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pata_isapnp.c

/*
 *   pata-isapnp.c - ISA PnP PATA controller driver.
 *   Copyright 2005/2006 Red Hat Inc <alan@redhat.com>, all rights reserved.
 *
 *   Based in part on ide-pnp.c by Andrey Panin <pazke@donpac.ru>
 */

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

#define DRV_NAME "pata_isapnp"
#define DRV_VERSION "0.2.2"

static struct scsi_host_template isapnp_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 isapnp_port_ops = {
      .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,

      .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_40wire,

      .qc_prep    = ata_qc_prep,
      .qc_issue   = ata_qc_issue_prot,

      .data_xfer  = ata_data_xfer,

      .irq_clear  = ata_bmdma_irq_clear,
      .irq_on           = ata_irq_on,

      .port_start = ata_sff_port_start,
};

/**
 *    isapnp_init_one         -     attach an isapnp interface
 *    @idev: PnP device
 *    @dev_id: matching detect line
 *
 *    Register an ISA bus IDE interface. Such interfaces are PIO 0 and
 *    non shared IRQ.
 */

static int isapnp_init_one(struct pnp_dev *idev, const struct pnp_device_id *dev_id)
{
      struct ata_host *host;
      struct ata_port *ap;
      void __iomem *cmd_addr, *ctl_addr;
      int irq = 0;
      irq_handler_t handler = NULL;

      if (pnp_port_valid(idev, 0) == 0)
            return -ENODEV;

      if (pnp_irq_valid(idev, 0)) {
            irq = pnp_irq(idev, 0);
            handler = ata_interrupt;
      }

      /* allocate host */
      host = ata_host_alloc(&idev->dev, 1);
      if (!host)
            return -ENOMEM;

      /* acquire resources and fill host */
      cmd_addr = devm_ioport_map(&idev->dev, pnp_port_start(idev, 0), 8);
      if (!cmd_addr)
            return -ENOMEM;

      ap = host->ports[0];

      ap->ops = &isapnp_port_ops;
      ap->pio_mask = 1;
      ap->flags |= ATA_FLAG_SLAVE_POSS;

      ap->ioaddr.cmd_addr = cmd_addr;

      if (pnp_port_valid(idev, 1) == 0) {
            ctl_addr = devm_ioport_map(&idev->dev,
                                 pnp_port_start(idev, 1), 1);
            ap->ioaddr.altstatus_addr = ctl_addr;
            ap->ioaddr.ctl_addr = ctl_addr;
      }

      ata_std_ports(&ap->ioaddr);

      ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
                  (unsigned long long)pnp_port_start(idev, 0),
                  (unsigned long long)pnp_port_start(idev, 1));

      /* activate */
      return ata_host_activate(host, irq, handler, 0,
                         &isapnp_sht);
}

/**
 *    isapnp_remove_one -     unplug an isapnp interface
 *    @idev: PnP device
 *
 *    Remove a previously configured PnP ATA port. Called only on module
 *    unload events as the core does not currently deal with ISAPnP docking.
 */

static void isapnp_remove_one(struct pnp_dev *idev)
{
      struct device *dev = &idev->dev;
      struct ata_host *host = dev_get_drvdata(dev);

      ata_host_detach(host);
}

static struct pnp_device_id isapnp_devices[] = {
      /* Generic ESDI/IDE/ATA compatible hard disk controller */
      {.id = "PNP0600", .driver_data = 0},
      {.id = ""}
};

MODULE_DEVICE_TABLE(pnp, isapnp_devices);

static struct pnp_driver isapnp_driver = {
      .name       = DRV_NAME,
      .id_table   = isapnp_devices,
      .probe            = isapnp_init_one,
      .remove           = isapnp_remove_one,
};

static int __init isapnp_init(void)
{
      return pnp_register_driver(&isapnp_driver);
}

static void __exit isapnp_exit(void)
{
      pnp_unregister_driver(&isapnp_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ISA PnP ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_init(isapnp_init);
module_exit(isapnp_exit);

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