pwm: Remove superseded pwm-samsung-legacy driver
This patch removes the now unused pwm-samsung-legacy driver, which was replaced by new pwm-samsung driver. Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Mark Brown <broonie@linaro.org> Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Tomasz Figa
Родитель
7fa33bdb4c
Коммит
6059235c51
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@ -11,7 +11,6 @@ obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o
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obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o
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obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
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obj-$(CONFIG_PWM_RENESAS_TPU) += pwm-renesas-tpu.o
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obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung-legacy.o
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obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o
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obj-$(CONFIG_PWM_SPEAR) += pwm-spear.o
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obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
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@ -1,353 +0,0 @@
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/* drivers/pwm/pwm-samsung.c
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*
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* Copyright (c) 2007 Ben Dooks
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* Copyright (c) 2008 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
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*
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* S3C series PWM device core
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*/
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#define pr_fmt(fmt) "pwm-samsung: " fmt
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/pwm.h>
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#include <mach/map.h>
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#include <plat/regs-timer.h>
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struct s3c_chip {
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struct platform_device *pdev;
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struct clk *clk_div;
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struct clk *clk;
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const char *label;
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unsigned int period_ns;
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unsigned int duty_ns;
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unsigned char tcon_base;
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unsigned char pwm_id;
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struct pwm_chip chip;
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};
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#define to_s3c_chip(chip) container_of(chip, struct s3c_chip, chip)
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#define pwm_dbg(_pwm, msg...) dev_dbg(&(_pwm)->pdev->dev, msg)
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static struct clk *clk_scaler[2];
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static inline int pwm_is_tdiv(struct s3c_chip *chip)
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{
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return clk_get_parent(chip->clk) == chip->clk_div;
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}
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#define pwm_tcon_start(pwm) (1 << (pwm->tcon_base + 0))
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#define pwm_tcon_invert(pwm) (1 << (pwm->tcon_base + 2))
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#define pwm_tcon_autoreload(pwm) (1 << (pwm->tcon_base + 3))
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#define pwm_tcon_manulupdate(pwm) (1 << (pwm->tcon_base + 1))
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static int s3c_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct s3c_chip *s3c = to_s3c_chip(chip);
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unsigned long flags;
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unsigned long tcon;
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local_irq_save(flags);
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tcon = __raw_readl(S3C2410_TCON);
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tcon |= pwm_tcon_start(s3c);
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__raw_writel(tcon, S3C2410_TCON);
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local_irq_restore(flags);
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return 0;
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}
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static void s3c_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct s3c_chip *s3c = to_s3c_chip(chip);
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unsigned long flags;
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unsigned long tcon;
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local_irq_save(flags);
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tcon = __raw_readl(S3C2410_TCON);
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tcon &= ~pwm_tcon_start(s3c);
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__raw_writel(tcon, S3C2410_TCON);
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local_irq_restore(flags);
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}
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static unsigned long pwm_calc_tin(struct s3c_chip *s3c, unsigned long freq)
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{
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unsigned long tin_parent_rate;
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unsigned int div;
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tin_parent_rate = clk_get_rate(clk_get_parent(s3c->clk_div));
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pwm_dbg(s3c, "tin parent at %lu\n", tin_parent_rate);
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for (div = 2; div <= 16; div *= 2) {
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if ((tin_parent_rate / (div << 16)) < freq)
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return tin_parent_rate / div;
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}
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return tin_parent_rate / 16;
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}
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#define NS_IN_HZ (1000000000UL)
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static int s3c_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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int duty_ns, int period_ns)
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{
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struct s3c_chip *s3c = to_s3c_chip(chip);
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unsigned long tin_rate;
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unsigned long tin_ns;
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unsigned long period;
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unsigned long flags;
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unsigned long tcon;
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unsigned long tcnt;
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long tcmp;
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/* We currently avoid using 64bit arithmetic by using the
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* fact that anything faster than 1Hz is easily representable
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* by 32bits. */
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if (period_ns > NS_IN_HZ || duty_ns > NS_IN_HZ)
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return -ERANGE;
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if (period_ns == s3c->period_ns &&
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duty_ns == s3c->duty_ns)
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return 0;
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/* The TCMP and TCNT can be read without a lock, they're not
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* shared between the timers. */
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tcmp = __raw_readl(S3C2410_TCMPB(s3c->pwm_id));
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tcnt = __raw_readl(S3C2410_TCNTB(s3c->pwm_id));
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period = NS_IN_HZ / period_ns;
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pwm_dbg(s3c, "duty_ns=%d, period_ns=%d (%lu)\n",
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duty_ns, period_ns, period);
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/* Check to see if we are changing the clock rate of the PWM */
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if (s3c->period_ns != period_ns) {
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if (pwm_is_tdiv(s3c)) {
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tin_rate = pwm_calc_tin(s3c, period);
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clk_set_rate(s3c->clk_div, tin_rate);
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} else
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tin_rate = clk_get_rate(s3c->clk);
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s3c->period_ns = period_ns;
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pwm_dbg(s3c, "tin_rate=%lu\n", tin_rate);
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tin_ns = NS_IN_HZ / tin_rate;
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tcnt = period_ns / tin_ns;
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} else
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tin_ns = NS_IN_HZ / clk_get_rate(s3c->clk);
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/* Note, counters count down */
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tcmp = duty_ns / tin_ns;
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tcmp = tcnt - tcmp;
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/* the pwm hw only checks the compare register after a decrement,
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so the pin never toggles if tcmp = tcnt */
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if (tcmp == tcnt)
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tcmp--;
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pwm_dbg(s3c, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);
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if (tcmp < 0)
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tcmp = 0;
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/* Update the PWM register block. */
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local_irq_save(flags);
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__raw_writel(tcmp, S3C2410_TCMPB(s3c->pwm_id));
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__raw_writel(tcnt, S3C2410_TCNTB(s3c->pwm_id));
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tcon = __raw_readl(S3C2410_TCON);
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tcon |= pwm_tcon_manulupdate(s3c);
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tcon |= pwm_tcon_autoreload(s3c);
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__raw_writel(tcon, S3C2410_TCON);
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tcon &= ~pwm_tcon_manulupdate(s3c);
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__raw_writel(tcon, S3C2410_TCON);
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local_irq_restore(flags);
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return 0;
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}
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static struct pwm_ops s3c_pwm_ops = {
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.enable = s3c_pwm_enable,
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.disable = s3c_pwm_disable,
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.config = s3c_pwm_config,
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.owner = THIS_MODULE,
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};
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static int s3c_pwm_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct s3c_chip *s3c;
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unsigned long flags;
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unsigned long tcon;
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unsigned int id = pdev->id;
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int ret;
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if (id == 4) {
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dev_err(dev, "TIMER4 is currently not supported\n");
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return -ENXIO;
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}
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s3c = devm_kzalloc(&pdev->dev, sizeof(*s3c), GFP_KERNEL);
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if (s3c == NULL) {
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dev_err(dev, "failed to allocate pwm_device\n");
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return -ENOMEM;
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}
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/* calculate base of control bits in TCON */
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s3c->tcon_base = id == 0 ? 0 : (id * 4) + 4;
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s3c->pwm_id = id;
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s3c->chip.dev = &pdev->dev;
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s3c->chip.ops = &s3c_pwm_ops;
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s3c->chip.base = -1;
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s3c->chip.npwm = 1;
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s3c->clk = devm_clk_get(dev, "pwm-tin");
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if (IS_ERR(s3c->clk)) {
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dev_err(dev, "failed to get pwm tin clk\n");
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return PTR_ERR(s3c->clk);
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}
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s3c->clk_div = devm_clk_get(dev, "pwm-tdiv");
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if (IS_ERR(s3c->clk_div)) {
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dev_err(dev, "failed to get pwm tdiv clk\n");
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return PTR_ERR(s3c->clk_div);
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}
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clk_enable(s3c->clk);
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clk_enable(s3c->clk_div);
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local_irq_save(flags);
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tcon = __raw_readl(S3C2410_TCON);
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tcon |= pwm_tcon_invert(s3c);
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__raw_writel(tcon, S3C2410_TCON);
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local_irq_restore(flags);
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ret = pwmchip_add(&s3c->chip);
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if (ret < 0) {
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dev_err(dev, "failed to register pwm\n");
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goto err_clk_tdiv;
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}
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pwm_dbg(s3c, "config bits %02x\n",
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(__raw_readl(S3C2410_TCON) >> s3c->tcon_base) & 0x0f);
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dev_info(dev, "tin at %lu, tdiv at %lu, tin=%sclk, base %d\n",
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clk_get_rate(s3c->clk),
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clk_get_rate(s3c->clk_div),
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pwm_is_tdiv(s3c) ? "div" : "ext", s3c->tcon_base);
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platform_set_drvdata(pdev, s3c);
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return 0;
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err_clk_tdiv:
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clk_disable(s3c->clk_div);
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clk_disable(s3c->clk);
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return ret;
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}
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static int s3c_pwm_remove(struct platform_device *pdev)
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{
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struct s3c_chip *s3c = platform_get_drvdata(pdev);
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int err;
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err = pwmchip_remove(&s3c->chip);
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if (err < 0)
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return err;
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clk_disable(s3c->clk_div);
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clk_disable(s3c->clk);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int s3c_pwm_suspend(struct device *dev)
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{
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struct s3c_chip *s3c = dev_get_drvdata(dev);
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/* No one preserve these values during suspend so reset them
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* Otherwise driver leaves PWM unconfigured if same values
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* passed to pwm_config
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*/
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s3c->period_ns = 0;
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s3c->duty_ns = 0;
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return 0;
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}
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static int s3c_pwm_resume(struct device *dev)
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{
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struct s3c_chip *s3c = dev_get_drvdata(dev);
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unsigned long tcon;
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/* Restore invertion */
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tcon = __raw_readl(S3C2410_TCON);
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tcon |= pwm_tcon_invert(s3c);
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__raw_writel(tcon, S3C2410_TCON);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(s3c_pwm_pm_ops, s3c_pwm_suspend,
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s3c_pwm_resume);
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static struct platform_driver s3c_pwm_driver = {
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.driver = {
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.name = "s3c24xx-pwm",
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.owner = THIS_MODULE,
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.pm = &s3c_pwm_pm_ops,
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},
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.probe = s3c_pwm_probe,
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.remove = s3c_pwm_remove,
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};
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static int __init pwm_init(void)
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{
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int ret;
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clk_scaler[0] = clk_get(NULL, "pwm-scaler0");
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clk_scaler[1] = clk_get(NULL, "pwm-scaler1");
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if (IS_ERR(clk_scaler[0]) || IS_ERR(clk_scaler[1])) {
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pr_err("failed to get scaler clocks\n");
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return -EINVAL;
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}
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ret = platform_driver_register(&s3c_pwm_driver);
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if (ret)
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pr_err("failed to add pwm driver\n");
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return ret;
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}
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arch_initcall(pwm_init);
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