drivers/ata/pata_pdc202xx_old.c

   1 /*
   2  * pata_pdc202xx_old.c  - Promise PDC202xx PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *                        Alan Cox <alan@lxorguk.ukuu.org.uk>
   5  *                        (C) 2007,2009 Bartlomiej Zolnierkiewicz
   6  *
   7  * Based in part on linux/drivers/ide/pci/pdc202xx_old.c
   8  *
   9  * First cut with LBA48/ATAPI
  10  *
  11  * TODO:
  12  *      Channel interlock/reset on both required ?
  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 <scsi/scsi_host.h>
  22 #include <linux/libata.h>
  23
  24 #define DRV_NAME "pata_pdc202xx_old"
  25 #define DRV_VERSION "0.4.3"
  26
  27 static int pdc2026x_cable_detect(struct ata_port *ap)
  28 {
  29         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  30         u16 cis;
  31
  32         pci_read_config_word(pdev, 0x50, &cis);
  33         if (cis & (1 << (10 + ap->port_no)))
  34                 return ATA_CBL_PATA40;
  35         return ATA_CBL_PATA80;
  36 }
  37
  38 /**
  39  *      pdc202xx_configure_piomode      -       set chip PIO timing
  40  *      @ap: ATA interface
  41  *      @adev: ATA device
  42  *      @pio: PIO mode
  43  *
  44  *      Called to do the PIO mode setup. Our timing registers are shared
  45  *      so a configure_dmamode call will undo any work we do here and vice
  46  *      versa
  47  */
  48
  49 static void pdc202xx_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio)
  50 {
  51         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  52         int port = 0x60 + 8 * ap->port_no + 4 * adev->devno;
  53         static u16 pio_timing[5] = {
  54                 0x0913, 0x050C , 0x0308, 0x0206, 0x0104
  55         };
  56         u8 r_ap, r_bp;
  57
  58         pci_read_config_byte(pdev, port, &r_ap);
  59         pci_read_config_byte(pdev, port + 1, &r_bp);
  60         r_ap &= ~0x3F;  /* Preserve ERRDY_EN, SYNC_IN */
  61         r_bp &= ~0x1F;
  62         r_ap |= (pio_timing[pio] >> 8);
  63         r_bp |= (pio_timing[pio] & 0xFF);
  64
  65         if (ata_pio_need_iordy(adev))
  66                 r_ap |= 0x20;   /* IORDY enable */
  67         if (adev->class == ATA_DEV_ATA)
  68                 r_ap |= 0x10;   /* FIFO enable */
  69         pci_write_config_byte(pdev, port, r_ap);
  70         pci_write_config_byte(pdev, port + 1, r_bp);
  71 }
  72
  73 /**
  74  *      pdc202xx_set_piomode    -       set initial PIO mode data
  75  *      @ap: ATA interface
  76  *      @adev: ATA device
  77  *
  78  *      Called to do the PIO mode setup. Our timing registers are shared
  79  *      but we want to set the PIO timing by default.
  80  */
  81
  82 static void pdc202xx_set_piomode(struct ata_port *ap, struct ata_device *adev)
  83 {
  84         pdc202xx_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
  85 }
  86
  87 /**
  88  *      pdc202xx_configure_dmamode      -       set DMA mode in chip
  89  *      @ap: ATA interface
  90  *      @adev: ATA device
  91  *
  92  *      Load DMA cycle times into the chip ready for a DMA transfer
  93  *      to occur.
  94  */
  95
  96 static void pdc202xx_set_dmamode(struct ata_port *ap, struct ata_device *adev)
  97 {
  98         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  99         int port = 0x60 + 8 * ap->port_no + 4 * adev->devno;
 100         static u8 udma_timing[6][2] = {
 101                 { 0x60, 0x03 }, /* 33 Mhz Clock */
 102                 { 0x40, 0x02 },
 103                 { 0x20, 0x01 },
 104                 { 0x40, 0x02 }, /* 66 Mhz Clock */
 105                 { 0x20, 0x01 },
 106                 { 0x20, 0x01 }
 107         };
 108         static u8 mdma_timing[3][2] = {
 109                 { 0xe0, 0x0f },
 110                 { 0x60, 0x04 },
 111                 { 0x60, 0x03 },
 112         };
 113         u8 r_bp, r_cp;
 114
 115         pci_read_config_byte(pdev, port + 1, &r_bp);
 116         pci_read_config_byte(pdev, port + 2, &r_cp);
 117
 118         r_bp &= ~0xE0;
 119         r_cp &= ~0x0F;
 120
 121         if (adev->dma_mode >= XFER_UDMA_0) {
 122                 int speed = adev->dma_mode - XFER_UDMA_0;
 123                 r_bp |= udma_timing[speed][0];
 124                 r_cp |= udma_timing[speed][1];
 125
 126         } else {
 127                 int speed = adev->dma_mode - XFER_MW_DMA_0;
 128                 r_bp |= mdma_timing[speed][0];
 129                 r_cp |= mdma_timing[speed][1];
 130         }
 131         pci_write_config_byte(pdev, port + 1, r_bp);
 132         pci_write_config_byte(pdev, port + 2, r_cp);
 133
 134 }
 135
 136 /**
 137  *      pdc2026x_bmdma_start            -       DMA engine begin
 138  *      @qc: ATA command
 139  *
 140  *      In UDMA3 or higher we have to clock switch for the duration of the
 141  *      DMA transfer sequence.
 142  *
 143  *      Note: The host lock held by the libata layer protects
 144  *      us from two channels both trying to set DMA bits at once
 145  */
 146
 147 static void pdc2026x_bmdma_start(struct ata_queued_cmd *qc)
 148 {
 149         struct ata_port *ap = qc->ap;
 150         struct ata_device *adev = qc->dev;
 151         struct ata_taskfile *tf = &qc->tf;
 152         int sel66 = ap->port_no ? 0x08: 0x02;
 153
 154         void __iomem *master = ap->host->ports[0]->ioaddr.bmdma_addr;
 155         void __iomem *clock = master + 0x11;
 156         void __iomem *atapi_reg = master + 0x20 + (4 * ap->port_no);
 157
 158         u32 len;
 159
 160         /* Check we keep host level locking here */
 161         if (adev->dma_mode > XFER_UDMA_2)
 162                 iowrite8(ioread8(clock) | sel66, clock);
 163         else
 164                 iowrite8(ioread8(clock) & ~sel66, clock);
 165
 166         /* The DMA clocks may have been trashed by a reset. FIXME: make conditional
 167            and move to qc_issue ? */
 168         pdc202xx_set_dmamode(ap, qc->dev);
 169
 170         /* Cases the state machine will not complete correctly without help */
 171         if ((tf->flags & ATA_TFLAG_LBA48) ||  tf->protocol == ATAPI_PROT_DMA) {
 172                 len = qc->nbytes / 2;
 173
 174                 if (tf->flags & ATA_TFLAG_WRITE)
 175                         len |= 0x06000000;
 176                 else
 177                         len |= 0x05000000;
 178
 179                 iowrite32(len, atapi_reg);
 180         }
 181
 182         /* Activate DMA */
 183         ata_bmdma_start(qc);
 184 }
 185
 186 /**
 187  *      pdc2026x_bmdma_end              -       DMA engine stop
 188  *      @qc: ATA command
 189  *
 190  *      After a DMA completes we need to put the clock back to 33MHz for
 191  *      PIO timings.
 192  *
 193  *      Note: The host lock held by the libata layer protects
 194  *      us from two channels both trying to set DMA bits at once
 195  */
 196
 197 static void pdc2026x_bmdma_stop(struct ata_queued_cmd *qc)
 198 {
 199         struct ata_port *ap = qc->ap;
 200         struct ata_device *adev = qc->dev;
 201         struct ata_taskfile *tf = &qc->tf;
 202
 203         int sel66 = ap->port_no ? 0x08: 0x02;
 204         /* The clock bits are in the same register for both channels */
 205         void __iomem *master = ap->host->ports[0]->ioaddr.bmdma_addr;
 206         void __iomem *clock = master + 0x11;
 207         void __iomem *atapi_reg = master + 0x20 + (4 * ap->port_no);
 208
 209         /* Cases the state machine will not complete correctly */
 210         if (tf->protocol == ATAPI_PROT_DMA || (tf->flags & ATA_TFLAG_LBA48)) {
 211                 iowrite32(0, atapi_reg);
 212                 iowrite8(ioread8(clock) & ~sel66, clock);
 213         }
 214         /* Flip back to 33Mhz for PIO */
 215         if (adev->dma_mode > XFER_UDMA_2)
 216                 iowrite8(ioread8(clock) & ~sel66, clock);
 217         ata_bmdma_stop(qc);
 218         pdc202xx_set_piomode(ap, adev);
 219 }
 220
 221 /**
 222  *      pdc2026x_dev_config     -       device setup hook
 223  *      @adev: newly found device
 224  *
 225  *      Perform chip specific early setup. We need to lock the transfer
 226  *      sizes to 8bit to avoid making the state engine on the 2026x cards
 227  *      barf.
 228  */
 229
 230 static void pdc2026x_dev_config(struct ata_device *adev)
 231 {
 232         adev->max_sectors = 256;
 233 }
 234
 235 static int pdc2026x_port_start(struct ata_port *ap)
 236 {
 237         void __iomem *bmdma = ap->ioaddr.bmdma_addr;
 238         if (bmdma) {
 239                 /* Enable burst mode */
 240                 u8 burst = ioread8(bmdma + 0x1f);
 241                 iowrite8(burst | 0x01, bmdma + 0x1f);
 242         }
 243         return ata_sff_port_start(ap);
 244 }
 245
 246 /**
 247  *      pdc2026x_check_atapi_dma - Check whether ATAPI DMA can be supported for this command
 248  *      @qc: Metadata associated with taskfile to check
 249  *
 250  *      Just say no - not supported on older Promise.
 251  *
 252  *      LOCKING:
 253  *      None (inherited from caller).
 254  *
 255  *      RETURNS: 0 when ATAPI DMA can be used
 256  *               1 otherwise
 257  */
 258
 259 static int pdc2026x_check_atapi_dma(struct ata_queued_cmd *qc)
 260 {
 261         return 1;
 262 }
 263
 264 static struct scsi_host_template pdc202xx_sht = {
 265         ATA_BMDMA_SHT(DRV_NAME),
 266 };
 267
 268 static struct ata_port_operations pdc2024x_port_ops = {
 269         .inherits               = &ata_bmdma_port_ops,
 270
 271         .cable_detect           = ata_cable_40wire,
 272         .set_piomode            = pdc202xx_set_piomode,
 273         .set_dmamode            = pdc202xx_set_dmamode,
 274 };
 275
 276 static struct ata_port_operations pdc2026x_port_ops = {
 277         .inherits               = &pdc2024x_port_ops,
 278
 279         .check_atapi_dma        = pdc2026x_check_atapi_dma,
 280         .bmdma_start            = pdc2026x_bmdma_start,
 281         .bmdma_stop             = pdc2026x_bmdma_stop,
 282
 283         .cable_detect           = pdc2026x_cable_detect,
 284         .dev_config             = pdc2026x_dev_config,
 285
 286         .port_start             = pdc2026x_port_start,
 287 };
 288
 289 static int pdc202xx_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 290 {
 291         static const struct ata_port_info info[3] = {
 292                 {
 293                         .flags = ATA_FLAG_SLAVE_POSS,
 294                         .pio_mask = ATA_PIO4,
 295                         .mwdma_mask = ATA_MWDMA2,
 296                         .udma_mask = ATA_UDMA2,
 297                         .port_ops = &pdc2024x_port_ops
 298                 },
 299                 {
 300                         .flags = ATA_FLAG_SLAVE_POSS,
 301                         .pio_mask = ATA_PIO4,
 302                         .mwdma_mask = ATA_MWDMA2,
 303                         .udma_mask = ATA_UDMA4,
 304                         .port_ops = &pdc2026x_port_ops
 305                 },
 306                 {
 307                         .flags = ATA_FLAG_SLAVE_POSS,
 308                         .pio_mask = ATA_PIO4,
 309                         .mwdma_mask = ATA_MWDMA2,
 310                         .udma_mask = ATA_UDMA5,
 311                         .port_ops = &pdc2026x_port_ops
 312                 }
 313
 314         };
 315         const struct ata_port_info *ppi[] = { &info[id->driver_data], NULL };
 316
 317         if (dev->device == PCI_DEVICE_ID_PROMISE_20265) {
 318                 struct pci_dev *bridge = dev->bus->self;
 319                 /* Don't grab anything behind a Promise I2O RAID */
 320                 if (bridge && bridge->vendor == PCI_VENDOR_ID_INTEL) {
 321                         if (bridge->device == PCI_DEVICE_ID_INTEL_I960)
 322                                 return -ENODEV;
 323                         if (bridge->device == PCI_DEVICE_ID_INTEL_I960RM)
 324                                 return -ENODEV;
 325                 }
 326         }
 327         return ata_pci_sff_init_one(dev, ppi, &pdc202xx_sht, NULL);
 328 }
 329
 330 static const struct pci_device_id pdc202xx[] = {
 331         { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20246), 0 },
 332         { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20262), 1 },
 333         { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20263), 1 },
 334         { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20265), 2 },
 335         { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20267), 2 },
 336
 337         { },
 338 };
 339
 340 static struct pci_driver pdc202xx_pci_driver = {
 341         .name           = DRV_NAME,
 342         .id_table       = pdc202xx,
 343         .probe          = pdc202xx_init_one,
 344         .remove         = ata_pci_remove_one,
 345 #ifdef CONFIG_PM
 346         .suspend        = ata_pci_device_suspend,
 347         .resume         = ata_pci_device_resume,
 348 #endif
 349 };
 350
 351 static int __init pdc202xx_init(void)
 352 {
 353         return pci_register_driver(&pdc202xx_pci_driver);
 354 }
 355
 356 static void __exit pdc202xx_exit(void)
 357 {
 358         pci_unregister_driver(&pdc202xx_pci_driver);
 359 }
 360
 361 MODULE_AUTHOR("Alan Cox");
 362 MODULE_DESCRIPTION("low-level driver for Promise 2024x and 20262-20267");
 363 MODULE_LICENSE("GPL");
 364 MODULE_DEVICE_TABLE(pci, pdc202xx);
 365 MODULE_VERSION(DRV_VERSION);
 366
 367 module_init(pdc202xx_init);
 368 module_exit(pdc202xx_exit);