Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 269 insertions, 0 deletions

diff --git a/drivers/pwm/pwm-rcar.c b/drivers/pwm/pwm-rcar.c
new file mode 100644
index 0000000000..5b5f357c44
--- /dev/null
+++ b/drivers/pwm/pwm-rcar.c
@@ -0,0 +1,269 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * R-Car PWM Timer driver
+ *
+ * Copyright (C) 2015 Renesas Electronics Corporation
+ *
+ * Limitations:
+ * - The hardware cannot generate a 0% duty cycle.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/log2.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+
+#define RCAR_PWM_MAX_DIVISION	24
+#define RCAR_PWM_MAX_CYCLE	1023
+
+#define RCAR_PWMCR		0x00
+#define  RCAR_PWMCR_CC0_MASK	0x000f0000
+#define  RCAR_PWMCR_CC0_SHIFT	16
+#define  RCAR_PWMCR_CCMD	BIT(15)
+#define  RCAR_PWMCR_SYNC	BIT(11)
+#define  RCAR_PWMCR_SS0		BIT(4)
+#define  RCAR_PWMCR_EN0		BIT(0)
+
+#define RCAR_PWMCNT		0x04
+#define  RCAR_PWMCNT_CYC0_MASK	0x03ff0000
+#define  RCAR_PWMCNT_CYC0_SHIFT	16
+#define  RCAR_PWMCNT_PH0_MASK	0x000003ff
+#define  RCAR_PWMCNT_PH0_SHIFT	0
+
+struct rcar_pwm_chip {
+	struct pwm_chip chip;
+	void __iomem *base;
+	struct clk *clk;
+};
+
+static inline struct rcar_pwm_chip *to_rcar_pwm_chip(struct pwm_chip *chip)
+{
+	return container_of(chip, struct rcar_pwm_chip, chip);
+}
+
+static void rcar_pwm_write(struct rcar_pwm_chip *rp, u32 data,
+			   unsigned int offset)
+{
+	writel(data, rp->base + offset);
+}
+
+static u32 rcar_pwm_read(struct rcar_pwm_chip *rp, unsigned int offset)
+{
+	return readl(rp->base + offset);
+}
+
+static void rcar_pwm_update(struct rcar_pwm_chip *rp, u32 mask, u32 data,
+			    unsigned int offset)
+{
+	u32 value;
+
+	value = rcar_pwm_read(rp, offset);
+	value &= ~mask;
+	value |= data & mask;
+	rcar_pwm_write(rp, value, offset);
+}
+
+static int rcar_pwm_get_clock_division(struct rcar_pwm_chip *rp, int period_ns)
+{
+	unsigned long clk_rate = clk_get_rate(rp->clk);
+	u64 div, tmp;
+
+	if (clk_rate == 0)
+		return -EINVAL;
+
+	div = (u64)NSEC_PER_SEC * RCAR_PWM_MAX_CYCLE;
+	tmp = (u64)period_ns * clk_rate + div - 1;
+	tmp = div64_u64(tmp, div);
+	div = ilog2(tmp - 1) + 1;
+
+	return (div <= RCAR_PWM_MAX_DIVISION) ? div : -ERANGE;
+}
+
+static void rcar_pwm_set_clock_control(struct rcar_pwm_chip *rp,
+				       unsigned int div)
+{
+	u32 value;
+
+	value = rcar_pwm_read(rp, RCAR_PWMCR);
+	value &= ~(RCAR_PWMCR_CCMD | RCAR_PWMCR_CC0_MASK);
+
+	if (div & 1)
+		value |= RCAR_PWMCR_CCMD;
+
+	div >>= 1;
+
+	value |= div << RCAR_PWMCR_CC0_SHIFT;
+	rcar_pwm_write(rp, value, RCAR_PWMCR);
+}
+
+static int rcar_pwm_set_counter(struct rcar_pwm_chip *rp, int div, int duty_ns,
+				int period_ns)
+{
+	unsigned long long one_cycle, tmp;	/* 0.01 nanoseconds */
+	unsigned long clk_rate = clk_get_rate(rp->clk);
+	u32 cyc, ph;
+
+	one_cycle = NSEC_PER_SEC * 100ULL << div;
+	do_div(one_cycle, clk_rate);
+
+	tmp = period_ns * 100ULL;
+	do_div(tmp, one_cycle);
+	cyc = (tmp << RCAR_PWMCNT_CYC0_SHIFT) & RCAR_PWMCNT_CYC0_MASK;
+
+	tmp = duty_ns * 100ULL;
+	do_div(tmp, one_cycle);
+	ph = tmp & RCAR_PWMCNT_PH0_MASK;
+
+	/* Avoid prohibited setting */
+	if (cyc == 0 || ph == 0)
+		return -EINVAL;
+
+	rcar_pwm_write(rp, cyc | ph, RCAR_PWMCNT);
+
+	return 0;
+}
+
+static int rcar_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	return pm_runtime_get_sync(chip->dev);
+}
+
+static void rcar_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	pm_runtime_put(chip->dev);
+}
+
+static int rcar_pwm_enable(struct rcar_pwm_chip *rp)
+{
+	u32 value;
+
+	/* Don't enable the PWM device if CYC0 or PH0 is 0 */
+	value = rcar_pwm_read(rp, RCAR_PWMCNT);
+	if ((value & RCAR_PWMCNT_CYC0_MASK) == 0 ||
+	    (value & RCAR_PWMCNT_PH0_MASK) == 0)
+		return -EINVAL;
+
+	rcar_pwm_update(rp, RCAR_PWMCR_EN0, RCAR_PWMCR_EN0, RCAR_PWMCR);
+
+	return 0;
+}
+
+static void rcar_pwm_disable(struct rcar_pwm_chip *rp)
+{
+	rcar_pwm_update(rp, RCAR_PWMCR_EN0, 0, RCAR_PWMCR);
+}
+
+static int rcar_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			  const struct pwm_state *state)
+{
+	struct rcar_pwm_chip *rp = to_rcar_pwm_chip(chip);
+	int div, ret;
+
+	/* This HW/driver only supports normal polarity */
+	if (state->polarity != PWM_POLARITY_NORMAL)
+		return -EINVAL;
+
+	if (!state->enabled) {
+		rcar_pwm_disable(rp);
+		return 0;
+	}
+
+	div = rcar_pwm_get_clock_division(rp, state->period);
+	if (div < 0)
+		return div;
+
+	rcar_pwm_update(rp, RCAR_PWMCR_SYNC, RCAR_PWMCR_SYNC, RCAR_PWMCR);
+
+	ret = rcar_pwm_set_counter(rp, div, state->duty_cycle, state->period);
+	if (!ret)
+		rcar_pwm_set_clock_control(rp, div);
+
+	/* The SYNC should be set to 0 even if rcar_pwm_set_counter failed */
+	rcar_pwm_update(rp, RCAR_PWMCR_SYNC, 0, RCAR_PWMCR);
+
+	if (!ret)
+		ret = rcar_pwm_enable(rp);
+
+	return ret;
+}
+
+static const struct pwm_ops rcar_pwm_ops = {
+	.request = rcar_pwm_request,
+	.free = rcar_pwm_free,
+	.apply = rcar_pwm_apply,
+	.owner = THIS_MODULE,
+};
+
+static int rcar_pwm_probe(struct platform_device *pdev)
+{
+	struct rcar_pwm_chip *rcar_pwm;
+	int ret;
+
+	rcar_pwm = devm_kzalloc(&pdev->dev, sizeof(*rcar_pwm), GFP_KERNEL);
+	if (rcar_pwm == NULL)
+		return -ENOMEM;
+
+	rcar_pwm->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(rcar_pwm->base))
+		return PTR_ERR(rcar_pwm->base);
+
+	rcar_pwm->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(rcar_pwm->clk)) {
+		dev_err(&pdev->dev, "cannot get clock\n");
+		return PTR_ERR(rcar_pwm->clk);
+	}
+
+	platform_set_drvdata(pdev, rcar_pwm);
+
+	rcar_pwm->chip.dev = &pdev->dev;
+	rcar_pwm->chip.ops = &rcar_pwm_ops;
+	rcar_pwm->chip.npwm = 1;
+
+	pm_runtime_enable(&pdev->dev);
+
+	ret = pwmchip_add(&rcar_pwm->chip);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to register PWM chip: %d\n", ret);
+		pm_runtime_disable(&pdev->dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void rcar_pwm_remove(struct platform_device *pdev)
+{
+	struct rcar_pwm_chip *rcar_pwm = platform_get_drvdata(pdev);
+
+	pwmchip_remove(&rcar_pwm->chip);
+
+	pm_runtime_disable(&pdev->dev);
+}
+
+static const struct of_device_id rcar_pwm_of_table[] = {
+	{ .compatible = "renesas,pwm-rcar", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, rcar_pwm_of_table);
+
+static struct platform_driver rcar_pwm_driver = {
+	.probe = rcar_pwm_probe,
+	.remove_new = rcar_pwm_remove,
+	.driver = {
+		.name = "pwm-rcar",
+		.of_match_table = rcar_pwm_of_table,
+	}
+};
+module_platform_driver(rcar_pwm_driver);
+
+MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
+MODULE_DESCRIPTION("Renesas PWM Timer Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:pwm-rcar");