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path: root/drivers/mmc/host/sdhci-spear.c
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Diffstat (limited to 'drivers/mmc/host/sdhci-spear.c')
-rw-r--r--drivers/mmc/host/sdhci-spear.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-spear.c b/drivers/mmc/host/sdhci-spear.c
new file mode 100644
index 000000000..c79035727
--- /dev/null
+++ b/drivers/mmc/host/sdhci-spear.c
@@ -0,0 +1,196 @@
+/*
+ * drivers/mmc/host/sdhci-spear.c
+ *
+ * Support of SDHCI platform devices for spear soc family
+ *
+ * Copyright (C) 2010 ST Microelectronics
+ * Viresh Kumar <vireshk@kernel.org>
+ *
+ * Inspired by sdhci-pltfm.c
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/io.h>
+#include "sdhci.h"
+
+struct spear_sdhci {
+ struct clk *clk;
+};
+
+/* sdhci ops */
+static const struct sdhci_ops sdhci_pltfm_ops = {
+ .set_clock = sdhci_set_clock,
+ .set_bus_width = sdhci_set_bus_width,
+ .reset = sdhci_reset,
+ .set_uhs_signaling = sdhci_set_uhs_signaling,
+};
+
+static int sdhci_probe(struct platform_device *pdev)
+{
+ struct sdhci_host *host;
+ struct spear_sdhci *sdhci;
+ struct device *dev;
+ int ret;
+
+ dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
+ host = sdhci_alloc_host(dev, sizeof(*sdhci));
+ if (IS_ERR(host)) {
+ ret = PTR_ERR(host);
+ dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
+ goto err;
+ }
+
+ host->ioaddr = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(host->ioaddr)) {
+ ret = PTR_ERR(host->ioaddr);
+ dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
+ goto err_host;
+ }
+
+ host->hw_name = "sdhci";
+ host->ops = &sdhci_pltfm_ops;
+ host->irq = platform_get_irq(pdev, 0);
+ if (host->irq < 0) {
+ ret = host->irq;
+ goto err_host;
+ }
+ host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
+
+ sdhci = sdhci_priv(host);
+
+ /* clk enable */
+ sdhci->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(sdhci->clk)) {
+ ret = PTR_ERR(sdhci->clk);
+ dev_dbg(&pdev->dev, "Error getting clock\n");
+ goto err_host;
+ }
+
+ ret = clk_prepare_enable(sdhci->clk);
+ if (ret) {
+ dev_dbg(&pdev->dev, "Error enabling clock\n");
+ goto err_host;
+ }
+
+ ret = clk_set_rate(sdhci->clk, 50000000);
+ if (ret)
+ dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
+ clk_get_rate(sdhci->clk));
+
+ /*
+ * It is optional to use GPIOs for sdhci card detection. If we
+ * find a descriptor using slot GPIO, we use it.
+ */
+ ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0);
+ if (ret == -EPROBE_DEFER)
+ goto disable_clk;
+
+ ret = sdhci_add_host(host);
+ if (ret)
+ goto disable_clk;
+
+ platform_set_drvdata(pdev, host);
+
+ return 0;
+
+disable_clk:
+ clk_disable_unprepare(sdhci->clk);
+err_host:
+ sdhci_free_host(host);
+err:
+ dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
+ return ret;
+}
+
+static int sdhci_remove(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct spear_sdhci *sdhci = sdhci_priv(host);
+ int dead = 0;
+ u32 scratch;
+
+ scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
+ if (scratch == (u32)-1)
+ dead = 1;
+
+ sdhci_remove_host(host, dead);
+ clk_disable_unprepare(sdhci->clk);
+ sdhci_free_host(host);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int sdhci_suspend(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ struct spear_sdhci *sdhci = sdhci_priv(host);
+ int ret;
+
+ if (host->tuning_mode != SDHCI_TUNING_MODE_3)
+ mmc_retune_needed(host->mmc);
+
+ ret = sdhci_suspend_host(host);
+ if (!ret)
+ clk_disable(sdhci->clk);
+
+ return ret;
+}
+
+static int sdhci_resume(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ struct spear_sdhci *sdhci = sdhci_priv(host);
+ int ret;
+
+ ret = clk_enable(sdhci->clk);
+ if (ret) {
+ dev_dbg(dev, "Resume: Error enabling clock\n");
+ return ret;
+ }
+
+ return sdhci_resume_host(host);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sdhci_spear_id_table[] = {
+ { .compatible = "st,spear300-sdhci" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
+#endif
+
+static struct platform_driver sdhci_driver = {
+ .driver = {
+ .name = "sdhci",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .pm = &sdhci_pm_ops,
+ .of_match_table = of_match_ptr(sdhci_spear_id_table),
+ },
+ .probe = sdhci_probe,
+ .remove = sdhci_remove,
+};
+
+module_platform_driver(sdhci_driver);
+
+MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
+MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");
+MODULE_LICENSE("GPL v2");