pwm: Remove superseded pwm-samsung-legacy driver

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

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

obj-$(CONFIG_PWM_RENESAS_TPU)	+= pwm-renesas-tpu.o

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

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

obj-$(CONFIG_PWM_SPEAR)		+= pwm-spear.o

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

/* drivers/pwm/pwm-samsung.c

 *

 * Copyright (c) 2007 Ben Dooks

 * Copyright (c) 2008 Simtec Electronics

 *	Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>

 *

 * S3C series PWM device core

 *

 * 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.

*/

#define pr_fmt(fmt) "pwm-samsung: " fmt

#include <linux/export.h>

#include <linux/kernel.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/err.h>

#include <linux/clk.h>

#include <linux/io.h>

#include <linux/pwm.h>

#include <mach/map.h>

#include <plat/regs-timer.h>

struct s3c_chip {

	struct platform_device	*pdev;

	struct clk		*clk_div;

	struct clk		*clk;

	const char		*label;

	unsigned int		 period_ns;

	unsigned int		 duty_ns;

	unsigned char		 tcon_base;

	unsigned char		 pwm_id;

	struct pwm_chip		 chip;

};

#define to_s3c_chip(chip)	container_of(chip, struct s3c_chip, chip)

#define pwm_dbg(_pwm, msg...) dev_dbg(&(_pwm)->pdev->dev, msg)

static struct clk *clk_scaler[2];

static inline int pwm_is_tdiv(struct s3c_chip *chip)

{

	return clk_get_parent(chip->clk) == chip->clk_div;

}

#define pwm_tcon_start(pwm) (1 << (pwm->tcon_base + 0))

#define pwm_tcon_invert(pwm) (1 << (pwm->tcon_base + 2))

#define pwm_tcon_autoreload(pwm) (1 << (pwm->tcon_base + 3))

#define pwm_tcon_manulupdate(pwm) (1 << (pwm->tcon_base + 1))

static int s3c_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)

{

	struct s3c_chip *s3c = to_s3c_chip(chip);

	unsigned long flags;

	unsigned long tcon;

	local_irq_save(flags);

	tcon = __raw_readl(S3C2410_TCON);

	tcon |= pwm_tcon_start(s3c);

	__raw_writel(tcon, S3C2410_TCON);

	local_irq_restore(flags);

	return 0;

}

static void s3c_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)

{

	struct s3c_chip *s3c = to_s3c_chip(chip);

	unsigned long flags;

	unsigned long tcon;

	local_irq_save(flags);

	tcon = __raw_readl(S3C2410_TCON);

	tcon &= ~pwm_tcon_start(s3c);

	__raw_writel(tcon, S3C2410_TCON);

	local_irq_restore(flags);

}

static unsigned long pwm_calc_tin(struct s3c_chip *s3c, unsigned long freq)

{

	unsigned long tin_parent_rate;

	unsigned int div;

	tin_parent_rate = clk_get_rate(clk_get_parent(s3c->clk_div));

	pwm_dbg(s3c, "tin parent at %lu\n", tin_parent_rate);

	for (div = 2; div <= 16; div *= 2) {

		if ((tin_parent_rate / (div << 16)) < freq)

			return tin_parent_rate / div;

	}

	return tin_parent_rate / 16;

}

#define NS_IN_HZ (1000000000UL)

static int s3c_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,

		int duty_ns, int period_ns)

{

	struct s3c_chip *s3c = to_s3c_chip(chip);

	unsigned long tin_rate;

	unsigned long tin_ns;

	unsigned long period;

	unsigned long flags;

	unsigned long tcon;

	unsigned long tcnt;

	long tcmp;

	/* We currently avoid using 64bit arithmetic by using the

	 * fact that anything faster than 1Hz is easily representable

	 * by 32bits. */

	if (period_ns > NS_IN_HZ || duty_ns > NS_IN_HZ)

		return -ERANGE;

	if (period_ns == s3c->period_ns &&

	    duty_ns == s3c->duty_ns)

		return 0;

	/* The TCMP and TCNT can be read without a lock, they're not

	 * shared between the timers. */

	tcmp = __raw_readl(S3C2410_TCMPB(s3c->pwm_id));

	tcnt = __raw_readl(S3C2410_TCNTB(s3c->pwm_id));

	period = NS_IN_HZ / period_ns;

	pwm_dbg(s3c, "duty_ns=%d, period_ns=%d (%lu)\n",

		duty_ns, period_ns, period);

	/* Check to see if we are changing the clock rate of the PWM */

	if (s3c->period_ns != period_ns) {

		if (pwm_is_tdiv(s3c)) {

			tin_rate = pwm_calc_tin(s3c, period);

			clk_set_rate(s3c->clk_div, tin_rate);

		} else

			tin_rate = clk_get_rate(s3c->clk);

		s3c->period_ns = period_ns;

		pwm_dbg(s3c, "tin_rate=%lu\n", tin_rate);

		tin_ns = NS_IN_HZ / tin_rate;

		tcnt = period_ns / tin_ns;

	} else

		tin_ns = NS_IN_HZ / clk_get_rate(s3c->clk);

	/* Note, counters count down */

	tcmp = duty_ns / tin_ns;

	tcmp = tcnt - tcmp;

	/* the pwm hw only checks the compare register after a decrement,

	   so the pin never toggles if tcmp = tcnt */

	if (tcmp == tcnt)

		tcmp--;

	pwm_dbg(s3c, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);

	if (tcmp < 0)

		tcmp = 0;

	/* Update the PWM register block. */

	local_irq_save(flags);

	__raw_writel(tcmp, S3C2410_TCMPB(s3c->pwm_id));

	__raw_writel(tcnt, S3C2410_TCNTB(s3c->pwm_id));

	tcon = __raw_readl(S3C2410_TCON);

	tcon |= pwm_tcon_manulupdate(s3c);

	tcon |= pwm_tcon_autoreload(s3c);

	__raw_writel(tcon, S3C2410_TCON);

	tcon &= ~pwm_tcon_manulupdate(s3c);

	__raw_writel(tcon, S3C2410_TCON);

	local_irq_restore(flags);

	return 0;

}

static struct pwm_ops s3c_pwm_ops = {

	.enable = s3c_pwm_enable,

	.disable = s3c_pwm_disable,

	.config = s3c_pwm_config,

	.owner = THIS_MODULE,

};

static int s3c_pwm_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct s3c_chip *s3c;

	unsigned long flags;

	unsigned long tcon;

	unsigned int id = pdev->id;

	int ret;

	if (id == 4) {

		dev_err(dev, "TIMER4 is currently not supported\n");

		return -ENXIO;

	}

	s3c = devm_kzalloc(&pdev->dev, sizeof(*s3c), GFP_KERNEL);

	if (s3c == NULL) {

		dev_err(dev, "failed to allocate pwm_device\n");

		return -ENOMEM;

	}

	/* calculate base of control bits in TCON */

	s3c->tcon_base = id == 0 ? 0 : (id * 4) + 4;

	s3c->pwm_id = id;

	s3c->chip.dev = &pdev->dev;

	s3c->chip.ops = &s3c_pwm_ops;

	s3c->chip.base = -1;

	s3c->chip.npwm = 1;

	s3c->clk = devm_clk_get(dev, "pwm-tin");

	if (IS_ERR(s3c->clk)) {

		dev_err(dev, "failed to get pwm tin clk\n");

		return PTR_ERR(s3c->clk);

	}

	s3c->clk_div = devm_clk_get(dev, "pwm-tdiv");

	if (IS_ERR(s3c->clk_div)) {

		dev_err(dev, "failed to get pwm tdiv clk\n");

		return PTR_ERR(s3c->clk_div);

	}

	clk_enable(s3c->clk);

	clk_enable(s3c->clk_div);

	local_irq_save(flags);

	tcon = __raw_readl(S3C2410_TCON);

	tcon |= pwm_tcon_invert(s3c);

	__raw_writel(tcon, S3C2410_TCON);

	local_irq_restore(flags);

	ret = pwmchip_add(&s3c->chip);

	if (ret < 0) {

		dev_err(dev, "failed to register pwm\n");

		goto err_clk_tdiv;

	}

	pwm_dbg(s3c, "config bits %02x\n",

		(__raw_readl(S3C2410_TCON) >> s3c->tcon_base) & 0x0f);

	dev_info(dev, "tin at %lu, tdiv at %lu, tin=%sclk, base %d\n",

		 clk_get_rate(s3c->clk),

		 clk_get_rate(s3c->clk_div),

		 pwm_is_tdiv(s3c) ? "div" : "ext", s3c->tcon_base);

	platform_set_drvdata(pdev, s3c);

	return 0;

 err_clk_tdiv:

	clk_disable(s3c->clk_div);

	clk_disable(s3c->clk);

	return ret;

}

static int s3c_pwm_remove(struct platform_device *pdev)

{

	struct s3c_chip *s3c = platform_get_drvdata(pdev);

	int err;

	err = pwmchip_remove(&s3c->chip);

	if (err < 0)

		return err;

	clk_disable(s3c->clk_div);

	clk_disable(s3c->clk);

	return 0;

}

#ifdef CONFIG_PM_SLEEP

static int s3c_pwm_suspend(struct device *dev)

{

	struct s3c_chip *s3c = dev_get_drvdata(dev);

	/* No one preserve these values during suspend so reset them

	 * Otherwise driver leaves PWM unconfigured if same values

	 * passed to pwm_config

	 */

	s3c->period_ns = 0;

	s3c->duty_ns = 0;

	return 0;

}

static int s3c_pwm_resume(struct device *dev)

{

	struct s3c_chip *s3c = dev_get_drvdata(dev);

	unsigned long tcon;

	/* Restore invertion */

	tcon = __raw_readl(S3C2410_TCON);

	tcon |= pwm_tcon_invert(s3c);

	__raw_writel(tcon, S3C2410_TCON);

	return 0;

}

#endif

static SIMPLE_DEV_PM_OPS(s3c_pwm_pm_ops, s3c_pwm_suspend,

			s3c_pwm_resume);

static struct platform_driver s3c_pwm_driver = {

	.driver		= {

		.name	= "s3c24xx-pwm",

		.owner	= THIS_MODULE,

		.pm	= &s3c_pwm_pm_ops,

	},

	.probe		= s3c_pwm_probe,

	.remove		= s3c_pwm_remove,

};

static int __init pwm_init(void)

{

	int ret;

	clk_scaler[0] = clk_get(NULL, "pwm-scaler0");

	clk_scaler[1] = clk_get(NULL, "pwm-scaler1");

	if (IS_ERR(clk_scaler[0]) || IS_ERR(clk_scaler[1])) {

		pr_err("failed to get scaler clocks\n");

		return -EINVAL;

	}

	ret = platform_driver_register(&s3c_pwm_driver);

	if (ret)

		pr_err("failed to add pwm driver\n");

	return ret;

}

arch_initcall(pwm_init);