1/* 2 * Driver for the Octeon bootbus compact flash. 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2005 - 2012 Cavium Inc. 9 * Copyright (C) 2008 Wind River Systems 10 */ 11 12#include <linux/kernel.h> 13#include <linux/module.h> 14#include <linux/libata.h> 15#include <linux/hrtimer.h> 16#include <linux/slab.h> 17#include <linux/irq.h> 18#include <linux/of.h> 19#include <linux/of_address.h> 20#include <linux/of_platform.h> 21#include <linux/platform_device.h> 22#include <scsi/scsi_host.h> 23#include <trace/events/libata.h> 24#include <asm/byteorder.h> 25#include <asm/octeon/octeon.h> 26 27/* 28 * The Octeon bootbus compact flash interface is connected in at least 29 * 3 different configurations on various evaluation boards: 30 * 31 * -- 8 bits no irq, no DMA 32 * -- 16 bits no irq, no DMA 33 * -- 16 bits True IDE mode with DMA, but no irq. 34 * 35 * In the last case the DMA engine can generate an interrupt when the 36 * transfer is complete. For the first two cases only PIO is supported. 37 * 38 */ 39 40#define DRV_NAME "pata_octeon_cf" 41#define DRV_VERSION "2.2" 42 43/* Poll interval in nS. */ 44#define OCTEON_CF_BUSY_POLL_INTERVAL 500000 45 46#define DMA_CFG 0 47#define DMA_TIM 0x20 48#define DMA_INT 0x38 49#define DMA_INT_EN 0x50 50 51struct octeon_cf_port { 52 struct hrtimer delayed_finish; 53 struct ata_port *ap; 54 int dma_finished; 55 void *c0; 56 unsigned int cs0; 57 unsigned int cs1; 58 bool is_true_ide; 59 u64 dma_base; 60}; 61 62static const struct scsi_host_template octeon_cf_sht = { 63 ATA_PIO_SHT(DRV_NAME), 64}; 65 66static int enable_dma; 67module_param(enable_dma, int, 0444); 68MODULE_PARM_DESC(enable_dma, 69 "Enable use of DMA on interfaces that support it (0=no dma [default], 1=use dma)"); 70 71/* 72 * Convert nanosecond based time to setting used in the 73 * boot bus timing register, based on timing multiple 74 */ 75static unsigned int ns_to_tim_reg(unsigned int tim_mult, unsigned int nsecs) 76{ 77 /* 78 * Compute # of eclock periods to get desired duration in 79 * nanoseconds. 80 */ 81 return DIV_ROUND_UP(nsecs * (octeon_get_io_clock_rate() / 1000000), 82 1000 * tim_mult); 83} 84 85static void octeon_cf_set_boot_reg_cfg(int cs, unsigned int multiplier) 86{ 87 union cvmx_mio_boot_reg_cfgx reg_cfg; 88 unsigned int tim_mult; 89 90 switch (multiplier) { 91 case 8: 92 tim_mult = 3; 93 break; 94 case 4: 95 tim_mult = 0; 96 break; 97 case 2: 98 tim_mult = 2; 99 break; 100 default: 101 tim_mult = 1; 102 break; 103 } 104 105 reg_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs)); 106 reg_cfg.s.dmack = 0; /* Don't assert DMACK on access */ 107 reg_cfg.s.tim_mult = tim_mult; /* Timing mutiplier */ 108 reg_cfg.s.rd_dly = 0; /* Sample on falling edge of BOOT_OE */ 109 reg_cfg.s.sam = 0; /* Don't combine write and output enable */ 110 reg_cfg.s.we_ext = 0; /* No write enable extension */ 111 reg_cfg.s.oe_ext = 0; /* No read enable extension */ 112 reg_cfg.s.en = 1; /* Enable this region */ 113 reg_cfg.s.orbit = 0; /* Don't combine with previous region */ 114 reg_cfg.s.ale = 0; /* Don't do address multiplexing */ 115 cvmx_write_csr(CVMX_MIO_BOOT_REG_CFGX(cs), reg_cfg.u64); 116} 117 118/* 119 * Called after libata determines the needed PIO mode. This 120 * function programs the Octeon bootbus regions to support the 121 * timing requirements of the PIO mode. 122 * 123 * @ap: ATA port information 124 * @dev: ATA device 125 */ 126static void octeon_cf_set_piomode(struct ata_port *ap, struct ata_device *dev) 127{ 128 struct octeon_cf_port *cf_port = ap->private_data; 129 union cvmx_mio_boot_reg_timx reg_tim; 130 int T; 131 struct ata_timing timing; 132 133 unsigned int div; 134 int use_iordy; 135 int trh; 136 int pause; 137 /* These names are timing parameters from the ATA spec */ 138 int t2; 139 140 /* 141 * A divisor value of four will overflow the timing fields at 142 * clock rates greater than 800MHz 143 */ 144 if (octeon_get_io_clock_rate() <= 800000000) 145 div = 4; 146 else 147 div = 8; 148 T = (int)((1000000000000LL * div) / octeon_get_io_clock_rate()); 149 150 BUG_ON(ata_timing_compute(dev, dev->pio_mode, &timing, T, T)); 151 152 t2 = timing.active; 153 if (t2) 154 t2--; 155 156 trh = ns_to_tim_reg(div, 20); 157 if (trh) 158 trh--; 159 160 pause = (int)timing.cycle - (int)timing.active - 161 (int)timing.setup - trh; 162 if (pause < 0) 163 pause = 0; 164 if (pause) 165 pause--; 166 167 octeon_cf_set_boot_reg_cfg(cf_port->cs0, div); 168 if (cf_port->is_true_ide) 169 /* True IDE mode, program both chip selects. */ 170 octeon_cf_set_boot_reg_cfg(cf_port->cs1, div); 171 172 173 use_iordy = ata_pio_need_iordy(dev); 174 175 reg_tim.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_TIMX(cf_port->cs0)); 176 /* Disable page mode */ 177 reg_tim.s.pagem = 0; 178 /* Enable dynamic timing */ 179 reg_tim.s.waitm = use_iordy; 180 /* Pages are disabled */ 181 reg_tim.s.pages = 0; 182 /* We don't use multiplexed address mode */ 183 reg_tim.s.ale = 0; 184 /* Not used */ 185 reg_tim.s.page = 0; 186 /* Time after IORDY to coninue to assert the data */ 187 reg_tim.s.wait = 0; 188 /* Time to wait to complete the cycle. */ 189 reg_tim.s.pause = pause; 190 /* How long to hold after a write to de-assert CE. */ 191 reg_tim.s.wr_hld = trh; 192 /* How long to wait after a read to de-assert CE. */ 193 reg_tim.s.rd_hld = trh; 194 /* How long write enable is asserted */ 195 reg_tim.s.we = t2; 196 /* How long read enable is asserted */ 197 reg_tim.s.oe = t2; 198 /* Time after CE that read/write starts */ 199 reg_tim.s.ce = ns_to_tim_reg(div, 5); 200 /* Time before CE that address is valid */ 201 reg_tim.s.adr = 0; 202 203 /* Program the bootbus region timing for the data port chip select. */ 204 cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cf_port->cs0), reg_tim.u64); 205 if (cf_port->is_true_ide) 206 /* True IDE mode, program both chip selects. */ 207 cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cf_port->cs1), 208 reg_tim.u64); 209} 210 211static void octeon_cf_set_dmamode(struct ata_port *ap, struct ata_device *dev) 212{ 213 struct octeon_cf_port *cf_port = ap->private_data; 214 union cvmx_mio_boot_pin_defs pin_defs; 215 union cvmx_mio_boot_dma_timx dma_tim; 216 unsigned int oe_a; 217 unsigned int oe_n; 218 unsigned int dma_ackh; 219 unsigned int dma_arq; 220 unsigned int pause; 221 unsigned int T0, Tkr, Td; 222 unsigned int tim_mult; 223 int c; 224 225 const struct ata_timing *timing; 226 227 timing = ata_timing_find_mode(dev->dma_mode); 228 T0 = timing->cycle; 229 Td = timing->active; 230 Tkr = timing->recover; 231 dma_ackh = timing->dmack_hold; 232 233 dma_tim.u64 = 0; 234 /* dma_tim.s.tim_mult = 0 --> 4x */ 235 tim_mult = 4; 236 237 /* not spec'ed, value in eclocks, not affected by tim_mult */ 238 dma_arq = 8; 239 pause = 25 - dma_arq * 1000 / 240 (octeon_get_io_clock_rate() / 1000000); /* Tz */ 241 242 oe_a = Td; 243 /* Tkr from cf spec, lengthened to meet T0 */ 244 oe_n = max(T0 - oe_a, Tkr); 245 246 pin_defs.u64 = cvmx_read_csr(CVMX_MIO_BOOT_PIN_DEFS); 247 248 /* DMA channel number. */ 249 c = (cf_port->dma_base & 8) >> 3; 250 251 /* Invert the polarity if the default is 0*/ 252 dma_tim.s.dmack_pi = (pin_defs.u64 & (1ull << (11 + c))) ? 0 : 1; 253 254 dma_tim.s.oe_n = ns_to_tim_reg(tim_mult, oe_n); 255 dma_tim.s.oe_a = ns_to_tim_reg(tim_mult, oe_a); 256 257 /* 258 * This is tI, C.F. spec. says 0, but Sony CF card requires 259 * more, we use 20 nS. 260 */ 261 dma_tim.s.dmack_s = ns_to_tim_reg(tim_mult, 20); 262 dma_tim.s.dmack_h = ns_to_tim_reg(tim_mult, dma_ackh); 263 264 dma_tim.s.dmarq = dma_arq; 265 dma_tim.s.pause = ns_to_tim_reg(tim_mult, pause); 266 267 dma_tim.s.rd_dly = 0; /* Sample right on edge */ 268 269 /* writes only */ 270 dma_tim.s.we_n = ns_to_tim_reg(tim_mult, oe_n); 271 dma_tim.s.we_a = ns_to_tim_reg(tim_mult, oe_a); 272 273 ata_dev_dbg(dev, "ns to ticks (mult %d) of %d is: %d\n", tim_mult, 60, 274 ns_to_tim_reg(tim_mult, 60)); 275 ata_dev_dbg(dev, "oe_n: %d, oe_a: %d, dmack_s: %d, dmack_h: %d, dmarq: %d, pause: %d\n", 276 dma_tim.s.oe_n, dma_tim.s.oe_a, dma_tim.s.dmack_s, 277 dma_tim.s.dmack_h, dma_tim.s.dmarq, dma_tim.s.pause); 278 279 cvmx_write_csr(cf_port->dma_base + DMA_TIM, dma_tim.u64); 280} 281 282/* 283 * Handle an 8 bit I/O request. 284 * 285 * @qc: Queued command 286 * @buffer: Data buffer 287 * @buflen: Length of the buffer. 288 * @rw: True to write. 289 */ 290static unsigned int octeon_cf_data_xfer8(struct ata_queued_cmd *qc, 291 unsigned char *buffer, 292 unsigned int buflen, 293 int rw) 294{ 295 struct ata_port *ap = qc->dev->link->ap; 296 void __iomem *data_addr = ap->ioaddr.data_addr; 297 unsigned long words; 298 int count; 299 300 words = buflen; 301 if (rw) { 302 count = 16; 303 while (words--) { 304 iowrite8(*buffer, data_addr); 305 buffer++; 306 /* 307 * Every 16 writes do a read so the bootbus 308 * FIFO doesn't fill up. 309 */ 310 if (--count == 0) { 311 ioread8(ap->ioaddr.altstatus_addr); 312 count = 16; 313 } 314 } 315 } else { 316 ioread8_rep(data_addr, buffer, words); 317 } 318 return buflen; 319} 320 321/* 322 * Handle a 16 bit I/O request. 323 * 324 * @qc: Queued command 325 * @buffer: Data buffer 326 * @buflen: Length of the buffer. 327 * @rw: True to write. 328 */ 329static unsigned int octeon_cf_data_xfer16(struct ata_queued_cmd *qc, 330 unsigned char *buffer, 331 unsigned int buflen, 332 int rw) 333{ 334 struct ata_port *ap = qc->dev->link->ap; 335 void __iomem *data_addr = ap->ioaddr.data_addr; 336 unsigned long words; 337 int count; 338 339 words = buflen / 2; 340 if (rw) { 341 count = 16; 342 while (words--) { 343 iowrite16(*(uint16_t *)buffer, data_addr); 344 buffer += sizeof(uint16_t); 345 /* 346 * Every 16 writes do a read so the bootbus 347 * FIFO doesn't fill up. 348 */ 349 if (--count == 0) { 350 ioread8(ap->ioaddr.altstatus_addr); 351 count = 16; 352 } 353 } 354 } else { 355 while (words--) { 356 *(uint16_t *)buffer = ioread16(data_addr); 357 buffer += sizeof(uint16_t); 358 } 359 } 360 /* Transfer trailing 1 byte, if any. */ 361 if (unlikely(buflen & 0x01)) { 362 __le16 align_buf[1] = { 0 }; 363 364 if (rw == READ) { 365 align_buf[0] = cpu_to_le16(ioread16(data_addr)); 366 memcpy(buffer, align_buf, 1); 367 } else { 368 memcpy(align_buf, buffer, 1); 369 iowrite16(le16_to_cpu(align_buf[0]), data_addr); 370 } 371 words++; 372 } 373 return buflen; 374} 375 376/* 377 * Read the taskfile for 16bit non-True IDE only. 378 */ 379static void octeon_cf_tf_read16(struct ata_port *ap, struct ata_taskfile *tf) 380{ 381 u16 blob; 382 /* The base of the registers is at ioaddr.data_addr. */ 383 void __iomem *base = ap->ioaddr.data_addr; 384 385 blob = __raw_readw(base + 0xc); 386 tf->error = blob >> 8; 387 388 blob = __raw_readw(base + 2); 389 tf->nsect = blob & 0xff; 390 tf->lbal = blob >> 8; 391 392 blob = __raw_readw(base + 4); 393 tf->lbam = blob & 0xff; 394 tf->lbah = blob >> 8; 395 396 blob = __raw_readw(base + 6); 397 tf->device = blob & 0xff; 398 tf->status = blob >> 8; 399 400 if (tf->flags & ATA_TFLAG_LBA48) { 401 if (likely(ap->ioaddr.ctl_addr)) { 402 iowrite8(tf->ctl | ATA_HOB, ap->ioaddr.ctl_addr); 403 404 blob = __raw_readw(base + 0xc); 405 tf->hob_feature = blob >> 8; 406 407 blob = __raw_readw(base + 2); 408 tf->hob_nsect = blob & 0xff; 409 tf->hob_lbal = blob >> 8; 410 411 blob = __raw_readw(base + 4); 412 tf->hob_lbam = blob & 0xff; 413 tf->hob_lbah = blob >> 8; 414 415 iowrite8(tf->ctl, ap->ioaddr.ctl_addr); 416 ap->last_ctl = tf->ctl; 417 } else { 418 WARN_ON(1); 419 } 420 } 421} 422 423static u8 octeon_cf_check_status16(struct ata_port *ap) 424{ 425 u16 blob; 426 void __iomem *base = ap->ioaddr.data_addr; 427 428 blob = __raw_readw(base + 6); 429 return blob >> 8; 430} 431 432static int octeon_cf_softreset16(struct ata_link *link, unsigned int *classes, 433 unsigned long deadline) 434{ 435 struct ata_port *ap = link->ap; 436 void __iomem *base = ap->ioaddr.data_addr; 437 int rc; 438 u8 err; 439 440 __raw_writew(ap->ctl, base + 0xe); 441 udelay(20); 442 __raw_writew(ap->ctl | ATA_SRST, base + 0xe); 443 udelay(20); 444 __raw_writew(ap->ctl, base + 0xe); 445 446 rc = ata_sff_wait_after_reset(link, 1, deadline); 447 if (rc) { 448 ata_link_err(link, "SRST failed (errno=%d)\n", rc); 449 return rc; 450 } 451 452 /* determine by signature whether we have ATA or ATAPI devices */ 453 classes[0] = ata_sff_dev_classify(&link->device[0], 1, &err); 454 return 0; 455} 456 457/* 458 * Load the taskfile for 16bit non-True IDE only. The device_addr is 459 * not loaded, we do this as part of octeon_cf_exec_command16. 460 */ 461static void octeon_cf_tf_load16(struct ata_port *ap, 462 const struct ata_taskfile *tf) 463{ 464 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR; 465 /* The base of the registers is at ioaddr.data_addr. */ 466 void __iomem *base = ap->ioaddr.data_addr; 467 468 if (tf->ctl != ap->last_ctl) { 469 iowrite8(tf->ctl, ap->ioaddr.ctl_addr); 470 ap->last_ctl = tf->ctl; 471 ata_wait_idle(ap); 472 } 473 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) { 474 __raw_writew(tf->hob_feature << 8, base + 0xc); 475 __raw_writew(tf->hob_nsect | tf->hob_lbal << 8, base + 2); 476 __raw_writew(tf->hob_lbam | tf->hob_lbah << 8, base + 4); 477 } 478 if (is_addr) { 479 __raw_writew(tf->feature << 8, base + 0xc); 480 __raw_writew(tf->nsect | tf->lbal << 8, base + 2); 481 __raw_writew(tf->lbam | tf->lbah << 8, base + 4); 482 } 483 ata_wait_idle(ap); 484} 485 486 487static void octeon_cf_dev_select(struct ata_port *ap, unsigned int device) 488{ 489/* There is only one device, do nothing. */ 490 return; 491} 492 493/* 494 * Issue ATA command to host controller. The device_addr is also sent 495 * as it must be written in a combined write with the command. 496 */ 497static void octeon_cf_exec_command16(struct ata_port *ap, 498 const struct ata_taskfile *tf) 499{ 500 /* The base of the registers is at ioaddr.data_addr. */ 501 void __iomem *base = ap->ioaddr.data_addr; 502 u16 blob = 0; 503 504 if (tf->flags & ATA_TFLAG_DEVICE) 505 blob = tf->device; 506 507 blob |= (tf->command << 8); 508 __raw_writew(blob, base + 6); 509 510 ata_wait_idle(ap); 511} 512 513static void octeon_cf_ata_port_noaction(struct ata_port *ap) 514{ 515} 516 517static void octeon_cf_dma_setup(struct ata_queued_cmd *qc) 518{ 519 struct ata_port *ap = qc->ap; 520 struct octeon_cf_port *cf_port; 521 522 cf_port = ap->private_data; 523 /* issue r/w command */ 524 qc->cursg = qc->sg; 525 cf_port->dma_finished = 0; 526 ap->ops->sff_exec_command(ap, &qc->tf); 527} 528 529/* 530 * Start a DMA transfer that was already setup 531 * 532 * @qc: Information about the DMA 533 */ 534static void octeon_cf_dma_start(struct ata_queued_cmd *qc) 535{ 536 struct octeon_cf_port *cf_port = qc->ap->private_data; 537 union cvmx_mio_boot_dma_cfgx mio_boot_dma_cfg; 538 union cvmx_mio_boot_dma_intx mio_boot_dma_int; 539 struct scatterlist *sg; 540 541 /* Get the scatter list entry we need to DMA into */ 542 sg = qc->cursg; 543 BUG_ON(!sg); 544 545 /* 546 * Clear the DMA complete status. 547 */ 548 mio_boot_dma_int.u64 = 0; 549 mio_boot_dma_int.s.done = 1; 550 cvmx_write_csr(cf_port->dma_base + DMA_INT, mio_boot_dma_int.u64); 551 552 /* Enable the interrupt. */ 553 cvmx_write_csr(cf_port->dma_base + DMA_INT_EN, mio_boot_dma_int.u64); 554 555 /* Set the direction of the DMA */ 556 mio_boot_dma_cfg.u64 = 0; 557#ifdef __LITTLE_ENDIAN 558 mio_boot_dma_cfg.s.endian = 1; 559#endif 560 mio_boot_dma_cfg.s.en = 1; 561 mio_boot_dma_cfg.s.rw = ((qc->tf.flags & ATA_TFLAG_WRITE) != 0); 562 563 /* 564 * Don't stop the DMA if the device deasserts DMARQ. Many 565 * compact flashes deassert DMARQ for a short time between 566 * sectors. Instead of stopping and restarting the DMA, we'll 567 * let the hardware do it. If the DMA is really stopped early 568 * due to an error condition, a later timeout will force us to 569 * stop. 570 */ 571 mio_boot_dma_cfg.s.clr = 0; 572 573 /* Size is specified in 16bit words and minus one notation */ 574 mio_boot_dma_cfg.s.size = sg_dma_len(sg) / 2 - 1; 575 576 /* We need to swap the high and low bytes of every 16 bits */ 577 mio_boot_dma_cfg.s.swap8 = 1; 578 579 mio_boot_dma_cfg.s.adr = sg_dma_address(sg); 580 581 cvmx_write_csr(cf_port->dma_base + DMA_CFG, mio_boot_dma_cfg.u64); 582} 583 584/* 585 * 586 * LOCKING: 587 * spin_lock_irqsave(host lock) 588 * 589 */ 590static unsigned int octeon_cf_dma_finished(struct ata_port *ap, 591 struct ata_queued_cmd *qc) 592{ 593 struct ata_eh_info *ehi = &ap->link.eh_info; 594 struct octeon_cf_port *cf_port = ap->private_data; 595 union cvmx_mio_boot_dma_cfgx dma_cfg; 596 union cvmx_mio_boot_dma_intx dma_int; 597 u8 status; 598 599 trace_ata_bmdma_stop(ap, &qc->tf, qc->tag); 600 601 if (ap->hsm_task_state != HSM_ST_LAST) 602 return 0; 603 604 dma_cfg.u64 = cvmx_read_csr(cf_port->dma_base + DMA_CFG); 605 if (dma_cfg.s.size != 0xfffff) { 606 /* Error, the transfer was not complete. */ 607 qc->err_mask |= AC_ERR_HOST_BUS; 608 ap->hsm_task_state = HSM_ST_ERR; 609 } 610 611 /* Stop and clear the dma engine. */ 612 dma_cfg.u64 = 0; 613 dma_cfg.s.size = -1; 614 cvmx_write_csr(cf_port->dma_base + DMA_CFG, dma_cfg.u64); 615 616 /* Disable the interrupt. */ 617 dma_int.u64 = 0; 618 cvmx_write_csr(cf_port->dma_base + DMA_INT_EN, dma_int.u64); 619 620 /* Clear the DMA complete status */ 621 dma_int.s.done = 1; 622 cvmx_write_csr(cf_port->dma_base + DMA_INT, dma_int.u64); 623 624 status = ap->ops->sff_check_status(ap); 625 626 ata_sff_hsm_move(ap, qc, status, 0); 627 628 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA)) 629 ata_ehi_push_desc(ehi, "DMA stat 0x%x", status); 630 631 return 1; 632} 633 634/* 635 * Check if any queued commands have more DMAs, if so start the next 636 * transfer, else do end of transfer handling. 637 */ 638static irqreturn_t octeon_cf_interrupt(int irq, void *dev_instance) 639{ 640 struct ata_host *host = dev_instance; 641 struct octeon_cf_port *cf_port; 642 int i; 643 unsigned int handled = 0; 644 unsigned long flags; 645 646 spin_lock_irqsave(&host->lock, flags); 647 648 for (i = 0; i < host->n_ports; i++) { 649 u8 status; 650 struct ata_port *ap; 651 struct ata_queued_cmd *qc; 652 union cvmx_mio_boot_dma_intx dma_int; 653 union cvmx_mio_boot_dma_cfgx dma_cfg; 654 655 ap = host->ports[i]; 656 cf_port = ap->private_data; 657 658 dma_int.u64 = cvmx_read_csr(cf_port->dma_base + DMA_INT); 659 dma_cfg.u64 = cvmx_read_csr(cf_port->dma_base + DMA_CFG); 660 661 qc = ata_qc_from_tag(ap, ap->link.active_tag); 662 663 if (!qc || (qc->tf.flags & ATA_TFLAG_POLLING)) 664 continue; 665 666 if (dma_int.s.done && !dma_cfg.s.en) { 667 if (!sg_is_last(qc->cursg)) { 668 qc->cursg = sg_next(qc->cursg); 669 handled = 1; 670 trace_ata_bmdma_start(ap, &qc->tf, qc->tag); 671 octeon_cf_dma_start(qc); 672 continue; 673 } else { 674 cf_port->dma_finished = 1; 675 } 676 } 677 if (!cf_port->dma_finished) 678 continue; 679 status = ioread8(ap->ioaddr.altstatus_addr); 680 if (status & (ATA_BUSY | ATA_DRQ)) { 681 /* 682 * We are busy, try to handle it later. This 683 * is the DMA finished interrupt, and it could 684 * take a little while for the card to be 685 * ready for more commands. 686 */ 687 /* Clear DMA irq. */ 688 dma_int.u64 = 0; 689 dma_int.s.done = 1; 690 cvmx_write_csr(cf_port->dma_base + DMA_INT, 691 dma_int.u64); 692 hrtimer_start_range_ns(&cf_port->delayed_finish, 693 ns_to_ktime(OCTEON_CF_BUSY_POLL_INTERVAL), 694 OCTEON_CF_BUSY_POLL_INTERVAL / 5, 695 HRTIMER_MODE_REL); 696 handled = 1; 697 } else { 698 handled |= octeon_cf_dma_finished(ap, qc); 699 } 700 } 701 spin_unlock_irqrestore(&host->lock, flags); 702 return IRQ_RETVAL(handled); 703} 704 705static enum hrtimer_restart octeon_cf_delayed_finish(struct hrtimer *hrt) 706{ 707 struct octeon_cf_port *cf_port = container_of(hrt, 708 struct octeon_cf_port, 709 delayed_finish); 710 struct ata_port *ap = cf_port->ap; 711 struct ata_host *host = ap->host; 712 struct ata_queued_cmd *qc; 713 unsigned long flags; 714 u8 status; 715 enum hrtimer_restart rv = HRTIMER_NORESTART; 716 717 spin_lock_irqsave(&host->lock, flags); 718 719 /* 720 * If the port is not waiting for completion, it must have 721 * handled it previously. The hsm_task_state is 722 * protected by host->lock. 723 */ 724 if (ap->hsm_task_state != HSM_ST_LAST || !cf_port->dma_finished) 725 goto out; 726 727 status = ioread8(ap->ioaddr.altstatus_addr); 728 if (status & (ATA_BUSY | ATA_DRQ)) { 729 /* Still busy, try again. */ 730 hrtimer_forward_now(hrt, 731 ns_to_ktime(OCTEON_CF_BUSY_POLL_INTERVAL)); 732 rv = HRTIMER_RESTART; 733 goto out; 734 } 735 qc = ata_qc_from_tag(ap, ap->link.active_tag); 736 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) 737 octeon_cf_dma_finished(ap, qc); 738out: 739 spin_unlock_irqrestore(&host->lock, flags); 740 return rv; 741} 742 743static void octeon_cf_dev_config(struct ata_device *dev) 744{ 745 /* 746 * A maximum of 2^20 - 1 16 bit transfers are possible with 747 * the bootbus DMA. So we need to throttle max_sectors to 748 * (2^12 - 1 == 4095) to assure that this can never happen. 749 */ 750 dev->max_sectors = min(dev->max_sectors, 4095U); 751} 752 753/* 754 * We don't do ATAPI DMA so return 0. 755 */ 756static int octeon_cf_check_atapi_dma(struct ata_queued_cmd *qc) 757{ 758 return 0; 759} 760 761static unsigned int octeon_cf_qc_issue(struct ata_queued_cmd *qc) 762{ 763 struct ata_port *ap = qc->ap; 764 765 switch (qc->tf.protocol) { 766 case ATA_PROT_DMA: 767 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING); 768 769 trace_ata_tf_load(ap, &qc->tf); 770 ap->ops->sff_tf_load(ap, &qc->tf); /* load tf registers */ 771 trace_ata_bmdma_setup(ap, &qc->tf, qc->tag); 772 octeon_cf_dma_setup(qc); /* set up dma */ 773 trace_ata_bmdma_start(ap, &qc->tf, qc->tag); 774 octeon_cf_dma_start(qc); /* initiate dma */ 775 ap->hsm_task_state = HSM_ST_LAST; 776 break; 777 778 case ATAPI_PROT_DMA: 779 dev_err(ap->dev, "Error, ATAPI not supported\n"); 780 BUG(); 781 782 default: 783 return ata_sff_qc_issue(qc); 784 } 785 786 return 0; 787} 788 789static struct ata_port_operations octeon_cf_ops = { 790 .inherits = &ata_sff_port_ops, 791 .check_atapi_dma = octeon_cf_check_atapi_dma, 792 .qc_prep = ata_noop_qc_prep, 793 .qc_issue = octeon_cf_qc_issue, 794 .sff_dev_select = octeon_cf_dev_select, 795 .sff_irq_on = octeon_cf_ata_port_noaction, 796 .sff_irq_clear = octeon_cf_ata_port_noaction, 797 .cable_detect = ata_cable_40wire, 798 .set_piomode = octeon_cf_set_piomode, 799 .set_dmamode = octeon_cf_set_dmamode, 800 .dev_config = octeon_cf_dev_config, 801}; 802 803static int octeon_cf_probe(struct platform_device *pdev) 804{ 805 struct resource *res_cs0, *res_cs1; 806 807 bool is_16bit; 808 u64 reg; 809 struct device_node *node; 810 void __iomem *cs0; 811 void __iomem *cs1 = NULL; 812 struct ata_host *host; 813 struct ata_port *ap; 814 int irq = 0; 815 irq_handler_t irq_handler = NULL; 816 void __iomem *base; 817 struct octeon_cf_port *cf_port; 818 u32 bus_width; 819 int rv; 820 821 node = pdev->dev.of_node; 822 if (node == NULL) 823 return -EINVAL; 824 825 cf_port = devm_kzalloc(&pdev->dev, sizeof(*cf_port), GFP_KERNEL); 826 if (!cf_port) 827 return -ENOMEM; 828 829 cf_port->is_true_ide = of_property_read_bool(node, "cavium,true-ide"); 830 831 if (of_property_read_u32(node, "cavium,bus-width", &bus_width) == 0) 832 is_16bit = (bus_width == 16); 833 else 834 is_16bit = false; 835 836 rv = of_property_read_reg(node, 0, ®, NULL); 837 if (rv < 0) 838 return rv; 839 cf_port->cs0 = upper_32_bits(reg); 840 841 if (cf_port->is_true_ide) { 842 struct device_node *dma_node; 843 dma_node = of_parse_phandle(node, 844 "cavium,dma-engine-handle", 0); 845 if (dma_node) { 846 struct platform_device *dma_dev; 847 dma_dev = of_find_device_by_node(dma_node); 848 if (dma_dev) { 849 struct resource *res_dma; 850 int i; 851 res_dma = platform_get_resource(dma_dev, IORESOURCE_MEM, 0); 852 if (!res_dma) { 853 put_device(&dma_dev->dev); 854 of_node_put(dma_node); 855 return -EINVAL; 856 } 857 cf_port->dma_base = (u64)devm_ioremap(&pdev->dev, res_dma->start, 858 resource_size(res_dma)); 859 if (!cf_port->dma_base) { 860 put_device(&dma_dev->dev); 861 of_node_put(dma_node); 862 return -EINVAL; 863 } 864 865 i = platform_get_irq(dma_dev, 0); 866 if (i > 0) { 867 irq = i; 868 irq_handler = octeon_cf_interrupt; 869 } 870 put_device(&dma_dev->dev); 871 } 872 of_node_put(dma_node); 873 } 874 res_cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); 875 if (!res_cs1) 876 return -EINVAL; 877 878 cs1 = devm_ioremap(&pdev->dev, res_cs1->start, 879 resource_size(res_cs1)); 880 if (!cs1) 881 return -EINVAL; 882 883 rv = of_property_read_reg(node, 1, ®, NULL); 884 if (rv < 0) 885 return rv; 886 cf_port->cs1 = upper_32_bits(reg); 887 } 888 889 res_cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); 890 if (!res_cs0) 891 return -EINVAL; 892 893 cs0 = devm_ioremap(&pdev->dev, res_cs0->start, 894 resource_size(res_cs0)); 895 if (!cs0) 896 return -ENOMEM; 897 898 /* allocate host */ 899 host = ata_host_alloc(&pdev->dev, 1); 900 if (!host) 901 return -ENOMEM; 902 903 ap = host->ports[0]; 904 ap->private_data = cf_port; 905 pdev->dev.platform_data = cf_port; 906 cf_port->ap = ap; 907 ap->ops = &octeon_cf_ops; 908 ap->pio_mask = ATA_PIO6; 909 ap->flags |= ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING; 910 911 if (!is_16bit) { 912 base = cs0 + 0x800; 913 ap->ioaddr.cmd_addr = base; 914 ata_sff_std_ports(&ap->ioaddr); 915 916 ap->ioaddr.altstatus_addr = base + 0xe; 917 ap->ioaddr.ctl_addr = base + 0xe; 918 octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer8; 919 } else if (cf_port->is_true_ide) { 920 base = cs0; 921 ap->ioaddr.cmd_addr = base + (ATA_REG_CMD << 1) + 1; 922 ap->ioaddr.data_addr = base + (ATA_REG_DATA << 1); 923 ap->ioaddr.error_addr = base + (ATA_REG_ERR << 1) + 1; 924 ap->ioaddr.feature_addr = base + (ATA_REG_FEATURE << 1) + 1; 925 ap->ioaddr.nsect_addr = base + (ATA_REG_NSECT << 1) + 1; 926 ap->ioaddr.lbal_addr = base + (ATA_REG_LBAL << 1) + 1; 927 ap->ioaddr.lbam_addr = base + (ATA_REG_LBAM << 1) + 1; 928 ap->ioaddr.lbah_addr = base + (ATA_REG_LBAH << 1) + 1; 929 ap->ioaddr.device_addr = base + (ATA_REG_DEVICE << 1) + 1; 930 ap->ioaddr.status_addr = base + (ATA_REG_STATUS << 1) + 1; 931 ap->ioaddr.command_addr = base + (ATA_REG_CMD << 1) + 1; 932 ap->ioaddr.altstatus_addr = cs1 + (6 << 1) + 1; 933 ap->ioaddr.ctl_addr = cs1 + (6 << 1) + 1; 934 octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer16; 935 936 ap->mwdma_mask = enable_dma ? ATA_MWDMA4 : 0; 937 938 /* True IDE mode needs a timer to poll for not-busy. */ 939 hrtimer_init(&cf_port->delayed_finish, CLOCK_MONOTONIC, 940 HRTIMER_MODE_REL); 941 cf_port->delayed_finish.function = octeon_cf_delayed_finish; 942 } else { 943 /* 16 bit but not True IDE */ 944 base = cs0 + 0x800; 945 octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer16; 946 octeon_cf_ops.softreset = octeon_cf_softreset16; 947 octeon_cf_ops.sff_check_status = octeon_cf_check_status16; 948 octeon_cf_ops.sff_tf_read = octeon_cf_tf_read16; 949 octeon_cf_ops.sff_tf_load = octeon_cf_tf_load16; 950 octeon_cf_ops.sff_exec_command = octeon_cf_exec_command16; 951 952 ap->ioaddr.data_addr = base + ATA_REG_DATA; 953 ap->ioaddr.nsect_addr = base + ATA_REG_NSECT; 954 ap->ioaddr.lbal_addr = base + ATA_REG_LBAL; 955 ap->ioaddr.ctl_addr = base + 0xe; 956 ap->ioaddr.altstatus_addr = base + 0xe; 957 } 958 cf_port->c0 = ap->ioaddr.ctl_addr; 959 960 rv = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); 961 if (rv) 962 return rv; 963 964 ata_port_desc(ap, "cmd %p ctl %p", base, ap->ioaddr.ctl_addr); 965 966 dev_info(&pdev->dev, "version " DRV_VERSION" %d bit%s.\n", 967 is_16bit ? 16 : 8, 968 cf_port->is_true_ide ? ", True IDE" : ""); 969 970 return ata_host_activate(host, irq, irq_handler, 971 IRQF_SHARED, &octeon_cf_sht); 972} 973 974static void octeon_cf_shutdown(struct device *dev) 975{ 976 union cvmx_mio_boot_dma_cfgx dma_cfg; 977 union cvmx_mio_boot_dma_intx dma_int; 978 979 struct octeon_cf_port *cf_port = dev_get_platdata(dev); 980 981 if (cf_port->dma_base) { 982 /* Stop and clear the dma engine. */ 983 dma_cfg.u64 = 0; 984 dma_cfg.s.size = -1; 985 cvmx_write_csr(cf_port->dma_base + DMA_CFG, dma_cfg.u64); 986 987 /* Disable the interrupt. */ 988 dma_int.u64 = 0; 989 cvmx_write_csr(cf_port->dma_base + DMA_INT_EN, dma_int.u64); 990 991 /* Clear the DMA complete status */ 992 dma_int.s.done = 1; 993 cvmx_write_csr(cf_port->dma_base + DMA_INT, dma_int.u64); 994 995 __raw_writeb(0, cf_port->c0); 996 udelay(20); 997 __raw_writeb(ATA_SRST, cf_port->c0); 998 udelay(20); 999 __raw_writeb(0, cf_port->c0); 1000 mdelay(100); 1001 } 1002} 1003 1004static const struct of_device_id octeon_cf_match[] = { 1005 { .compatible = "cavium,ebt3000-compact-flash", }, 1006 { /* sentinel */ } 1007}; 1008MODULE_DEVICE_TABLE(of, octeon_cf_match); 1009 1010static struct platform_driver octeon_cf_driver = { 1011 .probe = octeon_cf_probe, 1012 .driver = { 1013 .name = DRV_NAME, 1014 .of_match_table = octeon_cf_match, 1015 .shutdown = octeon_cf_shutdown 1016 }, 1017}; 1018 1019static int __init octeon_cf_init(void) 1020{ 1021 return platform_driver_register(&octeon_cf_driver); 1022} 1023 1024 1025MODULE_AUTHOR("David Daney <ddaney@caviumnetworks.com>"); 1026MODULE_DESCRIPTION("low-level driver for Cavium OCTEON Compact Flash PATA"); 1027MODULE_LICENSE("GPL"); 1028MODULE_VERSION(DRV_VERSION); 1029MODULE_ALIAS("platform:" DRV_NAME); 1030 1031module_init(octeon_cf_init); 1032