1 /* 2 * pata_pdc202xx_old.c - Promise PDC202xx PATA for new ATA layer 3 * (C) 2005 Red Hat Inc 4 * Alan Cox <alan@lxorguk.ukuu.org.uk> 5 * (C) 2007 Bartlomiej Zolnierkiewicz 6 * 7 * Based in part on linux/drivers/ide/pci/pdc202xx_old.c 8 * 9 * First cut with LBA48/ATAPI 10 * 11 * TODO: 12 * Channel interlock/reset on both required ? 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/pci.h> 18 #include <linux/init.h> 19 #include <linux/blkdev.h> 20 #include <linux/delay.h> 21 #include <scsi/scsi_host.h> 22 #include <linux/libata.h> 23 24 #define DRV_NAME "pata_pdc202xx_old" 25 #define DRV_VERSION "0.4.3" 26 27 static int pdc2026x_cable_detect(struct ata_port *ap) 28 { 29 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 30 u16 cis; 31 32 pci_read_config_word(pdev, 0x50, &cis); 33 if (cis & (1 << (10 + ap->port_no))) 34 return ATA_CBL_PATA40; 35 return ATA_CBL_PATA80; 36 } 37 38 /** 39 * pdc202xx_configure_piomode - set chip PIO timing 40 * @ap: ATA interface 41 * @adev: ATA device 42 * @pio: PIO mode 43 * 44 * Called to do the PIO mode setup. Our timing registers are shared 45 * so a configure_dmamode call will undo any work we do here and vice 46 * versa 47 */ 48 49 static void pdc202xx_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio) 50 { 51 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 52 int port = 0x60 + 8 * ap->port_no + 4 * adev->devno; 53 static u16 pio_timing[5] = { 54 0x0913, 0x050C , 0x0308, 0x0206, 0x0104 55 }; 56 u8 r_ap, r_bp; 57 58 pci_read_config_byte(pdev, port, &r_ap); 59 pci_read_config_byte(pdev, port + 1, &r_bp); 60 r_ap &= ~0x3F; /* Preserve ERRDY_EN, SYNC_IN */ 61 r_bp &= ~0x1F; 62 r_ap |= (pio_timing[pio] >> 8); 63 r_bp |= (pio_timing[pio] & 0xFF); 64 65 if (ata_pio_need_iordy(adev)) 66 r_ap |= 0x20; /* IORDY enable */ 67 if (adev->class == ATA_DEV_ATA) 68 r_ap |= 0x10; /* FIFO enable */ 69 pci_write_config_byte(pdev, port, r_ap); 70 pci_write_config_byte(pdev, port + 1, r_bp); 71 } 72 73 /** 74 * pdc202xx_set_piomode - set initial PIO mode data 75 * @ap: ATA interface 76 * @adev: ATA device 77 * 78 * Called to do the PIO mode setup. Our timing registers are shared 79 * but we want to set the PIO timing by default. 80 */ 81 82 static void pdc202xx_set_piomode(struct ata_port *ap, struct ata_device *adev) 83 { 84 pdc202xx_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0); 85 } 86 87 /** 88 * pdc202xx_configure_dmamode - set DMA mode in chip 89 * @ap: ATA interface 90 * @adev: ATA device 91 * 92 * Load DMA cycle times into the chip ready for a DMA transfer 93 * to occur. 94 */ 95 96 static void pdc202xx_set_dmamode(struct ata_port *ap, struct ata_device *adev) 97 { 98 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 99 int port = 0x60 + 8 * ap->port_no + 4 * adev->devno; 100 static u8 udma_timing[6][2] = { 101 { 0x60, 0x03 }, /* 33 Mhz Clock */ 102 { 0x40, 0x02 }, 103 { 0x20, 0x01 }, 104 { 0x40, 0x02 }, /* 66 Mhz Clock */ 105 { 0x20, 0x01 }, 106 { 0x20, 0x01 } 107 }; 108 static u8 mdma_timing[3][2] = { 109 { 0xe0, 0x0f }, 110 { 0x60, 0x04 }, 111 { 0x60, 0x03 }, 112 }; 113 u8 r_bp, r_cp; 114 115 pci_read_config_byte(pdev, port + 1, &r_bp); 116 pci_read_config_byte(pdev, port + 2, &r_cp); 117 118 r_bp &= ~0xE0; 119 r_cp &= ~0x0F; 120 121 if (adev->dma_mode >= XFER_UDMA_0) { 122 int speed = adev->dma_mode - XFER_UDMA_0; 123 r_bp |= udma_timing[speed][0]; 124 r_cp |= udma_timing[speed][1]; 125 126 } else { 127 int speed = adev->dma_mode - XFER_MW_DMA_0; 128 r_bp |= mdma_timing[speed][0]; 129 r_cp |= mdma_timing[speed][1]; 130 } 131 pci_write_config_byte(pdev, port + 1, r_bp); 132 pci_write_config_byte(pdev, port + 2, r_cp); 133 134 } 135 136 /** 137 * pdc2026x_bmdma_start - DMA engine begin 138 * @qc: ATA command 139 * 140 * In UDMA3 or higher we have to clock switch for the duration of the 141 * DMA transfer sequence. 142 * 143 * Note: The host lock held by the libata layer protects 144 * us from two channels both trying to set DMA bits at once 145 */ 146 147 static void pdc2026x_bmdma_start(struct ata_queued_cmd *qc) 148 { 149 struct ata_port *ap = qc->ap; 150 struct ata_device *adev = qc->dev; 151 struct ata_taskfile *tf = &qc->tf; 152 int sel66 = ap->port_no ? 0x08: 0x02; 153 154 void __iomem *master = ap->host->ports[0]->ioaddr.bmdma_addr; 155 void __iomem *clock = master + 0x11; 156 void __iomem *atapi_reg = master + 0x20 + (4 * ap->port_no); 157 158 u32 len; 159 160 /* Check we keep host level locking here */ 161 if (adev->dma_mode >= XFER_UDMA_2) 162 iowrite8(ioread8(clock) | sel66, clock); 163 else 164 iowrite8(ioread8(clock) & ~sel66, clock); 165 166 /* The DMA clocks may have been trashed by a reset. FIXME: make conditional 167 and move to qc_issue ? */ 168 pdc202xx_set_dmamode(ap, qc->dev); 169 170 /* Cases the state machine will not complete correctly without help */ 171 if ((tf->flags & ATA_TFLAG_LBA48) || tf->protocol == ATAPI_PROT_DMA) { 172 len = qc->nbytes / 2; 173 174 if (tf->flags & ATA_TFLAG_WRITE) 175 len |= 0x06000000; 176 else 177 len |= 0x05000000; 178 179 iowrite32(len, atapi_reg); 180 } 181 182 /* Activate DMA */ 183 ata_bmdma_start(qc); 184 } 185 186 /** 187 * pdc2026x_bmdma_end - DMA engine stop 188 * @qc: ATA command 189 * 190 * After a DMA completes we need to put the clock back to 33MHz for 191 * PIO timings. 192 * 193 * Note: The host lock held by the libata layer protects 194 * us from two channels both trying to set DMA bits at once 195 */ 196 197 static void pdc2026x_bmdma_stop(struct ata_queued_cmd *qc) 198 { 199 struct ata_port *ap = qc->ap; 200 struct ata_device *adev = qc->dev; 201 struct ata_taskfile *tf = &qc->tf; 202 203 int sel66 = ap->port_no ? 0x08: 0x02; 204 /* The clock bits are in the same register for both channels */ 205 void __iomem *master = ap->host->ports[0]->ioaddr.bmdma_addr; 206 void __iomem *clock = master + 0x11; 207 void __iomem *atapi_reg = master + 0x20 + (4 * ap->port_no); 208 209 /* Cases the state machine will not complete correctly */ 210 if (tf->protocol == ATAPI_PROT_DMA || (tf->flags & ATA_TFLAG_LBA48)) { 211 iowrite32(0, atapi_reg); 212 iowrite8(ioread8(clock) & ~sel66, clock); 213 } 214 /* Flip back to 33Mhz for PIO */ 215 if (adev->dma_mode >= XFER_UDMA_2) 216 iowrite8(ioread8(clock) & ~sel66, clock); 217 ata_bmdma_stop(qc); 218 pdc202xx_set_piomode(ap, adev); 219 } 220 221 /** 222 * pdc2026x_dev_config - device setup hook 223 * @adev: newly found device 224 * 225 * Perform chip specific early setup. We need to lock the transfer 226 * sizes to 8bit to avoid making the state engine on the 2026x cards 227 * barf. 228 */ 229 230 static void pdc2026x_dev_config(struct ata_device *adev) 231 { 232 adev->max_sectors = 256; 233 } 234 235 static int pdc2026x_port_start(struct ata_port *ap) 236 { 237 void __iomem *bmdma = ap->ioaddr.bmdma_addr; 238 if (bmdma) { 239 /* Enable burst mode */ 240 u8 burst = ioread8(bmdma + 0x1f); 241 iowrite8(burst | 0x01, bmdma + 0x1f); 242 } 243 return ata_sff_port_start(ap); 244 } 245 246 /** 247 * pdc2026x_check_atapi_dma - Check whether ATAPI DMA can be supported for this command 248 * @qc: Metadata associated with taskfile to check 249 * 250 * Just say no - not supported on older Promise. 251 * 252 * LOCKING: 253 * None (inherited from caller). 254 * 255 * RETURNS: 0 when ATAPI DMA can be used 256 * 1 otherwise 257 */ 258 259 static int pdc2026x_check_atapi_dma(struct ata_queued_cmd *qc) 260 { 261 return 1; 262 } 263 264 static struct scsi_host_template pdc202xx_sht = { 265 ATA_BMDMA_SHT(DRV_NAME), 266 }; 267 268 static struct ata_port_operations pdc2024x_port_ops = { 269 .inherits = &ata_bmdma_port_ops, 270 271 .cable_detect = ata_cable_40wire, 272 .set_piomode = pdc202xx_set_piomode, 273 .set_dmamode = pdc202xx_set_dmamode, 274 }; 275 276 static struct ata_port_operations pdc2026x_port_ops = { 277 .inherits = &pdc2024x_port_ops, 278 279 .check_atapi_dma = pdc2026x_check_atapi_dma, 280 .bmdma_start = pdc2026x_bmdma_start, 281 .bmdma_stop = pdc2026x_bmdma_stop, 282 283 .cable_detect = pdc2026x_cable_detect, 284 .dev_config = pdc2026x_dev_config, 285 286 .port_start = pdc2026x_port_start, 287 }; 288 289 static int pdc202xx_init_one(struct pci_dev *dev, const struct pci_device_id *id) 290 { 291 static const struct ata_port_info info[3] = { 292 { 293 .flags = ATA_FLAG_SLAVE_POSS, 294 .pio_mask = ATA_PIO4, 295 .mwdma_mask = ATA_MWDMA2, 296 .udma_mask = ATA_UDMA2, 297 .port_ops = &pdc2024x_port_ops 298 }, 299 { 300 .flags = ATA_FLAG_SLAVE_POSS, 301 .pio_mask = ATA_PIO4, 302 .mwdma_mask = ATA_MWDMA2, 303 .udma_mask = ATA_UDMA4, 304 .port_ops = &pdc2026x_port_ops 305 }, 306 { 307 .flags = ATA_FLAG_SLAVE_POSS, 308 .pio_mask = ATA_PIO4, 309 .mwdma_mask = ATA_MWDMA2, 310 .udma_mask = ATA_UDMA5, 311 .port_ops = &pdc2026x_port_ops 312 } 313 314 }; 315 const struct ata_port_info *ppi[] = { &info[id->driver_data], NULL }; 316 317 if (dev->device == PCI_DEVICE_ID_PROMISE_20265) { 318 struct pci_dev *bridge = dev->bus->self; 319 /* Don't grab anything behind a Promise I2O RAID */ 320 if (bridge && bridge->vendor == PCI_VENDOR_ID_INTEL) { 321 if (bridge->device == PCI_DEVICE_ID_INTEL_I960) 322 return -ENODEV; 323 if (bridge->device == PCI_DEVICE_ID_INTEL_I960RM) 324 return -ENODEV; 325 } 326 } 327 return ata_pci_sff_init_one(dev, ppi, &pdc202xx_sht, NULL); 328 } 329 330 static const struct pci_device_id pdc202xx[] = { 331 { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20246), 0 }, 332 { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20262), 1 }, 333 { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20263), 1 }, 334 { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20265), 2 }, 335 { PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20267), 2 }, 336 337 { }, 338 }; 339 340 static struct pci_driver pdc202xx_pci_driver = { 341 .name = DRV_NAME, 342 .id_table = pdc202xx, 343 .probe = pdc202xx_init_one, 344 .remove = ata_pci_remove_one, 345 #ifdef CONFIG_PM 346 .suspend = ata_pci_device_suspend, 347 .resume = ata_pci_device_resume, 348 #endif 349 }; 350 351 static int __init pdc202xx_init(void) 352 { 353 return pci_register_driver(&pdc202xx_pci_driver); 354 } 355 356 static void __exit pdc202xx_exit(void) 357 { 358 pci_unregister_driver(&pdc202xx_pci_driver); 359 } 360 361 MODULE_AUTHOR("Alan Cox"); 362 MODULE_DESCRIPTION("low-level driver for Promise 2024x and 20262-20267"); 363 MODULE_LICENSE("GPL"); 364 MODULE_DEVICE_TABLE(pci, pdc202xx); 365 MODULE_VERSION(DRV_VERSION); 366 367 module_init(pdc202xx_init); 368 module_exit(pdc202xx_exit); 369