From 2ed731429d4adf8de18e74d1e049c2f36633000e Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Tue, 21 Oct 2008 14:06:55 +0100 Subject: [ARM] S3C: Move pwm-clock.c to arch/arm/plat-s3c Move pwm-clock.c to arch/arm/plat-s3c to be shared with the S3C64XX implementations. Signed-off-by: Ben Dooks --- arch/arm/plat-s3c24xx/pwm-clock.c | 437 -------------------------------------- 1 file changed, 437 deletions(-) delete mode 100644 arch/arm/plat-s3c24xx/pwm-clock.c (limited to 'arch/arm/plat-s3c24xx/pwm-clock.c') diff --git a/arch/arm/plat-s3c24xx/pwm-clock.c b/arch/arm/plat-s3c24xx/pwm-clock.c deleted file mode 100644 index 3fad68a1e6b..00000000000 --- a/arch/arm/plat-s3c24xx/pwm-clock.c +++ /dev/null @@ -1,437 +0,0 @@ -/* linux/arch/arm/plat-s3c24xx/pwm-clock.c - * - * Copyright (c) 2007 Simtec Electronics - * Copyright (c) 2007, 2008 Ben Dooks - * Ben Dooks - * - * 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. -*/ - -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -#include -#include - -#include -#include - -#include - -/* Each of the timers 0 through 5 go through the following - * clock tree, with the inputs depending on the timers. - * - * pclk ---- [ prescaler 0 ] -+---> timer 0 - * +---> timer 1 - * - * pclk ---- [ prescaler 1 ] -+---> timer 2 - * +---> timer 3 - * \---> timer 4 - * - * Which are fed into the timers as so: - * - * prescaled 0 ---- [ div 2,4,8,16 ] ---\ - * [mux] -> timer 0 - * tclk 0 ------------------------------/ - * - * prescaled 0 ---- [ div 2,4,8,16 ] ---\ - * [mux] -> timer 1 - * tclk 0 ------------------------------/ - * - * - * prescaled 1 ---- [ div 2,4,8,16 ] ---\ - * [mux] -> timer 2 - * tclk 1 ------------------------------/ - * - * prescaled 1 ---- [ div 2,4,8,16 ] ---\ - * [mux] -> timer 3 - * tclk 1 ------------------------------/ - * - * prescaled 1 ---- [ div 2,4,8, 16 ] --\ - * [mux] -> timer 4 - * tclk 1 ------------------------------/ - * - * Since the mux and the divider are tied together in the - * same register space, it is impossible to set the parent - * and the rate at the same time. To avoid this, we add an - * intermediate 'prescaled-and-divided' clock to select - * as the parent for the timer input clock called tdiv. - * - * prescaled clk --> pwm-tdiv ---\ - * [ mux ] --> timer X - * tclk -------------------------/ -*/ - -static unsigned long clk_pwm_scaler_getrate(struct clk *clk) -{ - unsigned long tcfg0 = __raw_readl(S3C2410_TCFG0); - - if (clk->id == 1) { - tcfg0 &= S3C2410_TCFG_PRESCALER1_MASK; - tcfg0 >>= S3C2410_TCFG_PRESCALER1_SHIFT; - } else { - tcfg0 &= S3C2410_TCFG_PRESCALER0_MASK; - } - - return clk_get_rate(clk->parent) / (tcfg0 + 1); -} - -/* TODO - add set rate calls. */ - -static struct clk clk_timer_scaler[] = { - [0] = { - .name = "pwm-scaler0", - .id = -1, - .get_rate = clk_pwm_scaler_getrate, - }, - [1] = { - .name = "pwm-scaler1", - .id = -1, - .get_rate = clk_pwm_scaler_getrate, - }, -}; - -static struct clk clk_timer_tclk[] = { - [0] = { - .name = "pwm-tclk0", - .id = -1, - }, - [1] = { - .name = "pwm-tclk1", - .id = -1, - }, -}; - -struct pwm_tdiv_clk { - struct clk clk; - unsigned int divisor; -}; - -static inline struct pwm_tdiv_clk *to_tdiv(struct clk *clk) -{ - return container_of(clk, struct pwm_tdiv_clk, clk); -} - -static inline unsigned long tcfg_to_divisor(unsigned long tcfg1) -{ - return 1 << (1 + tcfg1); -} - -static unsigned long clk_pwm_tdiv_get_rate(struct clk *clk) -{ - unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1); - unsigned int divisor; - - tcfg1 >>= S3C2410_TCFG1_SHIFT(clk->id); - tcfg1 &= S3C2410_TCFG1_MUX_MASK; - - if (tcfg1 == S3C2410_TCFG1_MUX_TCLK) - divisor = to_tdiv(clk)->divisor; - else - divisor = tcfg_to_divisor(tcfg1); - - return clk_get_rate(clk->parent) / divisor; -} - -static unsigned long clk_pwm_tdiv_round_rate(struct clk *clk, - unsigned long rate) -{ - unsigned long parent_rate; - unsigned long divisor; - - parent_rate = clk_get_rate(clk->parent); - divisor = parent_rate / rate; - - if (divisor <= 2) - divisor = 2; - else if (divisor <= 4) - divisor = 4; - else if (divisor <= 8) - divisor = 8; - else - divisor = 16; - - return parent_rate / divisor; -} - -static unsigned long clk_pwm_tdiv_bits(struct pwm_tdiv_clk *divclk) -{ - unsigned long bits; - - switch (divclk->divisor) { - case 2: - bits = S3C2410_TCFG1_MUX_DIV2; - break; - case 4: - bits = S3C2410_TCFG1_MUX_DIV4; - break; - case 8: - bits = S3C2410_TCFG1_MUX_DIV8; - break; - case 16: - default: - bits = S3C2410_TCFG1_MUX_DIV16; - break; - } - - return bits; -} - -static void clk_pwm_tdiv_update(struct pwm_tdiv_clk *divclk) -{ - unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1); - unsigned long bits = clk_pwm_tdiv_bits(divclk); - unsigned long flags; - unsigned long shift = S3C2410_TCFG1_SHIFT(divclk->clk.id); - - local_irq_save(flags); - - tcfg1 = __raw_readl(S3C2410_TCFG1); - tcfg1 &= ~(S3C2410_TCFG1_MUX_MASK << shift); - tcfg1 |= bits << shift; - __raw_writel(tcfg1, S3C2410_TCFG1); - - local_irq_restore(flags); -} - -static int clk_pwm_tdiv_set_rate(struct clk *clk, unsigned long rate) -{ - struct pwm_tdiv_clk *divclk = to_tdiv(clk); - unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1); - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long divisor; - - tcfg1 >>= S3C2410_TCFG1_SHIFT(clk->id); - tcfg1 &= S3C2410_TCFG1_MUX_MASK; - - rate = clk_round_rate(clk, rate); - divisor = parent_rate / rate; - - if (divisor > 16) - return -EINVAL; - - divclk->divisor = divisor; - - /* Update the current MUX settings if we are currently - * selected as the clock source for this clock. */ - - if (tcfg1 != S3C2410_TCFG1_MUX_TCLK) - clk_pwm_tdiv_update(divclk); - - return 0; -} - -static struct pwm_tdiv_clk clk_timer_tdiv[] = { - [0] = { - .clk = { - .name = "pwm-tdiv", - .parent = &clk_timer_scaler[0], - .get_rate = clk_pwm_tdiv_get_rate, - .set_rate = clk_pwm_tdiv_set_rate, - .round_rate = clk_pwm_tdiv_round_rate, - }, - }, - [1] = { - .clk = { - .name = "pwm-tdiv", - .parent = &clk_timer_scaler[0], - .get_rate = clk_pwm_tdiv_get_rate, - .set_rate = clk_pwm_tdiv_set_rate, - .round_rate = clk_pwm_tdiv_round_rate, - } - }, - [2] = { - .clk = { - .name = "pwm-tdiv", - .parent = &clk_timer_scaler[1], - .get_rate = clk_pwm_tdiv_get_rate, - .set_rate = clk_pwm_tdiv_set_rate, - .round_rate = clk_pwm_tdiv_round_rate, - }, - }, - [3] = { - .clk = { - .name = "pwm-tdiv", - .parent = &clk_timer_scaler[1], - .get_rate = clk_pwm_tdiv_get_rate, - .set_rate = clk_pwm_tdiv_set_rate, - .round_rate = clk_pwm_tdiv_round_rate, - }, - }, - [4] = { - .clk = { - .name = "pwm-tdiv", - .parent = &clk_timer_scaler[1], - .get_rate = clk_pwm_tdiv_get_rate, - .set_rate = clk_pwm_tdiv_set_rate, - .round_rate = clk_pwm_tdiv_round_rate, - }, - }, -}; - -static int __init clk_pwm_tdiv_register(unsigned int id) -{ - struct pwm_tdiv_clk *divclk = &clk_timer_tdiv[id]; - unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1); - - tcfg1 >>= S3C2410_TCFG1_SHIFT(id); - tcfg1 &= S3C2410_TCFG1_MUX_MASK; - - divclk->clk.id = id; - divclk->divisor = tcfg_to_divisor(tcfg1); - - return s3c24xx_register_clock(&divclk->clk); -} - -static inline struct clk *s3c24xx_pwmclk_tclk(unsigned int id) -{ - return (id >= 2) ? &clk_timer_tclk[1] : &clk_timer_tclk[0]; -} - -static inline struct clk *s3c24xx_pwmclk_tdiv(unsigned int id) -{ - return &clk_timer_tdiv[id].clk; -} - -static int clk_pwm_tin_set_parent(struct clk *clk, struct clk *parent) -{ - unsigned int id = clk->id; - unsigned long tcfg1; - unsigned long flags; - unsigned long bits; - unsigned long shift = S3C2410_TCFG1_SHIFT(id); - - if (parent == s3c24xx_pwmclk_tclk(id)) - bits = S3C2410_TCFG1_MUX_TCLK << shift; - else if (parent == s3c24xx_pwmclk_tdiv(id)) - bits = clk_pwm_tdiv_bits(to_tdiv(parent)) << shift; - else - return -EINVAL; - - clk->parent = parent; - - local_irq_save(flags); - - tcfg1 = __raw_readl(S3C2410_TCFG1); - tcfg1 &= ~(S3C2410_TCFG1_MUX_MASK << shift); - __raw_writel(tcfg1 | bits, S3C2410_TCFG1); - - local_irq_restore(flags); - - return 0; -} - -static struct clk clk_tin[] = { - [0] = { - .name = "pwm-tin", - .id = 0, - .set_parent = clk_pwm_tin_set_parent, - }, - [1] = { - .name = "pwm-tin", - .id = 1, - .set_parent = clk_pwm_tin_set_parent, - }, - [2] = { - .name = "pwm-tin", - .id = 2, - .set_parent = clk_pwm_tin_set_parent, - }, - [3] = { - .name = "pwm-tin", - .id = 3, - .set_parent = clk_pwm_tin_set_parent, - }, - [4] = { - .name = "pwm-tin", - .id = 4, - .set_parent = clk_pwm_tin_set_parent, - }, -}; - -static __init int clk_pwm_tin_register(struct clk *pwm) -{ - unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1); - unsigned int id = pwm->id; - - struct clk *parent; - int ret; - - ret = s3c24xx_register_clock(pwm); - if (ret < 0) - return ret; - - tcfg1 >>= S3C2410_TCFG1_SHIFT(id); - tcfg1 &= S3C2410_TCFG1_MUX_MASK; - - if (tcfg1 == S3C2410_TCFG1_MUX_TCLK) - parent = s3c24xx_pwmclk_tclk(id); - else - parent = s3c24xx_pwmclk_tdiv(id); - - return clk_set_parent(pwm, parent); -} - -static __init int s3c24xx_pwmclk_init(void) -{ - struct clk *clk_timers; - unsigned int clk; - int ret; - - clk_timers = clk_get(NULL, "timers"); - if (IS_ERR(clk_timers)) { - printk(KERN_ERR "%s: no parent clock\n", __func__); - return -EINVAL; - } - - for (clk = 0; clk < ARRAY_SIZE(clk_timer_scaler); clk++) { - clk_timer_scaler[clk].parent = clk_timers; - ret = s3c24xx_register_clock(&clk_timer_scaler[clk]); - if (ret < 0) { - printk(KERN_ERR "error adding pwm scaler%d clock\n", clk); - goto err; - } - } - - for (clk = 0; clk < ARRAY_SIZE(clk_timer_tclk); clk++) { - ret = s3c24xx_register_clock(&clk_timer_tclk[clk]); - if (ret < 0) { - printk(KERN_ERR "error adding pww tclk%d\n", clk); - goto err; - } - } - - for (clk = 0; clk < ARRAY_SIZE(clk_timer_tdiv); clk++) { - ret = clk_pwm_tdiv_register(clk); - if (ret < 0) { - printk(KERN_ERR "error adding pwm%d tdiv clock\n", clk); - goto err; - } - } - - for (clk = 0; clk < ARRAY_SIZE(clk_tin); clk++) { - ret = clk_pwm_tin_register(&clk_tin[clk]); - if (ret < 0) { - printk(KERN_ERR "error adding pwm%d tin clock\n", clk); - goto err; - } - } - - return 0; - - err: - return ret; -} - -arch_initcall(s3c24xx_pwmclk_init); -- cgit v1.2.3