drivers/ata/pata_cs5536.c

   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);