[PATCH v3 2/2] pwm: sunplus-pwm: Add Sunplus SoC SP7021 PWM Driver

[Hammer Hsieh <hammerh0314@gmail.com>]

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Add Sunplus SoC SP7021 PWM Driver

Signed-off-by: Hammer Hsieh <hammerh0314@gmail.com>
---
Changes in v3:
 - Addressed all comments from Uwe Kleine-König.

 MAINTAINERS               |   1 +
 drivers/pwm/Kconfig       |  11 +++
 drivers/pwm/Makefile      |   1 +
 drivers/pwm/pwm-sunplus.c | 232 ++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 245 insertions(+)
 create mode 100644 drivers/pwm/pwm-sunplus.c

diff --git a/MAINTAINERS b/MAINTAINERS
index e1cb7eb..6644bae 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18535,6 +18535,7 @@ SUNPLUS PWM DRIVER
 M:	Hammer Hsieh <hammerh0314@gmail.com>
 S:	Maintained
 F:	Documentation/devicetree/bindings/pwm/sunplus,sp7021-pwm.yaml
+F:	drivers/pwm/pwm-sunplus.c
 
 SUNPLUS RTC DRIVER
 M:	Vincent Shih <vincent.sunplus@gmail.com>
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 21e3b05..54cfb50 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -572,6 +572,17 @@ config PWM_SUN4I
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-sun4i.
 
+config PWM_SUNPLUS
+	tristate "Sunplus PWM support"
+	depends on ARCH_SUNPLUS || COMPILE_TEST
+	depends on HAS_IOMEM && OF
+	help
+	  Generic PWM framework driver for the PWM controller on
+	  Sunplus SoCs.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pwm-sunplus.
+
 config PWM_TEGRA
 	tristate "NVIDIA Tegra PWM support"
 	depends on ARCH_TEGRA || COMPILE_TEST
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index 708840b..be58616 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_PWM_STM32)		+= pwm-stm32.o
 obj-$(CONFIG_PWM_STM32_LP)	+= pwm-stm32-lp.o
 obj-$(CONFIG_PWM_STMPE)		+= pwm-stmpe.o
 obj-$(CONFIG_PWM_SUN4I)		+= pwm-sun4i.o
+obj-$(CONFIG_PWM_SUNPLUS)	+= pwm-sunplus.o
 obj-$(CONFIG_PWM_TEGRA)		+= pwm-tegra.o
 obj-$(CONFIG_PWM_TIECAP)	+= pwm-tiecap.o
 obj-$(CONFIG_PWM_TIEHRPWM)	+= pwm-tiehrpwm.o
diff --git a/drivers/pwm/pwm-sunplus.c b/drivers/pwm/pwm-sunplus.c
new file mode 100644
index 0000000..b6ab077
--- /dev/null
+++ b/drivers/pwm/pwm-sunplus.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PWM device driver for SUNPLUS SP7021 SoC
+ *
+ * Links:
+ *   Reference Manual:
+ *   https://sunplus-tibbo.atlassian.net/wiki/spaces/doc/overview
+ *
+ *   Reference Manual(PWM module):
+ *   https://sunplus.atlassian.net/wiki/spaces/doc/pages/461144198/12.+Pulse+Width+Modulation+PWM
+ *
+ * Limitations:
+ * - Only supports normal polarity.
+ * - It output low when PWM channel disabled.
+ * - When the parameters change, current running period will not be completed
+ *     and run new settings immediately.
+ * - In .apply() PWM output need to write register FREQ and DUTY. When first write FREQ
+ *     done and not yet write DUTY, it has short timing gap use new FREQ and old DUTY.
+ *
+ * Author: Hammer Hsieh <hammerh0314@gmail.com>
+ */
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+
+#define SP7021_PWM_CONTROL0		0x000
+#define SP7021_PWM_CONTROL1		0x004
+#define SP7021_PWM_FREQ(ch)		(0x008 + 4 * (ch))
+#define SP7021_PWM_DUTY(ch)		(0x018 + 4 * (ch))
+#define SP7021_PWM_FREQ_MAX		GENMASK(15, 0)
+#define SP7021_PWM_DUTY_MAX		GENMASK(7, 0)
+#define SP7021_PWM_CONTROL_EN(ch)	BIT(ch)
+
+#define SP7021_PWM_NUM			4
+#define SP7021_PWM_BYPASS_BIT_SHIFT	8
+#define SP7021_PWM_DD_SEL_BIT_SHIFT	8
+#define SP7021_PWM_FREQ_SCALER		256
+
+struct sunplus_pwm {
+	struct pwm_chip chip;
+	void __iomem *base;
+	struct clk *clk;
+};
+
+static inline struct sunplus_pwm *to_sunplus_pwm(struct pwm_chip *chip)
+{
+	return container_of(chip, struct sunplus_pwm, chip);
+}
+
+static int sunplus_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			     const struct pwm_state *state)
+{
+	struct sunplus_pwm *priv = to_sunplus_pwm(chip);
+	u32 dd_freq, duty, control0, control1;
+	u64 max_period, period_ns, duty_ns, clk_rate;
+
+	if (state->polarity != pwm->state.polarity)
+		return -EINVAL;
+
+	if (!state->enabled) {
+		/* disable pwm channel output */
+		control0 = readl(priv->base + SP7021_PWM_CONTROL0);
+		control0 &= ~SP7021_PWM_CONTROL_EN(pwm->hwpwm);
+		writel(control0, priv->base + SP7021_PWM_CONTROL0);
+		/* disable pwm channel clk source */
+		control1 = readl(priv->base + SP7021_PWM_CONTROL1);
+		control1 &= ~SP7021_PWM_CONTROL_EN(pwm->hwpwm);
+		writel(control1, priv->base + SP7021_PWM_CONTROL1);
+		return 0;
+	}
+
+	clk_rate = clk_get_rate(priv->clk);
+	/*
+	 * SP7021_PWM_FREQ_MAX 16 bits, SP7021_PWM_FREQ_SCALER 8 bits
+	 * NSEC_PER_SEC 30 bits, won't overflow.
+	 */
+	max_period = mul_u64_u64_div_u64(SP7021_PWM_FREQ_MAX, (u64)SP7021_PWM_FREQ_SCALER
+				* NSEC_PER_SEC, clk_rate);
+
+	period_ns = min(state->period, max_period);
+	duty_ns = state->duty_cycle;
+
+	/*
+	 * cal pwm freq and check value under range
+	 * clk_rate 202.5MHz 28 bits, period_ns max 82849185 27 bits, won't overflow.
+	 */
+	dd_freq = mul_u64_u64_div_u64(clk_rate, period_ns, (u64)SP7021_PWM_FREQ_SCALER
+				* NSEC_PER_SEC);
+
+	if (dd_freq == 0)
+		return -EINVAL;
+
+	if (dd_freq > SP7021_PWM_FREQ_MAX)
+		dd_freq = SP7021_PWM_FREQ_MAX;
+
+	writel(dd_freq, priv->base + SP7021_PWM_FREQ(pwm->hwpwm));
+
+	/* cal and set pwm duty */
+	control0 = readl(priv->base + SP7021_PWM_CONTROL0);
+	control0 |= SP7021_PWM_CONTROL_EN(pwm->hwpwm);
+	control1 = readl(priv->base + SP7021_PWM_CONTROL1);
+	control1 |= SP7021_PWM_CONTROL_EN(pwm->hwpwm);
+	if (duty_ns == period_ns) {
+		/* PWM channel output = high */
+		control0 |= SP7021_PWM_CONTROL_EN(pwm->hwpwm + SP7021_PWM_BYPASS_BIT_SHIFT);
+		duty = SP7021_PWM_DUTY_MAX;
+	} else {
+		control0 &= ~SP7021_PWM_CONTROL_EN(pwm->hwpwm + SP7021_PWM_BYPASS_BIT_SHIFT);
+		/*
+		 * duty_ns <= period_ns 27 bits, SP7021_PWM_FREQ_SCALER 8 bits
+		 * won't overflow.
+		 */
+		duty = mul_u64_u64_div_u64(duty_ns, (u64)SP7021_PWM_FREQ_SCALER,
+					   period_ns);
+		duty |= (pwm->hwpwm << SP7021_PWM_DD_SEL_BIT_SHIFT);
+	}
+	writel(duty, priv->base + SP7021_PWM_DUTY(pwm->hwpwm));
+	writel(control1, priv->base + SP7021_PWM_CONTROL1);
+	writel(control0, priv->base + SP7021_PWM_CONTROL0);
+
+	return 0;
+}
+
+static void sunplus_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
+				  struct pwm_state *state)
+{
+	struct sunplus_pwm *priv = to_sunplus_pwm(chip);
+	u32 control0, freq, duty;
+	u64 clk_rate;
+
+	control0 = readl(priv->base + SP7021_PWM_CONTROL0);
+
+	if (control0 & BIT(pwm->hwpwm)) {
+		clk_rate = clk_get_rate(priv->clk);
+		freq = readl(priv->base + SP7021_PWM_FREQ(pwm->hwpwm));
+		duty = readl(priv->base + SP7021_PWM_DUTY(pwm->hwpwm));
+		duty &= ~GENMASK(9, 8);
+		/*
+		 * freq 16 bits, SP7021_PWM_FREQ_SCALER 8 bits
+		 * NSEC_PER_SEC 30 bits, won't overflow.
+		 */
+		state->period = DIV64_U64_ROUND_UP((u64)freq * (u64)SP7021_PWM_FREQ_SCALER
+						* NSEC_PER_SEC, clk_rate);
+		/*
+		 * freq 16 bits, duty 8 bits, NSEC_PER_SEC 30 bits, won't overflow.
+		 */
+		state->duty_cycle = DIV64_U64_ROUND_UP((u64)freq * (u64)duty * NSEC_PER_SEC,
+						       clk_rate);
+		state->enabled = true;
+	} else {
+		state->enabled = false;
+	}
+
+	state->polarity = PWM_POLARITY_NORMAL;
+}
+
+static const struct pwm_ops sunplus_pwm_ops = {
+	.apply = sunplus_pwm_apply,
+	.get_state = sunplus_pwm_get_state,
+	.owner = THIS_MODULE,
+};
+
+static void sunplus_pwm_clk_release(void *data)
+{
+	struct clk *clk = data;
+
+	clk_disable_unprepare(clk);
+}
+
+static int sunplus_pwm_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct sunplus_pwm *priv;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	priv->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(priv->clk))
+		return dev_err_probe(dev, PTR_ERR(priv->clk),
+				     "get pwm clock failed\n");
+
+	ret = clk_prepare_enable(priv->clk);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable clock: %d\n", ret);
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(dev, sunplus_pwm_clk_release, priv->clk);
+	if (ret < 0) {
+		dev_err(dev, "failed to release clock: %d\n", ret);
+		return ret;
+	}
+
+	priv->chip.dev = dev;
+	priv->chip.ops = &sunplus_pwm_ops;
+	priv->chip.npwm = SP7021_PWM_NUM;
+
+	ret = devm_pwmchip_add(dev, &priv->chip);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Cannot register sunplus PWM\n");
+
+	return 0;
+}
+
+static const struct of_device_id sunplus_pwm_of_match[] = {
+	{ .compatible = "sunplus,sp7021-pwm", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, sunplus_pwm_of_match);
+
+static struct platform_driver sunplus_pwm_driver = {
+	.probe		= sunplus_pwm_probe,
+	.driver		= {
+		.name	= "sunplus-pwm",
+		.of_match_table = sunplus_pwm_of_match,
+	},
+};
+module_platform_driver(sunplus_pwm_driver);
+
+MODULE_DESCRIPTION("Sunplus SoC PWM Driver");
+MODULE_AUTHOR("Hammer Hsieh <hammerh0314@gmail.com>");
+MODULE_LICENSE("GPL");
-- 
2.7.4