1 /* 2 * drivers/ata/pata_arasan_cf.c 3 * 4 * Arasan Compact Flash host controller source file 5 * 6 * Copyright (C) 2011 ST Microelectronics 7 * Viresh Kumar <vireshk@kernel.org> 8 * 9 * This file is licensed under the terms of the GNU General Public 10 * License version 2. This program is licensed "as is" without any 11 * warranty of any kind, whether express or implied. 12 */ 13 14 /* 15 * The Arasan CompactFlash Device Controller IP core has three basic modes of 16 * operation: PC card ATA using I/O mode, PC card ATA using memory mode, PC card 17 * ATA using true IDE modes. This driver supports only True IDE mode currently. 18 * 19 * Arasan CF Controller shares global irq register with Arasan XD Controller. 20 * 21 * Tested on arch/arm/mach-spear13xx 22 */ 23 24 #include <linux/ata.h> 25 #include <linux/clk.h> 26 #include <linux/completion.h> 27 #include <linux/delay.h> 28 #include <linux/dmaengine.h> 29 #include <linux/io.h> 30 #include <linux/irq.h> 31 #include <linux/kernel.h> 32 #include <linux/libata.h> 33 #include <linux/module.h> 34 #include <linux/of.h> 35 #include <linux/pata_arasan_cf_data.h> 36 #include <linux/platform_device.h> 37 #include <linux/pm.h> 38 #include <linux/slab.h> 39 #include <linux/spinlock.h> 40 #include <linux/types.h> 41 #include <linux/workqueue.h> 42 43 #define DRIVER_NAME "arasan_cf" 44 #define TIMEOUT msecs_to_jiffies(3000) 45 46 /* Registers */ 47 /* CompactFlash Interface Status */ 48 #define CFI_STS 0x000 49 #define STS_CHG (1) 50 #define BIN_AUDIO_OUT (1 << 1) 51 #define CARD_DETECT1 (1 << 2) 52 #define CARD_DETECT2 (1 << 3) 53 #define INP_ACK (1 << 4) 54 #define CARD_READY (1 << 5) 55 #define IO_READY (1 << 6) 56 #define B16_IO_PORT_SEL (1 << 7) 57 /* IRQ */ 58 #define IRQ_STS 0x004 59 /* Interrupt Enable */ 60 #define IRQ_EN 0x008 61 #define CARD_DETECT_IRQ (1) 62 #define STATUS_CHNG_IRQ (1 << 1) 63 #define MEM_MODE_IRQ (1 << 2) 64 #define IO_MODE_IRQ (1 << 3) 65 #define TRUE_IDE_MODE_IRQ (1 << 8) 66 #define PIO_XFER_ERR_IRQ (1 << 9) 67 #define BUF_AVAIL_IRQ (1 << 10) 68 #define XFER_DONE_IRQ (1 << 11) 69 #define IGNORED_IRQS (STATUS_CHNG_IRQ | MEM_MODE_IRQ | IO_MODE_IRQ |\ 70 TRUE_IDE_MODE_IRQ) 71 #define TRUE_IDE_IRQS (CARD_DETECT_IRQ | PIO_XFER_ERR_IRQ |\ 72 BUF_AVAIL_IRQ | XFER_DONE_IRQ) 73 /* Operation Mode */ 74 #define OP_MODE 0x00C 75 #define CARD_MODE_MASK (0x3) 76 #define MEM_MODE (0x0) 77 #define IO_MODE (0x1) 78 #define TRUE_IDE_MODE (0x2) 79 80 #define CARD_TYPE_MASK (1 << 2) 81 #define CF_CARD (0) 82 #define CF_PLUS_CARD (1 << 2) 83 84 #define CARD_RESET (1 << 3) 85 #define CFHOST_ENB (1 << 4) 86 #define OUTPUTS_TRISTATE (1 << 5) 87 #define ULTRA_DMA_ENB (1 << 8) 88 #define MULTI_WORD_DMA_ENB (1 << 9) 89 #define DRQ_BLOCK_SIZE_MASK (0x3 << 11) 90 #define DRQ_BLOCK_SIZE_512 (0) 91 #define DRQ_BLOCK_SIZE_1024 (1 << 11) 92 #define DRQ_BLOCK_SIZE_2048 (2 << 11) 93 #define DRQ_BLOCK_SIZE_4096 (3 << 11) 94 /* CF Interface Clock Configuration */ 95 #define CLK_CFG 0x010 96 #define CF_IF_CLK_MASK (0XF) 97 /* CF Timing Mode Configuration */ 98 #define TM_CFG 0x014 99 #define MEM_MODE_TIMING_MASK (0x3) 100 #define MEM_MODE_TIMING_250NS (0x0) 101 #define MEM_MODE_TIMING_120NS (0x1) 102 #define MEM_MODE_TIMING_100NS (0x2) 103 #define MEM_MODE_TIMING_80NS (0x3) 104 105 #define IO_MODE_TIMING_MASK (0x3 << 2) 106 #define IO_MODE_TIMING_250NS (0x0 << 2) 107 #define IO_MODE_TIMING_120NS (0x1 << 2) 108 #define IO_MODE_TIMING_100NS (0x2 << 2) 109 #define IO_MODE_TIMING_80NS (0x3 << 2) 110 111 #define TRUEIDE_PIO_TIMING_MASK (0x7 << 4) 112 #define TRUEIDE_PIO_TIMING_SHIFT 4 113 114 #define TRUEIDE_MWORD_DMA_TIMING_MASK (0x7 << 7) 115 #define TRUEIDE_MWORD_DMA_TIMING_SHIFT 7 116 117 #define ULTRA_DMA_TIMING_MASK (0x7 << 10) 118 #define ULTRA_DMA_TIMING_SHIFT 10 119 /* CF Transfer Address */ 120 #define XFER_ADDR 0x014 121 #define XFER_ADDR_MASK (0x7FF) 122 #define MAX_XFER_COUNT 0x20000u 123 /* Transfer Control */ 124 #define XFER_CTR 0x01C 125 #define XFER_COUNT_MASK (0x3FFFF) 126 #define ADDR_INC_DISABLE (1 << 24) 127 #define XFER_WIDTH_MASK (1 << 25) 128 #define XFER_WIDTH_8B (0) 129 #define XFER_WIDTH_16B (1 << 25) 130 131 #define MEM_TYPE_MASK (1 << 26) 132 #define MEM_TYPE_COMMON (0) 133 #define MEM_TYPE_ATTRIBUTE (1 << 26) 134 135 #define MEM_IO_XFER_MASK (1 << 27) 136 #define MEM_XFER (0) 137 #define IO_XFER (1 << 27) 138 139 #define DMA_XFER_MODE (1 << 28) 140 141 #define AHB_BUS_NORMAL_PIO_OPRTN (~(1 << 29)) 142 #define XFER_DIR_MASK (1 << 30) 143 #define XFER_READ (0) 144 #define XFER_WRITE (1 << 30) 145 146 #define XFER_START (1 << 31) 147 /* Write Data Port */ 148 #define WRITE_PORT 0x024 149 /* Read Data Port */ 150 #define READ_PORT 0x028 151 /* ATA Data Port */ 152 #define ATA_DATA_PORT 0x030 153 #define ATA_DATA_PORT_MASK (0xFFFF) 154 /* ATA Error/Features */ 155 #define ATA_ERR_FTR 0x034 156 /* ATA Sector Count */ 157 #define ATA_SC 0x038 158 /* ATA Sector Number */ 159 #define ATA_SN 0x03C 160 /* ATA Cylinder Low */ 161 #define ATA_CL 0x040 162 /* ATA Cylinder High */ 163 #define ATA_CH 0x044 164 /* ATA Select Card/Head */ 165 #define ATA_SH 0x048 166 /* ATA Status-Command */ 167 #define ATA_STS_CMD 0x04C 168 /* ATA Alternate Status/Device Control */ 169 #define ATA_ASTS_DCTR 0x050 170 /* Extended Write Data Port 0x200-0x3FC */ 171 #define EXT_WRITE_PORT 0x200 172 /* Extended Read Data Port 0x400-0x5FC */ 173 #define EXT_READ_PORT 0x400 174 #define FIFO_SIZE 0x200u 175 /* Global Interrupt Status */ 176 #define GIRQ_STS 0x800 177 /* Global Interrupt Status enable */ 178 #define GIRQ_STS_EN 0x804 179 /* Global Interrupt Signal enable */ 180 #define GIRQ_SGN_EN 0x808 181 #define GIRQ_CF (1) 182 #define GIRQ_XD (1 << 1) 183 184 /* Compact Flash Controller Dev Structure */ 185 struct arasan_cf_dev { 186 /* pointer to ata_host structure */ 187 struct ata_host *host; 188 /* clk structure */ 189 struct clk *clk; 190 191 /* physical base address of controller */ 192 dma_addr_t pbase; 193 /* virtual base address of controller */ 194 void __iomem *vbase; 195 /* irq number*/ 196 int irq; 197 198 /* status to be updated to framework regarding DMA transfer */ 199 u8 dma_status; 200 /* Card is present or Not */ 201 u8 card_present; 202 203 /* dma specific */ 204 /* Completion for transfer complete interrupt from controller */ 205 struct completion cf_completion; 206 /* Completion for DMA transfer complete. */ 207 struct completion dma_completion; 208 /* Dma channel allocated */ 209 struct dma_chan *dma_chan; 210 /* Mask for DMA transfers */ 211 dma_cap_mask_t mask; 212 /* DMA transfer work */ 213 struct work_struct work; 214 /* DMA delayed finish work */ 215 struct delayed_work dwork; 216 /* qc to be transferred using DMA */ 217 struct ata_queued_cmd *qc; 218 }; 219 220 static struct scsi_host_template arasan_cf_sht = { 221 ATA_BASE_SHT(DRIVER_NAME), 222 .sg_tablesize = SG_NONE, 223 .dma_boundary = 0xFFFFFFFFUL, 224 }; 225 226 static void cf_dumpregs(struct arasan_cf_dev *acdev) 227 { 228 struct device *dev = acdev->host->dev; 229 230 dev_dbg(dev, ": =========== REGISTER DUMP ==========="); 231 dev_dbg(dev, ": CFI_STS: %x", readl(acdev->vbase + CFI_STS)); 232 dev_dbg(dev, ": IRQ_STS: %x", readl(acdev->vbase + IRQ_STS)); 233 dev_dbg(dev, ": IRQ_EN: %x", readl(acdev->vbase + IRQ_EN)); 234 dev_dbg(dev, ": OP_MODE: %x", readl(acdev->vbase + OP_MODE)); 235 dev_dbg(dev, ": CLK_CFG: %x", readl(acdev->vbase + CLK_CFG)); 236 dev_dbg(dev, ": TM_CFG: %x", readl(acdev->vbase + TM_CFG)); 237 dev_dbg(dev, ": XFER_CTR: %x", readl(acdev->vbase + XFER_CTR)); 238 dev_dbg(dev, ": GIRQ_STS: %x", readl(acdev->vbase + GIRQ_STS)); 239 dev_dbg(dev, ": GIRQ_STS_EN: %x", readl(acdev->vbase + GIRQ_STS_EN)); 240 dev_dbg(dev, ": GIRQ_SGN_EN: %x", readl(acdev->vbase + GIRQ_SGN_EN)); 241 dev_dbg(dev, ": ====================================="); 242 } 243 244 /* Enable/Disable global interrupts shared between CF and XD ctrlr. */ 245 static void cf_ginterrupt_enable(struct arasan_cf_dev *acdev, bool enable) 246 { 247 /* enable should be 0 or 1 */ 248 writel(enable, acdev->vbase + GIRQ_STS_EN); 249 writel(enable, acdev->vbase + GIRQ_SGN_EN); 250 } 251 252 /* Enable/Disable CF interrupts */ 253 static inline void 254 cf_interrupt_enable(struct arasan_cf_dev *acdev, u32 mask, bool enable) 255 { 256 u32 val = readl(acdev->vbase + IRQ_EN); 257 /* clear & enable/disable irqs */ 258 if (enable) { 259 writel(mask, acdev->vbase + IRQ_STS); 260 writel(val | mask, acdev->vbase + IRQ_EN); 261 } else 262 writel(val & ~mask, acdev->vbase + IRQ_EN); 263 } 264 265 static inline void cf_card_reset(struct arasan_cf_dev *acdev) 266 { 267 u32 val = readl(acdev->vbase + OP_MODE); 268 269 writel(val | CARD_RESET, acdev->vbase + OP_MODE); 270 udelay(200); 271 writel(val & ~CARD_RESET, acdev->vbase + OP_MODE); 272 } 273 274 static inline void cf_ctrl_reset(struct arasan_cf_dev *acdev) 275 { 276 writel(readl(acdev->vbase + OP_MODE) & ~CFHOST_ENB, 277 acdev->vbase + OP_MODE); 278 writel(readl(acdev->vbase + OP_MODE) | CFHOST_ENB, 279 acdev->vbase + OP_MODE); 280 } 281 282 static void cf_card_detect(struct arasan_cf_dev *acdev, bool hotplugged) 283 { 284 struct ata_port *ap = acdev->host->ports[0]; 285 struct ata_eh_info *ehi = &ap->link.eh_info; 286 u32 val = readl(acdev->vbase + CFI_STS); 287 288 /* Both CD1 & CD2 should be low if card inserted completely */ 289 if (!(val & (CARD_DETECT1 | CARD_DETECT2))) { 290 if (acdev->card_present) 291 return; 292 acdev->card_present = 1; 293 cf_card_reset(acdev); 294 } else { 295 if (!acdev->card_present) 296 return; 297 acdev->card_present = 0; 298 } 299 300 if (hotplugged) { 301 ata_ehi_hotplugged(ehi); 302 ata_port_freeze(ap); 303 } 304 } 305 306 static int cf_init(struct arasan_cf_dev *acdev) 307 { 308 struct arasan_cf_pdata *pdata = dev_get_platdata(acdev->host->dev); 309 unsigned int if_clk; 310 unsigned long flags; 311 int ret = 0; 312 313 ret = clk_prepare_enable(acdev->clk); 314 if (ret) { 315 dev_dbg(acdev->host->dev, "clock enable failed"); 316 return ret; 317 } 318 319 ret = clk_set_rate(acdev->clk, 166000000); 320 if (ret) { 321 dev_warn(acdev->host->dev, "clock set rate failed"); 322 clk_disable_unprepare(acdev->clk); 323 return ret; 324 } 325 326 spin_lock_irqsave(&acdev->host->lock, flags); 327 /* configure CF interface clock */ 328 /* TODO: read from device tree */ 329 if_clk = CF_IF_CLK_166M; 330 if (pdata && pdata->cf_if_clk <= CF_IF_CLK_200M) 331 if_clk = pdata->cf_if_clk; 332 333 writel(if_clk, acdev->vbase + CLK_CFG); 334 335 writel(TRUE_IDE_MODE | CFHOST_ENB, acdev->vbase + OP_MODE); 336 cf_interrupt_enable(acdev, CARD_DETECT_IRQ, 1); 337 cf_ginterrupt_enable(acdev, 1); 338 spin_unlock_irqrestore(&acdev->host->lock, flags); 339 340 return ret; 341 } 342 343 static void cf_exit(struct arasan_cf_dev *acdev) 344 { 345 unsigned long flags; 346 347 spin_lock_irqsave(&acdev->host->lock, flags); 348 cf_ginterrupt_enable(acdev, 0); 349 cf_interrupt_enable(acdev, TRUE_IDE_IRQS, 0); 350 cf_card_reset(acdev); 351 writel(readl(acdev->vbase + OP_MODE) & ~CFHOST_ENB, 352 acdev->vbase + OP_MODE); 353 spin_unlock_irqrestore(&acdev->host->lock, flags); 354 clk_disable_unprepare(acdev->clk); 355 } 356 357 static void dma_callback(void *dev) 358 { 359 struct arasan_cf_dev *acdev = dev; 360 361 complete(&acdev->dma_completion); 362 } 363 364 static inline void dma_complete(struct arasan_cf_dev *acdev) 365 { 366 struct ata_queued_cmd *qc = acdev->qc; 367 unsigned long flags; 368 369 acdev->qc = NULL; 370 ata_sff_interrupt(acdev->irq, acdev->host); 371 372 spin_lock_irqsave(&acdev->host->lock, flags); 373 if (unlikely(qc->err_mask) && ata_is_dma(qc->tf.protocol)) 374 ata_ehi_push_desc(&qc->ap->link.eh_info, "DMA Failed: Timeout"); 375 spin_unlock_irqrestore(&acdev->host->lock, flags); 376 } 377 378 static inline int wait4buf(struct arasan_cf_dev *acdev) 379 { 380 if (!wait_for_completion_timeout(&acdev->cf_completion, TIMEOUT)) { 381 u32 rw = acdev->qc->tf.flags & ATA_TFLAG_WRITE; 382 383 dev_err(acdev->host->dev, "%s TimeOut", rw ? "write" : "read"); 384 return -ETIMEDOUT; 385 } 386 387 /* Check if PIO Error interrupt has occurred */ 388 if (acdev->dma_status & ATA_DMA_ERR) 389 return -EAGAIN; 390 391 return 0; 392 } 393 394 static int 395 dma_xfer(struct arasan_cf_dev *acdev, dma_addr_t src, dma_addr_t dest, u32 len) 396 { 397 struct dma_async_tx_descriptor *tx; 398 struct dma_chan *chan = acdev->dma_chan; 399 dma_cookie_t cookie; 400 unsigned long flags = DMA_PREP_INTERRUPT; 401 int ret = 0; 402 403 tx = chan->device->device_prep_dma_memcpy(chan, dest, src, len, flags); 404 if (!tx) { 405 dev_err(acdev->host->dev, "device_prep_dma_memcpy failed\n"); 406 return -EAGAIN; 407 } 408 409 tx->callback = dma_callback; 410 tx->callback_param = acdev; 411 cookie = tx->tx_submit(tx); 412 413 ret = dma_submit_error(cookie); 414 if (ret) { 415 dev_err(acdev->host->dev, "dma_submit_error\n"); 416 return ret; 417 } 418 419 chan->device->device_issue_pending(chan); 420 421 /* Wait for DMA to complete */ 422 if (!wait_for_completion_timeout(&acdev->dma_completion, TIMEOUT)) { 423 dmaengine_terminate_all(chan); 424 dev_err(acdev->host->dev, "wait_for_completion_timeout\n"); 425 return -ETIMEDOUT; 426 } 427 428 return ret; 429 } 430 431 static int sg_xfer(struct arasan_cf_dev *acdev, struct scatterlist *sg) 432 { 433 dma_addr_t dest = 0, src = 0; 434 u32 xfer_cnt, sglen, dma_len, xfer_ctr; 435 u32 write = acdev->qc->tf.flags & ATA_TFLAG_WRITE; 436 unsigned long flags; 437 int ret = 0; 438 439 sglen = sg_dma_len(sg); 440 if (write) { 441 src = sg_dma_address(sg); 442 dest = acdev->pbase + EXT_WRITE_PORT; 443 } else { 444 dest = sg_dma_address(sg); 445 src = acdev->pbase + EXT_READ_PORT; 446 } 447 448 /* 449 * For each sg: 450 * MAX_XFER_COUNT data will be transferred before we get transfer 451 * complete interrupt. Between after FIFO_SIZE data 452 * buffer available interrupt will be generated. At this time we will 453 * fill FIFO again: max FIFO_SIZE data. 454 */ 455 while (sglen) { 456 xfer_cnt = min(sglen, MAX_XFER_COUNT); 457 spin_lock_irqsave(&acdev->host->lock, flags); 458 xfer_ctr = readl(acdev->vbase + XFER_CTR) & 459 ~XFER_COUNT_MASK; 460 writel(xfer_ctr | xfer_cnt | XFER_START, 461 acdev->vbase + XFER_CTR); 462 spin_unlock_irqrestore(&acdev->host->lock, flags); 463 464 /* continue dma xfers until current sg is completed */ 465 while (xfer_cnt) { 466 /* wait for read to complete */ 467 if (!write) { 468 ret = wait4buf(acdev); 469 if (ret) 470 goto fail; 471 } 472 473 /* read/write FIFO in chunk of FIFO_SIZE */ 474 dma_len = min(xfer_cnt, FIFO_SIZE); 475 ret = dma_xfer(acdev, src, dest, dma_len); 476 if (ret) { 477 dev_err(acdev->host->dev, "dma failed"); 478 goto fail; 479 } 480 481 if (write) 482 src += dma_len; 483 else 484 dest += dma_len; 485 486 sglen -= dma_len; 487 xfer_cnt -= dma_len; 488 489 /* wait for write to complete */ 490 if (write) { 491 ret = wait4buf(acdev); 492 if (ret) 493 goto fail; 494 } 495 } 496 } 497 498 fail: 499 spin_lock_irqsave(&acdev->host->lock, flags); 500 writel(readl(acdev->vbase + XFER_CTR) & ~XFER_START, 501 acdev->vbase + XFER_CTR); 502 spin_unlock_irqrestore(&acdev->host->lock, flags); 503 504 return ret; 505 } 506 507 /* 508 * This routine uses External DMA controller to read/write data to FIFO of CF 509 * controller. There are two xfer related interrupt supported by CF controller: 510 * - buf_avail: This interrupt is generated as soon as we have buffer of 512 511 * bytes available for reading or empty buffer available for writing. 512 * - xfer_done: This interrupt is generated on transfer of "xfer_size" amount of 513 * data to/from FIFO. xfer_size is programmed in XFER_CTR register. 514 * 515 * Max buffer size = FIFO_SIZE = 512 Bytes. 516 * Max xfer_size = MAX_XFER_COUNT = 256 KB. 517 */ 518 static void data_xfer(struct work_struct *work) 519 { 520 struct arasan_cf_dev *acdev = container_of(work, struct arasan_cf_dev, 521 work); 522 struct ata_queued_cmd *qc = acdev->qc; 523 struct scatterlist *sg; 524 unsigned long flags; 525 u32 temp; 526 int ret = 0; 527 528 /* request dma channels */ 529 /* dma_request_channel may sleep, so calling from process context */ 530 acdev->dma_chan = dma_request_slave_channel(acdev->host->dev, "data"); 531 if (!acdev->dma_chan) { 532 dev_err(acdev->host->dev, "Unable to get dma_chan\n"); 533 goto chan_request_fail; 534 } 535 536 for_each_sg(qc->sg, sg, qc->n_elem, temp) { 537 ret = sg_xfer(acdev, sg); 538 if (ret) 539 break; 540 } 541 542 dma_release_channel(acdev->dma_chan); 543 544 /* data xferred successfully */ 545 if (!ret) { 546 u32 status; 547 548 spin_lock_irqsave(&acdev->host->lock, flags); 549 status = ioread8(qc->ap->ioaddr.altstatus_addr); 550 spin_unlock_irqrestore(&acdev->host->lock, flags); 551 if (status & (ATA_BUSY | ATA_DRQ)) { 552 ata_sff_queue_delayed_work(&acdev->dwork, 1); 553 return; 554 } 555 556 goto sff_intr; 557 } 558 559 cf_dumpregs(acdev); 560 561 chan_request_fail: 562 spin_lock_irqsave(&acdev->host->lock, flags); 563 /* error when transferring data to/from memory */ 564 qc->err_mask |= AC_ERR_HOST_BUS; 565 qc->ap->hsm_task_state = HSM_ST_ERR; 566 567 cf_ctrl_reset(acdev); 568 spin_unlock_irqrestore(&acdev->host->lock, flags); 569 sff_intr: 570 dma_complete(acdev); 571 } 572 573 static void delayed_finish(struct work_struct *work) 574 { 575 struct arasan_cf_dev *acdev = container_of(work, struct arasan_cf_dev, 576 dwork.work); 577 struct ata_queued_cmd *qc = acdev->qc; 578 unsigned long flags; 579 u8 status; 580 581 spin_lock_irqsave(&acdev->host->lock, flags); 582 status = ioread8(qc->ap->ioaddr.altstatus_addr); 583 spin_unlock_irqrestore(&acdev->host->lock, flags); 584 585 if (status & (ATA_BUSY | ATA_DRQ)) 586 ata_sff_queue_delayed_work(&acdev->dwork, 1); 587 else 588 dma_complete(acdev); 589 } 590 591 static irqreturn_t arasan_cf_interrupt(int irq, void *dev) 592 { 593 struct arasan_cf_dev *acdev = ((struct ata_host *)dev)->private_data; 594 unsigned long flags; 595 u32 irqsts; 596 597 irqsts = readl(acdev->vbase + GIRQ_STS); 598 if (!(irqsts & GIRQ_CF)) 599 return IRQ_NONE; 600 601 spin_lock_irqsave(&acdev->host->lock, flags); 602 irqsts = readl(acdev->vbase + IRQ_STS); 603 writel(irqsts, acdev->vbase + IRQ_STS); /* clear irqs */ 604 writel(GIRQ_CF, acdev->vbase + GIRQ_STS); /* clear girqs */ 605 606 /* handle only relevant interrupts */ 607 irqsts &= ~IGNORED_IRQS; 608 609 if (irqsts & CARD_DETECT_IRQ) { 610 cf_card_detect(acdev, 1); 611 spin_unlock_irqrestore(&acdev->host->lock, flags); 612 return IRQ_HANDLED; 613 } 614 615 if (irqsts & PIO_XFER_ERR_IRQ) { 616 acdev->dma_status = ATA_DMA_ERR; 617 writel(readl(acdev->vbase + XFER_CTR) & ~XFER_START, 618 acdev->vbase + XFER_CTR); 619 spin_unlock_irqrestore(&acdev->host->lock, flags); 620 complete(&acdev->cf_completion); 621 dev_err(acdev->host->dev, "pio xfer err irq\n"); 622 return IRQ_HANDLED; 623 } 624 625 spin_unlock_irqrestore(&acdev->host->lock, flags); 626 627 if (irqsts & BUF_AVAIL_IRQ) { 628 complete(&acdev->cf_completion); 629 return IRQ_HANDLED; 630 } 631 632 if (irqsts & XFER_DONE_IRQ) { 633 struct ata_queued_cmd *qc = acdev->qc; 634 635 /* Send Complete only for write */ 636 if (qc->tf.flags & ATA_TFLAG_WRITE) 637 complete(&acdev->cf_completion); 638 } 639 640 return IRQ_HANDLED; 641 } 642 643 static void arasan_cf_freeze(struct ata_port *ap) 644 { 645 struct arasan_cf_dev *acdev = ap->host->private_data; 646 647 /* stop transfer and reset controller */ 648 writel(readl(acdev->vbase + XFER_CTR) & ~XFER_START, 649 acdev->vbase + XFER_CTR); 650 cf_ctrl_reset(acdev); 651 acdev->dma_status = ATA_DMA_ERR; 652 653 ata_sff_dma_pause(ap); 654 ata_sff_freeze(ap); 655 } 656 657 static void arasan_cf_error_handler(struct ata_port *ap) 658 { 659 struct arasan_cf_dev *acdev = ap->host->private_data; 660 661 /* 662 * DMA transfers using an external DMA controller may be scheduled. 663 * Abort them before handling error. Refer data_xfer() for further 664 * details. 665 */ 666 cancel_work_sync(&acdev->work); 667 cancel_delayed_work_sync(&acdev->dwork); 668 return ata_sff_error_handler(ap); 669 } 670 671 static void arasan_cf_dma_start(struct arasan_cf_dev *acdev) 672 { 673 struct ata_queued_cmd *qc = acdev->qc; 674 struct ata_port *ap = qc->ap; 675 struct ata_taskfile *tf = &qc->tf; 676 u32 xfer_ctr = readl(acdev->vbase + XFER_CTR) & ~XFER_DIR_MASK; 677 u32 write = tf->flags & ATA_TFLAG_WRITE; 678 679 xfer_ctr |= write ? XFER_WRITE : XFER_READ; 680 writel(xfer_ctr, acdev->vbase + XFER_CTR); 681 682 ap->ops->sff_exec_command(ap, tf); 683 ata_sff_queue_work(&acdev->work); 684 } 685 686 static unsigned int arasan_cf_qc_issue(struct ata_queued_cmd *qc) 687 { 688 struct ata_port *ap = qc->ap; 689 struct arasan_cf_dev *acdev = ap->host->private_data; 690 691 /* defer PIO handling to sff_qc_issue */ 692 if (!ata_is_dma(qc->tf.protocol)) 693 return ata_sff_qc_issue(qc); 694 695 /* select the device */ 696 ata_wait_idle(ap); 697 ata_sff_dev_select(ap, qc->dev->devno); 698 ata_wait_idle(ap); 699 700 /* start the command */ 701 switch (qc->tf.protocol) { 702 case ATA_PROT_DMA: 703 WARN_ON_ONCE(qc->tf.flags & ATA_TFLAG_POLLING); 704 705 ap->ops->sff_tf_load(ap, &qc->tf); 706 acdev->dma_status = 0; 707 acdev->qc = qc; 708 arasan_cf_dma_start(acdev); 709 ap->hsm_task_state = HSM_ST_LAST; 710 break; 711 712 default: 713 WARN_ON(1); 714 return AC_ERR_SYSTEM; 715 } 716 717 return 0; 718 } 719 720 static void arasan_cf_set_piomode(struct ata_port *ap, struct ata_device *adev) 721 { 722 struct arasan_cf_dev *acdev = ap->host->private_data; 723 u8 pio = adev->pio_mode - XFER_PIO_0; 724 unsigned long flags; 725 u32 val; 726 727 /* Arasan ctrl supports Mode0 -> Mode6 */ 728 if (pio > 6) { 729 dev_err(ap->dev, "Unknown PIO mode\n"); 730 return; 731 } 732 733 spin_lock_irqsave(&acdev->host->lock, flags); 734 val = readl(acdev->vbase + OP_MODE) & 735 ~(ULTRA_DMA_ENB | MULTI_WORD_DMA_ENB | DRQ_BLOCK_SIZE_MASK); 736 writel(val, acdev->vbase + OP_MODE); 737 val = readl(acdev->vbase + TM_CFG) & ~TRUEIDE_PIO_TIMING_MASK; 738 val |= pio << TRUEIDE_PIO_TIMING_SHIFT; 739 writel(val, acdev->vbase + TM_CFG); 740 741 cf_interrupt_enable(acdev, BUF_AVAIL_IRQ | XFER_DONE_IRQ, 0); 742 cf_interrupt_enable(acdev, PIO_XFER_ERR_IRQ, 1); 743 spin_unlock_irqrestore(&acdev->host->lock, flags); 744 } 745 746 static void arasan_cf_set_dmamode(struct ata_port *ap, struct ata_device *adev) 747 { 748 struct arasan_cf_dev *acdev = ap->host->private_data; 749 u32 opmode, tmcfg, dma_mode = adev->dma_mode; 750 unsigned long flags; 751 752 spin_lock_irqsave(&acdev->host->lock, flags); 753 opmode = readl(acdev->vbase + OP_MODE) & 754 ~(MULTI_WORD_DMA_ENB | ULTRA_DMA_ENB); 755 tmcfg = readl(acdev->vbase + TM_CFG); 756 757 if ((dma_mode >= XFER_UDMA_0) && (dma_mode <= XFER_UDMA_6)) { 758 opmode |= ULTRA_DMA_ENB; 759 tmcfg &= ~ULTRA_DMA_TIMING_MASK; 760 tmcfg |= (dma_mode - XFER_UDMA_0) << ULTRA_DMA_TIMING_SHIFT; 761 } else if ((dma_mode >= XFER_MW_DMA_0) && (dma_mode <= XFER_MW_DMA_4)) { 762 opmode |= MULTI_WORD_DMA_ENB; 763 tmcfg &= ~TRUEIDE_MWORD_DMA_TIMING_MASK; 764 tmcfg |= (dma_mode - XFER_MW_DMA_0) << 765 TRUEIDE_MWORD_DMA_TIMING_SHIFT; 766 } else { 767 dev_err(ap->dev, "Unknown DMA mode\n"); 768 spin_unlock_irqrestore(&acdev->host->lock, flags); 769 return; 770 } 771 772 writel(opmode, acdev->vbase + OP_MODE); 773 writel(tmcfg, acdev->vbase + TM_CFG); 774 writel(DMA_XFER_MODE, acdev->vbase + XFER_CTR); 775 776 cf_interrupt_enable(acdev, PIO_XFER_ERR_IRQ, 0); 777 cf_interrupt_enable(acdev, BUF_AVAIL_IRQ | XFER_DONE_IRQ, 1); 778 spin_unlock_irqrestore(&acdev->host->lock, flags); 779 } 780 781 static struct ata_port_operations arasan_cf_ops = { 782 .inherits = &ata_sff_port_ops, 783 .freeze = arasan_cf_freeze, 784 .error_handler = arasan_cf_error_handler, 785 .qc_issue = arasan_cf_qc_issue, 786 .set_piomode = arasan_cf_set_piomode, 787 .set_dmamode = arasan_cf_set_dmamode, 788 }; 789 790 static int arasan_cf_probe(struct platform_device *pdev) 791 { 792 struct arasan_cf_dev *acdev; 793 struct arasan_cf_pdata *pdata = dev_get_platdata(&pdev->dev); 794 struct ata_host *host; 795 struct ata_port *ap; 796 struct resource *res; 797 u32 quirk; 798 irq_handler_t irq_handler = NULL; 799 int ret; 800 801 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 802 if (!res) 803 return -EINVAL; 804 805 if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res), 806 DRIVER_NAME)) { 807 dev_warn(&pdev->dev, "Failed to get memory region resource\n"); 808 return -ENOENT; 809 } 810 811 acdev = devm_kzalloc(&pdev->dev, sizeof(*acdev), GFP_KERNEL); 812 if (!acdev) 813 return -ENOMEM; 814 815 if (pdata) 816 quirk = pdata->quirk; 817 else 818 quirk = CF_BROKEN_UDMA; /* as it is on spear1340 */ 819 820 /* if irq is 0, support only PIO */ 821 acdev->irq = platform_get_irq(pdev, 0); 822 if (acdev->irq) 823 irq_handler = arasan_cf_interrupt; 824 else 825 quirk |= CF_BROKEN_MWDMA | CF_BROKEN_UDMA; 826 827 acdev->pbase = res->start; 828 acdev->vbase = devm_ioremap_nocache(&pdev->dev, res->start, 829 resource_size(res)); 830 if (!acdev->vbase) { 831 dev_warn(&pdev->dev, "ioremap fail\n"); 832 return -ENOMEM; 833 } 834 835 acdev->clk = devm_clk_get(&pdev->dev, NULL); 836 if (IS_ERR(acdev->clk)) { 837 dev_warn(&pdev->dev, "Clock not found\n"); 838 return PTR_ERR(acdev->clk); 839 } 840 841 /* allocate host */ 842 host = ata_host_alloc(&pdev->dev, 1); 843 if (!host) { 844 dev_warn(&pdev->dev, "alloc host fail\n"); 845 return -ENOMEM; 846 } 847 848 ap = host->ports[0]; 849 host->private_data = acdev; 850 acdev->host = host; 851 ap->ops = &arasan_cf_ops; 852 ap->pio_mask = ATA_PIO6; 853 ap->mwdma_mask = ATA_MWDMA4; 854 ap->udma_mask = ATA_UDMA6; 855 856 init_completion(&acdev->cf_completion); 857 init_completion(&acdev->dma_completion); 858 INIT_WORK(&acdev->work, data_xfer); 859 INIT_DELAYED_WORK(&acdev->dwork, delayed_finish); 860 dma_cap_set(DMA_MEMCPY, acdev->mask); 861 862 /* Handle platform specific quirks */ 863 if (quirk) { 864 if (quirk & CF_BROKEN_PIO) { 865 ap->ops->set_piomode = NULL; 866 ap->pio_mask = 0; 867 } 868 if (quirk & CF_BROKEN_MWDMA) 869 ap->mwdma_mask = 0; 870 if (quirk & CF_BROKEN_UDMA) 871 ap->udma_mask = 0; 872 } 873 ap->flags |= ATA_FLAG_PIO_POLLING | ATA_FLAG_NO_ATAPI; 874 875 ap->ioaddr.cmd_addr = acdev->vbase + ATA_DATA_PORT; 876 ap->ioaddr.data_addr = acdev->vbase + ATA_DATA_PORT; 877 ap->ioaddr.error_addr = acdev->vbase + ATA_ERR_FTR; 878 ap->ioaddr.feature_addr = acdev->vbase + ATA_ERR_FTR; 879 ap->ioaddr.nsect_addr = acdev->vbase + ATA_SC; 880 ap->ioaddr.lbal_addr = acdev->vbase + ATA_SN; 881 ap->ioaddr.lbam_addr = acdev->vbase + ATA_CL; 882 ap->ioaddr.lbah_addr = acdev->vbase + ATA_CH; 883 ap->ioaddr.device_addr = acdev->vbase + ATA_SH; 884 ap->ioaddr.status_addr = acdev->vbase + ATA_STS_CMD; 885 ap->ioaddr.command_addr = acdev->vbase + ATA_STS_CMD; 886 ap->ioaddr.altstatus_addr = acdev->vbase + ATA_ASTS_DCTR; 887 ap->ioaddr.ctl_addr = acdev->vbase + ATA_ASTS_DCTR; 888 889 ata_port_desc(ap, "phy_addr %llx virt_addr %p", 890 (unsigned long long) res->start, acdev->vbase); 891 892 ret = cf_init(acdev); 893 if (ret) 894 return ret; 895 896 cf_card_detect(acdev, 0); 897 898 ret = ata_host_activate(host, acdev->irq, irq_handler, 0, 899 &arasan_cf_sht); 900 if (!ret) 901 return 0; 902 903 cf_exit(acdev); 904 905 return ret; 906 } 907 908 static int arasan_cf_remove(struct platform_device *pdev) 909 { 910 struct ata_host *host = platform_get_drvdata(pdev); 911 struct arasan_cf_dev *acdev = host->ports[0]->private_data; 912 913 ata_host_detach(host); 914 cf_exit(acdev); 915 916 return 0; 917 } 918 919 #ifdef CONFIG_PM_SLEEP 920 static int arasan_cf_suspend(struct device *dev) 921 { 922 struct ata_host *host = dev_get_drvdata(dev); 923 struct arasan_cf_dev *acdev = host->ports[0]->private_data; 924 925 if (acdev->dma_chan) 926 dmaengine_terminate_all(acdev->dma_chan); 927 928 cf_exit(acdev); 929 return ata_host_suspend(host, PMSG_SUSPEND); 930 } 931 932 static int arasan_cf_resume(struct device *dev) 933 { 934 struct ata_host *host = dev_get_drvdata(dev); 935 struct arasan_cf_dev *acdev = host->ports[0]->private_data; 936 937 cf_init(acdev); 938 ata_host_resume(host); 939 940 return 0; 941 } 942 #endif 943 944 static SIMPLE_DEV_PM_OPS(arasan_cf_pm_ops, arasan_cf_suspend, arasan_cf_resume); 945 946 #ifdef CONFIG_OF 947 static const struct of_device_id arasan_cf_id_table[] = { 948 { .compatible = "arasan,cf-spear1340" }, 949 {} 950 }; 951 MODULE_DEVICE_TABLE(of, arasan_cf_id_table); 952 #endif 953 954 static struct platform_driver arasan_cf_driver = { 955 .probe = arasan_cf_probe, 956 .remove = arasan_cf_remove, 957 .driver = { 958 .name = DRIVER_NAME, 959 .pm = &arasan_cf_pm_ops, 960 .of_match_table = of_match_ptr(arasan_cf_id_table), 961 }, 962 }; 963 964 module_platform_driver(arasan_cf_driver); 965 966 MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>"); 967 MODULE_DESCRIPTION("Arasan ATA Compact Flash driver"); 968 MODULE_LICENSE("GPL"); 969 MODULE_ALIAS("platform:" DRIVER_NAME); 970