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 <linux/gfp.h> 15 #include <scsi/scsi_host.h> 16 #include <acpi/acpi_bus.h> 17 18 #include <linux/libata.h> 19 #include <linux/ata.h> 20 21 #define DRV_NAME "pata_acpi" 22 #define DRV_VERSION "0.2.3" 23 24 struct pata_acpi { 25 struct ata_acpi_gtm gtm; 26 void *last; 27 unsigned long mask[2]; 28 }; 29 30 /** 31 * pacpi_pre_reset - check for 40/80 pin 32 * @ap: Port 33 * @deadline: deadline jiffies for the operation 34 * 35 * Perform the PATA port setup we need. 36 */ 37 38 static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline) 39 { 40 struct ata_port *ap = link->ap; 41 struct pata_acpi *acpi = ap->private_data; 42 if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0) 43 return -ENODEV; 44 45 return ata_sff_prereset(link, deadline); 46 } 47 48 /** 49 * pacpi_cable_detect - cable type detection 50 * @ap: port to detect 51 * 52 * Perform device specific cable detection 53 */ 54 55 static int pacpi_cable_detect(struct ata_port *ap) 56 { 57 struct pata_acpi *acpi = ap->private_data; 58 59 if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA)) 60 return ATA_CBL_PATA80; 61 else 62 return ATA_CBL_PATA40; 63 } 64 65 /** 66 * pacpi_discover_modes - filter non ACPI modes 67 * @adev: ATA device 68 * @mask: proposed modes 69 * 70 * Try the modes available and see which ones the ACPI method will 71 * set up sensibly. From this we get a mask of ACPI modes we can use 72 */ 73 74 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev) 75 { 76 struct pata_acpi *acpi = ap->private_data; 77 struct ata_acpi_gtm probe; 78 unsigned int xfer_mask; 79 80 probe = acpi->gtm; 81 82 ata_acpi_gtm(ap, &probe); 83 84 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe); 85 86 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA)) 87 ap->cbl = ATA_CBL_PATA80; 88 89 return xfer_mask; 90 } 91 92 /** 93 * pacpi_mode_filter - mode filter for ACPI 94 * @adev: device 95 * @mask: mask of valid modes 96 * 97 * Filter the valid mode list according to our own specific rules, in 98 * this case the list of discovered valid modes obtained by ACPI probing 99 */ 100 101 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask) 102 { 103 struct pata_acpi *acpi = adev->link->ap->private_data; 104 return mask & acpi->mask[adev->devno]; 105 } 106 107 /** 108 * pacpi_set_piomode - set initial PIO mode data 109 * @ap: ATA interface 110 * @adev: ATA device 111 */ 112 113 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev) 114 { 115 int unit = adev->devno; 116 struct pata_acpi *acpi = ap->private_data; 117 const struct ata_timing *t; 118 119 if (!(acpi->gtm.flags & 0x10)) 120 unit = 0; 121 122 /* Now stuff the nS values into the structure */ 123 t = ata_timing_find_mode(adev->pio_mode); 124 acpi->gtm.drive[unit].pio = t->cycle; 125 ata_acpi_stm(ap, &acpi->gtm); 126 /* See what mode we actually got */ 127 ata_acpi_gtm(ap, &acpi->gtm); 128 } 129 130 /** 131 * pacpi_set_dmamode - set initial DMA mode data 132 * @ap: ATA interface 133 * @adev: ATA device 134 */ 135 136 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev) 137 { 138 int unit = adev->devno; 139 struct pata_acpi *acpi = ap->private_data; 140 const struct ata_timing *t; 141 142 if (!(acpi->gtm.flags & 0x10)) 143 unit = 0; 144 145 /* Now stuff the nS values into the structure */ 146 t = ata_timing_find_mode(adev->dma_mode); 147 if (adev->dma_mode >= XFER_UDMA_0) { 148 acpi->gtm.drive[unit].dma = t->udma; 149 acpi->gtm.flags |= (1 << (2 * unit)); 150 } else { 151 acpi->gtm.drive[unit].dma = t->cycle; 152 acpi->gtm.flags &= ~(1 << (2 * unit)); 153 } 154 ata_acpi_stm(ap, &acpi->gtm); 155 /* See what mode we actually got */ 156 ata_acpi_gtm(ap, &acpi->gtm); 157 } 158 159 /** 160 * pacpi_qc_issue - command issue 161 * @qc: command pending 162 * 163 * Called when the libata layer is about to issue a command. We wrap 164 * this interface so that we can load the correct ATA timings if 165 * necessary. 166 */ 167 168 static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc) 169 { 170 struct ata_port *ap = qc->ap; 171 struct ata_device *adev = qc->dev; 172 struct pata_acpi *acpi = ap->private_data; 173 174 if (acpi->gtm.flags & 0x10) 175 return ata_bmdma_qc_issue(qc); 176 177 if (adev != acpi->last) { 178 pacpi_set_piomode(ap, adev); 179 if (ata_dma_enabled(adev)) 180 pacpi_set_dmamode(ap, adev); 181 acpi->last = adev; 182 } 183 return ata_bmdma_qc_issue(qc); 184 } 185 186 /** 187 * pacpi_port_start - port setup 188 * @ap: ATA port being set up 189 * 190 * Use the port_start hook to maintain private control structures 191 */ 192 193 static int pacpi_port_start(struct ata_port *ap) 194 { 195 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 196 struct pata_acpi *acpi; 197 198 int ret; 199 200 if (ap->acpi_handle == NULL) 201 return -ENODEV; 202 203 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL); 204 if (ap->private_data == NULL) 205 return -ENOMEM; 206 acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]); 207 acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]); 208 ret = ata_bmdma_port_start(ap); 209 if (ret < 0) 210 return ret; 211 212 return ret; 213 } 214 215 static struct scsi_host_template pacpi_sht = { 216 ATA_BMDMA_SHT(DRV_NAME), 217 }; 218 219 static struct ata_port_operations pacpi_ops = { 220 .inherits = &ata_bmdma_port_ops, 221 .qc_issue = pacpi_qc_issue, 222 .cable_detect = pacpi_cable_detect, 223 .mode_filter = pacpi_mode_filter, 224 .set_piomode = pacpi_set_piomode, 225 .set_dmamode = pacpi_set_dmamode, 226 .prereset = pacpi_pre_reset, 227 .port_start = pacpi_port_start, 228 }; 229 230 231 /** 232 * pacpi_init_one - Register ACPI ATA PCI device with kernel services 233 * @pdev: PCI device to register 234 * @ent: Entry in pacpi_pci_tbl matching with @pdev 235 * 236 * Called from kernel PCI layer. 237 * 238 * LOCKING: 239 * Inherited from PCI layer (may sleep). 240 * 241 * RETURNS: 242 * Zero on success, or -ERRNO value. 243 */ 244 245 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id) 246 { 247 static const struct ata_port_info info = { 248 .flags = ATA_FLAG_SLAVE_POSS, 249 250 .pio_mask = ATA_PIO4, 251 .mwdma_mask = ATA_MWDMA2, 252 .udma_mask = ATA_UDMA6, 253 254 .port_ops = &pacpi_ops, 255 }; 256 const struct ata_port_info *ppi[] = { &info, NULL }; 257 if (pdev->vendor == PCI_VENDOR_ID_ATI) { 258 int rc = pcim_enable_device(pdev); 259 if (rc < 0) 260 return rc; 261 pcim_pin_device(pdev); 262 } 263 return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0); 264 } 265 266 static const struct pci_device_id pacpi_pci_tbl[] = { 267 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1}, 268 { } /* terminate list */ 269 }; 270 271 static struct pci_driver pacpi_pci_driver = { 272 .name = DRV_NAME, 273 .id_table = pacpi_pci_tbl, 274 .probe = pacpi_init_one, 275 .remove = ata_pci_remove_one, 276 #ifdef CONFIG_PM 277 .suspend = ata_pci_device_suspend, 278 .resume = ata_pci_device_resume, 279 #endif 280 }; 281 282 static int __init pacpi_init(void) 283 { 284 return pci_register_driver(&pacpi_pci_driver); 285 } 286 287 static void __exit pacpi_exit(void) 288 { 289 pci_unregister_driver(&pacpi_pci_driver); 290 } 291 292 module_init(pacpi_init); 293 module_exit(pacpi_exit); 294 295 MODULE_AUTHOR("Alan Cox"); 296 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode"); 297 MODULE_LICENSE("GPL"); 298 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl); 299 MODULE_VERSION(DRV_VERSION); 300 301