1 /* 2 * ACPI PATA driver 3 * 4 * (c) 2007 Red Hat <alan@redhat.com> 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/module.h> 9 #include <linux/pci.h> 10 #include <linux/init.h> 11 #include <linux/blkdev.h> 12 #include <linux/delay.h> 13 #include <linux/device.h> 14 #include <scsi/scsi_host.h> 15 #include <acpi/acpi_bus.h> 16 #include <acpi/acnames.h> 17 #include <acpi/acnamesp.h> 18 #include <acpi/acparser.h> 19 #include <acpi/acexcep.h> 20 #include <acpi/acmacros.h> 21 #include <acpi/actypes.h> 22 23 #include <linux/libata.h> 24 #include <linux/ata.h> 25 26 #define DRV_NAME "pata_acpi" 27 #define DRV_VERSION "0.2.3" 28 29 struct pata_acpi { 30 struct ata_acpi_gtm gtm; 31 void *last; 32 unsigned long mask[2]; 33 }; 34 35 /** 36 * pacpi_pre_reset - check for 40/80 pin 37 * @ap: Port 38 * @deadline: deadline jiffies for the operation 39 * 40 * Perform the PATA port setup we need. 41 */ 42 43 static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline) 44 { 45 struct ata_port *ap = link->ap; 46 struct pata_acpi *acpi = ap->private_data; 47 if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0) 48 return -ENODEV; 49 50 return ata_std_prereset(link, deadline); 51 } 52 53 /** 54 * pacpi_cable_detect - cable type detection 55 * @ap: port to detect 56 * 57 * Perform device specific cable detection 58 */ 59 60 static int pacpi_cable_detect(struct ata_port *ap) 61 { 62 struct pata_acpi *acpi = ap->private_data; 63 64 if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA)) 65 return ATA_CBL_PATA80; 66 else 67 return ATA_CBL_PATA40; 68 } 69 70 /** 71 * pacpi_error_handler - Setup and error handler 72 * @ap: Port to handle 73 * 74 * LOCKING: 75 * None (inherited from caller). 76 */ 77 78 static void pacpi_error_handler(struct ata_port *ap) 79 { 80 return ata_bmdma_drive_eh(ap, pacpi_pre_reset, ata_std_softreset, 81 NULL, ata_std_postreset); 82 } 83 84 /** 85 * pacpi_discover_modes - filter non ACPI modes 86 * @adev: ATA device 87 * @mask: proposed modes 88 * 89 * Try the modes available and see which ones the ACPI method will 90 * set up sensibly. From this we get a mask of ACPI modes we can use 91 */ 92 93 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev) 94 { 95 struct pata_acpi *acpi = ap->private_data; 96 struct ata_acpi_gtm probe; 97 unsigned int xfer_mask; 98 99 probe = acpi->gtm; 100 101 ata_acpi_gtm(ap, &probe); 102 103 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe); 104 105 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA)) 106 ap->cbl = ATA_CBL_PATA80; 107 108 return xfer_mask; 109 } 110 111 /** 112 * pacpi_mode_filter - mode filter for ACPI 113 * @adev: device 114 * @mask: mask of valid modes 115 * 116 * Filter the valid mode list according to our own specific rules, in 117 * this case the list of discovered valid modes obtained by ACPI probing 118 */ 119 120 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask) 121 { 122 struct pata_acpi *acpi = adev->link->ap->private_data; 123 return ata_pci_default_filter(adev, mask & acpi->mask[adev->devno]); 124 } 125 126 /** 127 * pacpi_set_piomode - set initial PIO mode data 128 * @ap: ATA interface 129 * @adev: ATA device 130 */ 131 132 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev) 133 { 134 int unit = adev->devno; 135 struct pata_acpi *acpi = ap->private_data; 136 const struct ata_timing *t; 137 138 if (!(acpi->gtm.flags & 0x10)) 139 unit = 0; 140 141 /* Now stuff the nS values into the structure */ 142 t = ata_timing_find_mode(adev->pio_mode); 143 acpi->gtm.drive[unit].pio = t->cycle; 144 ata_acpi_stm(ap, &acpi->gtm); 145 /* See what mode we actually got */ 146 ata_acpi_gtm(ap, &acpi->gtm); 147 } 148 149 /** 150 * pacpi_set_dmamode - set initial DMA mode data 151 * @ap: ATA interface 152 * @adev: ATA device 153 */ 154 155 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev) 156 { 157 int unit = adev->devno; 158 struct pata_acpi *acpi = ap->private_data; 159 const struct ata_timing *t; 160 161 if (!(acpi->gtm.flags & 0x10)) 162 unit = 0; 163 164 /* Now stuff the nS values into the structure */ 165 t = ata_timing_find_mode(adev->dma_mode); 166 if (adev->dma_mode >= XFER_UDMA_0) { 167 acpi->gtm.drive[unit].dma = t->udma; 168 acpi->gtm.flags |= (1 << (2 * unit)); 169 } else { 170 acpi->gtm.drive[unit].dma = t->cycle; 171 acpi->gtm.flags &= ~(1 << (2 * unit)); 172 } 173 ata_acpi_stm(ap, &acpi->gtm); 174 /* See what mode we actually got */ 175 ata_acpi_gtm(ap, &acpi->gtm); 176 } 177 178 /** 179 * pacpi_qc_issue_prot - command issue 180 * @qc: command pending 181 * 182 * Called when the libata layer is about to issue a command. We wrap 183 * this interface so that we can load the correct ATA timings if 184 * neccessary. 185 */ 186 187 static unsigned int pacpi_qc_issue_prot(struct ata_queued_cmd *qc) 188 { 189 struct ata_port *ap = qc->ap; 190 struct ata_device *adev = qc->dev; 191 struct pata_acpi *acpi = ap->private_data; 192 193 if (acpi->gtm.flags & 0x10) 194 return ata_qc_issue_prot(qc); 195 196 if (adev != acpi->last) { 197 pacpi_set_piomode(ap, adev); 198 if (adev->dma_mode) 199 pacpi_set_dmamode(ap, adev); 200 acpi->last = adev; 201 } 202 return ata_qc_issue_prot(qc); 203 } 204 205 /** 206 * pacpi_port_start - port setup 207 * @ap: ATA port being set up 208 * 209 * Use the port_start hook to maintain private control structures 210 */ 211 212 static int pacpi_port_start(struct ata_port *ap) 213 { 214 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 215 struct pata_acpi *acpi; 216 217 int ret; 218 219 if (ap->acpi_handle == NULL) 220 return -ENODEV; 221 222 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL); 223 if (ap->private_data == NULL) 224 return -ENOMEM; 225 acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]); 226 acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]); 227 ret = ata_sff_port_start(ap); 228 if (ret < 0) 229 return ret; 230 231 return ret; 232 } 233 234 static struct scsi_host_template pacpi_sht = { 235 .module = THIS_MODULE, 236 .name = DRV_NAME, 237 .ioctl = ata_scsi_ioctl, 238 .queuecommand = ata_scsi_queuecmd, 239 .can_queue = ATA_DEF_QUEUE, 240 .this_id = ATA_SHT_THIS_ID, 241 .sg_tablesize = LIBATA_MAX_PRD, 242 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 243 .emulated = ATA_SHT_EMULATED, 244 .use_clustering = ATA_SHT_USE_CLUSTERING, 245 .proc_name = DRV_NAME, 246 .dma_boundary = ATA_DMA_BOUNDARY, 247 .slave_configure = ata_scsi_slave_config, 248 .slave_destroy = ata_scsi_slave_destroy, 249 /* Use standard CHS mapping rules */ 250 .bios_param = ata_std_bios_param, 251 }; 252 253 static const struct ata_port_operations pacpi_ops = { 254 .set_piomode = pacpi_set_piomode, 255 .set_dmamode = pacpi_set_dmamode, 256 .mode_filter = pacpi_mode_filter, 257 258 /* Task file is PCI ATA format, use helpers */ 259 .tf_load = ata_tf_load, 260 .tf_read = ata_tf_read, 261 .check_status = ata_check_status, 262 .exec_command = ata_exec_command, 263 .dev_select = ata_std_dev_select, 264 265 .freeze = ata_bmdma_freeze, 266 .thaw = ata_bmdma_thaw, 267 .error_handler = pacpi_error_handler, 268 .post_internal_cmd = ata_bmdma_post_internal_cmd, 269 .cable_detect = pacpi_cable_detect, 270 271 /* BMDMA handling is PCI ATA format, use helpers */ 272 .bmdma_setup = ata_bmdma_setup, 273 .bmdma_start = ata_bmdma_start, 274 .bmdma_stop = ata_bmdma_stop, 275 .bmdma_status = ata_bmdma_status, 276 .qc_prep = ata_qc_prep, 277 .qc_issue = pacpi_qc_issue_prot, 278 .data_xfer = ata_data_xfer, 279 280 /* Timeout handling */ 281 .irq_handler = ata_interrupt, 282 .irq_clear = ata_bmdma_irq_clear, 283 .irq_on = ata_irq_on, 284 285 /* Generic PATA PCI ATA helpers */ 286 .port_start = pacpi_port_start, 287 }; 288 289 290 /** 291 * pacpi_init_one - Register ACPI ATA PCI device with kernel services 292 * @pdev: PCI device to register 293 * @ent: Entry in pacpi_pci_tbl matching with @pdev 294 * 295 * Called from kernel PCI layer. 296 * 297 * LOCKING: 298 * Inherited from PCI layer (may sleep). 299 * 300 * RETURNS: 301 * Zero on success, or -ERRNO value. 302 */ 303 304 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id) 305 { 306 static const struct ata_port_info info = { 307 .sht = &pacpi_sht, 308 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, 309 310 .pio_mask = 0x1f, 311 .mwdma_mask = 0x07, 312 .udma_mask = 0x7f, 313 314 .port_ops = &pacpi_ops, 315 }; 316 const struct ata_port_info *ppi[] = { &info, NULL }; 317 return ata_pci_init_one(pdev, ppi); 318 } 319 320 static const struct pci_device_id pacpi_pci_tbl[] = { 321 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1}, 322 { } /* terminate list */ 323 }; 324 325 static struct pci_driver pacpi_pci_driver = { 326 .name = DRV_NAME, 327 .id_table = pacpi_pci_tbl, 328 .probe = pacpi_init_one, 329 .remove = ata_pci_remove_one, 330 #ifdef CONFIG_PM 331 .suspend = ata_pci_device_suspend, 332 .resume = ata_pci_device_resume, 333 #endif 334 }; 335 336 static int __init pacpi_init(void) 337 { 338 return pci_register_driver(&pacpi_pci_driver); 339 } 340 341 static void __exit pacpi_exit(void) 342 { 343 pci_unregister_driver(&pacpi_pci_driver); 344 } 345 346 module_init(pacpi_init); 347 module_exit(pacpi_exit); 348 349 MODULE_AUTHOR("Alan Cox"); 350 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode"); 351 MODULE_LICENSE("GPL"); 352 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl); 353 MODULE_VERSION(DRV_VERSION); 354 355