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_for_each_dev(dev, link, ENABLED) {
  61                /* We don't really care */
  62                dev->pio_mode = XFER_PIO_0;
  63                dev->dma_mode = XFER_MW_DMA_0;
  64                /* We do need the right mode information for DMA or PIO
  65                   and this comes from the current configuration flags */
  66                if (dma_enabled & (1 << (5 + dev->devno))) {
  67                        unsigned int xfer_mask = ata_id_xfermask(dev->id);
  68                        const char *name;
  69
  70                        if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
  71                                name = ata_mode_string(xfer_mask);
  72                        else {
  73                                /* SWDMA perhaps? */
  74                                name = "DMA";
  75                                xfer_mask |= ata_xfer_mode2mask(XFER_MW_DMA_0);
  76                        }
  77
  78                        ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
  79                                       name);
  80
  81                        dev->xfer_mode = ata_xfer_mask2mode(xfer_mask);
  82                        dev->xfer_shift = ata_xfer_mode2shift(dev->xfer_mode);
  83                        dev->flags &= ~ATA_DFLAG_PIO;
  84                } else {
  85                        ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
  86                        dev->xfer_mode = XFER_PIO_0;
  87                        dev->xfer_shift = ATA_SHIFT_PIO;
  88                        dev->flags |= ATA_DFLAG_PIO;
  89                }
  90        }
  91        return 0;
  92}
  93
  94static struct scsi_host_template generic_sht = {
  95        ATA_BMDMA_SHT(DRV_NAME),
  96};
  97
  98static struct ata_port_operations generic_port_ops = {
  99        .inherits       = &ata_bmdma_port_ops,
 100        .cable_detect   = ata_cable_unknown,
 101        .set_mode       = generic_set_mode,
 102};
 103
 104static int all_generic_ide;             /* Set to claim all devices */
 105
 106/**
 107 *      ata_generic_init                -       attach generic IDE
 108 *      @dev: PCI device found
 109 *      @id: match entry
 110 *
 111 *      Called each time a matching IDE interface is found. We check if the
 112 *      interface is one we wish to claim and if so we perform any chip
 113 *      specific hacks then let the ATA layer do the heavy lifting.
 114 */
 115
 116static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 117{
 118        u16 command;
 119        static const struct ata_port_info info = {
 120                .flags = ATA_FLAG_SLAVE_POSS,
 121                .pio_mask = ATA_PIO4,
 122                .mwdma_mask = ATA_MWDMA2,
 123                .udma_mask = ATA_UDMA5,
 124                .port_ops = &generic_port_ops
 125        };
 126        const struct ata_port_info *ppi[] = { &info, NULL };
 127
 128        /* Don't use the generic entry unless instructed to do so */
 129        if (id->driver_data == 1 && all_generic_ide == 0)
 130                return -ENODEV;
 131
 132        /* Devices that need care */
 133        if (dev->vendor == PCI_VENDOR_ID_UMC &&
 134            dev->device == PCI_DEVICE_ID_UMC_UM8886A &&
 135            (!(PCI_FUNC(dev->devfn) & 1)))
 136                return -ENODEV;
 137
 138        if (dev->vendor == PCI_VENDOR_ID_OPTI &&
 139            dev->device == PCI_DEVICE_ID_OPTI_82C558 &&
 140            (!(PCI_FUNC(dev->devfn) & 1)))
 141                return -ENODEV;
 142
 143        /* Don't re-enable devices in generic mode or we will break some
 144           motherboards with disabled and unused IDE controllers */
 145        pci_read_config_word(dev, PCI_COMMAND, &command);
 146        if (!(command & PCI_COMMAND_IO))
 147                return -ENODEV;
 148
 149        if (dev->vendor == PCI_VENDOR_ID_AL)
 150                ata_pci_bmdma_clear_simplex(dev);
 151
 152        if (dev->vendor == PCI_VENDOR_ID_ATI) {
 153                int rc = pcim_enable_device(dev);
 154                if (rc < 0)
 155                        return rc;
 156                pcim_pin_device(dev);
 157        }
 158        return ata_pci_sff_init_one(dev, ppi, &generic_sht, NULL);
 159}
 160
 161static struct pci_device_id ata_generic[] = {
 162        { PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
 163        { PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
 164        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8673F), },
 165        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886A), },
 166        { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886BF), },
 167        { PCI_DEVICE(PCI_VENDOR_ID_HINT,   PCI_DEVICE_ID_HINT_VXPROII_IDE), },
 168        { PCI_DEVICE(PCI_VENDOR_ID_VIA,    PCI_DEVICE_ID_VIA_82C561), },
 169        { PCI_DEVICE(PCI_VENDOR_ID_OPTI,   PCI_DEVICE_ID_OPTI_82C558), },
 170        { PCI_DEVICE(PCI_VENDOR_ID_CENATEK,PCI_DEVICE_ID_CENATEK_IDE), },
 171        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO), },
 172        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
 173        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2),  },
 174        /* Must come last. If you add entries adjust this table appropriately */
 175        { PCI_ANY_ID,           PCI_ANY_ID,                        PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
 176        { 0, },
 177};
 178
 179static struct pci_driver ata_generic_pci_driver = {
 180        .name           = DRV_NAME,
 181        .id_table       = ata_generic,
 182        .probe          = ata_generic_init_one,
 183        .remove         = ata_pci_remove_one,
 184#ifdef CONFIG_PM
 185        .suspend        = ata_pci_device_suspend,
 186        .resume         = ata_pci_device_resume,
 187#endif
 188};
 189
 190static int __init ata_generic_init(void)
 191{
 192        return pci_register_driver(&ata_generic_pci_driver);
 193}
 194
 195
 196static void __exit ata_generic_exit(void)
 197{
 198        pci_unregister_driver(&ata_generic_pci_driver);
 199}
 200
 201
 202MODULE_AUTHOR("Alan Cox");
 203MODULE_DESCRIPTION("low-level driver for generic ATA");
 204MODULE_LICENSE("GPL");
 205MODULE_DEVICE_TABLE(pci, ata_generic);
 206MODULE_VERSION(DRV_VERSION);
 207
 208module_init(ata_generic_init);
 209module_exit(ata_generic_exit);
 210
 211module_param(all_generic_ide, int, 0);
 212