aboutsummaryrefslogtreecommitdiff
path: root/drivers/mmc/host/sdhci-pltfm.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mmc/host/sdhci-pltfm.c')
-rw-r--r--drivers/mmc/host/sdhci-pltfm.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
new file mode 100644
index 00000000000..297f40ae6ad
--- /dev/null
+++ b/drivers/mmc/host/sdhci-pltfm.c
@@ -0,0 +1,168 @@
+/*
+ * sdhci-pltfm.c Support for SDHCI platform devices
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * SDHCI platform devices
+ *
+ * Inspired by sdhci-pci.c, by Pierre Ossman
+ */
+
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/platform_device.h>
+
+#include <linux/mmc/host.h>
+
+#include <linux/io.h>
+
+#include "sdhci.h"
+
+/*****************************************************************************\
+ * *
+ * SDHCI core callbacks *
+ * *
+\*****************************************************************************/
+
+static struct sdhci_ops sdhci_pltfm_ops = {
+};
+
+/*****************************************************************************\
+ * *
+ * Device probing/removal *
+ * *
+\*****************************************************************************/
+
+static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
+{
+ struct sdhci_host *host;
+ struct resource *iomem;
+ int ret;
+
+ BUG_ON(pdev == NULL);
+
+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!iomem) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ if (resource_size(iomem) != 0x100)
+ dev_err(&pdev->dev, "Invalid iomem size. You may "
+ "experience problems.\n");
+
+ if (pdev->dev.parent)
+ host = sdhci_alloc_host(pdev->dev.parent, 0);
+ else
+ host = sdhci_alloc_host(&pdev->dev, 0);
+
+ if (IS_ERR(host)) {
+ ret = PTR_ERR(host);
+ goto err;
+ }
+
+ host->hw_name = "platform";
+ host->ops = &sdhci_pltfm_ops;
+ host->irq = platform_get_irq(pdev, 0);
+
+ if (!request_mem_region(iomem->start, resource_size(iomem),
+ mmc_hostname(host->mmc))) {
+ dev_err(&pdev->dev, "cannot request region\n");
+ ret = -EBUSY;
+ goto err_request;
+ }
+
+ host->ioaddr = ioremap(iomem->start, resource_size(iomem));
+ if (!host->ioaddr) {
+ dev_err(&pdev->dev, "failed to remap registers\n");
+ ret = -ENOMEM;
+ goto err_remap;
+ }
+
+ ret = sdhci_add_host(host);
+ if (ret)
+ goto err_add_host;
+
+ platform_set_drvdata(pdev, host);
+
+ return 0;
+
+err_add_host:
+ iounmap(host->ioaddr);
+err_remap:
+ release_mem_region(iomem->start, resource_size(iomem));
+err_request:
+ sdhci_free_host(host);
+err:
+ printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
+ return ret;
+}
+
+static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ int dead;
+ u32 scratch;
+
+ dead = 0;
+ scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
+ if (scratch == (u32)-1)
+ dead = 1;
+
+ sdhci_remove_host(host, dead);
+ iounmap(host->ioaddr);
+ release_mem_region(iomem->start, resource_size(iomem));
+ sdhci_free_host(host);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver sdhci_pltfm_driver = {
+ .driver = {
+ .name = "sdhci",
+ .owner = THIS_MODULE,
+ },
+ .probe = sdhci_pltfm_probe,
+ .remove = __devexit_p(sdhci_pltfm_remove),
+};
+
+/*****************************************************************************\
+ * *
+ * Driver init/exit *
+ * *
+\*****************************************************************************/
+
+static int __init sdhci_drv_init(void)
+{
+ return platform_driver_register(&sdhci_pltfm_driver);
+}
+
+static void __exit sdhci_drv_exit(void)
+{
+ platform_driver_unregister(&sdhci_pltfm_driver);
+}
+
+module_init(sdhci_drv_init);
+module_exit(sdhci_drv_exit);
+
+MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
+MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sdhci");
+