spi-dw-pci.c

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/*
 * PCI interface driver for DW SPI Core
 *
 * Copyright (c) 2009, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/module.h>

#include "spi-dw.h"

#define DRIVER_NAME "dw_spi_pci"

struct dw_spi_pci {
    struct pci_dev  *pdev;
    struct dw_spi   dws;
};

static int __devinit spi_pci_probe(struct pci_dev *pdev,
    const struct pci_device_id *ent)
{
    struct dw_spi_pci *dwpci;
    struct dw_spi *dws;
    int pci_bar = 0;
    int ret;

    printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n",
        pdev->vendor, pdev->device);

    ret = pci_enable_device(pdev);
    if (ret)
        return ret;

    dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL);
    if (!dwpci) {
        ret = -ENOMEM;
        goto err_disable;
    }

    dwpci->pdev = pdev;
    dws = &dwpci->dws;

    /* Get basic io resource and map it */
    dws->paddr = pci_resource_start(pdev, pci_bar);
    dws->iolen = pci_resource_len(pdev, pci_bar);

    ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev));
    if (ret)
        goto err_kfree;

    dws->regs = ioremap_nocache((unsigned long)dws->paddr,
                pci_resource_len(pdev, pci_bar));
    if (!dws->regs) {
        ret = -ENOMEM;
        goto err_release_reg;
    }

    dws->parent_dev = &pdev->dev;
    dws->bus_num = 0;
    dws->num_cs = 4;
    dws->irq = pdev->irq;

    /*
     * Specific handling for Intel MID paltforms, like dma setup,
     * clock rate, FIFO depth.
     */
    if (pdev->device == 0x0800) {
        ret = dw_spi_mid_init(dws);
        if (ret)
            goto err_unmap;
    }

    ret = dw_spi_add_host(dws);
    if (ret)
        goto err_unmap;

    /* PCI hook and SPI hook use the same drv data */
    pci_set_drvdata(pdev, dwpci);
    return 0;

err_unmap:
    iounmap(dws->regs);
err_release_reg:
    pci_release_region(pdev, pci_bar);
err_kfree:
    kfree(dwpci);
err_disable:
    pci_disable_device(pdev);
    return ret;
}

static void __devexit spi_pci_remove(struct pci_dev *pdev)
{
    struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);

    pci_set_drvdata(pdev, NULL);
    dw_spi_remove_host(&dwpci->dws);
    iounmap(dwpci->dws.regs);
    pci_release_region(pdev, 0);
    kfree(dwpci);
    pci_disable_device(pdev);
}

#ifdef CONFIG_PM
static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
{
    struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
    int ret;

    ret = dw_spi_suspend_host(&dwpci->dws);
    if (ret)
        return ret;
    pci_save_state(pdev);
    pci_disable_device(pdev);
    pci_set_power_state(pdev, pci_choose_state(pdev, state));
    return ret;
}

static int spi_resume(struct pci_dev *pdev)
{
    struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
    int ret;

    pci_set_power_state(pdev, PCI_D0);
    pci_restore_state(pdev);
    ret = pci_enable_device(pdev);
    if (ret)
        return ret;
    return dw_spi_resume_host(&dwpci->dws);
}
#else
#define spi_suspend NULL
#define spi_resume  NULL
#endif

static DEFINE_PCI_DEVICE_TABLE(pci_ids) = {
    /* Intel MID platform SPI controller 0 */
    { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
    {},
};

static struct pci_driver dw_spi_driver = {
    .name =     DRIVER_NAME,
    .id_table = pci_ids,
    .probe =    spi_pci_probe,
    .remove =   __devexit_p(spi_pci_remove),
    .suspend =  spi_suspend,
    .resume =   spi_resume,
};

module_pci_driver(dw_spi_driver);

MODULE_AUTHOR("Feng Tang <[email protected]>");
MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
MODULE_LICENSE("GPL v2");