Merge tag 'for-3.7-rc1' of git://gitorious.org/linux-pwm/linux-pwm

Pull pwm changes from Thierry Reding:
 "All legacy PWM providers have now been moved to the PWM subsystem.
  The plan for 3.8 is to adapt all board files to provide a lookup table
  for PWM devices in order to get rid of the global namespace.
  Subsequently, users of the legacy pwm_request() and pwm_free()
  functions can be migrated to the new pwm_get() and pwm_put()
  functions.  Once this has been completed, the legacy API and the
  compatibility code in the core can be removed.

  In addition to the above, these changes also add support for
  configuring the polarity of a PWM signal (currently only supported on
  ECAP and EHRPWM) and include a much needed rework of the i.MX driver.
  Managed functions to obtain and release a PWM device (devm_pwm_get()
  and devm_pwm_put()) have been added and the pwm-backlight driver has
  been updated to use them.  If the PWM subsystem hasn't been enabled,
  dummy functions are provided that allow the subsystem to safely
  compile out.

  Some common checks on input parameters have been moved to the core and
  removed from the drivers.  Finally, a small fix corrects the
  description of the PWM specifier's second cell in the device tree
  representation."

* tag 'for-3.7-rc1' of git://gitorious.org/linux-pwm/linux-pwm: (23 commits)
  pwm: dt: Fix description of second PWM cell
  pwm: Check for negative duty-cycle and period
  pwm: Add Ingenic JZ4740 support
  MIPS: JZ4740: Export timer API
  pwm: Move PUV3 PWM driver to PWM framework
  unicore32: pwm: Use managed resource allocations
  unicore32: pwm: Remove unnecessary indirection
  unicore32: pwm: Use module_platform_driver()
  unicore32: pwm: Properly remap memory-mapped registers
  pwm-backlight: Use devm_pwm_get() instead of pwm_get()
  pwm: Move AB8500 PWM driver to PWM framework
  pwm: Fix compilation error when CONFIG_PWM is not defined
  pwm: i.MX: fix clock lookup
  pwm: i.MX: use per clock unconditionally
  pwm: i.MX: add devicetree support
  pwm: i.MX: Use module_platform_driver
  pwm: i.MX: add functions to enable/disable pwm.
  pwm: i.MX: remove unnecessary if in pwm_[en|dis]able
  pwm: i.MX: factor out SoC specific functions
  pwm: pwm-tiehrpwm: Add support for configuring polarity of PWM
  ...

1 files changed, 221 insertions, 0 deletions

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
new file mode 100644
index 00000000000..10250fcefb9
--- /dev/null
+++ b/drivers/pwm/pwm-jz4740.c
@@ -0,0 +1,221 @@
+/*
+ *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ *  JZ4740 platform PWM support
+ *
+ *  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;  either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+
+#include <asm/mach-jz4740/gpio.h>
+#include <asm/mach-jz4740/timer.h>
+
+#define NUM_PWM 8
+
+static const unsigned int jz4740_pwm_gpio_list[NUM_PWM] = {
+	JZ_GPIO_PWM0,
+	JZ_GPIO_PWM1,
+	JZ_GPIO_PWM2,
+	JZ_GPIO_PWM3,
+	JZ_GPIO_PWM4,
+	JZ_GPIO_PWM5,
+	JZ_GPIO_PWM6,
+	JZ_GPIO_PWM7,
+};
+
+struct jz4740_pwm_chip {
+	struct pwm_chip chip;
+	struct clk *clk;
+};
+
+static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
+{
+	return container_of(chip, struct jz4740_pwm_chip, chip);
+}
+
+static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	unsigned int gpio = jz4740_pwm_gpio_list[pwm->hwpwm];
+	int ret;
+
+	/*
+	 * Timers 0 and 1 are used for system tasks, so they are unavailable
+	 * for use as PWMs.
+	 */
+	if (pwm->hwpwm < 2)
+		return -EBUSY;
+
+	ret = gpio_request(gpio, pwm->label);
+	if (ret) {
+		dev_err(chip->dev, "Failed to request GPIO#%u for PWM: %d\n",
+			gpio, ret);
+		return ret;
+	}
+
+	jz_gpio_set_function(gpio, JZ_GPIO_FUNC_PWM);
+
+	jz4740_timer_start(pwm->hwpwm);
+
+	return 0;
+}
+
+static void jz4740_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	unsigned int gpio = jz4740_pwm_gpio_list[pwm->hwpwm];
+
+	jz4740_timer_set_ctrl(pwm->hwpwm, 0);
+
+	jz_gpio_set_function(gpio, JZ_GPIO_FUNC_NONE);
+	gpio_free(gpio);
+
+	jz4740_timer_stop(pwm->hwpwm);
+}
+
+static int jz4740_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm);
+
+	ctrl |= JZ_TIMER_CTRL_PWM_ENABLE;
+	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
+	jz4740_timer_enable(pwm->hwpwm);
+
+	return 0;
+}
+
+static void jz4740_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	uint32_t ctrl = jz4740_timer_get_ctrl(pwm->hwpwm);
+
+	ctrl &= ~JZ_TIMER_CTRL_PWM_ENABLE;
+	jz4740_timer_disable(pwm->hwpwm);
+	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
+}
+
+static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+			     int duty_ns, int period_ns)
+{
+	struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip);
+	unsigned long long tmp;
+	unsigned long period, duty;
+	unsigned int prescaler = 0;
+	uint16_t ctrl;
+	bool is_enabled;
+
+	tmp = (unsigned long long)clk_get_rate(jz4740->clk) * period_ns;
+	do_div(tmp, 1000000000);
+	period = tmp;
+
+	while (period > 0xffff && prescaler < 6) {
+		period >>= 2;
+		++prescaler;
+	}
+
+	if (prescaler == 6)
+		return -EINVAL;
+
+	tmp = (unsigned long long)period * duty_ns;
+	do_div(tmp, period_ns);
+	duty = period - tmp;
+
+	if (duty >= period)
+		duty = period - 1;
+
+	is_enabled = jz4740_timer_is_enabled(pwm->hwpwm);
+	if (is_enabled)
+		jz4740_pwm_disable(chip, pwm);
+
+	jz4740_timer_set_count(pwm->hwpwm, 0);
+	jz4740_timer_set_duty(pwm->hwpwm, duty);
+	jz4740_timer_set_period(pwm->hwpwm, period);
+
+	ctrl = JZ_TIMER_CTRL_PRESCALER(prescaler) | JZ_TIMER_CTRL_SRC_EXT |
+		JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN;
+
+	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
+
+	if (is_enabled)
+		jz4740_pwm_enable(chip, pwm);
+
+	return 0;
+}
+
+static const struct pwm_ops jz4740_pwm_ops = {
+	.request = jz4740_pwm_request,
+	.free = jz4740_pwm_free,
+	.config = jz4740_pwm_config,
+	.enable = jz4740_pwm_enable,
+	.disable = jz4740_pwm_disable,
+	.owner = THIS_MODULE,
+};
+
+static int __devinit jz4740_pwm_probe(struct platform_device *pdev)
+{
+	struct jz4740_pwm_chip *jz4740;
+	int ret;
+
+	jz4740 = devm_kzalloc(&pdev->dev, sizeof(*jz4740), GFP_KERNEL);
+	if (!jz4740)
+		return -ENOMEM;
+
+	jz4740->clk = clk_get(NULL, "ext");
+	if (IS_ERR(jz4740->clk))
+		return PTR_ERR(jz4740->clk);
+
+	jz4740->chip.dev = &pdev->dev;
+	jz4740->chip.ops = &jz4740_pwm_ops;
+	jz4740->chip.npwm = NUM_PWM;
+	jz4740->chip.base = -1;
+
+	ret = pwmchip_add(&jz4740->chip);
+	if (ret < 0) {
+		clk_put(jz4740->clk);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, jz4740);
+
+	return 0;
+}
+
+static int __devexit jz4740_pwm_remove(struct platform_device *pdev)
+{
+	struct jz4740_pwm_chip *jz4740 = platform_get_drvdata(pdev);
+	int ret;
+
+	ret = pwmchip_remove(&jz4740->chip);
+	if (ret < 0)
+		return ret;
+
+	clk_put(jz4740->clk);
+
+	return 0;
+}
+
+static struct platform_driver jz4740_pwm_driver = {
+	.driver = {
+		.name = "jz4740-pwm",
+		.owner = THIS_MODULE,
+	},
+	.probe = jz4740_pwm_probe,
+	.remove = __devexit_p(jz4740_pwm_remove),
+};
+module_platform_driver(jz4740_pwm_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("Ingenic JZ4740 PWM driver");
+MODULE_ALIAS("platform:jz4740-pwm");
+MODULE_LICENSE("GPL");