This patch implements the driver for the platfrom SDHCI controllers that found
on some of Marvell's SoC's.
Signed-off-by: Saeed Bishara <sa...@marvell.com>
---
drivers/mmc/host/sdhci-mv.c | 266 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 266 insertions(+), 0 deletions(-)
create mode 100644 drivers/mmc/host/sdhci-mv.c
diff --git a/drivers/mmc/host/sdhci-mv.c b/drivers/mmc/host/sdhci-mv.c
new file mode 100644
index 0000000..a88cae1
--- /dev/null
+++ b/drivers/mmc/host/sdhci-mv.c
@@ -0,0 +1,266 @@
+/*
+ * sdhci-mv.c Support for SDHCI platform devices
+ *
+ * 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 found on Marvell SoC's
+ *
+ * Based on sdhci-pltfm.c
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/mmc/host.h>
+#include "sdhci.h"
+
+struct sdhci_mv_host {
+#if defined(CONFIG_HAVE_CLK)
+ struct clk *clk;
+#endif
+};
+
+/*****************************************************************************\
+ * *
+ * SDHCI core callbacks *
+ * *
+\*****************************************************************************/
+static u16 mv_readw(struct sdhci_host *host, int reg)
+{
+ u16 ret;
+
+ switch (reg) {
+ case SDHCI_HOST_VERSION:
+ case SDHCI_SLOT_INT_STATUS:
+ /* those registers don't exist */
+ return 0;
+ default:
+ ret = readw(host->ioaddr + reg);
+ }
+ return ret;
+}
+
+static u32 mv_readl(struct sdhci_host *host, int reg)
+{
+ u32 ret;
+
+ switch (reg) {
+ case SDHCI_BUFFER:
+ /*
+ * This register can't be accessed with 32 bit access, solve
+ * this issue by breaking it into two 16 bit accesses.
+ */
+ ret = readw(host->ioaddr + SDHCI_BUFFER);
+ ret |= readw(host->ioaddr + SDHCI_BUFFER + 2) << 16;
+ break;
+ default:
+ ret = readl(host->ioaddr + reg);
+ }
+ return ret;
+}
+
+static void mv_writel(struct sdhci_host *host, u32 val, int reg)
+{
+ switch (reg) {
+ case SDHCI_BUFFER:
+ {
+ /*
+ * This register can't be accessed with 32 bit access, solve
+ * this issue by breaking it into two 16 bit accesses.
+ */
+ u16 temp = reg & 0xFFFF;
+ writew(temp, host->ioaddr + SDHCI_BUFFER);
+ temp = (0xFFFF0000 & reg) >> 16;
+ writew(temp, host->ioaddr + SDHCI_BUFFER + 2);
+ }
+ break;
+ default:
+ writel(val, host->ioaddr + reg);
+ }
+}
+
+static struct sdhci_ops sdhci_mv_ops = {
+ .read_w = mv_readw,
+ .read_l = mv_readl,
+ .write_l = mv_writel,
+};
+
+/*****************************************************************************\
+ * *
+ * Device probing/removal *
+ * *
+\*****************************************************************************/
+
+static int __devinit sdhci_mv_probe(struct platform_device *pdev)
+{
+ struct sdhci_host *host;
+ struct sdhci_mv_host *mv_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, sizeof(*mv_host));
+ else
+ host = sdhci_alloc_host(&pdev->dev, sizeof(*mv_host));
+
+ if (IS_ERR(host)) {
+ ret = PTR_ERR(host);
+ goto err;
+ }
+
+ mv_host = sdhci_priv(host);
+ host->hw_name = "marvell-sdhci";
+ host->ops = &sdhci_mv_ops;
+ host->irq = platform_get_irq(pdev, 0);
+ host->quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
+ SDHCI_QUIRK_NO_BUSY_IRQ |
+ SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
+
+ if (!devm_request_mem_region(&pdev->dev, iomem->start,
+ resource_size(iomem),
+ mmc_hostname(host->mmc))) {
+ dev_err(&pdev->dev, "cannot request region\n");
+ ret = -EBUSY;
+ goto err_request;
+ }
+
+ host->ioaddr = devm_ioremap(&pdev->dev, iomem->start,
+ resource_size(iomem));
+ if (!host->ioaddr) {
+ dev_err(&pdev->dev, "failed to remap registers\n");
+ ret = -ENOMEM;
+ goto err_request;
+ }
+
+#if defined(CONFIG_HAVE_CLK)
+ mv_host->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(mv_host->clk))
+ dev_notice(&pdev->dev, "cannot get clkdev\n");
+ else
+ clk_enable(mv_host->clk);
+#endif
+
+ ret = sdhci_add_host(host);
+ if (ret)
+ goto err_request;
+
+ platform_set_drvdata(pdev, host);
+
+ return 0;
+
+err_request:
+ sdhci_free_host(host);
+err:
+ printk(KERN_ERR"Probing of sdhci-mv failed: %d\n", ret);
+ return ret;
+}
+
+static int __devexit sdhci_mv_remove(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+#if defined(CONFIG_HAVE_CLK)
+ struct sdhci_mv_host *mv_host = sdhci_priv(host);
+ struct clk *clk = mv_host->clk;
+#endif
+ int dead;
+ u32 scratch;
+
+ dead = 0;
+ scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
+ if (scratch == (u32)-1)
+ dead = 1;
+
+ sdhci_remove_host(host, dead);
+ sdhci_free_host(host);
+ platform_set_drvdata(pdev, NULL);
+#if defined(CONFIG_HAVE_CLK)
+ if (!IS_ERR(clk)) {
+ clk_disable(clk);
+ clk_put(clk);
+ }
+#endif
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int sdhci_mv_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct sdhci_host *host = dev_get_drvdata(&pdev->dev);
+
+ return sdhci_suspend_host(host, state);
+}
+
+static int sdhci_mv_resume(struct platform_device *pdev)
+{
+ struct sdhci_host *host = dev_get_drvdata(&pdev->dev);
+
+ return sdhci_resume_host(host);
+}
+#else
+#define sdhci_mv_suspend NULL
+#define sdhci_mv_resume NULL
+#endif
+
+static struct platform_driver sdhci_mv_driver = {
+ .driver = {
+ .name = "sdhci-mv",
+ .owner = THIS_MODULE,
+ },
+ .probe = sdhci_mv_probe,
+ .remove = __devexit_p(sdhci_mv_remove),
+ .suspend = sdhci_mv_suspend,
+ .resume = sdhci_mv_resume,
+};
+
+/*****************************************************************************\
+ * *
+ * Driver init/exit *
+ * *
+\*****************************************************************************/
+
+static int __init sdhci_mv_init(void)
+{
+ return platform_driver_register(&sdhci_mv_driver);
+}
+
+static void __exit sdhci_mv_exit(void)
+{
+ platform_driver_unregister(&sdhci_mv_driver);
+}
+
+module_init(sdhci_mv_init);
+module_exit(sdhci_mv_exit);
+
+MODULE_DESCRIPTION("Marvell SDHCI platform driver");
+MODULE_AUTHOR("Saeed Bishara <sa...@marvell.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sdhci-mv");
+
--
1.6.0.4
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