Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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);