169 строки
4.6 KiB
C
169 строки
4.6 KiB
C
/*
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* sdhci-pltfm.c Support for SDHCI platform devices
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* Copyright (c) 2009 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* Supports:
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* SDHCI platform devices
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*
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* Inspired by sdhci-pci.c, by Pierre Ossman
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*/
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#include <linux/delay.h>
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#include <linux/highmem.h>
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#include <linux/platform_device.h>
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#include <linux/mmc/host.h>
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#include <linux/io.h>
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#include "sdhci.h"
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/*****************************************************************************\
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* *
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* SDHCI core callbacks *
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* *
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\*****************************************************************************/
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static struct sdhci_ops sdhci_pltfm_ops = {
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};
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/*****************************************************************************\
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* *
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* Device probing/removal *
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* *
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\*****************************************************************************/
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static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
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{
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struct sdhci_host *host;
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struct resource *iomem;
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int ret;
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BUG_ON(pdev == NULL);
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!iomem) {
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ret = -ENOMEM;
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goto err;
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}
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if (resource_size(iomem) != 0x100)
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dev_err(&pdev->dev, "Invalid iomem size. You may "
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"experience problems.\n");
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if (pdev->dev.parent)
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host = sdhci_alloc_host(pdev->dev.parent, 0);
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else
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host = sdhci_alloc_host(&pdev->dev, 0);
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if (IS_ERR(host)) {
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ret = PTR_ERR(host);
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goto err;
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}
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host->hw_name = "platform";
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host->ops = &sdhci_pltfm_ops;
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host->irq = platform_get_irq(pdev, 0);
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if (!request_mem_region(iomem->start, resource_size(iomem),
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mmc_hostname(host->mmc))) {
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dev_err(&pdev->dev, "cannot request region\n");
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ret = -EBUSY;
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goto err_request;
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}
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host->ioaddr = ioremap(iomem->start, resource_size(iomem));
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if (!host->ioaddr) {
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dev_err(&pdev->dev, "failed to remap registers\n");
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ret = -ENOMEM;
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goto err_remap;
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}
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ret = sdhci_add_host(host);
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if (ret)
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goto err_add_host;
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platform_set_drvdata(pdev, host);
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return 0;
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err_add_host:
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iounmap(host->ioaddr);
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err_remap:
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release_mem_region(iomem->start, resource_size(iomem));
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err_request:
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sdhci_free_host(host);
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err:
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printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
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return ret;
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}
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static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
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{
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struct sdhci_host *host = platform_get_drvdata(pdev);
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struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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int dead;
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u32 scratch;
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dead = 0;
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scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
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if (scratch == (u32)-1)
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dead = 1;
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sdhci_remove_host(host, dead);
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iounmap(host->ioaddr);
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release_mem_region(iomem->start, resource_size(iomem));
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sdhci_free_host(host);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver sdhci_pltfm_driver = {
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.driver = {
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.name = "sdhci",
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.owner = THIS_MODULE,
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},
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.probe = sdhci_pltfm_probe,
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.remove = __devexit_p(sdhci_pltfm_remove),
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};
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/*****************************************************************************\
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* *
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* Driver init/exit *
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* *
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\*****************************************************************************/
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static int __init sdhci_drv_init(void)
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{
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return platform_driver_register(&sdhci_pltfm_driver);
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}
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static void __exit sdhci_drv_exit(void)
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{
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platform_driver_unregister(&sdhci_pltfm_driver);
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}
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module_init(sdhci_drv_init);
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module_exit(sdhci_drv_exit);
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MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
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MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:sdhci");
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