Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 164 insertions, 0 deletions

diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
new file mode 100644
index 000000000..ea4d36705
--- /dev/null
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Copyright (C) 2014 Linaro Ltd
+ *
+ * Author: Ulf Hansson <ulf.hansson@linaro.org>
+ *
+ *  Simple MMC power sequence management
+ */
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/property.h>
+
+#include <linux/mmc/host.h>
+
+#include "pwrseq.h"
+
+struct mmc_pwrseq_simple {
+	struct mmc_pwrseq pwrseq;
+	bool clk_enabled;
+	u32 post_power_on_delay_ms;
+	u32 power_off_delay_us;
+	struct clk *ext_clk;
+	struct gpio_descs *reset_gpios;
+};
+
+#define to_pwrseq_simple(p) container_of(p, struct mmc_pwrseq_simple, pwrseq)
+
+static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
+					      int value)
+{
+	struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
+
+	if (!IS_ERR(reset_gpios)) {
+		unsigned long *values;
+		int nvalues = reset_gpios->ndescs;
+
+		values = bitmap_alloc(nvalues, GFP_KERNEL);
+		if (!values)
+			return;
+
+		if (value)
+			bitmap_fill(values, nvalues);
+		else
+			bitmap_zero(values, nvalues);
+
+		gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc,
+					       reset_gpios->info, values);
+
+		kfree(values);
+	}
+}
+
+static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
+{
+	struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq);
+
+	if (!IS_ERR(pwrseq->ext_clk) && !pwrseq->clk_enabled) {
+		clk_prepare_enable(pwrseq->ext_clk);
+		pwrseq->clk_enabled = true;
+	}
+
+	mmc_pwrseq_simple_set_gpios_value(pwrseq, 1);
+}
+
+static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host)
+{
+	struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq);
+
+	mmc_pwrseq_simple_set_gpios_value(pwrseq, 0);
+
+	if (pwrseq->post_power_on_delay_ms)
+		msleep(pwrseq->post_power_on_delay_ms);
+}
+
+static void mmc_pwrseq_simple_power_off(struct mmc_host *host)
+{
+	struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq);
+
+	mmc_pwrseq_simple_set_gpios_value(pwrseq, 1);
+
+	if (pwrseq->power_off_delay_us)
+		usleep_range(pwrseq->power_off_delay_us,
+			2 * pwrseq->power_off_delay_us);
+
+	if (!IS_ERR(pwrseq->ext_clk) && pwrseq->clk_enabled) {
+		clk_disable_unprepare(pwrseq->ext_clk);
+		pwrseq->clk_enabled = false;
+	}
+}
+
+static const struct mmc_pwrseq_ops mmc_pwrseq_simple_ops = {
+	.pre_power_on = mmc_pwrseq_simple_pre_power_on,
+	.post_power_on = mmc_pwrseq_simple_post_power_on,
+	.power_off = mmc_pwrseq_simple_power_off,
+};
+
+static const struct of_device_id mmc_pwrseq_simple_of_match[] = {
+	{ .compatible = "mmc-pwrseq-simple",},
+	{/* sentinel */},
+};
+MODULE_DEVICE_TABLE(of, mmc_pwrseq_simple_of_match);
+
+static int mmc_pwrseq_simple_probe(struct platform_device *pdev)
+{
+	struct mmc_pwrseq_simple *pwrseq;
+	struct device *dev = &pdev->dev;
+
+	pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
+	if (!pwrseq)
+		return -ENOMEM;
+
+	pwrseq->ext_clk = devm_clk_get(dev, "ext_clock");
+	if (IS_ERR(pwrseq->ext_clk) && PTR_ERR(pwrseq->ext_clk) != -ENOENT)
+		return PTR_ERR(pwrseq->ext_clk);
+
+	pwrseq->reset_gpios = devm_gpiod_get_array(dev, "reset",
+							GPIOD_OUT_HIGH);
+	if (IS_ERR(pwrseq->reset_gpios) &&
+	    PTR_ERR(pwrseq->reset_gpios) != -ENOENT &&
+	    PTR_ERR(pwrseq->reset_gpios) != -ENOSYS) {
+		return PTR_ERR(pwrseq->reset_gpios);
+	}
+
+	device_property_read_u32(dev, "post-power-on-delay-ms",
+				 &pwrseq->post_power_on_delay_ms);
+	device_property_read_u32(dev, "power-off-delay-us",
+				 &pwrseq->power_off_delay_us);
+
+	pwrseq->pwrseq.dev = dev;
+	pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops;
+	pwrseq->pwrseq.owner = THIS_MODULE;
+	platform_set_drvdata(pdev, pwrseq);
+
+	return mmc_pwrseq_register(&pwrseq->pwrseq);
+}
+
+static int mmc_pwrseq_simple_remove(struct platform_device *pdev)
+{
+	struct mmc_pwrseq_simple *pwrseq = platform_get_drvdata(pdev);
+
+	mmc_pwrseq_unregister(&pwrseq->pwrseq);
+
+	return 0;
+}
+
+static struct platform_driver mmc_pwrseq_simple_driver = {
+	.probe = mmc_pwrseq_simple_probe,
+	.remove = mmc_pwrseq_simple_remove,
+	.driver = {
+		.name = "pwrseq_simple",
+		.of_match_table = mmc_pwrseq_simple_of_match,
+	},
+};
+
+module_platform_driver(mmc_pwrseq_simple_driver);
+MODULE_LICENSE("GPL v2");