1 /* 2 * Calxeda Highbank AHCI SATA platform driver 3 * Copyright 2012 Calxeda, Inc. 4 * 5 * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms and conditions of the GNU General Public License, 9 * version 2, as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 #include <linux/kernel.h> 20 #include <linux/gfp.h> 21 #include <linux/module.h> 22 #include <linux/init.h> 23 #include <linux/types.h> 24 #include <linux/err.h> 25 #include <linux/io.h> 26 #include <linux/spinlock.h> 27 #include <linux/device.h> 28 #include <linux/of_device.h> 29 #include <linux/of_address.h> 30 #include <linux/platform_device.h> 31 #include <linux/libata.h> 32 #include <linux/ahci_platform.h> 33 #include <linux/interrupt.h> 34 #include <linux/delay.h> 35 #include <linux/export.h> 36 #include <linux/gpio.h> 37 #include <linux/of_gpio.h> 38 39 #include "ahci.h" 40 41 #define CPHY_MAP(dev, addr) ((((dev) & 0x1f) << 7) | (((addr) >> 9) & 0x7f)) 42 #define CPHY_ADDR(addr) (((addr) & 0x1ff) << 2) 43 #define SERDES_CR_CTL 0x80a0 44 #define SERDES_CR_ADDR 0x80a1 45 #define SERDES_CR_DATA 0x80a2 46 #define CR_BUSY 0x0001 47 #define CR_START 0x0001 48 #define CR_WR_RDN 0x0002 49 #define CPHY_TX_INPUT_STS 0x2001 50 #define CPHY_RX_INPUT_STS 0x2002 51 #define CPHY_SATA_TX_OVERRIDE 0x8000 52 #define CPHY_SATA_RX_OVERRIDE 0x4000 53 #define CPHY_TX_OVERRIDE 0x2004 54 #define CPHY_RX_OVERRIDE 0x2005 55 #define SPHY_LANE 0x100 56 #define SPHY_HALF_RATE 0x0001 57 #define CPHY_SATA_DPLL_MODE 0x0700 58 #define CPHY_SATA_DPLL_SHIFT 8 59 #define CPHY_SATA_DPLL_RESET (1 << 11) 60 #define CPHY_SATA_TX_ATTEN 0x1c00 61 #define CPHY_SATA_TX_ATTEN_SHIFT 10 62 #define CPHY_PHY_COUNT 6 63 #define CPHY_LANE_COUNT 4 64 #define CPHY_PORT_COUNT (CPHY_PHY_COUNT * CPHY_LANE_COUNT) 65 66 static DEFINE_SPINLOCK(cphy_lock); 67 /* Each of the 6 phys can have up to 4 sata ports attached to i. Map 0-based 68 * sata ports to their phys and then to their lanes within the phys 69 */ 70 struct phy_lane_info { 71 void __iomem *phy_base; 72 u8 lane_mapping; 73 u8 phy_devs; 74 u8 tx_atten; 75 }; 76 static struct phy_lane_info port_data[CPHY_PORT_COUNT]; 77 78 static DEFINE_SPINLOCK(sgpio_lock); 79 #define SCLOCK 0 80 #define SLOAD 1 81 #define SDATA 2 82 #define SGPIO_PINS 3 83 #define SGPIO_PORTS 8 84 85 struct ecx_plat_data { 86 u32 n_ports; 87 /* number of extra clocks that the SGPIO PIC controller expects */ 88 u32 pre_clocks; 89 u32 post_clocks; 90 unsigned sgpio_gpio[SGPIO_PINS]; 91 u32 sgpio_pattern; 92 u32 port_to_sgpio[SGPIO_PORTS]; 93 }; 94 95 #define SGPIO_SIGNALS 3 96 #define ECX_ACTIVITY_BITS 0x300000 97 #define ECX_ACTIVITY_SHIFT 0 98 #define ECX_LOCATE_BITS 0x80000 99 #define ECX_LOCATE_SHIFT 1 100 #define ECX_FAULT_BITS 0x400000 101 #define ECX_FAULT_SHIFT 2 102 static inline int sgpio_bit_shift(struct ecx_plat_data *pdata, u32 port, 103 u32 shift) 104 { 105 return 1 << (3 * pdata->port_to_sgpio[port] + shift); 106 } 107 108 static void ecx_parse_sgpio(struct ecx_plat_data *pdata, u32 port, u32 state) 109 { 110 if (state & ECX_ACTIVITY_BITS) 111 pdata->sgpio_pattern |= sgpio_bit_shift(pdata, port, 112 ECX_ACTIVITY_SHIFT); 113 else 114 pdata->sgpio_pattern &= ~sgpio_bit_shift(pdata, port, 115 ECX_ACTIVITY_SHIFT); 116 if (state & ECX_LOCATE_BITS) 117 pdata->sgpio_pattern |= sgpio_bit_shift(pdata, port, 118 ECX_LOCATE_SHIFT); 119 else 120 pdata->sgpio_pattern &= ~sgpio_bit_shift(pdata, port, 121 ECX_LOCATE_SHIFT); 122 if (state & ECX_FAULT_BITS) 123 pdata->sgpio_pattern |= sgpio_bit_shift(pdata, port, 124 ECX_FAULT_SHIFT); 125 else 126 pdata->sgpio_pattern &= ~sgpio_bit_shift(pdata, port, 127 ECX_FAULT_SHIFT); 128 } 129 130 /* 131 * Tell the LED controller that the signal has changed by raising the clock 132 * line for 50 uS and then lowering it for 50 uS. 133 */ 134 static void ecx_led_cycle_clock(struct ecx_plat_data *pdata) 135 { 136 gpio_set_value(pdata->sgpio_gpio[SCLOCK], 1); 137 udelay(50); 138 gpio_set_value(pdata->sgpio_gpio[SCLOCK], 0); 139 udelay(50); 140 } 141 142 static ssize_t ecx_transmit_led_message(struct ata_port *ap, u32 state, 143 ssize_t size) 144 { 145 struct ahci_host_priv *hpriv = ap->host->private_data; 146 struct ecx_plat_data *pdata = (struct ecx_plat_data *) hpriv->plat_data; 147 struct ahci_port_priv *pp = ap->private_data; 148 unsigned long flags; 149 int pmp, i; 150 struct ahci_em_priv *emp; 151 u32 sgpio_out; 152 153 /* get the slot number from the message */ 154 pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8; 155 if (pmp < EM_MAX_SLOTS) 156 emp = &pp->em_priv[pmp]; 157 else 158 return -EINVAL; 159 160 if (!(hpriv->em_msg_type & EM_MSG_TYPE_LED)) 161 return size; 162 163 spin_lock_irqsave(&sgpio_lock, flags); 164 ecx_parse_sgpio(pdata, ap->port_no, state); 165 sgpio_out = pdata->sgpio_pattern; 166 for (i = 0; i < pdata->pre_clocks; i++) 167 ecx_led_cycle_clock(pdata); 168 169 gpio_set_value(pdata->sgpio_gpio[SLOAD], 1); 170 ecx_led_cycle_clock(pdata); 171 gpio_set_value(pdata->sgpio_gpio[SLOAD], 0); 172 /* 173 * bit-bang out the SGPIO pattern, by consuming a bit and then 174 * clocking it out. 175 */ 176 for (i = 0; i < (SGPIO_SIGNALS * pdata->n_ports); i++) { 177 gpio_set_value(pdata->sgpio_gpio[SDATA], sgpio_out & 1); 178 sgpio_out >>= 1; 179 ecx_led_cycle_clock(pdata); 180 } 181 for (i = 0; i < pdata->post_clocks; i++) 182 ecx_led_cycle_clock(pdata); 183 184 /* save off new led state for port/slot */ 185 emp->led_state = state; 186 187 spin_unlock_irqrestore(&sgpio_lock, flags); 188 return size; 189 } 190 191 static void highbank_set_em_messages(struct device *dev, 192 struct ahci_host_priv *hpriv, 193 struct ata_port_info *pi) 194 { 195 struct device_node *np = dev->of_node; 196 struct ecx_plat_data *pdata = hpriv->plat_data; 197 int i; 198 int err; 199 200 for (i = 0; i < SGPIO_PINS; i++) { 201 err = of_get_named_gpio(np, "calxeda,sgpio-gpio", i); 202 if (IS_ERR_VALUE(err)) 203 return; 204 205 pdata->sgpio_gpio[i] = err; 206 err = gpio_request(pdata->sgpio_gpio[i], "CX SGPIO"); 207 if (err) { 208 pr_err("sata_highbank gpio_request %d failed: %d\n", 209 i, err); 210 return; 211 } 212 gpio_direction_output(pdata->sgpio_gpio[i], 1); 213 } 214 of_property_read_u32_array(np, "calxeda,led-order", 215 pdata->port_to_sgpio, 216 pdata->n_ports); 217 if (of_property_read_u32(np, "calxeda,pre-clocks", &pdata->pre_clocks)) 218 pdata->pre_clocks = 0; 219 if (of_property_read_u32(np, "calxeda,post-clocks", 220 &pdata->post_clocks)) 221 pdata->post_clocks = 0; 222 223 /* store em_loc */ 224 hpriv->em_loc = 0; 225 hpriv->em_buf_sz = 4; 226 hpriv->em_msg_type = EM_MSG_TYPE_LED; 227 pi->flags |= ATA_FLAG_EM | ATA_FLAG_SW_ACTIVITY; 228 } 229 230 static u32 __combo_phy_reg_read(u8 sata_port, u32 addr) 231 { 232 u32 data; 233 u8 dev = port_data[sata_port].phy_devs; 234 spin_lock(&cphy_lock); 235 writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800); 236 data = readl(port_data[sata_port].phy_base + CPHY_ADDR(addr)); 237 spin_unlock(&cphy_lock); 238 return data; 239 } 240 241 static void __combo_phy_reg_write(u8 sata_port, u32 addr, u32 data) 242 { 243 u8 dev = port_data[sata_port].phy_devs; 244 spin_lock(&cphy_lock); 245 writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800); 246 writel(data, port_data[sata_port].phy_base + CPHY_ADDR(addr)); 247 spin_unlock(&cphy_lock); 248 } 249 250 static void combo_phy_wait_for_ready(u8 sata_port) 251 { 252 while (__combo_phy_reg_read(sata_port, SERDES_CR_CTL) & CR_BUSY) 253 udelay(5); 254 } 255 256 static u32 combo_phy_read(u8 sata_port, u32 addr) 257 { 258 combo_phy_wait_for_ready(sata_port); 259 __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr); 260 __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_START); 261 combo_phy_wait_for_ready(sata_port); 262 return __combo_phy_reg_read(sata_port, SERDES_CR_DATA); 263 } 264 265 static void combo_phy_write(u8 sata_port, u32 addr, u32 data) 266 { 267 combo_phy_wait_for_ready(sata_port); 268 __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr); 269 __combo_phy_reg_write(sata_port, SERDES_CR_DATA, data); 270 __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_WR_RDN | CR_START); 271 } 272 273 static void highbank_cphy_disable_overrides(u8 sata_port) 274 { 275 u8 lane = port_data[sata_port].lane_mapping; 276 u32 tmp; 277 if (unlikely(port_data[sata_port].phy_base == NULL)) 278 return; 279 tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE); 280 tmp &= ~CPHY_SATA_RX_OVERRIDE; 281 combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); 282 } 283 284 static void cphy_override_tx_attenuation(u8 sata_port, u32 val) 285 { 286 u8 lane = port_data[sata_port].lane_mapping; 287 u32 tmp; 288 289 if (val & 0x8) 290 return; 291 292 tmp = combo_phy_read(sata_port, CPHY_TX_INPUT_STS + lane * SPHY_LANE); 293 tmp &= ~CPHY_SATA_TX_OVERRIDE; 294 combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp); 295 296 tmp |= CPHY_SATA_TX_OVERRIDE; 297 combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp); 298 299 tmp |= (val << CPHY_SATA_TX_ATTEN_SHIFT) & CPHY_SATA_TX_ATTEN; 300 combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp); 301 } 302 303 static void cphy_override_rx_mode(u8 sata_port, u32 val) 304 { 305 u8 lane = port_data[sata_port].lane_mapping; 306 u32 tmp; 307 tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE); 308 tmp &= ~CPHY_SATA_RX_OVERRIDE; 309 combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); 310 311 tmp |= CPHY_SATA_RX_OVERRIDE; 312 combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); 313 314 tmp &= ~CPHY_SATA_DPLL_MODE; 315 tmp |= val << CPHY_SATA_DPLL_SHIFT; 316 combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); 317 318 tmp |= CPHY_SATA_DPLL_RESET; 319 combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); 320 321 tmp &= ~CPHY_SATA_DPLL_RESET; 322 combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp); 323 324 msleep(15); 325 } 326 327 static void highbank_cphy_override_lane(u8 sata_port) 328 { 329 u8 lane = port_data[sata_port].lane_mapping; 330 u32 tmp, k = 0; 331 332 if (unlikely(port_data[sata_port].phy_base == NULL)) 333 return; 334 do { 335 tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + 336 lane * SPHY_LANE); 337 } while ((tmp & SPHY_HALF_RATE) && (k++ < 1000)); 338 cphy_override_rx_mode(sata_port, 3); 339 cphy_override_tx_attenuation(sata_port, port_data[sata_port].tx_atten); 340 } 341 342 static int highbank_initialize_phys(struct device *dev, void __iomem *addr) 343 { 344 struct device_node *sata_node = dev->of_node; 345 int phy_count = 0, phy, port = 0, i; 346 void __iomem *cphy_base[CPHY_PHY_COUNT]; 347 struct device_node *phy_nodes[CPHY_PHY_COUNT]; 348 u32 tx_atten[CPHY_PORT_COUNT]; 349 350 memset(port_data, 0, sizeof(struct phy_lane_info) * CPHY_PORT_COUNT); 351 memset(phy_nodes, 0, sizeof(struct device_node*) * CPHY_PHY_COUNT); 352 memset(tx_atten, 0xff, CPHY_PORT_COUNT); 353 354 do { 355 u32 tmp; 356 struct of_phandle_args phy_data; 357 if (of_parse_phandle_with_args(sata_node, 358 "calxeda,port-phys", "#phy-cells", 359 port, &phy_data)) 360 break; 361 for (phy = 0; phy < phy_count; phy++) { 362 if (phy_nodes[phy] == phy_data.np) 363 break; 364 } 365 if (phy_nodes[phy] == NULL) { 366 phy_nodes[phy] = phy_data.np; 367 cphy_base[phy] = of_iomap(phy_nodes[phy], 0); 368 if (cphy_base[phy] == NULL) { 369 return 0; 370 } 371 phy_count += 1; 372 } 373 port_data[port].lane_mapping = phy_data.args[0]; 374 of_property_read_u32(phy_nodes[phy], "phydev", &tmp); 375 port_data[port].phy_devs = tmp; 376 port_data[port].phy_base = cphy_base[phy]; 377 of_node_put(phy_data.np); 378 port += 1; 379 } while (port < CPHY_PORT_COUNT); 380 of_property_read_u32_array(sata_node, "calxeda,tx-atten", 381 tx_atten, port); 382 for (i = 0; i < port; i++) 383 port_data[i].tx_atten = (u8) tx_atten[i]; 384 return 0; 385 } 386 387 /* 388 * The Calxeda SATA phy intermittently fails to bring up a link with Gen3 389 * Retrying the phy hard reset can work around the issue, but the drive 390 * may fail again. In less than 150 out of 15000 test runs, it took more 391 * than 10 tries for the link to be established (but never more than 35). 392 * Triple the maximum observed retry count to provide plenty of margin for 393 * rare events and to guarantee that the link is established. 394 * 395 * Also, the default 2 second time-out on a failed drive is too long in 396 * this situation. The uboot implementation of the same driver function 397 * uses a much shorter time-out period and never experiences a time out 398 * issue. Reducing the time-out to 500ms improves the responsiveness. 399 * The other timing constants were kept the same as the stock AHCI driver. 400 * This change was also tested 15000 times on 24 drives and none of them 401 * experienced a time out. 402 */ 403 static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class, 404 unsigned long deadline) 405 { 406 static const unsigned long timing[] = { 5, 100, 500}; 407 struct ata_port *ap = link->ap; 408 struct ahci_port_priv *pp = ap->private_data; 409 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG; 410 struct ata_taskfile tf; 411 bool online; 412 u32 sstatus; 413 int rc; 414 int retry = 100; 415 416 ahci_stop_engine(ap); 417 418 /* clear D2H reception area to properly wait for D2H FIS */ 419 ata_tf_init(link->device, &tf); 420 tf.command = ATA_BUSY; 421 ata_tf_to_fis(&tf, 0, 0, d2h_fis); 422 423 do { 424 highbank_cphy_disable_overrides(link->ap->port_no); 425 rc = sata_link_hardreset(link, timing, deadline, &online, NULL); 426 highbank_cphy_override_lane(link->ap->port_no); 427 428 /* If the status is 1, we are connected, but the link did not 429 * come up. So retry resetting the link again. 430 */ 431 if (sata_scr_read(link, SCR_STATUS, &sstatus)) 432 break; 433 if (!(sstatus & 0x3)) 434 break; 435 } while (!online && retry--); 436 437 ahci_start_engine(ap); 438 439 if (online) 440 *class = ahci_dev_classify(ap); 441 442 return rc; 443 } 444 445 static struct ata_port_operations ahci_highbank_ops = { 446 .inherits = &ahci_ops, 447 .hardreset = ahci_highbank_hardreset, 448 .transmit_led_message = ecx_transmit_led_message, 449 }; 450 451 static const struct ata_port_info ahci_highbank_port_info = { 452 .flags = AHCI_FLAG_COMMON, 453 .pio_mask = ATA_PIO4, 454 .udma_mask = ATA_UDMA6, 455 .port_ops = &ahci_highbank_ops, 456 }; 457 458 static struct scsi_host_template ahci_highbank_platform_sht = { 459 AHCI_SHT("sata_highbank"), 460 }; 461 462 static const struct of_device_id ahci_of_match[] = { 463 { .compatible = "calxeda,hb-ahci" }, 464 {}, 465 }; 466 MODULE_DEVICE_TABLE(of, ahci_of_match); 467 468 static int ahci_highbank_probe(struct platform_device *pdev) 469 { 470 struct device *dev = &pdev->dev; 471 struct ahci_host_priv *hpriv; 472 struct ecx_plat_data *pdata; 473 struct ata_host *host; 474 struct resource *mem; 475 int irq; 476 int i; 477 int rc; 478 u32 n_ports; 479 struct ata_port_info pi = ahci_highbank_port_info; 480 const struct ata_port_info *ppi[] = { &pi, NULL }; 481 482 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 483 if (!mem) { 484 dev_err(dev, "no mmio space\n"); 485 return -EINVAL; 486 } 487 488 irq = platform_get_irq(pdev, 0); 489 if (irq <= 0) { 490 dev_err(dev, "no irq\n"); 491 return -EINVAL; 492 } 493 494 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL); 495 if (!hpriv) { 496 dev_err(dev, "can't alloc ahci_host_priv\n"); 497 return -ENOMEM; 498 } 499 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 500 if (!pdata) { 501 dev_err(dev, "can't alloc ecx_plat_data\n"); 502 return -ENOMEM; 503 } 504 505 hpriv->flags |= (unsigned long)pi.private_data; 506 507 hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem)); 508 if (!hpriv->mmio) { 509 dev_err(dev, "can't map %pR\n", mem); 510 return -ENOMEM; 511 } 512 513 rc = highbank_initialize_phys(dev, hpriv->mmio); 514 if (rc) 515 return rc; 516 517 518 ahci_save_initial_config(dev, hpriv, 0, 0); 519 520 /* prepare host */ 521 if (hpriv->cap & HOST_CAP_NCQ) 522 pi.flags |= ATA_FLAG_NCQ; 523 524 if (hpriv->cap & HOST_CAP_PMP) 525 pi.flags |= ATA_FLAG_PMP; 526 527 if (hpriv->cap & HOST_CAP_64) 528 dma_set_coherent_mask(dev, DMA_BIT_MASK(64)); 529 530 /* CAP.NP sometimes indicate the index of the last enabled 531 * port, at other times, that of the last possible port, so 532 * determining the maximum port number requires looking at 533 * both CAP.NP and port_map. 534 */ 535 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); 536 537 pdata->n_ports = n_ports; 538 hpriv->plat_data = pdata; 539 highbank_set_em_messages(dev, hpriv, &pi); 540 541 host = ata_host_alloc_pinfo(dev, ppi, n_ports); 542 if (!host) { 543 rc = -ENOMEM; 544 goto err0; 545 } 546 547 host->private_data = hpriv; 548 549 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) 550 host->flags |= ATA_HOST_PARALLEL_SCAN; 551 552 for (i = 0; i < host->n_ports; i++) { 553 struct ata_port *ap = host->ports[i]; 554 555 ata_port_desc(ap, "mmio %pR", mem); 556 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); 557 558 /* set enclosure management message type */ 559 if (ap->flags & ATA_FLAG_EM) 560 ap->em_message_type = hpriv->em_msg_type; 561 562 /* disabled/not-implemented port */ 563 if (!(hpriv->port_map & (1 << i))) 564 ap->ops = &ata_dummy_port_ops; 565 } 566 567 rc = ahci_reset_controller(host); 568 if (rc) 569 goto err0; 570 571 ahci_init_controller(host); 572 ahci_print_info(host, "platform"); 573 574 rc = ata_host_activate(host, irq, ahci_interrupt, 0, 575 &ahci_highbank_platform_sht); 576 if (rc) 577 goto err0; 578 579 return 0; 580 err0: 581 return rc; 582 } 583 584 #ifdef CONFIG_PM_SLEEP 585 static int ahci_highbank_suspend(struct device *dev) 586 { 587 struct ata_host *host = dev_get_drvdata(dev); 588 struct ahci_host_priv *hpriv = host->private_data; 589 void __iomem *mmio = hpriv->mmio; 590 u32 ctl; 591 int rc; 592 593 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { 594 dev_err(dev, "firmware update required for suspend/resume\n"); 595 return -EIO; 596 } 597 598 /* 599 * AHCI spec rev1.1 section 8.3.3: 600 * Software must disable interrupts prior to requesting a 601 * transition of the HBA to D3 state. 602 */ 603 ctl = readl(mmio + HOST_CTL); 604 ctl &= ~HOST_IRQ_EN; 605 writel(ctl, mmio + HOST_CTL); 606 readl(mmio + HOST_CTL); /* flush */ 607 608 rc = ata_host_suspend(host, PMSG_SUSPEND); 609 if (rc) 610 return rc; 611 612 return 0; 613 } 614 615 static int ahci_highbank_resume(struct device *dev) 616 { 617 struct ata_host *host = dev_get_drvdata(dev); 618 int rc; 619 620 if (dev->power.power_state.event == PM_EVENT_SUSPEND) { 621 rc = ahci_reset_controller(host); 622 if (rc) 623 return rc; 624 625 ahci_init_controller(host); 626 } 627 628 ata_host_resume(host); 629 630 return 0; 631 } 632 #endif 633 634 static SIMPLE_DEV_PM_OPS(ahci_highbank_pm_ops, 635 ahci_highbank_suspend, ahci_highbank_resume); 636 637 static struct platform_driver ahci_highbank_driver = { 638 .remove = ata_platform_remove_one, 639 .driver = { 640 .name = "highbank-ahci", 641 .owner = THIS_MODULE, 642 .of_match_table = ahci_of_match, 643 .pm = &ahci_highbank_pm_ops, 644 }, 645 .probe = ahci_highbank_probe, 646 }; 647 648 module_platform_driver(ahci_highbank_driver); 649 650 MODULE_DESCRIPTION("Calxeda Highbank AHCI SATA platform driver"); 651 MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@calxeda.com>"); 652 MODULE_LICENSE("GPL"); 653 MODULE_ALIAS("sata:highbank"); 654