linux/drivers/ata/pata_cs5536.c
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   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/init.h>
  37#include <linux/blkdev.h>
  38#include <linux/delay.h>
  39#include <linux/libata.h>
  40#include <scsi/scsi_host.h>
  41#include <linux/dmi.h>
  42
  43#ifdef CONFIG_X86_32
  44#include <asm/msr.h>
  45static int use_msr;
  46module_param_named(msr, use_msr, int, 0644);
  47MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");
  48#else
  49#undef rdmsr    /* avoid accidental MSR usage on, e.g. x86-64 */
  50#undef wrmsr
  51#define rdmsr(x, y, z) do { } while (0)
  52#define wrmsr(x, y, z) do { } while (0)
  53#define use_msr 0
  54#endif
  55
  56#define DRV_NAME        "pata_cs5536"
  57#define DRV_VERSION     "0.0.8"
  58
  59enum {
  60        MSR_IDE_CFG             = 0x51300010,
  61        PCI_IDE_CFG             = 0x40,
  62
  63        CFG                     = 0,
  64        DTC                     = 2,
  65        CAST                    = 3,
  66        ETC                     = 4,
  67
  68        IDE_CFG_CHANEN          = (1 << 1),
  69        IDE_CFG_CABLE           = (1 << 17) | (1 << 16),
  70
  71        IDE_D0_SHIFT            = 24,
  72        IDE_D1_SHIFT            = 16,
  73        IDE_DRV_MASK            = 0xff,
  74
  75        IDE_CAST_D0_SHIFT       = 6,
  76        IDE_CAST_D1_SHIFT       = 4,
  77        IDE_CAST_DRV_MASK       = 0x3,
  78        IDE_CAST_CMD_MASK       = 0xff,
  79        IDE_CAST_CMD_SHIFT      = 24,
  80
  81        IDE_ETC_UDMA_MASK       = 0xc0,
  82};
  83
  84/* Some Bachmann OT200 devices have a non working UDMA support due a
  85 * missing resistor.
  86 */
  87static const struct dmi_system_id udma_quirk_dmi_table[] = {
  88        {
  89                .ident = "Bachmann electronic OT200",
  90                .matches = {
  91                        DMI_MATCH(DMI_SYS_VENDOR, "Bachmann electronic"),
  92                        DMI_MATCH(DMI_PRODUCT_NAME, "OT200"),
  93                        DMI_MATCH(DMI_PRODUCT_VERSION, "1")
  94                },
  95        },
  96        { }
  97};
  98
  99static int cs5536_read(struct pci_dev *pdev, int reg, u32 *val)
 100{
 101        if (unlikely(use_msr)) {
 102                u32 dummy __maybe_unused;
 103
 104                rdmsr(MSR_IDE_CFG + reg, *val, dummy);
 105                return 0;
 106        }
 107
 108        return pci_read_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
 109}
 110
 111static int cs5536_write(struct pci_dev *pdev, int reg, int val)
 112{
 113        if (unlikely(use_msr)) {
 114                wrmsr(MSR_IDE_CFG + reg, val, 0);
 115                return 0;
 116        }
 117
 118        return pci_write_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
 119}
 120
 121static void cs5536_program_dtc(struct ata_device *adev, u8 tim)
 122{
 123        struct pci_dev *pdev = to_pci_dev(adev->link->ap->host->dev);
 124        int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
 125        u32 dtc;
 126
 127        cs5536_read(pdev, DTC, &dtc);
 128        dtc &= ~(IDE_DRV_MASK << dshift);
 129        dtc |= tim << dshift;
 130        cs5536_write(pdev, DTC, dtc);
 131}
 132
 133/**
 134 *      cs5536_cable_detect     -       detect cable type
 135 *      @ap: Port to detect on
 136 *
 137 *      Perform cable detection for ATA66 capable cable.
 138 *
 139 *      Returns a cable type.
 140 */
 141
 142static int cs5536_cable_detect(struct ata_port *ap)
 143{
 144        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 145        u32 cfg;
 146
 147        cs5536_read(pdev, CFG, &cfg);
 148
 149        if (cfg & IDE_CFG_CABLE)
 150                return ATA_CBL_PATA80;
 151        else
 152                return ATA_CBL_PATA40;
 153}
 154
 155/**
 156 *      cs5536_set_piomode              -       PIO setup
 157 *      @ap: ATA interface
 158 *      @adev: device on the interface
 159 */
 160
 161static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
 162{
 163        static const u8 drv_timings[5] = {
 164                0x98, 0x55, 0x32, 0x21, 0x20,
 165        };
 166
 167        static const u8 addr_timings[5] = {
 168                0x2, 0x1, 0x0, 0x0, 0x0,
 169        };
 170
 171        static const u8 cmd_timings[5] = {
 172                0x99, 0x92, 0x90, 0x22, 0x20,
 173        };
 174
 175        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 176        struct ata_device *pair = ata_dev_pair(adev);
 177        int mode = adev->pio_mode - XFER_PIO_0;
 178        int cmdmode = mode;
 179        int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
 180        u32 cast;
 181
 182        if (pair)
 183                cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);
 184
 185        cs5536_program_dtc(adev, drv_timings[mode]);
 186
 187        cs5536_read(pdev, CAST, &cast);
 188
 189        cast &= ~(IDE_CAST_DRV_MASK << cshift);
 190        cast |= addr_timings[mode] << cshift;
 191
 192        cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
 193        cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT;
 194
 195        cs5536_write(pdev, CAST, cast);
 196}
 197
 198/**
 199 *      cs5536_set_dmamode              -       DMA timing setup
 200 *      @ap: ATA interface
 201 *      @adev: Device being configured
 202 *
 203 */
 204
 205static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 206{
 207        static const u8 udma_timings[6] = {
 208                0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6,
 209        };
 210
 211        static const u8 mwdma_timings[3] = {
 212                0x67, 0x21, 0x20,
 213        };
 214
 215        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 216        u32 etc;
 217        int mode = adev->dma_mode;
 218        int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
 219
 220        cs5536_read(pdev, ETC, &etc);
 221
 222        if (mode >= XFER_UDMA_0) {
 223                etc &= ~(IDE_DRV_MASK << dshift);
 224                etc |= udma_timings[mode - XFER_UDMA_0] << dshift;
 225        } else { /* MWDMA */
 226                etc &= ~(IDE_ETC_UDMA_MASK << dshift);
 227                cs5536_program_dtc(adev, mwdma_timings[mode - XFER_MW_DMA_0]);
 228        }
 229
 230        cs5536_write(pdev, ETC, etc);
 231}
 232
 233static struct scsi_host_template cs5536_sht = {
 234        ATA_BMDMA_SHT(DRV_NAME),
 235};
 236
 237static struct ata_port_operations cs5536_port_ops = {
 238        .inherits               = &ata_bmdma32_port_ops,
 239        .cable_detect           = cs5536_cable_detect,
 240        .set_piomode            = cs5536_set_piomode,
 241        .set_dmamode            = cs5536_set_dmamode,
 242};
 243
 244/**
 245 *      cs5536_init_one
 246 *      @dev: PCI device
 247 *      @id: Entry in match table
 248 *
 249 */
 250
 251static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 252{
 253        static const struct ata_port_info info = {
 254                .flags = ATA_FLAG_SLAVE_POSS,
 255                .pio_mask = ATA_PIO4,
 256                .mwdma_mask = ATA_MWDMA2,
 257                .udma_mask = ATA_UDMA5,
 258                .port_ops = &cs5536_port_ops,
 259        };
 260
 261        static const struct ata_port_info no_udma_info = {
 262                .flags = ATA_FLAG_SLAVE_POSS,
 263                .pio_mask = ATA_PIO4,
 264                .port_ops = &cs5536_port_ops,
 265        };
 266
 267
 268        const struct ata_port_info *ppi[2];
 269        u32 cfg;
 270
 271        if (dmi_check_system(udma_quirk_dmi_table))
 272                ppi[0] = &no_udma_info;
 273        else
 274                ppi[0] = &info;
 275
 276        ppi[1] = &ata_dummy_port_info;
 277
 278        if (use_msr)
 279                printk(KERN_ERR DRV_NAME ": Using MSR regs instead of PCI\n");
 280
 281        cs5536_read(dev, CFG, &cfg);
 282
 283        if ((cfg & IDE_CFG_CHANEN) == 0) {
 284                printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
 285                return -ENODEV;
 286        }
 287
 288        return ata_pci_bmdma_init_one(dev, ppi, &cs5536_sht, NULL, 0);
 289}
 290
 291static const struct pci_device_id cs5536[] = {
 292        { PCI_VDEVICE(AMD,      PCI_DEVICE_ID_AMD_CS5536_IDE), },
 293        { },
 294};
 295
 296static struct pci_driver cs5536_pci_driver = {
 297        .name           = DRV_NAME,
 298        .id_table       = cs5536,
 299        .probe          = cs5536_init_one,
 300        .remove         = ata_pci_remove_one,
 301#ifdef CONFIG_PM
 302        .suspend        = ata_pci_device_suspend,
 303        .resume         = ata_pci_device_resume,
 304#endif
 305};
 306
 307module_pci_driver(cs5536_pci_driver);
 308
 309MODULE_AUTHOR("Martin K. Petersen");
 310MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
 311MODULE_LICENSE("GPL");
 312MODULE_DEVICE_TABLE(pci, cs5536);
 313MODULE_VERSION(DRV_VERSION);
 314
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