--- /dev/null
+/* linux/drivers/mmc/host/sdhci-pxa.c
+ *
+ * Copyright (C) 2010 Marvell International Ltd.
+ * Zhangfei Gao <zhangfei.gao@marvell.com>
+ * Kevin Wang <dwang4@marvell.com>
+ * Mingwei Wang <mwwang@marvell.com>
+ * Philip Rakity <prakity@marvell.com>
+ * Mark Brown <markb@marvell.com>
+ *
+ * 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.
+ */
+
+/* Supports:
+ * SDHCI support for MMP2/PXA910/PXA168
+ *
+ * Refer to sdhci-s3c.c.
+ */
+
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/mmc/host.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <plat/sdhci.h>
+#include "sdhci.h"
+
+#define DRIVER_NAME "sdhci-pxa"
+
+#define SD_FIFO_PARAM 0x104
+#define DIS_PAD_SD_CLK_GATE 0x400
+
+struct sdhci_pxa {
+ struct sdhci_host *host;
+ struct sdhci_pxa_platdata *pdata;
+ struct clk *clk;
+ struct resource *res;
+
+ u8 clk_enable;
+};
+
+/*****************************************************************************\
+ * *
+ * SDHCI core callbacks *
+ * *
+\*****************************************************************************/
+static void set_clock(struct sdhci_host *host, unsigned int clock)
+{
+ struct sdhci_pxa *pxa = sdhci_priv(host);
+ u32 tmp = 0;
+
+ if (clock == 0) {
+ if (pxa->clk_enable) {
+ clk_disable(pxa->clk);
+ pxa->clk_enable = 0;
+ }
+ } else {
+ if (0 == pxa->clk_enable) {
+ if (pxa->pdata->flags & PXA_FLAG_DISABLE_CLOCK_GATING) {
+ tmp = readl(host->ioaddr + SD_FIFO_PARAM);
+ tmp |= DIS_PAD_SD_CLK_GATE;
+ writel(tmp, host->ioaddr + SD_FIFO_PARAM);
+ }
+ clk_enable(pxa->clk);
+ pxa->clk_enable = 1;
+ }
+ }
+}
+
+static struct sdhci_ops sdhci_pxa_ops = {
+ .set_clock = set_clock,
+};
+
+/*****************************************************************************\
+ * *
+ * Device probing/removal *
+ * *
+\*****************************************************************************/
+
+static int __devinit sdhci_pxa_probe(struct platform_device *pdev)
+{
+ struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
+ struct device *dev = &pdev->dev;
+ struct sdhci_host *host = NULL;
+ struct resource *iomem = NULL;
+ struct sdhci_pxa *pxa = NULL;
+ int ret, irq;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "no irq specified\n");
+ return irq;
+ }
+
+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!iomem) {
+ dev_err(dev, "no memory specified\n");
+ return -ENOENT;
+ }
+
+ host = sdhci_alloc_host(&pdev->dev, sizeof(struct sdhci_pxa));
+ if (IS_ERR(host)) {
+ dev_err(dev, "failed to alloc host\n");
+ return PTR_ERR(host);
+ }
+
+ pxa = sdhci_priv(host);
+ pxa->host = host;
+ pxa->pdata = pdata;
+ pxa->clk_enable = 0;
+
+ pxa->clk = clk_get(dev, "PXA-SDHCLK");
+ if (IS_ERR(pxa->clk)) {
+ dev_err(dev, "failed to get io clock\n");
+ ret = PTR_ERR(pxa->clk);
+ goto out;
+ }
+
+ pxa->res = request_mem_region(iomem->start, resource_size(iomem),
+ mmc_hostname(host->mmc));
+ if (!pxa->res) {
+ dev_err(&pdev->dev, "cannot request region\n");
+ ret = -EBUSY;
+ goto out;
+ }
+
+ host->ioaddr = ioremap(iomem->start, resource_size(iomem));
+ if (!host->ioaddr) {
+ dev_err(&pdev->dev, "failed to remap registers\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ host->hw_name = "MMC";
+ host->ops = &sdhci_pxa_ops;
+ host->irq = irq;
+ host->quirks = SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
+
+ if (pdata->quirks)
+ host->quirks |= pdata->quirks;
+
+ ret = sdhci_add_host(host);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add host\n");
+ goto out;
+ }
+
+ if (pxa->pdata->max_speed)
+ host->mmc->f_max = pxa->pdata->max_speed;
+
+ platform_set_drvdata(pdev, host);
+
+ return 0;
+out:
+ if (host) {
+ clk_put(pxa->clk);
+ if (host->ioaddr)
+ iounmap(host->ioaddr);
+ if (pxa->res)
+ release_mem_region(pxa->res->start,
+ resource_size(pxa->res));
+ sdhci_free_host(host);
+ }
+
+ return ret;
+}
+
+static int __devexit sdhci_pxa_remove(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct sdhci_pxa *pxa = sdhci_priv(host);
+ int dead = 0;
+ u32 scratch;
+
+ if (host) {
+ scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
+ if (scratch == (u32)-1)
+ dead = 1;
+
+ sdhci_remove_host(host, dead);
+
+ if (host->ioaddr)
+ iounmap(host->ioaddr);
+ if (pxa->res)
+ release_mem_region(pxa->res->start,
+ resource_size(pxa->res));
+ if (pxa->clk_enable) {
+ clk_disable(pxa->clk);
+ pxa->clk_enable = 0;
+ }
+ clk_put(pxa->clk);
+
+ sdhci_free_host(host);
+ platform_set_drvdata(pdev, NULL);
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int sdhci_pxa_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct sdhci_host *host = platform_get_drvdata(dev);
+
+ return sdhci_suspend_host(host, state);
+}
+
+static int sdhci_pxa_resume(struct platform_device *dev)
+{
+ struct sdhci_host *host = platform_get_drvdata(dev);
+
+ return sdhci_resume_host(host);
+}
+#else
+#define sdhci_pxa_suspend NULL
+#define sdhci_pxa_resume NULL
+#endif
+
+static struct platform_driver sdhci_pxa_driver = {
+ .probe = sdhci_pxa_probe,
+ .remove = __devexit_p(sdhci_pxa_remove),
+ .suspend = sdhci_pxa_suspend,
+ .resume = sdhci_pxa_resume,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+/*****************************************************************************\
+ * *
+ * Driver init/exit *
+ * *
+\*****************************************************************************/
+
+static int __init sdhci_pxa_init(void)
+{
+ return platform_driver_register(&sdhci_pxa_driver);
+}
+
+static void __exit sdhci_pxa_exit(void)
+{
+ platform_driver_unregister(&sdhci_pxa_driver);
+}
+
+module_init(sdhci_pxa_init);
+module_exit(sdhci_pxa_exit);
+
+MODULE_DESCRIPTION("SDH controller driver for PXA168/PXA910/MMP2");
+MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
+MODULE_LICENSE("GPL v2");
projects / karo-tx-linux.git / commitdiff