root/drivers/ata/pata_optidma.c

DEFINITIONS

1. optidma_pre_reset
2. optidma_unlock
3. optidma_lock
4. optidma_mode_setup
5. optiplus_mode_setup
6. optidma_set_pio_mode
7. optidma_set_dma_mode
8. optiplus_set_pio_mode
9. optiplus_set_dma_mode
10. optidma_make_bits43
11. optidma_set_mode
12. optiplus_with_udma
13. optidma_init_one

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * pata_optidma.c       - Opti DMA PATA for new ATA layer
   4  *                        (C) 2006 Red Hat Inc
   5  *
   6  *      The Opti DMA controllers are related to the older PIO PCI controllers
   7  *      and indeed the VLB ones. The main differences are that the timing
   8  *      numbers are now based off PCI clocks not VLB and differ, and that
   9  *      MWDMA is supported.
  10  *
  11  *      This driver should support Viper-N+, FireStar, FireStar Plus.
  12  *
  13  *      These devices support virtual DMA for read (aka the CS5520). Later
  14  *      chips support UDMA33, but only if the rest of the board logic does,
  15  *      so you have to get this right. We don't support the virtual DMA
  16  *      but we do handle UDMA.
  17  *
  18  *      Bits that are worth knowing
  19  *              Most control registers are shadowed into I/O registers
  20  *              0x1F5 bit 0 tells you if the PCI/VLB clock is 33 or 25Mhz
  21  *              Virtual DMA registers *move* between rev 0x02 and rev 0x10
  22  *              UDMA requires a 66MHz FSB
  23  *
  24  */
  25 
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/pci.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_optidma"
  35 #define DRV_VERSION "0.3.2"
  36 
  37 enum {
  38         READ_REG        = 0,    /* index of Read cycle timing register */
  39         WRITE_REG       = 1,    /* index of Write cycle timing register */
  40         CNTRL_REG       = 3,    /* index of Control register */
  41         STRAP_REG       = 5,    /* index of Strap register */
  42         MISC_REG        = 6     /* index of Miscellaneous register */
  43 };
  44 
  45 static int pci_clock;   /* 0 = 33 1 = 25 */
  46 
  47 /**
  48  *      optidma_pre_reset               -       probe begin
  49  *      @link: ATA link
  50  *      @deadline: deadline jiffies for the operation
  51  *
  52  *      Set up cable type and use generic probe init
  53  */
  54 
  55 static int optidma_pre_reset(struct ata_link *link, unsigned long deadline)
  56 {
  57         struct ata_port *ap = link->ap;
  58         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  59         static const struct pci_bits optidma_enable_bits = {
  60                 0x40, 1, 0x08, 0x00
  61         };
  62 
  63         if (ap->port_no && !pci_test_config_bits(pdev, &optidma_enable_bits))
  64                 return -ENOENT;
  65 
  66         return ata_sff_prereset(link, deadline);
  67 }
  68 
  69 /**
  70  *      optidma_unlock          -       unlock control registers
  71  *      @ap: ATA port
  72  *
  73  *      Unlock the control register block for this adapter. Registers must not
  74  *      be unlocked in a situation where libata might look at them.
  75  */
  76 
  77 static void optidma_unlock(struct ata_port *ap)
  78 {
  79         void __iomem *regio = ap->ioaddr.cmd_addr;
  80 
  81         /* These 3 unlock the control register access */
  82         ioread16(regio + 1);
  83         ioread16(regio + 1);
  84         iowrite8(3, regio + 2);
  85 }
  86 
  87 /**
  88  *      optidma_lock            -       issue temporary relock
  89  *      @ap: ATA port
  90  *
  91  *      Re-lock the configuration register settings.
  92  */
  93 
  94 static void optidma_lock(struct ata_port *ap)
  95 {
  96         void __iomem *regio = ap->ioaddr.cmd_addr;
  97 
  98         /* Relock */
  99         iowrite8(0x83, regio + 2);
 100 }
 101 
 102 /**
 103  *      optidma_mode_setup      -       set mode data
 104  *      @ap: ATA interface
 105  *      @adev: ATA device
 106  *      @mode: Mode to set
 107  *
 108  *      Called to do the DMA or PIO mode setup. Timing numbers are all
 109  *      pre computed to keep the code clean. There are two tables depending
 110  *      on the hardware clock speed.
 111  *
 112  *      WARNING: While we do this the IDE registers vanish. If we take an
 113  *      IRQ here we depend on the host set locking to avoid catastrophe.
 114  */
 115 
 116 static void optidma_mode_setup(struct ata_port *ap, struct ata_device *adev, u8 mode)
 117 {
 118         struct ata_device *pair = ata_dev_pair(adev);
 119         int pio = adev->pio_mode - XFER_PIO_0;
 120         int dma = adev->dma_mode - XFER_MW_DMA_0;
 121         void __iomem *regio = ap->ioaddr.cmd_addr;
 122         u8 addr;
 123 
 124         /* Address table precomputed with a DCLK of 2 */
 125         static const u8 addr_timing[2][5] = {
 126                 { 0x30, 0x20, 0x20, 0x10, 0x10 },
 127                 { 0x20, 0x20, 0x10, 0x10, 0x10 }
 128         };
 129         static const u8 data_rec_timing[2][5] = {
 130                 { 0x59, 0x46, 0x30, 0x20, 0x20 },
 131                 { 0x46, 0x32, 0x20, 0x20, 0x10 }
 132         };
 133         static const u8 dma_data_rec_timing[2][3] = {
 134                 { 0x76, 0x20, 0x20 },
 135                 { 0x54, 0x20, 0x10 }
 136         };
 137 
 138         /* Switch from IDE to control mode */
 139         optidma_unlock(ap);
 140 
 141 
 142         /*
 143          *      As with many controllers the address setup time is shared
 144          *      and must suit both devices if present. FIXME: Check if we
 145          *      need to look at slowest of PIO/DMA mode of either device
 146          */
 147 
 148         if (mode >= XFER_MW_DMA_0)
 149                 addr = 0;
 150         else
 151                 addr = addr_timing[pci_clock][pio];
 152 
 153         if (pair) {
 154                 u8 pair_addr;
 155                 /* Hardware constraint */
 156                 if (pair->dma_mode)
 157                         pair_addr = 0;
 158                 else
 159                         pair_addr = addr_timing[pci_clock][pair->pio_mode - XFER_PIO_0];
 160                 if (pair_addr > addr)
 161                         addr = pair_addr;
 162         }
 163 
 164         /* Commence primary programming sequence */
 165         /* First we load the device number into the timing select */
 166         iowrite8(adev->devno, regio + MISC_REG);
 167         /* Now we load the data timings into read data/write data */
 168         if (mode < XFER_MW_DMA_0) {
 169                 iowrite8(data_rec_timing[pci_clock][pio], regio + READ_REG);
 170                 iowrite8(data_rec_timing[pci_clock][pio], regio + WRITE_REG);
 171         } else if (mode < XFER_UDMA_0) {
 172                 iowrite8(dma_data_rec_timing[pci_clock][dma], regio + READ_REG);
 173                 iowrite8(dma_data_rec_timing[pci_clock][dma], regio + WRITE_REG);
 174         }
 175         /* Finally we load the address setup into the misc register */
 176         iowrite8(addr | adev->devno, regio + MISC_REG);
 177 
 178         /* Programming sequence complete, timing 0 dev 0, timing 1 dev 1 */
 179         iowrite8(0x85, regio + CNTRL_REG);
 180 
 181         /* Switch back to IDE mode */
 182         optidma_lock(ap);
 183 
 184         /* Note: at this point our programming is incomplete. We are
 185            not supposed to program PCI 0x43 "things we hacked onto the chip"
 186            until we've done both sets of PIO/DMA timings */
 187 }
 188 
 189 /**
 190  *      optiplus_mode_setup     -       DMA setup for Firestar Plus
 191  *      @ap: ATA port
 192  *      @adev: device
 193  *      @mode: desired mode
 194  *
 195  *      The Firestar plus has additional UDMA functionality for UDMA0-2 and
 196  *      requires we do some additional work. Because the base work we must do
 197  *      is mostly shared we wrap the Firestar setup functionality in this
 198  *      one
 199  */
 200 
 201 static void optiplus_mode_setup(struct ata_port *ap, struct ata_device *adev, u8 mode)
 202 {
 203         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 204         u8 udcfg;
 205         u8 udslave;
 206         int dev2 = 2 * adev->devno;
 207         int unit = 2 * ap->port_no + adev->devno;
 208         int udma = mode - XFER_UDMA_0;
 209 
 210         pci_read_config_byte(pdev, 0x44, &udcfg);
 211         if (mode <= XFER_UDMA_0) {
 212                 udcfg &= ~(1 << unit);
 213                 optidma_mode_setup(ap, adev, adev->dma_mode);
 214         } else {
 215                 udcfg |=  (1 << unit);
 216                 if (ap->port_no) {
 217                         pci_read_config_byte(pdev, 0x45, &udslave);
 218                         udslave &= ~(0x03 << dev2);
 219                         udslave |= (udma << dev2);
 220                         pci_write_config_byte(pdev, 0x45, udslave);
 221                 } else {
 222                         udcfg &= ~(0x30 << dev2);
 223                         udcfg |= (udma << dev2);
 224                 }
 225         }
 226         pci_write_config_byte(pdev, 0x44, udcfg);
 227 }
 228 
 229 /**
 230  *      optidma_set_pio_mode    -       PIO setup callback
 231  *      @ap: ATA port
 232  *      @adev: Device
 233  *
 234  *      The libata core provides separate functions for handling PIO and
 235  *      DMA programming. The architecture of the Firestar makes it easier
 236  *      for us to have a common function so we provide wrappers
 237  */
 238 
 239 static void optidma_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
 240 {
 241         optidma_mode_setup(ap, adev, adev->pio_mode);
 242 }
 243 
 244 /**
 245  *      optidma_set_dma_mode    -       DMA setup callback
 246  *      @ap: ATA port
 247  *      @adev: Device
 248  *
 249  *      The libata core provides separate functions for handling PIO and
 250  *      DMA programming. The architecture of the Firestar makes it easier
 251  *      for us to have a common function so we provide wrappers
 252  */
 253 
 254 static void optidma_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
 255 {
 256         optidma_mode_setup(ap, adev, adev->dma_mode);
 257 }
 258 
 259 /**
 260  *      optiplus_set_pio_mode   -       PIO setup callback
 261  *      @ap: ATA port
 262  *      @adev: Device
 263  *
 264  *      The libata core provides separate functions for handling PIO and
 265  *      DMA programming. The architecture of the Firestar makes it easier
 266  *      for us to have a common function so we provide wrappers
 267  */
 268 
 269 static void optiplus_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
 270 {
 271         optiplus_mode_setup(ap, adev, adev->pio_mode);
 272 }
 273 
 274 /**
 275  *      optiplus_set_dma_mode   -       DMA setup callback
 276  *      @ap: ATA port
 277  *      @adev: Device
 278  *
 279  *      The libata core provides separate functions for handling PIO and
 280  *      DMA programming. The architecture of the Firestar makes it easier
 281  *      for us to have a common function so we provide wrappers
 282  */
 283 
 284 static void optiplus_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
 285 {
 286         optiplus_mode_setup(ap, adev, adev->dma_mode);
 287 }
 288 
 289 /**
 290  *      optidma_make_bits       -       PCI setup helper
 291  *      @adev: ATA device
 292  *
 293  *      Turn the ATA device setup into PCI configuration bits
 294  *      for register 0x43 and return the two bits needed.
 295  */
 296 
 297 static u8 optidma_make_bits43(struct ata_device *adev)
 298 {
 299         static const u8 bits43[5] = {
 300                 0, 0, 0, 1, 2
 301         };
 302         if (!ata_dev_enabled(adev))
 303                 return 0;
 304         if (adev->dma_mode)
 305                 return adev->dma_mode - XFER_MW_DMA_0;
 306         return bits43[adev->pio_mode - XFER_PIO_0];
 307 }
 308 
 309 /**
 310  *      optidma_set_mode        -       mode setup
 311  *      @link: link to set up
 312  *
 313  *      Use the standard setup to tune the chipset and then finalise the
 314  *      configuration by writing the nibble of extra bits of data into
 315  *      the chip.
 316  */
 317 
 318 static int optidma_set_mode(struct ata_link *link, struct ata_device **r_failed)
 319 {
 320         struct ata_port *ap = link->ap;
 321         u8 r;
 322         int nybble = 4 * ap->port_no;
 323         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 324         int rc  = ata_do_set_mode(link, r_failed);
 325         if (rc == 0) {
 326                 pci_read_config_byte(pdev, 0x43, &r);
 327 
 328                 r &= (0x0F << nybble);
 329                 r |= (optidma_make_bits43(&link->device[0]) +
 330                      (optidma_make_bits43(&link->device[0]) << 2)) << nybble;
 331                 pci_write_config_byte(pdev, 0x43, r);
 332         }
 333         return rc;
 334 }
 335 
 336 static struct scsi_host_template optidma_sht = {
 337         ATA_BMDMA_SHT(DRV_NAME),
 338 };
 339 
 340 static struct ata_port_operations optidma_port_ops = {
 341         .inherits       = &ata_bmdma_port_ops,
 342         .cable_detect   = ata_cable_40wire,
 343         .set_piomode    = optidma_set_pio_mode,
 344         .set_dmamode    = optidma_set_dma_mode,
 345         .set_mode       = optidma_set_mode,
 346         .prereset       = optidma_pre_reset,
 347 };
 348 
 349 static struct ata_port_operations optiplus_port_ops = {
 350         .inherits       = &optidma_port_ops,
 351         .set_piomode    = optiplus_set_pio_mode,
 352         .set_dmamode    = optiplus_set_dma_mode,
 353 };
 354 
 355 /**
 356  *      optiplus_with_udma      -       Look for UDMA capable setup
 357  *      @pdev; ATA controller
 358  */
 359 
 360 static int optiplus_with_udma(struct pci_dev *pdev)
 361 {
 362         u8 r;
 363         int ret = 0;
 364         int ioport = 0x22;
 365         struct pci_dev *dev1;
 366 
 367         /* Find function 1 */
 368         dev1 = pci_get_device(0x1045, 0xC701, NULL);
 369         if (dev1 == NULL)
 370                 return 0;
 371 
 372         /* Rev must be >= 0x10 */
 373         pci_read_config_byte(dev1, 0x08, &r);
 374         if (r < 0x10)
 375                 goto done_nomsg;
 376         /* Read the chipset system configuration to check our mode */
 377         pci_read_config_byte(dev1, 0x5F, &r);
 378         ioport |= (r << 8);
 379         outb(0x10, ioport);
 380         /* Must be 66Mhz sync */
 381         if ((inb(ioport + 2) & 1) == 0)
 382                 goto done;
 383 
 384         /* Check the ATA arbitration/timing is suitable */
 385         pci_read_config_byte(pdev, 0x42, &r);
 386         if ((r & 0x36) != 0x36)
 387                 goto done;
 388         pci_read_config_byte(dev1, 0x52, &r);
 389         if (r & 0x80)   /* IDEDIR disabled */
 390                 ret = 1;
 391 done:
 392         printk(KERN_WARNING "UDMA not supported in this configuration.\n");
 393 done_nomsg:             /* Wrong chip revision */
 394         pci_dev_put(dev1);
 395         return ret;
 396 }
 397 
 398 static int optidma_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 399 {
 400         static const struct ata_port_info info_82c700 = {
 401                 .flags = ATA_FLAG_SLAVE_POSS,
 402                 .pio_mask = ATA_PIO4,
 403                 .mwdma_mask = ATA_MWDMA2,
 404                 .port_ops = &optidma_port_ops
 405         };
 406         static const struct ata_port_info info_82c700_udma = {
 407                 .flags = ATA_FLAG_SLAVE_POSS,
 408                 .pio_mask = ATA_PIO4,
 409                 .mwdma_mask = ATA_MWDMA2,
 410                 .udma_mask = ATA_UDMA2,
 411                 .port_ops = &optiplus_port_ops
 412         };
 413         const struct ata_port_info *ppi[] = { &info_82c700, NULL };
 414         int rc;
 415 
 416         ata_print_version_once(&dev->dev, DRV_VERSION);
 417 
 418         rc = pcim_enable_device(dev);
 419         if (rc)
 420                 return rc;
 421 
 422         /* Fixed location chipset magic */
 423         inw(0x1F1);
 424         inw(0x1F1);
 425         pci_clock = inb(0x1F5) & 1;             /* 0 = 33Mhz, 1 = 25Mhz */
 426 
 427         if (optiplus_with_udma(dev))
 428                 ppi[0] = &info_82c700_udma;
 429 
 430         return ata_pci_bmdma_init_one(dev, ppi, &optidma_sht, NULL, 0);
 431 }
 432 
 433 static const struct pci_device_id optidma[] = {
 434         { PCI_VDEVICE(OPTI, 0xD568), },         /* Opti 82C700 */
 435 
 436         { },
 437 };
 438 
 439 static struct pci_driver optidma_pci_driver = {
 440         .name           = DRV_NAME,
 441         .id_table       = optidma,
 442         .probe          = optidma_init_one,
 443         .remove         = ata_pci_remove_one,
 444 #ifdef CONFIG_PM_SLEEP
 445         .suspend        = ata_pci_device_suspend,
 446         .resume         = ata_pci_device_resume,
 447 #endif
 448 };
 449 
 450 module_pci_driver(optidma_pci_driver);
 451 
 452 MODULE_AUTHOR("Alan Cox");
 453 MODULE_DESCRIPTION("low-level driver for Opti Firestar/Firestar Plus");
 454 MODULE_LICENSE("GPL");
 455 MODULE_DEVICE_TABLE(pci, optidma);
 456 MODULE_VERSION(DRV_VERSION);