linux/drivers/ata/ata_generic.c
<<
>>
Prefs
   1/*
   2 *  ata_generic.c - Generic PATA/SATA controller driver.
   3 *  Copyright 2005 Red Hat Inc, all rights reserved.
   4 *
   5 *  Elements from ide/pci/generic.c
   6 *          Copyright (C) 2001-2002     Andre Hedrick <andre@linux-ide.org>
   7 *          Portions (C) Copyright 2002  Red Hat Inc <alan@redhat.com>
   8 *
   9 *  May be copied or modified under the terms of the GNU General Public License
  10 *
  11 *  Driver for PCI IDE interfaces implementing the standard bus mastering
  12 *  interface functionality. This assumes the BIOS did the drive set up and
  13 *  tuning for us. By default we do not grab all IDE class devices as they
  14 *  may have other drivers or need fixups to avoid problems. Instead we keep
  15 *  a default list of stuff without documentation/driver that appears to
  16 *  work.
  17 */
  18
  19#include <linux/kernel.h>
  20#include <linux/module.h>
  21#include <linux/pci.h>
  22#include <linux/blkdev.h>
  23#include <linux/delay.h>
  24#include <scsi/scsi_host.h>
  25#include <linux/libata.h>
  26
  27#define DRV_NAME "ata_generic"
  28#define DRV_VERSION "0.2.15"
  29
  30/*
  31 *      A generic parallel ATA driver using libata
  32 */
  33
  34enum {
  35        ATA_GEN_CLASS_MATCH             = (1 << 0),
  36        ATA_GEN_FORCE_DMA               = (1 << 1),
  37        ATA_GEN_INTEL_IDER              = (1 << 2),
  38};
  39
  40/**
  41 *      generic_set_mode        -       mode setting
  42 *      @link: link to set up
  43 *      @unused: returned device on error
  44 *
  45 *      Use a non standard set_mode function. We don't want to be tuned.
  46 *      The BIOS configured everything. Our job is not to fiddle. We
  47 *      read the dma enabled bits from the PCI configuration of the device
  48 *      and respect them.
  49 */
  50
  51static int generic_set_mode(struct ata_link *link, struct ata_device **unused)
  52{
  53        struct ata_port *ap = link->ap;
  54        const struct pci_device_id *id = ap->host->private_data;
  55        int dma_enabled = 0;
  56        struct ata_device *dev;
  57
  58        if (id->driver_data & ATA_GEN_FORCE_DMA) {
  59                dma_enabled = 0xff;
  60        } else if (ap->ioaddr.bmdma_addr) {
  61                /* Bits 5 and 6 indicate if DMA is active on master/slave */
  62                dma_enabled = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
  63        }
  64
  65        ata_for_each_dev(dev, link, ENABLED) {
  66                /* We don't really care */
  67                dev->pio_mode = XFER_PIO_0;
  68                dev->dma_mode = XFER_MW_DMA_0;
  69                /* We do need the right mode information for DMA or PIO
  70                   and this comes from the current configuration flags */
  71                if (dma_enabled & (1 << (5 + dev->devno))) {
  72                        unsigned int xfer_mask = ata_id_xfermask(dev->id);
  73                        const char *name;
  74
  75                        if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
  76                                name = ata_mode_string(xfer_mask);
  77                        else {
  78                                /* SWDMA perhaps? */
  79                                name = "DMA";
  80                                xfer_mask |= ata_xfer_mode2mask(XFER_MW_DMA_0);
  81                        }
  82
  83                        ata_dev_info(dev, "configured for %s\n", name);
  84
  85                        dev->xfer_mode = ata_xfer_mask2mode(xfer_mask);
  86                        dev->xfer_shift = ata_xfer_mode2shift(dev->xfer_mode);
  87                        dev->flags &= ~ATA_DFLAG_PIO;
  88                } else {
  89                        ata_dev_info(dev, "configured for PIO\n");
  90                        dev->xfer_mode = XFER_PIO_0;
  91                        dev->xfer_shift = ATA_SHIFT_PIO;
  92                        dev->flags |= ATA_DFLAG_PIO;
  93                }
  94        }
  95        return 0;
  96}
  97
  98static struct scsi_host_template generic_sht = {
  99        ATA_BMDMA_SHT(DRV_NAME),
 100};
 101
 102static struct ata_port_operations generic_port_ops = {
 103        .inherits       = &ata_bmdma_port_ops,
 104        .cable_detect   = ata_cable_unknown,
 105        .set_mode       = generic_set_mode,
 106};
 107
 108static int all_generic_ide;             /* Set to claim all devices */
 109
 110/**
 111 *      is_intel_ider           -       identify intel IDE-R devices
 112 *      @dev: PCI device
 113 *
 114 *      Distinguish Intel IDE-R controller devices from other Intel IDE
 115 *      devices. IDE-R devices have no timing registers and are in
 116 *      most respects virtual. They should be driven by the ata_generic
 117 *      driver.
 118 *
 119 *      IDE-R devices have PCI offset 0xF8.L as zero, later Intel ATA has
 120 *      it non zero. All Intel ATA has 0x40 writable (timing), but it is
 121 *      not writable on IDE-R devices (this is guaranteed).
 122 */
 123
 124static int is_intel_ider(struct pci_dev *dev)
 125{
 126        /* For Intel IDE the value at 0xF8 is only zero on IDE-R
 127           interfaces */
 128        u32 r;
 129        u16 t;
 130
 131        /* Check the manufacturing ID, it will be zero for IDE-R */
 132        pci_read_config_dword(dev, 0xF8, &r);
 133        /* Not IDE-R: punt so that ata_(old)piix gets it */
 134        if (r != 0)
 135                return 0;
 136        /* 0xF8 will also be zero on some early Intel IDE devices
 137           but they will have a sane timing register */
 138        pci_read_config_word(dev, 0x40, &t);
 139        if (t != 0)
 140                return 0;
 141        /* Finally check if the timing register is writable so that
 142           we eliminate any early devices hot-docked in a docking
 143           station */
 144        pci_write_config_word(dev, 0x40, 1);
 145        pci_read_config_word(dev, 0x40, &t);
 146        if (t) {
 147                pci_write_config_word(dev, 0x40, 0);
 148                return 0;
 149        }
 150        return 1;
 151}
 152
 153/**
 154 *      ata_generic_init_one            -       attach generic IDE
 155 *      @dev: PCI device found
 156 *      @id: match entry
 157 *
 158 *      Called each time a matching IDE interface is found. We check if the
 159 *      interface is one we wish to claim and if so we perform any chip
 160 *      specific hacks then let the ATA layer do the heavy lifting.
 161 */
 162
 163static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 164{
 165        u16 command;
 166        static const struct ata_port_info info = {
 167                .flags = ATA_FLAG_SLAVE_POSS,
 168                .pio_mask = ATA_PIO4,
 169                .mwdma_mask = ATA_MWDMA2,
 170                .udma_mask = ATA_UDMA5,
 171                .port_ops = &generic_port_ops
 172        };
 173        const struct ata_port_info *ppi[] = { &info, NULL };
 174
 175        /* Don't use the generic entry unless instructed to do so */
 176        if ((id->driver_data & ATA_GEN_CLASS_MATCH) && all_generic_ide == 0)
 177                return -ENODEV;
 178
 179        if ((id->driver_data & ATA_GEN_INTEL_IDER) && !all_generic_ide)
 180                if (!is_intel_ider(dev))
 181                        return -ENODEV;
 182
 183        /* Devices that need care */
 184        if (dev->vendor == PCI_VENDOR_ID_UMC &&
 185            dev->device == PCI_DEVICE_ID_UMC_UM8886A &&
 186            (!(PCI_FUNC(dev->devfn) & 1)))
 187                return -ENODEV;
 188
 189        if (dev->vendor == PCI_VENDOR_ID_OPTI &&
 190            dev->device == PCI_DEVICE_ID_OPTI_82C558 &&
 191            (!(PCI_FUNC(dev->devfn) & 1)))
 192                return -ENODEV;
 193
 194        /* Don't re-enable devices in generic mode or we will break some
 195           motherboards with disabled and unused IDE controllers */
 196        pci_read_config_word(dev, PCI_COMMAND, &command);
 197        if (!(command & PCI_COMMAND_IO))
 198                return -ENODEV;
 199
 200        if (dev->vendor == PCI_VENDOR_ID_AL)
 201                ata_pci_bmdma_clear_simplex(dev);
 202
 203        if (dev->vendor == PCI_VENDOR_ID_ATI) {
 204                int rc = pcim_enable_device(dev);
 205                if (rc < 0)
 206                        return rc;
 207                pcim_pin_device(dev);
 208        }
 209        return ata_pci_bmdma_init_one(dev, ppi, &generic_sht, (void *)id, 0);
 210}
 211
 212static struct pci_device_id ata_generic[] = {
 213        { PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
 214        { PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
 215        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8673F), },
 216        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886A), },
 217        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886BF), },
 218        { PCI_DEVICE(PCI_VENDOR_ID_HINT,   PCI_DEVICE_ID_HINT_VXPROII_IDE), },
 219        { PCI_DEVICE(PCI_VENDOR_ID_VIA,    PCI_DEVICE_ID_VIA_82C561), },
 220        { PCI_DEVICE(PCI_VENDOR_ID_OPTI,   PCI_DEVICE_ID_OPTI_82C558), },
 221        { PCI_DEVICE(PCI_VENDOR_ID_CENATEK,PCI_DEVICE_ID_CENATEK_IDE),
 222          .driver_data = ATA_GEN_FORCE_DMA },
 223#if !defined(CONFIG_PATA_TOSHIBA) && !defined(CONFIG_PATA_TOSHIBA_MODULE)
 224        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
 225        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2),  },
 226        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_3),  },
 227        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_5),  },
 228#endif
 229        /* Intel, IDE class device */
 230        { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 231          PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL,
 232          .driver_data = ATA_GEN_INTEL_IDER },
 233        /* Must come last. If you add entries adjust this table appropriately */
 234        { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL),
 235          .driver_data = ATA_GEN_CLASS_MATCH },
 236        { 0, },
 237};
 238
 239static struct pci_driver ata_generic_pci_driver = {
 240        .name           = DRV_NAME,
 241        .id_table       = ata_generic,
 242        .probe          = ata_generic_init_one,
 243        .remove         = ata_pci_remove_one,
 244#ifdef CONFIG_PM_SLEEP
 245        .suspend        = ata_pci_device_suspend,
 246        .resume         = ata_pci_device_resume,
 247#endif
 248};
 249
 250module_pci_driver(ata_generic_pci_driver);
 251
 252MODULE_AUTHOR("Alan Cox");
 253MODULE_DESCRIPTION("low-level driver for generic ATA");
 254MODULE_LICENSE("GPL");
 255MODULE_DEVICE_TABLE(pci, ata_generic);
 256MODULE_VERSION(DRV_VERSION);
 257
 258module_param(all_generic_ide, int, 0);
 259