1 /* 2 * pata_cs5536.c - CS5536 PATA for new ATA layer 3 * (C) 2007 Martin K. Petersen <mkp@mkp.net> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 * 18 * Documentation: 19 * Available from AMD web site. 20 * 21 * The IDE timing registers for the CS5536 live in the Geode Machine 22 * Specific Register file and not PCI config space. Most BIOSes 23 * virtualize the PCI registers so the chip looks like a standard IDE 24 * controller. Unfortunately not all implementations get this right. 25 * In particular some have problems with unaligned accesses to the 26 * virtualized PCI registers. This driver always does full dword 27 * writes to work around the issue. Also, in case of a bad BIOS this 28 * driver can be loaded with the "msr=1" parameter which forces using 29 * the Machine Specific Registers to configure the device. 30 */ 31 32 #include <linux/kernel.h> 33 #include <linux/module.h> 34 #include <linux/pci.h> 35 #include <linux/init.h> 36 #include <linux/blkdev.h> 37 #include <linux/delay.h> 38 #include <linux/libata.h> 39 #include <scsi/scsi_host.h> 40 41 #ifdef CONFIG_X86_32 42 #include <asm/msr.h> 43 static int use_msr; 44 module_param_named(msr, use_msr, int, 0644); 45 MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)"); 46 #else 47 #undef rdmsr /* avoid accidental MSR usage on, e.g. x86-64 */ 48 #undef wrmsr 49 #define rdmsr(x, y, z) do { } while (0) 50 #define wrmsr(x, y, z) do { } while (0) 51 #define use_msr 0 52 #endif 53 54 #define DRV_NAME "pata_cs5536" 55 #define DRV_VERSION "0.0.8" 56 57 enum { 58 CFG = 0, 59 DTC = 1, 60 CAST = 2, 61 ETC = 3, 62 63 MSR_IDE_BASE = 0x51300000, 64 MSR_IDE_CFG = (MSR_IDE_BASE + 0x10), 65 MSR_IDE_DTC = (MSR_IDE_BASE + 0x12), 66 MSR_IDE_CAST = (MSR_IDE_BASE + 0x13), 67 MSR_IDE_ETC = (MSR_IDE_BASE + 0x14), 68 69 PCI_IDE_CFG = 0x40, 70 PCI_IDE_DTC = 0x48, 71 PCI_IDE_CAST = 0x4c, 72 PCI_IDE_ETC = 0x50, 73 74 IDE_CFG_CHANEN = 0x2, 75 IDE_CFG_CABLE = 0x10000, 76 77 IDE_D0_SHIFT = 24, 78 IDE_D1_SHIFT = 16, 79 IDE_DRV_MASK = 0xff, 80 81 IDE_CAST_D0_SHIFT = 6, 82 IDE_CAST_D1_SHIFT = 4, 83 IDE_CAST_DRV_MASK = 0x3, 84 IDE_CAST_CMD_MASK = 0xff, 85 IDE_CAST_CMD_SHIFT = 24, 86 87 IDE_ETC_NODMA = 0x03, 88 }; 89 90 static const u32 msr_reg[4] = { 91 MSR_IDE_CFG, MSR_IDE_DTC, MSR_IDE_CAST, MSR_IDE_ETC, 92 }; 93 94 static const u8 pci_reg[4] = { 95 PCI_IDE_CFG, PCI_IDE_DTC, PCI_IDE_CAST, PCI_IDE_ETC, 96 }; 97 98 static inline int cs5536_read(struct pci_dev *pdev, int reg, u32 *val) 99 { 100 if (unlikely(use_msr)) { 101 u32 dummy __maybe_unused; 102 103 rdmsr(msr_reg[reg], *val, dummy); 104 return 0; 105 } 106 107 return pci_read_config_dword(pdev, pci_reg[reg], val); 108 } 109 110 static inline int cs5536_write(struct pci_dev *pdev, int reg, int val) 111 { 112 if (unlikely(use_msr)) { 113 wrmsr(msr_reg[reg], val, 0); 114 return 0; 115 } 116 117 return pci_write_config_dword(pdev, pci_reg[reg], val); 118 } 119 120 /** 121 * cs5536_cable_detect - detect cable type 122 * @ap: Port to detect on 123 * 124 * Perform cable detection for ATA66 capable cable. Return a libata 125 * cable type. 126 */ 127 128 static int cs5536_cable_detect(struct ata_port *ap) 129 { 130 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 131 u32 cfg; 132 133 cs5536_read(pdev, CFG, &cfg); 134 135 if (cfg & (IDE_CFG_CABLE << ap->port_no)) 136 return ATA_CBL_PATA80; 137 else 138 return ATA_CBL_PATA40; 139 } 140 141 /** 142 * cs5536_set_piomode - PIO setup 143 * @ap: ATA interface 144 * @adev: device on the interface 145 */ 146 147 static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev) 148 { 149 static const u8 drv_timings[5] = { 150 0x98, 0x55, 0x32, 0x21, 0x20, 151 }; 152 153 static const u8 addr_timings[5] = { 154 0x2, 0x1, 0x0, 0x0, 0x0, 155 }; 156 157 static const u8 cmd_timings[5] = { 158 0x99, 0x92, 0x90, 0x22, 0x20, 159 }; 160 161 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 162 struct ata_device *pair = ata_dev_pair(adev); 163 int mode = adev->pio_mode - XFER_PIO_0; 164 int cmdmode = mode; 165 int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT; 166 int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT; 167 u32 dtc, cast, etc; 168 169 if (pair) 170 cmdmode = min(mode, pair->pio_mode - XFER_PIO_0); 171 172 cs5536_read(pdev, DTC, &dtc); 173 cs5536_read(pdev, CAST, &cast); 174 cs5536_read(pdev, ETC, &etc); 175 176 dtc &= ~(IDE_DRV_MASK << dshift); 177 dtc |= drv_timings[mode] << dshift; 178 179 cast &= ~(IDE_CAST_DRV_MASK << cshift); 180 cast |= addr_timings[mode] << cshift; 181 182 cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT); 183 cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT; 184 185 etc &= ~(IDE_DRV_MASK << dshift); 186 etc |= IDE_ETC_NODMA << dshift; 187 188 cs5536_write(pdev, DTC, dtc); 189 cs5536_write(pdev, CAST, cast); 190 cs5536_write(pdev, ETC, etc); 191 } 192 193 /** 194 * cs5536_set_dmamode - DMA timing setup 195 * @ap: ATA interface 196 * @adev: Device being configured 197 * 198 */ 199 200 static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev) 201 { 202 static const u8 udma_timings[6] = { 203 0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6, 204 }; 205 206 static const u8 mwdma_timings[3] = { 207 0x67, 0x21, 0x20, 208 }; 209 210 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 211 u32 dtc, etc; 212 int mode = adev->dma_mode; 213 int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT; 214 215 if (mode >= XFER_UDMA_0) { 216 cs5536_read(pdev, ETC, &etc); 217 218 etc &= ~(IDE_DRV_MASK << dshift); 219 etc |= udma_timings[mode - XFER_UDMA_0] << dshift; 220 221 cs5536_write(pdev, ETC, etc); 222 } else { /* MWDMA */ 223 cs5536_read(pdev, DTC, &dtc); 224 225 dtc &= ~(IDE_DRV_MASK << dshift); 226 dtc |= mwdma_timings[mode - XFER_MW_DMA_0] << dshift; 227 228 cs5536_write(pdev, DTC, dtc); 229 } 230 } 231 232 static struct scsi_host_template cs5536_sht = { 233 ATA_BMDMA_SHT(DRV_NAME), 234 }; 235 236 static struct ata_port_operations cs5536_port_ops = { 237 .inherits = &ata_bmdma32_port_ops, 238 .cable_detect = cs5536_cable_detect, 239 .set_piomode = cs5536_set_piomode, 240 .set_dmamode = cs5536_set_dmamode, 241 }; 242 243 /** 244 * cs5536_init_one 245 * @dev: PCI device 246 * @id: Entry in match table 247 * 248 */ 249 250 static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id) 251 { 252 static const struct ata_port_info info = { 253 .flags = ATA_FLAG_SLAVE_POSS, 254 .pio_mask = ATA_PIO4, 255 .mwdma_mask = ATA_MWDMA2, 256 .udma_mask = ATA_UDMA5, 257 .port_ops = &cs5536_port_ops, 258 }; 259 260 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info }; 261 u32 cfg; 262 263 if (use_msr) 264 printk(KERN_ERR DRV_NAME ": Using MSR regs instead of PCI\n"); 265 266 cs5536_read(dev, CFG, &cfg); 267 268 if ((cfg & IDE_CFG_CHANEN) == 0) { 269 printk(KERN_ERR DRV_NAME ": disabled by BIOS\n"); 270 return -ENODEV; 271 } 272 273 return ata_pci_bmdma_init_one(dev, ppi, &cs5536_sht, NULL, 0); 274 } 275 276 static const struct pci_device_id cs5536[] = { 277 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), }, 278 { }, 279 }; 280 281 static struct pci_driver cs5536_pci_driver = { 282 .name = DRV_NAME, 283 .id_table = cs5536, 284 .probe = cs5536_init_one, 285 .remove = ata_pci_remove_one, 286 #ifdef CONFIG_PM 287 .suspend = ata_pci_device_suspend, 288 .resume = ata_pci_device_resume, 289 #endif 290 }; 291 292 static int __init cs5536_init(void) 293 { 294 return pci_register_driver(&cs5536_pci_driver); 295 } 296 297 static void __exit cs5536_exit(void) 298 { 299 pci_unregister_driver(&cs5536_pci_driver); 300 } 301 302 MODULE_AUTHOR("Martin K. Petersen"); 303 MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller"); 304 MODULE_LICENSE("GPL"); 305 MODULE_DEVICE_TABLE(pci, cs5536); 306 MODULE_VERSION(DRV_VERSION); 307 308 module_init(cs5536_init); 309 module_exit(cs5536_exit); 310