1 /* 2 * pata_rdc - Driver for later RDC PATA controllers 3 * 4 * This is actually a driver for hardware meeting 5 * INCITS 370-2004 (1510D): ATA Host Adapter Standards 6 * 7 * Based on ata_piix. 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2, or (at your option) 12 * any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; see the file COPYING. If not, write to 21 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/pci.h> 27 #include <linux/init.h> 28 #include <linux/blkdev.h> 29 #include <linux/delay.h> 30 #include <linux/device.h> 31 #include <linux/gfp.h> 32 #include <scsi/scsi_host.h> 33 #include <linux/libata.h> 34 #include <linux/dmi.h> 35 36 #define DRV_NAME "pata_rdc" 37 #define DRV_VERSION "0.01" 38 39 struct rdc_host_priv { 40 u32 saved_iocfg; 41 }; 42 43 /** 44 * rdc_pata_cable_detect - Probe host controller cable detect info 45 * @ap: Port for which cable detect info is desired 46 * 47 * Read 80c cable indicator from ATA PCI device's PCI config 48 * register. This register is normally set by firmware (BIOS). 49 * 50 * LOCKING: 51 * None (inherited from caller). 52 */ 53 54 static int rdc_pata_cable_detect(struct ata_port *ap) 55 { 56 struct rdc_host_priv *hpriv = ap->host->private_data; 57 u8 mask; 58 59 /* check BIOS cable detect results */ 60 mask = 0x30 << (2 * ap->port_no); 61 if ((hpriv->saved_iocfg & mask) == 0) 62 return ATA_CBL_PATA40; 63 return ATA_CBL_PATA80; 64 } 65 66 /** 67 * rdc_pata_prereset - prereset for PATA host controller 68 * @link: Target link 69 * @deadline: deadline jiffies for the operation 70 * 71 * LOCKING: 72 * None (inherited from caller). 73 */ 74 static int rdc_pata_prereset(struct ata_link *link, unsigned long deadline) 75 { 76 struct ata_port *ap = link->ap; 77 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 78 79 static const struct pci_bits rdc_enable_bits[] = { 80 { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */ 81 { 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */ 82 }; 83 84 if (!pci_test_config_bits(pdev, &rdc_enable_bits[ap->port_no])) 85 return -ENOENT; 86 return ata_sff_prereset(link, deadline); 87 } 88 89 /** 90 * rdc_set_piomode - Initialize host controller PATA PIO timings 91 * @ap: Port whose timings we are configuring 92 * @adev: um 93 * 94 * Set PIO mode for device, in host controller PCI config space. 95 * 96 * LOCKING: 97 * None (inherited from caller). 98 */ 99 100 static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev) 101 { 102 unsigned int pio = adev->pio_mode - XFER_PIO_0; 103 struct pci_dev *dev = to_pci_dev(ap->host->dev); 104 unsigned int is_slave = (adev->devno != 0); 105 unsigned int master_port= ap->port_no ? 0x42 : 0x40; 106 unsigned int slave_port = 0x44; 107 u16 master_data; 108 u8 slave_data; 109 u8 udma_enable; 110 int control = 0; 111 112 static const /* ISP RTC */ 113 u8 timings[][2] = { { 0, 0 }, 114 { 0, 0 }, 115 { 1, 0 }, 116 { 2, 1 }, 117 { 2, 3 }, }; 118 119 if (pio >= 2) 120 control |= 1; /* TIME1 enable */ 121 if (ata_pio_need_iordy(adev)) 122 control |= 2; /* IE enable */ 123 124 if (adev->class == ATA_DEV_ATA) 125 control |= 4; /* PPE enable */ 126 127 /* PIO configuration clears DTE unconditionally. It will be 128 * programmed in set_dmamode which is guaranteed to be called 129 * after set_piomode if any DMA mode is available. 130 */ 131 pci_read_config_word(dev, master_port, &master_data); 132 if (is_slave) { 133 /* clear TIME1|IE1|PPE1|DTE1 */ 134 master_data &= 0xff0f; 135 /* Enable SITRE (separate slave timing register) */ 136 master_data |= 0x4000; 137 /* enable PPE1, IE1 and TIME1 as needed */ 138 master_data |= (control << 4); 139 pci_read_config_byte(dev, slave_port, &slave_data); 140 slave_data &= (ap->port_no ? 0x0f : 0xf0); 141 /* Load the timing nibble for this slave */ 142 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) 143 << (ap->port_no ? 4 : 0); 144 } else { 145 /* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */ 146 master_data &= 0xccf0; 147 /* Enable PPE, IE and TIME as appropriate */ 148 master_data |= control; 149 /* load ISP and RCT */ 150 master_data |= 151 (timings[pio][0] << 12) | 152 (timings[pio][1] << 8); 153 } 154 pci_write_config_word(dev, master_port, master_data); 155 if (is_slave) 156 pci_write_config_byte(dev, slave_port, slave_data); 157 158 /* Ensure the UDMA bit is off - it will be turned back on if 159 UDMA is selected */ 160 161 pci_read_config_byte(dev, 0x48, &udma_enable); 162 udma_enable &= ~(1 << (2 * ap->port_no + adev->devno)); 163 pci_write_config_byte(dev, 0x48, udma_enable); 164 } 165 166 /** 167 * rdc_set_dmamode - Initialize host controller PATA PIO timings 168 * @ap: Port whose timings we are configuring 169 * @adev: Drive in question 170 * 171 * Set UDMA mode for device, in host controller PCI config space. 172 * 173 * LOCKING: 174 * None (inherited from caller). 175 */ 176 177 static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev) 178 { 179 struct pci_dev *dev = to_pci_dev(ap->host->dev); 180 u8 master_port = ap->port_no ? 0x42 : 0x40; 181 u16 master_data; 182 u8 speed = adev->dma_mode; 183 int devid = adev->devno + 2 * ap->port_no; 184 u8 udma_enable = 0; 185 186 static const /* ISP RTC */ 187 u8 timings[][2] = { { 0, 0 }, 188 { 0, 0 }, 189 { 1, 0 }, 190 { 2, 1 }, 191 { 2, 3 }, }; 192 193 pci_read_config_word(dev, master_port, &master_data); 194 pci_read_config_byte(dev, 0x48, &udma_enable); 195 196 if (speed >= XFER_UDMA_0) { 197 unsigned int udma = adev->dma_mode - XFER_UDMA_0; 198 u16 udma_timing; 199 u16 ideconf; 200 int u_clock, u_speed; 201 202 /* 203 * UDMA is handled by a combination of clock switching and 204 * selection of dividers 205 * 206 * Handy rule: Odd modes are UDMATIMx 01, even are 02 207 * except UDMA0 which is 00 208 */ 209 u_speed = min(2 - (udma & 1), udma); 210 if (udma == 5) 211 u_clock = 0x1000; /* 100Mhz */ 212 else if (udma > 2) 213 u_clock = 1; /* 66Mhz */ 214 else 215 u_clock = 0; /* 33Mhz */ 216 217 udma_enable |= (1 << devid); 218 219 /* Load the CT/RP selection */ 220 pci_read_config_word(dev, 0x4A, &udma_timing); 221 udma_timing &= ~(3 << (4 * devid)); 222 udma_timing |= u_speed << (4 * devid); 223 pci_write_config_word(dev, 0x4A, udma_timing); 224 225 /* Select a 33/66/100Mhz clock */ 226 pci_read_config_word(dev, 0x54, &ideconf); 227 ideconf &= ~(0x1001 << devid); 228 ideconf |= u_clock << devid; 229 pci_write_config_word(dev, 0x54, ideconf); 230 } else { 231 /* 232 * MWDMA is driven by the PIO timings. We must also enable 233 * IORDY unconditionally along with TIME1. PPE has already 234 * been set when the PIO timing was set. 235 */ 236 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0; 237 unsigned int control; 238 u8 slave_data; 239 const unsigned int needed_pio[3] = { 240 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 241 }; 242 int pio = needed_pio[mwdma] - XFER_PIO_0; 243 244 control = 3; /* IORDY|TIME1 */ 245 246 /* If the drive MWDMA is faster than it can do PIO then 247 we must force PIO into PIO0 */ 248 249 if (adev->pio_mode < needed_pio[mwdma]) 250 /* Enable DMA timing only */ 251 control |= 8; /* PIO cycles in PIO0 */ 252 253 if (adev->devno) { /* Slave */ 254 master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */ 255 master_data |= control << 4; 256 pci_read_config_byte(dev, 0x44, &slave_data); 257 slave_data &= (ap->port_no ? 0x0f : 0xf0); 258 /* Load the matching timing */ 259 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0); 260 pci_write_config_byte(dev, 0x44, slave_data); 261 } else { /* Master */ 262 master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY 263 and master timing bits */ 264 master_data |= control; 265 master_data |= 266 (timings[pio][0] << 12) | 267 (timings[pio][1] << 8); 268 } 269 270 udma_enable &= ~(1 << devid); 271 pci_write_config_word(dev, master_port, master_data); 272 } 273 pci_write_config_byte(dev, 0x48, udma_enable); 274 } 275 276 static struct ata_port_operations rdc_pata_ops = { 277 .inherits = &ata_bmdma32_port_ops, 278 .cable_detect = rdc_pata_cable_detect, 279 .set_piomode = rdc_set_piomode, 280 .set_dmamode = rdc_set_dmamode, 281 .prereset = rdc_pata_prereset, 282 }; 283 284 static struct ata_port_info rdc_port_info = { 285 286 .flags = ATA_FLAG_SLAVE_POSS, 287 .pio_mask = ATA_PIO4, 288 .mwdma_mask = ATA_MWDMA12_ONLY, 289 .udma_mask = ATA_UDMA5, 290 .port_ops = &rdc_pata_ops, 291 }; 292 293 static struct scsi_host_template rdc_sht = { 294 ATA_BMDMA_SHT(DRV_NAME), 295 }; 296 297 /** 298 * rdc_init_one - Register PIIX ATA PCI device with kernel services 299 * @pdev: PCI device to register 300 * @ent: Entry in rdc_pci_tbl matching with @pdev 301 * 302 * Called from kernel PCI layer. We probe for combined mode (sigh), 303 * and then hand over control to libata, for it to do the rest. 304 * 305 * LOCKING: 306 * Inherited from PCI layer (may sleep). 307 * 308 * RETURNS: 309 * Zero on success, or -ERRNO value. 310 */ 311 312 static int __devinit rdc_init_one(struct pci_dev *pdev, 313 const struct pci_device_id *ent) 314 { 315 struct device *dev = &pdev->dev; 316 struct ata_port_info port_info[2]; 317 const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] }; 318 unsigned long port_flags; 319 struct ata_host *host; 320 struct rdc_host_priv *hpriv; 321 int rc; 322 323 ata_print_version_once(&pdev->dev, DRV_VERSION); 324 325 port_info[0] = rdc_port_info; 326 port_info[1] = rdc_port_info; 327 328 port_flags = port_info[0].flags; 329 330 /* enable device and prepare host */ 331 rc = pcim_enable_device(pdev); 332 if (rc) 333 return rc; 334 335 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL); 336 if (!hpriv) 337 return -ENOMEM; 338 339 /* Save IOCFG, this will be used for cable detection, quirk 340 * detection and restoration on detach. 341 */ 342 pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg); 343 344 rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host); 345 if (rc) 346 return rc; 347 host->private_data = hpriv; 348 349 pci_intx(pdev, 1); 350 351 host->flags |= ATA_HOST_PARALLEL_SCAN; 352 353 pci_set_master(pdev); 354 return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &rdc_sht); 355 } 356 357 static void rdc_remove_one(struct pci_dev *pdev) 358 { 359 struct ata_host *host = dev_get_drvdata(&pdev->dev); 360 struct rdc_host_priv *hpriv = host->private_data; 361 362 pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg); 363 364 ata_pci_remove_one(pdev); 365 } 366 367 static const struct pci_device_id rdc_pci_tbl[] = { 368 { PCI_DEVICE(0x17F3, 0x1011), }, 369 { PCI_DEVICE(0x17F3, 0x1012), }, 370 { } /* terminate list */ 371 }; 372 373 static struct pci_driver rdc_pci_driver = { 374 .name = DRV_NAME, 375 .id_table = rdc_pci_tbl, 376 .probe = rdc_init_one, 377 .remove = rdc_remove_one, 378 }; 379 380 381 static int __init rdc_init(void) 382 { 383 return pci_register_driver(&rdc_pci_driver); 384 } 385 386 static void __exit rdc_exit(void) 387 { 388 pci_unregister_driver(&rdc_pci_driver); 389 } 390 391 module_init(rdc_init); 392 module_exit(rdc_exit); 393 394 MODULE_AUTHOR("Alan Cox (based on ata_piix)"); 395 MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers"); 396 MODULE_LICENSE("GPL"); 397 MODULE_DEVICE_TABLE(pci, rdc_pci_tbl); 398 MODULE_VERSION(DRV_VERSION); 399