Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 192 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci-spear.c b/drivers/mmc/host/sdhci-spear.c
new file mode 100644
index 0000000000..c81bdfa97b
--- /dev/null
+++ b/drivers/mmc/host/sdhci-spear.c
@@ -0,0 +1,192 @@
+/*
+ * 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 void 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);
+}
+
+#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);
+
+static const struct of_device_id sdhci_spear_id_table[] = {
+	{ .compatible = "st,spear300-sdhci" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
+
+static struct platform_driver sdhci_driver = {
+	.driver = {
+		.name	= "sdhci",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.pm	= &sdhci_pm_ops,
+		.of_match_table = sdhci_spear_id_table,
+	},
+	.probe		= sdhci_probe,
+	.remove_new	= 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");