diff options
Diffstat (limited to 'arch/arm/plat-omap/dmtimer.c')
| -rw-r--r-- | arch/arm/plat-omap/dmtimer.c | 714 |
1 files changed, 412 insertions, 302 deletions
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c index 75a847dd776a..af3b92be8459 100644 --- a/arch/arm/plat-omap/dmtimer.c +++ b/arch/arm/plat-omap/dmtimer.c @@ -3,6 +3,12 @@ * * OMAP Dual-Mode Timers * + * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/ + * Tarun Kanti DebBarma <tarun.kanti@ti.com> + * Thara Gopinath <thara@ti.com> + * + * dmtimer adaptation to platform_driver. + * * Copyright (C) 2005 Nokia Corporation * OMAP2 support by Juha Yrjola * API improvements and OMAP2 clock framework support by Timo Teras @@ -29,168 +35,81 @@ * 675 Mass Ave, Cambridge, MA 02139, USA. */ -#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 <linux/io.h> #include <linux/module.h> -#include <mach/hardware.h> -#include <plat/dmtimer.h> -#include <mach/irqs.h> - -static int dm_timer_count; - -#ifdef CONFIG_ARCH_OMAP1 -static struct omap_dm_timer omap1_dm_timers[] = { - { .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 = 0xfffb7400, .irq = INT_1610_GPTIMER7 }, - { .phys_base = 0xfffbd400, .irq = INT_1610_GPTIMER8 }, -}; - -static const int omap1_dm_timer_count = ARRAY_SIZE(omap1_dm_timers); - -#else -#define omap1_dm_timers NULL -#define omap1_dm_timer_count 0 -#endif /* CONFIG_ARCH_OMAP1 */ - -#ifdef CONFIG_ARCH_OMAP2 -static struct omap_dm_timer omap2_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 *omap2_dm_source_names[] __initdata = { - "sys_ck", - "func_32k_ck", - "alt_ck", - NULL -}; - -static struct clk *omap2_dm_source_clocks[3]; -static const int omap2_dm_timer_count = ARRAY_SIZE(omap2_dm_timers); - -#else -#define omap2_dm_timers NULL -#define omap2_dm_timer_count 0 -#define omap2_dm_source_names NULL -#define omap2_dm_source_clocks NULL -#endif /* CONFIG_ARCH_OMAP2 */ - -#ifdef CONFIG_ARCH_OMAP3 -static struct omap_dm_timer omap3_dm_timers[] = { - { .phys_base = 0x48318000, .irq = INT_24XX_GPTIMER1 }, - { .phys_base = 0x49032000, .irq = INT_24XX_GPTIMER2 }, - { .phys_base = 0x49034000, .irq = INT_24XX_GPTIMER3 }, - { .phys_base = 0x49036000, .irq = INT_24XX_GPTIMER4 }, - { .phys_base = 0x49038000, .irq = INT_24XX_GPTIMER5 }, - { .phys_base = 0x4903A000, .irq = INT_24XX_GPTIMER6 }, - { .phys_base = 0x4903C000, .irq = INT_24XX_GPTIMER7 }, - { .phys_base = 0x4903E000, .irq = INT_24XX_GPTIMER8 }, - { .phys_base = 0x49040000, .irq = INT_24XX_GPTIMER9 }, - { .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 }, - { .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 }, - { .phys_base = 0x48304000, .irq = INT_34XX_GPT12_IRQ }, -}; - -static const char *omap3_dm_source_names[] __initdata = { - "sys_ck", - "omap_32k_fck", - NULL -}; - -static struct clk *omap3_dm_source_clocks[2]; -static const int omap3_dm_timer_count = ARRAY_SIZE(omap3_dm_timers); - -#else -#define omap3_dm_timers NULL -#define omap3_dm_timer_count 0 -#define omap3_dm_source_names NULL -#define omap3_dm_source_clocks NULL -#endif /* CONFIG_ARCH_OMAP3 */ - -#ifdef CONFIG_ARCH_OMAP4 -static struct omap_dm_timer omap4_dm_timers[] = { - { .phys_base = 0x4a318000, .irq = OMAP44XX_IRQ_GPT1 }, - { .phys_base = 0x48032000, .irq = OMAP44XX_IRQ_GPT2 }, - { .phys_base = 0x48034000, .irq = OMAP44XX_IRQ_GPT3 }, - { .phys_base = 0x48036000, .irq = OMAP44XX_IRQ_GPT4 }, - { .phys_base = 0x40138000, .irq = OMAP44XX_IRQ_GPT5 }, - { .phys_base = 0x4013a000, .irq = OMAP44XX_IRQ_GPT6 }, - { .phys_base = 0x4013a000, .irq = OMAP44XX_IRQ_GPT7 }, - { .phys_base = 0x4013e000, .irq = OMAP44XX_IRQ_GPT8 }, - { .phys_base = 0x4803e000, .irq = OMAP44XX_IRQ_GPT9 }, - { .phys_base = 0x48086000, .irq = OMAP44XX_IRQ_GPT10 }, - { .phys_base = 0x48088000, .irq = OMAP44XX_IRQ_GPT11 }, - { .phys_base = 0x4a320000, .irq = OMAP44XX_IRQ_GPT12 }, -}; -static const char *omap4_dm_source_names[] __initdata = { - "sys_clkin_ck", - "sys_32k_ck", - NULL -}; -static struct clk *omap4_dm_source_clocks[2]; -static const int omap4_dm_timer_count = ARRAY_SIZE(omap4_dm_timers); - -#else -#define omap4_dm_timers NULL -#define omap4_dm_timer_count 0 -#define omap4_dm_source_names NULL -#define omap4_dm_source_clocks NULL -#endif /* CONFIG_ARCH_OMAP4 */ +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/pm_runtime.h> -static struct omap_dm_timer *dm_timers; -static const char **dm_source_names; -static struct clk **dm_source_clocks; +#include <plat/dmtimer.h> -static spinlock_t dm_timer_lock; +static LIST_HEAD(omap_timer_list); +static DEFINE_SPINLOCK(dm_timer_lock); -/* - * Reads timer registers in posted and non-posted mode. The posted mode bit - * is encoded in reg. Note that in posted mode write pending bit must be - * checked. Otherwise a read of a non completed write will produce an error. +/** + * omap_dm_timer_read_reg - read timer registers in posted and non-posted mode + * @timer: timer pointer over which read operation to perform + * @reg: lowest byte holds the register offset + * + * The posted mode bit is encoded in reg. Note that in posted mode write + * pending bit must be checked. Otherwise a read of a non completed write + * will produce an error. */ static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg) { - return __omap_dm_timer_read(timer->io_base, reg, timer->posted); + WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET); + return __omap_dm_timer_read(timer, reg, timer->posted); } -/* - * Writes timer registers in posted and non-posted mode. The posted mode bit - * is encoded in reg. Note that in posted mode the write pending bit must be - * checked. Otherwise a write on a register which has a pending write will be - * lost. +/** + * omap_dm_timer_write_reg - write timer registers in posted and non-posted mode + * @timer: timer pointer over which write operation is to perform + * @reg: lowest byte holds the register offset + * @value: data to write into the register + * + * The posted mode bit is encoded in reg. Note that in posted mode the write + * pending bit must be checked. Otherwise a write on a register which has a + * pending write will be lost. */ static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg, u32 value) { - __omap_dm_timer_write(timer->io_base, reg, value, timer->posted); + WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET); + __omap_dm_timer_write(timer, reg, value, timer->posted); +} + +static void omap_timer_restore_context(struct omap_dm_timer *timer) +{ + omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_OFFSET, + timer->context.tiocp_cfg); + if (timer->revision > 1) + __raw_writel(timer->context.tistat, timer->sys_stat); + + __raw_writel(timer->context.tisr, timer->irq_stat); + omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, + timer->context.twer); + omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, + timer->context.tcrr); + omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, + timer->context.tldr); + omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, + timer->context.tmar); + omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, + timer->context.tsicr); + __raw_writel(timer->context.tier, timer->irq_ena); + omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, + timer->context.tclr); } static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer) { int c; + if (!timer->sys_stat) + return; + c = 0; - while (!(omap_dm_timer_read_reg(timer, OMAP_TIMER_SYS_STAT_REG) & 1)) { + while (!(__raw_readl(timer->sys_stat) & 1)) { c++; if (c > 100000) { printk(KERN_ERR "Timer failed to reset\n"); @@ -201,53 +120,65 @@ static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer) static void omap_dm_timer_reset(struct omap_dm_timer *timer) { - int autoidle = 0, wakeup = 0; - - if (!cpu_class_is_omap2() || timer != &dm_timers[0]) { + omap_dm_timer_enable(timer); + if (timer->pdev->id != 1) { 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_32_KHZ); - /* Enable autoidle on OMAP2+ */ - if (cpu_class_is_omap2()) - autoidle = 1; - - /* - * Enable wake-up on OMAP2 CPUs. - */ - if (cpu_class_is_omap2()) - wakeup = 1; - - __omap_dm_timer_reset(timer->io_base, autoidle, wakeup); + __omap_dm_timer_reset(timer, 0, 0); + omap_dm_timer_disable(timer); timer->posted = 1; } -void omap_dm_timer_prepare(struct omap_dm_timer *timer) +int omap_dm_timer_prepare(struct omap_dm_timer *timer) { - omap_dm_timer_enable(timer); - omap_dm_timer_reset(timer); + struct dmtimer_platform_data *pdata = timer->pdev->dev.platform_data; + int ret; + + timer->fclk = clk_get(&timer->pdev->dev, "fck"); + if (WARN_ON_ONCE(IS_ERR_OR_NULL(timer->fclk))) { + timer->fclk = NULL; + dev_err(&timer->pdev->dev, ": No fclk handle.\n"); + return -EINVAL; + } + + if (pdata->needs_manual_reset) + omap_dm_timer_reset(timer); + + ret = omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ); + + timer->posted = 1; + return ret; } struct omap_dm_timer *omap_dm_timer_request(void) { - struct omap_dm_timer *timer = NULL; + struct omap_dm_timer *timer = NULL, *t; unsigned long flags; - int i; + int ret = 0; spin_lock_irqsave(&dm_timer_lock, flags); - for (i = 0; i < dm_timer_count; i++) { - if (dm_timers[i].reserved) + list_for_each_entry(t, &omap_timer_list, node) { + if (t->reserved) continue; - timer = &dm_timers[i]; + timer = t; timer->reserved = 1; break; } + + if (timer) { + ret = omap_dm_timer_prepare(timer); + if (ret) { + timer->reserved = 0; + timer = NULL; + } + } spin_unlock_irqrestore(&dm_timer_lock, flags); - if (timer != NULL) - omap_dm_timer_prepare(timer); + if (!timer) + pr_debug("%s: timer request failed!\n", __func__); return timer; } @@ -255,74 +186,65 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_request); struct omap_dm_timer *omap_dm_timer_request_specific(int id) { - struct omap_dm_timer *timer; + struct omap_dm_timer *timer = NULL, *t; unsigned long flags; + int ret = 0; 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__, __func__, id); - dump_stack(); - return NULL; + list_for_each_entry(t, &omap_timer_list, node) { + if (t->pdev->id == id && !t->reserved) { + timer = t; + timer->reserved = 1; + break; + } } - timer = &dm_timers[id-1]; - timer->reserved = 1; + if (timer) { + ret = omap_dm_timer_prepare(timer); + if (ret) { + timer->reserved = 0; + timer = NULL; + } + } spin_unlock_irqrestore(&dm_timer_lock, flags); - omap_dm_timer_prepare(timer); + if (!timer) + pr_debug("%s: timer%d request failed!\n", __func__, id); return timer; } EXPORT_SYMBOL_GPL(omap_dm_timer_request_specific); -void omap_dm_timer_free(struct omap_dm_timer *timer) +int omap_dm_timer_free(struct omap_dm_timer *timer) { - omap_dm_timer_enable(timer); - omap_dm_timer_reset(timer); - omap_dm_timer_disable(timer); + if (unlikely(!timer)) + return -EINVAL; + + clk_put(timer->fclk); WARN_ON(!timer->reserved); timer->reserved = 0; + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_free); void omap_dm_timer_enable(struct omap_dm_timer *timer) { - if (timer->enabled) - return; - -#ifdef CONFIG_ARCH_OMAP2PLUS - if (cpu_class_is_omap2()) { - clk_enable(timer->fclk); - clk_enable(timer->iclk); - } -#endif - - timer->enabled = 1; + pm_runtime_get_sync(&timer->pdev->dev); } EXPORT_SYMBOL_GPL(omap_dm_timer_enable); void omap_dm_timer_disable(struct omap_dm_timer *timer) { - if (!timer->enabled) - return; - -#ifdef CONFIG_ARCH_OMAP2PLUS - if (cpu_class_is_omap2()) { - clk_disable(timer->iclk); - clk_disable(timer->fclk); - } -#endif - - timer->enabled = 0; + pm_runtime_put(&timer->pdev->dev); } EXPORT_SYMBOL_GPL(omap_dm_timer_disable); int omap_dm_timer_get_irq(struct omap_dm_timer *timer) { - return timer->irq; + if (timer) + return timer->irq; + return -EINVAL; } EXPORT_SYMBOL_GPL(omap_dm_timer_get_irq); @@ -334,24 +256,29 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_get_irq); */ __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask) { - int i; + int i = 0; + struct omap_dm_timer *timer = NULL; + unsigned long flags; /* 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 (i = 0; i < dm_timer_count; i++) { + spin_lock_irqsave(&dm_timer_lock, flags); + list_for_each_entry(timer, &omap_timer_list, node) { u32 l; - l = omap_dm_timer_read_reg(&dm_timers[i], OMAP_TIMER_CTRL_REG); + l = omap_dm_timer_read_reg(timer, 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); } + i++; } + spin_unlock_irqrestore(&dm_timer_lock, flags); return inputmask; } @@ -361,7 +288,9 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask); struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer) { - return timer->fclk; + if (timer) + return timer->fclk; + return NULL; } EXPORT_SYMBOL_GPL(omap_dm_timer_get_fclk); @@ -375,70 +304,91 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask); #endif -void omap_dm_timer_trigger(struct omap_dm_timer *timer) +int omap_dm_timer_trigger(struct omap_dm_timer *timer) { + if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) { + pr_err("%s: timer not available or enabled.\n", __func__); + return -EINVAL; + } + omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0); + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_trigger); -void omap_dm_timer_start(struct omap_dm_timer *timer) +int omap_dm_timer_start(struct omap_dm_timer *timer) { u32 l; + if (unlikely(!timer)) + return -EINVAL; + + omap_dm_timer_enable(timer); + + if (timer->loses_context) { + u32 ctx_loss_cnt_after = + timer->get_context_loss_count(&timer->pdev->dev); + if (ctx_loss_cnt_after != timer->ctx_loss_count) + omap_timer_restore_context(timer); + } + 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); } + + /* Save the context */ + timer->context.tclr = l; + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_start); -void omap_dm_timer_stop(struct omap_dm_timer *timer) +int omap_dm_timer_stop(struct omap_dm_timer *timer) { unsigned long rate = 0; + struct dmtimer_platform_data *pdata = timer->pdev->dev.platform_data; -#ifdef CONFIG_ARCH_OMAP2PLUS - rate = clk_get_rate(timer->fclk); -#endif + if (unlikely(!timer)) + return -EINVAL; + + if (!pdata->needs_manual_reset) + rate = clk_get_rate(timer->fclk); + + __omap_dm_timer_stop(timer, timer->posted, rate); - __omap_dm_timer_stop(timer->io_base, timer->posted, rate); + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_stop); -#ifdef CONFIG_ARCH_OMAP1 - int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source) { - int n = (timer - dm_timers) << 1; - u32 l; + int ret; + struct dmtimer_platform_data *pdata; - l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n); - l |= source << n; - omap_writel(l, MOD_CONF_CTRL_1); - - return 0; -} -EXPORT_SYMBOL_GPL(omap_dm_timer_set_source); + if (unlikely(!timer)) + return -EINVAL; -#else + pdata = timer->pdev->dev.platform_data; -int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source) -{ if (source < 0 || source >= 3) return -EINVAL; - return __omap_dm_timer_set_source(timer->fclk, - dm_source_clocks[source]); + ret = pdata->set_timer_src(timer->pdev, source); + + return ret; } EXPORT_SYMBOL_GPL(omap_dm_timer_set_source); -#endif - -void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, +int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int load) { u32 l; + if (unlikely(!timer)) + return -EINVAL; + + omap_dm_timer_enable(timer); l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); if (autoreload) l |= OMAP_TIMER_CTRL_AR; @@ -448,15 +398,32 @@ void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load); omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0); + /* Save the context */ + timer->context.tclr = l; + timer->context.tldr = load; + omap_dm_timer_disable(timer); + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_set_load); /* Optimized set_load which removes costly spin wait in timer_start */ -void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, +int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int load) { u32 l; + if (unlikely(!timer)) + return -EINVAL; + + omap_dm_timer_enable(timer); + + if (timer->loses_context) { + u32 ctx_loss_cnt_after = + timer->get_context_loss_count(&timer->pdev->dev); + if (ctx_loss_cnt_after != timer->ctx_loss_count) + omap_timer_restore_context(timer); + } + l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); if (autoreload) { l |= OMAP_TIMER_CTRL_AR; @@ -466,15 +433,25 @@ void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, } l |= OMAP_TIMER_CTRL_ST; - __omap_dm_timer_load_start(timer->io_base, l, load, timer->posted); + __omap_dm_timer_load_start(timer, l, load, timer->posted); + + /* Save the context */ + timer->context.tclr = l; + timer->context.tldr = load; + timer->context.tcrr = load; + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_set_load_start); -void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, +int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match) { u32 l; + if (unlikely(!timer)) + return -EINVAL; + + omap_dm_timer_enable(timer); l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); if (enable) l |= OMAP_TIMER_CTRL_CE; @@ -482,14 +459,24 @@ void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, 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); + + /* Save the context */ + timer->context.tclr = l; + timer->context.tmar = match; + omap_dm_timer_disable(timer); + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_set_match); -void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, +int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger) { u32 l; + if (unlikely(!timer)) + return -EINVAL; + + omap_dm_timer_enable(timer); l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM | OMAP_TIMER_CTRL_PT | (0x03 << 10)); @@ -499,13 +486,22 @@ void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, l |= OMAP_TIMER_CTRL_PT; l |= trigger << 10; omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); + + /* Save the context */ + timer->context.tclr = l; + omap_dm_timer_disable(timer); + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_set_pwm); -void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler) +int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler) { u32 l; + if (unlikely(!timer)) + return -EINVAL; + + omap_dm_timer_enable(timer); l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG); l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2)); if (prescaler >= 0x00 && prescaler <= 0x07) { @@ -513,13 +509,28 @@ void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler) l |= prescaler << 2; } omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); + + /* Save the context */ + timer->context.tclr = l; + omap_dm_timer_disable(timer); + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_set_prescaler); -void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, +int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value) { - __omap_dm_timer_int_enable(timer->io_base, value); + if (unlikely(!timer)) + return -EINVAL; + + omap_dm_timer_enable(timer); + __omap_dm_timer_int_enable(timer, value); + + /* Save the context */ + timer->context.tier = value; + timer->context.twer = value; + omap_dm_timer_disable(timer); + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_set_int_enable); @@ -527,40 +538,61 @@ unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer) { unsigned int l; - l = omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG); + if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) { + pr_err("%s: timer not available or enabled.\n", __func__); + return 0; + } + + l = __raw_readl(timer->irq_stat); return l; } EXPORT_SYMBOL_GPL(omap_dm_timer_read_status); -void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value) +int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value) { - __omap_dm_timer_write_status(timer->io_base, value); + if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) + return -EINVAL; + + __omap_dm_timer_write_status(timer, value); + /* Save the context */ + timer->context.tisr = value; + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_write_status); unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer) { - return __omap_dm_timer_read_counter(timer->io_base, timer->posted); + if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) { + pr_err("%s: timer not iavailable or enabled.\n", __func__); + return 0; + } + + return __omap_dm_timer_read_counter(timer, timer->posted); } EXPORT_SYMBOL_GPL(omap_dm_timer_read_counter); -void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value) +int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value) { + if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) { + pr_err("%s: timer not available or enabled.\n", __func__); + return -EINVAL; + } + omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value); + + /* Save the context */ + timer->context.tcrr = value; + return 0; } EXPORT_SYMBOL_GPL(omap_dm_timer_write_counter); 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]; + struct omap_dm_timer *timer; - if (!timer->enabled) + list_for_each_entry(timer, &omap_timer_list, node) { + if (!timer->reserved) continue; if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) & @@ -572,69 +604,147 @@ int omap_dm_timers_active(void) } EXPORT_SYMBOL_GPL(omap_dm_timers_active); -static int __init omap_dm_timer_init(void) +/** + * omap_dm_timer_probe - probe function called for every registered device + * @pdev: pointer to current timer platform device + * + * Called by driver framework at the end of device registration for all + * timer devices. + */ +static int __devinit omap_dm_timer_probe(struct platform_device *pdev) { + int ret; + unsigned long flags; struct omap_dm_timer *timer; - int i, map_size = SZ_8K; /* Module 4KB + L4 4KB except on omap1 */ + struct resource *mem, *irq, *ioarea; + struct dmtimer_platform_data *pdata = pdev->dev.platform_data; - if (!(cpu_is_omap16xx() || cpu_class_is_omap2())) + if (!pdata) { + dev_err(&pdev->dev, "%s: no platform data.\n", __func__); return -ENODEV; + } - spin_lock_init(&dm_timer_lock); - - if (cpu_class_is_omap1()) { - dm_timers = omap1_dm_timers; - dm_timer_count = omap1_dm_timer_count; - map_size = SZ_2K; - } else if (cpu_is_omap24xx()) { - dm_timers = omap2_dm_timers; - dm_timer_count = omap2_dm_timer_count; - dm_source_names = omap2_dm_source_names; - dm_source_clocks = omap2_dm_source_clocks; - } else if (cpu_is_omap34xx()) { - dm_timers = omap3_dm_timers; - dm_timer_count = omap3_dm_timer_count; - dm_source_names = omap3_dm_source_names; - dm_source_clocks = omap3_dm_source_clocks; - } else if (cpu_is_omap44xx()) { - dm_timers = omap4_dm_timers; - dm_timer_count = omap4_dm_timer_count; - dm_source_names = omap4_dm_source_names; - dm_source_clocks = omap4_dm_source_clocks; + irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (unlikely(!irq)) { + dev_err(&pdev->dev, "%s: no IRQ resource.\n", __func__); + return -ENODEV; } - if (cpu_class_is_omap2()) - for (i = 0; dm_source_names[i] != NULL; i++) - dm_source_clocks[i] = clk_get(NULL, dm_source_names[i]); + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (unlikely(!mem)) { + dev_err(&pdev->dev, "%s: no memory resource.\n", __func__); + return -ENODEV; + } - if (cpu_is_omap243x()) - dm_timers[0].phys_base = 0x49018000; + ioarea = request_mem_region(mem->start, resource_size(mem), + pdev->name); + if (!ioarea) { + dev_err(&pdev->dev, "%s: region already claimed.\n", __func__); + return -EBUSY; + } - for (i = 0; i < dm_timer_count; i++) { - timer = &dm_timers[i]; + timer = kzalloc(sizeof(struct omap_dm_timer), GFP_KERNEL); + if (!timer) { + dev_err(&pdev->dev, "%s: no memory for omap_dm_timer.\n", + __func__); + ret = -ENOMEM; + goto err_free_ioregion; + } - /* Static mapping, never released */ - timer->io_base = ioremap(timer->phys_base, map_size); - BUG_ON(!timer->io_base); + timer->io_base = ioremap(mem->start, resource_size(mem)); + if (!timer->io_base) { + dev_err(&pdev->dev, "%s: ioremap failed.\n", __func__); + ret = -ENOMEM; + goto err_free_mem; + } -#ifdef CONFIG_ARCH_OMAP2PLUS - if (cpu_class_is_omap2()) { - char clk_name[16]; - 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); - } + timer->id = pdev->id; + timer->irq = irq->start; + timer->reserved = pdata->reserved; + timer->pdev = pdev; + timer->loses_context = pdata->loses_context; + timer->get_context_loss_count = pdata->get_context_loss_count; + + /* Skip pm_runtime_enable for OMAP1 */ + if (!pdata->needs_manual_reset) { + pm_runtime_enable(&pdev->dev); + pm_runtime_irq_safe(&pdev->dev); + } - /* One or two timers may be set up early for sys_timer */ - if (sys_timer_reserved & (1 << i)) { - timer->reserved = 1; - timer->posted = 1; - } -#endif + if (!timer->reserved) { + pm_runtime_get_sync(&pdev->dev); + __omap_dm_timer_init_regs(timer); + pm_runtime_put(&pdev->dev); } + /* add the timer element to the list */ + spin_lock_irqsave(&dm_timer_lock, flags); + list_add_tail(&timer->node, &omap_timer_list); + spin_unlock_irqrestore(&dm_timer_lock, flags); + + dev_dbg(&pdev->dev, "Device Probed.\n"); + return 0; + +err_free_mem: + kfree(timer); + +err_free_ioregion: + release_mem_region(mem->start, resource_size(mem)); + + return ret; } -arch_initcall(omap_dm_timer_init); +/** + * omap_dm_timer_remove - cleanup a registered timer device + * @pdev: pointer to current timer platform device + * + * Called by driver framework whenever a timer device is unregistered. + * In addition to freeing platform resources it also deletes the timer + * entry from the local list. + */ +static int __devexit omap_dm_timer_remove(struct platform_device *pdev) +{ + struct omap_dm_timer *timer; + unsigned long flags; + int ret = -EINVAL; + + spin_lock_irqsave(&dm_timer_lock, flags); + list_for_each_entry(timer, &omap_timer_list, node) + if (timer->pdev->id == pdev->id) { + list_del(&timer->node); + kfree(timer); + ret = 0; + break; + } + spin_unlock_irqrestore(&dm_timer_lock, flags); + + return ret; +} + +static struct platform_driver omap_dm_timer_driver = { + .probe = omap_dm_timer_probe, + .remove = __devexit_p(omap_dm_timer_remove), + .driver = { + .name = "omap_timer", + }, +}; + +static int __init omap_dm_timer_driver_init(void) +{ + return platform_driver_register(&omap_dm_timer_driver); +} + +static void __exit omap_dm_timer_driver_exit(void) +{ + platform_driver_unregister(&omap_dm_timer_driver); +} + +early_platform_init("earlytimer", &omap_dm_timer_driver); +module_init(omap_dm_timer_driver_init); +module_exit(omap_dm_timer_driver_exit); + +MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); +MODULE_AUTHOR("Texas Instruments Inc"); |