1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-clps711x.c b/drivers/pwm/pwm-clps711x.c
new file mode 100644
index 000000000..b0d91142d
--- /dev/null
+++ b/drivers/pwm/pwm-clps711x.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Cirrus Logic CLPS711X PWM driver
+ * Author: Alexander Shiyan <shc_work@mail.ru>
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+
+struct clps711x_chip {
+	struct pwm_chip chip;
+	void __iomem *pmpcon;
+	struct clk *clk;
+	spinlock_t lock;
+};
+
+static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip)
+{
+	return container_of(chip, struct clps711x_chip, chip);
+}
+
+static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct clps711x_chip *priv = to_clps711x_chip(chip);
+	unsigned int freq = clk_get_rate(priv->clk);
+
+	if (!freq)
+		return -EINVAL;
+
+	/* Store constant period value */
+	pwm->args.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq);
+
+	return 0;
+}
+
+static int clps711x_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			      const struct pwm_state *state)
+{
+	struct clps711x_chip *priv = to_clps711x_chip(chip);
+	/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
+	u32 shift = (pwm->hwpwm + 1) * 4;
+	unsigned long flags;
+	u32 pmpcon, val;
+
+	if (state->polarity != PWM_POLARITY_NORMAL)
+		return -EINVAL;
+
+	if (state->period != pwm->args.period)
+		return -EINVAL;
+
+	if (state->enabled)
+		val = mul_u64_u64_div_u64(state->duty_cycle, 0xf, state->period);
+	else
+		val = 0;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	pmpcon = readl(priv->pmpcon);
+	pmpcon &= ~(0xf << shift);
+	pmpcon |= val << shift;
+	writel(pmpcon, priv->pmpcon);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static const struct pwm_ops clps711x_pwm_ops = {
+	.request = clps711x_pwm_request,
+	.apply = clps711x_pwm_apply,
+	.owner = THIS_MODULE,
+};
+
+static struct pwm_device *clps711x_pwm_xlate(struct pwm_chip *chip,
+					     const struct of_phandle_args *args)
+{
+	if (args->args[0] >= chip->npwm)
+		return ERR_PTR(-EINVAL);
+
+	return pwm_request_from_chip(chip, args->args[0], NULL);
+}
+
+static int clps711x_pwm_probe(struct platform_device *pdev)
+{
+	struct clps711x_chip *priv;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->pmpcon = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->pmpcon))
+		return PTR_ERR(priv->pmpcon);
+
+	priv->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);
+
+	priv->chip.ops = &clps711x_pwm_ops;
+	priv->chip.dev = &pdev->dev;
+	priv->chip.npwm = 2;
+	priv->chip.of_xlate = clps711x_pwm_xlate;
+	priv->chip.of_pwm_n_cells = 1;
+
+	spin_lock_init(&priv->lock);
+
+	return devm_pwmchip_add(&pdev->dev, &priv->chip);
+}
+
+static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = {
+	{ .compatible = "cirrus,ep7209-pwm", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, clps711x_pwm_dt_ids);
+
+static struct platform_driver clps711x_pwm_driver = {
+	.driver = {
+		.name = "clps711x-pwm",
+		.of_match_table = of_match_ptr(clps711x_pwm_dt_ids),
+	},
+	.probe = clps711x_pwm_probe,
+};
+module_platform_driver(clps711x_pwm_driver);
+
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("Cirrus Logic CLPS711X PWM driver");
+MODULE_LICENSE("GPL");