LXR linux/drivers/ata/ata

   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
  35/**
  36 *      generic_set_mode        -       mode setting
  37 *      @link: link to set up
  38 *      @unused: returned device on error
  39 *
  40 *      Use a non standard set_mode function. We don't want to be tuned.
  41 *      The BIOS configured everything. Our job is not to fiddle. We
  42 *      read the dma enabled bits from the PCI configuration of the device
  43 *      and respect them.
  44 */
  45
  46static int generic_set_mode(struct ata_link *link, struct ata_device **unused)
  47{
  48        struct ata_port *ap = link->ap;
  49        int dma_enabled = 0;
  50        struct ata_device *dev;
  51        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  52
  53        /* Bits 5 and 6 indicate if DMA is active on master/slave */
  54        if (ap->ioaddr.bmdma_addr)
  55                dma_enabled = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
  56
  57        if (pdev->vendor == PCI_VENDOR_ID_CENATEK)
  58                dma_enabled = 0xFF;
  59
  60        ata_link_for_each_dev(dev, link) {
  61                if (!ata_dev_enabled(dev))
  62                        continue;
  63
  64                /* We don't really care */
  65                dev->pio_mode = XFER_PIO_0;
  66                dev->dma_mode = XFER_MW_DMA_0;
  67                /* We do need the right mode information for DMA or PIO
  68                   and this comes from the current configuration flags */
  69                if (dma_enabled & (1 << (5 + dev->devno))) {
  70                        unsigned int xfer_mask = ata_id_xfermask(dev->id);
  71                        const char *name;
  72
  73                        if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
  74                                name = ata_mode_string(xfer_mask);
  75                        else {
  76                                /* SWDMA perhaps? */
  77                                name = "DMA";
  78                                xfer_mask |= ata_xfer_mode2mask(XFER_MW_DMA_0);
  79                        }
  80
  81                        ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
  82                                       name);
  83
  84                        dev->xfer_mode = ata_xfer_mask2mode(xfer_mask);
  85                        dev->xfer_shift = ata_xfer_mode2shift(dev->xfer_mode);
  86                        dev->flags &= ~ATA_DFLAG_PIO;
  87                } else {
  88                        ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
  89                        dev->xfer_mode = XFER_PIO_0;
  90                        dev->xfer_shift = ATA_SHIFT_PIO;
  91                        dev->flags |= ATA_DFLAG_PIO;
  92                }
  93        }
  94        return 0;
  95}
  96
  97static struct scsi_host_template generic_sht = {
  98        ATA_BMDMA_SHT(DRV_NAME),
  99};
 100
 101static struct ata_port_operations generic_port_ops = {
 102        .inherits       = &ata_bmdma_port_ops,
 103        .cable_detect   = ata_cable_unknown,
 104        .set_mode       = generic_set_mode,
 105};
 106
 107static int all_generic_ide;             /* Set to claim all devices */
 108
 109/**
 110 *      ata_generic_init                -       attach generic IDE
 111 *      @dev: PCI device found
 112 *      @id: match entry
 113 *
 114 *      Called each time a matching IDE interface is found. We check if the
 115 *      interface is one we wish to claim and if so we perform any chip
 116 *      specific hacks then let the ATA layer do the heavy lifting.
 117 */
 118
 119static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 120{
 121        u16 command;
 122        static const struct ata_port_info info = {
 123                .flags = ATA_FLAG_SLAVE_POSS,
 124                .pio_mask = 0x1f,
 125                .mwdma_mask = 0x07,
 126                .udma_mask = ATA_UDMA5,
 127                .port_ops = &generic_port_ops
 128        };
 129        const struct ata_port_info *ppi[] = { &info, NULL };
 130
 131        /* Don't use the generic entry unless instructed to do so */
 132        if (id->driver_data == 1 && all_generic_ide == 0)
 133                return -ENODEV;
 134
 135        /* Devices that need care */
 136        if (dev->vendor == PCI_VENDOR_ID_UMC &&
 137            dev->device == PCI_DEVICE_ID_UMC_UM8886A &&
 138            (!(PCI_FUNC(dev->devfn) & 1)))
 139                return -ENODEV;
 140
 141        if (dev->vendor == PCI_VENDOR_ID_OPTI &&
 142            dev->device == PCI_DEVICE_ID_OPTI_82C558 &&
 143            (!(PCI_FUNC(dev->devfn) & 1)))
 144                return -ENODEV;
 145
 146        /* Don't re-enable devices in generic mode or we will break some
 147           motherboards with disabled and unused IDE controllers */
 148        pci_read_config_word(dev, PCI_COMMAND, &command);
 149        if (!(command & PCI_COMMAND_IO))
 150                return -ENODEV;
 151
 152        if (dev->vendor == PCI_VENDOR_ID_AL)
 153                ata_pci_bmdma_clear_simplex(dev);
 154
 155        if (dev->vendor == PCI_VENDOR_ID_ATI) {
 156                int rc = pcim_enable_device(dev);
 157                if (rc < 0)
 158                        return rc;
 159                pcim_pin_device(dev);
 160        }
 161        return ata_pci_sff_init_one(dev, ppi, &generic_sht, NULL);
 162}
 163
 164static struct pci_device_id ata_generic[] = {
 165        { PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
 166        { PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
 167        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8673F), },
 168        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886A), },
 169        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886BF), },
 170        { PCI_DEVICE(PCI_VENDOR_ID_HINT,   PCI_DEVICE_ID_HINT_VXPROII_IDE), },
 171        { PCI_DEVICE(PCI_VENDOR_ID_VIA,    PCI_DEVICE_ID_VIA_82C561), },
 172        { PCI_DEVICE(PCI_VENDOR_ID_OPTI,   PCI_DEVICE_ID_OPTI_82C558), },
 173        { PCI_DEVICE(PCI_VENDOR_ID_CENATEK,PCI_DEVICE_ID_CENATEK_IDE), },
 174        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO), },
 175        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
 176        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2),  },
 177        /* Must come last. If you add entries adjust this table appropriately */
 178        { PCI_ANY_ID,           PCI_ANY_ID,                        PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
 179        { 0, },
 180};
 181
 182static struct pci_driver ata_generic_pci_driver = {
 183        .name           = DRV_NAME,
 184        .id_table       = ata_generic,
 185        .probe          = ata_generic_init_one,
 186        .remove         = ata_pci_remove_one,
 187#ifdef CONFIG_PM
 188        .suspend        = ata_pci_device_suspend,
 189        .resume         = ata_pci_device_resume,
 190#endif
 191};
 192
 193static int __init ata_generic_init(void)
 194{
 195        return pci_register_driver(&ata_generic_pci_driver);
 196}
 197
 198
 199static void __exit ata_generic_exit(void)
 200{
 201        pci_unregister_driver(&ata_generic_pci_driver);
 202}
 203
 204
 205MODULE_AUTHOR("Alan Cox");
 206MODULE_DESCRIPTION("low-level driver for generic ATA");
 207MODULE_LICENSE("GPL");
 208MODULE_DEVICE_TABLE(pci, ata_generic);
 209MODULE_VERSION(DRV_VERSION);
 210
 211module_init(ata_generic_init);
 212module_exit(ata_generic_exit);
 213
 214module_param(all_generic_ide, int, 0);
 215