_pio[mwdma])
 153                         control = 1;
 154
 155                 /* Mask out the relevant control and timing bits we will load. Also
 156                    clear the other drive TIME register as a precaution */
 157
 158                 idetm_data &= 0xCCCC;
 159                 idetm_data |= control << (4 * adev->devno);
 160                 idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
 161
 162                 udma_enable &= ~(1 << adev->devno);
 163         } else {
 164                 u8 udma_mode;
 165
 166                 /* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */
 167
 168                 pci_read_config_byte(dev, 0x4A, &udma_mode);
 169
 170                 if (adev->xfer_mode == XFER_UDMA_2)
 171                         udma_mode &= ~ (1 << adev->devno);
 172                 else /* UDMA 4 */
 173                         udma_mode |= (1 << adev->devno);
 174
 175                 pci_write_config_byte(dev, 0x4A, udma_mode);
 176
 177                 udma_enable |= (1 << adev->devno);
 178         }
 179         pci_write_config_word(dev, 0x40, idetm_data);
 180         pci_write_config_byte(dev, 0x48, udma_enable);
 181
 182         /* Track which port is configured */
 183         ap->private_data = adev;
 184 }
 185
 186 /**
 187  *      radisys_qc_issue_prot   -       command issue
 188  *      @qc: command pending
 189  *
 190  *      Called when the libata layer is about to issue a command. We wrap
 191  *      this interface so that we can load the correct ATA timings if
 192  *      neccessary. Our logic also clears TIME0/TIME1 for the other device so
 193  *      that, even if we get this wrong, cycles to the other device will
 194  *      be made PIO0.
 195  */
 196
 197 static unsigned int radisys_qc_issue_prot(struct ata_queued_cmd *qc)
 198 {
 199         struct ata_port *ap = qc->ap;
 200         struct ata_device *adev = qc->dev;
 201
 202         if (adev != ap->private_data) {
 203                 /* UDMA timing is not shared */
 204                 if (adev->dma_mode < XFER_UDMA_0) {
 205                         if (adev->dma_mode)
 206                                 radisys_set_dmamode(ap, adev);
 207                         else if (adev->pio_mode)
 208                                 radisys_set_piomode(ap, adev);
 209                 }
 210         }
 211         return ata_qc_issue_prot(qc);
 212 }
 213
 214
 215 static struct scsi_host_template radisys_sht = {
 216         .module                 = THIS_MODULE,
 217         .name                   = DRV_NAME,
 218         .ioctl                  = ata_scsi_ioctl,
 219         .queuecommand           = ata_scsi_queuecmd,
 220         .can_queue              = ATA_DEF_QUEUE,
 221         .this_id                = ATA_SHT_THIS_ID,
 222         .sg_tablesize           = LIBATA_MAX_PRD,
 223         .max_sectors            = ATA_MAX_SECTORS,
 224         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 225         .emulated               = ATA_SHT_EMULATED,
 226         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 227         .proc_name              = DRV_NAME,
 228         .dma_boundary           = ATA_DMA_BOUNDARY,
 229         .slave_configure        = ata_scsi_slave_config,
 230         .bios_param             = ata_std_bios_param,
 231 };
 232
 233 static const struct ata_port_operations radisys_pata_ops = {
 234         .port_disable           = ata_port_disable,
 235         .set_piomode            = radisys_set_piomode,
 236         .set_dmamode            = radisys_set_dmamode,
 237         .mode_filter            = ata_pci_default_filter,
 238
 239         .tf_load                = ata_tf_load,
 240         .tf_read                = ata_tf_read,
 241         .check_status           = ata_check_status,
 242         .exec_command           = ata_exec_command,
 243         .dev_select             = ata_std_dev_select,
 244
 245         .freeze                 = ata_bmdma_freeze,
 246         .thaw                   = ata_bmdma_thaw,
 247         .error_handler          = radisys_pata_error_handler,
 248         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 249
 250         .bmdma_setup            = ata_bmdma_setup,
 251         .bmdma_start            = ata_bmdma_start,
 252         .bmdma_stop             = ata_bmdma_stop,
 253         .bmdma_status           = ata_bmdma_status,
 254         .qc_prep                = ata_qc_prep,
 255         .qc_issue               = radisys_qc_issue_prot,
 256         .data_xfer              = ata_pio_data_xfer,
 257
 258         .irq_handler            = ata_interrupt,
 259         .irq_clear              = ata_bmdma_irq_clear,
 260
 261         .port_start             = ata_port_start,
 262         .port_stop              = ata_port_stop,
 263         .host_stop              = ata_host_stop,
 264 };
 265
 266
 267 /**
 268  *      radisys_init_one - Register PIIX ATA PCI device with kernel services
 269  *      @pdev: PCI device to register
 270  *      @ent: Entry in radisys_pci_tbl matching with @pdev
 271  *
 272  *      Called from kernel PCI layer.  We probe for combined mode (sigh),
 273  *      and then hand over control to libata, for it to do the rest.
 274  *
 275  *      LOCKING:
 276  *      Inherited from PCI layer (may sleep).
 277  *
 278  *      RETURNS:
 279  *      Zero on success, or -ERRNO value.
 280  */
 281
 282 static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 283 {
 284         static int printed_version;
 285         static struct ata_port_info info = {
 286                 .sht            = &radisys_sht,
 287                 .flags          = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 288                 .pio_mask       = 0x1f, /* pio0-4 */
 289                 .mwdma_mask     = 0x07, /* mwdma1-2 */
 290                 .udma_mask      = 0x14, /* UDMA33/66 only */
 291                 .port_ops       = &radisys_pata_ops,
 292         };
 293         static struct ata_port_info *port_info[2] = { &info, &info };
 294
 295         if (!printed_version++)
 296                 dev_printk(KERN_DEBUG, &pdev->dev,
 297                            "version " DRV_VERSION "\n");
 298
 299         return ata_pci_init_one(pdev, port_info, 2);
 300 }
 301
 302 static const struct pci_device_id radisys_pci_tbl[] = {
 303         { 0x1331, 0x8201, PCI_ANY_ID, PCI_ANY_ID, },
 304         { }     /* terminate list */
 305 };
 306
 307 static struct pci_driver radisys_pci_driver = {
 308         .name                   = DRV_NAME,
 309         .id_table               = radisys_pci_tbl,
 310         .probe                  = radisys_init_one,
 311         .remove                 = ata_pci_remove_one,
 312 };
 313
 314 static int __init radisys_init(void)
 315 {
 316         return pci_register_driver(&radisys_pci_driver);
 317 }
 318
 319 static void __exit radisys_exit(void)
 320 {
 321         pci_unregister_driver(&radisys_pci_driver);
 322 }
 323
 324
 325 module_init(radisys_init);
 326 module_exit(radisys_exit);
 327
 328 MODULE_AUTHOR("Alan Cox");
 329 MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers");
 330 MODULE_LICENSE("GPL");
 331 MODULE_DEVICE_TABLE(pci, radisys_pci_tbl);
 332 MODULE_VERSION(DRV_VERSION);
 333