pata_platform.c

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/*
 * Generic platform device PATA driver
 *
 * Copyright (C) 2006 - 2007  Paul Mundt
 *
 * Based on pata_pcmcia:
 *
 *   Copyright 2005-2006 Red Hat Inc, 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/ata_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_for_each_dev(dev, link, ENABLED) {
        /* 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_info(dev, "configured for PIO\n");
    }
    return 0;
}

static struct scsi_host_template pata_platform_sht = {
    ATA_PIO_SHT(DRV_NAME),
};

static struct ata_port_operations pata_platform_port_ops = {
    .inherits       = &ata_sff_port_ops,
    .sff_data_xfer      = ata_sff_data_xfer_noirq,
    .cable_detect       = ata_cable_unknown,
    .set_mode       = pata_platform_set_mode,
};

static void pata_platform_setup_port(struct ata_ioports *ioaddr,
                     unsigned int shift)
{
    /* Fixup the port shift for platforms that need it */
    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);
}

int __devinit __pata_platform_probe(struct device *dev,
                    struct resource *io_res,
                    struct resource *ctl_res,
                    struct resource *irq_res,
                    unsigned int ioport_shift,
                    int __pio_mask)
{
    struct ata_host *host;
    struct ata_port *ap;
    unsigned int mmio;
    int irq = 0;
    int irq_flags = 0;

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

    /*
     * And the IRQ
     */
    if (irq_res && irq_res->start > 0) {
        irq = irq_res->start;
        irq_flags = irq_res->flags;
    }

    /*
     * Now that that's out of the way, wire up the port..
     */
    host = ata_host_alloc(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(dev, io_res->start,
                resource_size(io_res));
        ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
                resource_size(ctl_res));
    } else {
        ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
                resource_size(io_res));
        ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
                resource_size(ctl_res));
    }
    if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
        dev_err(dev, "failed to map IO/CTL base\n");
        return -ENOMEM;
    }

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

    pata_platform_setup_port(&ap->ioaddr, ioport_shift);

    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_sff_interrupt : NULL,
                 irq_flags, &pata_platform_sht);
}
EXPORT_SYMBOL_GPL(__pata_platform_probe);

int __pata_platform_remove(struct device *dev)
{
    struct ata_host *host = dev_get_drvdata(dev);

    ata_host_detach(host);

    return 0;
}
EXPORT_SYMBOL_GPL(__pata_platform_remove);

static int __devinit pata_platform_probe(struct platform_device *pdev)
{
    struct resource *io_res;
    struct resource *ctl_res;
    struct resource *irq_res;
    struct pata_platform_info *pp_info = pdev->dev.platform_data;

    /*
     * 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;
    }

    /*
     * And the IRQ
     */
    irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (irq_res)
        irq_res->flags = pp_info ? pp_info->irq_flags : 0;

    return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
                     pp_info ? pp_info->ioport_shift : 0,
                     pio_mask);
}

static int __devexit pata_platform_remove(struct platform_device *pdev)
{
    return __pata_platform_remove(&pdev->dev);
}

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

module_platform_driver(pata_platform_driver);

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);
MODULE_ALIAS("platform:" DRV_NAME);