drivers/ata/sata_sx4.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  sata_sx4.c - Promise SATA
   4  *
   5  *  Maintained by:  Tejun Heo <tj@kernel.org>
   6  *                  Please ALWAYS copy linux-ide@vger.kernel.org
   7  *                  on emails.
   8  *
   9  *  Copyright 2003-2004 Red Hat, Inc.
  10  *
  11  *  libata documentation is available via 'make {ps|pdf}docs',
  12  *  as Documentation/driver-api/libata.rst
  13  *
  14  *  Hardware documentation available under NDA.
  15  */
  16
  17 /*
  18         Theory of operation
  19         -------------------
  20
  21         The SX4 (PDC20621) chip features a single Host DMA (HDMA) copy
  22         engine, DIMM memory, and four ATA engines (one per SATA port).
  23         Data is copied to/from DIMM memory by the HDMA engine, before
  24         handing off to one (or more) of the ATA engines.  The ATA
  25         engines operate solely on DIMM memory.
  26
  27         The SX4 behaves like a PATA chip, with no SATA controls or
  28         knowledge whatsoever, leading to the presumption that
  29         PATA<->SATA bridges exist on SX4 boards, external to the
  30         PDC20621 chip itself.
  31
  32         The chip is quite capable, supporting an XOR engine and linked
  33         hardware commands (permits a string to transactions to be
  34         submitted and waited-on as a single unit), and an optional
  35         microprocessor.
  36
  37         The limiting factor is largely software.  This Linux driver was
  38         written to multiplex the single HDMA engine to copy disk
  39         transactions into a fixed DIMM memory space, from where an ATA
  40         engine takes over.  As a result, each WRITE looks like this:
  41
  42                 submit HDMA packet to hardware
  43                 hardware copies data from system memory to DIMM
  44                 hardware raises interrupt
  45
  46                 submit ATA packet to hardware
  47                 hardware executes ATA WRITE command, w/ data in DIMM
  48                 hardware raises interrupt
  49
  50         and each READ looks like this:
  51
  52                 submit ATA packet to hardware
  53                 hardware executes ATA READ command, w/ data in DIMM
  54                 hardware raises interrupt
  55
  56                 submit HDMA packet to hardware
  57                 hardware copies data from DIMM to system memory
  58                 hardware raises interrupt
  59
  60         This is a very slow, lock-step way of doing things that can
  61         certainly be improved by motivated kernel hackers.
  62
  63  */
  64
  65 #include <linux/kernel.h>
  66 #include <linux/module.h>
  67 #include <linux/pci.h>
  68 #include <linux/slab.h>
  69 #include <linux/blkdev.h>
  70 #include <linux/delay.h>
  71 #include <linux/interrupt.h>
  72 #include <linux/device.h>
  73 #include <scsi/scsi_host.h>
  74 #include <scsi/scsi_cmnd.h>
  75 #include <linux/libata.h>
  76 #include "sata_promise.h"
  77
  78 #define DRV_NAME        "sata_sx4"
  79 #define DRV_VERSION     "0.12"
  80
  81
  82 enum {
  83         PDC_MMIO_BAR            = 3,
  84         PDC_DIMM_BAR            = 4,
  85
  86         PDC_PRD_TBL             = 0x44, /* Direct command DMA table addr */
  87
  88         PDC_PKT_SUBMIT          = 0x40, /* Command packet pointer addr */
  89         PDC_HDMA_PKT_SUBMIT     = 0x100, /* Host DMA packet pointer addr */
  90         PDC_INT_SEQMASK         = 0x40, /* Mask of asserted SEQ INTs */
  91         PDC_HDMA_CTLSTAT        = 0x12C, /* Host DMA control / status */
  92
  93         PDC_CTLSTAT             = 0x60, /* IDEn control / status */
  94
  95         PDC_20621_SEQCTL        = 0x400,
  96         PDC_20621_SEQMASK       = 0x480,
  97         PDC_20621_GENERAL_CTL   = 0x484,
  98         PDC_20621_PAGE_SIZE     = (32 * 1024),
  99
 100         /* chosen, not constant, values; we design our own DIMM mem map */
 101         PDC_20621_DIMM_WINDOW   = 0x0C, /* page# for 32K DIMM window */
 102         PDC_20621_DIMM_BASE     = 0x00200000,
 103         PDC_20621_DIMM_DATA     = (64 * 1024),
 104         PDC_DIMM_DATA_STEP      = (256 * 1024),
 105         PDC_DIMM_WINDOW_STEP    = (8 * 1024),
 106         PDC_DIMM_HOST_PRD       = (6 * 1024),
 107         PDC_DIMM_HOST_PKT       = (128 * 0),
 108         PDC_DIMM_HPKT_PRD       = (128 * 1),
 109         PDC_DIMM_ATA_PKT        = (128 * 2),
 110         PDC_DIMM_APKT_PRD       = (128 * 3),
 111         PDC_DIMM_HEADER_SZ      = PDC_DIMM_APKT_PRD + 128,
 112         PDC_PAGE_WINDOW         = 0x40,
 113         PDC_PAGE_DATA           = PDC_PAGE_WINDOW +
 114                                   (PDC_20621_DIMM_DATA / PDC_20621_PAGE_SIZE),
 115         PDC_PAGE_SET            = PDC_DIMM_DATA_STEP / PDC_20621_PAGE_SIZE,
 116
 117         PDC_CHIP0_OFS           = 0xC0000, /* offset of chip #0 */
 118
 119         PDC_20621_ERR_MASK      = (1<<19) | (1<<20) | (1<<21) | (1<<22) |
 120                                   (1<<23),
 121
 122         board_20621             = 0,    /* FastTrak S150 SX4 */
 123
 124         PDC_MASK_INT            = (1 << 10), /* HDMA/ATA mask int */
 125         PDC_RESET               = (1 << 11), /* HDMA/ATA reset */
 126         PDC_DMA_ENABLE          = (1 << 7),  /* DMA start/stop */
 127
 128         PDC_MAX_HDMA            = 32,
 129         PDC_HDMA_Q_MASK         = (PDC_MAX_HDMA - 1),
 130
 131         PDC_DIMM0_SPD_DEV_ADDRESS       = 0x50,
 132         PDC_DIMM1_SPD_DEV_ADDRESS       = 0x51,
 133         PDC_I2C_CONTROL                 = 0x48,
 134         PDC_I2C_ADDR_DATA               = 0x4C,
 135         PDC_DIMM0_CONTROL               = 0x80,
 136         PDC_DIMM1_CONTROL               = 0x84,
 137         PDC_SDRAM_CONTROL               = 0x88,
 138         PDC_I2C_WRITE                   = 0,            /* master -> slave */
 139         PDC_I2C_READ                    = (1 << 6),     /* master <- slave */
 140         PDC_I2C_START                   = (1 << 7),     /* start I2C proto */
 141         PDC_I2C_MASK_INT                = (1 << 5),     /* mask I2C interrupt */
 142         PDC_I2C_COMPLETE                = (1 << 16),    /* I2C normal compl. */
 143         PDC_I2C_NO_ACK                  = (1 << 20),    /* slave no-ack addr */
 144         PDC_DIMM_SPD_SUBADDRESS_START   = 0x00,
 145         PDC_DIMM_SPD_SUBADDRESS_END     = 0x7F,
 146         PDC_DIMM_SPD_ROW_NUM            = 3,
 147         PDC_DIMM_SPD_COLUMN_NUM         = 4,
 148         PDC_DIMM_SPD_MODULE_ROW         = 5,
 149         PDC_DIMM_SPD_TYPE               = 11,
 150         PDC_DIMM_SPD_FRESH_RATE         = 12,
 151         PDC_DIMM_SPD_BANK_NUM           = 17,
 152         PDC_DIMM_SPD_CAS_LATENCY        = 18,
 153         PDC_DIMM_SPD_ATTRIBUTE          = 21,
 154         PDC_DIMM_SPD_ROW_PRE_CHARGE     = 27,
 155         PDC_DIMM_SPD_ROW_ACTIVE_DELAY   = 28,
 156         PDC_DIMM_SPD_RAS_CAS_DELAY      = 29,
 157         PDC_DIMM_SPD_ACTIVE_PRECHARGE   = 30,
 158         PDC_DIMM_SPD_SYSTEM_FREQ        = 126,
 159         PDC_CTL_STATUS                  = 0x08,
 160         PDC_DIMM_WINDOW_CTLR            = 0x0C,
 161         PDC_TIME_CONTROL                = 0x3C,
 162         PDC_TIME_PERIOD                 = 0x40,
 163         PDC_TIME_COUNTER                = 0x44,
 164         PDC_GENERAL_CTLR                = 0x484,
 165         PCI_PLL_INIT                    = 0x8A531824,
 166         PCI_X_TCOUNT                    = 0xEE1E5CFF,
 167
 168         /* PDC_TIME_CONTROL bits */
 169         PDC_TIMER_BUZZER                = (1 << 10),
 170         PDC_TIMER_MODE_PERIODIC         = 0,            /* bits 9:8 == 00 */
 171         PDC_TIMER_MODE_ONCE             = (1 << 8),     /* bits 9:8 == 01 */
 172         PDC_TIMER_ENABLE                = (1 << 7),
 173         PDC_TIMER_MASK_INT              = (1 << 5),
 174         PDC_TIMER_SEQ_MASK              = 0x1f,         /* SEQ ID for timer */
 175         PDC_TIMER_DEFAULT               = PDC_TIMER_MODE_ONCE |
 176                                           PDC_TIMER_ENABLE |
 177                                           PDC_TIMER_MASK_INT,
 178 };
 179
 180 #define ECC_ERASE_BUF_SZ (128 * 1024)
 181
 182 struct pdc_port_priv {
 183         u8                      dimm_buf[(ATA_PRD_SZ * ATA_MAX_PRD) + 512];
 184         u8                      *pkt;
 185         dma_addr_t              pkt_dma;
 186 };
 187
 188 struct pdc_host_priv {
 189         unsigned int            doing_hdma;
 190         unsigned int            hdma_prod;
 191         unsigned int            hdma_cons;
 192         struct {
 193                 struct ata_queued_cmd *qc;
 194                 unsigned int    seq;
 195                 unsigned long   pkt_ofs;
 196         } hdma[32];
 197 };
 198
 199
 200 static int pdc_sata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
 201 static void pdc_error_handler(struct ata_port *ap);
 202 static void pdc_freeze(struct ata_port *ap);
 203 static void pdc_thaw(struct ata_port *ap);
 204 static int pdc_port_start(struct ata_port *ap);
 205 static void pdc20621_qc_prep(struct ata_queued_cmd *qc);
 206 static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
 207 static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
 208 static unsigned int pdc20621_dimm_init(struct ata_host *host);
 209 static int pdc20621_detect_dimm(struct ata_host *host);
 210 static unsigned int pdc20621_i2c_read(struct ata_host *host,
 211                                       u32 device, u32 subaddr, u32 *pdata);
 212 static int pdc20621_prog_dimm0(struct ata_host *host);
 213 static unsigned int pdc20621_prog_dimm_global(struct ata_host *host);
 214 #ifdef ATA_VERBOSE_DEBUG
 215 static void pdc20621_get_from_dimm(struct ata_host *host,
 216                                    void *psource, u32 offset, u32 size);
 217 #endif
 218 static void pdc20621_put_to_dimm(struct ata_host *host,
 219                                  void *psource, u32 offset, u32 size);
 220 static void pdc20621_irq_clear(struct ata_port *ap);
 221 static unsigned int pdc20621_qc_issue(struct ata_queued_cmd *qc);
 222 static int pdc_softreset(struct ata_link *link, unsigned int *class,
 223                          unsigned long deadline);
 224 static void pdc_post_internal_cmd(struct ata_queued_cmd *qc);
 225 static int pdc_check_atapi_dma(struct ata_queued_cmd *qc);
 226
 227
 228 static struct scsi_host_template pdc_sata_sht = {
 229         ATA_BASE_SHT(DRV_NAME),
 230         .sg_tablesize           = LIBATA_MAX_PRD,
 231         .dma_boundary           = ATA_DMA_BOUNDARY,
 232 };
 233
 234 /* TODO: inherit from base port_ops after converting to new EH */
 235 static struct ata_port_operations pdc_20621_ops = {
 236         .inherits               = &ata_sff_port_ops,
 237
 238         .check_atapi_dma        = pdc_check_atapi_dma,
 239         .qc_prep                = pdc20621_qc_prep,
 240         .qc_issue               = pdc20621_qc_issue,
 241
 242         .freeze                 = pdc_freeze,
 243         .thaw                   = pdc_thaw,
 244         .softreset              = pdc_softreset,
 245         .error_handler          = pdc_error_handler,
 246         .lost_interrupt         = ATA_OP_NULL,
 247         .post_internal_cmd      = pdc_post_internal_cmd,
 248
 249         .port_start             = pdc_port_start,
 250
 251         .sff_tf_load            = pdc_tf_load_mmio,
 252         .sff_exec_command       = pdc_exec_command_mmio,
 253         .sff_irq_clear          = pdc20621_irq_clear,
 254 };
 255
 256 static const struct ata_port_info pdc_port_info[] = {
 257         /* board_20621 */
 258         {
 259                 .flags          = ATA_FLAG_SATA | ATA_FLAG_NO_ATAPI |
 260                                   ATA_FLAG_PIO_POLLING,
 261                 .pio_mask       = ATA_PIO4,
 262                 .mwdma_mask     = ATA_MWDMA2,
 263                 .udma_mask      = ATA_UDMA6,
 264                 .port_ops       = &pdc_20621_ops,
 265         },
 266
 267 };
 268
 269 static const struct pci_device_id pdc_sata_pci_tbl[] = {
 270         { PCI_VDEVICE(PROMISE, 0x6622), board_20621 },
 271
 272         { }     /* terminate list */
 273 };
 274
 275 static struct pci_driver pdc_sata_pci_driver = {
 276         .name                   = DRV_NAME,
 277         .id_table               = pdc_sata_pci_tbl,
 278         .probe                  = pdc_sata_init_one,
 279         .remove                 = ata_pci_remove_one,
 280 };
 281
 282
 283 static int pdc_port_start(struct ata_port *ap)
 284 {
 285         struct device *dev = ap->host->dev;
 286         struct pdc_port_priv *pp;
 287
 288         pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
 289         if (!pp)
 290                 return -ENOMEM;
 291
 292         pp->pkt = dmam_alloc_coherent(dev, 128, &pp->pkt_dma, GFP_KERNEL);
 293         if (!pp->pkt)
 294                 return -ENOMEM;
 295
 296         ap->private_data = pp;
 297
 298         return 0;
 299 }
 300
 301 static inline void pdc20621_ata_sg(u8 *buf, unsigned int portno,
 302                                    unsigned int total_len)
 303 {
 304         u32 addr;
 305         unsigned int dw = PDC_DIMM_APKT_PRD >> 2;
 306         __le32 *buf32 = (__le32 *) buf;
 307
 308         /* output ATA packet S/G table */
 309         addr = PDC_20621_DIMM_BASE + PDC_20621_DIMM_DATA +
 310                (PDC_DIMM_DATA_STEP * portno);
 311         VPRINTK("ATA sg addr 0x%x, %d\n", addr, addr);
 312         buf32[dw] = cpu_to_le32(addr);
 313         buf32[dw + 1] = cpu_to_le32(total_len | ATA_PRD_EOT);
 314
 315         VPRINTK("ATA PSG @ %x == (0x%x, 0x%x)\n",
 316                 PDC_20621_DIMM_BASE +
 317                        (PDC_DIMM_WINDOW_STEP * portno) +
 318                        PDC_DIMM_APKT_PRD,
 319                 buf32[dw], buf32[dw + 1]);
 320 }
 321
 322 static inline void pdc20621_host_sg(u8 *buf, unsigned int portno,
 323                                     unsigned int total_len)
 324 {
 325         u32 addr;
 326         unsigned int dw = PDC_DIMM_HPKT_PRD >> 2;
 327         __le32 *buf32 = (__le32 *) buf;
 328
 329         /* output Host DMA packet S/G table */
 330         addr = PDC_20621_DIMM_BASE + PDC_20621_DIMM_DATA +
 331                (PDC_DIMM_DATA_STEP * portno);
 332
 333         buf32[dw] = cpu_to_le32(addr);
 334         buf32[dw + 1] = cpu_to_le32(total_len | ATA_PRD_EOT);
 335
 336         VPRINTK("HOST PSG @ %x == (0x%x, 0x%x)\n",
 337                 PDC_20621_DIMM_BASE +
 338                        (PDC_DIMM_WINDOW_STEP * portno) +
 339                        PDC_DIMM_HPKT_PRD,
 340                 buf32[dw], buf32[dw + 1]);
 341 }
 342
 343 static inline unsigned int pdc20621_ata_pkt(struct ata_taskfile *tf,
 344                                             unsigned int devno, u8 *buf,
 345                                             unsigned int portno)
 346 {
 347         unsigned int i, dw;
 348         __le32 *buf32 = (__le32 *) buf;
 349         u8 dev_reg;
 350
 351         unsigned int dimm_sg = PDC_20621_DIMM_BASE +
 352                                (PDC_DIMM_WINDOW_STEP * portno) +
 353                                PDC_DIMM_APKT_PRD;
 354         VPRINTK("ENTER, dimm_sg == 0x%x, %d\n", dimm_sg, dimm_sg);
 355
 356         i = PDC_DIMM_ATA_PKT;
 357
 358         /*
 359          * Set up ATA packet
 360          */
 361         if ((tf->protocol == ATA_PROT_DMA) && (!(tf->flags & ATA_TFLAG_WRITE)))
 362                 buf[i++] = PDC_PKT_READ;
 363         else if (tf->protocol == ATA_PROT_NODATA)
 364                 buf[i++] = PDC_PKT_NODATA;
 365         else
 366                 buf[i++] = 0;
 367         buf[i++] = 0;                   /* reserved */
 368         buf[i++] = portno + 1;          /* seq. id */
 369         buf[i++] = 0xff;                /* delay seq. id */
 370
 371         /* dimm dma S/G, and next-pkt */
 372         dw = i >> 2;
 373         if (tf->protocol == ATA_PROT_NODATA)
 374                 buf32[dw] = 0;
 375         else
 376                 buf32[dw] = cpu_to_le32(dimm_sg);
 377         buf32[dw + 1] = 0;
 378         i += 8;
 379
 380         if (devno == 0)
 381                 dev_reg = ATA_DEVICE_OBS;
 382         else
 383                 dev_reg = ATA_DEVICE_OBS | ATA_DEV1;
 384
 385         /* select device */
 386         buf[i++] = (1 << 5) | PDC_PKT_CLEAR_BSY | ATA_REG_DEVICE;
 387         buf[i++] = dev_reg;
 388
 389         /* device control register */
 390         buf[i++] = (1 << 5) | PDC_REG_DEVCTL;
 391         buf[i++] = tf->ctl;
 392
 393         return i;
 394 }
 395
 396 static inline void pdc20621_host_pkt(struct ata_taskfile *tf, u8 *buf,
 397                                      unsigned int portno)
 398 {
 399         unsigned int dw;
 400         u32 tmp;
 401         __le32 *buf32 = (__le32 *) buf;
 402
 403         unsigned int host_sg = PDC_20621_DIMM_BASE +
 404                                (PDC_DIMM_WINDOW_STEP * portno) +
 405                                PDC_DIMM_HOST_PRD;
 406         unsigned int dimm_sg = PDC_20621_DIMM_BASE +
 407                                (PDC_DIMM_WINDOW_STEP * portno) +
 408                                PDC_DIMM_HPKT_PRD;
 409         VPRINTK("ENTER, dimm_sg == 0x%x, %d\n", dimm_sg, dimm_sg);
 410         VPRINTK("host_sg == 0x%x, %d\n", host_sg, host_sg);
 411
 412         dw = PDC_DIMM_HOST_PKT >> 2;
 413
 414         /*
 415          * Set up Host DMA packet
 416          */
 417         if ((tf->protocol == ATA_PROT_DMA) && (!(tf->flags & ATA_TFLAG_WRITE)))
 418                 tmp = PDC_PKT_READ;
 419         else
 420                 tmp = 0;
 421         tmp |= ((portno + 1 + 4) << 16);        /* seq. id */
 422         tmp |= (0xff << 24);                    /* delay seq. id */
 423         buf32[dw + 0] = cpu_to_le32(tmp);
 424         buf32[dw + 1] = cpu_to_le32(host_sg);
 425         buf32[dw + 2] = cpu_to_le32(dimm_sg);
 426         buf32[dw + 3] = 0;
 427
 428         VPRINTK("HOST PKT @ %x == (0x%x 0x%x 0x%x 0x%x)\n",
 429                 PDC_20621_DIMM_BASE + (PDC_DIMM_WINDOW_STEP * portno) +
 430                         PDC_DIMM_HOST_PKT,
 431                 buf32[dw + 0],
 432                 buf32[dw + 1],
 433                 buf32[dw + 2],
 434                 buf32[dw + 3]);
 435 }
 436
 437 static void pdc20621_dma_prep(struct ata_queued_cmd *qc)
 438 {
 439         struct scatterlist *sg;
 440         struct ata_port *ap = qc->ap;
 441         struct pdc_port_priv *pp = ap->private_data;
 442         void __iomem *mmio = ap->host->iomap[PDC_MMIO_BAR];
 443         void __iomem *dimm_mmio = ap->host->iomap[PDC_DIMM_BAR];
 444         unsigned int portno = ap->port_no;
 445         unsigned int i, si, idx, total_len = 0, sgt_len;
 446         __le32 *buf = (__le32 *) &pp->dimm_buf[PDC_DIMM_HEADER_SZ];
 447
 448         WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
 449
 450         VPRINTK("ata%u: ENTER\n", ap->print_id);
 451
 452         /* hard-code chip #0 */
 453         mmio += PDC_CHIP0_OFS;
 454
 455         /*
 456          * Build S/G table
 457          */
 458         idx = 0;
 459         for_each_sg(qc->sg, sg, qc->n_elem, si) {
 460                 buf[idx++] = cpu_to_le32(sg_dma_address(sg));
 461                 buf[idx++] = cpu_to_le32(sg_dma_len(sg));
 462                 total_len += sg_dma_len(sg);
 463         }
 464         buf[idx - 1] |= cpu_to_le32(ATA_PRD_EOT);
 465         sgt_len = idx * 4;
 466
 467         /*
 468          * Build ATA, host DMA packets
 469          */
 470         pdc20621_host_sg(&pp->dimm_buf[0], portno, total_len);
 471         pdc20621_host_pkt(&qc->tf, &pp->dimm_buf[0], portno);
 472
 473         pdc20621_ata_sg(&pp->dimm_buf[0], portno, total_len);
 474         i = pdc20621_ata_pkt(&qc->tf, qc->dev->devno, &pp->dimm_buf[0], portno);
 475
 476         if (qc->tf.flags & ATA_TFLAG_LBA48)
 477                 i = pdc_prep_lba48(&qc->tf, &pp->dimm_buf[0], i);
 478         else
 479                 i = pdc_prep_lba28(&qc->tf, &pp->dimm_buf[0], i);
 480
 481         pdc_pkt_footer(&qc->tf, &pp->dimm_buf[0], i);
 482
 483         /* copy three S/G tables and two packets to DIMM MMIO window */
 484         memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP),
 485                     &pp->dimm_buf, PDC_DIMM_HEADER_SZ);
 486         memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP) +
 487                     PDC_DIMM_HOST_PRD,
 488                     &pp->dimm_buf[PDC_DIMM_HEADER_SZ], sgt_len);
 489
 490         /* force host FIFO dump */
 491         writel(0x00000001, mmio + PDC_20621_GENERAL_CTL);
 492
 493         readl(dimm_mmio);       /* MMIO PCI posting flush */
 494
 495         VPRINTK("ata pkt buf ofs %u, prd size %u, mmio copied\n", i, sgt_len);
 496 }
 497
 498 static void pdc20621_nodata_prep(struct ata_queued_cmd *qc)
 499 {
 500         struct ata_port *ap = qc->ap;
 501         struct pdc_port_priv *pp = ap->private_data;
 502         void __iomem *mmio = ap->host->iomap[PDC_MMIO_BAR];
 503         void __iomem *dimm_mmio = ap->host->iomap[PDC_DIMM_BAR];
 504         unsigned int portno = ap->port_no;
 505         unsigned int i;
 506
 507         VPRINTK("ata%u: ENTER\n", ap->print_id);
 508
 509         /* hard-code chip #0 */
 510         mmio += PDC_CHIP0_OFS;
 511
 512         i = pdc20621_ata_pkt(&qc->tf, qc->dev->devno, &pp->dimm_buf[0], portno);
 513
 514         if (qc->tf.flags & ATA_TFLAG_LBA48)
 515                 i = pdc_prep_lba48(&qc->tf, &pp->dimm_buf[0], i);
 516         else
 517                 i = pdc_prep_lba28(&qc->tf, &pp->dimm_buf[0], i);
 518
 519         pdc_pkt_footer(&qc->tf, &pp->dimm_buf[0], i);
 520
 521         /* copy three S/G tables and two packets to DIMM MMIO window */
 522         memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP),
 523                     &pp->dimm_buf, PDC_DIMM_HEADER_SZ);
 524
 525         /* force host FIFO dump */
 526         writel(0x00000001, mmio + PDC_20621_GENERAL_CTL);
 527
 528         readl(dimm_mmio);       /* MMIO PCI posting flush */
 529
 530         VPRINTK("ata pkt buf ofs %u, mmio copied\n", i);
 531 }
 532
 533 static void pdc20621_qc_prep(struct ata_queued_cmd *qc)
 534 {
 535         switch (qc->tf.protocol) {
 536         case ATA_PROT_DMA:
 537                 pdc20621_dma_prep(qc);
 538                 break;
 539         case ATA_PROT_NODATA:
 540                 pdc20621_nodata_prep(qc);
 541                 break;
 542         default:
 543                 break;
 544         }
 545 }
 546
 547 static void __pdc20621_push_hdma(struct ata_queued_cmd *qc,
 548                                  unsigned int seq,
 549                                  u32 pkt_ofs)
 550 {
 551         struct ata_port *ap = qc->ap;
 552         struct ata_host *host = ap->host;
 553         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
 554
 555         /* hard-code chip #0 */
 556         mmio += PDC_CHIP0_OFS;
 557
 558         writel(0x00000001, mmio + PDC_20621_SEQCTL + (seq * 4));
 559         readl(mmio + PDC_20621_SEQCTL + (seq * 4));     /* flush */
 560
 561         writel(pkt_ofs, mmio + PDC_HDMA_PKT_SUBMIT);
 562         readl(mmio + PDC_HDMA_PKT_SUBMIT);      /* flush */
 563 }
 564
 565 static void pdc20621_push_hdma(struct ata_queued_cmd *qc,
 566                                 unsigned int seq,
 567                                 u32 pkt_ofs)
 568 {
 569         struct ata_port *ap = qc->ap;
 570         struct pdc_host_priv *pp = ap->host->private_data;
 571         unsigned int idx = pp->hdma_prod & PDC_HDMA_Q_MASK;
 572
 573         if (!pp->doing_hdma) {
 574                 __pdc20621_push_hdma(qc, seq, pkt_ofs);
 575                 pp->doing_hdma = 1;
 576                 return;
 577         }
 578
 579         pp->hdma[idx].qc = qc;
 580         pp->hdma[idx].seq = seq;
 581         pp->hdma[idx].pkt_ofs = pkt_ofs;
 582         pp->hdma_prod++;
 583 }
 584
 585 static void pdc20621_pop_hdma(struct ata_queued_cmd *qc)
 586 {
 587         struct ata_port *ap = qc->ap;
 588         struct pdc_host_priv *pp = ap->host->private_data;
 589         unsigned int idx = pp->hdma_cons & PDC_HDMA_Q_MASK;
 590
 591         /* if nothing on queue, we're done */
 592         if (pp->hdma_prod == pp->hdma_cons) {
 593                 pp->doing_hdma = 0;
 594                 return;
 595         }
 596
 597         __pdc20621_push_hdma(pp->hdma[idx].qc, pp->hdma[idx].seq,
 598                              pp->hdma[idx].pkt_ofs);
 599         pp->hdma_cons++;
 600 }
 601
 602 #ifdef ATA_VERBOSE_DEBUG
 603 static void pdc20621_dump_hdma(struct ata_queued_cmd *qc)
 604 {
 605         struct ata_port *ap = qc->ap;
 606         unsigned int port_no = ap->port_no;
 607         void __iomem *dimm_mmio = ap->host->iomap[PDC_DIMM_BAR];
 608
 609         dimm_mmio += (port_no * PDC_DIMM_WINDOW_STEP);
 610         dimm_mmio += PDC_DIMM_HOST_PKT;
 611
 612         printk(KERN_ERR "HDMA[0] == 0x%08X\n", readl(dimm_mmio));
 613         printk(KERN_ERR "HDMA[1] == 0x%08X\n", readl(dimm_mmio + 4));
 614         printk(KERN_ERR "HDMA[2] == 0x%08X\n", readl(dimm_mmio + 8));
 615         printk(KERN_ERR "HDMA[3] == 0x%08X\n", readl(dimm_mmio + 12));
 616 }
 617 #else
 618 static inline void pdc20621_dump_hdma(struct ata_queued_cmd *qc) { }
 619 #endif /* ATA_VERBOSE_DEBUG */
 620
 621 static void pdc20621_packet_start(struct ata_queued_cmd *qc)
 622 {
 623         struct ata_port *ap = qc->ap;
 624         struct ata_host *host = ap->host;
 625         unsigned int port_no = ap->port_no;
 626         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
 627         unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
 628         u8 seq = (u8) (port_no + 1);
 629         unsigned int port_ofs;
 630
 631         /* hard-code chip #0 */
 632         mmio += PDC_CHIP0_OFS;
 633
 634         VPRINTK("ata%u: ENTER\n", ap->print_id);
 635
 636         wmb();                  /* flush PRD, pkt writes */
 637
 638         port_ofs = PDC_20621_DIMM_BASE + (PDC_DIMM_WINDOW_STEP * port_no);
 639
 640         /* if writing, we (1) DMA to DIMM, then (2) do ATA command */
 641         if (rw && qc->tf.protocol == ATA_PROT_DMA) {
 642                 seq += 4;
 643
 644                 pdc20621_dump_hdma(qc);
 645                 pdc20621_push_hdma(qc, seq, port_ofs + PDC_DIMM_HOST_PKT);
 646                 VPRINTK("queued ofs 0x%x (%u), seq %u\n",
 647                         port_ofs + PDC_DIMM_HOST_PKT,
 648                         port_ofs + PDC_DIMM_HOST_PKT,
 649                         seq);
 650         } else {
 651                 writel(0x00000001, mmio + PDC_20621_SEQCTL + (seq * 4));
 652                 readl(mmio + PDC_20621_SEQCTL + (seq * 4));     /* flush */
 653
 654                 writel(port_ofs + PDC_DIMM_ATA_PKT,
 655                        ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
 656                 readl(ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
 657                 VPRINTK("submitted ofs 0x%x (%u), seq %u\n",
 658                         port_ofs + PDC_DIMM_ATA_PKT,
 659                         port_ofs + PDC_DIMM_ATA_PKT,
 660                         seq);
 661         }
 662 }
 663
 664 static unsigned int pdc20621_qc_issue(struct ata_queued_cmd *qc)
 665 {
 666         switch (qc->tf.protocol) {
 667         case ATA_PROT_NODATA:
 668                 if (qc->tf.flags & ATA_TFLAG_POLLING)
 669                         break;
 670                 /*FALLTHROUGH*/
 671         case ATA_PROT_DMA:
 672                 pdc20621_packet_start(qc);
 673                 return 0;
 674
 675         case ATAPI_PROT_DMA:
 676                 BUG();
 677                 break;
 678
 679         default:
 680                 break;
 681         }
 682
 683         return ata_sff_qc_issue(qc);
 684 }
 685
 686 static inline unsigned int pdc20621_host_intr(struct ata_port *ap,
 687                                           struct ata_queued_cmd *qc,
 688                                           unsigned int doing_hdma,
 689                                           void __iomem *mmio)
 690 {
 691         unsigned int port_no = ap->port_no;
 692         unsigned int port_ofs =
 693                 PDC_20621_DIMM_BASE + (PDC_DIMM_WINDOW_STEP * port_no);
 694         u8 status;
 695         unsigned int handled = 0;
 696
 697         VPRINTK("ENTER\n");
 698
 699         if ((qc->tf.protocol == ATA_PROT_DMA) &&        /* read */
 700             (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
 701
 702                 /* step two - DMA from DIMM to host */
 703                 if (doing_hdma) {
 704                         VPRINTK("ata%u: read hdma, 0x%x 0x%x\n", ap->print_id,
 705                                 readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
 706                         /* get drive status; clear intr; complete txn */
 707                         qc->err_mask |= ac_err_mask(ata_wait_idle(ap));
 708                         ata_qc_complete(qc);
 709                         pdc20621_pop_hdma(qc);
 710                 }
 711
 712                 /* step one - exec ATA command */
 713                 else {
 714                         u8 seq = (u8) (port_no + 1 + 4);
 715                         VPRINTK("ata%u: read ata, 0x%x 0x%x\n", ap->print_id,
 716                                 readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
 717
 718                         /* submit hdma pkt */
 719                         pdc20621_dump_hdma(qc);
 720                         pdc20621_push_hdma(qc, seq,
 721                                            port_ofs + PDC_DIMM_HOST_PKT);
 722                 }
 723                 handled = 1;
 724
 725         } else if (qc->tf.protocol == ATA_PROT_DMA) {   /* write */
 726
 727                 /* step one - DMA from host to DIMM */
 728                 if (doing_hdma) {
 729                         u8 seq = (u8) (port_no + 1);
 730                         VPRINTK("ata%u: write hdma, 0x%x 0x%x\n", ap->print_id,
 731                                 readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
 732
 733                         /* submit ata pkt */
 734                         writel(0x00000001, mmio + PDC_20621_SEQCTL + (seq * 4));
 735                         readl(mmio + PDC_20621_SEQCTL + (seq * 4));
 736                         writel(port_ofs + PDC_DIMM_ATA_PKT,
 737                                ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
 738                         readl(ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
 739                 }
 740
 741                 /* step two - execute ATA command */
 742                 else {
 743                         VPRINTK("ata%u: write ata, 0x%x 0x%x\n", ap->print_id,
 744                                 readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
 745                         /* get drive status; clear intr; complete txn */
 746                         qc->err_mask |= ac_err_mask(ata_wait_idle(ap));
 747                         ata_qc_complete(qc);
 748                         pdc20621_pop_hdma(qc);
 749                 }
 750                 handled = 1;
 751
 752         /* command completion, but no data xfer */
 753         } else if (qc->tf.protocol == ATA_PROT_NODATA) {
 754
 755                 status = ata_sff_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
 756                 DPRINTK("BUS_NODATA (drv_stat 0x%X)\n", status);
 757                 qc->err_mask |= ac_err_mask(status);
 758                 ata_qc_complete(qc);
 759                 handled = 1;
 760
 761         } else {
 762                 ap->stats.idle_irq++;
 763         }
 764
 765         return handled;
 766 }
 767
 768 static void pdc20621_irq_clear(struct ata_port *ap)
 769 {
 770         ioread8(ap->ioaddr.status_addr);
 771 }
 772
 773 static irqreturn_t pdc20621_interrupt(int irq, void *dev_instance)
 774 {
 775         struct ata_host *host = dev_instance;
 776         struct ata_port *ap;
 777         u32 mask = 0;
 778         unsigned int i, tmp, port_no;
 779         unsigned int handled = 0;
 780         void __iomem *mmio_base;
 781
 782         VPRINTK("ENTER\n");
 783
 784         if (!host || !host->iomap[PDC_MMIO_BAR]) {
 785                 VPRINTK("QUICK EXIT\n");
 786                 return IRQ_NONE;
 787         }
 788
 789         mmio_base = host->iomap[PDC_MMIO_BAR];
 790
 791         /* reading should also clear interrupts */
 792         mmio_base += PDC_CHIP0_OFS;
 793         mask = readl(mmio_base + PDC_20621_SEQMASK);
 794         VPRINTK("mask == 0x%x\n", mask);
 795
 796         if (mask == 0xffffffff) {
 797                 VPRINTK("QUICK EXIT 2\n");
 798                 return IRQ_NONE;
 799         }
 800         mask &= 0xffff;         /* only 16 tags possible */
 801         if (!mask) {
 802                 VPRINTK("QUICK EXIT 3\n");
 803                 return IRQ_NONE;
 804         }
 805
 806         spin_lock(&host->lock);
 807
 808         for (i = 1; i < 9; i++) {
 809                 port_no = i - 1;
 810                 if (port_no > 3)
 811                         port_no -= 4;
 812                 if (port_no >= host->n_ports)
 813                         ap = NULL;
 814                 else
 815                         ap = host->ports[port_no];
 816                 tmp = mask & (1 << i);
 817                 VPRINTK("seq %u, port_no %u, ap %p, tmp %x\n", i, port_no, ap, tmp);
 818                 if (tmp && ap) {
 819                         struct ata_queued_cmd *qc;
 820
 821                         qc = ata_qc_from_tag(ap, ap->link.active_tag);
 822                         if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
 823                                 handled += pdc20621_host_intr(ap, qc, (i > 4),
 824                                                               mmio_base);
 825                 }
 826         }
 827
 828         spin_unlock(&host->lock);
 829
 830         VPRINTK("mask == 0x%x\n", mask);
 831
 832         VPRINTK("EXIT\n");
 833
 834         return IRQ_RETVAL(handled);
 835 }
 836
 837 static void pdc_freeze(struct ata_port *ap)
 838 {
 839         void __iomem *mmio = ap->ioaddr.cmd_addr;
 840         u32 tmp;
 841
 842         /* FIXME: if all 4 ATA engines are stopped, also stop HDMA engine */
 843
 844         tmp = readl(mmio + PDC_CTLSTAT);
 845         tmp |= PDC_MASK_INT;
 846         tmp &= ~PDC_DMA_ENABLE;
 847         writel(tmp, mmio + PDC_CTLSTAT);
 848         readl(mmio + PDC_CTLSTAT); /* flush */
 849 }
 850
 851 static void pdc_thaw(struct ata_port *ap)
 852 {
 853         void __iomem *mmio = ap->ioaddr.cmd_addr;
 854         u32 tmp;
 855
 856         /* FIXME: start HDMA engine, if zero ATA engines running */
 857
 858         /* clear IRQ */
 859         ioread8(ap->ioaddr.status_addr);
 860
 861         /* turn IRQ back on */
 862         tmp = readl(mmio + PDC_CTLSTAT);
 863         tmp &= ~PDC_MASK_INT;
 864         writel(tmp, mmio + PDC_CTLSTAT);
 865         readl(mmio + PDC_CTLSTAT); /* flush */
 866 }
 867
 868 static void pdc_reset_port(struct ata_port *ap)
 869 {
 870         void __iomem *mmio = ap->ioaddr.cmd_addr + PDC_CTLSTAT;
 871         unsigned int i;
 872         u32 tmp;
 873
 874         /* FIXME: handle HDMA copy engine */
 875
 876         for (i = 11; i > 0; i--) {
 877                 tmp = readl(mmio);
 878                 if (tmp & PDC_RESET)
 879                         break;
 880
 881                 udelay(100);
 882
 883                 tmp |= PDC_RESET;
 884                 writel(tmp, mmio);
 885         }
 886
 887         tmp &= ~PDC_RESET;
 888         writel(tmp, mmio);
 889         readl(mmio);    /* flush */
 890 }
 891
 892 static int pdc_softreset(struct ata_link *link, unsigned int *class,
 893                          unsigned long deadline)
 894 {
 895         pdc_reset_port(link->ap);
 896         return ata_sff_softreset(link, class, deadline);
 897 }
 898
 899 static void pdc_error_handler(struct ata_port *ap)
 900 {
 901         if (!(ap->pflags & ATA_PFLAG_FROZEN))
 902                 pdc_reset_port(ap);
 903
 904         ata_sff_error_handler(ap);
 905 }
 906
 907 static void pdc_post_internal_cmd(struct ata_queued_cmd *qc)
 908 {
 909         struct ata_port *ap = qc->ap;
 910
 911         /* make DMA engine forget about the failed command */
 912         if (qc->flags & ATA_QCFLAG_FAILED)
 913                 pdc_reset_port(ap);
 914 }
 915
 916 static int pdc_check_atapi_dma(struct ata_queued_cmd *qc)
 917 {
 918         u8 *scsicmd = qc->scsicmd->cmnd;
 919         int pio = 1; /* atapi dma off by default */
 920
 921         /* Whitelist commands that may use DMA. */
 922         switch (scsicmd[0]) {
 923         case WRITE_12:
 924         case WRITE_10:
 925         case WRITE_6:
 926         case READ_12:
 927         case READ_10:
 928         case READ_6:
 929         case 0xad: /* READ_DVD_STRUCTURE */
 930         case 0xbe: /* READ_CD */
 931                 pio = 0;
 932         }
 933         /* -45150 (FFFF4FA2) to -1 (FFFFFFFF) shall use PIO mode */
 934         if (scsicmd[0] == WRITE_10) {
 935                 unsigned int lba =
 936                         (scsicmd[2] << 24) |
 937                         (scsicmd[3] << 16) |
 938                         (scsicmd[4] << 8) |
 939                         scsicmd[5];
 940                 if (lba >= 0xFFFF4FA2)
 941                         pio = 1;
 942         }
 943         return pio;
 944 }
 945
 946 static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
 947 {
 948         WARN_ON(tf->protocol == ATA_PROT_DMA ||
 949                 tf->protocol == ATAPI_PROT_DMA);
 950         ata_sff_tf_load(ap, tf);
 951 }
 952
 953
 954 static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
 955 {
 956         WARN_ON(tf->protocol == ATA_PROT_DMA ||
 957                 tf->protocol == ATAPI_PROT_DMA);
 958         ata_sff_exec_command(ap, tf);
 959 }
 960
 961
 962 static void pdc_sata_setup_port(struct ata_ioports *port, void __iomem *base)
 963 {
 964         port->cmd_addr          = base;
 965         port->data_addr         = base;
 966         port->feature_addr      =
 967         port->error_addr        = base + 0x4;
 968         port->nsect_addr        = base + 0x8;
 969         port->lbal_addr         = base + 0xc;
 970         port->lbam_addr         = base + 0x10;
 971         port->lbah_addr         = base + 0x14;
 972         port->device_addr       = base + 0x18;
 973         port->command_addr      =
 974         port->status_addr       = base + 0x1c;
 975         port->altstatus_addr    =
 976         port->ctl_addr          = base + 0x38;
 977 }
 978
 979
 980 #ifdef ATA_VERBOSE_DEBUG
 981 static void pdc20621_get_from_dimm(struct ata_host *host, void *psource,
 982                                    u32 offset, u32 size)
 983 {
 984         u32 window_size;
 985         u16 idx;
 986         u8 page_mask;
 987         long dist;
 988         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
 989         void __iomem *dimm_mmio = host->iomap[PDC_DIMM_BAR];
 990
 991         /* hard-code chip #0 */
 992         mmio += PDC_CHIP0_OFS;
 993
 994         page_mask = 0x00;
 995         window_size = 0x2000 * 4; /* 32K byte uchar size */
 996         idx = (u16) (offset / window_size);
 997
 998         writel(0x01, mmio + PDC_GENERAL_CTLR);
 999         readl(mmio + PDC_GENERAL_CTLR);
1000         writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
1001         readl(mmio + PDC_DIMM_WINDOW_CTLR);
1002
1003         offset -= (idx * window_size);
1004         idx++;
1005         dist = ((long) (window_size - (offset + size))) >= 0 ? size :
1006                 (long) (window_size - offset);
1007         memcpy_fromio(psource, dimm_mmio + offset / 4, dist);
1008
1009         psource += dist;
1010         size -= dist;
1011         for (; (long) size >= (long) window_size ;) {
1012                 writel(0x01, mmio + PDC_GENERAL_CTLR);
1013                 readl(mmio + PDC_GENERAL_CTLR);
1014                 writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
1015                 readl(mmio + PDC_DIMM_WINDOW_CTLR);
1016                 memcpy_fromio(psource, dimm_mmio, window_size / 4);
1017                 psource += window_size;
1018                 size -= window_size;
1019                 idx++;
1020         }
1021
1022         if (size) {
1023                 writel(0x01, mmio + PDC_GENERAL_CTLR);
1024                 readl(mmio + PDC_GENERAL_CTLR);
1025                 writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
1026                 readl(mmio + PDC_DIMM_WINDOW_CTLR);
1027                 memcpy_fromio(psource, dimm_mmio, size / 4);
1028         }
1029 }
1030 #endif
1031
1032
1033 static void pdc20621_put_to_dimm(struct ata_host *host, void *psource,
1034                                  u32 offset, u32 size)
1035 {
1036         u32 window_size;
1037         u16 idx;
1038         u8 page_mask;
1039         long dist;
1040         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1041         void __iomem *dimm_mmio = host->iomap[PDC_DIMM_BAR];
1042
1043         /* hard-code chip #0 */
1044         mmio += PDC_CHIP0_OFS;
1045
1046         page_mask = 0x00;
1047         window_size = 0x2000 * 4;       /* 32K byte uchar size */
1048         idx = (u16) (offset / window_size);
1049
1050         writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
1051         readl(mmio + PDC_DIMM_WINDOW_CTLR);
1052         offset -= (idx * window_size);
1053         idx++;
1054         dist = ((long)(s32)(window_size - (offset + size))) >= 0 ? size :
1055                 (long) (window_size - offset);
1056         memcpy_toio(dimm_mmio + offset / 4, psource, dist);
1057         writel(0x01, mmio + PDC_GENERAL_CTLR);
1058         readl(mmio + PDC_GENERAL_CTLR);
1059
1060         psource += dist;
1061         size -= dist;
1062         for (; (long) size >= (long) window_size ;) {
1063                 writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
1064                 readl(mmio + PDC_DIMM_WINDOW_CTLR);
1065                 memcpy_toio(dimm_mmio, psource, window_size / 4);
1066                 writel(0x01, mmio + PDC_GENERAL_CTLR);
1067                 readl(mmio + PDC_GENERAL_CTLR);
1068                 psource += window_size;
1069                 size -= window_size;
1070                 idx++;
1071         }
1072
1073         if (size) {
1074                 writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
1075                 readl(mmio + PDC_DIMM_WINDOW_CTLR);
1076                 memcpy_toio(dimm_mmio, psource, size / 4);
1077                 writel(0x01, mmio + PDC_GENERAL_CTLR);
1078                 readl(mmio + PDC_GENERAL_CTLR);
1079         }
1080 }
1081
1082
1083 static unsigned int pdc20621_i2c_read(struct ata_host *host, u32 device,
1084                                       u32 subaddr, u32 *pdata)
1085 {
1086         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1087         u32 i2creg  = 0;
1088         u32 status;
1089         u32 count = 0;
1090
1091         /* hard-code chip #0 */
1092         mmio += PDC_CHIP0_OFS;
1093
1094         i2creg |= device << 24;
1095         i2creg |= subaddr << 16;
1096
1097         /* Set the device and subaddress */
1098         writel(i2creg, mmio + PDC_I2C_ADDR_DATA);
1099         readl(mmio + PDC_I2C_ADDR_DATA);
1100
1101         /* Write Control to perform read operation, mask int */
1102         writel(PDC_I2C_READ | PDC_I2C_START | PDC_I2C_MASK_INT,
1103                mmio + PDC_I2C_CONTROL);
1104
1105         for (count = 0; count <= 1000; count ++) {
1106                 status = readl(mmio + PDC_I2C_CONTROL);
1107                 if (status & PDC_I2C_COMPLETE) {
1108                         status = readl(mmio + PDC_I2C_ADDR_DATA);
1109                         break;
1110                 } else if (count == 1000)
1111                         return 0;
1112         }
1113
1114         *pdata = (status >> 8) & 0x000000ff;
1115         return 1;
1116 }
1117
1118
1119 static int pdc20621_detect_dimm(struct ata_host *host)
1120 {
1121         u32 data = 0;
1122         if (pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
1123                              PDC_DIMM_SPD_SYSTEM_FREQ, &data)) {
1124                 if (data == 100)
1125                         return 100;
1126         } else
1127                 return 0;
1128
1129         if (pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS, 9, &data)) {
1130                 if (data <= 0x75)
1131                         return 133;
1132         } else
1133                 return 0;
1134
1135         return 0;
1136 }
1137
1138
1139 static int pdc20621_prog_dimm0(struct ata_host *host)
1140 {
1141         u32 spd0[50];
1142         u32 data = 0;
1143         int size, i;
1144         u8 bdimmsize;
1145         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1146         static const struct {
1147                 unsigned int reg;
1148                 unsigned int ofs;
1149         } pdc_i2c_read_data [] = {
1150                 { PDC_DIMM_SPD_TYPE, 11 },
1151                 { PDC_DIMM_SPD_FRESH_RATE, 12 },
1152                 { PDC_DIMM_SPD_COLUMN_NUM, 4 },
1153                 { PDC_DIMM_SPD_ATTRIBUTE, 21 },
1154                 { PDC_DIMM_SPD_ROW_NUM, 3 },
1155                 { PDC_DIMM_SPD_BANK_NUM, 17 },
1156                 { PDC_DIMM_SPD_MODULE_ROW, 5 },
1157                 { PDC_DIMM_SPD_ROW_PRE_CHARGE, 27 },
1158                 { PDC_DIMM_SPD_ROW_ACTIVE_DELAY, 28 },
1159                 { PDC_DIMM_SPD_RAS_CAS_DELAY, 29 },
1160                 { PDC_DIMM_SPD_ACTIVE_PRECHARGE, 30 },
1161                 { PDC_DIMM_SPD_CAS_LATENCY, 18 },
1162         };
1163
1164         /* hard-code chip #0 */
1165         mmio += PDC_CHIP0_OFS;
1166
1167         for (i = 0; i < ARRAY_SIZE(pdc_i2c_read_data); i++)
1168                 pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
1169                                   pdc_i2c_read_data[i].reg,
1170                                   &spd0[pdc_i2c_read_data[i].ofs]);
1171
1172         data |= (spd0[4] - 8) | ((spd0[21] != 0) << 3) | ((spd0[3]-11) << 4);
1173         data |= ((spd0[17] / 4) << 6) | ((spd0[5] / 2) << 7) |
1174                 ((((spd0[27] + 9) / 10) - 1) << 8) ;
1175         data |= (((((spd0[29] > spd0[28])
1176                     ? spd0[29] : spd0[28]) + 9) / 10) - 1) << 10;
1177         data |= ((spd0[30] - spd0[29] + 9) / 10 - 2) << 12;
1178
1179         if (spd0[18] & 0x08)
1180                 data |= ((0x03) << 14);
1181         else if (spd0[18] & 0x04)
1182                 data |= ((0x02) << 14);
1183         else if (spd0[18] & 0x01)
1184                 data |= ((0x01) << 14);
1185         else
1186                 data |= (0 << 14);
1187
1188         /*
1189            Calculate the size of bDIMMSize (power of 2) and
1190            merge the DIMM size by program start/end address.
1191         */
1192
1193         bdimmsize = spd0[4] + (spd0[5] / 2) + spd0[3] + (spd0[17] / 2) + 3;
1194         size = (1 << bdimmsize) >> 20;  /* size = xxx(MB) */
1195         data |= (((size / 16) - 1) << 16);
1196         data |= (0 << 23);
1197         data |= 8;
1198         writel(data, mmio + PDC_DIMM0_CONTROL);
1199         readl(mmio + PDC_DIMM0_CONTROL);
1200         return size;
1201 }
1202
1203
1204 static unsigned int pdc20621_prog_dimm_global(struct ata_host *host)
1205 {
1206         u32 data, spd0;
1207         int error, i;
1208         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1209
1210         /* hard-code chip #0 */
1211         mmio += PDC_CHIP0_OFS;
1212
1213         /*
1214           Set To Default : DIMM Module Global Control Register (0x022259F1)
1215           DIMM Arbitration Disable (bit 20)
1216           DIMM Data/Control Output Driving Selection (bit12 - bit15)
1217           Refresh Enable (bit 17)
1218         */
1219
1220         data = 0x022259F1;
1221         writel(data, mmio + PDC_SDRAM_CONTROL);
1222         readl(mmio + PDC_SDRAM_CONTROL);
1223
1224         /* Turn on for ECC */
1225         if (!pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
1226                                PDC_DIMM_SPD_TYPE, &spd0)) {
1227                 pr_err("Failed in i2c read: device=%#x, subaddr=%#x\n",
1228                        PDC_DIMM0_SPD_DEV_ADDRESS, PDC_DIMM_SPD_TYPE);
1229                 return 1;
1230         }
1231         if (spd0 == 0x02) {
1232                 data |= (0x01 << 16);
1233                 writel(data, mmio + PDC_SDRAM_CONTROL);
1234                 readl(mmio + PDC_SDRAM_CONTROL);
1235                 printk(KERN_ERR "Local DIMM ECC Enabled\n");
1236         }
1237
1238         /* DIMM Initialization Select/Enable (bit 18/19) */
1239         data &= (~(1<<18));
1240         data |= (1<<19);
1241         writel(data, mmio + PDC_SDRAM_CONTROL);
1242
1243         error = 1;
1244         for (i = 1; i <= 10; i++) {   /* polling ~5 secs */
1245                 data = readl(mmio + PDC_SDRAM_CONTROL);
1246                 if (!(data & (1<<19))) {
1247                         error = 0;
1248                         break;
1249                 }
1250                 msleep(i*100);
1251         }
1252         return error;
1253 }
1254
1255
1256 static unsigned int pdc20621_dimm_init(struct ata_host *host)
1257 {
1258         int speed, size, length;
1259         u32 addr, spd0, pci_status;
1260         u32 time_period = 0;
1261         u32 tcount = 0;
1262         u32 ticks = 0;
1263         u32 clock = 0;
1264         u32 fparam = 0;
1265         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1266
1267         /* hard-code chip #0 */
1268         mmio += PDC_CHIP0_OFS;
1269
1270         /* Initialize PLL based upon PCI Bus Frequency */
1271
1272         /* Initialize Time Period Register */
1273         writel(0xffffffff, mmio + PDC_TIME_PERIOD);
1274         time_period = readl(mmio + PDC_TIME_PERIOD);
1275         VPRINTK("Time Period Register (0x40): 0x%x\n", time_period);
1276
1277         /* Enable timer */
1278         writel(PDC_TIMER_DEFAULT, mmio + PDC_TIME_CONTROL);
1279         readl(mmio + PDC_TIME_CONTROL);
1280
1281         /* Wait 3 seconds */
1282         msleep(3000);
1283
1284         /*
1285            When timer is enabled, counter is decreased every internal
1286            clock cycle.
1287         */
1288
1289         tcount = readl(mmio + PDC_TIME_COUNTER);
1290         VPRINTK("Time Counter Register (0x44): 0x%x\n", tcount);
1291
1292         /*
1293            If SX4 is on PCI-X bus, after 3 seconds, the timer counter
1294            register should be >= (0xffffffff - 3x10^8).
1295         */
1296         if (tcount >= PCI_X_TCOUNT) {
1297                 ticks = (time_period - tcount);
1298                 VPRINTK("Num counters 0x%x (%d)\n", ticks, ticks);
1299
1300                 clock = (ticks / 300000);
1301                 VPRINTK("10 * Internal clk = 0x%x (%d)\n", clock, clock);
1302
1303                 clock = (clock * 33);
1304                 VPRINTK("10 * Internal clk * 33 = 0x%x (%d)\n", clock, clock);
1305
1306                 /* PLL F Param (bit 22:16) */
1307                 fparam = (1400000 / clock) - 2;
1308                 VPRINTK("PLL F Param: 0x%x (%d)\n", fparam, fparam);
1309
1310                 /* OD param = 0x2 (bit 31:30), R param = 0x5 (bit 29:25) */
1311                 pci_status = (0x8a001824 | (fparam << 16));
1312         } else
1313                 pci_status = PCI_PLL_INIT;
1314
1315         /* Initialize PLL. */
1316         VPRINTK("pci_status: 0x%x\n", pci_status);
1317         writel(pci_status, mmio + PDC_CTL_STATUS);
1318         readl(mmio + PDC_CTL_STATUS);
1319
1320         /*
1321            Read SPD of DIMM by I2C interface,
1322            and program the DIMM Module Controller.
1323         */
1324         if (!(speed = pdc20621_detect_dimm(host))) {
1325                 printk(KERN_ERR "Detect Local DIMM Fail\n");
1326                 return 1;       /* DIMM error */
1327         }
1328         VPRINTK("Local DIMM Speed = %d\n", speed);
1329
1330         /* Programming DIMM0 Module Control Register (index_CID0:80h) */
1331         size = pdc20621_prog_dimm0(host);
1332         VPRINTK("Local DIMM Size = %dMB\n", size);
1333
1334         /* Programming DIMM Module Global Control Register (index_CID0:88h) */
1335         if (pdc20621_prog_dimm_global(host)) {
1336                 printk(KERN_ERR "Programming DIMM Module Global Control Register Fail\n");
1337                 return 1;
1338         }
1339
1340 #ifdef ATA_VERBOSE_DEBUG
1341         {
1342                 u8 test_parttern1[40] =
1343                         {0x55,0xAA,'P','r','o','m','i','s','e',' ',
1344                         'N','o','t',' ','Y','e','t',' ',
1345                         'D','e','f','i','n','e','d',' ',
1346                         '1','.','1','0',
1347                         '9','8','0','3','1','6','1','2',0,0};
1348                 u8 test_parttern2[40] = {0};
1349
1350                 pdc20621_put_to_dimm(host, test_parttern2, 0x10040, 40);
1351                 pdc20621_put_to_dimm(host, test_parttern2, 0x40, 40);
1352
1353                 pdc20621_put_to_dimm(host, test_parttern1, 0x10040, 40);
1354                 pdc20621_get_from_dimm(host, test_parttern2, 0x40, 40);
1355                 printk(KERN_ERR "%x, %x, %s\n", test_parttern2[0],
1356                        test_parttern2[1], &(test_parttern2[2]));
1357                 pdc20621_get_from_dimm(host, test_parttern2, 0x10040,
1358                                        40);
1359                 printk(KERN_ERR "%x, %x, %s\n", test_parttern2[0],
1360                        test_parttern2[1], &(test_parttern2[2]));
1361
1362                 pdc20621_put_to_dimm(host, test_parttern1, 0x40, 40);
1363                 pdc20621_get_from_dimm(host, test_parttern2, 0x40, 40);
1364                 printk(KERN_ERR "%x, %x, %s\n", test_parttern2[0],
1365                        test_parttern2[1], &(test_parttern2[2]));
1366         }
1367 #endif
1368
1369         /* ECC initiliazation. */
1370
1371         if (!pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
1372                                PDC_DIMM_SPD_TYPE, &spd0)) {
1373                 pr_err("Failed in i2c read: device=%#x, subaddr=%#x\n",
1374                        PDC_DIMM0_SPD_DEV_ADDRESS, PDC_DIMM_SPD_TYPE);
1375                 return 1;
1376         }
1377         if (spd0 == 0x02) {
1378                 void *buf;
1379                 VPRINTK("Start ECC initialization\n");
1380                 addr = 0;
1381                 length = size * 1024 * 1024;
1382                 buf = kzalloc(ECC_ERASE_BUF_SZ, GFP_KERNEL);
1383                 if (!buf)
1384                         return 1;
1385                 while (addr < length) {
1386                         pdc20621_put_to_dimm(host, buf, addr,
1387                                              ECC_ERASE_BUF_SZ);
1388                         addr += ECC_ERASE_BUF_SZ;
1389                 }
1390                 kfree(buf);
1391                 VPRINTK("Finish ECC initialization\n");
1392         }
1393         return 0;
1394 }
1395
1396
1397 static void pdc_20621_init(struct ata_host *host)
1398 {
1399         u32 tmp;
1400         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1401
1402         /* hard-code chip #0 */
1403         mmio += PDC_CHIP0_OFS;
1404
1405         /*
1406          * Select page 0x40 for our 32k DIMM window
1407          */
1408         tmp = readl(mmio + PDC_20621_DIMM_WINDOW) & 0xffff0000;
1409         tmp |= PDC_PAGE_WINDOW; /* page 40h; arbitrarily selected */
1410         writel(tmp, mmio + PDC_20621_DIMM_WINDOW);
1411
1412         /*
1413          * Reset Host DMA
1414          */
1415         tmp = readl(mmio + PDC_HDMA_CTLSTAT);
1416         tmp |= PDC_RESET;
1417         writel(tmp, mmio + PDC_HDMA_CTLSTAT);
1418         readl(mmio + PDC_HDMA_CTLSTAT);         /* flush */
1419
1420         udelay(10);
1421
1422         tmp = readl(mmio + PDC_HDMA_CTLSTAT);
1423         tmp &= ~PDC_RESET;
1424         writel(tmp, mmio + PDC_HDMA_CTLSTAT);
1425         readl(mmio + PDC_HDMA_CTLSTAT);         /* flush */
1426 }
1427
1428 static int pdc_sata_init_one(struct pci_dev *pdev,
1429                              const struct pci_device_id *ent)
1430 {
1431         const struct ata_port_info *ppi[] =
1432                 { &pdc_port_info[ent->driver_data], NULL };
1433         struct ata_host *host;
1434         struct pdc_host_priv *hpriv;
1435         int i, rc;
1436
1437         ata_print_version_once(&pdev->dev, DRV_VERSION);
1438
1439         /* allocate host */
1440         host = ata_host_alloc_pinfo(&pdev->dev, ppi, 4);
1441         hpriv = devm_kzalloc(&pdev->dev, sizeof(*hpriv), GFP_KERNEL);
1442         if (!host || !hpriv)
1443                 return -ENOMEM;
1444
1445         host->private_data = hpriv;
1446
1447         /* acquire resources and fill host */
1448         rc = pcim_enable_device(pdev);
1449         if (rc)
1450                 return rc;
1451
1452         rc = pcim_iomap_regions(pdev, (1 << PDC_MMIO_BAR) | (1 << PDC_DIMM_BAR),
1453                                 DRV_NAME);
1454         if (rc == -EBUSY)
1455                 pcim_pin_device(pdev);
1456         if (rc)
1457                 return rc;
1458         host->iomap = pcim_iomap_table(pdev);
1459
1460         for (i = 0; i < 4; i++) {
1461                 struct ata_port *ap = host->ports[i];
1462                 void __iomem *base = host->iomap[PDC_MMIO_BAR] + PDC_CHIP0_OFS;
1463                 unsigned int offset = 0x200 + i * 0x80;
1464
1465                 pdc_sata_setup_port(&ap->ioaddr, base + offset);
1466
1467                 ata_port_pbar_desc(ap, PDC_MMIO_BAR, -1, "mmio");
1468                 ata_port_pbar_desc(ap, PDC_DIMM_BAR, -1, "dimm");
1469                 ata_port_pbar_desc(ap, PDC_MMIO_BAR, offset, "port");
1470         }
1471
1472         /* configure and activate */
1473         rc = dma_set_mask_and_coherent(&pdev->dev, ATA_DMA_MASK);
1474         if (rc)
1475                 return rc;
1476
1477         if (pdc20621_dimm_init(host))
1478                 return -ENOMEM;
1479         pdc_20621_init(host);
1480
1481         pci_set_master(pdev);
1482         return ata_host_activate(host, pdev->irq, pdc20621_interrupt,
1483                                  IRQF_SHARED, &pdc_sata_sht);
1484 }
1485
1486 module_pci_driver(pdc_sata_pci_driver);
1487
1488 MODULE_AUTHOR("Jeff Garzik");
1489 MODULE_DESCRIPTION("Promise SATA low-level driver");
1490 MODULE_LICENSE("GPL");
1491 MODULE_DEVICE_TABLE(pci, pdc_sata_pci_tbl);
1492 MODULE_VERSION(DRV_VERSION);