pwm: Move Blackfin PWM driver to PWM framework

This commit moves the Blackfin PWM driver to the drivers/pwm sub-
directory and converts it to register with the new PWM framework.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

3 files changed, 174 insertions, 0 deletions

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index bda6f23af532..eb5404268135 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -9,6 +9,15 @@ menuconfig PWM
 
 if PWM
 
+config PWM_BFIN
+        tristate "Blackfin PWM support"
+        depends on BFIN_GPTIMERS
+        help
+          Generic PWM framework driver for Blackfin.
+
+          To compile this driver as a module, choose M here: the module
+          will be called pwm-bfin.
+
 config PWM_TEGRA
         tristate "NVIDIA Tegra PWM support"
         depends on ARCH_TEGRA
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index 12300f5e9016..251b8d22435f 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_PWM)               += core.o
+obj-$(CONFIG_PWM_BFIN)          += pwm-bfin.o
 obj-$(CONFIG_PWM_TEGRA)         += pwm-tegra.o
diff --git a/drivers/pwm/pwm-bfin.c b/drivers/pwm/pwm-bfin.c
new file mode 100644
index 000000000000..a0c6bf9070ea
--- /dev/null
+++ b/drivers/pwm/pwm-bfin.c
@@ -0,0 +1,164 @@
+/*
+ * Blackfin Pulse Width Modulation (PWM) core
+ *
+ * Copyright (c) 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+
+#include <asm/gptimers.h>
+#include <asm/portmux.h>
+
+struct bfin_pwm_chip {
+        struct pwm_chip chip;
+};
+
+struct bfin_pwm {
+        unsigned short pin;
+};
+
+static const unsigned short pwm_to_gptimer_per[] = {
+        P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR4, P_TMR5,
+        P_TMR6, P_TMR7, P_TMR8, P_TMR9, P_TMR10, P_TMR11,
+};
+
+static int bfin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+        struct bfin_pwm *priv;
+        int ret;
+
+        if (pwm->hwpwm >= ARRAY_SIZE(pwm_to_gptimer_per))
+                return -EINVAL;
+
+        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        priv->pin = pwm_to_gptimer_per[pwm->hwpwm];
+
+        ret = peripheral_request(priv->pin, NULL);
+        if (ret) {
+                kfree(priv);
+                return ret;
+        }
+
+        pwm_set_chip_data(pwm, priv);
+
+        return 0;
+}
+
+static void bfin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+        struct bfin_pwm *priv = pwm_get_chip_data(pwm);
+
+        if (priv) {
+                peripheral_free(priv->pin);
+                kfree(priv);
+        }
+}
+
+static int bfin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+                int duty_ns, int period_ns)
+{
+        struct bfin_pwm *priv = pwm_get_chip_data(pwm);
+        unsigned long period, duty;
+        unsigned long long val;
+
+        if (duty_ns < 0 || duty_ns > period_ns)
+                return -EINVAL;
+
+        val = (unsigned long long)get_sclk() * period_ns;
+        do_div(val, NSEC_PER_SEC);
+        period = val;
+
+        val = (unsigned long long)period * duty_ns;
+        do_div(val, period_ns);
+        duty = period - val;
+
+        if (duty >= period)
+                duty = period - 1;
+
+        set_gptimer_config(priv->pin, TIMER_MODE_PWM | TIMER_PERIOD_CNT);
+        set_gptimer_pwidth(priv->pin, duty);
+        set_gptimer_period(priv->pin, period);
+
+        return 0;
+}
+
+static int bfin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+        struct bfin_pwm *priv = pwm_get_chip_data(pwm);
+
+        enable_gptimer(priv->pin);
+
+        return 0;
+}
+
+static void bfin_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+        struct bfin_pwm *priv = pwm_get_chip_data(pwm);
+
+        disable_gptimer(priv->pin);
+}
+
+static struct pwm_ops bfin_pwm_ops = {
+        .request = bfin_pwm_request,
+        .free = bfin_pwm_free,
+        .config = bfin_pwm_config,
+        .enable = bfin_pwm_enable,
+        .disable = bfin_pwm_disable,
+        .owner = THIS_MODULE,
+};
+
+static int bfin_pwm_probe(struct platform_device *pdev)
+{
+        struct bfin_pwm_chip *pwm;
+        int ret;
+
+        pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
+        if (!pwm) {
+                dev_err(&pdev->dev, "failed to allocate memory\n");
+                return -ENOMEM;
+        }
+
+        platform_set_drvdata(pdev, pwm);
+
+        pwm->chip.dev = &pdev->dev;
+        pwm->chip.ops = &bfin_pwm_ops;
+        pwm->chip.base = -1;
+        pwm->chip.npwm = 12;
+
+        ret = pwmchip_add(&pwm->chip);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int __devexit bfin_pwm_remove(struct platform_device *pdev)
+{
+        struct bfin_pwm_chip *pwm = platform_get_drvdata(pdev);
+
+        pwmchip_remove(&pwm->chip);
+
+        return 0;
+}
+
+static struct platform_driver bfin_pwm_driver = {
+        .driver = {
+                .name = "bfin-pwm",
+        },
+        .probe = bfin_pwm_probe,
+        .remove = __devexit_p(bfin_pwm_remove),
+};
+
+module_platform_driver(bfin_pwm_driver);
+
+MODULE_LICENSE("GPL");