pwm: Add BCM2835 PWM driver

Add PWM driver for Broadcom BCM2835 processor (Raspberry Pi)

Signed-off-by: Bart Tanghe <bart.tanghe@thomasmore.be>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

4 files changed, 245 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/pwm/pwm-bcm2835.txt b/Documentation/devicetree/bindings/pwm/pwm-bcm2835.txt
new file mode 100644
index 000000000000..fb6fb31bc4c4
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/pwm-bcm2835.txt
@@ -0,0 +1,30 @@
+BCM2835 PWM controller (Raspberry Pi controller)
+
+Required properties:
+- compatible: should be "brcm,bcm2835-pwm"
+- reg: physical base address and length of the controller's registers
+- clock: This clock defines the base clock frequency of the PWM hardware
+  system, the period and the duty_cycle of the PWM signal is a multiple of
+  the base period.
+- #pwm-cells: Should be 2. See pwm.txt in this directory for a description of
+  the cells format.
+
+Examples:
+
+pwm@2020c000 {
+        compatible = "brcm,bcm2835-pwm";
+        reg = <0x2020c000 0x28>;
+        clocks = <&clk_pwm>;
+        #pwm-cells = <2>;
+};
+
+clocks {
+        ....
+                clk_pwm: pwm {
+                        compatible = "fixed-clock";
+                        reg = <3>;
+                        #clock-cells = <0>;
+                        clock-frequency = <9200000>;
+                };
+        ....
+};
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index ef2dd2e4754b..ddabe3983549 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -71,6 +71,15 @@ config PWM_BCM_KONA
           To compile this driver as a module, choose M here: the module
           will be called pwm-bcm-kona.
 
+config PWM_BCM2835
+        tristate "BCM2835 PWM support"
+        depends on ARCH_BCM2835
+        help
+          PWM framework driver for BCM2835 controller (Raspberry Pi)
+
+          To compile this driver as a module, choose M here: the module
+          will be called pwm-bcm2835.
+
 config PWM_BFIN
         tristate "Blackfin PWM support"
         depends on BFIN_GPTIMERS
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index c458606c3755..88be33bbfdf6 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_PWM_AB8500)	+= pwm-ab8500.o
 obj-$(CONFIG_PWM_ATMEL)         += pwm-atmel.o
 obj-$(CONFIG_PWM_ATMEL_TCB)     += pwm-atmel-tcb.o
 obj-$(CONFIG_PWM_BCM_KONA)      += pwm-bcm-kona.o
+obj-$(CONFIG_PWM_BCM2835)       += pwm-bcm2835.o
 obj-$(CONFIG_PWM_BFIN)          += pwm-bfin.o
 obj-$(CONFIG_PWM_CLPS711X)      += pwm-clps711x.o
 obj-$(CONFIG_PWM_EP93XX)        += pwm-ep93xx.o
diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c
new file mode 100644
index 000000000000..b4c7f956b6fa
--- /dev/null
+++ b/drivers/pwm/pwm-bcm2835.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright 2014 Bart Tanghe <bart.tanghe@thomasmore.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+
+#define PWM_CONTROL             0x000
+#define PWM_CONTROL_SHIFT(x)    ((x) * 8)
+#define PWM_CONTROL_MASK        0xff
+#define PWM_MODE                0x80            /* set timer in PWM mode */
+#define PWM_ENABLE              (1 << 0)
+#define PWM_POLARITY            (1 << 4)
+
+#define PERIOD(x)               (((x) * 0x10) + 0x10)
+#define DUTY(x)                 (((x) * 0x10) + 0x14)
+
+#define MIN_PERIOD              108             /* 9.2 MHz max. PWM clock */
+
+struct bcm2835_pwm {
+        struct pwm_chip chip;
+        struct device *dev;
+        unsigned long scaler;
+        void __iomem *base;
+        struct clk *clk;
+};
+
+static inline struct bcm2835_pwm *to_bcm2835_pwm(struct pwm_chip *chip)
+{
+        return container_of(chip, struct bcm2835_pwm, chip);
+}
+
+static int bcm2835_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+        struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
+        u32 value;
+
+        value = readl(pc->base + PWM_CONTROL);
+        value &= ~(PWM_CONTROL_MASK << PWM_CONTROL_SHIFT(pwm->hwpwm));
+        value |= (PWM_MODE << PWM_CONTROL_SHIFT(pwm->hwpwm));
+        writel(value, pc->base + PWM_CONTROL);
+
+        return 0;
+}
+
+static void bcm2835_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+        struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
+        u32 value;
+
+        value = readl(pc->base + PWM_CONTROL);
+        value &= ~(PWM_CONTROL_MASK << PWM_CONTROL_SHIFT(pwm->hwpwm));
+        writel(value, pc->base + PWM_CONTROL);
+}
+
+static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+                              int duty_ns, int period_ns)
+{
+        struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
+
+        if (period_ns <= MIN_PERIOD) {
+                dev_err(pc->dev, "period %d not supported, minimum %d\n",
+                        period_ns, MIN_PERIOD);
+                return -EINVAL;
+        }
+
+        writel(duty_ns / pc->scaler, pc->base + DUTY(pwm->hwpwm));
+        writel(period_ns / pc->scaler, pc->base + PERIOD(pwm->hwpwm));
+
+        return 0;
+}
+
+static int bcm2835_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+        struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
+        u32 value;
+
+        value = readl(pc->base + PWM_CONTROL);
+        value |= PWM_ENABLE << PWM_CONTROL_SHIFT(pwm->hwpwm);
+        writel(value, pc->base + PWM_CONTROL);
+
+        return 0;
+}
+
+static void bcm2835_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+        struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
+        u32 value;
+
+        value = readl(pc->base + PWM_CONTROL);
+        value &= ~(PWM_ENABLE << PWM_CONTROL_SHIFT(pwm->hwpwm));
+        writel(value, pc->base + PWM_CONTROL);
+}
+
+static int bcm2835_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
+                                enum pwm_polarity polarity)
+{
+        struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
+        u32 value;
+
+        value = readl(pc->base + PWM_CONTROL);
+
+        if (polarity == PWM_POLARITY_NORMAL)
+                value &= ~(PWM_POLARITY << PWM_CONTROL_SHIFT(pwm->hwpwm));
+        else
+                value |= PWM_POLARITY << PWM_CONTROL_SHIFT(pwm->hwpwm);
+
+        writel(value, pc->base + PWM_CONTROL);
+
+        return 0;
+}
+
+static const struct pwm_ops bcm2835_pwm_ops = {
+        .request = bcm2835_pwm_request,
+        .free = bcm2835_pwm_free,
+        .config = bcm2835_pwm_config,
+        .enable = bcm2835_pwm_enable,
+        .disable = bcm2835_pwm_disable,
+        .set_polarity = bcm2835_set_polarity,
+        .owner = THIS_MODULE,
+};
+
+static int bcm2835_pwm_probe(struct platform_device *pdev)
+{
+        struct bcm2835_pwm *pc;
+        struct resource *res;
+        int ret;
+
+        pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
+        if (!pc)
+                return -ENOMEM;
+
+        pc->dev = &pdev->dev;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        pc->base = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(pc->base))
+                return PTR_ERR(pc->base);
+
+        pc->clk = devm_clk_get(&pdev->dev, NULL);
+        if (IS_ERR(pc->clk)) {
+                dev_err(&pdev->dev, "clock not found: %ld\n", PTR_ERR(pc->clk));
+                return PTR_ERR(pc->clk);
+        }
+
+        ret = clk_prepare_enable(pc->clk);
+        if (ret)
+                return ret;
+
+        pc->scaler = NSEC_PER_SEC / clk_get_rate(pc->clk);
+
+        pc->chip.dev = &pdev->dev;
+        pc->chip.ops = &bcm2835_pwm_ops;
+        pc->chip.npwm = 2;
+
+        platform_set_drvdata(pdev, pc);
+
+        ret = pwmchip_add(&pc->chip);
+        if (ret < 0)
+                goto add_fail;
+
+        return 0;
+
+add_fail:
+        clk_disable_unprepare(pc->clk);
+        return ret;
+}
+
+static int bcm2835_pwm_remove(struct platform_device *pdev)
+{
+        struct bcm2835_pwm *pc = platform_get_drvdata(pdev);
+
+        clk_disable_unprepare(pc->clk);
+
+        return pwmchip_remove(&pc->chip);
+}
+
+static const struct of_device_id bcm2835_pwm_of_match[] = {
+        { .compatible = "brcm,bcm2835-pwm", },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm2835_pwm_of_match);
+
+static struct platform_driver bcm2835_pwm_driver = {
+        .driver = {
+                .name = "bcm2835-pwm",
+                .of_match_table = bcm2835_pwm_of_match,
+        },
+        .probe = bcm2835_pwm_probe,
+        .remove = bcm2835_pwm_remove,
+};
+module_platform_driver(bcm2835_pwm_driver);
+
+MODULE_AUTHOR("Bart Tanghe <bart.tanghe@thomasmore.be");
+MODULE_DESCRIPTION("Broadcom BCM2835 PWM driver");
+MODULE_LICENSE("GPL v2");