linux/drivers/ata/ata_generic.c
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   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/init.h>
  23#include <linux/blkdev.h>
  24#include <linux/delay.h>
  25#include <scsi/scsi_host.h>
  26#include <linux/libata.h>
  27
  28#define DRV_NAME "ata_generic"
  29#define DRV_VERSION "0.2.15"
  30
  31/*
  32 *      A generic parallel ATA driver using libata
  33 */
  34
  35enum {
  36        ATA_GEN_CLASS_MATCH             = (1 << 0),
  37        ATA_GEN_FORCE_DMA               = (1 << 1),
  38        ATA_GEN_INTEL_IDER              = (1 << 2),
  39};
  40
  41/**
  42 *      generic_set_mode        -       mode setting
  43 *      @link: link to set up
  44 *      @unused: returned device on error
  45 *
  46 *      Use a non standard set_mode function. We don't want to be tuned.
  47 *      The BIOS configured everything. Our job is not to fiddle. We
  48 *      read the dma enabled bits from the PCI configuration of the device
  49 *      and respect them.
  50 */
  51
  52static int generic_set_mode(struct ata_link *link, struct ata_device **unused)
  53{
  54        struct ata_port *ap = link->ap;
  55        const struct pci_device_id *id = ap->host->private_data;
  56        int dma_enabled = 0;
  57        struct ata_device *dev;
  58
  59        if (id->driver_data & ATA_GEN_FORCE_DMA) {
  60                dma_enabled = 0xff;
  61        } else if (ap->ioaddr.bmdma_addr) {
  62                /* Bits 5 and 6 indicate if DMA is active on master/slave */
  63                dma_enabled = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
  64        }
  65
  66        ata_for_each_dev(dev, link, ENABLED) {
  67                /* We don't really care */
  68                dev->pio_mode = XFER_PIO_0;
  69                dev->dma_mode = XFER_MW_DMA_0;
  70                /* We do need the right mode information for DMA or PIO
  71                   and this comes from the current configuration flags */
  72                if (dma_enabled & (1 << (5 + dev->devno))) {
  73                        unsigned int xfer_mask = ata_id_xfermask(dev->id);
  74                        const char *name;
  75
  76                        if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
  77                                name = ata_mode_string(xfer_mask);
  78                        else {
  79                                /* SWDMA perhaps? */
  80                                name = "DMA";
  81                                xfer_mask |= ata_xfer_mode2mask(XFER_MW_DMA_0);
  82                        }
  83
  84                        ata_dev_info(dev, "configured for %s\n", name);
  85
  86                        dev->xfer_mode = ata_xfer_mask2mode(xfer_mask);
  87                        dev->xfer_shift = ata_xfer_mode2shift(dev->xfer_mode);
  88                        dev->flags &= ~ATA_DFLAG_PIO;
  89                } else {
  90                        ata_dev_info(dev, "configured for PIO\n");
  91                        dev->xfer_mode = XFER_PIO_0;
  92                        dev->xfer_shift = ATA_SHIFT_PIO;
  93                        dev->flags |= ATA_DFLAG_PIO;
  94                }
  95        }
  96        return 0;
  97}
  98
  99static struct scsi_host_template generic_sht = {
 100        ATA_BMDMA_SHT(DRV_NAME),
 101};
 102
 103static struct ata_port_operations generic_port_ops = {
 104        .inherits       = &ata_bmdma_port_ops,
 105        .cable_detect   = ata_cable_unknown,
 106        .set_mode       = generic_set_mode,
 107};
 108
 109static int all_generic_ide;             /* Set to claim all devices */
 110
 111/**
 112 *      is_intel_ider           -       identify intel IDE-R devices
 113 *      @dev: PCI device
 114 *
 115 *      Distinguish Intel IDE-R controller devices from other Intel IDE
 116 *      devices. IDE-R devices have no timing registers and are in
 117 *      most respects virtual. They should be driven by the ata_generic
 118 *      driver.
 119 *
 120 *      IDE-R devices have PCI offset 0xF8.L as zero, later Intel ATA has
 121 *      it non zero. All Intel ATA has 0x40 writable (timing), but it is
 122 *      not writable on IDE-R devices (this is guaranteed).
 123 */
 124
 125static int is_intel_ider(struct pci_dev *dev)
 126{
 127        /* For Intel IDE the value at 0xF8 is only zero on IDE-R
 128           interfaces */
 129        u32 r;
 130        u16 t;
 131
 132        /* Check the manufacturing ID, it will be zero for IDE-R */
 133        pci_read_config_dword(dev, 0xF8, &r);
 134        /* Not IDE-R: punt so that ata_(old)piix gets it */
 135        if (r != 0)
 136                return 0;
 137        /* 0xF8 will also be zero on some early Intel IDE devices
 138           but they will have a sane timing register */
 139        pci_read_config_word(dev, 0x40, &t);
 140        if (t != 0)
 141                return 0;
 142        /* Finally check if the timing register is writable so that
 143           we eliminate any early devices hot-docked in a docking
 144           station */
 145        pci_write_config_word(dev, 0x40, 1);
 146        pci_read_config_word(dev, 0x40, &t);
 147        if (t) {
 148                pci_write_config_word(dev, 0x40, 0);
 149                return 0;
 150        }
 151        return 1;
 152}
 153
 154/**
 155 *      ata_generic_init                -       attach generic IDE
 156 *      @dev: PCI device found
 157 *      @id: match entry
 158 *
 159 *      Called each time a matching IDE interface is found. We check if the
 160 *      interface is one we wish to claim and if so we perform any chip
 161 *      specific hacks then let the ATA layer do the heavy lifting.
 162 */
 163
 164static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 165{
 166        u16 command;
 167        static const struct ata_port_info info = {
 168                .flags = ATA_FLAG_SLAVE_POSS,
 169                .pio_mask = ATA_PIO4,
 170                .mwdma_mask = ATA_MWDMA2,
 171                .udma_mask = ATA_UDMA5,
 172                .port_ops = &generic_port_ops
 173        };
 174        const struct ata_port_info *ppi[] = { &info, NULL };
 175
 176        /* Don't use the generic entry unless instructed to do so */
 177        if ((id->driver_data & ATA_GEN_CLASS_MATCH) && all_generic_ide == 0)
 178                return -ENODEV;
 179
 180        if ((id->driver_data & ATA_GEN_INTEL_IDER) && !all_generic_ide)
 181                if (!is_intel_ider(dev))
 182                        return -ENODEV;
 183
 184        /* Devices that need care */
 185        if (dev->vendor == PCI_VENDOR_ID_UMC &&
 186            dev->device == PCI_DEVICE_ID_UMC_UM8886A &&
 187            (!(PCI_FUNC(dev->devfn) & 1)))
 188                return -ENODEV;
 189
 190        if (dev->vendor == PCI_VENDOR_ID_OPTI &&
 191            dev->device == PCI_DEVICE_ID_OPTI_82C558 &&
 192            (!(PCI_FUNC(dev->devfn) & 1)))
 193                return -ENODEV;
 194
 195        /* Don't re-enable devices in generic mode or we will break some
 196           motherboards with disabled and unused IDE controllers */
 197        pci_read_config_word(dev, PCI_COMMAND, &command);
 198        if (!(command & PCI_COMMAND_IO))
 199                return -ENODEV;
 200
 201        if (dev->vendor == PCI_VENDOR_ID_AL)
 202                ata_pci_bmdma_clear_simplex(dev);
 203
 204        if (dev->vendor == PCI_VENDOR_ID_ATI) {
 205                int rc = pcim_enable_device(dev);
 206                if (rc < 0)
 207                        return rc;
 208                pcim_pin_device(dev);
 209        }
 210        return ata_pci_bmdma_init_one(dev, ppi, &generic_sht, (void *)id, 0);
 211}
 212
 213static struct pci_device_id ata_generic[] = {
 214        { PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
 215        { PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
 216        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8673F), },
 217        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886A), },
 218        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886BF), },
 219        { PCI_DEVICE(PCI_VENDOR_ID_HINT,   PCI_DEVICE_ID_HINT_VXPROII_IDE), },
 220        { PCI_DEVICE(PCI_VENDOR_ID_VIA,    PCI_DEVICE_ID_VIA_82C561), },
 221        { PCI_DEVICE(PCI_VENDOR_ID_OPTI,   PCI_DEVICE_ID_OPTI_82C558), },
 222        { PCI_DEVICE(PCI_VENDOR_ID_CENATEK,PCI_DEVICE_ID_CENATEK_IDE),
 223          .driver_data = ATA_GEN_FORCE_DMA },
 224        /*
 225         * For some reason, MCP89 on MacBook 7,1 doesn't work with
 226         * ahci, use ata_generic instead.
 227         */
 228        { PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP89_SATA,
 229          PCI_VENDOR_ID_APPLE, 0xcb89,
 230          .driver_data = ATA_GEN_FORCE_DMA },
 231#if !defined(CONFIG_PATA_TOSHIBA) && !defined(CONFIG_PATA_TOSHIBA_MODULE)
 232        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
 233        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2),  },
 234        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_3),  },
 235        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_5),  },
 236#endif
 237        /* Intel, IDE class device */
 238        { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 239          PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL,
 240          .driver_data = ATA_GEN_INTEL_IDER },
 241        /* Must come last. If you add entries adjust this table appropriately */
 242        { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL),
 243          .driver_data = ATA_GEN_CLASS_MATCH },
 244        { 0, },
 245};
 246
 247static struct pci_driver ata_generic_pci_driver = {
 248        .name           = DRV_NAME,
 249        .id_table       = ata_generic,
 250        .probe          = ata_generic_init_one,
 251        .remove         = ata_pci_remove_one,
 252#ifdef CONFIG_PM
 253        .suspend        = ata_pci_device_suspend,
 254        .resume         = ata_pci_device_resume,
 255#endif
 256};
 257
 258module_pci_driver(ata_generic_pci_driver);
 259
 260MODULE_AUTHOR("Alan Cox");
 261MODULE_DESCRIPTION("low-level driver for generic ATA");
 262MODULE_LICENSE("GPL");
 263MODULE_DEVICE_TABLE(pci, ata_generic);
 264MODULE_VERSION(DRV_VERSION);
 265
 266module_param(all_generic_ide, int, 0);
 267
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