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 static DEFINE_SPINLOCK(rdc_lock); 90 91 /** 92 * rdc_set_piomode - Initialize host controller PATA PIO timings 93 * @ap: Port whose timings we are configuring 94 * @adev: um 95 * 96 * Set PIO mode for device, in host controller PCI config space. 97 * 98 * LOCKING: 99 * None (inherited from caller). 100 */ 101 102 static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev) 103 { 104 unsigned int pio = adev->pio_mode - XFER_PIO_0; 105 struct pci_dev *dev = to_pci_dev(ap->host->dev); 106 unsigned long flags; 107 unsigned int is_slave = (adev->devno != 0); 108 unsigned int master_port= ap->port_no ? 0x42 : 0x40; 109 unsigned int slave_port = 0x44; 110 u16 master_data; 111 u8 slave_data; 112 u8 udma_enable; 113 int control = 0; 114 115 static const /* ISP RTC */ 116 u8 timings[][2] = { { 0, 0 }, 117 { 0, 0 }, 118 { 1, 0 }, 119 { 2, 1 }, 120 { 2, 3 }, }; 121 122 if (pio >= 2) 123 control |= 1; /* TIME1 enable */ 124 if (ata_pio_need_iordy(adev)) 125 control |= 2; /* IE enable */ 126 127 if (adev->class == ATA_DEV_ATA) 128 control |= 4; /* PPE enable */ 129 130 spin_lock_irqsave(&rdc_lock, flags); 131 132 /* PIO configuration clears DTE unconditionally. It will be 133 * programmed in set_dmamode which is guaranteed to be called 134 * after set_piomode if any DMA mode is available. 135 */ 136 pci_read_config_word(dev, master_port, &master_data); 137 if (is_slave) { 138 /* clear TIME1|IE1|PPE1|DTE1 */ 139 master_data &= 0xff0f; 140 /* Enable SITRE (separate slave timing register) */ 141 master_data |= 0x4000; 142 /* enable PPE1, IE1 and TIME1 as needed */ 143 master_data |= (control << 4); 144 pci_read_config_byte(dev, slave_port, &slave_data); 145 slave_data &= (ap->port_no ? 0x0f : 0xf0); 146 /* Load the timing nibble for this slave */ 147 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) 148 << (ap->port_no ? 4 : 0); 149 } else { 150 /* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */ 151 master_data &= 0xccf0; 152 /* Enable PPE, IE and TIME as appropriate */ 153 master_data |= control; 154 /* load ISP and RCT */ 155 master_data |= 156 (timings[pio][0] << 12) | 157 (timings[pio][1] << 8); 158 } 159 pci_write_config_word(dev, master_port, master_data); 160 if (is_slave) 161 pci_write_config_byte(dev, slave_port, slave_data); 162 163 /* Ensure the UDMA bit is off - it will be turned back on if 164 UDMA is selected */ 165 166 pci_read_config_byte(dev, 0x48, &udma_enable); 167 udma_enable &= ~(1 << (2 * ap->port_no + adev->devno)); 168 pci_write_config_byte(dev, 0x48, udma_enable); 169 170 spin_unlock_irqrestore(&rdc_lock, flags); 171 } 172 173 /** 174 * rdc_set_dmamode - Initialize host controller PATA PIO timings 175 * @ap: Port whose timings we are configuring 176 * @adev: Drive in question 177 * 178 * Set UDMA mode for device, in host controller PCI config space. 179 * 180 * LOCKING: 181 * None (inherited from caller). 182 */ 183 184 static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev) 185 { 186 struct pci_dev *dev = to_pci_dev(ap->host->dev); 187 unsigned long flags; 188 u8 master_port = ap->port_no ? 0x42 : 0x40; 189 u16 master_data; 190 u8 speed = adev->dma_mode; 191 int devid = adev->devno + 2 * ap->port_no; 192 u8 udma_enable = 0; 193 194 static const /* ISP RTC */ 195 u8 timings[][2] = { { 0, 0 }, 196 { 0, 0 }, 197 { 1, 0 }, 198 { 2, 1 }, 199 { 2, 3 }, }; 200 201 spin_lock_irqsave(&rdc_lock, flags); 202 203 pci_read_config_word(dev, master_port, &master_data); 204 pci_read_config_byte(dev, 0x48, &udma_enable); 205 206 if (speed >= XFER_UDMA_0) { 207 unsigned int udma = adev->dma_mode - XFER_UDMA_0; 208 u16 udma_timing; 209 u16 ideconf; 210 int u_clock, u_speed; 211 212 /* 213 * UDMA is handled by a combination of clock switching and 214 * selection of dividers 215 * 216 * Handy rule: Odd modes are UDMATIMx 01, even are 02 217 * except UDMA0 which is 00 218 */ 219 u_speed = min(2 - (udma & 1), udma); 220 if (udma == 5) 221 u_clock = 0x1000; /* 100Mhz */ 222 else if (udma > 2) 223 u_clock = 1; /* 66Mhz */ 224 else 225 u_clock = 0; /* 33Mhz */ 226 227 udma_enable |= (1 << devid); 228 229 /* Load the CT/RP selection */ 230 pci_read_config_word(dev, 0x4A, &udma_timing); 231 udma_timing &= ~(3 << (4 * devid)); 232 udma_timing |= u_speed << (4 * devid); 233 pci_write_config_word(dev, 0x4A, udma_timing); 234 235 /* Select a 33/66/100Mhz clock */ 236 pci_read_config_word(dev, 0x54, &ideconf); 237 ideconf &= ~(0x1001 << devid); 238 ideconf |= u_clock << devid; 239 pci_write_config_word(dev, 0x54, ideconf); 240 } else { 241 /* 242 * MWDMA is driven by the PIO timings. We must also enable 243 * IORDY unconditionally along with TIME1. PPE has already 244 * been set when the PIO timing was set. 245 */ 246 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0; 247 unsigned int control; 248 u8 slave_data; 249 const unsigned int needed_pio[3] = { 250 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 251 }; 252 int pio = needed_pio[mwdma] - XFER_PIO_0; 253 254 control = 3; /* IORDY|TIME1 */ 255 256 /* If the drive MWDMA is faster than it can do PIO then 257 we must force PIO into PIO0 */ 258 259 if (adev->pio_mode < needed_pio[mwdma]) 260 /* Enable DMA timing only */ 261 control |= 8; /* PIO cycles in PIO0 */ 262 263 if (adev->devno) { /* Slave */ 264 master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */ 265 master_data |= control << 4; 266 pci_read_config_byte(dev, 0x44, &slave_data); 267 slave_data &= (ap->port_no ? 0x0f : 0xf0); 268 /* Load the matching timing */ 269 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0); 270 pci_write_config_byte(dev, 0x44, slave_data); 271 } else { /* Master */ 272 master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY 273 and master timing bits */ 274 master_data |= control; 275 master_data |= 276 (timings[pio][0] << 12) | 277 (timings[pio][1] << 8); 278 } 279 280 udma_enable &= ~(1 << devid); 281 pci_write_config_word(dev, master_port, master_data); 282 } 283 pci_write_config_byte(dev, 0x48, udma_enable); 284 285 spin_unlock_irqrestore(&rdc_lock, flags); 286 } 287 288 static struct ata_port_operations rdc_pata_ops = { 289 .inherits = &ata_bmdma32_port_ops, 290 .cable_detect = rdc_pata_cable_detect, 291 .set_piomode = rdc_set_piomode, 292 .set_dmamode = rdc_set_dmamode, 293 .prereset = rdc_pata_prereset, 294 }; 295 296 static struct ata_port_info rdc_port_info = { 297 298 .flags = ATA_FLAG_SLAVE_POSS, 299 .pio_mask = ATA_PIO4, 300 .mwdma_mask = ATA_MWDMA12_ONLY, 301 .udma_mask = ATA_UDMA5, 302 .port_ops = &rdc_pata_ops, 303 }; 304 305 static struct scsi_host_template rdc_sht = { 306 ATA_BMDMA_SHT(DRV_NAME), 307 }; 308 309 /** 310 * rdc_init_one - Register PIIX ATA PCI device with kernel services 311 * @pdev: PCI device to register 312 * @ent: Entry in rdc_pci_tbl matching with @pdev 313 * 314 * Called from kernel PCI layer. We probe for combined mode (sigh), 315 * and then hand over control to libata, for it to do the rest. 316 * 317 * LOCKING: 318 * Inherited from PCI layer (may sleep). 319 * 320 * RETURNS: 321 * Zero on success, or -ERRNO value. 322 */ 323 324 static int __devinit rdc_init_one(struct pci_dev *pdev, 325 const struct pci_device_id *ent) 326 { 327 struct device *dev = &pdev->dev; 328 struct ata_port_info port_info[2]; 329 const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] }; 330 unsigned long port_flags; 331 struct ata_host *host; 332 struct rdc_host_priv *hpriv; 333 int rc; 334 335 ata_print_version_once(&pdev->dev, DRV_VERSION); 336 337 port_info[0] = rdc_port_info; 338 port_info[1] = rdc_port_info; 339 340 port_flags = port_info[0].flags; 341 342 /* enable device and prepare host */ 343 rc = pcim_enable_device(pdev); 344 if (rc) 345 return rc; 346 347 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL); 348 if (!hpriv) 349 return -ENOMEM; 350 351 /* Save IOCFG, this will be used for cable detection, quirk 352 * detection and restoration on detach. 353 */ 354 pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg); 355 356 rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host); 357 if (rc) 358 return rc; 359 host->private_data = hpriv; 360 361 pci_intx(pdev, 1); 362 363 host->flags |= ATA_HOST_PARALLEL_SCAN; 364 365 pci_set_master(pdev); 366 return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &rdc_sht); 367 } 368 369 static void rdc_remove_one(struct pci_dev *pdev) 370 { 371 struct ata_host *host = dev_get_drvdata(&pdev->dev); 372 struct rdc_host_priv *hpriv = host->private_data; 373 374 pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg); 375 376 ata_pci_remove_one(pdev); 377 } 378 379 static const struct pci_device_id rdc_pci_tbl[] = { 380 { PCI_DEVICE(0x17F3, 0x1011), }, 381 { PCI_DEVICE(0x17F3, 0x1012), }, 382 { } /* terminate list */ 383 }; 384 385 static struct pci_driver rdc_pci_driver = { 386 .name = DRV_NAME, 387 .id_table = rdc_pci_tbl, 388 .probe = rdc_init_one, 389 .remove = rdc_remove_one, 390 #ifdef CONFIG_PM 391 .suspend = ata_pci_device_suspend, 392 .resume = ata_pci_device_resume, 393 #endif 394 }; 395 396 397 module_pci_driver(rdc_pci_driver); 398 399 MODULE_AUTHOR("Alan Cox (based on ata_piix)"); 400 MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers"); 401 MODULE_LICENSE("GPL"); 402 MODULE_DEVICE_TABLE(pci, rdc_pci_tbl); 403 MODULE_VERSION(DRV_VERSION); 404