diff options
| -rw-r--r-- | arch/arm/plat-omap/dmtimer.c | 193 |
1 files changed, 151 insertions, 42 deletions
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c index 302ad8dff2c..822b6bb5c74 100644 --- a/arch/arm/plat-omap/dmtimer.c +++ b/arch/arm/plat-omap/dmtimer.c @@ -38,34 +38,113 @@ #include <asm/arch/irqs.h> /* register offsets */ -#define OMAP_TIMER_ID_REG 0x00 -#define OMAP_TIMER_OCP_CFG_REG 0x10 -#define OMAP_TIMER_SYS_STAT_REG 0x14 -#define OMAP_TIMER_STAT_REG 0x18 -#define OMAP_TIMER_INT_EN_REG 0x1c -#define OMAP_TIMER_WAKEUP_EN_REG 0x20 -#define OMAP_TIMER_CTRL_REG 0x24 -#define OMAP_TIMER_COUNTER_REG 0x28 -#define OMAP_TIMER_LOAD_REG 0x2c -#define OMAP_TIMER_TRIGGER_REG 0x30 -#define OMAP_TIMER_WRITE_PEND_REG 0x34 -#define OMAP_TIMER_MATCH_REG 0x38 -#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 */ +#define _OMAP_TIMER_ID_OFFSET 0x00 +#define _OMAP_TIMER_OCP_CFG_OFFSET 0x10 +#define _OMAP_TIMER_SYS_STAT_OFFSET 0x14 +#define _OMAP_TIMER_STAT_OFFSET 0x18 +#define _OMAP_TIMER_INT_EN_OFFSET 0x1c +#define _OMAP_TIMER_WAKEUP_EN_OFFSET 0x20 +#define _OMAP_TIMER_CTRL_OFFSET 0x24 +#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 /* prescaler value shift */ +#define OMAP_TIMER_CTRL_POSTED (1 << 2) +#define OMAP_TIMER_CTRL_AR (1 << 1) /* auto-reload enable */ +#define OMAP_TIMER_CTRL_ST (1 << 0) /* start timer */ +#define _OMAP_TIMER_COUNTER_OFFSET 0x28 +#define _OMAP_TIMER_LOAD_OFFSET 0x2c +#define _OMAP_TIMER_TRIGGER_OFFSET 0x30 +#define _OMAP_TIMER_WRITE_PEND_OFFSET 0x34 +#define WP_NONE 0 /* no write pending bit */ +#define WP_TCLR (1 << 0) +#define WP_TCRR (1 << 1) +#define WP_TLDR (1 << 2) +#define WP_TTGR (1 << 3) +#define WP_TMAR (1 << 4) +#define WP_TPIR (1 << 5) +#define WP_TNIR (1 << 6) +#define WP_TCVR (1 << 7) +#define WP_TOCR (1 << 8) +#define WP_TOWR (1 << 9) +#define _OMAP_TIMER_MATCH_OFFSET 0x38 +#define _OMAP_TIMER_CAPTURE_OFFSET 0x3c +#define _OMAP_TIMER_IF_CTRL_OFFSET 0x40 +#define _OMAP_TIMER_CAPTURE2_OFFSET 0x44 /* TCAR2, 34xx only */ +#define _OMAP_TIMER_TICK_POS_OFFSET 0x48 /* TPIR, 34xx only */ +#define _OMAP_TIMER_TICK_NEG_OFFSET 0x4c /* TNIR, 34xx only */ +#define _OMAP_TIMER_TICK_COUNT_OFFSET 0x50 /* TCVR, 34xx only */ +#define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET 0x54 /* TOCR, 34xx only */ +#define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET 0x58 /* TOWR, 34xx only */ + +/* register offsets with the write pending bit encoded */ +#define WPSHIFT 16 + +#define OMAP_TIMER_ID_REG (_OMAP_TIMER_ID_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_OCP_CFG_REG (_OMAP_TIMER_OCP_CFG_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_SYS_STAT_REG (_OMAP_TIMER_SYS_STAT_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_STAT_REG (_OMAP_TIMER_STAT_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_INT_EN_REG (_OMAP_TIMER_INT_EN_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_WAKEUP_EN_REG (_OMAP_TIMER_WAKEUP_EN_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_CTRL_REG (_OMAP_TIMER_CTRL_OFFSET \ + | (WP_TCLR << WPSHIFT)) + +#define OMAP_TIMER_COUNTER_REG (_OMAP_TIMER_COUNTER_OFFSET \ + | (WP_TCRR << WPSHIFT)) + +#define OMAP_TIMER_LOAD_REG (_OMAP_TIMER_LOAD_OFFSET \ + | (WP_TLDR << WPSHIFT)) + +#define OMAP_TIMER_TRIGGER_REG (_OMAP_TIMER_TRIGGER_OFFSET \ + | (WP_TTGR << WPSHIFT)) + +#define OMAP_TIMER_WRITE_PEND_REG (_OMAP_TIMER_WRITE_PEND_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_MATCH_REG (_OMAP_TIMER_MATCH_OFFSET \ + | (WP_TMAR << WPSHIFT)) + +#define OMAP_TIMER_CAPTURE_REG (_OMAP_TIMER_CAPTURE_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_IF_CTRL_REG (_OMAP_TIMER_IF_CTRL_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_CAPTURE2_REG (_OMAP_TIMER_CAPTURE2_OFFSET \ + | (WP_NONE << WPSHIFT)) + +#define OMAP_TIMER_TICK_POS_REG (_OMAP_TIMER_TICK_POS_OFFSET \ + | (WP_TPIR << WPSHIFT)) + +#define OMAP_TIMER_TICK_NEG_REG (_OMAP_TIMER_TICK_NEG_OFFSET \ + | (WP_TNIR << WPSHIFT)) + +#define OMAP_TIMER_TICK_COUNT_REG (_OMAP_TIMER_TICK_COUNT_OFFSET \ + | (WP_TCVR << WPSHIFT)) + +#define OMAP_TIMER_TICK_INT_MASK_SET_REG \ + (_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT)) + +#define OMAP_TIMER_TICK_INT_MASK_COUNT_REG \ + (_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT)) struct omap_dm_timer { unsigned long phys_base; @@ -76,6 +155,7 @@ struct omap_dm_timer { void __iomem *io_base; unsigned reserved:1; unsigned enabled:1; + unsigned posted:1; }; #ifdef CONFIG_ARCH_OMAP1 @@ -181,16 +261,34 @@ static struct clk **dm_source_clocks; static spinlock_t dm_timer_lock; -static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, int reg) +/* + * 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. + */ +static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg) { - return readl(timer->io_base + reg); + if (timer->posted) + while (readl(timer->io_base + (OMAP_TIMER_WRITE_PEND_REG & 0xff)) + & (reg >> WPSHIFT)) + cpu_relax(); + return readl(timer->io_base + (reg & 0xff)); } -static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, int reg, u32 value) +/* + * 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. + */ +static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg, + u32 value) { - writel(value, timer->io_base + reg); - while (omap_dm_timer_read_reg(timer, OMAP_TIMER_WRITE_PEND_REG)) - ; + if (timer->posted) + while (readl(timer->io_base + (OMAP_TIMER_WRITE_PEND_REG & 0xff)) + & (reg >> WPSHIFT)) + cpu_relax(); + writel(value, timer->io_base + (reg & 0xff)); } static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer) @@ -217,17 +315,23 @@ static void omap_dm_timer_reset(struct omap_dm_timer *timer) } omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ); - /* Set to smart-idle mode */ l = omap_dm_timer_read_reg(timer, OMAP_TIMER_OCP_CFG_REG); - l |= 0x02 << 3; - - if (cpu_class_is_omap2() && timer == &dm_timers[0]) { - /* Enable wake-up only for GPT1 on OMAP2 CPUs*/ + l |= 0x02 << 3; /* Set to smart-idle mode */ + l |= 0x2 << 8; /* Set clock activity to perserve f-clock on idle */ + + /* + * Enable wake-up only for GPT1 on OMAP2 CPUs. + * FIXME: All timers should have wake-up enabled and clear + * PRCM status. + */ + if (cpu_class_is_omap2() && (timer == &dm_timers[0])) l |= 1 << 2; - /* Non-posted mode */ - omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0); - } omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, l); + + /* Match hardware reset default of posted mode */ + omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, + OMAP_TIMER_CTRL_POSTED); + timer->posted = 1; } static void omap_dm_timer_prepare(struct omap_dm_timer *timer) @@ -434,6 +538,11 @@ void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, 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); + + /* REVISIT: hw feature, ttgr overtaking tldr? */ + while (readl(timer->io_base + (OMAP_TIMER_WRITE_PEND_REG & 0xff))) + cpu_relax(); + omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0); } |