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pata_platform.c

/*
 * Generic platform device PATA driver
 *
 * Copyright (C) 2006 - 2007  Paul Mundt
 *
 * Based on pata_pcmcia:
 *
 *   Copyright 2005-2006 Red Hat Inc <alan@redhat.com>, all rights reserved.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <linux/pata_platform.h>

#define DRV_NAME "pata_platform"
#define DRV_VERSION "1.2"

static int pio_mask = 1;

/*
 * Provide our own set_mode() as we don't want to change anything that has
 * already been configured..
 */
static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
{
      struct ata_device *dev;

      ata_link_for_each_dev(dev, link) {
            if (ata_dev_enabled(dev)) {
                  /* We don't really care */
                  dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
                  dev->xfer_shift = ATA_SHIFT_PIO;
                  dev->flags |= ATA_DFLAG_PIO;
                  ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
            }
      }
      return 0;
}

static int ata_dummy_ret0(struct ata_port *ap)  { return 0; }

static struct scsi_host_template pata_platform_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 pata_platform_port_ops = {
      .set_mode         = pata_platform_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,

      .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,

      .data_xfer        = ata_data_xfer_noirq,

      .irq_clear        = ata_bmdma_irq_clear,
      .irq_on                 = ata_irq_on,

      .port_start       = ata_dummy_ret0,
};

static void pata_platform_setup_port(struct ata_ioports *ioaddr,
                             struct pata_platform_info *info)
{
      unsigned int shift = 0;

      /* Fixup the port shift for platforms that need it */
      if (info && info->ioport_shift)
            shift = info->ioport_shift;

      ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA    << shift);
      ioaddr->error_addr      = ioaddr->cmd_addr + (ATA_REG_ERR     << shift);
      ioaddr->feature_addr    = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
      ioaddr->nsect_addr      = ioaddr->cmd_addr + (ATA_REG_NSECT   << shift);
      ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL    << shift);
      ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM    << shift);
      ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH    << shift);
      ioaddr->device_addr     = ioaddr->cmd_addr + (ATA_REG_DEVICE  << shift);
      ioaddr->status_addr     = ioaddr->cmd_addr + (ATA_REG_STATUS  << shift);
      ioaddr->command_addr    = ioaddr->cmd_addr + (ATA_REG_CMD     << shift);
}

/**
 *    pata_platform_probe           -     attach a platform interface
 *    @pdev: platform device
 *
 *    Register a platform bus IDE interface. Such interfaces are PIO and we
 *    assume do not support IRQ sharing.
 *
 *    Platform devices are expected to contain at least 2 resources per port:
 *
 *          - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
 *          - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
 *
 *    and optionally:
 *
 *          - IRQ    (IORESOURCE_IRQ)
 *
 *    If the base resources are both mem types, the ioremap() is handled
 *    here. For IORESOURCE_IO, it's assumed that there's no remapping
 *    necessary.
 *
 *    If no IRQ resource is present, PIO polling mode is used instead.
 */
static int __devinit pata_platform_probe(struct platform_device *pdev)
{
      struct resource *io_res, *ctl_res;
      struct ata_host *host;
      struct ata_port *ap;
      struct pata_platform_info *pp_info;
      unsigned int mmio;
      int irq;

      /*
       * Simple resource validation ..
       */
      if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
            dev_err(&pdev->dev, "invalid number of resources\n");
            return -EINVAL;
      }

      /*
       * Get the I/O base first
       */
      io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
      if (io_res == NULL) {
            io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
            if (unlikely(io_res == NULL))
                  return -EINVAL;
      }

      /*
       * Then the CTL base
       */
      ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
      if (ctl_res == NULL) {
            ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
            if (unlikely(ctl_res == NULL))
                  return -EINVAL;
      }

      /*
       * Check for MMIO
       */
      mmio = (( io_res->flags == IORESOURCE_MEM) &&
            (ctl_res->flags == IORESOURCE_MEM));

      /*
       * And the IRQ
       */
      irq = platform_get_irq(pdev, 0);
      if (irq < 0)
            irq = 0;    /* no irq */

      /*
       * Now that that's out of the way, wire up the port..
       */
      host = ata_host_alloc(&pdev->dev, 1);
      if (!host)
            return -ENOMEM;
      ap = host->ports[0];

      ap->ops = &pata_platform_port_ops;
      ap->pio_mask = pio_mask;
      ap->flags |= ATA_FLAG_SLAVE_POSS;

      /*
       * Use polling mode if there's no IRQ
       */
      if (!irq) {
            ap->flags |= ATA_FLAG_PIO_POLLING;
            ata_port_desc(ap, "no IRQ, using PIO polling");
      }

      /*
       * Handle the MMIO case
       */
      if (mmio) {
            ap->ioaddr.cmd_addr = devm_ioremap(&pdev->dev, io_res->start,
                        io_res->end - io_res->start + 1);
            ap->ioaddr.ctl_addr = devm_ioremap(&pdev->dev, ctl_res->start,
                        ctl_res->end - ctl_res->start + 1);
      } else {
            ap->ioaddr.cmd_addr = devm_ioport_map(&pdev->dev, io_res->start,
                        io_res->end - io_res->start + 1);
            ap->ioaddr.ctl_addr = devm_ioport_map(&pdev->dev, ctl_res->start,
                        ctl_res->end - ctl_res->start + 1);
      }
      if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
            dev_err(&pdev->dev, "failed to map IO/CTL base\n");
            return -ENOMEM;
      }

      ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;

      pp_info = pdev->dev.platform_data;
      pata_platform_setup_port(&ap->ioaddr, pp_info);

      ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
                  (unsigned long long)io_res->start,
                  (unsigned long long)ctl_res->start);

      /* activate */
      return ata_host_activate(host, irq, irq ? ata_interrupt : NULL,
                         pp_info ? pp_info->irq_flags : 0,
                         &pata_platform_sht);
}

/**
 *    pata_platform_remove    -     unplug a platform interface
 *    @pdev: platform device
 *
 *    A platform bus ATA device has been unplugged. Perform the needed
 *    cleanup. Also called on module unload for any active devices.
 */
static int __devexit pata_platform_remove(struct platform_device *pdev)
{
      struct device *dev = &pdev->dev;
      struct ata_host *host = dev_get_drvdata(dev);

      ata_host_detach(host);

      return 0;
}

static struct platform_driver pata_platform_driver = {
      .probe            = pata_platform_probe,
      .remove           = __devexit_p(pata_platform_remove),
      .driver = {
            .name       = DRV_NAME,
            .owner            = THIS_MODULE,
      },
};

static int __init pata_platform_init(void)
{
      return platform_driver_register(&pata_platform_driver);
}

static void __exit pata_platform_exit(void)
{
      platform_driver_unregister(&pata_platform_driver);
}
module_init(pata_platform_init);
module_exit(pata_platform_exit);

module_param(pio_mask, int, 0);

MODULE_AUTHOR("Paul Mundt");
MODULE_DESCRIPTION("low-level driver for platform device ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

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