linux/drivers/ata/pata_pdc2027x.c
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   1/*
   2 *  Promise PATA TX2/TX4/TX2000/133 IDE driver for pdc20268 to pdc20277.
   3 *
   4 *  This program is free software; you can redistribute it and/or
   5 *  modify it under the terms of the GNU General Public License
   6 *  as published by the Free Software Foundation; either version
   7 *  2 of the License, or (at your option) any later version.
   8 *
   9 *  Ported to libata by:
  10 *  Albert Lee <albertcc@tw.ibm.com> IBM Corporation
  11 *
  12 *  Copyright (C) 1998-2002             Andre Hedrick <andre@linux-ide.org>
  13 *  Portions Copyright (C) 1999 Promise Technology, Inc.
  14 *
  15 *  Author: Frank Tiernan (frankt@promise.com)
  16 *  Released under terms of General Public License
  17 *
  18 *
  19 *  libata documentation is available via 'make {ps|pdf}docs',
  20 *  as Documentation/DocBook/libata.*
  21 *
  22 *  Hardware information only available under NDA.
  23 *
  24 */
  25#include <linux/kernel.h>
  26#include <linux/module.h>
  27#include <linux/pci.h>
  28#include <linux/init.h>
  29#include <linux/blkdev.h>
  30#include <linux/delay.h>
  31#include <linux/device.h>
  32#include <scsi/scsi.h>
  33#include <scsi/scsi_host.h>
  34#include <scsi/scsi_cmnd.h>
  35#include <linux/libata.h>
  36
  37#define DRV_NAME        "pata_pdc2027x"
  38#define DRV_VERSION     "1.0"
  39#undef PDC_DEBUG
  40
  41#ifdef PDC_DEBUG
  42#define PDPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
  43#else
  44#define PDPRINTK(fmt, args...)
  45#endif
  46
  47enum {
  48        PDC_MMIO_BAR            = 5,
  49
  50        PDC_UDMA_100            = 0,
  51        PDC_UDMA_133            = 1,
  52
  53        PDC_100_MHZ             = 100000000,
  54        PDC_133_MHZ             = 133333333,
  55
  56        PDC_SYS_CTL             = 0x1100,
  57        PDC_ATA_CTL             = 0x1104,
  58        PDC_GLOBAL_CTL          = 0x1108,
  59        PDC_CTCR0               = 0x110C,
  60        PDC_CTCR1               = 0x1110,
  61        PDC_BYTE_COUNT          = 0x1120,
  62        PDC_PLL_CTL             = 0x1202,
  63};
  64
  65static int pdc2027x_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
  66static int pdc2027x_prereset(struct ata_link *link, unsigned long deadline);
  67static void pdc2027x_set_piomode(struct ata_port *ap, struct ata_device *adev);
  68static void pdc2027x_set_dmamode(struct ata_port *ap, struct ata_device *adev);
  69static int pdc2027x_check_atapi_dma(struct ata_queued_cmd *qc);
  70static unsigned long pdc2027x_mode_filter(struct ata_device *adev, unsigned long mask);
  71static int pdc2027x_cable_detect(struct ata_port *ap);
  72static int pdc2027x_set_mode(struct ata_link *link, struct ata_device **r_failed);
  73
  74/*
  75 * ATA Timing Tables based on 133MHz controller clock.
  76 * These tables are only used when the controller is in 133MHz clock.
  77 * If the controller is in 100MHz clock, the ASIC hardware will
  78 * set the timing registers automatically when "set feature" command
  79 * is issued to the device. However, if the controller clock is 133MHz,
  80 * the following tables must be used.
  81 */
  82static struct pdc2027x_pio_timing {
  83        u8 value0, value1, value2;
  84} pdc2027x_pio_timing_tbl [] = {
  85        { 0xfb, 0x2b, 0xac }, /* PIO mode 0 */
  86        { 0x46, 0x29, 0xa4 }, /* PIO mode 1 */
  87        { 0x23, 0x26, 0x64 }, /* PIO mode 2 */
  88        { 0x27, 0x0d, 0x35 }, /* PIO mode 3, IORDY on, Prefetch off */
  89        { 0x23, 0x09, 0x25 }, /* PIO mode 4, IORDY on, Prefetch off */
  90};
  91
  92static struct pdc2027x_mdma_timing {
  93        u8 value0, value1;
  94} pdc2027x_mdma_timing_tbl [] = {
  95        { 0xdf, 0x5f }, /* MDMA mode 0 */
  96        { 0x6b, 0x27 }, /* MDMA mode 1 */
  97        { 0x69, 0x25 }, /* MDMA mode 2 */
  98};
  99
 100static struct pdc2027x_udma_timing {
 101        u8 value0, value1, value2;
 102} pdc2027x_udma_timing_tbl [] = {
 103        { 0x4a, 0x0f, 0xd5 }, /* UDMA mode 0 */
 104        { 0x3a, 0x0a, 0xd0 }, /* UDMA mode 1 */
 105        { 0x2a, 0x07, 0xcd }, /* UDMA mode 2 */
 106        { 0x1a, 0x05, 0xcd }, /* UDMA mode 3 */
 107        { 0x1a, 0x03, 0xcd }, /* UDMA mode 4 */
 108        { 0x1a, 0x02, 0xcb }, /* UDMA mode 5 */
 109        { 0x1a, 0x01, 0xcb }, /* UDMA mode 6 */
 110};
 111
 112static const struct pci_device_id pdc2027x_pci_tbl[] = {
 113        { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20268), PDC_UDMA_100 },
 114        { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20269), PDC_UDMA_133 },
 115        { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20270), PDC_UDMA_100 },
 116        { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20271), PDC_UDMA_133 },
 117        { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20275), PDC_UDMA_133 },
 118        { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20276), PDC_UDMA_133 },
 119        { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20277), PDC_UDMA_133 },
 120
 121        { }     /* terminate list */
 122};
 123
 124static struct pci_driver pdc2027x_pci_driver = {
 125        .name                   = DRV_NAME,
 126        .id_table               = pdc2027x_pci_tbl,
 127        .probe                  = pdc2027x_init_one,
 128        .remove                 = ata_pci_remove_one,
 129};
 130
 131static struct scsi_host_template pdc2027x_sht = {
 132        ATA_BMDMA_SHT(DRV_NAME),
 133};
 134
 135static struct ata_port_operations pdc2027x_pata100_ops = {
 136        .inherits               = &ata_bmdma_port_ops,
 137        .check_atapi_dma        = pdc2027x_check_atapi_dma,
 138        .cable_detect           = pdc2027x_cable_detect,
 139        .prereset               = pdc2027x_prereset,
 140};
 141
 142static struct ata_port_operations pdc2027x_pata133_ops = {
 143        .inherits               = &pdc2027x_pata100_ops,
 144        .mode_filter            = pdc2027x_mode_filter,
 145        .set_piomode            = pdc2027x_set_piomode,
 146        .set_dmamode            = pdc2027x_set_dmamode,
 147        .set_mode               = pdc2027x_set_mode,
 148};
 149
 150static struct ata_port_info pdc2027x_port_info[] = {
 151        /* PDC_UDMA_100 */
 152        {
 153                .flags          = ATA_FLAG_NO_LEGACY | ATA_FLAG_SLAVE_POSS |
 154                                  ATA_FLAG_MMIO,
 155                .pio_mask       = 0x1f, /* pio0-4 */
 156                .mwdma_mask     = 0x07, /* mwdma0-2 */
 157                .udma_mask      = ATA_UDMA5, /* udma0-5 */
 158                .port_ops       = &pdc2027x_pata100_ops,
 159        },
 160        /* PDC_UDMA_133 */
 161        {
 162                .flags          = ATA_FLAG_NO_LEGACY | ATA_FLAG_SLAVE_POSS |
 163                                  ATA_FLAG_MMIO,
 164                .pio_mask       = 0x1f, /* pio0-4 */
 165                .mwdma_mask     = 0x07, /* mwdma0-2 */
 166                .udma_mask      = ATA_UDMA6, /* udma0-6 */
 167                .port_ops       = &pdc2027x_pata133_ops,
 168        },
 169};
 170
 171MODULE_AUTHOR("Andre Hedrick, Frank Tiernan, Albert Lee");
 172MODULE_DESCRIPTION("libata driver module for Promise PDC20268 to PDC20277");
 173MODULE_LICENSE("GPL");
 174MODULE_VERSION(DRV_VERSION);
 175MODULE_DEVICE_TABLE(pci, pdc2027x_pci_tbl);
 176
 177/**
 178 *      port_mmio - Get the MMIO address of PDC2027x extended registers
 179 *      @ap: Port
 180 *      @offset: offset from mmio base
 181 */
 182static inline void __iomem *port_mmio(struct ata_port *ap, unsigned int offset)
 183{
 184        return ap->host->iomap[PDC_MMIO_BAR] + ap->port_no * 0x100 + offset;
 185}
 186
 187/**
 188 *      dev_mmio - Get the MMIO address of PDC2027x extended registers
 189 *      @ap: Port
 190 *      @adev: device
 191 *      @offset: offset from mmio base
 192 */
 193static inline void __iomem *dev_mmio(struct ata_port *ap, struct ata_device *adev, unsigned int offset)
 194{
 195        u8 adj = (adev->devno) ? 0x08 : 0x00;
 196        return port_mmio(ap, offset) + adj;
 197}
 198
 199/**
 200 *      pdc2027x_pata_cable_detect - Probe host controller cable detect info
 201 *      @ap: Port for which cable detect info is desired
 202 *
 203 *      Read 80c cable indicator from Promise extended register.
 204 *      This register is latched when the system is reset.
 205 *
 206 *      LOCKING:
 207 *      None (inherited from caller).
 208 */
 209static int pdc2027x_cable_detect(struct ata_port *ap)
 210{
 211        u32 cgcr;
 212
 213        /* check cable detect results */
 214        cgcr = ioread32(port_mmio(ap, PDC_GLOBAL_CTL));
 215        if (cgcr & (1 << 26))
 216                goto cbl40;
 217
 218        PDPRINTK("No cable or 80-conductor cable on port %d\n", ap->port_no);
 219
 220        return ATA_CBL_PATA80;
 221cbl40:
 222        printk(KERN_INFO DRV_NAME ": 40-conductor cable detected on port %d\n", ap->port_no);
 223        return ATA_CBL_PATA40;
 224}
 225
 226/**
 227 * pdc2027x_port_enabled - Check PDC ATA control register to see whether the port is enabled.
 228 * @ap: Port to check
 229 */
 230static inline int pdc2027x_port_enabled(struct ata_port *ap)
 231{
 232        return ioread8(port_mmio(ap, PDC_ATA_CTL)) & 0x02;
 233}
 234
 235/**
 236 *      pdc2027x_prereset - prereset for PATA host controller
 237 *      @link: Target link
 238 *      @deadline: deadline jiffies for the operation
 239 *
 240 *      Probeinit including cable detection.
 241 *
 242 *      LOCKING:
 243 *      None (inherited from caller).
 244 */
 245
 246static int pdc2027x_prereset(struct ata_link *link, unsigned long deadline)
 247{
 248        /* Check whether port enabled */
 249        if (!pdc2027x_port_enabled(link->ap))
 250                return -ENOENT;
 251        return ata_sff_prereset(link, deadline);
 252}
 253
 254/**
 255 *      pdc2720x_mode_filter    -       mode selection filter
 256 *      @adev: ATA device
 257 *      @mask: list of modes proposed
 258 *
 259 *      Block UDMA on devices that cause trouble with this controller.
 260 */
 261
 262static unsigned long pdc2027x_mode_filter(struct ata_device *adev, unsigned long mask)
 263{
 264        unsigned char model_num[ATA_ID_PROD_LEN + 1];
 265        struct ata_device *pair = ata_dev_pair(adev);
 266
 267        if (adev->class != ATA_DEV_ATA || adev->devno == 0 || pair == NULL)
 268                return ata_bmdma_mode_filter(adev, mask);
 269
 270        /* Check for slave of a Maxtor at UDMA6 */
 271        ata_id_c_string(pair->id, model_num, ATA_ID_PROD,
 272                          ATA_ID_PROD_LEN + 1);
 273        /* If the master is a maxtor in UDMA6 then the slave should not use UDMA 6 */
 274        if (strstr(model_num, "Maxtor") == NULL && pair->dma_mode == XFER_UDMA_6)
 275                mask &= ~ (1 << (6 + ATA_SHIFT_UDMA));
 276
 277        return ata_bmdma_mode_filter(adev, mask);
 278}
 279
 280/**
 281 *      pdc2027x_set_piomode - Initialize host controller PATA PIO timings
 282 *      @ap: Port to configure
 283 *      @adev: um
 284 *      @pio: PIO mode, 0 - 4
 285 *
 286 *      Set PIO mode for device.
 287 *
 288 *      LOCKING:
 289 *      None (inherited from caller).
 290 */
 291
 292static void pdc2027x_set_piomode(struct ata_port *ap, struct ata_device *adev)
 293{
 294        unsigned int pio = adev->pio_mode - XFER_PIO_0;
 295        u32 ctcr0, ctcr1;
 296
 297        PDPRINTK("adev->pio_mode[%X]\n", adev->pio_mode);
 298
 299        /* Sanity check */
 300        if (pio > 4) {
 301                printk(KERN_ERR DRV_NAME ": Unknown pio mode [%d] ignored\n", pio);
 302                return;
 303
 304        }
 305
 306        /* Set the PIO timing registers using value table for 133MHz */
 307        PDPRINTK("Set pio regs... \n");
 308
 309        ctcr0 = ioread32(dev_mmio(ap, adev, PDC_CTCR0));
 310        ctcr0 &= 0xffff0000;
 311        ctcr0 |= pdc2027x_pio_timing_tbl[pio].value0 |
 312                (pdc2027x_pio_timing_tbl[pio].value1 << 8);
 313        iowrite32(ctcr0, dev_mmio(ap, adev, PDC_CTCR0));
 314
 315        ctcr1 = ioread32(dev_mmio(ap, adev, PDC_CTCR1));
 316        ctcr1 &= 0x00ffffff;
 317        ctcr1 |= (pdc2027x_pio_timing_tbl[pio].value2 << 24);
 318        iowrite32(ctcr1, dev_mmio(ap, adev, PDC_CTCR1));
 319
 320        PDPRINTK("Set pio regs done\n");
 321
 322        PDPRINTK("Set to pio mode[%u] \n", pio);
 323}
 324
 325/**
 326 *      pdc2027x_set_dmamode - Initialize host controller PATA UDMA timings
 327 *      @ap: Port to configure
 328 *      @adev: um
 329 *      @udma: udma mode, XFER_UDMA_0 to XFER_UDMA_6
 330 *
 331 *      Set UDMA mode for device.
 332 *
 333 *      LOCKING:
 334 *      None (inherited from caller).
 335 */
 336static void pdc2027x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 337{
 338        unsigned int dma_mode = adev->dma_mode;
 339        u32 ctcr0, ctcr1;
 340
 341        if ((dma_mode >= XFER_UDMA_0) &&
 342           (dma_mode <= XFER_UDMA_6)) {
 343                /* Set the UDMA timing registers with value table for 133MHz */
 344                unsigned int udma_mode = dma_mode & 0x07;
 345
 346                if (dma_mode == XFER_UDMA_2) {
 347                        /*
 348                         * Turn off tHOLD.
 349                         * If tHOLD is '1', the hardware will add half clock for data hold time.
 350                         * This code segment seems to be no effect. tHOLD will be overwritten below.
 351                         */
 352                        ctcr1 = ioread32(dev_mmio(ap, adev, PDC_CTCR1));
 353                        iowrite32(ctcr1 & ~(1 << 7), dev_mmio(ap, adev, PDC_CTCR1));
 354                }
 355
 356                PDPRINTK("Set udma regs... \n");
 357
 358                ctcr1 = ioread32(dev_mmio(ap, adev, PDC_CTCR1));
 359                ctcr1 &= 0xff000000;
 360                ctcr1 |= pdc2027x_udma_timing_tbl[udma_mode].value0 |
 361                        (pdc2027x_udma_timing_tbl[udma_mode].value1 << 8) |
 362                        (pdc2027x_udma_timing_tbl[udma_mode].value2 << 16);
 363                iowrite32(ctcr1, dev_mmio(ap, adev, PDC_CTCR1));
 364
 365                PDPRINTK("Set udma regs done\n");
 366
 367                PDPRINTK("Set to udma mode[%u] \n", udma_mode);
 368
 369        } else  if ((dma_mode >= XFER_MW_DMA_0) &&
 370                   (dma_mode <= XFER_MW_DMA_2)) {
 371                /* Set the MDMA timing registers with value table for 133MHz */
 372                unsigned int mdma_mode = dma_mode & 0x07;
 373
 374                PDPRINTK("Set mdma regs... \n");
 375                ctcr0 = ioread32(dev_mmio(ap, adev, PDC_CTCR0));
 376
 377                ctcr0 &= 0x0000ffff;
 378                ctcr0 |= (pdc2027x_mdma_timing_tbl[mdma_mode].value0 << 16) |
 379                        (pdc2027x_mdma_timing_tbl[mdma_mode].value1 << 24);
 380
 381                iowrite32(ctcr0, dev_mmio(ap, adev, PDC_CTCR0));
 382                PDPRINTK("Set mdma regs done\n");
 383
 384                PDPRINTK("Set to mdma mode[%u] \n", mdma_mode);
 385        } else {
 386                printk(KERN_ERR DRV_NAME ": Unknown dma mode [%u] ignored\n", dma_mode);
 387        }
 388}
 389
 390/**
 391 *      pdc2027x_set_mode - Set the timing registers back to correct values.
 392 *      @link: link to configure
 393 *      @r_failed: Returned device for failure
 394 *
 395 *      The pdc2027x hardware will look at "SET FEATURES" and change the timing registers
 396 *      automatically. The values set by the hardware might be incorrect, under 133Mhz PLL.
 397 *      This function overwrites the possibly incorrect values set by the hardware to be correct.
 398 */
 399static int pdc2027x_set_mode(struct ata_link *link, struct ata_device **r_failed)
 400{
 401        struct ata_port *ap = link->ap;
 402        struct ata_device *dev;
 403        int rc;
 404
 405        rc = ata_do_set_mode(link, r_failed);
 406        if (rc < 0)
 407                return rc;
 408
 409        ata_link_for_each_dev(dev, link) {
 410                if (ata_dev_enabled(dev)) {
 411
 412                        pdc2027x_set_piomode(ap, dev);
 413
 414                        /*
 415                         * Enable prefetch if the device support PIO only.
 416                         */
 417                        if (dev->xfer_shift == ATA_SHIFT_PIO) {
 418                                u32 ctcr1 = ioread32(dev_mmio(ap, dev, PDC_CTCR1));
 419                                ctcr1 |= (1 << 25);
 420                                iowrite32(ctcr1, dev_mmio(ap, dev, PDC_CTCR1));
 421
 422                                PDPRINTK("Turn on prefetch\n");
 423                        } else {
 424                                pdc2027x_set_dmamode(ap, dev);
 425                        }
 426                }
 427        }
 428        return 0;
 429}
 430
 431/**
 432 *      pdc2027x_check_atapi_dma - Check whether ATAPI DMA can be supported for this command
 433 *      @qc: Metadata associated with taskfile to check
 434 *
 435 *      LOCKING:
 436 *      None (inherited from caller).
 437 *
 438 *      RETURNS: 0 when ATAPI DMA can be used
 439 *               1 otherwise
 440 */
 441static int pdc2027x_check_atapi_dma(struct ata_queued_cmd *qc)
 442{
 443        struct scsi_cmnd *cmd = qc->scsicmd;
 444        u8 *scsicmd = cmd->cmnd;
 445        int rc = 1; /* atapi dma off by default */
 446
 447        /*
 448         * This workaround is from Promise's GPL driver.
 449         * If ATAPI DMA is used for commands not in the
 450         * following white list, say MODE_SENSE and REQUEST_SENSE,
 451         * pdc2027x might hit the irq lost problem.
 452         */
 453        switch (scsicmd[0]) {
 454        case READ_10:
 455        case WRITE_10:
 456        case READ_12:
 457        case WRITE_12:
 458        case READ_6:
 459        case WRITE_6:
 460        case 0xad: /* READ_DVD_STRUCTURE */
 461        case 0xbe: /* READ_CD */
 462                /* ATAPI DMA is ok */
 463                rc = 0;
 464                break;
 465        default:
 466                ;
 467        }
 468
 469        return rc;
 470}
 471
 472/**
 473 * pdc_read_counter - Read the ctr counter
 474 * @host: target ATA host
 475 */
 476
 477static long pdc_read_counter(struct ata_host *host)
 478{
 479        void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
 480        long counter;
 481        int retry = 1;
 482        u32 bccrl, bccrh, bccrlv, bccrhv;
 483
 484retry:
 485        bccrl = ioread32(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
 486        bccrh = ioread32(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
 487
 488        /* Read the counter values again for verification */
 489        bccrlv = ioread32(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
 490        bccrhv = ioread32(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
 491
 492        counter = (bccrh << 15) | bccrl;
 493
 494        PDPRINTK("bccrh [%X] bccrl [%X]\n", bccrh,  bccrl);
 495        PDPRINTK("bccrhv[%X] bccrlv[%X]\n", bccrhv, bccrlv);
 496
 497        /*
 498         * The 30-bit decreasing counter are read by 2 pieces.
 499         * Incorrect value may be read when both bccrh and bccrl are changing.
 500         * Ex. When 7900 decrease to 78FF, wrong value 7800 might be read.
 501         */
 502        if (retry && !(bccrh == bccrhv && bccrl >= bccrlv)) {
 503                retry--;
 504                PDPRINTK("rereading counter\n");
 505                goto retry;
 506        }
 507
 508        return counter;
 509}
 510
 511/**
 512 * adjust_pll - Adjust the PLL input clock in Hz.
 513 *
 514 * @pdc_controller: controller specific information
 515 * @host: target ATA host
 516 * @pll_clock: The input of PLL in HZ
 517 */
 518static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int board_idx)
 519{
 520        void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
 521        u16 pll_ctl;
 522        long pll_clock_khz = pll_clock / 1000;
 523        long pout_required = board_idx? PDC_133_MHZ:PDC_100_MHZ;
 524        long ratio = pout_required / pll_clock_khz;
 525        int F, R;
 526
 527        /* Sanity check */
 528        if (unlikely(pll_clock_khz < 5000L || pll_clock_khz > 70000L)) {
 529                printk(KERN_ERR DRV_NAME ": Invalid PLL input clock %ldkHz, give up!\n", pll_clock_khz);
 530                return;
 531        }
 532
 533#ifdef PDC_DEBUG
 534        PDPRINTK("pout_required is %ld\n", pout_required);
 535
 536        /* Show the current clock value of PLL control register
 537         * (maybe already configured by the firmware)
 538         */
 539        pll_ctl = ioread16(mmio_base + PDC_PLL_CTL);
 540
 541        PDPRINTK("pll_ctl[%X]\n", pll_ctl);
 542#endif
 543
 544        /*
 545         * Calculate the ratio of F, R and OD
 546         * POUT = (F + 2) / (( R + 2) * NO)
 547         */
 548        if (ratio < 8600L) { /* 8.6x */
 549                /* Using NO = 0x01, R = 0x0D */
 550                R = 0x0d;
 551        } else if (ratio < 12900L) { /* 12.9x */
 552                /* Using NO = 0x01, R = 0x08 */
 553                R = 0x08;
 554        } else if (ratio < 16100L) { /* 16.1x */
 555                /* Using NO = 0x01, R = 0x06 */
 556                R = 0x06;
 557        } else if (ratio < 64000L) { /* 64x */
 558                R = 0x00;
 559        } else {
 560                /* Invalid ratio */
 561                printk(KERN_ERR DRV_NAME ": Invalid ratio %ld, give up!\n", ratio);
 562                return;
 563        }
 564
 565        F = (ratio * (R+2)) / 1000 - 2;
 566
 567        if (unlikely(F < 0 || F > 127)) {
 568                /* Invalid F */
 569                printk(KERN_ERR DRV_NAME ": F[%d] invalid!\n", F);
 570                return;
 571        }
 572
 573        PDPRINTK("F[%d] R[%d] ratio*1000[%ld]\n", F, R, ratio);
 574
 575        pll_ctl = (R << 8) | F;
 576
 577        PDPRINTK("Writing pll_ctl[%X]\n", pll_ctl);
 578
 579        iowrite16(pll_ctl, mmio_base + PDC_PLL_CTL);
 580        ioread16(mmio_base + PDC_PLL_CTL); /* flush */
 581
 582        /* Wait the PLL circuit to be stable */
 583        mdelay(30);
 584
 585#ifdef PDC_DEBUG
 586        /*
 587         *  Show the current clock value of PLL control register
 588         * (maybe configured by the firmware)
 589         */
 590        pll_ctl = ioread16(mmio_base + PDC_PLL_CTL);
 591
 592        PDPRINTK("pll_ctl[%X]\n", pll_ctl);
 593#endif
 594
 595        return;
 596}
 597
 598/**
 599 * detect_pll_input_clock - Detect the PLL input clock in Hz.
 600 * @host: target ATA host
 601 * Ex. 16949000 on 33MHz PCI bus for pdc20275.
 602 *     Half of the PCI clock.
 603 */
 604static long pdc_detect_pll_input_clock(struct ata_host *host)
 605{
 606        void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
 607        u32 scr;
 608        long start_count, end_count;
 609        struct timeval start_time, end_time;
 610        long pll_clock, usec_elapsed;
 611
 612        /* Start the test mode */
 613        scr = ioread32(mmio_base + PDC_SYS_CTL);
 614        PDPRINTK("scr[%X]\n", scr);
 615        iowrite32(scr | (0x01 << 14), mmio_base + PDC_SYS_CTL);
 616        ioread32(mmio_base + PDC_SYS_CTL); /* flush */
 617
 618        /* Read current counter value */
 619        start_count = pdc_read_counter(host);
 620        do_gettimeofday(&start_time);
 621
 622        /* Let the counter run for 100 ms. */
 623        mdelay(100);
 624
 625        /* Read the counter values again */
 626        end_count = pdc_read_counter(host);
 627        do_gettimeofday(&end_time);
 628
 629        /* Stop the test mode */
 630        scr = ioread32(mmio_base + PDC_SYS_CTL);
 631        PDPRINTK("scr[%X]\n", scr);
 632        iowrite32(scr & ~(0x01 << 14), mmio_base + PDC_SYS_CTL);
 633        ioread32(mmio_base + PDC_SYS_CTL); /* flush */
 634
 635        /* calculate the input clock in Hz */
 636        usec_elapsed = (end_time.tv_sec - start_time.tv_sec) * 1000000 +
 637                (end_time.tv_usec - start_time.tv_usec);
 638
 639        pll_clock = ((start_count - end_count) & 0x3fffffff) / 100 *
 640                (100000000 / usec_elapsed);
 641
 642        PDPRINTK("start[%ld] end[%ld] \n", start_count, end_count);
 643        PDPRINTK("PLL input clock[%ld]Hz\n", pll_clock);
 644
 645        return pll_clock;
 646}
 647
 648/**
 649 * pdc_hardware_init - Initialize the hardware.
 650 * @host: target ATA host
 651 * @board_idx: board identifier
 652 */
 653static int pdc_hardware_init(struct ata_host *host, unsigned int board_idx)
 654{
 655        long pll_clock;
 656
 657        /*
 658         * Detect PLL input clock rate.
 659         * On some system, where PCI bus is running at non-standard clock rate.
 660         * Ex. 25MHz or 40MHz, we have to adjust the cycle_time.
 661         * The pdc20275 controller employs PLL circuit to help correct timing registers setting.
 662         */
 663        pll_clock = pdc_detect_pll_input_clock(host);
 664
 665        dev_printk(KERN_INFO, host->dev, "PLL input clock %ld kHz\n", pll_clock/1000);
 666
 667        /* Adjust PLL control register */
 668        pdc_adjust_pll(host, pll_clock, board_idx);
 669
 670        return 0;
 671}
 672
 673/**
 674 * pdc_ata_setup_port - setup the mmio address
 675 * @port: ata ioports to setup
 676 * @base: base address
 677 */
 678static void pdc_ata_setup_port(struct ata_ioports *port, void __iomem *base)
 679{
 680        port->cmd_addr          =
 681        port->data_addr         = base;
 682        port->feature_addr      =
 683        port->error_addr        = base + 0x05;
 684        port->nsect_addr        = base + 0x0a;
 685        port->lbal_addr         = base + 0x0f;
 686        port->lbam_addr         = base + 0x10;
 687        port->lbah_addr         = base + 0x15;
 688        port->device_addr       = base + 0x1a;
 689        port->command_addr      =
 690        port->status_addr       = base + 0x1f;
 691        port->altstatus_addr    =
 692        port->ctl_addr          = base + 0x81a;
 693}
 694
 695/**
 696 * pdc2027x_init_one - PCI probe function
 697 * Called when an instance of PCI adapter is inserted.
 698 * This function checks whether the hardware is supported,
 699 * initialize hardware and register an instance of ata_host to
 700 * libata.  (implements struct pci_driver.probe() )
 701 *
 702 * @pdev: instance of pci_dev found
 703 * @ent:  matching entry in the id_tbl[]
 704 */
 705static int __devinit pdc2027x_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 706{
 707        static int printed_version;
 708        static const unsigned long cmd_offset[] = { 0x17c0, 0x15c0 };
 709        static const unsigned long bmdma_offset[] = { 0x1000, 0x1008 };
 710        unsigned int board_idx = (unsigned int) ent->driver_data;
 711        const struct ata_port_info *ppi[] =
 712                { &pdc2027x_port_info[board_idx], NULL };
 713        struct ata_host *host;
 714        void __iomem *mmio_base;
 715        int i, rc;
 716
 717        if (!printed_version++)
 718                dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 719
 720        /* alloc host */
 721        host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
 722        if (!host)
 723                return -ENOMEM;
 724
 725        /* acquire resources and fill host */
 726        rc = pcim_enable_device(pdev);
 727        if (rc)
 728                return rc;
 729
 730        rc = pcim_iomap_regions(pdev, 1 << PDC_MMIO_BAR, DRV_NAME);
 731        if (rc)
 732                return rc;
 733        host->iomap = pcim_iomap_table(pdev);
 734
 735        rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
 736        if (rc)
 737                return rc;
 738
 739        rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
 740        if (rc)
 741                return rc;
 742
 743        mmio_base = host->iomap[PDC_MMIO_BAR];
 744
 745        for (i = 0; i < 2; i++) {
 746                struct ata_port *ap = host->ports[i];
 747
 748                pdc_ata_setup_port(&ap->ioaddr, mmio_base + cmd_offset[i]);
 749                ap->ioaddr.bmdma_addr = mmio_base + bmdma_offset[i];
 750
 751                ata_port_pbar_desc(ap, PDC_MMIO_BAR, -1, "mmio");
 752                ata_port_pbar_desc(ap, PDC_MMIO_BAR, cmd_offset[i], "cmd");
 753        }
 754
 755        //pci_enable_intx(pdev);
 756
 757        /* initialize adapter */
 758        if (pdc_hardware_init(host, board_idx) != 0)
 759                return -EIO;
 760
 761        pci_set_master(pdev);
 762        return ata_host_activate(host, pdev->irq, ata_sff_interrupt,
 763                                 IRQF_SHARED, &pdc2027x_sht);
 764}
 765
 766/**
 767 * pdc2027x_init - Called after this module is loaded into the kernel.
 768 */
 769static int __init pdc2027x_init(void)
 770{
 771        return pci_register_driver(&pdc2027x_pci_driver);
 772}
 773
 774/**
 775 * pdc2027x_exit - Called before this module unloaded from the kernel
 776 */
 777static void __exit pdc2027x_exit(void)
 778{
 779        pci_unregister_driver(&pdc2027x_pci_driver);
 780}
 781
 782module_init(pdc2027x_init);
 783module_exit(pdc2027x_exit);
 784