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ata_generic.c

/*
 *  ata_generic.c - Generic PATA/SATA controller driver.
 *  Copyright 2005 Red Hat Inc <alan@redhat.com>, all rights reserved.
 *
 *  Elements from ide/pci/generic.c
 *        Copyright (C) 2001-2002   Andre Hedrick <andre@linux-ide.org>
 *        Portions (C) Copyright 2002  Red Hat Inc <alan@redhat.com>
 *
 *  May be copied or modified under the terms of the GNU General Public License
 *
 *  Driver for PCI IDE interfaces implementing the standard bus mastering
 *  interface functionality. This assumes the BIOS did the drive set up and
 *  tuning for us. By default we do not grab all IDE class devices as they
 *  may have other drivers or need fixups to avoid problems. Instead we keep
 *  a default list of stuff without documentation/driver that appears to
 *  work.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>

#define DRV_NAME "ata_generic"
#define DRV_VERSION "0.2.13"

/*
 *    A generic parallel ATA driver using libata
 */

/**
 *    generic_set_mode  -     mode setting
 *    @link: link to set up
 *    @unused: returned device on error
 *
 *    Use a non standard set_mode function. We don't want to be tuned.
 *    The BIOS configured everything. Our job is not to fiddle. We
 *    read the dma enabled bits from the PCI configuration of the device
 *    and respect them.
 */

static int generic_set_mode(struct ata_link *link, struct ata_device **unused)
{
      struct ata_port *ap = link->ap;
      int dma_enabled = 0;
      struct ata_device *dev;

      /* Bits 5 and 6 indicate if DMA is active on master/slave */
      if (ap->ioaddr.bmdma_addr)
            dma_enabled = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);

      ata_link_for_each_dev(dev, link) {
            if (ata_dev_enabled(dev)) {
                  /* We don't really care */
                  dev->pio_mode = XFER_PIO_0;
                  dev->dma_mode = XFER_MW_DMA_0;
                  /* We do need the right mode information for DMA or PIO
                     and this comes from the current configuration flags */
                  if (dma_enabled & (1 << (5 + dev->devno))) {
                        ata_id_to_dma_mode(dev, XFER_MW_DMA_0);
                        dev->flags &= ~ATA_DFLAG_PIO;
                  } else {
                        ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
                        dev->xfer_mode = XFER_PIO_0;
                        dev->xfer_shift = ATA_SHIFT_PIO;
                        dev->flags |= ATA_DFLAG_PIO;
                  }
            }
      }
      return 0;
}

static struct scsi_host_template generic_sht = {
      .module                 = THIS_MODULE,
      .name             = DRV_NAME,
      .ioctl                  = ata_scsi_ioctl,
      .queuecommand           = ata_scsi_queuecmd,
      .can_queue        = ATA_DEF_QUEUE,
      .this_id          = ATA_SHT_THIS_ID,
      .sg_tablesize           = LIBATA_MAX_PRD,
      .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
      .emulated         = ATA_SHT_EMULATED,
      .use_clustering         = ATA_SHT_USE_CLUSTERING,
      .proc_name        = DRV_NAME,
      .dma_boundary           = ATA_DMA_BOUNDARY,
      .slave_configure  = ata_scsi_slave_config,
      .slave_destroy          = ata_scsi_slave_destroy,
      .bios_param       = ata_std_bios_param,
};

static struct ata_port_operations generic_port_ops = {
      .set_mode   = generic_set_mode,

      .tf_load    = ata_tf_load,
      .tf_read    = ata_tf_read,
      .check_status     = ata_check_status,
      .exec_command     = ata_exec_command,
      .dev_select       = ata_std_dev_select,

      .bmdma_setup      = ata_bmdma_setup,
      .bmdma_start      = ata_bmdma_start,
      .bmdma_stop = ata_bmdma_stop,
      .bmdma_status     = ata_bmdma_status,

      .data_xfer  = ata_data_xfer,

      .freeze           = ata_bmdma_freeze,
      .thaw       = ata_bmdma_thaw,
      .error_handler    = ata_bmdma_error_handler,
      .post_internal_cmd = ata_bmdma_post_internal_cmd,
      .cable_detect     = ata_cable_unknown,

      .qc_prep    = ata_qc_prep,
      .qc_issue   = ata_qc_issue_prot,

      .irq_handler      = ata_interrupt,
      .irq_clear  = ata_bmdma_irq_clear,
      .irq_on           = ata_irq_on,

      .port_start = ata_sff_port_start,
};

static int all_generic_ide;         /* Set to claim all devices */

/**
 *    ata_generic_init        -     attach generic IDE
 *    @dev: PCI device found
 *    @id: match entry
 *
 *    Called each time a matching IDE interface is found. We check if the
 *    interface is one we wish to claim and if so we perform any chip
 *    specific hacks then let the ATA layer do the heavy lifting.
 */

static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
      u16 command;
      static const struct ata_port_info info = {
            .sht = &generic_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x07,
            .udma_mask = ATA_UDMA5,
            .port_ops = &generic_port_ops
      };
      const struct ata_port_info *ppi[] = { &info, NULL };

      /* Don't use the generic entry unless instructed to do so */
      if (id->driver_data == 1 && all_generic_ide == 0)
            return -ENODEV;

      /* Devices that need care */
      if (dev->vendor == PCI_VENDOR_ID_UMC &&
          dev->device == PCI_DEVICE_ID_UMC_UM8886A &&
          (!(PCI_FUNC(dev->devfn) & 1)))
            return -ENODEV;

      if (dev->vendor == PCI_VENDOR_ID_OPTI &&
          dev->device == PCI_DEVICE_ID_OPTI_82C558 &&
          (!(PCI_FUNC(dev->devfn) & 1)))
            return -ENODEV;

      /* Don't re-enable devices in generic mode or we will break some
         motherboards with disabled and unused IDE controllers */
      pci_read_config_word(dev, PCI_COMMAND, &command);
      if (!(command & PCI_COMMAND_IO))
            return -ENODEV;

      if (dev->vendor == PCI_VENDOR_ID_AL)
            ata_pci_clear_simplex(dev);

      return ata_pci_init_one(dev, ppi);
}

static struct pci_device_id ata_generic[] = {
      { PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
      { PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
      { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8673F), },
      { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886A), },
      { PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886BF), },
      { PCI_DEVICE(PCI_VENDOR_ID_HINT,   PCI_DEVICE_ID_HINT_VXPROII_IDE), },
      { PCI_DEVICE(PCI_VENDOR_ID_VIA,    PCI_DEVICE_ID_VIA_82C561), },
      { PCI_DEVICE(PCI_VENDOR_ID_OPTI,   PCI_DEVICE_ID_OPTI_82C558), },
      { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO), },
      { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
      { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2),  },
      /* Must come last. If you add entries adjust this table appropriately */
      { PCI_ANY_ID,           PCI_ANY_ID,                PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
      { 0, },
};

static struct pci_driver ata_generic_pci_driver = {
      .name             = DRV_NAME,
      .id_table   = ata_generic,
      .probe            = ata_generic_init_one,
      .remove           = ata_pci_remove_one,
#ifdef CONFIG_PM
      .suspend    = ata_pci_device_suspend,
      .resume           = ata_pci_device_resume,
#endif
};

static int __init ata_generic_init(void)
{
      return pci_register_driver(&ata_generic_pci_driver);
}


static void __exit ata_generic_exit(void)
{
      pci_unregister_driver(&ata_generic_pci_driver);
}


MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for generic ATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ata_generic);
MODULE_VERSION(DRV_VERSION);

module_init(ata_generic_init);
module_exit(ata_generic_exit);

module_param(all_generic_ide, int, 0);

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