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 #include <trace/events/libata.h> 43 44 #define DRIVER_NAME "arasan_cf" 45 #define TIMEOUT msecs_to_jiffies(3000) 46 47 /* Registers */ 48 /* CompactFlash Interface Status */ 49 #define CFI_STS 0x000 50 #define STS_CHG (1) 51 #define BIN_AUDIO_OUT (1 << 1) 52 #define CARD_DETECT1 (1 << 2) 53 #define CARD_DETECT2 (1 << 3) 54 #define INP_ACK (1 << 4) 55 #define CARD_READY (1 << 5) 56 #define IO_READY (1 << 6) 57 #define B16_IO_PORT_SEL (1 << 7) 58 /* IRQ */ 59 #define IRQ_STS 0x004 60 /* Interrupt Enable */ 61 #define IRQ_EN 0x008 62 #define CARD_DETECT_IRQ (1) 63 #define STATUS_CHNG_IRQ (1 << 1) 64 #define MEM_MODE_IRQ (1 << 2) 65 #define IO_MODE_IRQ (1 << 3) 66 #define TRUE_IDE_MODE_IRQ (1 << 8) 67 #define PIO_XFER_ERR_IRQ (1 << 9) 68 #define BUF_AVAIL_IRQ (1 << 10) 69 #define XFER_DONE_IRQ (1 << 11) 70 #define IGNORED_IRQS (STATUS_CHNG_IRQ | MEM_MODE_IRQ | IO_MODE_IRQ |\ 71 TRUE_IDE_MODE_IRQ) 72 #define TRUE_IDE_IRQS (CARD_DETECT_IRQ | PIO_XFER_ERR_IRQ |\ 73 BUF_AVAIL_IRQ | XFER_DONE_IRQ) 74 /* Operation Mode */ 75 #define OP_MODE 0x00C 76 #define CARD_MODE_MASK (0x3) 77 #define MEM_MODE (0x0) 78 #define IO_MODE (0x1) 79 #define TRUE_IDE_MODE (0x2) 80 81 #define CARD_TYPE_MASK (1 << 2) 82 #define CF_CARD (0) 83 #define CF_PLUS_CARD (1 << 2) 84 85 #define CARD_RESET (1 << 3) 86 #define CFHOST_ENB (1 << 4) 87 #define OUTPUTS_TRISTATE (1 << 5) 88 #define ULTRA_DMA_ENB (1 << 8) 89 #define MULTI_WORD_DMA_ENB (1 << 9) 90 #define DRQ_BLOCK_SIZE_MASK (0x3 << 11) 91 #define DRQ_BLOCK_SIZE_512 (0) 92 #define DRQ_BLOCK_SIZE_1024 (1 << 11) 93 #define DRQ_BLOCK_SIZE_2048 (2 << 11) 94 #define DRQ_BLOCK_SIZE_4096 (3 << 11) 95 /* CF Interface Clock Configuration */ 96 #define CLK_CFG 0x010 97 #define CF_IF_CLK_MASK (0XF) 98 /* CF Timing Mode Configuration */ 99 #define TM_CFG 0x014 100 #define MEM_MODE_TIMING_MASK (0x3) 101 #define MEM_MODE_TIMING_250NS (0x0) 102 #define MEM_MODE_TIMING_120NS (0x1) 103 #define MEM_MODE_TIMING_100NS (0x2) 104 #define MEM_MODE_TIMING_80NS (0x3) 105 106 #define IO_MODE_TIMING_MASK (0x3 << 2) 107 #define IO_MODE_TIMING_250NS (0x0 << 2) 108 #define IO_MODE_TIMING_120NS (0x1 << 2) 109 #define IO_MODE_TIMING_100NS (0x2 << 2) 110 #define IO_MODE_TIMING_80NS (0x3 << 2) 111 112 #define TRUEIDE_PIO_TIMING_MASK (0x7 << 4) 113 #define TRUEIDE_PIO_TIMING_SHIFT 4 114 115 #define TRUEIDE_MWORD_DMA_TIMING_MASK (0x7 << 7) 116 #define TRUEIDE_MWORD_DMA_TIMING_SHIFT 7 117 118 #define ULTRA_DMA_TIMING_MASK (0x7 << 10) 119 #define ULTRA_DMA_TIMING_SHIFT 10 120 /* CF Transfer Address */ 121 #define XFER_ADDR 0x014 122 #define XFER_ADDR_MASK (0x7FF) 123 #define MAX_XFER_COUNT 0x20000u 124 /* Transfer Control */ 125 #define XFER_CTR 0x01C 126 #define XFER_COUNT_MASK (0x3FFFF) 127 #define ADDR_INC_DISABLE (1 << 24) 128 #define XFER_WIDTH_MASK (1 << 25) 129 #define XFER_WIDTH_8B (0) 130 #define XFER_WIDTH_16B (1 << 25) 131 132 #define MEM_TYPE_MASK (1 << 26) 133 #define MEM_TYPE_COMMON (0) 134 #define MEM_TYPE_ATTRIBUTE (1 << 26) 135 136 #define MEM_IO_XFER_MASK (1 << 27) 137 #define MEM_XFER (0) 138 #define IO_XFER (1 << 27) 139 140 #define DMA_XFER_MODE (1 << 28) 141 142 #define AHB_BUS_NORMAL_PIO_OPRTN (~(1 << 29)) 143 #define XFER_DIR_MASK (1 << 30) 144 #define XFER_READ (0) 145 #define XFER_WRITE (1 << 30) 146 147 #define XFER_START (1 << 31) 148 /* Write Data Port */ 149 #define WRITE_PORT 0x024 150 /* Read Data Port */ 151 #define READ_PORT 0x028 152 /* ATA Data Port */ 153 #define ATA_DATA_PORT 0x030 154 #define ATA_DATA_PORT_MASK (0xFFFF) 155 /* ATA Error/Features */ 156 #define ATA_ERR_FTR 0x034 157 /* ATA Sector Count */ 158 #define ATA_SC 0x038 159 /* ATA Sector Number */ 160 #define ATA_SN 0x03C 161 /* ATA Cylinder Low */ 162 #define ATA_CL 0x040 163 /* ATA Cylinder High */ 164 #define ATA_CH 0x044 165 /* ATA Select Card/Head */ 166 #define ATA_SH 0x048 167 /* ATA Status-Command */ 168 #define ATA_STS_CMD 0x04C 169 /* ATA Alternate Status/Device Control */ 170 #define ATA_ASTS_DCTR 0x050 171 /* Extended Write Data Port 0x200-0x3FC */ 172 #define EXT_WRITE_PORT 0x200 173 /* Extended Read Data Port 0x400-0x5FC */ 174 #define EXT_READ_PORT 0x400 175 #define FIFO_SIZE 0x200u 176 /* Global Interrupt Status */ 177 #define GIRQ_STS 0x800 178 /* Global Interrupt Status enable */ 179 #define GIRQ_STS_EN 0x804 180 /* Global Interrupt Signal enable */ 181 #define GIRQ_SGN_EN 0x808 182 #define GIRQ_CF (1) 183 #define GIRQ_XD (1 << 1) 184 185 /* Compact Flash Controller Dev Structure */ 186 struct arasan_cf_dev { 187 /* pointer to ata_host structure */ 188 struct ata_host *host; 189 /* clk structure */ 190 struct clk *clk; 191 192 /* physical base address of controller */ 193 dma_addr_t pbase; 194 /* virtual base address of controller */ 195 void __iomem *vbase; 196 /* irq number*/ 197 int irq; 198 199 /* status to be updated to framework regarding DMA transfer */ 200 u8 dma_status; 201 /* Card is present or Not */ 202 u8 card_present; 203 204 /* dma specific */ 205 /* Completion for transfer complete interrupt from controller */ 206 struct completion cf_completion; 207 /* Completion for DMA transfer complete. */ 208 struct completion dma_completion; 209 /* Dma channel allocated */ 210 struct dma_chan *dma_chan; 211 /* Mask for DMA transfers */ 212 dma_cap_mask_t mask; 213 /* DMA transfer work */ 214 struct work_struct work; 215 /* DMA delayed finish work */ 216 struct delayed_work dwork; 217 /* qc to be transferred using DMA */ 218 struct ata_queued_cmd *qc; 219 }; 220 221 static const struct scsi_host_template arasan_cf_sht = { 222 ATA_BASE_SHT(DRIVER_NAME), 223 .dma_boundary = 0xFFFFFFFFUL, 224 }; 225 cf_dumpregs(struct arasan_cf_dev * acdev)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. */ cf_ginterrupt_enable(struct arasan_cf_dev * acdev,bool enable)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 cf_interrupt_enable(struct arasan_cf_dev * acdev,u32 mask,bool enable)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 cf_card_reset(struct arasan_cf_dev * acdev)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 cf_ctrl_reset(struct arasan_cf_dev * acdev)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 cf_card_detect(struct arasan_cf_dev * acdev,bool hotplugged)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 cf_init(struct arasan_cf_dev * acdev)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 cf_exit(struct arasan_cf_dev * acdev)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 dma_callback(void * dev)357 static void dma_callback(void *dev) 358 { 359 struct arasan_cf_dev *acdev = dev; 360 361 complete(&acdev->dma_completion); 362 } 363 dma_complete(struct arasan_cf_dev * acdev)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 wait4buf(struct arasan_cf_dev * acdev)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 dma_xfer(struct arasan_cf_dev * acdev,dma_addr_t src,dma_addr_t dest,u32 len)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 sg_xfer(struct arasan_cf_dev * acdev,struct scatterlist * sg)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 */ data_xfer(struct work_struct * work)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_chan(acdev->host->dev, "data"); 531 if (IS_ERR(acdev->dma_chan)) { 532 dev_err_probe(acdev->host->dev, PTR_ERR(acdev->dma_chan), 533 "Unable to get dma_chan\n"); 534 acdev->dma_chan = NULL; 535 goto chan_request_fail; 536 } 537 538 for_each_sg(qc->sg, sg, qc->n_elem, temp) { 539 ret = sg_xfer(acdev, sg); 540 if (ret) 541 break; 542 } 543 544 dma_release_channel(acdev->dma_chan); 545 acdev->dma_chan = NULL; 546 547 /* data xferred successfully */ 548 if (!ret) { 549 u32 status; 550 551 spin_lock_irqsave(&acdev->host->lock, flags); 552 status = ioread8(qc->ap->ioaddr.altstatus_addr); 553 spin_unlock_irqrestore(&acdev->host->lock, flags); 554 if (status & (ATA_BUSY | ATA_DRQ)) { 555 ata_sff_queue_delayed_work(&acdev->dwork, 1); 556 return; 557 } 558 559 goto sff_intr; 560 } 561 562 cf_dumpregs(acdev); 563 564 chan_request_fail: 565 spin_lock_irqsave(&acdev->host->lock, flags); 566 /* error when transferring data to/from memory */ 567 qc->err_mask |= AC_ERR_HOST_BUS; 568 qc->ap->hsm_task_state = HSM_ST_ERR; 569 570 cf_ctrl_reset(acdev); 571 spin_unlock_irqrestore(&acdev->host->lock, flags); 572 sff_intr: 573 dma_complete(acdev); 574 } 575 delayed_finish(struct work_struct * work)576 static void delayed_finish(struct work_struct *work) 577 { 578 struct arasan_cf_dev *acdev = container_of(work, struct arasan_cf_dev, 579 dwork.work); 580 struct ata_queued_cmd *qc = acdev->qc; 581 unsigned long flags; 582 u8 status; 583 584 spin_lock_irqsave(&acdev->host->lock, flags); 585 status = ioread8(qc->ap->ioaddr.altstatus_addr); 586 spin_unlock_irqrestore(&acdev->host->lock, flags); 587 588 if (status & (ATA_BUSY | ATA_DRQ)) 589 ata_sff_queue_delayed_work(&acdev->dwork, 1); 590 else 591 dma_complete(acdev); 592 } 593 arasan_cf_interrupt(int irq,void * dev)594 static irqreturn_t arasan_cf_interrupt(int irq, void *dev) 595 { 596 struct arasan_cf_dev *acdev = ((struct ata_host *)dev)->private_data; 597 unsigned long flags; 598 u32 irqsts; 599 600 irqsts = readl(acdev->vbase + GIRQ_STS); 601 if (!(irqsts & GIRQ_CF)) 602 return IRQ_NONE; 603 604 spin_lock_irqsave(&acdev->host->lock, flags); 605 irqsts = readl(acdev->vbase + IRQ_STS); 606 writel(irqsts, acdev->vbase + IRQ_STS); /* clear irqs */ 607 writel(GIRQ_CF, acdev->vbase + GIRQ_STS); /* clear girqs */ 608 609 /* handle only relevant interrupts */ 610 irqsts &= ~IGNORED_IRQS; 611 612 if (irqsts & CARD_DETECT_IRQ) { 613 cf_card_detect(acdev, 1); 614 spin_unlock_irqrestore(&acdev->host->lock, flags); 615 return IRQ_HANDLED; 616 } 617 618 if (irqsts & PIO_XFER_ERR_IRQ) { 619 acdev->dma_status = ATA_DMA_ERR; 620 writel(readl(acdev->vbase + XFER_CTR) & ~XFER_START, 621 acdev->vbase + XFER_CTR); 622 spin_unlock_irqrestore(&acdev->host->lock, flags); 623 complete(&acdev->cf_completion); 624 dev_err(acdev->host->dev, "pio xfer err irq\n"); 625 return IRQ_HANDLED; 626 } 627 628 spin_unlock_irqrestore(&acdev->host->lock, flags); 629 630 if (irqsts & BUF_AVAIL_IRQ) { 631 complete(&acdev->cf_completion); 632 return IRQ_HANDLED; 633 } 634 635 if (irqsts & XFER_DONE_IRQ) { 636 struct ata_queued_cmd *qc = acdev->qc; 637 638 /* Send Complete only for write */ 639 if (qc->tf.flags & ATA_TFLAG_WRITE) 640 complete(&acdev->cf_completion); 641 } 642 643 return IRQ_HANDLED; 644 } 645 arasan_cf_freeze(struct ata_port * ap)646 static void arasan_cf_freeze(struct ata_port *ap) 647 { 648 struct arasan_cf_dev *acdev = ap->host->private_data; 649 650 /* stop transfer and reset controller */ 651 writel(readl(acdev->vbase + XFER_CTR) & ~XFER_START, 652 acdev->vbase + XFER_CTR); 653 cf_ctrl_reset(acdev); 654 acdev->dma_status = ATA_DMA_ERR; 655 656 ata_sff_dma_pause(ap); 657 ata_sff_freeze(ap); 658 } 659 arasan_cf_error_handler(struct ata_port * ap)660 static void arasan_cf_error_handler(struct ata_port *ap) 661 { 662 struct arasan_cf_dev *acdev = ap->host->private_data; 663 664 /* 665 * DMA transfers using an external DMA controller may be scheduled. 666 * Abort them before handling error. Refer data_xfer() for further 667 * details. 668 */ 669 cancel_work_sync(&acdev->work); 670 cancel_delayed_work_sync(&acdev->dwork); 671 return ata_sff_error_handler(ap); 672 } 673 arasan_cf_dma_start(struct arasan_cf_dev * acdev)674 static void arasan_cf_dma_start(struct arasan_cf_dev *acdev) 675 { 676 struct ata_queued_cmd *qc = acdev->qc; 677 struct ata_port *ap = qc->ap; 678 struct ata_taskfile *tf = &qc->tf; 679 u32 xfer_ctr = readl(acdev->vbase + XFER_CTR) & ~XFER_DIR_MASK; 680 u32 write = tf->flags & ATA_TFLAG_WRITE; 681 682 xfer_ctr |= write ? XFER_WRITE : XFER_READ; 683 writel(xfer_ctr, acdev->vbase + XFER_CTR); 684 685 ap->ops->sff_exec_command(ap, tf); 686 ata_sff_queue_work(&acdev->work); 687 } 688 arasan_cf_qc_issue(struct ata_queued_cmd * qc)689 static unsigned int arasan_cf_qc_issue(struct ata_queued_cmd *qc) 690 { 691 struct ata_port *ap = qc->ap; 692 struct arasan_cf_dev *acdev = ap->host->private_data; 693 694 /* defer PIO handling to sff_qc_issue */ 695 if (!ata_is_dma(qc->tf.protocol)) 696 return ata_sff_qc_issue(qc); 697 698 /* select the device */ 699 ata_wait_idle(ap); 700 ata_sff_dev_select(ap, qc->dev->devno); 701 ata_wait_idle(ap); 702 703 /* start the command */ 704 switch (qc->tf.protocol) { 705 case ATA_PROT_DMA: 706 WARN_ON_ONCE(qc->tf.flags & ATA_TFLAG_POLLING); 707 708 trace_ata_tf_load(ap, &qc->tf); 709 ap->ops->sff_tf_load(ap, &qc->tf); 710 acdev->dma_status = 0; 711 acdev->qc = qc; 712 trace_ata_bmdma_start(ap, &qc->tf, qc->tag); 713 arasan_cf_dma_start(acdev); 714 ap->hsm_task_state = HSM_ST_LAST; 715 break; 716 717 default: 718 WARN_ON(1); 719 return AC_ERR_SYSTEM; 720 } 721 722 return 0; 723 } 724 arasan_cf_set_piomode(struct ata_port * ap,struct ata_device * adev)725 static void arasan_cf_set_piomode(struct ata_port *ap, struct ata_device *adev) 726 { 727 struct arasan_cf_dev *acdev = ap->host->private_data; 728 u8 pio = adev->pio_mode - XFER_PIO_0; 729 unsigned long flags; 730 u32 val; 731 732 /* Arasan ctrl supports Mode0 -> Mode6 */ 733 if (pio > 6) { 734 dev_err(ap->dev, "Unknown PIO mode\n"); 735 return; 736 } 737 738 spin_lock_irqsave(&acdev->host->lock, flags); 739 val = readl(acdev->vbase + OP_MODE) & 740 ~(ULTRA_DMA_ENB | MULTI_WORD_DMA_ENB | DRQ_BLOCK_SIZE_MASK); 741 writel(val, acdev->vbase + OP_MODE); 742 val = readl(acdev->vbase + TM_CFG) & ~TRUEIDE_PIO_TIMING_MASK; 743 val |= pio << TRUEIDE_PIO_TIMING_SHIFT; 744 writel(val, acdev->vbase + TM_CFG); 745 746 cf_interrupt_enable(acdev, BUF_AVAIL_IRQ | XFER_DONE_IRQ, 0); 747 cf_interrupt_enable(acdev, PIO_XFER_ERR_IRQ, 1); 748 spin_unlock_irqrestore(&acdev->host->lock, flags); 749 } 750 arasan_cf_set_dmamode(struct ata_port * ap,struct ata_device * adev)751 static void arasan_cf_set_dmamode(struct ata_port *ap, struct ata_device *adev) 752 { 753 struct arasan_cf_dev *acdev = ap->host->private_data; 754 u32 opmode, tmcfg, dma_mode = adev->dma_mode; 755 unsigned long flags; 756 757 spin_lock_irqsave(&acdev->host->lock, flags); 758 opmode = readl(acdev->vbase + OP_MODE) & 759 ~(MULTI_WORD_DMA_ENB | ULTRA_DMA_ENB); 760 tmcfg = readl(acdev->vbase + TM_CFG); 761 762 if ((dma_mode >= XFER_UDMA_0) && (dma_mode <= XFER_UDMA_6)) { 763 opmode |= ULTRA_DMA_ENB; 764 tmcfg &= ~ULTRA_DMA_TIMING_MASK; 765 tmcfg |= (dma_mode - XFER_UDMA_0) << ULTRA_DMA_TIMING_SHIFT; 766 } else if ((dma_mode >= XFER_MW_DMA_0) && (dma_mode <= XFER_MW_DMA_4)) { 767 opmode |= MULTI_WORD_DMA_ENB; 768 tmcfg &= ~TRUEIDE_MWORD_DMA_TIMING_MASK; 769 tmcfg |= (dma_mode - XFER_MW_DMA_0) << 770 TRUEIDE_MWORD_DMA_TIMING_SHIFT; 771 } else { 772 dev_err(ap->dev, "Unknown DMA mode\n"); 773 spin_unlock_irqrestore(&acdev->host->lock, flags); 774 return; 775 } 776 777 writel(opmode, acdev->vbase + OP_MODE); 778 writel(tmcfg, acdev->vbase + TM_CFG); 779 writel(DMA_XFER_MODE, acdev->vbase + XFER_CTR); 780 781 cf_interrupt_enable(acdev, PIO_XFER_ERR_IRQ, 0); 782 cf_interrupt_enable(acdev, BUF_AVAIL_IRQ | XFER_DONE_IRQ, 1); 783 spin_unlock_irqrestore(&acdev->host->lock, flags); 784 } 785 786 static struct ata_port_operations arasan_cf_ops = { 787 .inherits = &ata_sff_port_ops, 788 .freeze = arasan_cf_freeze, 789 .error_handler = arasan_cf_error_handler, 790 .qc_issue = arasan_cf_qc_issue, 791 .set_piomode = arasan_cf_set_piomode, 792 .set_dmamode = arasan_cf_set_dmamode, 793 }; 794 arasan_cf_probe(struct platform_device * pdev)795 static int arasan_cf_probe(struct platform_device *pdev) 796 { 797 struct arasan_cf_dev *acdev; 798 struct arasan_cf_pdata *pdata = dev_get_platdata(&pdev->dev); 799 struct ata_host *host; 800 struct ata_port *ap; 801 struct resource *res; 802 u32 quirk; 803 irq_handler_t irq_handler = NULL; 804 int ret; 805 806 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 807 if (!res) 808 return -EINVAL; 809 810 if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res), 811 DRIVER_NAME)) { 812 dev_warn(&pdev->dev, "Failed to get memory region resource\n"); 813 return -ENOENT; 814 } 815 816 acdev = devm_kzalloc(&pdev->dev, sizeof(*acdev), GFP_KERNEL); 817 if (!acdev) 818 return -ENOMEM; 819 820 if (pdata) 821 quirk = pdata->quirk; 822 else 823 quirk = CF_BROKEN_UDMA; /* as it is on spear1340 */ 824 825 /* 826 * If there's an error getting IRQ (or we do get IRQ0), 827 * support only PIO 828 */ 829 ret = platform_get_irq(pdev, 0); 830 if (ret > 0) { 831 acdev->irq = ret; 832 irq_handler = arasan_cf_interrupt; 833 } else if (ret == -EPROBE_DEFER) { 834 return ret; 835 } else { 836 quirk |= CF_BROKEN_MWDMA | CF_BROKEN_UDMA; 837 } 838 839 acdev->pbase = res->start; 840 acdev->vbase = devm_ioremap(&pdev->dev, res->start, 841 resource_size(res)); 842 if (!acdev->vbase) { 843 dev_warn(&pdev->dev, "ioremap fail\n"); 844 return -ENOMEM; 845 } 846 847 acdev->clk = devm_clk_get(&pdev->dev, NULL); 848 if (IS_ERR(acdev->clk)) { 849 dev_warn(&pdev->dev, "Clock not found\n"); 850 return PTR_ERR(acdev->clk); 851 } 852 853 /* allocate host */ 854 host = ata_host_alloc(&pdev->dev, 1); 855 if (!host) { 856 dev_warn(&pdev->dev, "alloc host fail\n"); 857 return -ENOMEM; 858 } 859 860 ap = host->ports[0]; 861 host->private_data = acdev; 862 acdev->host = host; 863 ap->ops = &arasan_cf_ops; 864 ap->pio_mask = ATA_PIO6; 865 ap->mwdma_mask = ATA_MWDMA4; 866 ap->udma_mask = ATA_UDMA6; 867 868 init_completion(&acdev->cf_completion); 869 init_completion(&acdev->dma_completion); 870 INIT_WORK(&acdev->work, data_xfer); 871 INIT_DELAYED_WORK(&acdev->dwork, delayed_finish); 872 dma_cap_set(DMA_MEMCPY, acdev->mask); 873 874 /* Handle platform specific quirks */ 875 if (quirk) { 876 if (quirk & CF_BROKEN_PIO) { 877 ap->ops->set_piomode = NULL; 878 ap->pio_mask = 0; 879 } 880 if (quirk & CF_BROKEN_MWDMA) 881 ap->mwdma_mask = 0; 882 if (quirk & CF_BROKEN_UDMA) 883 ap->udma_mask = 0; 884 } 885 ap->flags |= ATA_FLAG_PIO_POLLING | ATA_FLAG_NO_ATAPI; 886 887 ap->ioaddr.cmd_addr = acdev->vbase + ATA_DATA_PORT; 888 ap->ioaddr.data_addr = acdev->vbase + ATA_DATA_PORT; 889 ap->ioaddr.error_addr = acdev->vbase + ATA_ERR_FTR; 890 ap->ioaddr.feature_addr = acdev->vbase + ATA_ERR_FTR; 891 ap->ioaddr.nsect_addr = acdev->vbase + ATA_SC; 892 ap->ioaddr.lbal_addr = acdev->vbase + ATA_SN; 893 ap->ioaddr.lbam_addr = acdev->vbase + ATA_CL; 894 ap->ioaddr.lbah_addr = acdev->vbase + ATA_CH; 895 ap->ioaddr.device_addr = acdev->vbase + ATA_SH; 896 ap->ioaddr.status_addr = acdev->vbase + ATA_STS_CMD; 897 ap->ioaddr.command_addr = acdev->vbase + ATA_STS_CMD; 898 ap->ioaddr.altstatus_addr = acdev->vbase + ATA_ASTS_DCTR; 899 ap->ioaddr.ctl_addr = acdev->vbase + ATA_ASTS_DCTR; 900 901 ata_port_desc(ap, "phy_addr %llx virt_addr %p", 902 (unsigned long long) res->start, acdev->vbase); 903 904 ret = cf_init(acdev); 905 if (ret) 906 return ret; 907 908 cf_card_detect(acdev, 0); 909 910 ret = ata_host_activate(host, acdev->irq, irq_handler, 0, 911 &arasan_cf_sht); 912 if (!ret) 913 return 0; 914 915 cf_exit(acdev); 916 917 return ret; 918 } 919 arasan_cf_remove(struct platform_device * pdev)920 static void arasan_cf_remove(struct platform_device *pdev) 921 { 922 struct ata_host *host = platform_get_drvdata(pdev); 923 struct arasan_cf_dev *acdev = host->ports[0]->private_data; 924 925 ata_host_detach(host); 926 cf_exit(acdev); 927 } 928 929 #ifdef CONFIG_PM_SLEEP arasan_cf_suspend(struct device * dev)930 static int arasan_cf_suspend(struct device *dev) 931 { 932 struct ata_host *host = dev_get_drvdata(dev); 933 struct arasan_cf_dev *acdev = host->ports[0]->private_data; 934 935 if (acdev->dma_chan) 936 dmaengine_terminate_all(acdev->dma_chan); 937 938 cf_exit(acdev); 939 ata_host_suspend(host, PMSG_SUSPEND); 940 return 0; 941 } 942 arasan_cf_resume(struct device * dev)943 static int arasan_cf_resume(struct device *dev) 944 { 945 struct ata_host *host = dev_get_drvdata(dev); 946 struct arasan_cf_dev *acdev = host->ports[0]->private_data; 947 948 cf_init(acdev); 949 ata_host_resume(host); 950 951 return 0; 952 } 953 #endif 954 955 static SIMPLE_DEV_PM_OPS(arasan_cf_pm_ops, arasan_cf_suspend, arasan_cf_resume); 956 957 #ifdef CONFIG_OF 958 static const struct of_device_id arasan_cf_id_table[] = { 959 { .compatible = "arasan,cf-spear1340" }, 960 {} 961 }; 962 MODULE_DEVICE_TABLE(of, arasan_cf_id_table); 963 #endif 964 965 static struct platform_driver arasan_cf_driver = { 966 .probe = arasan_cf_probe, 967 .remove_new = arasan_cf_remove, 968 .driver = { 969 .name = DRIVER_NAME, 970 .pm = &arasan_cf_pm_ops, 971 .of_match_table = of_match_ptr(arasan_cf_id_table), 972 }, 973 }; 974 975 module_platform_driver(arasan_cf_driver); 976 977 MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>"); 978 MODULE_DESCRIPTION("Arasan ATA Compact Flash driver"); 979 MODULE_LICENSE("GPL"); 980 MODULE_ALIAS("platform:" DRIVER_NAME); 981