1 /* 2 * ACPI PATA driver 3 * 4 * (c) 2007 Red Hat 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_sff_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_discover_modes - filter non ACPI modes 72 * @adev: ATA device 73 * @mask: proposed modes 74 * 75 * Try the modes available and see which ones the ACPI method will 76 * set up sensibly. From this we get a mask of ACPI modes we can use 77 */ 78 79 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev) 80 { 81 struct pata_acpi *acpi = ap->private_data; 82 struct ata_acpi_gtm probe; 83 unsigned int xfer_mask; 84 85 probe = acpi->gtm; 86 87 ata_acpi_gtm(ap, &probe); 88 89 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe); 90 91 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA)) 92 ap->cbl = ATA_CBL_PATA80; 93 94 return xfer_mask; 95 } 96 97 /** 98 * pacpi_mode_filter - mode filter for ACPI 99 * @adev: device 100 * @mask: mask of valid modes 101 * 102 * Filter the valid mode list according to our own specific rules, in 103 * this case the list of discovered valid modes obtained by ACPI probing 104 */ 105 106 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask) 107 { 108 struct pata_acpi *acpi = adev->link->ap->private_data; 109 return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]); 110 } 111 112 /** 113 * pacpi_set_piomode - set initial PIO mode data 114 * @ap: ATA interface 115 * @adev: ATA device 116 */ 117 118 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev) 119 { 120 int unit = adev->devno; 121 struct pata_acpi *acpi = ap->private_data; 122 const struct ata_timing *t; 123 124 if (!(acpi->gtm.flags & 0x10)) 125 unit = 0; 126 127 /* Now stuff the nS values into the structure */ 128 t = ata_timing_find_mode(adev->pio_mode); 129 acpi->gtm.drive[unit].pio = t->cycle; 130 ata_acpi_stm(ap, &acpi->gtm); 131 /* See what mode we actually got */ 132 ata_acpi_gtm(ap, &acpi->gtm); 133 } 134 135 /** 136 * pacpi_set_dmamode - set initial DMA mode data 137 * @ap: ATA interface 138 * @adev: ATA device 139 */ 140 141 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev) 142 { 143 int unit = adev->devno; 144 struct pata_acpi *acpi = ap->private_data; 145 const struct ata_timing *t; 146 147 if (!(acpi->gtm.flags & 0x10)) 148 unit = 0; 149 150 /* Now stuff the nS values into the structure */ 151 t = ata_timing_find_mode(adev->dma_mode); 152 if (adev->dma_mode >= XFER_UDMA_0) { 153 acpi->gtm.drive[unit].dma = t->udma; 154 acpi->gtm.flags |= (1 << (2 * unit)); 155 } else { 156 acpi->gtm.drive[unit].dma = t->cycle; 157 acpi->gtm.flags &= ~(1 << (2 * unit)); 158 } 159 ata_acpi_stm(ap, &acpi->gtm); 160 /* See what mode we actually got */ 161 ata_acpi_gtm(ap, &acpi->gtm); 162 } 163 164 /** 165 * pacpi_qc_issue - command issue 166 * @qc: command pending 167 * 168 * Called when the libata layer is about to issue a command. We wrap 169 * this interface so that we can load the correct ATA timings if 170 * neccessary. 171 */ 172 173 static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc) 174 { 175 struct ata_port *ap = qc->ap; 176 struct ata_device *adev = qc->dev; 177 struct pata_acpi *acpi = ap->private_data; 178 179 if (acpi->gtm.flags & 0x10) 180 return ata_sff_qc_issue(qc); 181 182 if (adev != acpi->last) { 183 pacpi_set_piomode(ap, adev); 184 if (ata_dma_enabled(adev)) 185 pacpi_set_dmamode(ap, adev); 186 acpi->last = adev; 187 } 188 return ata_sff_qc_issue(qc); 189 } 190 191 /** 192 * pacpi_port_start - port setup 193 * @ap: ATA port being set up 194 * 195 * Use the port_start hook to maintain private control structures 196 */ 197 198 static int pacpi_port_start(struct ata_port *ap) 199 { 200 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 201 struct pata_acpi *acpi; 202 203 int ret; 204 205 if (ap->acpi_handle == NULL) 206 return -ENODEV; 207 208 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL); 209 if (ap->private_data == NULL) 210 return -ENOMEM; 211 acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]); 212 acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]); 213 ret = ata_sff_port_start(ap); 214 if (ret < 0) 215 return ret; 216 217 return ret; 218 } 219 220 static struct scsi_host_template pacpi_sht = { 221 ATA_BMDMA_SHT(DRV_NAME), 222 }; 223 224 static struct ata_port_operations pacpi_ops = { 225 .inherits = &ata_bmdma_port_ops, 226 .qc_issue = pacpi_qc_issue, 227 .cable_detect = pacpi_cable_detect, 228 .mode_filter = pacpi_mode_filter, 229 .set_piomode = pacpi_set_piomode, 230 .set_dmamode = pacpi_set_dmamode, 231 .prereset = pacpi_pre_reset, 232 .port_start = pacpi_port_start, 233 }; 234 235 236 /** 237 * pacpi_init_one - Register ACPI ATA PCI device with kernel services 238 * @pdev: PCI device to register 239 * @ent: Entry in pacpi_pci_tbl matching with @pdev 240 * 241 * Called from kernel PCI layer. 242 * 243 * LOCKING: 244 * Inherited from PCI layer (may sleep). 245 * 246 * RETURNS: 247 * Zero on success, or -ERRNO value. 248 */ 249 250 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id) 251 { 252 static const struct ata_port_info info = { 253 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, 254 255 .pio_mask = 0x1f, 256 .mwdma_mask = 0x07, 257 .udma_mask = 0x7f, 258 259 .port_ops = &pacpi_ops, 260 }; 261 const struct ata_port_info *ppi[] = { &info, NULL }; 262 if (pdev->vendor == PCI_VENDOR_ID_ATI) { 263 int rc = pcim_enable_device(pdev); 264 if (rc < 0) 265 return rc; 266 pcim_pin_device(pdev); 267 } 268 return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL); 269 } 270 271 static const struct pci_device_id pacpi_pci_tbl[] = { 272 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1}, 273 { } /* terminate list */ 274 }; 275 276 static struct pci_driver pacpi_pci_driver = { 277 .name = DRV_NAME, 278 .id_table = pacpi_pci_tbl, 279 .probe = pacpi_init_one, 280 .remove = ata_pci_remove_one, 281 #ifdef CONFIG_PM 282 .suspend = ata_pci_device_suspend, 283 .resume = ata_pci_device_resume, 284 #endif 285 }; 286 287 static int __init pacpi_init(void) 288 { 289 return pci_register_driver(&pacpi_pci_driver); 290 } 291 292 static void __exit pacpi_exit(void) 293 { 294 pci_unregister_driver(&pacpi_pci_driver); 295 } 296 297 module_init(pacpi_init); 298 module_exit(pacpi_exit); 299 300 MODULE_AUTHOR("Alan Cox"); 301 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode"); 302 MODULE_LICENSE("GPL"); 303 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl); 304 MODULE_VERSION(DRV_VERSION); 305 306