v4.19.13 snapshot.
diff --git a/drivers/pwm/pwm-berlin.c b/drivers/pwm/pwm-berlin.c
new file mode 100644
index 0000000..7c8d6a1
--- /dev/null
+++ b/drivers/pwm/pwm-berlin.c
@@ -0,0 +1,307 @@
+/*
+ * Marvell Berlin PWM driver
+ *
+ * Copyright (C) 2015 Marvell Technology Group Ltd.
+ *
+ * Author: Antoine Tenart <antoine.tenart@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#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>
+#include <linux/slab.h>
+
+#define BERLIN_PWM_EN 0x0
+#define BERLIN_PWM_ENABLE BIT(0)
+#define BERLIN_PWM_CONTROL 0x4
+/*
+ * The prescaler claims to support 8 different moduli, configured using the
+ * low three bits of PWM_CONTROL. (Sequentially, they are 1, 4, 8, 16, 64,
+ * 256, 1024, and 4096.) However, the moduli from 4 to 1024 appear to be
+ * implemented by internally shifting TCNT left without adding additional
+ * bits. So, the max TCNT that actually works for a modulus of 4 is 0x3fff;
+ * for 8, 0x1fff; and so on. This means that those moduli are entirely
+ * useless, as we could just do the shift ourselves. The 4096 modulus is
+ * implemented with a real prescaler, so we do use that, but we treat it
+ * as a flag instead of pretending the modulus is actually configurable.
+ */
+#define BERLIN_PWM_PRESCALE_4096 0x7
+#define BERLIN_PWM_INVERT_POLARITY BIT(3)
+#define BERLIN_PWM_DUTY 0x8
+#define BERLIN_PWM_TCNT 0xc
+#define BERLIN_PWM_MAX_TCNT 65535
+
+struct berlin_pwm_channel {
+ u32 enable;
+ u32 ctrl;
+ u32 duty;
+ u32 tcnt;
+};
+
+struct berlin_pwm_chip {
+ struct pwm_chip chip;
+ struct clk *clk;
+ void __iomem *base;
+};
+
+static inline struct berlin_pwm_chip *to_berlin_pwm_chip(struct pwm_chip *chip)
+{
+ return container_of(chip, struct berlin_pwm_chip, chip);
+}
+
+static inline u32 berlin_pwm_readl(struct berlin_pwm_chip *chip,
+ unsigned int channel, unsigned long offset)
+{
+ return readl_relaxed(chip->base + channel * 0x10 + offset);
+}
+
+static inline void berlin_pwm_writel(struct berlin_pwm_chip *chip,
+ unsigned int channel, u32 value,
+ unsigned long offset)
+{
+ writel_relaxed(value, chip->base + channel * 0x10 + offset);
+}
+
+static int berlin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct berlin_pwm_channel *channel;
+
+ channel = kzalloc(sizeof(*channel), GFP_KERNEL);
+ if (!channel)
+ return -ENOMEM;
+
+ return pwm_set_chip_data(pwm, channel);
+}
+
+static void berlin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct berlin_pwm_channel *channel = pwm_get_chip_data(pwm);
+
+ pwm_set_chip_data(pwm, NULL);
+ kfree(channel);
+}
+
+static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm_dev,
+ int duty_ns, int period_ns)
+{
+ struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip);
+ bool prescale_4096 = false;
+ u32 value, duty, period;
+ u64 cycles;
+
+ cycles = clk_get_rate(pwm->clk);
+ cycles *= period_ns;
+ do_div(cycles, NSEC_PER_SEC);
+
+ if (cycles > BERLIN_PWM_MAX_TCNT) {
+ prescale_4096 = true;
+ cycles >>= 12; // Prescaled by 4096
+
+ if (cycles > BERLIN_PWM_MAX_TCNT)
+ return -ERANGE;
+ }
+
+ period = cycles;
+ cycles *= duty_ns;
+ do_div(cycles, period_ns);
+ duty = cycles;
+
+ value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_CONTROL);
+ if (prescale_4096)
+ value |= BERLIN_PWM_PRESCALE_4096;
+ else
+ value &= ~BERLIN_PWM_PRESCALE_4096;
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_CONTROL);
+
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, duty, BERLIN_PWM_DUTY);
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, period, BERLIN_PWM_TCNT);
+
+ return 0;
+}
+
+static int berlin_pwm_set_polarity(struct pwm_chip *chip,
+ struct pwm_device *pwm_dev,
+ enum pwm_polarity polarity)
+{
+ struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip);
+ u32 value;
+
+ value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_CONTROL);
+
+ if (polarity == PWM_POLARITY_NORMAL)
+ value &= ~BERLIN_PWM_INVERT_POLARITY;
+ else
+ value |= BERLIN_PWM_INVERT_POLARITY;
+
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_CONTROL);
+
+ return 0;
+}
+
+static int berlin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm_dev)
+{
+ struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip);
+ u32 value;
+
+ value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_EN);
+ value |= BERLIN_PWM_ENABLE;
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_EN);
+
+ return 0;
+}
+
+static void berlin_pwm_disable(struct pwm_chip *chip,
+ struct pwm_device *pwm_dev)
+{
+ struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip);
+ u32 value;
+
+ value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_EN);
+ value &= ~BERLIN_PWM_ENABLE;
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_EN);
+}
+
+static const struct pwm_ops berlin_pwm_ops = {
+ .request = berlin_pwm_request,
+ .free = berlin_pwm_free,
+ .config = berlin_pwm_config,
+ .set_polarity = berlin_pwm_set_polarity,
+ .enable = berlin_pwm_enable,
+ .disable = berlin_pwm_disable,
+ .owner = THIS_MODULE,
+};
+
+static const struct of_device_id berlin_pwm_match[] = {
+ { .compatible = "marvell,berlin-pwm" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, berlin_pwm_match);
+
+static int berlin_pwm_probe(struct platform_device *pdev)
+{
+ struct berlin_pwm_chip *pwm;
+ struct resource *res;
+ int ret;
+
+ pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
+ if (!pwm)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ pwm->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pwm->base))
+ return PTR_ERR(pwm->base);
+
+ pwm->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(pwm->clk))
+ return PTR_ERR(pwm->clk);
+
+ ret = clk_prepare_enable(pwm->clk);
+ if (ret)
+ return ret;
+
+ pwm->chip.dev = &pdev->dev;
+ pwm->chip.ops = &berlin_pwm_ops;
+ pwm->chip.base = -1;
+ pwm->chip.npwm = 4;
+ pwm->chip.of_xlate = of_pwm_xlate_with_flags;
+ pwm->chip.of_pwm_n_cells = 3;
+
+ ret = pwmchip_add(&pwm->chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
+ clk_disable_unprepare(pwm->clk);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, pwm);
+
+ return 0;
+}
+
+static int berlin_pwm_remove(struct platform_device *pdev)
+{
+ struct berlin_pwm_chip *pwm = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = pwmchip_remove(&pwm->chip);
+ clk_disable_unprepare(pwm->clk);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int berlin_pwm_suspend(struct device *dev)
+{
+ struct berlin_pwm_chip *pwm = dev_get_drvdata(dev);
+ unsigned int i;
+
+ for (i = 0; i < pwm->chip.npwm; i++) {
+ struct berlin_pwm_channel *channel;
+
+ channel = pwm_get_chip_data(&pwm->chip.pwms[i]);
+ if (!channel)
+ continue;
+
+ channel->enable = berlin_pwm_readl(pwm, i, BERLIN_PWM_ENABLE);
+ channel->ctrl = berlin_pwm_readl(pwm, i, BERLIN_PWM_CONTROL);
+ channel->duty = berlin_pwm_readl(pwm, i, BERLIN_PWM_DUTY);
+ channel->tcnt = berlin_pwm_readl(pwm, i, BERLIN_PWM_TCNT);
+ }
+
+ clk_disable_unprepare(pwm->clk);
+
+ return 0;
+}
+
+static int berlin_pwm_resume(struct device *dev)
+{
+ struct berlin_pwm_chip *pwm = dev_get_drvdata(dev);
+ unsigned int i;
+ int ret;
+
+ ret = clk_prepare_enable(pwm->clk);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < pwm->chip.npwm; i++) {
+ struct berlin_pwm_channel *channel;
+
+ channel = pwm_get_chip_data(&pwm->chip.pwms[i]);
+ if (!channel)
+ continue;
+
+ berlin_pwm_writel(pwm, i, channel->ctrl, BERLIN_PWM_CONTROL);
+ berlin_pwm_writel(pwm, i, channel->duty, BERLIN_PWM_DUTY);
+ berlin_pwm_writel(pwm, i, channel->tcnt, BERLIN_PWM_TCNT);
+ berlin_pwm_writel(pwm, i, channel->enable, BERLIN_PWM_ENABLE);
+ }
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(berlin_pwm_pm_ops, berlin_pwm_suspend,
+ berlin_pwm_resume);
+
+static struct platform_driver berlin_pwm_driver = {
+ .probe = berlin_pwm_probe,
+ .remove = berlin_pwm_remove,
+ .driver = {
+ .name = "berlin-pwm",
+ .of_match_table = berlin_pwm_match,
+ .pm = &berlin_pwm_pm_ops,
+ },
+};
+module_platform_driver(berlin_pwm_driver);
+
+MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
+MODULE_DESCRIPTION("Marvell Berlin PWM driver");
+MODULE_LICENSE("GPL v2");