Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 175 insertions, 0 deletions

diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c
new file mode 100644
index 000000000..806f0bb3a
--- /dev/null
+++ b/drivers/pwm/pwm-lpc32xx.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2012 Alexandre Pereira da Silva <aletes.xgr@gmail.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+
+struct lpc32xx_pwm_chip {
+	struct pwm_chip chip;
+	struct clk *clk;
+	void __iomem *base;
+};
+
+#define PWM_ENABLE	BIT(31)
+#define PWM_PIN_LEVEL	BIT(30)
+
+#define to_lpc32xx_pwm_chip(_chip) \
+	container_of(_chip, struct lpc32xx_pwm_chip, chip)
+
+static int lpc32xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+			      int duty_ns, int period_ns)
+{
+	struct lpc32xx_pwm_chip *lpc32xx = to_lpc32xx_pwm_chip(chip);
+	unsigned long long c;
+	int period_cycles, duty_cycles;
+	u32 val;
+	c = clk_get_rate(lpc32xx->clk);
+
+	/* The highest acceptable divisor is 256, which is represented by 0 */
+	period_cycles = div64_u64(c * period_ns,
+			       (unsigned long long)NSEC_PER_SEC * 256);
+	if (!period_cycles || period_cycles > 256)
+		return -ERANGE;
+	if (period_cycles == 256)
+		period_cycles = 0;
+
+	/* Compute 256 x #duty/period value and care for corner cases */
+	duty_cycles = div64_u64((unsigned long long)(period_ns - duty_ns) * 256,
+				period_ns);
+	if (!duty_cycles)
+		duty_cycles = 1;
+	if (duty_cycles > 255)
+		duty_cycles = 255;
+
+	val = readl(lpc32xx->base);
+	val &= ~0xFFFF;
+	val |= (period_cycles << 8) | duty_cycles;
+	writel(val, lpc32xx->base);
+
+	return 0;
+}
+
+static int lpc32xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct lpc32xx_pwm_chip *lpc32xx = to_lpc32xx_pwm_chip(chip);
+	u32 val;
+	int ret;
+
+	ret = clk_prepare_enable(lpc32xx->clk);
+	if (ret)
+		return ret;
+
+	val = readl(lpc32xx->base);
+	val |= PWM_ENABLE;
+	writel(val, lpc32xx->base);
+
+	return 0;
+}
+
+static void lpc32xx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct lpc32xx_pwm_chip *lpc32xx = to_lpc32xx_pwm_chip(chip);
+	u32 val;
+
+	val = readl(lpc32xx->base);
+	val &= ~PWM_ENABLE;
+	writel(val, lpc32xx->base);
+
+	clk_disable_unprepare(lpc32xx->clk);
+}
+
+static int lpc32xx_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			     const struct pwm_state *state)
+{
+	int err;
+
+	if (state->polarity != PWM_POLARITY_NORMAL)
+		return -EINVAL;
+
+	if (!state->enabled) {
+		if (pwm->state.enabled)
+			lpc32xx_pwm_disable(chip, pwm);
+
+		return 0;
+	}
+
+	err = lpc32xx_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period);
+	if (err)
+		return err;
+
+	if (!pwm->state.enabled)
+		err = lpc32xx_pwm_enable(chip, pwm);
+
+	return err;
+}
+
+static const struct pwm_ops lpc32xx_pwm_ops = {
+	.apply = lpc32xx_pwm_apply,
+	.owner = THIS_MODULE,
+};
+
+static int lpc32xx_pwm_probe(struct platform_device *pdev)
+{
+	struct lpc32xx_pwm_chip *lpc32xx;
+	int ret;
+	u32 val;
+
+	lpc32xx = devm_kzalloc(&pdev->dev, sizeof(*lpc32xx), GFP_KERNEL);
+	if (!lpc32xx)
+		return -ENOMEM;
+
+	lpc32xx->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(lpc32xx->base))
+		return PTR_ERR(lpc32xx->base);
+
+	lpc32xx->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(lpc32xx->clk))
+		return PTR_ERR(lpc32xx->clk);
+
+	lpc32xx->chip.dev = &pdev->dev;
+	lpc32xx->chip.ops = &lpc32xx_pwm_ops;
+	lpc32xx->chip.npwm = 1;
+
+	/* If PWM is disabled, configure the output to the default value */
+	val = readl(lpc32xx->base);
+	val &= ~PWM_PIN_LEVEL;
+	writel(val, lpc32xx->base);
+
+	ret = devm_pwmchip_add(&pdev->dev, &lpc32xx->chip);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to add PWM chip, error %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id lpc32xx_pwm_dt_ids[] = {
+	{ .compatible = "nxp,lpc3220-pwm", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, lpc32xx_pwm_dt_ids);
+
+static struct platform_driver lpc32xx_pwm_driver = {
+	.driver = {
+		.name = "lpc32xx-pwm",
+		.of_match_table = lpc32xx_pwm_dt_ids,
+	},
+	.probe = lpc32xx_pwm_probe,
+};
+module_platform_driver(lpc32xx_pwm_driver);
+
+MODULE_ALIAS("platform:lpc32xx-pwm");
+MODULE_AUTHOR("Alexandre Pereira da Silva <aletes.xgr@gmail.com>");
+MODULE_DESCRIPTION("LPC32XX PWM Driver");
+MODULE_LICENSE("GPL v2");