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 static int dimm_test;
  82 module_param(dimm_test, int, 0644);
  83 MODULE_PARM_DESC(dimm_test, "Enable DIMM test during startup (1 = enabled)");
  84
  85 enum {
  86         PDC_MMIO_BAR            = 3,
  87         PDC_DIMM_BAR            = 4,
  88
  89         PDC_PRD_TBL             = 0x44, /* Direct command DMA table addr */
  90
  91         PDC_PKT_SUBMIT          = 0x40, /* Command packet pointer addr */
  92         PDC_HDMA_PKT_SUBMIT     = 0x100, /* Host DMA packet pointer addr */
  93         PDC_INT_SEQMASK         = 0x40, /* Mask of asserted SEQ INTs */
  94         PDC_HDMA_CTLSTAT        = 0x12C, /* Host DMA control / status */
  95
  96         PDC_CTLSTAT             = 0x60, /* IDEn control / status */
  97
  98         PDC_20621_SEQCTL        = 0x400,
  99         PDC_20621_SEQMASK       = 0x480,
 100         PDC_20621_GENERAL_CTL   = 0x484,
 101         PDC_20621_PAGE_SIZE     = (32 * 1024),
 102
 103         /* chosen, not constant, values; we design our own DIMM mem map */
 104         PDC_20621_DIMM_WINDOW   = 0x0C, /* page# for 32K DIMM window */
 105         PDC_20621_DIMM_BASE     = 0x00200000,
 106         PDC_20621_DIMM_DATA     = (64 * 1024),
 107         PDC_DIMM_DATA_STEP      = (256 * 1024),
 108         PDC_DIMM_WINDOW_STEP    = (8 * 1024),
 109         PDC_DIMM_HOST_PRD       = (6 * 1024),
 110         PDC_DIMM_HOST_PKT       = (128 * 0),
 111         PDC_DIMM_HPKT_PRD       = (128 * 1),
 112         PDC_DIMM_ATA_PKT        = (128 * 2),
 113         PDC_DIMM_APKT_PRD       = (128 * 3),
 114         PDC_DIMM_HEADER_SZ      = PDC_DIMM_APKT_PRD + 128,
 115         PDC_PAGE_WINDOW         = 0x40,
 116         PDC_PAGE_DATA           = PDC_PAGE_WINDOW +
 117                                   (PDC_20621_DIMM_DATA / PDC_20621_PAGE_SIZE),
 118         PDC_PAGE_SET            = PDC_DIMM_DATA_STEP / PDC_20621_PAGE_SIZE,
 119
 120         PDC_CHIP0_OFS           = 0xC0000, /* offset of chip #0 */
 121
 122         PDC_20621_ERR_MASK      = (1<<19) | (1<<20) | (1<<21) | (1<<22) |
 123                                   (1<<23),
 124
 125         board_20621             = 0,    /* FastTrak S150 SX4 */
 126
 127         PDC_MASK_INT            = (1 << 10), /* HDMA/ATA mask int */
 128         PDC_RESET               = (1 << 11), /* HDMA/ATA reset */
 129         PDC_DMA_ENABLE          = (1 << 7),  /* DMA start/stop */
 130
 131         PDC_MAX_HDMA            = 32,
 132         PDC_HDMA_Q_MASK         = (PDC_MAX_HDMA - 1),
 133
 134         PDC_DIMM0_SPD_DEV_ADDRESS       = 0x50,
 135         PDC_DIMM1_SPD_DEV_ADDRESS       = 0x51,
 136         PDC_I2C_CONTROL                 = 0x48,
 137         PDC_I2C_ADDR_DATA               = 0x4C,
 138         PDC_DIMM0_CONTROL               = 0x80,
 139         PDC_DIMM1_CONTROL               = 0x84,
 140         PDC_SDRAM_CONTROL               = 0x88,
 141         PDC_I2C_WRITE                   = 0,            /* master -> slave */
 142         PDC_I2C_READ                    = (1 << 6),     /* master <- slave */
 143         PDC_I2C_START                   = (1 << 7),     /* start I2C proto */
 144         PDC_I2C_MASK_INT                = (1 << 5),     /* mask I2C interrupt */
 145         PDC_I2C_COMPLETE                = (1 << 16),    /* I2C normal compl. */
 146         PDC_I2C_NO_ACK                  = (1 << 20),    /* slave no-ack addr */
 147         PDC_DIMM_SPD_SUBADDRESS_START   = 0x00,
 148         PDC_DIMM_SPD_SUBADDRESS_END     = 0x7F,
 149         PDC_DIMM_SPD_ROW_NUM            = 3,
 150         PDC_DIMM_SPD_COLUMN_NUM         = 4,
 151         PDC_DIMM_SPD_MODULE_ROW         = 5,
 152         PDC_DIMM_SPD_TYPE               = 11,
 153         PDC_DIMM_SPD_FRESH_RATE         = 12,
 154         PDC_DIMM_SPD_BANK_NUM           = 17,
 155         PDC_DIMM_SPD_CAS_LATENCY        = 18,
 156         PDC_DIMM_SPD_ATTRIBUTE          = 21,
 157         PDC_DIMM_SPD_ROW_PRE_CHARGE     = 27,
 158         PDC_DIMM_SPD_ROW_ACTIVE_DELAY   = 28,
 159         PDC_DIMM_SPD_RAS_CAS_DELAY      = 29,
 160         PDC_DIMM_SPD_ACTIVE_PRECHARGE   = 30,
 161         PDC_DIMM_SPD_SYSTEM_FREQ        = 126,
 162         PDC_CTL_STATUS                  = 0x08,
 163         PDC_DIMM_WINDOW_CTLR            = 0x0C,
 164         PDC_TIME_CONTROL                = 0x3C,
 165         PDC_TIME_PERIOD                 = 0x40,
 166         PDC_TIME_COUNTER                = 0x44,
 167         PDC_GENERAL_CTLR                = 0x484,
 168         PCI_PLL_INIT                    = 0x8A531824,
 169         PCI_X_TCOUNT                    = 0xEE1E5CFF,
 170
 171         /* PDC_TIME_CONTROL bits */
 172         PDC_TIMER_BUZZER                = (1 << 10),
 173         PDC_TIMER_MODE_PERIODIC         = 0,            /* bits 9:8 == 00 */
 174         PDC_TIMER_MODE_ONCE             = (1 << 8),     /* bits 9:8 == 01 */
 175         PDC_TIMER_ENABLE                = (1 << 7),
 176         PDC_TIMER_MASK_INT              = (1 << 5),
 177         PDC_TIMER_SEQ_MASK              = 0x1f,         /* SEQ ID for timer */
 178         PDC_TIMER_DEFAULT               = PDC_TIMER_MODE_ONCE |
 179                                           PDC_TIMER_ENABLE |
 180                                           PDC_TIMER_MASK_INT,
 181 };
 182
 183 #define ECC_ERASE_BUF_SZ (128 * 1024)
 184
 185 struct pdc_port_priv {
 186         u8                      dimm_buf[(ATA_PRD_SZ * ATA_MAX_PRD) + 512];
 187         u8                      *pkt;
 188         dma_addr_t              pkt_dma;
 189 };
 190
 191 struct pdc_host_priv {
 192         unsigned int            doing_hdma;
 193         unsigned int            hdma_prod;
 194         unsigned int            hdma_cons;
 195         struct {
 196                 struct ata_queued_cmd *qc;
 197                 unsigned int    seq;
 198                 unsigned long   pkt_ofs;
 199         } hdma[32];
 200 };
 201
 202
 203 static int pdc_sata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
 204 static void pdc_error_handler(struct ata_port *ap);
 205 static void pdc_freeze(struct ata_port *ap);
 206 static void pdc_thaw(struct ata_port *ap);
 207 static int pdc_port_start(struct ata_port *ap);
 208 static enum ata_completion_errors pdc20621_qc_prep(struct ata_queued_cmd *qc);
 209 static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
 210 static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
 211 static unsigned int pdc20621_dimm_init(struct ata_host *host);
 212 static int pdc20621_detect_dimm(struct ata_host *host);
 213 static unsigned int pdc20621_i2c_read(struct ata_host *host,
 214                                       u32 device, u32 subaddr, u32 *pdata);
 215 static int pdc20621_prog_dimm0(struct ata_host *host);
 216 static unsigned int pdc20621_prog_dimm_global(struct ata_host *host);
 217 static void pdc20621_get_from_dimm(struct ata_host *host,
 218                                    void *psource, u32 offset, u32 size);
 219 static void pdc20621_put_to_dimm(struct ata_host *host,
 220                                  void *psource, u32 offset, u32 size);
 221 static void pdc20621_irq_clear(struct ata_port *ap);
 222 static unsigned int pdc20621_qc_issue(struct ata_queued_cmd *qc);
 223 static int pdc_softreset(struct ata_link *link, unsigned int *class,
 224                          unsigned long deadline);
 225 static void pdc_post_internal_cmd(struct ata_queued_cmd *qc);
 226 static int pdc_check_atapi_dma(struct ata_queued_cmd *qc);
 227
 228
 229 static const struct scsi_host_template pdc_sata_sht = {
 230         ATA_BASE_SHT(DRV_NAME),
 231         .sg_tablesize           = LIBATA_MAX_PRD,
 232         .dma_boundary           = ATA_DMA_BOUNDARY,
 233 };
 234
 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
 312         buf32[dw] = cpu_to_le32(addr);
 313         buf32[dw + 1] = cpu_to_le32(total_len | ATA_PRD_EOT);
 314 }
 315
 316 static inline void pdc20621_host_sg(u8 *buf, unsigned int portno,
 317                                     unsigned int total_len)
 318 {
 319         u32 addr;
 320         unsigned int dw = PDC_DIMM_HPKT_PRD >> 2;
 321         __le32 *buf32 = (__le32 *) buf;
 322
 323         /* output Host DMA packet S/G table */
 324         addr = PDC_20621_DIMM_BASE + PDC_20621_DIMM_DATA +
 325                (PDC_DIMM_DATA_STEP * portno);
 326
 327         buf32[dw] = cpu_to_le32(addr);
 328         buf32[dw + 1] = cpu_to_le32(total_len | ATA_PRD_EOT);
 329 }
 330
 331 static inline unsigned int pdc20621_ata_pkt(struct ata_taskfile *tf,
 332                                             unsigned int devno, u8 *buf,
 333                                             unsigned int portno)
 334 {
 335         unsigned int i, dw;
 336         __le32 *buf32 = (__le32 *) buf;
 337         u8 dev_reg;
 338
 339         unsigned int dimm_sg = PDC_20621_DIMM_BASE +
 340                                (PDC_DIMM_WINDOW_STEP * portno) +
 341                                PDC_DIMM_APKT_PRD;
 342
 343         i = PDC_DIMM_ATA_PKT;
 344
 345         /*
 346          * Set up ATA packet
 347          */
 348         if ((tf->protocol == ATA_PROT_DMA) && (!(tf->flags & ATA_TFLAG_WRITE)))
 349                 buf[i++] = PDC_PKT_READ;
 350         else if (tf->protocol == ATA_PROT_NODATA)
 351                 buf[i++] = PDC_PKT_NODATA;
 352         else
 353                 buf[i++] = 0;
 354         buf[i++] = 0;                   /* reserved */
 355         buf[i++] = portno + 1;          /* seq. id */
 356         buf[i++] = 0xff;                /* delay seq. id */
 357
 358         /* dimm dma S/G, and next-pkt */
 359         dw = i >> 2;
 360         if (tf->protocol == ATA_PROT_NODATA)
 361                 buf32[dw] = 0;
 362         else
 363                 buf32[dw] = cpu_to_le32(dimm_sg);
 364         buf32[dw + 1] = 0;
 365         i += 8;
 366
 367         if (devno == 0)
 368                 dev_reg = ATA_DEVICE_OBS;
 369         else
 370                 dev_reg = ATA_DEVICE_OBS | ATA_DEV1;
 371
 372         /* select device */
 373         buf[i++] = (1 << 5) | PDC_PKT_CLEAR_BSY | ATA_REG_DEVICE;
 374         buf[i++] = dev_reg;
 375
 376         /* device control register */
 377         buf[i++] = (1 << 5) | PDC_REG_DEVCTL;
 378         buf[i++] = tf->ctl;
 379
 380         return i;
 381 }
 382
 383 static inline void pdc20621_host_pkt(struct ata_taskfile *tf, u8 *buf,
 384                                      unsigned int portno)
 385 {
 386         unsigned int dw;
 387         u32 tmp;
 388         __le32 *buf32 = (__le32 *) buf;
 389
 390         unsigned int host_sg = PDC_20621_DIMM_BASE +
 391                                (PDC_DIMM_WINDOW_STEP * portno) +
 392                                PDC_DIMM_HOST_PRD;
 393         unsigned int dimm_sg = PDC_20621_DIMM_BASE +
 394                                (PDC_DIMM_WINDOW_STEP * portno) +
 395                                PDC_DIMM_HPKT_PRD;
 396
 397         dw = PDC_DIMM_HOST_PKT >> 2;
 398
 399         /*
 400          * Set up Host DMA packet
 401          */
 402         if ((tf->protocol == ATA_PROT_DMA) && (!(tf->flags & ATA_TFLAG_WRITE)))
 403                 tmp = PDC_PKT_READ;
 404         else
 405                 tmp = 0;
 406         tmp |= ((portno + 1 + 4) << 16);        /* seq. id */
 407         tmp |= (0xff << 24);                    /* delay seq. id */
 408         buf32[dw + 0] = cpu_to_le32(tmp);
 409         buf32[dw + 1] = cpu_to_le32(host_sg);
 410         buf32[dw + 2] = cpu_to_le32(dimm_sg);
 411         buf32[dw + 3] = 0;
 412 }
 413
 414 static void pdc20621_dma_prep(struct ata_queued_cmd *qc)
 415 {
 416         struct scatterlist *sg;
 417         struct ata_port *ap = qc->ap;
 418         struct pdc_port_priv *pp = ap->private_data;
 419         void __iomem *mmio = ap->host->iomap[PDC_MMIO_BAR];
 420         void __iomem *dimm_mmio = ap->host->iomap[PDC_DIMM_BAR];
 421         unsigned int portno = ap->port_no;
 422         unsigned int i, si, idx, total_len = 0, sgt_len;
 423         __le32 *buf = (__le32 *) &pp->dimm_buf[PDC_DIMM_HEADER_SZ];
 424
 425         WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
 426
 427         /* hard-code chip #0 */
 428         mmio += PDC_CHIP0_OFS;
 429
 430         /*
 431          * Build S/G table
 432          */
 433         idx = 0;
 434         for_each_sg(qc->sg, sg, qc->n_elem, si) {
 435                 buf[idx++] = cpu_to_le32(sg_dma_address(sg));
 436                 buf[idx++] = cpu_to_le32(sg_dma_len(sg));
 437                 total_len += sg_dma_len(sg);
 438         }
 439         buf[idx - 1] |= cpu_to_le32(ATA_PRD_EOT);
 440         sgt_len = idx * 4;
 441
 442         /*
 443          * Build ATA, host DMA packets
 444          */
 445         pdc20621_host_sg(&pp->dimm_buf[0], portno, total_len);
 446         pdc20621_host_pkt(&qc->tf, &pp->dimm_buf[0], portno);
 447
 448         pdc20621_ata_sg(&pp->dimm_buf[0], portno, total_len);
 449         i = pdc20621_ata_pkt(&qc->tf, qc->dev->devno, &pp->dimm_buf[0], portno);
 450
 451         if (qc->tf.flags & ATA_TFLAG_LBA48)
 452                 i = pdc_prep_lba48(&qc->tf, &pp->dimm_buf[0], i);
 453         else
 454                 i = pdc_prep_lba28(&qc->tf, &pp->dimm_buf[0], i);
 455
 456         pdc_pkt_footer(&qc->tf, &pp->dimm_buf[0], i);
 457
 458         /* copy three S/G tables and two packets to DIMM MMIO window */
 459         memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP),
 460                     &pp->dimm_buf, PDC_DIMM_HEADER_SZ);
 461         memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP) +
 462                     PDC_DIMM_HOST_PRD,
 463                     &pp->dimm_buf[PDC_DIMM_HEADER_SZ], sgt_len);
 464
 465         /* force host FIFO dump */
 466         writel(0x00000001, mmio + PDC_20621_GENERAL_CTL);
 467
 468         readl(dimm_mmio);       /* MMIO PCI posting flush */
 469
 470         ata_port_dbg(ap, "ata pkt buf ofs %u, prd size %u, mmio copied\n",
 471                      i, sgt_len);
 472 }
 473
 474 static void pdc20621_nodata_prep(struct ata_queued_cmd *qc)
 475 {
 476         struct ata_port *ap = qc->ap;
 477         struct pdc_port_priv *pp = ap->private_data;
 478         void __iomem *mmio = ap->host->iomap[PDC_MMIO_BAR];
 479         void __iomem *dimm_mmio = ap->host->iomap[PDC_DIMM_BAR];
 480         unsigned int portno = ap->port_no;
 481         unsigned int i;
 482
 483         /* hard-code chip #0 */
 484         mmio += PDC_CHIP0_OFS;
 485
 486         i = pdc20621_ata_pkt(&qc->tf, qc->dev->devno, &pp->dimm_buf[0], portno);
 487
 488         if (qc->tf.flags & ATA_TFLAG_LBA48)
 489                 i = pdc_prep_lba48(&qc->tf, &pp->dimm_buf[0], i);
 490         else
 491                 i = pdc_prep_lba28(&qc->tf, &pp->dimm_buf[0], i);
 492
 493         pdc_pkt_footer(&qc->tf, &pp->dimm_buf[0], i);
 494
 495         /* copy three S/G tables and two packets to DIMM MMIO window */
 496         memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP),
 497                     &pp->dimm_buf, PDC_DIMM_HEADER_SZ);
 498
 499         /* force host FIFO dump */
 500         writel(0x00000001, mmio + PDC_20621_GENERAL_CTL);
 501
 502         readl(dimm_mmio);       /* MMIO PCI posting flush */
 503
 504         ata_port_dbg(ap, "ata pkt buf ofs %u, mmio copied\n", i);
 505 }
 506
 507 static enum ata_completion_errors pdc20621_qc_prep(struct ata_queued_cmd *qc)
 508 {
 509         switch (qc->tf.protocol) {
 510         case ATA_PROT_DMA:
 511                 pdc20621_dma_prep(qc);
 512                 break;
 513         case ATA_PROT_NODATA:
 514                 pdc20621_nodata_prep(qc);
 515                 break;
 516         default:
 517                 break;
 518         }
 519
 520         return AC_ERR_OK;
 521 }
 522
 523 static void __pdc20621_push_hdma(struct ata_queued_cmd *qc,
 524                                  unsigned int seq,
 525                                  u32 pkt_ofs)
 526 {
 527         struct ata_port *ap = qc->ap;
 528         struct ata_host *host = ap->host;
 529         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
 530
 531         /* hard-code chip #0 */
 532         mmio += PDC_CHIP0_OFS;
 533
 534         writel(0x00000001, mmio + PDC_20621_SEQCTL + (seq * 4));
 535         readl(mmio + PDC_20621_SEQCTL + (seq * 4));     /* flush */
 536
 537         writel(pkt_ofs, mmio + PDC_HDMA_PKT_SUBMIT);
 538         readl(mmio + PDC_HDMA_PKT_SUBMIT);      /* flush */
 539 }
 540
 541 static void pdc20621_push_hdma(struct ata_queued_cmd *qc,
 542                                 unsigned int seq,
 543                                 u32 pkt_ofs)
 544 {
 545         struct ata_port *ap = qc->ap;
 546         struct pdc_host_priv *pp = ap->host->private_data;
 547         unsigned int idx = pp->hdma_prod & PDC_HDMA_Q_MASK;
 548
 549         if (!pp->doing_hdma) {
 550                 __pdc20621_push_hdma(qc, seq, pkt_ofs);
 551                 pp->doing_hdma = 1;
 552                 return;
 553         }
 554
 555         pp->hdma[idx].qc = qc;
 556         pp->hdma[idx].seq = seq;
 557         pp->hdma[idx].pkt_ofs = pkt_ofs;
 558         pp->hdma_prod++;
 559 }
 560
 561 static void pdc20621_pop_hdma(struct ata_queued_cmd *qc)
 562 {
 563         struct ata_port *ap = qc->ap;
 564         struct pdc_host_priv *pp = ap->host->private_data;
 565         unsigned int idx = pp->hdma_cons & PDC_HDMA_Q_MASK;
 566
 567         /* if nothing on queue, we're done */
 568         if (pp->hdma_prod == pp->hdma_cons) {
 569                 pp->doing_hdma = 0;
 570                 return;
 571         }
 572
 573         __pdc20621_push_hdma(pp->hdma[idx].qc, pp->hdma[idx].seq,
 574                              pp->hdma[idx].pkt_ofs);
 575         pp->hdma_cons++;
 576 }
 577
 578 static void pdc20621_dump_hdma(struct ata_queued_cmd *qc)
 579 {
 580         struct ata_port *ap = qc->ap;
 581         unsigned int port_no = ap->port_no;
 582         void __iomem *dimm_mmio = ap->host->iomap[PDC_DIMM_BAR];
 583
 584         dimm_mmio += (port_no * PDC_DIMM_WINDOW_STEP);
 585         dimm_mmio += PDC_DIMM_HOST_PKT;
 586
 587         ata_port_dbg(ap, "HDMA 0x%08X 0x%08X 0x%08X 0x%08X\n",
 588                      readl(dimm_mmio), readl(dimm_mmio + 4),
 589                      readl(dimm_mmio + 8), readl(dimm_mmio + 12));
 590 }
 591
 592 static void pdc20621_packet_start(struct ata_queued_cmd *qc)
 593 {
 594         struct ata_port *ap = qc->ap;
 595         struct ata_host *host = ap->host;
 596         unsigned int port_no = ap->port_no;
 597         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
 598         unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
 599         u8 seq = (u8) (port_no + 1);
 600         unsigned int port_ofs;
 601
 602         /* hard-code chip #0 */
 603         mmio += PDC_CHIP0_OFS;
 604
 605         wmb();                  /* flush PRD, pkt writes */
 606
 607         port_ofs = PDC_20621_DIMM_BASE + (PDC_DIMM_WINDOW_STEP * port_no);
 608
 609         /* if writing, we (1) DMA to DIMM, then (2) do ATA command */
 610         if (rw && qc->tf.protocol == ATA_PROT_DMA) {
 611                 seq += 4;
 612
 613                 pdc20621_dump_hdma(qc);
 614                 pdc20621_push_hdma(qc, seq, port_ofs + PDC_DIMM_HOST_PKT);
 615                 ata_port_dbg(ap, "queued ofs 0x%x (%u), seq %u\n",
 616                         port_ofs + PDC_DIMM_HOST_PKT,
 617                         port_ofs + PDC_DIMM_HOST_PKT,
 618                         seq);
 619         } else {
 620                 writel(0x00000001, mmio + PDC_20621_SEQCTL + (seq * 4));
 621                 readl(mmio + PDC_20621_SEQCTL + (seq * 4));     /* flush */
 622
 623                 writel(port_ofs + PDC_DIMM_ATA_PKT,
 624                        ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
 625                 readl(ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
 626                 ata_port_dbg(ap, "submitted ofs 0x%x (%u), seq %u\n",
 627                         port_ofs + PDC_DIMM_ATA_PKT,
 628                         port_ofs + PDC_DIMM_ATA_PKT,
 629                         seq);
 630         }
 631 }
 632
 633 static unsigned int pdc20621_qc_issue(struct ata_queued_cmd *qc)
 634 {
 635         switch (qc->tf.protocol) {
 636         case ATA_PROT_NODATA:
 637                 if (qc->tf.flags & ATA_TFLAG_POLLING)
 638                         break;
 639                 fallthrough;
 640         case ATA_PROT_DMA:
 641                 pdc20621_packet_start(qc);
 642                 return 0;
 643
 644         case ATAPI_PROT_DMA:
 645                 BUG();
 646                 break;
 647
 648         default:
 649                 break;
 650         }
 651
 652         return ata_sff_qc_issue(qc);
 653 }
 654
 655 static inline unsigned int pdc20621_host_intr(struct ata_port *ap,
 656                                           struct ata_queued_cmd *qc,
 657                                           unsigned int doing_hdma,
 658                                           void __iomem *mmio)
 659 {
 660         unsigned int port_no = ap->port_no;
 661         unsigned int port_ofs =
 662                 PDC_20621_DIMM_BASE + (PDC_DIMM_WINDOW_STEP * port_no);
 663         u8 status;
 664         unsigned int handled = 0;
 665
 666         if ((qc->tf.protocol == ATA_PROT_DMA) &&        /* read */
 667             (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
 668
 669                 /* step two - DMA from DIMM to host */
 670                 if (doing_hdma) {
 671                         ata_port_dbg(ap, "read hdma, 0x%x 0x%x\n",
 672                                 readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
 673                         /* get drive status; clear intr; complete txn */
 674                         qc->err_mask |= ac_err_mask(ata_wait_idle(ap));
 675                         ata_qc_complete(qc);
 676                         pdc20621_pop_hdma(qc);
 677                 }
 678
 679                 /* step one - exec ATA command */
 680                 else {
 681                         u8 seq = (u8) (port_no + 1 + 4);
 682                         ata_port_dbg(ap, "read ata, 0x%x 0x%x\n",
 683                                 readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
 684
 685                         /* submit hdma pkt */
 686                         pdc20621_dump_hdma(qc);
 687                         pdc20621_push_hdma(qc, seq,
 688                                            port_ofs + PDC_DIMM_HOST_PKT);
 689                 }
 690                 handled = 1;
 691
 692         } else if (qc->tf.protocol == ATA_PROT_DMA) {   /* write */
 693
 694                 /* step one - DMA from host to DIMM */
 695                 if (doing_hdma) {
 696                         u8 seq = (u8) (port_no + 1);
 697                         ata_port_dbg(ap, "write hdma, 0x%x 0x%x\n",
 698                                 readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
 699
 700                         /* submit ata pkt */
 701                         writel(0x00000001, mmio + PDC_20621_SEQCTL + (seq * 4));
 702                         readl(mmio + PDC_20621_SEQCTL + (seq * 4));
 703                         writel(port_ofs + PDC_DIMM_ATA_PKT,
 704                                ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
 705                         readl(ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
 706                 }
 707
 708                 /* step two - execute ATA command */
 709                 else {
 710                         ata_port_dbg(ap, "write ata, 0x%x 0x%x\n",
 711                                 readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
 712                         /* get drive status; clear intr; complete txn */
 713                         qc->err_mask |= ac_err_mask(ata_wait_idle(ap));
 714                         ata_qc_complete(qc);
 715                         pdc20621_pop_hdma(qc);
 716                 }
 717                 handled = 1;
 718
 719         /* command completion, but no data xfer */
 720         } else if (qc->tf.protocol == ATA_PROT_NODATA) {
 721
 722                 status = ata_sff_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
 723                 ata_port_dbg(ap, "BUS_NODATA (drv_stat 0x%X)\n", status);
 724                 qc->err_mask |= ac_err_mask(status);
 725                 ata_qc_complete(qc);
 726                 handled = 1;
 727
 728         } else {
 729                 ap->stats.idle_irq++;
 730         }
 731
 732         return handled;
 733 }
 734
 735 static void pdc20621_irq_clear(struct ata_port *ap)
 736 {
 737         ioread8(ap->ioaddr.status_addr);
 738 }
 739
 740 static irqreturn_t pdc20621_interrupt(int irq, void *dev_instance)
 741 {
 742         struct ata_host *host = dev_instance;
 743         struct ata_port *ap;
 744         u32 mask = 0;
 745         unsigned int i, tmp, port_no;
 746         unsigned int handled = 0;
 747         void __iomem *mmio_base;
 748
 749         if (!host || !host->iomap[PDC_MMIO_BAR])
 750                 return IRQ_NONE;
 751
 752         mmio_base = host->iomap[PDC_MMIO_BAR];
 753
 754         /* reading should also clear interrupts */
 755         mmio_base += PDC_CHIP0_OFS;
 756         mask = readl(mmio_base + PDC_20621_SEQMASK);
 757
 758         if (mask == 0xffffffff)
 759                 return IRQ_NONE;
 760
 761         mask &= 0xffff;         /* only 16 tags possible */
 762         if (!mask)
 763                 return IRQ_NONE;
 764
 765         spin_lock(&host->lock);
 766
 767         for (i = 1; i < 9; i++) {
 768                 port_no = i - 1;
 769                 if (port_no > 3)
 770                         port_no -= 4;
 771                 if (port_no >= host->n_ports)
 772                         ap = NULL;
 773                 else
 774                         ap = host->ports[port_no];
 775                 tmp = mask & (1 << i);
 776                 if (ap)
 777                         ata_port_dbg(ap, "seq %u, tmp %x\n", i, tmp);
 778                 if (tmp && ap) {
 779                         struct ata_queued_cmd *qc;
 780
 781                         qc = ata_qc_from_tag(ap, ap->link.active_tag);
 782                         if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
 783                                 handled += pdc20621_host_intr(ap, qc, (i > 4),
 784                                                               mmio_base);
 785                 }
 786         }
 787
 788         spin_unlock(&host->lock);
 789
 790         return IRQ_RETVAL(handled);
 791 }
 792
 793 static void pdc_freeze(struct ata_port *ap)
 794 {
 795         void __iomem *mmio = ap->ioaddr.cmd_addr;
 796         u32 tmp;
 797
 798         /* FIXME: if all 4 ATA engines are stopped, also stop HDMA engine */
 799
 800         tmp = readl(mmio + PDC_CTLSTAT);
 801         tmp |= PDC_MASK_INT;
 802         tmp &= ~PDC_DMA_ENABLE;
 803         writel(tmp, mmio + PDC_CTLSTAT);
 804         readl(mmio + PDC_CTLSTAT); /* flush */
 805 }
 806
 807 static void pdc_thaw(struct ata_port *ap)
 808 {
 809         void __iomem *mmio = ap->ioaddr.cmd_addr;
 810         u32 tmp;
 811
 812         /* FIXME: start HDMA engine, if zero ATA engines running */
 813
 814         /* clear IRQ */
 815         ioread8(ap->ioaddr.status_addr);
 816
 817         /* turn IRQ back on */
 818         tmp = readl(mmio + PDC_CTLSTAT);
 819         tmp &= ~PDC_MASK_INT;
 820         writel(tmp, mmio + PDC_CTLSTAT);
 821         readl(mmio + PDC_CTLSTAT); /* flush */
 822 }
 823
 824 static void pdc_reset_port(struct ata_port *ap)
 825 {
 826         void __iomem *mmio = ap->ioaddr.cmd_addr + PDC_CTLSTAT;
 827         unsigned int i;
 828         u32 tmp;
 829
 830         /* FIXME: handle HDMA copy engine */
 831
 832         for (i = 11; i > 0; i--) {
 833                 tmp = readl(mmio);
 834                 if (tmp & PDC_RESET)
 835                         break;
 836
 837                 udelay(100);
 838
 839                 tmp |= PDC_RESET;
 840                 writel(tmp, mmio);
 841         }
 842
 843         tmp &= ~PDC_RESET;
 844         writel(tmp, mmio);
 845         readl(mmio);    /* flush */
 846 }
 847
 848 static int pdc_softreset(struct ata_link *link, unsigned int *class,
 849                          unsigned long deadline)
 850 {
 851         pdc_reset_port(link->ap);
 852         return ata_sff_softreset(link, class, deadline);
 853 }
 854
 855 static void pdc_error_handler(struct ata_port *ap)
 856 {
 857         if (!ata_port_is_frozen(ap))
 858                 pdc_reset_port(ap);
 859
 860         ata_sff_error_handler(ap);
 861 }
 862
 863 static void pdc_post_internal_cmd(struct ata_queued_cmd *qc)
 864 {
 865         struct ata_port *ap = qc->ap;
 866
 867         /* make DMA engine forget about the failed command */
 868         if (qc->flags & ATA_QCFLAG_EH)
 869                 pdc_reset_port(ap);
 870 }
 871
 872 static int pdc_check_atapi_dma(struct ata_queued_cmd *qc)
 873 {
 874         u8 *scsicmd = qc->scsicmd->cmnd;
 875         int pio = 1; /* atapi dma off by default */
 876
 877         /* Whitelist commands that may use DMA. */
 878         switch (scsicmd[0]) {
 879         case WRITE_12:
 880         case WRITE_10:
 881         case WRITE_6:
 882         case READ_12:
 883         case READ_10:
 884         case READ_6:
 885         case 0xad: /* READ_DVD_STRUCTURE */
 886         case 0xbe: /* READ_CD */
 887                 pio = 0;
 888         }
 889         /* -45150 (FFFF4FA2) to -1 (FFFFFFFF) shall use PIO mode */
 890         if (scsicmd[0] == WRITE_10) {
 891                 unsigned int lba =
 892                         (scsicmd[2] << 24) |
 893                         (scsicmd[3] << 16) |
 894                         (scsicmd[4] << 8) |
 895                         scsicmd[5];
 896                 if (lba >= 0xFFFF4FA2)
 897                         pio = 1;
 898         }
 899         return pio;
 900 }
 901
 902 static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
 903 {
 904         WARN_ON(tf->protocol == ATA_PROT_DMA ||
 905                 tf->protocol == ATAPI_PROT_DMA);
 906         ata_sff_tf_load(ap, tf);
 907 }
 908
 909
 910 static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
 911 {
 912         WARN_ON(tf->protocol == ATA_PROT_DMA ||
 913                 tf->protocol == ATAPI_PROT_DMA);
 914         ata_sff_exec_command(ap, tf);
 915 }
 916
 917
 918 static void pdc_sata_setup_port(struct ata_ioports *port, void __iomem *base)
 919 {
 920         port->cmd_addr          = base;
 921         port->data_addr         = base;
 922         port->feature_addr      =
 923         port->error_addr        = base + 0x4;
 924         port->nsect_addr        = base + 0x8;
 925         port->lbal_addr         = base + 0xc;
 926         port->lbam_addr         = base + 0x10;
 927         port->lbah_addr         = base + 0x14;
 928         port->device_addr       = base + 0x18;
 929         port->command_addr      =
 930         port->status_addr       = base + 0x1c;
 931         port->altstatus_addr    =
 932         port->ctl_addr          = base + 0x38;
 933 }
 934
 935
 936 static void pdc20621_get_from_dimm(struct ata_host *host, void *psource,
 937                                    u32 offset, u32 size)
 938 {
 939         u32 window_size;
 940         u16 idx;
 941         u8 page_mask;
 942         long dist;
 943         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
 944         void __iomem *dimm_mmio = host->iomap[PDC_DIMM_BAR];
 945
 946         /* hard-code chip #0 */
 947         mmio += PDC_CHIP0_OFS;
 948
 949         page_mask = 0x00;
 950         window_size = 0x2000 * 4; /* 32K byte uchar size */
 951         idx = (u16) (offset / window_size);
 952
 953         writel(0x01, mmio + PDC_GENERAL_CTLR);
 954         readl(mmio + PDC_GENERAL_CTLR);
 955         writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
 956         readl(mmio + PDC_DIMM_WINDOW_CTLR);
 957
 958         offset -= (idx * window_size);
 959         idx++;
 960         dist = min(size, window_size - offset);
 961         memcpy_fromio(psource, dimm_mmio + offset / 4, dist);
 962
 963         psource += dist;
 964         size -= dist;
 965         for (; (long) size >= (long) window_size ;) {
 966                 writel(0x01, mmio + PDC_GENERAL_CTLR);
 967                 readl(mmio + PDC_GENERAL_CTLR);
 968                 writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
 969                 readl(mmio + PDC_DIMM_WINDOW_CTLR);
 970                 memcpy_fromio(psource, dimm_mmio, window_size / 4);
 971                 psource += window_size;
 972                 size -= window_size;
 973                 idx++;
 974         }
 975
 976         if (size) {
 977                 writel(0x01, mmio + PDC_GENERAL_CTLR);
 978                 readl(mmio + PDC_GENERAL_CTLR);
 979                 writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
 980                 readl(mmio + PDC_DIMM_WINDOW_CTLR);
 981                 memcpy_fromio(psource, dimm_mmio, size / 4);
 982         }
 983 }
 984
 985
 986 static void pdc20621_put_to_dimm(struct ata_host *host, void *psource,
 987                                  u32 offset, u32 size)
 988 {
 989         u32 window_size;
 990         u16 idx;
 991         u8 page_mask;
 992         long dist;
 993         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
 994         void __iomem *dimm_mmio = host->iomap[PDC_DIMM_BAR];
 995
 996         /* hard-code chip #0 */
 997         mmio += PDC_CHIP0_OFS;
 998
 999         page_mask = 0x00;
1000         window_size = 0x2000 * 4;       /* 32K byte uchar size */
1001         idx = (u16) (offset / window_size);
1002
1003         writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
1004         readl(mmio + PDC_DIMM_WINDOW_CTLR);
1005         offset -= (idx * window_size);
1006         idx++;
1007         dist = min(size, window_size - offset);
1008         memcpy_toio(dimm_mmio + offset / 4, psource, dist);
1009         writel(0x01, mmio + PDC_GENERAL_CTLR);
1010         readl(mmio + PDC_GENERAL_CTLR);
1011
1012         psource += dist;
1013         size -= dist;
1014         for (; (long) size >= (long) window_size ;) {
1015                 writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
1016                 readl(mmio + PDC_DIMM_WINDOW_CTLR);
1017                 memcpy_toio(dimm_mmio, psource, window_size / 4);
1018                 writel(0x01, mmio + PDC_GENERAL_CTLR);
1019                 readl(mmio + PDC_GENERAL_CTLR);
1020                 psource += window_size;
1021                 size -= window_size;
1022                 idx++;
1023         }
1024
1025         if (size) {
1026                 writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
1027                 readl(mmio + PDC_DIMM_WINDOW_CTLR);
1028                 memcpy_toio(dimm_mmio, psource, size / 4);
1029                 writel(0x01, mmio + PDC_GENERAL_CTLR);
1030                 readl(mmio + PDC_GENERAL_CTLR);
1031         }
1032 }
1033
1034
1035 static unsigned int pdc20621_i2c_read(struct ata_host *host, u32 device,
1036                                       u32 subaddr, u32 *pdata)
1037 {
1038         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1039         u32 i2creg  = 0;
1040         u32 status;
1041         u32 count = 0;
1042
1043         /* hard-code chip #0 */
1044         mmio += PDC_CHIP0_OFS;
1045
1046         i2creg |= device << 24;
1047         i2creg |= subaddr << 16;
1048
1049         /* Set the device and subaddress */
1050         writel(i2creg, mmio + PDC_I2C_ADDR_DATA);
1051         readl(mmio + PDC_I2C_ADDR_DATA);
1052
1053         /* Write Control to perform read operation, mask int */
1054         writel(PDC_I2C_READ | PDC_I2C_START | PDC_I2C_MASK_INT,
1055                mmio + PDC_I2C_CONTROL);
1056
1057         for (count = 0; count <= 1000; count ++) {
1058                 status = readl(mmio + PDC_I2C_CONTROL);
1059                 if (status & PDC_I2C_COMPLETE) {
1060                         status = readl(mmio + PDC_I2C_ADDR_DATA);
1061                         break;
1062                 } else if (count == 1000)
1063                         return 0;
1064         }
1065
1066         *pdata = (status >> 8) & 0x000000ff;
1067         return 1;
1068 }
1069
1070
1071 static int pdc20621_detect_dimm(struct ata_host *host)
1072 {
1073         u32 data = 0;
1074         if (pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
1075                              PDC_DIMM_SPD_SYSTEM_FREQ, &data)) {
1076                 if (data == 100)
1077                         return 100;
1078         } else
1079                 return 0;
1080
1081         if (pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS, 9, &data)) {
1082                 if (data <= 0x75)
1083                         return 133;
1084         } else
1085                 return 0;
1086
1087         return 0;
1088 }
1089
1090
1091 static int pdc20621_prog_dimm0(struct ata_host *host)
1092 {
1093         u32 spd0[50];
1094         u32 data = 0;
1095         int size, i;
1096         u8 bdimmsize;
1097         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1098         static const struct {
1099                 unsigned int reg;
1100                 unsigned int ofs;
1101         } pdc_i2c_read_data [] = {
1102                 { PDC_DIMM_SPD_TYPE, 11 },
1103                 { PDC_DIMM_SPD_FRESH_RATE, 12 },
1104                 { PDC_DIMM_SPD_COLUMN_NUM, 4 },
1105                 { PDC_DIMM_SPD_ATTRIBUTE, 21 },
1106                 { PDC_DIMM_SPD_ROW_NUM, 3 },
1107                 { PDC_DIMM_SPD_BANK_NUM, 17 },
1108                 { PDC_DIMM_SPD_MODULE_ROW, 5 },
1109                 { PDC_DIMM_SPD_ROW_PRE_CHARGE, 27 },
1110                 { PDC_DIMM_SPD_ROW_ACTIVE_DELAY, 28 },
1111                 { PDC_DIMM_SPD_RAS_CAS_DELAY, 29 },
1112                 { PDC_DIMM_SPD_ACTIVE_PRECHARGE, 30 },
1113                 { PDC_DIMM_SPD_CAS_LATENCY, 18 },
1114         };
1115
1116         /* hard-code chip #0 */
1117         mmio += PDC_CHIP0_OFS;
1118
1119         for (i = 0; i < ARRAY_SIZE(pdc_i2c_read_data); i++)
1120                 pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
1121                                   pdc_i2c_read_data[i].reg,
1122                                   &spd0[pdc_i2c_read_data[i].ofs]);
1123
1124         data |= (spd0[4] - 8) | ((spd0[21] != 0) << 3) | ((spd0[3]-11) << 4);
1125         data |= ((spd0[17] / 4) << 6) | ((spd0[5] / 2) << 7) |
1126                 ((((spd0[27] + 9) / 10) - 1) << 8) ;
1127         data |= (((((spd0[29] > spd0[28])
1128                     ? spd0[29] : spd0[28]) + 9) / 10) - 1) << 10;
1129         data |= ((spd0[30] - spd0[29] + 9) / 10 - 2) << 12;
1130
1131         if (spd0[18] & 0x08)
1132                 data |= ((0x03) << 14);
1133         else if (spd0[18] & 0x04)
1134                 data |= ((0x02) << 14);
1135         else if (spd0[18] & 0x01)
1136                 data |= ((0x01) << 14);
1137         else
1138                 data |= (0 << 14);
1139
1140         /*
1141            Calculate the size of bDIMMSize (power of 2) and
1142            merge the DIMM size by program start/end address.
1143         */
1144
1145         bdimmsize = spd0[4] + (spd0[5] / 2) + spd0[3] + (spd0[17] / 2) + 3;
1146         size = (1 << bdimmsize) >> 20;  /* size = xxx(MB) */
1147         data |= (((size / 16) - 1) << 16);
1148         data |= (0 << 23);
1149         data |= 8;
1150         writel(data, mmio + PDC_DIMM0_CONTROL);
1151         readl(mmio + PDC_DIMM0_CONTROL);
1152         return size;
1153 }
1154
1155
1156 static unsigned int pdc20621_prog_dimm_global(struct ata_host *host)
1157 {
1158         u32 data, spd0;
1159         int error, i;
1160         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1161
1162         /* hard-code chip #0 */
1163         mmio += PDC_CHIP0_OFS;
1164
1165         /*
1166           Set To Default : DIMM Module Global Control Register (0x022259F1)
1167           DIMM Arbitration Disable (bit 20)
1168           DIMM Data/Control Output Driving Selection (bit12 - bit15)
1169           Refresh Enable (bit 17)
1170         */
1171
1172         data = 0x022259F1;
1173         writel(data, mmio + PDC_SDRAM_CONTROL);
1174         readl(mmio + PDC_SDRAM_CONTROL);
1175
1176         /* Turn on for ECC */
1177         if (!pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
1178                                PDC_DIMM_SPD_TYPE, &spd0)) {
1179                 dev_err(host->dev,
1180                         "Failed in i2c read: device=%#x, subaddr=%#x\n",
1181                         PDC_DIMM0_SPD_DEV_ADDRESS, PDC_DIMM_SPD_TYPE);
1182                 return 1;
1183         }
1184         if (spd0 == 0x02) {
1185                 data |= (0x01 << 16);
1186                 writel(data, mmio + PDC_SDRAM_CONTROL);
1187                 readl(mmio + PDC_SDRAM_CONTROL);
1188                 dev_err(host->dev, "Local DIMM ECC Enabled\n");
1189         }
1190
1191         /* DIMM Initialization Select/Enable (bit 18/19) */
1192         data &= (~(1<<18));
1193         data |= (1<<19);
1194         writel(data, mmio + PDC_SDRAM_CONTROL);
1195
1196         error = 1;
1197         for (i = 1; i <= 10; i++) {   /* polling ~5 secs */
1198                 data = readl(mmio + PDC_SDRAM_CONTROL);
1199                 if (!(data & (1<<19))) {
1200                         error = 0;
1201                         break;
1202                 }
1203                 msleep(i*100);
1204         }
1205         return error;
1206 }
1207
1208
1209 static unsigned int pdc20621_dimm_init(struct ata_host *host)
1210 {
1211         int speed, size, length;
1212         u32 addr, spd0, pci_status;
1213         u32 time_period = 0;
1214         u32 tcount = 0;
1215         u32 ticks = 0;
1216         u32 clock = 0;
1217         u32 fparam = 0;
1218         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1219
1220         /* hard-code chip #0 */
1221         mmio += PDC_CHIP0_OFS;
1222
1223         /* Initialize PLL based upon PCI Bus Frequency */
1224
1225         /* Initialize Time Period Register */
1226         writel(0xffffffff, mmio + PDC_TIME_PERIOD);
1227         time_period = readl(mmio + PDC_TIME_PERIOD);
1228         dev_dbg(host->dev, "Time Period Register (0x40): 0x%x\n", time_period);
1229
1230         /* Enable timer */
1231         writel(PDC_TIMER_DEFAULT, mmio + PDC_TIME_CONTROL);
1232         readl(mmio + PDC_TIME_CONTROL);
1233
1234         /* Wait 3 seconds */
1235         msleep(3000);
1236
1237         /*
1238            When timer is enabled, counter is decreased every internal
1239            clock cycle.
1240         */
1241
1242         tcount = readl(mmio + PDC_TIME_COUNTER);
1243         dev_dbg(host->dev, "Time Counter Register (0x44): 0x%x\n", tcount);
1244
1245         /*
1246            If SX4 is on PCI-X bus, after 3 seconds, the timer counter
1247            register should be >= (0xffffffff - 3x10^8).
1248         */
1249         if (tcount >= PCI_X_TCOUNT) {
1250                 ticks = (time_period - tcount);
1251                 dev_dbg(host->dev, "Num counters 0x%x (%d)\n", ticks, ticks);
1252
1253                 clock = (ticks / 300000);
1254                 dev_dbg(host->dev, "10 * Internal clk = 0x%x (%d)\n",
1255                         clock, clock);
1256
1257                 clock = (clock * 33);
1258                 dev_dbg(host->dev, "10 * Internal clk * 33 = 0x%x (%d)\n",
1259                         clock, clock);
1260
1261                 /* PLL F Param (bit 22:16) */
1262                 fparam = (1400000 / clock) - 2;
1263                 dev_dbg(host->dev, "PLL F Param: 0x%x (%d)\n", fparam, fparam);
1264
1265                 /* OD param = 0x2 (bit 31:30), R param = 0x5 (bit 29:25) */
1266                 pci_status = (0x8a001824 | (fparam << 16));
1267         } else
1268                 pci_status = PCI_PLL_INIT;
1269
1270         /* Initialize PLL. */
1271         dev_dbg(host->dev, "pci_status: 0x%x\n", pci_status);
1272         writel(pci_status, mmio + PDC_CTL_STATUS);
1273         readl(mmio + PDC_CTL_STATUS);
1274
1275         /*
1276            Read SPD of DIMM by I2C interface,
1277            and program the DIMM Module Controller.
1278         */
1279         if (!(speed = pdc20621_detect_dimm(host))) {
1280                 dev_err(host->dev, "Detect Local DIMM Fail\n");
1281                 return 1;       /* DIMM error */
1282         }
1283         dev_dbg(host->dev, "Local DIMM Speed = %d\n", speed);
1284
1285         /* Programming DIMM0 Module Control Register (index_CID0:80h) */
1286         size = pdc20621_prog_dimm0(host);
1287         dev_dbg(host->dev, "Local DIMM Size = %dMB\n", size);
1288
1289         /* Programming DIMM Module Global Control Register (index_CID0:88h) */
1290         if (pdc20621_prog_dimm_global(host)) {
1291                 dev_err(host->dev,
1292                         "Programming DIMM Module Global Control Register Fail\n");
1293                 return 1;
1294         }
1295
1296         if (dimm_test) {
1297                 u8 test_parttern1[40] =
1298                         {0x55,0xAA,'P','r','o','m','i','s','e',' ',
1299                         'N','o','t',' ','Y','e','t',' ',
1300                         'D','e','f','i','n','e','d',' ',
1301                         '1','.','1','0',
1302                         '9','8','0','3','1','6','1','2',0,0};
1303                 u8 test_parttern2[40] = {0};
1304
1305                 pdc20621_put_to_dimm(host, test_parttern2, 0x10040, 40);
1306                 pdc20621_put_to_dimm(host, test_parttern2, 0x40, 40);
1307
1308                 pdc20621_put_to_dimm(host, test_parttern1, 0x10040, 40);
1309                 pdc20621_get_from_dimm(host, test_parttern2, 0x40, 40);
1310                 dev_info(host->dev, "DIMM test pattern 1: %x, %x, %s\n", test_parttern2[0],
1311                        test_parttern2[1], &(test_parttern2[2]));
1312                 pdc20621_get_from_dimm(host, test_parttern2, 0x10040,
1313                                        40);
1314                 dev_info(host->dev, "DIMM test pattern 2: %x, %x, %s\n",
1315                          test_parttern2[0],
1316                          test_parttern2[1], &(test_parttern2[2]));
1317
1318                 pdc20621_put_to_dimm(host, test_parttern1, 0x40, 40);
1319                 pdc20621_get_from_dimm(host, test_parttern2, 0x40, 40);
1320                 dev_info(host->dev, "DIMM test pattern 3: %x, %x, %s\n",
1321                          test_parttern2[0],
1322                          test_parttern2[1], &(test_parttern2[2]));
1323         }
1324
1325         /* ECC initiliazation. */
1326
1327         if (!pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
1328                                PDC_DIMM_SPD_TYPE, &spd0)) {
1329                 dev_err(host->dev,
1330                         "Failed in i2c read: device=%#x, subaddr=%#x\n",
1331                        PDC_DIMM0_SPD_DEV_ADDRESS, PDC_DIMM_SPD_TYPE);
1332                 return 1;
1333         }
1334         if (spd0 == 0x02) {
1335                 void *buf;
1336                 dev_dbg(host->dev, "Start ECC initialization\n");
1337                 addr = 0;
1338                 length = size * 1024 * 1024;
1339                 buf = kzalloc(ECC_ERASE_BUF_SZ, GFP_KERNEL);
1340                 if (!buf)
1341                         return 1;
1342                 while (addr < length) {
1343                         pdc20621_put_to_dimm(host, buf, addr,
1344                                              ECC_ERASE_BUF_SZ);
1345                         addr += ECC_ERASE_BUF_SZ;
1346                 }
1347                 kfree(buf);
1348                 dev_dbg(host->dev, "Finish ECC initialization\n");
1349         }
1350         return 0;
1351 }
1352
1353
1354 static void pdc_20621_init(struct ata_host *host)
1355 {
1356         u32 tmp;
1357         void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
1358
1359         /* hard-code chip #0 */
1360         mmio += PDC_CHIP0_OFS;
1361
1362         /*
1363          * Select page 0x40 for our 32k DIMM window
1364          */
1365         tmp = readl(mmio + PDC_20621_DIMM_WINDOW) & 0xffff0000;
1366         tmp |= PDC_PAGE_WINDOW; /* page 40h; arbitrarily selected */
1367         writel(tmp, mmio + PDC_20621_DIMM_WINDOW);
1368
1369         /*
1370          * Reset Host DMA
1371          */
1372         tmp = readl(mmio + PDC_HDMA_CTLSTAT);
1373         tmp |= PDC_RESET;
1374         writel(tmp, mmio + PDC_HDMA_CTLSTAT);
1375         readl(mmio + PDC_HDMA_CTLSTAT);         /* flush */
1376
1377         udelay(10);
1378
1379         tmp = readl(mmio + PDC_HDMA_CTLSTAT);
1380         tmp &= ~PDC_RESET;
1381         writel(tmp, mmio + PDC_HDMA_CTLSTAT);
1382         readl(mmio + PDC_HDMA_CTLSTAT);         /* flush */
1383 }
1384
1385 static int pdc_sata_init_one(struct pci_dev *pdev,
1386                              const struct pci_device_id *ent)
1387 {
1388         const struct ata_port_info *ppi[] =
1389                 { &pdc_port_info[ent->driver_data], NULL };
1390         struct ata_host *host;
1391         struct pdc_host_priv *hpriv;
1392         int i, rc;
1393
1394         ata_print_version_once(&pdev->dev, DRV_VERSION);
1395
1396         /* allocate host */
1397         host = ata_host_alloc_pinfo(&pdev->dev, ppi, 4);
1398         hpriv = devm_kzalloc(&pdev->dev, sizeof(*hpriv), GFP_KERNEL);
1399         if (!host || !hpriv)
1400                 return -ENOMEM;
1401
1402         host->private_data = hpriv;
1403
1404         /* acquire resources and fill host */
1405         rc = pcim_enable_device(pdev);
1406         if (rc)
1407                 return rc;
1408
1409         rc = pcim_iomap_regions(pdev, (1 << PDC_MMIO_BAR) | (1 << PDC_DIMM_BAR),
1410                                 DRV_NAME);
1411         if (rc == -EBUSY)
1412                 pcim_pin_device(pdev);
1413         if (rc)
1414                 return rc;
1415         host->iomap = pcim_iomap_table(pdev);
1416
1417         for (i = 0; i < 4; i++) {
1418                 struct ata_port *ap = host->ports[i];
1419                 void __iomem *base = host->iomap[PDC_MMIO_BAR] + PDC_CHIP0_OFS;
1420                 unsigned int offset = 0x200 + i * 0x80;
1421
1422                 pdc_sata_setup_port(&ap->ioaddr, base + offset);
1423
1424                 ata_port_pbar_desc(ap, PDC_MMIO_BAR, -1, "mmio");
1425                 ata_port_pbar_desc(ap, PDC_DIMM_BAR, -1, "dimm");
1426                 ata_port_pbar_desc(ap, PDC_MMIO_BAR, offset, "port");
1427         }
1428
1429         /* configure and activate */
1430         rc = dma_set_mask_and_coherent(&pdev->dev, ATA_DMA_MASK);
1431         if (rc)
1432                 return rc;
1433
1434         if (pdc20621_dimm_init(host))
1435                 return -ENOMEM;
1436         pdc_20621_init(host);
1437
1438         pci_set_master(pdev);
1439         return ata_host_activate(host, pdev->irq, pdc20621_interrupt,
1440                                  IRQF_SHARED, &pdc_sata_sht);
1441 }
1442
1443 module_pci_driver(pdc_sata_pci_driver);
1444
1445 MODULE_AUTHOR("Jeff Garzik");
1446 MODULE_DESCRIPTION("Promise SATA low-level driver");
1447 MODULE_LICENSE("GPL");
1448 MODULE_DEVICE_TABLE(pci, pdc_sata_pci_tbl);
1449 MODULE_VERSION(DRV_VERSION);