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Commit 79c11b6f authored by Thierry Reding's avatar Thierry Reding
Browse files

pwm: Move PUV3 PWM driver to PWM framework 



This commit moves the driver to drivers/pwm and converts it to the new
PWM framework.

Signed-off-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
Tested-by: default avatarQin Rui <qinrui@mprc.pku.edu.cn>
Acked-by: default avatarGuan Xuetao <gxt@mprc.pku.edu.cn>
parent 5384e273

arch/unicore32/Kconfig

+2 −10
Original line number Diff line number Diff line
@@ -20,9 +20,6 @@ config UNICORE32 
	  designs licensed by PKUnity Ltd.

	  Please see web page at <http://www.pkunity.com/>.



config HAVE_PWM

	bool



config GENERIC_GPIO

	def_bool y
@@ -105,7 +102,8 @@ config PUV3_DB0913 


config PUV3_NB0916

	bool "NetBook board (0916)"

	select HAVE_PWM

	select PWM

	select PWM_PUV3



config PUV3_SMW0919

	bool "Security Mini-Workstation board (0919)"
@@ -219,12 +217,6 @@ config PUV3_GPIO 
	select GPIO_SYSFS if EXPERIMENTAL

	default y



config PUV3_PWM

	tristate

	default BACKLIGHT_PWM

	help

	  Enable support for NB0916 PWM controllers



if PUV3_NB0916



menu "PKUnity NetBook-0916 Features"

arch/unicore32/kernel/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -16,7 +16,6 @@ obj-$(CONFIG_UNICORE_FPU_F64) += fpu-ucf64.o 
obj-$(CONFIG_ARCH_PUV3)		+= clock.o irq.o time.o



obj-$(CONFIG_PUV3_GPIO)		+= gpio.o

obj-$(CONFIG_PUV3_PWM)		+= pwm.o

obj-$(CONFIG_PUV3_PM)		+= pm.o sleep.o

obj-$(CONFIG_HIBERNATION)	+= hibernate.o hibernate_asm.o

drivers/pwm/Kconfig

+10 −1
Original line number Diff line number Diff line 
menuconfig PWM

	bool "Pulse-Width Modulation (PWM) Support"

	depends on !MACH_JZ4740 && !PUV3_PWM

	depends on !MACH_JZ4740

	help

	  Generic Pulse-Width Modulation (PWM) support.
@@ -76,6 +76,15 @@ config PWM_MXS 
	  To compile this driver as a module, choose M here: the module

	  will be called pwm-mxs.



config PWM_PUV3

	tristate "PKUnity NetBook-0916 PWM support"

	depends on ARCH_PUV3

	help

	  Generic PWM framework driver for PKUnity NetBook-0916.



	  To compile this driver as a module, choose M here: the module

	  will be called pwm-puv3.



config PWM_PXA

	tristate "PXA PWM support"

	depends on ARCH_PXA

drivers/pwm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o 
obj-$(CONFIG_PWM_IMX)		+= pwm-imx.o

obj-$(CONFIG_PWM_LPC32XX)	+= pwm-lpc32xx.o

obj-$(CONFIG_PWM_MXS)		+= pwm-mxs.o

obj-$(CONFIG_PWM_PUV3)		+= pwm-puv3.o

obj-$(CONFIG_PWM_PXA)		+= pwm-pxa.o

obj-$(CONFIG_PWM_SAMSUNG)	+= pwm-samsung.o

obj-$(CONFIG_PWM_TEGRA)		+= pwm-tegra.o

arch/unicore32/kernel/pwm.c→drivers/pwm/pwm-puv3.c

+161 −0
Original line number Diff line number Diff line
@@ -23,39 +23,37 @@ 
#include <asm/div64.h>

#include <mach/hardware.h>



struct pwm_device {

	struct list_head	node;

	struct platform_device *pdev;



struct puv3_pwm_chip {

	struct pwm_chip chip;

	void __iomem *base;



	const char	*label;

	struct clk *clk;

	int		clk_enabled;



	unsigned int	use_count;

	unsigned int	pwm_id;

	bool enabled;

};



static inline struct puv3_pwm_chip *to_puv3(struct pwm_chip *chip)

{

	return container_of(chip, struct puv3_pwm_chip, chip);

}



/*

 * period_ns = 10^9 * (PRESCALE + 1) * (PV + 1) / PWM_CLK_RATE

 * duty_ns   = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE

 */

int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)

static int puv3_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,

			   int duty_ns, int period_ns)

{

	unsigned long long c;

	unsigned long period_cycles, prescale, pv, dc;

	struct puv3_pwm_chip *puv3 = to_puv3(chip);

	unsigned long long c;



	if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)

		return -EINVAL;



	c = clk_get_rate(pwm->clk);

	c = clk_get_rate(puv3->clk);

	c = c * period_ns;

	do_div(c, 1000000000);

	period_cycles = c;



	if (period_cycles < 1)

		period_cycles = 1;



	prescale = (period_cycles - 1) / 1024;

	pv = period_cycles / (prescale + 1) - 1;
@@ -67,115 +65,57 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) 
	else

		dc = (pv + 1) * duty_ns / period_ns;



	/* NOTE: the clock to PWM has to be enabled first

	/*

	 * NOTE: the clock to PWM has to be enabled first

	 * before writing to the registers

	 */

	clk_enable(pwm->clk);

	clk_prepare_enable(puv3->clk);



	writel(prescale, pwm->base + OST_PWM_PWCR);

	writel(pv - dc, pwm->base + OST_PWM_DCCR);

	writel(pv, pwm->base + OST_PWM_PCR);

	writel(prescale, puv3->base + OST_PWM_PWCR);

	writel(pv - dc, puv3->base + OST_PWM_DCCR);

	writel(pv, puv3->base + OST_PWM_PCR);



	clk_disable(pwm->clk);

	clk_disable_unprepare(puv3->clk);



	return 0;

}

EXPORT_SYMBOL(pwm_config);



int pwm_enable(struct pwm_device *pwm)

static int puv3_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)

{

	int rc = 0;



	if (!pwm->clk_enabled) {

		rc = clk_enable(pwm->clk);

		if (!rc)

			pwm->clk_enabled = 1;

	}

	return rc;

}

EXPORT_SYMBOL(pwm_enable);

	struct puv3_pwm_chip *puv3 = to_puv3(chip);



void pwm_disable(struct pwm_device *pwm)

{

	if (pwm->clk_enabled) {

		clk_disable(pwm->clk);

		pwm->clk_enabled = 0;

	}

	return clk_prepare_enable(puv3->clk);

}

EXPORT_SYMBOL(pwm_disable);



static DEFINE_MUTEX(pwm_lock);

static LIST_HEAD(pwm_list);



struct pwm_device *pwm_request(int pwm_id, const char *label)

static void puv3_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)

{

	struct pwm_device *pwm;

	int found = 0;

	struct puv3_pwm_chip *puv3 = to_puv3(chip);



	mutex_lock(&pwm_lock);



	list_for_each_entry(pwm, &pwm_list, node) {

		if (pwm->pwm_id == pwm_id) {

			found = 1;

			break;

		}

	clk_disable_unprepare(puv3->clk);

}



	if (found) {

		if (pwm->use_count == 0) {

			pwm->use_count++;

			pwm->label = label;

		} else

			pwm = ERR_PTR(-EBUSY);

	} else

		pwm = ERR_PTR(-ENOENT);



	mutex_unlock(&pwm_lock);

	return pwm;

}

EXPORT_SYMBOL(pwm_request);



void pwm_free(struct pwm_device *pwm)

{

	mutex_lock(&pwm_lock);



	if (pwm->use_count) {

		pwm->use_count--;

		pwm->label = NULL;

	} else

		pr_warning("PWM device already freed\n");



	mutex_unlock(&pwm_lock);

}

EXPORT_SYMBOL(pwm_free);



static inline void __add_pwm(struct pwm_device *pwm)

{

	mutex_lock(&pwm_lock);

	list_add_tail(&pwm->node, &pwm_list);

	mutex_unlock(&pwm_lock);

}

static const struct pwm_ops puv3_pwm_ops = {

	.config = puv3_pwm_config,

	.enable = puv3_pwm_enable,

	.disable = puv3_pwm_disable,

	.owner = THIS_MODULE,

};



static int __devinit pwm_probe(struct platform_device *pdev)

{

	struct pwm_device *pwm;

	struct puv3_pwm_chip *puv3;

	struct resource *r;

	int ret;



	pwm = devm_kzalloc(&pdev->dev, sizeof(struct pwm_device), GFP_KERNEL);

	if (pwm == NULL) {

	puv3 = devm_kzalloc(&pdev->dev, sizeof(*puv3), GFP_KERNEL);

	if (puv3 == NULL) {

		dev_err(&pdev->dev, "failed to allocate memory\n");

		return -ENOMEM;

	}



	pwm->clk = devm_clk_get(&pdev->dev, "OST_CLK");

	if (IS_ERR(pwm->clk))

		return PTR_ERR(pwm->clk);



	pwm->clk_enabled = 0;



	pwm->use_count = 0;

	pwm->pwm_id = pdev->id;

	pwm->pdev = pdev;

	puv3->clk = devm_clk_get(&pdev->dev, "OST_CLK");

	if (IS_ERR(puv3->clk))

		return PTR_ERR(puv3->clk);



	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (r == NULL) {
@@ -183,28 +123,30 @@ static int __devinit pwm_probe(struct platform_device *pdev) 
		return -ENODEV;

	}



	pwm->base = devm_request_and_ioremap(&pdev->dev, r);

	if (pwm->base == NULL)

	puv3->base = devm_request_and_ioremap(&pdev->dev, r);

	if (puv3->base == NULL)

		return -EADDRNOTAVAIL;



	__add_pwm(pwm);

	platform_set_drvdata(pdev, pwm);

	puv3->chip.dev = &pdev->dev;

	puv3->chip.ops = &puv3_pwm_ops;

	puv3->chip.base = -1;

	puv3->chip.npwm = 1;



	ret = pwmchip_add(&puv3->chip);

	if (ret < 0) {

		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);

		return ret;

	}



	platform_set_drvdata(pdev, puv3);

	return 0;

}



static int __devexit pwm_remove(struct platform_device *pdev)

{

	struct pwm_device *pwm;

	struct puv3_pwm_chip *puv3 = platform_get_drvdata(pdev);



	pwm = platform_get_drvdata(pdev);

	if (pwm == NULL)

		return -ENODEV;



	mutex_lock(&pwm_lock);

	list_del(&pwm->node);

	mutex_unlock(&pwm_lock);



	return 0;

	return pwmchip_remove(&puv3->chip);

}



static struct platform_driver puv3_pwm_driver = {