pwm: Add support for the Berlin PWM controller

Add a PWM controller driver for the Marvell Berlin SoCs. This PWM
controller has 4 channels.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 219 insertions, 0 deletions

diff --git a/drivers/pwm/pwm-berlin.c b/drivers/pwm/pwm-berlin.c
new file mode 100644
index 000000000000..65108129d505
--- /dev/null
+++ b/drivers/pwm/pwm-berlin.c
@@ -0,0 +1,219 @@
+/*
+ * 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>
+
+#define BERLIN_PWM_EN                   0x0
+#define  BERLIN_PWM_ENABLE              BIT(0)
+#define BERLIN_PWM_CONTROL              0x4
+#define  BERLIN_PWM_PRESCALE_MASK       0x7
+#define  BERLIN_PWM_PRESCALE_MAX        4096
+#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_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 const u32 prescaler_table[] = {
+        1, 4, 8, 16, 64, 256, 1024, 4096
+};
+
+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_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);
+        unsigned int prescale;
+        u32 value, duty, period;
+        u64 cycles, tmp;
+
+        cycles = clk_get_rate(pwm->clk);
+        cycles *= period_ns;
+        do_div(cycles, NSEC_PER_SEC);
+
+        for (prescale = 0; prescale < ARRAY_SIZE(prescaler_table); prescale++) {
+                tmp = cycles;
+                do_div(tmp, prescaler_table[prescale]);
+
+                if (tmp <= BERLIN_PWM_MAX_TCNT)
+                        break;
+        }
+
+        if (tmp > BERLIN_PWM_MAX_TCNT)
+                return -ERANGE;
+
+        period = tmp;
+        cycles = tmp * duty_ns;
+        do_div(cycles, period_ns);
+        duty = cycles;
+
+        value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_CONTROL);
+        value &= ~BERLIN_PWM_PRESCALE_MASK;
+        value |= prescale;
+        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 = {
+        .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.can_sleep = true;
+        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;
+}
+
+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,
+        },
+};
+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");