drivers/ata/acard-ahci.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /*
   4  *  acard-ahci.c - ACard AHCI SATA support
   5  *
   6  *  Maintained by:  Tejun Heo <tj@kernel.org>
   7  *                  Please ALWAYS copy linux-ide@vger.kernel.org
   8  *                  on emails.
   9  *
  10  *  Copyright 2010 Red Hat, Inc.
  11  *
  12  * libata documentation is available via 'make {ps|pdf}docs',
  13  * as Documentation/driver-api/libata.rst
  14  *
  15  * AHCI hardware documentation:
  16  * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
  17  * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/delay.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/device.h>
  28 #include <linux/dmi.h>
  29 #include <linux/gfp.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_cmnd.h>
  32 #include <linux/libata.h>
  33 #include "ahci.h"
  34
  35 #define DRV_NAME        "acard-ahci"
  36 #define DRV_VERSION     "1.0"
  37
  38 /*
  39   Received FIS structure limited to 80h.
  40 */
  41
  42 #define ACARD_AHCI_RX_FIS_SZ 128
  43
  44 enum {
  45         AHCI_PCI_BAR            = 5,
  46 };
  47
  48 enum board_ids {
  49         board_acard_ahci,
  50 };
  51
  52 struct acard_sg {
  53         __le32                  addr;
  54         __le32                  addr_hi;
  55         __le32                  reserved;
  56         __le32                  size;    /* bit 31 (EOT) max==0x10000 (64k) */
  57 };
  58
  59 static void acard_ahci_qc_prep(struct ata_queued_cmd *qc);
  60 static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
  61 static int acard_ahci_port_start(struct ata_port *ap);
  62 static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
  63
  64 #ifdef CONFIG_PM_SLEEP
  65 static int acard_ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
  66 static int acard_ahci_pci_device_resume(struct pci_dev *pdev);
  67 #endif
  68
  69 static struct scsi_host_template acard_ahci_sht = {
  70         AHCI_SHT("acard-ahci"),
  71 };
  72
  73 static struct ata_port_operations acard_ops = {
  74         .inherits               = &ahci_ops,
  75         .qc_prep                = acard_ahci_qc_prep,
  76         .qc_fill_rtf            = acard_ahci_qc_fill_rtf,
  77         .port_start             = acard_ahci_port_start,
  78 };
  79
  80 #define AHCI_HFLAGS(flags)      .private_data   = (void *)(flags)
  81
  82 static const struct ata_port_info acard_ahci_port_info[] = {
  83         [board_acard_ahci] =
  84         {
  85                 AHCI_HFLAGS     (AHCI_HFLAG_NO_NCQ),
  86                 .flags          = AHCI_FLAG_COMMON,
  87                 .pio_mask       = ATA_PIO4,
  88                 .udma_mask      = ATA_UDMA6,
  89                 .port_ops       = &acard_ops,
  90         },
  91 };
  92
  93 static const struct pci_device_id acard_ahci_pci_tbl[] = {
  94         /* ACard */
  95         { PCI_VDEVICE(ARTOP, 0x000d), board_acard_ahci }, /* ATP8620 */
  96
  97         { }    /* terminate list */
  98 };
  99
 100 static struct pci_driver acard_ahci_pci_driver = {
 101         .name                   = DRV_NAME,
 102         .id_table               = acard_ahci_pci_tbl,
 103         .probe                  = acard_ahci_init_one,
 104         .remove                 = ata_pci_remove_one,
 105 #ifdef CONFIG_PM_SLEEP
 106         .suspend                = acard_ahci_pci_device_suspend,
 107         .resume                 = acard_ahci_pci_device_resume,
 108 #endif
 109 };
 110
 111 #ifdef CONFIG_PM_SLEEP
 112 static int acard_ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
 113 {
 114         struct ata_host *host = pci_get_drvdata(pdev);
 115         struct ahci_host_priv *hpriv = host->private_data;
 116         void __iomem *mmio = hpriv->mmio;
 117         u32 ctl;
 118
 119         if (mesg.event & PM_EVENT_SUSPEND &&
 120             hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 121                 dev_err(&pdev->dev,
 122                         "BIOS update required for suspend/resume\n");
 123                 return -EIO;
 124         }
 125
 126         if (mesg.event & PM_EVENT_SLEEP) {
 127                 /* AHCI spec rev1.1 section 8.3.3:
 128                  * Software must disable interrupts prior to requesting a
 129                  * transition of the HBA to D3 state.
 130                  */
 131                 ctl = readl(mmio + HOST_CTL);
 132                 ctl &= ~HOST_IRQ_EN;
 133                 writel(ctl, mmio + HOST_CTL);
 134                 readl(mmio + HOST_CTL); /* flush */
 135         }
 136
 137         return ata_pci_device_suspend(pdev, mesg);
 138 }
 139
 140 static int acard_ahci_pci_device_resume(struct pci_dev *pdev)
 141 {
 142         struct ata_host *host = pci_get_drvdata(pdev);
 143         int rc;
 144
 145         rc = ata_pci_device_do_resume(pdev);
 146         if (rc)
 147                 return rc;
 148
 149         if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
 150                 rc = ahci_reset_controller(host);
 151                 if (rc)
 152                         return rc;
 153
 154                 ahci_init_controller(host);
 155         }
 156
 157         ata_host_resume(host);
 158
 159         return 0;
 160 }
 161 #endif
 162
 163 static void acard_ahci_pci_print_info(struct ata_host *host)
 164 {
 165         struct pci_dev *pdev = to_pci_dev(host->dev);
 166         u16 cc;
 167         const char *scc_s;
 168
 169         pci_read_config_word(pdev, 0x0a, &cc);
 170         if (cc == PCI_CLASS_STORAGE_IDE)
 171                 scc_s = "IDE";
 172         else if (cc == PCI_CLASS_STORAGE_SATA)
 173                 scc_s = "SATA";
 174         else if (cc == PCI_CLASS_STORAGE_RAID)
 175                 scc_s = "RAID";
 176         else
 177                 scc_s = "unknown";
 178
 179         ahci_print_info(host, scc_s);
 180 }
 181
 182 static unsigned int acard_ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
 183 {
 184         struct scatterlist *sg;
 185         struct acard_sg *acard_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
 186         unsigned int si, last_si = 0;
 187
 188         VPRINTK("ENTER\n");
 189
 190         /*
 191          * Next, the S/G list.
 192          */
 193         for_each_sg(qc->sg, sg, qc->n_elem, si) {
 194                 dma_addr_t addr = sg_dma_address(sg);
 195                 u32 sg_len = sg_dma_len(sg);
 196
 197                 /*
 198                  * ACard note:
 199                  * We must set an end-of-table (EOT) bit,
 200                  * and the segment cannot exceed 64k (0x10000)
 201                  */
 202                 acard_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
 203                 acard_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
 204                 acard_sg[si].size = cpu_to_le32(sg_len);
 205                 last_si = si;
 206         }
 207
 208         acard_sg[last_si].size |= cpu_to_le32(1 << 31); /* set EOT */
 209
 210         return si;
 211 }
 212
 213 static void acard_ahci_qc_prep(struct ata_queued_cmd *qc)
 214 {
 215         struct ata_port *ap = qc->ap;
 216         struct ahci_port_priv *pp = ap->private_data;
 217         int is_atapi = ata_is_atapi(qc->tf.protocol);
 218         void *cmd_tbl;
 219         u32 opts;
 220         const u32 cmd_fis_len = 5; /* five dwords */
 221         unsigned int n_elem;
 222
 223         /*
 224          * Fill in command table information.  First, the header,
 225          * a SATA Register - Host to Device command FIS.
 226          */
 227         cmd_tbl = pp->cmd_tbl + qc->hw_tag * AHCI_CMD_TBL_SZ;
 228
 229         ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
 230         if (is_atapi) {
 231                 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
 232                 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
 233         }
 234
 235         n_elem = 0;
 236         if (qc->flags & ATA_QCFLAG_DMAMAP)
 237                 n_elem = acard_ahci_fill_sg(qc, cmd_tbl);
 238
 239         /*
 240          * Fill in command slot information.
 241          *
 242          * ACard note: prd table length not filled in
 243          */
 244         opts = cmd_fis_len | (qc->dev->link->pmp << 12);
 245         if (qc->tf.flags & ATA_TFLAG_WRITE)
 246                 opts |= AHCI_CMD_WRITE;
 247         if (is_atapi)
 248                 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
 249
 250         ahci_fill_cmd_slot(pp, qc->hw_tag, opts);
 251 }
 252
 253 static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
 254 {
 255         struct ahci_port_priv *pp = qc->ap->private_data;
 256         u8 *rx_fis = pp->rx_fis;
 257
 258         if (pp->fbs_enabled)
 259                 rx_fis += qc->dev->link->pmp * ACARD_AHCI_RX_FIS_SZ;
 260
 261         /*
 262          * After a successful execution of an ATA PIO data-in command,
 263          * the device doesn't send D2H Reg FIS to update the TF and
 264          * the host should take TF and E_Status from the preceding PIO
 265          * Setup FIS.
 266          */
 267         if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
 268             !(qc->flags & ATA_QCFLAG_FAILED)) {
 269                 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
 270                 qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
 271         } else
 272                 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
 273
 274         return true;
 275 }
 276
 277 static int acard_ahci_port_start(struct ata_port *ap)
 278 {
 279         struct ahci_host_priv *hpriv = ap->host->private_data;
 280         struct device *dev = ap->host->dev;
 281         struct ahci_port_priv *pp;
 282         void *mem;
 283         dma_addr_t mem_dma;
 284         size_t dma_sz, rx_fis_sz;
 285
 286         pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
 287         if (!pp)
 288                 return -ENOMEM;
 289
 290         /* check FBS capability */
 291         if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
 292                 void __iomem *port_mmio = ahci_port_base(ap);
 293                 u32 cmd = readl(port_mmio + PORT_CMD);
 294                 if (cmd & PORT_CMD_FBSCP)
 295                         pp->fbs_supported = true;
 296                 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
 297                         dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
 298                                  ap->port_no);
 299                         pp->fbs_supported = true;
 300                 } else
 301                         dev_warn(dev, "port %d is not capable of FBS\n",
 302                                  ap->port_no);
 303         }
 304
 305         if (pp->fbs_supported) {
 306                 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
 307                 rx_fis_sz = ACARD_AHCI_RX_FIS_SZ * 16;
 308         } else {
 309                 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
 310                 rx_fis_sz = ACARD_AHCI_RX_FIS_SZ;
 311         }
 312
 313         mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
 314         if (!mem)
 315                 return -ENOMEM;
 316
 317         /*
 318          * First item in chunk of DMA memory: 32-slot command table,
 319          * 32 bytes each in size
 320          */
 321         pp->cmd_slot = mem;
 322         pp->cmd_slot_dma = mem_dma;
 323
 324         mem += AHCI_CMD_SLOT_SZ;
 325         mem_dma += AHCI_CMD_SLOT_SZ;
 326
 327         /*
 328          * Second item: Received-FIS area
 329          */
 330         pp->rx_fis = mem;
 331         pp->rx_fis_dma = mem_dma;
 332
 333         mem += rx_fis_sz;
 334         mem_dma += rx_fis_sz;
 335
 336         /*
 337          * Third item: data area for storing a single command
 338          * and its scatter-gather table
 339          */
 340         pp->cmd_tbl = mem;
 341         pp->cmd_tbl_dma = mem_dma;
 342
 343         /*
 344          * Save off initial list of interrupts to be enabled.
 345          * This could be changed later
 346          */
 347         pp->intr_mask = DEF_PORT_IRQ;
 348
 349         ap->private_data = pp;
 350
 351         /* engage engines, captain */
 352         return ahci_port_resume(ap);
 353 }
 354
 355 static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 356 {
 357         unsigned int board_id = ent->driver_data;
 358         struct ata_port_info pi = acard_ahci_port_info[board_id];
 359         const struct ata_port_info *ppi[] = { &pi, NULL };
 360         struct device *dev = &pdev->dev;
 361         struct ahci_host_priv *hpriv;
 362         struct ata_host *host;
 363         int n_ports, i, rc;
 364
 365         VPRINTK("ENTER\n");
 366
 367         WARN_ON((int)ATA_MAX_QUEUE > AHCI_MAX_CMDS);
 368
 369         ata_print_version_once(&pdev->dev, DRV_VERSION);
 370
 371         /* acquire resources */
 372         rc = pcim_enable_device(pdev);
 373         if (rc)
 374                 return rc;
 375
 376         /* AHCI controllers often implement SFF compatible interface.
 377          * Grab all PCI BARs just in case.
 378          */
 379         rc = pcim_iomap_regions_request_all(pdev, 1 << AHCI_PCI_BAR, DRV_NAME);
 380         if (rc == -EBUSY)
 381                 pcim_pin_device(pdev);
 382         if (rc)
 383                 return rc;
 384
 385         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 386         if (!hpriv)
 387                 return -ENOMEM;
 388
 389         hpriv->irq = pdev->irq;
 390         hpriv->flags |= (unsigned long)pi.private_data;
 391
 392         if (!(hpriv->flags & AHCI_HFLAG_NO_MSI))
 393                 pci_enable_msi(pdev);
 394
 395         hpriv->mmio = pcim_iomap_table(pdev)[AHCI_PCI_BAR];
 396
 397         /* save initial config */
 398         ahci_save_initial_config(&pdev->dev, hpriv);
 399
 400         /* prepare host */
 401         if (hpriv->cap & HOST_CAP_NCQ)
 402                 pi.flags |= ATA_FLAG_NCQ;
 403
 404         if (hpriv->cap & HOST_CAP_PMP)
 405                 pi.flags |= ATA_FLAG_PMP;
 406
 407         ahci_set_em_messages(hpriv, &pi);
 408
 409         /* CAP.NP sometimes indicate the index of the last enabled
 410          * port, at other times, that of the last possible port, so
 411          * determining the maximum port number requires looking at
 412          * both CAP.NP and port_map.
 413          */
 414         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 415
 416         host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
 417         if (!host)
 418                 return -ENOMEM;
 419         host->private_data = hpriv;
 420
 421         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 422                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 423         else
 424                 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
 425
 426         for (i = 0; i < host->n_ports; i++) {
 427                 struct ata_port *ap = host->ports[i];
 428
 429                 ata_port_pbar_desc(ap, AHCI_PCI_BAR, -1, "abar");
 430                 ata_port_pbar_desc(ap, AHCI_PCI_BAR,
 431                                    0x100 + ap->port_no * 0x80, "port");
 432
 433                 /* set initial link pm policy */
 434                 /*
 435                 ap->pm_policy = NOT_AVAILABLE;
 436                 */
 437                 /* disabled/not-implemented port */
 438                 if (!(hpriv->port_map & (1 << i)))
 439                         ap->ops = &ata_dummy_port_ops;
 440         }
 441
 442         /* initialize adapter */
 443         rc = dma_set_mask_and_coherent(&pdev->dev,
 444                         DMA_BIT_MASK((hpriv->cap & HOST_CAP_64) ? 64 : 32));
 445         if (rc) {
 446                 dev_err(&pdev->dev, "DMA enable failed\n");
 447                 return rc;
 448         }
 449
 450         rc = ahci_reset_controller(host);
 451         if (rc)
 452                 return rc;
 453
 454         ahci_init_controller(host);
 455         acard_ahci_pci_print_info(host);
 456
 457         pci_set_master(pdev);
 458         return ahci_host_activate(host, &acard_ahci_sht);
 459 }
 460
 461 module_pci_driver(acard_ahci_pci_driver);
 462
 463 MODULE_AUTHOR("Jeff Garzik");
 464 MODULE_DESCRIPTION("ACard AHCI SATA low-level driver");
 465 MODULE_LICENSE("GPL");
 466 MODULE_DEVICE_TABLE(pci, acard_ahci_pci_tbl);
 467 MODULE_VERSION(DRV_VERSION);