diff options
Diffstat (limited to 'arch/arm/plat-omap/dmtimer.c')
| -rw-r--r-- | arch/arm/plat-omap/dmtimer.c | 428 |
1 files changed, 310 insertions, 118 deletions
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c index eba3cb52ad8..804a5353437 100644 --- a/arch/arm/plat-omap/dmtimer.c +++ b/arch/arm/plat-omap/dmtimer.c @@ -4,7 +4,8 @@ * OMAP Dual-Mode Timers * * Copyright (C) 2005 Nokia Corporation - * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com> + * OMAP2 support by Juha Yrjola + * API improvements and OMAP2 clock framework support by Timo Teras * * 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 @@ -26,15 +27,17 @@ */ #include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/clk.h> +#include <linux/delay.h> #include <asm/hardware.h> #include <asm/arch/dmtimer.h> #include <asm/io.h> #include <asm/arch/irqs.h> -#include <linux/spinlock.h> -#include <linux/list.h> - -#define OMAP_TIMER_COUNT 8 +/* register offsets */ #define OMAP_TIMER_ID_REG 0x00 #define OMAP_TIMER_OCP_CFG_REG 0x10 #define OMAP_TIMER_SYS_STAT_REG 0x14 @@ -50,52 +53,196 @@ #define OMAP_TIMER_CAPTURE_REG 0x3c #define OMAP_TIMER_IF_CTRL_REG 0x40 +/* timer control reg bits */ +#define OMAP_TIMER_CTRL_GPOCFG (1 << 14) +#define OMAP_TIMER_CTRL_CAPTMODE (1 << 13) +#define OMAP_TIMER_CTRL_PT (1 << 12) +#define OMAP_TIMER_CTRL_TCM_LOWTOHIGH (0x1 << 8) +#define OMAP_TIMER_CTRL_TCM_HIGHTOLOW (0x2 << 8) +#define OMAP_TIMER_CTRL_TCM_BOTHEDGES (0x3 << 8) +#define OMAP_TIMER_CTRL_SCPWM (1 << 7) +#define OMAP_TIMER_CTRL_CE (1 << 6) /* compare enable */ +#define OMAP_TIMER_CTRL_PRE (1 << 5) /* prescaler enable */ +#define OMAP_TIMER_CTRL_PTV_SHIFT 2 /* how much to shift the prescaler value */ +#define OMAP_TIMER_CTRL_AR (1 << 1) /* auto-reload enable */ +#define OMAP_TIMER_CTRL_ST (1 << 0) /* start timer */ + +struct omap_dm_timer { + unsigned long phys_base; + int irq; +#ifdef CONFIG_ARCH_OMAP2 + struct clk *iclk, *fclk; +#endif + void __iomem *io_base; + unsigned reserved:1; +}; -static struct dmtimer_info_struct { - struct list_head unused_timers; - struct list_head reserved_timers; -} dm_timer_info; +#ifdef CONFIG_ARCH_OMAP1 static struct omap_dm_timer dm_timers[] = { - { .base=0xfffb1400, .irq=INT_1610_GPTIMER1 }, - { .base=0xfffb1c00, .irq=INT_1610_GPTIMER2 }, - { .base=0xfffb2400, .irq=INT_1610_GPTIMER3 }, - { .base=0xfffb2c00, .irq=INT_1610_GPTIMER4 }, - { .base=0xfffb3400, .irq=INT_1610_GPTIMER5 }, - { .base=0xfffb3c00, .irq=INT_1610_GPTIMER6 }, - { .base=0xfffb4400, .irq=INT_1610_GPTIMER7 }, - { .base=0xfffb4c00, .irq=INT_1610_GPTIMER8 }, - { .base=0x0 }, + { .phys_base = 0xfffb1400, .irq = INT_1610_GPTIMER1 }, + { .phys_base = 0xfffb1c00, .irq = INT_1610_GPTIMER2 }, + { .phys_base = 0xfffb2400, .irq = INT_1610_GPTIMER3 }, + { .phys_base = 0xfffb2c00, .irq = INT_1610_GPTIMER4 }, + { .phys_base = 0xfffb3400, .irq = INT_1610_GPTIMER5 }, + { .phys_base = 0xfffb3c00, .irq = INT_1610_GPTIMER6 }, + { .phys_base = 0xfffb4400, .irq = INT_1610_GPTIMER7 }, + { .phys_base = 0xfffb4c00, .irq = INT_1610_GPTIMER8 }, }; +#elif defined(CONFIG_ARCH_OMAP2) + +static struct omap_dm_timer dm_timers[] = { + { .phys_base = 0x48028000, .irq = INT_24XX_GPTIMER1 }, + { .phys_base = 0x4802a000, .irq = INT_24XX_GPTIMER2 }, + { .phys_base = 0x48078000, .irq = INT_24XX_GPTIMER3 }, + { .phys_base = 0x4807a000, .irq = INT_24XX_GPTIMER4 }, + { .phys_base = 0x4807c000, .irq = INT_24XX_GPTIMER5 }, + { .phys_base = 0x4807e000, .irq = INT_24XX_GPTIMER6 }, + { .phys_base = 0x48080000, .irq = INT_24XX_GPTIMER7 }, + { .phys_base = 0x48082000, .irq = INT_24XX_GPTIMER8 }, + { .phys_base = 0x48084000, .irq = INT_24XX_GPTIMER9 }, + { .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 }, + { .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 }, + { .phys_base = 0x4808a000, .irq = INT_24XX_GPTIMER12 }, +}; + +static const char *dm_source_names[] = { + "sys_ck", + "func_32k_ck", + "alt_ck" +}; +static struct clk *dm_source_clocks[3]; + +#else + +#error OMAP architecture not supported! + +#endif + +static const int dm_timer_count = ARRAY_SIZE(dm_timers); static spinlock_t dm_timer_lock; +static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, int reg) +{ + return readl(timer->io_base + reg); +} -inline void omap_dm_timer_write_reg(struct omap_dm_timer *timer, int reg, u32 value) +static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, int reg, u32 value) { - omap_writel(value, timer->base + reg); + writel(value, timer->io_base + reg); while (omap_dm_timer_read_reg(timer, OMAP_TIMER_WRITE_PEND_REG)) ; } -u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, int reg) +static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer) { - return omap_readl(timer->base + reg); + int c; + + c = 0; + while (!(omap_dm_timer_read_reg(timer, OMAP_TIMER_SYS_STAT_REG) & 1)) { + c++; + if (c > 100000) { + printk(KERN_ERR "Timer failed to reset\n"); + return; + } + } } -int omap_dm_timers_active(void) +static void omap_dm_timer_reset(struct omap_dm_timer *timer) +{ + u32 l; + + if (timer != &dm_timers[0]) { + omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06); + omap_dm_timer_wait_for_reset(timer); + } + omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_SYS_CLK); + + /* Set to smart-idle mode */ + l = omap_dm_timer_read_reg(timer, OMAP_TIMER_OCP_CFG_REG); + l |= 0x02 << 3; + omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, l); +} + +static void omap_dm_timer_prepare(struct omap_dm_timer *timer) +{ +#ifdef CONFIG_ARCH_OMAP2 + clk_enable(timer->iclk); + clk_enable(timer->fclk); +#endif + omap_dm_timer_reset(timer); +} + +struct omap_dm_timer *omap_dm_timer_request(void) +{ + struct omap_dm_timer *timer = NULL; + unsigned long flags; + int i; + + spin_lock_irqsave(&dm_timer_lock, flags); + for (i = 0; i < dm_timer_count; i++) { + if (dm_timers[i].reserved) + continue; + + timer = &dm_timers[i]; + timer->reserved = 1; + break; + } + spin_unlock_irqrestore(&dm_timer_lock, flags); + + if (timer != NULL) + omap_dm_timer_prepare(timer); + + return timer; +} + +struct omap_dm_timer *omap_dm_timer_request_specific(int id) { struct omap_dm_timer *timer; + unsigned long flags; - for (timer = &dm_timers[0]; timer->base; ++timer) - if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) & - OMAP_TIMER_CTRL_ST) - return 1; + spin_lock_irqsave(&dm_timer_lock, flags); + if (id <= 0 || id > dm_timer_count || dm_timers[id-1].reserved) { + spin_unlock_irqrestore(&dm_timer_lock, flags); + printk("BUG: warning at %s:%d/%s(): unable to get timer %d\n", + __FILE__, __LINE__, __FUNCTION__, id); + dump_stack(); + return NULL; + } - return 0; + timer = &dm_timers[id-1]; + timer->reserved = 1; + spin_unlock_irqrestore(&dm_timer_lock, flags); + + omap_dm_timer_prepare(timer); + + return timer; } +void omap_dm_timer_free(struct omap_dm_timer *timer) +{ + omap_dm_timer_reset(timer); +#ifdef CONFIG_ARCH_OMAP2 + clk_disable(timer->iclk); + clk_disable(timer->fclk); +#endif + WARN_ON(!timer->reserved); + timer->reserved = 0; +} + +int omap_dm_timer_get_irq(struct omap_dm_timer *timer) +{ + return timer->irq; +} + +#if defined(CONFIG_ARCH_OMAP1) + +struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer) +{ + BUG(); +} /** * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR @@ -103,184 +250,229 @@ int omap_dm_timers_active(void) */ __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask) { - int n; + int i; /* If ARMXOR cannot be idled this function call is unnecessary */ if (!(inputmask & (1 << 1))) return inputmask; /* If any active timer is using ARMXOR return modified mask */ - for (n = 0; dm_timers[n].base; ++n) - if (omap_dm_timer_read_reg(&dm_timers[n], OMAP_TIMER_CTRL_REG)& - OMAP_TIMER_CTRL_ST) { - if (((omap_readl(MOD_CONF_CTRL_1)>>(n*2)) & 0x03) == 0) + for (i = 0; i < dm_timer_count; i++) { + u32 l; + + l = omap_dm_timer_read_reg(&dm_timers[n], OMAP_TIMER_CTRL_REG); + if (l & OMAP_TIMER_CTRL_ST) { + if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0) inputmask &= ~(1 << 1); else inputmask &= ~(1 << 2); } + } return inputmask; } +#elif defined(CONFIG_ARCH_OMAP2) -void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source) +struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer) { - int n = (timer - dm_timers) << 1; - u32 l; + return timer->fclk; +} - l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n); - l |= source << n; - omap_writel(l, MOD_CONF_CTRL_1); +__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask) +{ + BUG(); } +#endif -static void omap_dm_timer_reset(struct omap_dm_timer *timer) +void omap_dm_timer_trigger(struct omap_dm_timer *timer) { - /* Reset and set posted mode */ - omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06); - omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, 0x02); - - omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_ARMXOR); + omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0); } +void omap_dm_timer_start(struct omap_dm_timer *timer) +{ + u32 l; + l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); + if (!(l & OMAP_TIMER_CTRL_ST)) { + l |= OMAP_TIMER_CTRL_ST; + omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); + } +} -struct omap_dm_timer * omap_dm_timer_request(void) +void omap_dm_timer_stop(struct omap_dm_timer *timer) { - struct omap_dm_timer *timer = NULL; - unsigned long flags; + u32 l; - spin_lock_irqsave(&dm_timer_lock, flags); - if (!list_empty(&dm_timer_info.unused_timers)) { - timer = (struct omap_dm_timer *) - dm_timer_info.unused_timers.next; - list_move_tail((struct list_head *)timer, - &dm_timer_info.reserved_timers); + l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); + if (l & OMAP_TIMER_CTRL_ST) { + l &= ~0x1; + omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); } - spin_unlock_irqrestore(&dm_timer_lock, flags); - - return timer; } +#ifdef CONFIG_ARCH_OMAP1 -void omap_dm_timer_free(struct omap_dm_timer *timer) +void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source) { - unsigned long flags; - - omap_dm_timer_reset(timer); + int n = (timer - dm_timers) << 1; + u32 l; - spin_lock_irqsave(&dm_timer_lock, flags); - list_move_tail((struct list_head *)timer, &dm_timer_info.unused_timers); - spin_unlock_irqrestore(&dm_timer_lock, flags); + l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n); + l |= source << n; + omap_writel(l, MOD_CONF_CTRL_1); } -void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, - unsigned int value) -{ - omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value); -} +#else -unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer) +void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source) { - return omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG); -} + if (source < 0 || source >= 3) + return; -void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value) -{ - omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value); + clk_disable(timer->fclk); + clk_set_parent(timer->fclk, dm_source_clocks[source]); + clk_enable(timer->fclk); + + /* When the functional clock disappears, too quick writes seem to + * cause an abort. */ + __delay(15000); } -void omap_dm_timer_enable_autoreload(struct omap_dm_timer *timer) +#endif + +void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, + unsigned int load) { u32 l; + l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); - l |= OMAP_TIMER_CTRL_AR; + if (autoreload) + l |= OMAP_TIMER_CTRL_AR; + else + l &= ~OMAP_TIMER_CTRL_AR; omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); + omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load); + omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0); } -void omap_dm_timer_trigger(struct omap_dm_timer *timer) -{ - omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 1); -} - -void omap_dm_timer_set_trigger(struct omap_dm_timer *timer, unsigned int value) +void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, + unsigned int match) { u32 l; l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); - l |= value & 0x3; + if (enable) + l |= OMAP_TIMER_CTRL_CE; + else + l &= ~OMAP_TIMER_CTRL_CE; omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); + omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match); } -void omap_dm_timer_start(struct omap_dm_timer *timer) + +void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, + int toggle, int trigger) { u32 l; l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); - l |= OMAP_TIMER_CTRL_ST; + l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM | + OMAP_TIMER_CTRL_PT | (0x03 << 10)); + if (def_on) + l |= OMAP_TIMER_CTRL_SCPWM; + if (toggle) + l |= OMAP_TIMER_CTRL_PT; + l |= trigger << 10; omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); } -void omap_dm_timer_stop(struct omap_dm_timer *timer) +void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler) { u32 l; l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); - l &= ~0x1; + l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2)); + if (prescaler >= 0x00 && prescaler <= 0x07) { + l |= OMAP_TIMER_CTRL_PRE; + l |= prescaler << 2; + } omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); } -unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer) +void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, + unsigned int value) { - return omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG); + omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value); } -void omap_dm_timer_reset_counter(struct omap_dm_timer *timer) +unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer) { - omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, 0); + return omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG); } -void omap_dm_timer_set_load(struct omap_dm_timer *timer, unsigned int load) +void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value) { - omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load); + omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value); } -void omap_dm_timer_set_match(struct omap_dm_timer *timer, unsigned int match) +unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer) { - omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match); + return omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG); } -void omap_dm_timer_enable_compare(struct omap_dm_timer *timer) +void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value) { - u32 l; - - l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); - l |= OMAP_TIMER_CTRL_CE; - omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); + return omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value); } +int omap_dm_timers_active(void) +{ + int i; + + for (i = 0; i < dm_timer_count; i++) { + struct omap_dm_timer *timer; + + timer = &dm_timers[i]; + if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) & + OMAP_TIMER_CTRL_ST) + return 1; + } + return 0; +} -static inline void __dm_timer_init(void) +int omap_dm_timer_init(void) { struct omap_dm_timer *timer; + int i; + + if (!(cpu_is_omap16xx() || cpu_is_omap24xx())) + return -ENODEV; spin_lock_init(&dm_timer_lock); - INIT_LIST_HEAD(&dm_timer_info.unused_timers); - INIT_LIST_HEAD(&dm_timer_info.reserved_timers); - - timer = &dm_timers[0]; - while (timer->base) { - list_add_tail((struct list_head *)timer, &dm_timer_info.unused_timers); - omap_dm_timer_reset(timer); - timer++; +#ifdef CONFIG_ARCH_OMAP2 + for (i = 0; i < ARRAY_SIZE(dm_source_names); i++) { + dm_source_clocks[i] = clk_get(NULL, dm_source_names[i]); + BUG_ON(dm_source_clocks[i] == NULL); + } +#endif + + for (i = 0; i < dm_timer_count; i++) { +#ifdef CONFIG_ARCH_OMAP2 + char clk_name[16]; +#endif + + timer = &dm_timers[i]; + timer->io_base = (void __iomem *) io_p2v(timer->phys_base); +#ifdef CONFIG_ARCH_OMAP2 + sprintf(clk_name, "gpt%d_ick", i + 1); + timer->iclk = clk_get(NULL, clk_name); + sprintf(clk_name, "gpt%d_fck", i + 1); + timer->fclk = clk_get(NULL, clk_name); +#endif } -} -static int __init omap_dm_timer_init(void) -{ - if (cpu_is_omap16xx()) - __dm_timer_init(); return 0; } - -arch_initcall(omap_dm_timer_init); |