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  *                        (C) 2011 Bartlomiej Zolnierkiewicz
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  * Documentation:
  20  *      Available from AMD web site.
  21  *
  22  * The IDE timing registers for the CS5536 live in the Geode Machine
  23  * Specific Register file and not PCI config space.  Most BIOSes
  24  * virtualize the PCI registers so the chip looks like a standard IDE
  25  * controller.  Unfortunately not all implementations get this right.
  26  * In particular some have problems with unaligned accesses to the
  27  * virtualized PCI registers.  This driver always does full dword
  28  * writes to work around the issue.  Also, in case of a bad BIOS this
  29  * driver can be loaded with the "msr=1" parameter which forces using
  30  * the Machine Specific Registers to configure the device.
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/pci.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/delay.h>
  38 #include <linux/libata.h>
  39 #include <scsi/scsi_host.h>
  40 #include <linux/dmi.h>
  41
  42 #ifdef CONFIG_X86_32
  43 #include <asm/msr.h>
  44 static int use_msr;
  45 module_param_named(msr, use_msr, int, 0644);
  46 MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");
  47 #else
  48 #undef rdmsr    /* avoid accidental MSR usage on, e.g. x86-64 */
  49 #undef wrmsr
  50 #define rdmsr(x, y, z) do { } while (0)
  51 #define wrmsr(x, y, z) do { } while (0)
  52 #define use_msr 0
  53 #endif
  54
  55 #define DRV_NAME        "pata_cs5536"
  56 #define DRV_VERSION     "0.0.8"
  57
  58 enum {
  59         MSR_IDE_CFG             = 0x51300010,
  60         PCI_IDE_CFG             = 0x40,
  61
  62         CFG                     = 0,
  63         DTC                     = 2,
  64         CAST                    = 3,
  65         ETC                     = 4,
  66
  67         IDE_CFG_CHANEN          = (1 << 1),
  68         IDE_CFG_CABLE           = (1 << 17) | (1 << 16),
  69
  70         IDE_D0_SHIFT            = 24,
  71         IDE_D1_SHIFT            = 16,
  72         IDE_DRV_MASK            = 0xff,
  73
  74         IDE_CAST_D0_SHIFT       = 6,
  75         IDE_CAST_D1_SHIFT       = 4,
  76         IDE_CAST_DRV_MASK       = 0x3,
  77         IDE_CAST_CMD_MASK       = 0xff,
  78         IDE_CAST_CMD_SHIFT      = 24,
  79
  80         IDE_ETC_UDMA_MASK       = 0xc0,
  81 };
  82
  83 /* Some Bachmann OT200 devices have a non working UDMA support due a
  84  * missing resistor.
  85  */
  86 static const struct dmi_system_id udma_quirk_dmi_table[] = {
  87         {
  88                 .ident = "Bachmann electronic OT200",
  89                 .matches = {
  90                         DMI_MATCH(DMI_SYS_VENDOR, "Bachmann electronic"),
  91                         DMI_MATCH(DMI_PRODUCT_NAME, "OT200"),
  92                         DMI_MATCH(DMI_PRODUCT_VERSION, "1")
  93                 },
  94         },
  95         { }
  96 };
  97
  98 static 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_IDE_CFG + reg, *val, dummy);
 104                 return 0;
 105         }
 106
 107         return pci_read_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
 108 }
 109
 110 static int cs5536_write(struct pci_dev *pdev, int reg, int val)
 111 {
 112         if (unlikely(use_msr)) {
 113                 wrmsr(MSR_IDE_CFG + reg, val, 0);
 114                 return 0;
 115         }
 116
 117         return pci_write_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
 118 }
 119
 120 static void cs5536_program_dtc(struct ata_device *adev, u8 tim)
 121 {
 122         struct pci_dev *pdev = to_pci_dev(adev->link->ap->host->dev);
 123         int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
 124         u32 dtc;
 125
 126         cs5536_read(pdev, DTC, &dtc);
 127         dtc &= ~(IDE_DRV_MASK << dshift);
 128         dtc |= tim << dshift;
 129         cs5536_write(pdev, DTC, dtc);
 130 }
 131
 132 /**
 133  *      cs5536_cable_detect     -       detect cable type
 134  *      @ap: Port to detect on
 135  *
 136  *      Perform cable detection for ATA66 capable cable.
 137  *
 138  *      Returns a cable type.
 139  */
 140
 141 static int cs5536_cable_detect(struct ata_port *ap)
 142 {
 143         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 144         u32 cfg;
 145
 146         cs5536_read(pdev, CFG, &cfg);
 147
 148         if (cfg & IDE_CFG_CABLE)
 149                 return ATA_CBL_PATA80;
 150         else
 151                 return ATA_CBL_PATA40;
 152 }
 153
 154 /**
 155  *      cs5536_set_piomode              -       PIO setup
 156  *      @ap: ATA interface
 157  *      @adev: device on the interface
 158  */
 159
 160 static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
 161 {
 162         static const u8 drv_timings[5] = {
 163                 0x98, 0x55, 0x32, 0x21, 0x20,
 164         };
 165
 166         static const u8 addr_timings[5] = {
 167                 0x2, 0x1, 0x0, 0x0, 0x0,
 168         };
 169
 170         static const u8 cmd_timings[5] = {
 171                 0x99, 0x92, 0x90, 0x22, 0x20,
 172         };
 173
 174         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 175         struct ata_device *pair = ata_dev_pair(adev);
 176         int mode = adev->pio_mode - XFER_PIO_0;
 177         int cmdmode = mode;
 178         int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
 179         u32 cast;
 180
 181         if (pair)
 182                 cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);
 183
 184         cs5536_program_dtc(adev, drv_timings[mode]);
 185
 186         cs5536_read(pdev, CAST, &cast);
 187
 188         cast &= ~(IDE_CAST_DRV_MASK << cshift);
 189         cast |= addr_timings[mode] << cshift;
 190
 191         cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
 192         cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT;
 193
 194         cs5536_write(pdev, CAST, cast);
 195 }
 196
 197 /**
 198  *      cs5536_set_dmamode              -       DMA timing setup
 199  *      @ap: ATA interface
 200  *      @adev: Device being configured
 201  *
 202  */
 203
 204 static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 205 {
 206         static const u8 udma_timings[6] = {
 207                 0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6,
 208         };
 209
 210         static const u8 mwdma_timings[3] = {
 211                 0x67, 0x21, 0x20,
 212         };
 213
 214         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 215         u32 etc;
 216         int mode = adev->dma_mode;
 217         int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
 218
 219         cs5536_read(pdev, ETC, &etc);
 220
 221         if (mode >= XFER_UDMA_0) {
 222                 etc &= ~(IDE_DRV_MASK << dshift);
 223                 etc |= udma_timings[mode - XFER_UDMA_0] << dshift;
 224         } else { /* MWDMA */
 225                 etc &= ~(IDE_ETC_UDMA_MASK << dshift);
 226                 cs5536_program_dtc(adev, mwdma_timings[mode - XFER_MW_DMA_0]);
 227         }
 228
 229         cs5536_write(pdev, ETC, etc);
 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         static const struct ata_port_info no_udma_info = {
 261                 .flags = ATA_FLAG_SLAVE_POSS,
 262                 .pio_mask = ATA_PIO4,
 263                 .port_ops = &cs5536_port_ops,
 264         };
 265
 266
 267         const struct ata_port_info *ppi[2];
 268         u32 cfg;
 269
 270         if (dmi_check_system(udma_quirk_dmi_table))
 271                 ppi[0] = &no_udma_info;
 272         else
 273                 ppi[0] = &info;
 274
 275         ppi[1] = &ata_dummy_port_info;
 276
 277         if (use_msr)
 278                 printk(KERN_ERR DRV_NAME ": Using MSR regs instead of PCI\n");
 279
 280         cs5536_read(dev, CFG, &cfg);
 281
 282         if ((cfg & IDE_CFG_CHANEN) == 0) {
 283                 printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
 284                 return -ENODEV;
 285         }
 286
 287         return ata_pci_bmdma_init_one(dev, ppi, &cs5536_sht, NULL, 0);
 288 }
 289
 290 static const struct pci_device_id cs5536[] = {
 291         { PCI_VDEVICE(AMD,      PCI_DEVICE_ID_AMD_CS5536_IDE), },
 292         { },
 293 };
 294
 295 static struct pci_driver cs5536_pci_driver = {
 296         .name           = DRV_NAME,
 297         .id_table       = cs5536,
 298         .probe          = cs5536_init_one,
 299         .remove         = ata_pci_remove_one,
 300 #ifdef CONFIG_PM
 301         .suspend        = ata_pci_device_suspend,
 302         .resume         = ata_pci_device_resume,
 303 #endif
 304 };
 305
 306 module_pci_driver(cs5536_pci_driver);
 307
 308 MODULE_AUTHOR("Martin K. Petersen");
 309 MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
 310 MODULE_LICENSE("GPL");
 311 MODULE_DEVICE_TABLE(pci, cs5536);
 312 MODULE_VERSION(DRV_VERSION);