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 17 #include <linux/libata.h> 18 #include <linux/ata.h> 19 20 #define DRV_NAME "pata_acpi" 21 #define DRV_VERSION "0.2.3" 22 23 struct pata_acpi { 24 struct ata_acpi_gtm gtm; 25 void *last; 26 unsigned long mask[2]; 27 }; 28 29 /** 30 * pacpi_pre_reset - check for 40/80 pin 31 * @ap: Port 32 * @deadline: deadline jiffies for the operation 33 * 34 * Perform the PATA port setup we need. 35 */ 36 37 static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline) 38 { 39 struct ata_port *ap = link->ap; 40 struct pata_acpi *acpi = ap->private_data; 41 if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0) 42 return -ENODEV; 43 44 return ata_sff_prereset(link, deadline); 45 } 46 47 /** 48 * pacpi_cable_detect - cable type detection 49 * @ap: port to detect 50 * 51 * Perform device specific cable detection 52 */ 53 54 static int pacpi_cable_detect(struct ata_port *ap) 55 { 56 struct pata_acpi *acpi = ap->private_data; 57 58 if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA)) 59 return ATA_CBL_PATA80; 60 else 61 return ATA_CBL_PATA40; 62 } 63 64 /** 65 * pacpi_discover_modes - filter non ACPI modes 66 * @adev: ATA device 67 * @mask: proposed modes 68 * 69 * Try the modes available and see which ones the ACPI method will 70 * set up sensibly. From this we get a mask of ACPI modes we can use 71 */ 72 73 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev) 74 { 75 struct pata_acpi *acpi = ap->private_data; 76 struct ata_acpi_gtm probe; 77 unsigned int xfer_mask; 78 79 probe = acpi->gtm; 80 81 ata_acpi_gtm(ap, &probe); 82 83 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe); 84 85 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA)) 86 ap->cbl = ATA_CBL_PATA80; 87 88 return xfer_mask; 89 } 90 91 /** 92 * pacpi_mode_filter - mode filter for ACPI 93 * @adev: device 94 * @mask: mask of valid modes 95 * 96 * Filter the valid mode list according to our own specific rules, in 97 * this case the list of discovered valid modes obtained by ACPI probing 98 */ 99 100 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask) 101 { 102 struct pata_acpi *acpi = adev->link->ap->private_data; 103 return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]); 104 } 105 106 /** 107 * pacpi_set_piomode - set initial PIO mode data 108 * @ap: ATA interface 109 * @adev: ATA device 110 */ 111 112 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev) 113 { 114 int unit = adev->devno; 115 struct pata_acpi *acpi = ap->private_data; 116 const struct ata_timing *t; 117 118 if (!(acpi->gtm.flags & 0x10)) 119 unit = 0; 120 121 /* Now stuff the nS values into the structure */ 122 t = ata_timing_find_mode(adev->pio_mode); 123 acpi->gtm.drive[unit].pio = t->cycle; 124 ata_acpi_stm(ap, &acpi->gtm); 125 /* See what mode we actually got */ 126 ata_acpi_gtm(ap, &acpi->gtm); 127 } 128 129 /** 130 * pacpi_set_dmamode - set initial DMA mode data 131 * @ap: ATA interface 132 * @adev: ATA device 133 */ 134 135 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev) 136 { 137 int unit = adev->devno; 138 struct pata_acpi *acpi = ap->private_data; 139 const struct ata_timing *t; 140 141 if (!(acpi->gtm.flags & 0x10)) 142 unit = 0; 143 144 /* Now stuff the nS values into the structure */ 145 t = ata_timing_find_mode(adev->dma_mode); 146 if (adev->dma_mode >= XFER_UDMA_0) { 147 acpi->gtm.drive[unit].dma = t->udma; 148 acpi->gtm.flags |= (1 << (2 * unit)); 149 } else { 150 acpi->gtm.drive[unit].dma = t->cycle; 151 acpi->gtm.flags &= ~(1 << (2 * unit)); 152 } 153 ata_acpi_stm(ap, &acpi->gtm); 154 /* See what mode we actually got */ 155 ata_acpi_gtm(ap, &acpi->gtm); 156 } 157 158 /** 159 * pacpi_qc_issue - command issue 160 * @qc: command pending 161 * 162 * Called when the libata layer is about to issue a command. We wrap 163 * this interface so that we can load the correct ATA timings if 164 * neccessary. 165 */ 166 167 static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc) 168 { 169 struct ata_port *ap = qc->ap; 170 struct ata_device *adev = qc->dev; 171 struct pata_acpi *acpi = ap->private_data; 172 173 if (acpi->gtm.flags & 0x10) 174 return ata_sff_qc_issue(qc); 175 176 if (adev != acpi->last) { 177 pacpi_set_piomode(ap, adev); 178 if (ata_dma_enabled(adev)) 179 pacpi_set_dmamode(ap, adev); 180 acpi->last = adev; 181 } 182 return ata_sff_qc_issue(qc); 183 } 184 185 /** 186 * pacpi_port_start - port setup 187 * @ap: ATA port being set up 188 * 189 * Use the port_start hook to maintain private control structures 190 */ 191 192 static int pacpi_port_start(struct ata_port *ap) 193 { 194 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 195 struct pata_acpi *acpi; 196 197 int ret; 198 199 if (ap->acpi_handle == NULL) 200 return -ENODEV; 201 202 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL); 203 if (ap->private_data == NULL) 204 return -ENOMEM; 205 acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]); 206 acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]); 207 ret = ata_sff_port_start(ap); 208 if (ret < 0) 209 return ret; 210 211 return ret; 212 } 213 214 static struct scsi_host_template pacpi_sht = { 215 ATA_BMDMA_SHT(DRV_NAME), 216 }; 217 218 static struct ata_port_operations pacpi_ops = { 219 .inherits = &ata_bmdma_port_ops, 220 .qc_issue = pacpi_qc_issue, 221 .cable_detect = pacpi_cable_detect, 222 .mode_filter = pacpi_mode_filter, 223 .set_piomode = pacpi_set_piomode, 224 .set_dmamode = pacpi_set_dmamode, 225 .prereset = pacpi_pre_reset, 226 .port_start = pacpi_port_start, 227 }; 228 229 230 /** 231 * pacpi_init_one - Register ACPI ATA PCI device with kernel services 232 * @pdev: PCI device to register 233 * @ent: Entry in pacpi_pci_tbl matching with @pdev 234 * 235 * Called from kernel PCI layer. 236 * 237 * LOCKING: 238 * Inherited from PCI layer (may sleep). 239 * 240 * RETURNS: 241 * Zero on success, or -ERRNO value. 242 */ 243 244 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id) 245 { 246 static const struct ata_port_info info = { 247 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, 248 249 .pio_mask = ATA_PIO4, 250 .mwdma_mask = ATA_MWDMA2, 251 .udma_mask = ATA_UDMA6, 252 253 .port_ops = &pacpi_ops, 254 }; 255 const struct ata_port_info *ppi[] = { &info, NULL }; 256 if (pdev->vendor == PCI_VENDOR_ID_ATI) { 257 int rc = pcim_enable_device(pdev); 258 if (rc < 0) 259 return rc; 260 pcim_pin_device(pdev); 261 } 262 return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL); 263 } 264 265 static const struct pci_device_id pacpi_pci_tbl[] = { 266 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1}, 267 { } /* terminate list */ 268 }; 269 270 static struct pci_driver pacpi_pci_driver = { 271 .name = DRV_NAME, 272 .id_table = pacpi_pci_tbl, 273 .probe = pacpi_init_one, 274 .remove = ata_pci_remove_one, 275 #ifdef CONFIG_PM 276 .suspend = ata_pci_device_suspend, 277 .resume = ata_pci_device_resume, 278 #endif 279 }; 280 281 static int __init pacpi_init(void) 282 { 283 return pci_register_driver(&pacpi_pci_driver); 284 } 285 286 static void __exit pacpi_exit(void) 287 { 288 pci_unregister_driver(&pacpi_pci_driver); 289 } 290 291 module_init(pacpi_init); 292 module_exit(pacpi_exit); 293 294 MODULE_AUTHOR("Alan Cox"); 295 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode"); 296 MODULE_LICENSE("GPL"); 297 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl); 298 MODULE_VERSION(DRV_VERSION); 299 300