1 2 /* 3 * acard-ahci.c - ACard AHCI SATA support 4 * 5 * Maintained by: Tejun Heo <tj@kernel.org> 6 * Please ALWAYS copy linux-ide@vger.kernel.org 7 * on emails. 8 * 9 * Copyright 2010 Red Hat, Inc. 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * AHCI hardware documentation: 31 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf 32 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf 33 * 34 */ 35 36 #include <linux/kernel.h> 37 #include <linux/module.h> 38 #include <linux/pci.h> 39 #include <linux/blkdev.h> 40 #include <linux/delay.h> 41 #include <linux/interrupt.h> 42 #include <linux/dma-mapping.h> 43 #include <linux/device.h> 44 #include <linux/dmi.h> 45 #include <linux/gfp.h> 46 #include <scsi/scsi_host.h> 47 #include <scsi/scsi_cmnd.h> 48 #include <linux/libata.h> 49 #include "ahci.h" 50 51 #define DRV_NAME "acard-ahci" 52 #define DRV_VERSION "1.0" 53 54 /* 55 Received FIS structure limited to 80h. 56 */ 57 58 #define ACARD_AHCI_RX_FIS_SZ 128 59 60 enum { 61 AHCI_PCI_BAR = 5, 62 }; 63 64 enum board_ids { 65 board_acard_ahci, 66 }; 67 68 struct acard_sg { 69 __le32 addr; 70 __le32 addr_hi; 71 __le32 reserved; 72 __le32 size; /* bit 31 (EOT) max==0x10000 (64k) */ 73 }; 74 75 static void acard_ahci_qc_prep(struct ata_queued_cmd *qc); 76 static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc); 77 static int acard_ahci_port_start(struct ata_port *ap); 78 static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent); 79 80 #ifdef CONFIG_PM_SLEEP 81 static int acard_ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg); 82 static int acard_ahci_pci_device_resume(struct pci_dev *pdev); 83 #endif 84 85 static struct scsi_host_template acard_ahci_sht = { 86 AHCI_SHT("acard-ahci"), 87 }; 88 89 static struct ata_port_operations acard_ops = { 90 .inherits = &ahci_ops, 91 .qc_prep = acard_ahci_qc_prep, 92 .qc_fill_rtf = acard_ahci_qc_fill_rtf, 93 .port_start = acard_ahci_port_start, 94 }; 95 96 #define AHCI_HFLAGS(flags) .private_data = (void *)(flags) 97 98 static const struct ata_port_info acard_ahci_port_info[] = { 99 [board_acard_ahci] = 100 { 101 AHCI_HFLAGS (AHCI_HFLAG_NO_NCQ), 102 .flags = AHCI_FLAG_COMMON, 103 .pio_mask = ATA_PIO4, 104 .udma_mask = ATA_UDMA6, 105 .port_ops = &acard_ops, 106 }, 107 }; 108 109 static const struct pci_device_id acard_ahci_pci_tbl[] = { 110 /* ACard */ 111 { PCI_VDEVICE(ARTOP, 0x000d), board_acard_ahci }, /* ATP8620 */ 112 113 { } /* terminate list */ 114 }; 115 116 static struct pci_driver acard_ahci_pci_driver = { 117 .name = DRV_NAME, 118 .id_table = acard_ahci_pci_tbl, 119 .probe = acard_ahci_init_one, 120 .remove = ata_pci_remove_one, 121 #ifdef CONFIG_PM_SLEEP 122 .suspend = acard_ahci_pci_device_suspend, 123 .resume = acard_ahci_pci_device_resume, 124 #endif 125 }; 126 127 #ifdef CONFIG_PM_SLEEP 128 static int acard_ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg) 129 { 130 struct ata_host *host = pci_get_drvdata(pdev); 131 struct ahci_host_priv *hpriv = host->private_data; 132 void __iomem *mmio = hpriv->mmio; 133 u32 ctl; 134 135 if (mesg.event & PM_EVENT_SUSPEND && 136 hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { 137 dev_err(&pdev->dev, 138 "BIOS update required for suspend/resume\n"); 139 return -EIO; 140 } 141 142 if (mesg.event & PM_EVENT_SLEEP) { 143 /* AHCI spec rev1.1 section 8.3.3: 144 * Software must disable interrupts prior to requesting a 145 * transition of the HBA to D3 state. 146 */ 147 ctl = readl(mmio + HOST_CTL); 148 ctl &= ~HOST_IRQ_EN; 149 writel(ctl, mmio + HOST_CTL); 150 readl(mmio + HOST_CTL); /* flush */ 151 } 152 153 return ata_pci_device_suspend(pdev, mesg); 154 } 155 156 static int acard_ahci_pci_device_resume(struct pci_dev *pdev) 157 { 158 struct ata_host *host = pci_get_drvdata(pdev); 159 int rc; 160 161 rc = ata_pci_device_do_resume(pdev); 162 if (rc) 163 return rc; 164 165 if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) { 166 rc = ahci_reset_controller(host); 167 if (rc) 168 return rc; 169 170 ahci_init_controller(host); 171 } 172 173 ata_host_resume(host); 174 175 return 0; 176 } 177 #endif 178 179 static int acard_ahci_configure_dma_masks(struct pci_dev *pdev, int using_dac) 180 { 181 int rc; 182 183 if (using_dac && 184 !dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) { 185 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); 186 if (rc) { 187 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 188 if (rc) { 189 dev_err(&pdev->dev, 190 "64-bit DMA enable failed\n"); 191 return rc; 192 } 193 } 194 } else { 195 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 196 if (rc) { 197 dev_err(&pdev->dev, "32-bit DMA enable failed\n"); 198 return rc; 199 } 200 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 201 if (rc) { 202 dev_err(&pdev->dev, 203 "32-bit consistent DMA enable failed\n"); 204 return rc; 205 } 206 } 207 return 0; 208 } 209 210 static void acard_ahci_pci_print_info(struct ata_host *host) 211 { 212 struct pci_dev *pdev = to_pci_dev(host->dev); 213 u16 cc; 214 const char *scc_s; 215 216 pci_read_config_word(pdev, 0x0a, &cc); 217 if (cc == PCI_CLASS_STORAGE_IDE) 218 scc_s = "IDE"; 219 else if (cc == PCI_CLASS_STORAGE_SATA) 220 scc_s = "SATA"; 221 else if (cc == PCI_CLASS_STORAGE_RAID) 222 scc_s = "RAID"; 223 else 224 scc_s = "unknown"; 225 226 ahci_print_info(host, scc_s); 227 } 228 229 static unsigned int acard_ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl) 230 { 231 struct scatterlist *sg; 232 struct acard_sg *acard_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ; 233 unsigned int si, last_si = 0; 234 235 VPRINTK("ENTER\n"); 236 237 /* 238 * Next, the S/G list. 239 */ 240 for_each_sg(qc->sg, sg, qc->n_elem, si) { 241 dma_addr_t addr = sg_dma_address(sg); 242 u32 sg_len = sg_dma_len(sg); 243 244 /* 245 * ACard note: 246 * We must set an end-of-table (EOT) bit, 247 * and the segment cannot exceed 64k (0x10000) 248 */ 249 acard_sg[si].addr = cpu_to_le32(addr & 0xffffffff); 250 acard_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16); 251 acard_sg[si].size = cpu_to_le32(sg_len); 252 last_si = si; 253 } 254 255 acard_sg[last_si].size |= cpu_to_le32(1 << 31); /* set EOT */ 256 257 return si; 258 } 259 260 static void acard_ahci_qc_prep(struct ata_queued_cmd *qc) 261 { 262 struct ata_port *ap = qc->ap; 263 struct ahci_port_priv *pp = ap->private_data; 264 int is_atapi = ata_is_atapi(qc->tf.protocol); 265 void *cmd_tbl; 266 u32 opts; 267 const u32 cmd_fis_len = 5; /* five dwords */ 268 unsigned int n_elem; 269 270 /* 271 * Fill in command table information. First, the header, 272 * a SATA Register - Host to Device command FIS. 273 */ 274 cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ; 275 276 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl); 277 if (is_atapi) { 278 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32); 279 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len); 280 } 281 282 n_elem = 0; 283 if (qc->flags & ATA_QCFLAG_DMAMAP) 284 n_elem = acard_ahci_fill_sg(qc, cmd_tbl); 285 286 /* 287 * Fill in command slot information. 288 * 289 * ACard note: prd table length not filled in 290 */ 291 opts = cmd_fis_len | (qc->dev->link->pmp << 12); 292 if (qc->tf.flags & ATA_TFLAG_WRITE) 293 opts |= AHCI_CMD_WRITE; 294 if (is_atapi) 295 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH; 296 297 ahci_fill_cmd_slot(pp, qc->tag, opts); 298 } 299 300 static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc) 301 { 302 struct ahci_port_priv *pp = qc->ap->private_data; 303 u8 *rx_fis = pp->rx_fis; 304 305 if (pp->fbs_enabled) 306 rx_fis += qc->dev->link->pmp * ACARD_AHCI_RX_FIS_SZ; 307 308 /* 309 * After a successful execution of an ATA PIO data-in command, 310 * the device doesn't send D2H Reg FIS to update the TF and 311 * the host should take TF and E_Status from the preceding PIO 312 * Setup FIS. 313 */ 314 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE && 315 !(qc->flags & ATA_QCFLAG_FAILED)) { 316 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf); 317 qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15]; 318 } else 319 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf); 320 321 return true; 322 } 323 324 static int acard_ahci_port_start(struct ata_port *ap) 325 { 326 struct ahci_host_priv *hpriv = ap->host->private_data; 327 struct device *dev = ap->host->dev; 328 struct ahci_port_priv *pp; 329 void *mem; 330 dma_addr_t mem_dma; 331 size_t dma_sz, rx_fis_sz; 332 333 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL); 334 if (!pp) 335 return -ENOMEM; 336 337 /* check FBS capability */ 338 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) { 339 void __iomem *port_mmio = ahci_port_base(ap); 340 u32 cmd = readl(port_mmio + PORT_CMD); 341 if (cmd & PORT_CMD_FBSCP) 342 pp->fbs_supported = true; 343 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) { 344 dev_info(dev, "port %d can do FBS, forcing FBSCP\n", 345 ap->port_no); 346 pp->fbs_supported = true; 347 } else 348 dev_warn(dev, "port %d is not capable of FBS\n", 349 ap->port_no); 350 } 351 352 if (pp->fbs_supported) { 353 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ; 354 rx_fis_sz = ACARD_AHCI_RX_FIS_SZ * 16; 355 } else { 356 dma_sz = AHCI_PORT_PRIV_DMA_SZ; 357 rx_fis_sz = ACARD_AHCI_RX_FIS_SZ; 358 } 359 360 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL); 361 if (!mem) 362 return -ENOMEM; 363 memset(mem, 0, dma_sz); 364 365 /* 366 * First item in chunk of DMA memory: 32-slot command table, 367 * 32 bytes each in size 368 */ 369 pp->cmd_slot = mem; 370 pp->cmd_slot_dma = mem_dma; 371 372 mem += AHCI_CMD_SLOT_SZ; 373 mem_dma += AHCI_CMD_SLOT_SZ; 374 375 /* 376 * Second item: Received-FIS area 377 */ 378 pp->rx_fis = mem; 379 pp->rx_fis_dma = mem_dma; 380 381 mem += rx_fis_sz; 382 mem_dma += rx_fis_sz; 383 384 /* 385 * Third item: data area for storing a single command 386 * and its scatter-gather table 387 */ 388 pp->cmd_tbl = mem; 389 pp->cmd_tbl_dma = mem_dma; 390 391 /* 392 * Save off initial list of interrupts to be enabled. 393 * This could be changed later 394 */ 395 pp->intr_mask = DEF_PORT_IRQ; 396 397 ap->private_data = pp; 398 399 /* engage engines, captain */ 400 return ahci_port_resume(ap); 401 } 402 403 static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) 404 { 405 unsigned int board_id = ent->driver_data; 406 struct ata_port_info pi = acard_ahci_port_info[board_id]; 407 const struct ata_port_info *ppi[] = { &pi, NULL }; 408 struct device *dev = &pdev->dev; 409 struct ahci_host_priv *hpriv; 410 struct ata_host *host; 411 int n_ports, i, rc; 412 413 VPRINTK("ENTER\n"); 414 415 WARN_ON((int)ATA_MAX_QUEUE > AHCI_MAX_CMDS); 416 417 ata_print_version_once(&pdev->dev, DRV_VERSION); 418 419 /* acquire resources */ 420 rc = pcim_enable_device(pdev); 421 if (rc) 422 return rc; 423 424 /* AHCI controllers often implement SFF compatible interface. 425 * Grab all PCI BARs just in case. 426 */ 427 rc = pcim_iomap_regions_request_all(pdev, 1 << AHCI_PCI_BAR, DRV_NAME); 428 if (rc == -EBUSY) 429 pcim_pin_device(pdev); 430 if (rc) 431 return rc; 432 433 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL); 434 if (!hpriv) 435 return -ENOMEM; 436 437 hpriv->irq = pdev->irq; 438 hpriv->flags |= (unsigned long)pi.private_data; 439 440 if (!(hpriv->flags & AHCI_HFLAG_NO_MSI)) 441 pci_enable_msi(pdev); 442 443 hpriv->mmio = pcim_iomap_table(pdev)[AHCI_PCI_BAR]; 444 445 /* save initial config */ 446 ahci_save_initial_config(&pdev->dev, hpriv); 447 448 /* prepare host */ 449 if (hpriv->cap & HOST_CAP_NCQ) 450 pi.flags |= ATA_FLAG_NCQ; 451 452 if (hpriv->cap & HOST_CAP_PMP) 453 pi.flags |= ATA_FLAG_PMP; 454 455 ahci_set_em_messages(hpriv, &pi); 456 457 /* CAP.NP sometimes indicate the index of the last enabled 458 * port, at other times, that of the last possible port, so 459 * determining the maximum port number requires looking at 460 * both CAP.NP and port_map. 461 */ 462 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); 463 464 host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports); 465 if (!host) 466 return -ENOMEM; 467 host->private_data = hpriv; 468 469 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) 470 host->flags |= ATA_HOST_PARALLEL_SCAN; 471 else 472 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n"); 473 474 for (i = 0; i < host->n_ports; i++) { 475 struct ata_port *ap = host->ports[i]; 476 477 ata_port_pbar_desc(ap, AHCI_PCI_BAR, -1, "abar"); 478 ata_port_pbar_desc(ap, AHCI_PCI_BAR, 479 0x100 + ap->port_no * 0x80, "port"); 480 481 /* set initial link pm policy */ 482 /* 483 ap->pm_policy = NOT_AVAILABLE; 484 */ 485 /* disabled/not-implemented port */ 486 if (!(hpriv->port_map & (1 << i))) 487 ap->ops = &ata_dummy_port_ops; 488 } 489 490 /* initialize adapter */ 491 rc = acard_ahci_configure_dma_masks(pdev, hpriv->cap & HOST_CAP_64); 492 if (rc) 493 return rc; 494 495 rc = ahci_reset_controller(host); 496 if (rc) 497 return rc; 498 499 ahci_init_controller(host); 500 acard_ahci_pci_print_info(host); 501 502 pci_set_master(pdev); 503 return ahci_host_activate(host, &acard_ahci_sht); 504 } 505 506 module_pci_driver(acard_ahci_pci_driver); 507 508 MODULE_AUTHOR("Jeff Garzik"); 509 MODULE_DESCRIPTION("ACard AHCI SATA low-level driver"); 510 MODULE_LICENSE("GPL"); 511 MODULE_DEVICE_TABLE(pci, acard_ahci_pci_tbl); 512 MODULE_VERSION(DRV_VERSION); 513