diff options
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/timer-ti-dm.c | 98 |
1 files changed, 44 insertions, 54 deletions
diff --git a/drivers/clocksource/timer-ti-dm.c b/drivers/clocksource/timer-ti-dm.c index 070d47d6a88c..61c3c7684314 100644 --- a/drivers/clocksource/timer-ti-dm.c +++ b/drivers/clocksource/timer-ti-dm.c @@ -68,14 +68,29 @@ static inline u32 dmtimer_read(struct omap_dm_timer *timer, u32 reg) return readl_relaxed(timer->func_base + offset); } -static inline void __omap_dm_timer_write(struct omap_dm_timer *timer, - u32 reg, u32 val, int posted) +/** + * dmtimer_write - 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 inline void dmtimer_write(struct omap_dm_timer *timer, u32 reg, u32 val) { - if (posted) - while (readl_relaxed(timer->pend) & (reg >> WPSHIFT)) + u16 wp, offset; + + wp = reg >> WPSHIFT; + offset = reg & 0xff; + + /* Wait for a possible write pending bit in posted mode */ + if (wp && timer->posted) + while (readl_relaxed(timer->pend) & wp) cpu_relax(); - writel_relaxed(val, timer->func_base + (reg & 0xff)); + writel_relaxed(val, timer->func_base + offset); } static inline void __omap_dm_timer_init_regs(struct omap_dm_timer *timer) @@ -120,25 +135,24 @@ static inline void __omap_dm_timer_enable_posted(struct omap_dm_timer *timer) if (timer->errata & OMAP_TIMER_ERRATA_I103_I767) { timer->posted = OMAP_TIMER_NONPOSTED; - __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0, 0); + dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0); return; } - __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG, - OMAP_TIMER_CTRL_POSTED, 0); + dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, OMAP_TIMER_CTRL_POSTED); timer->context.tsicr = OMAP_TIMER_CTRL_POSTED; timer->posted = OMAP_TIMER_POSTED; } static inline void __omap_dm_timer_stop(struct omap_dm_timer *timer, - int posted, unsigned long rate) + unsigned long rate) { u32 l; l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG); if (l & OMAP_TIMER_CTRL_ST) { l &= ~0x1; - __omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, l, posted); + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); #ifdef CONFIG_ARCH_OMAP2PLUS /* Readback to make sure write has completed */ dmtimer_read(timer, OMAP_TIMER_CTRL_REG); @@ -158,7 +172,7 @@ static inline void __omap_dm_timer_int_enable(struct omap_dm_timer *timer, unsigned int value) { writel_relaxed(value, timer->irq_ena); - __omap_dm_timer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value, 0); + dmtimer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value); } static inline unsigned int @@ -173,41 +187,17 @@ static inline void __omap_dm_timer_write_status(struct omap_dm_timer *timer, writel_relaxed(value, timer->irq_stat); } -/** - * 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) -{ - 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(timer, OMAP_TIMER_OCP_CFG_OFFSET, - timer->context.ocp_cfg, 0); - - 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); + dmtimer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, timer->context.ocp_cfg); + + dmtimer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, timer->context.twer); + dmtimer_write(timer, OMAP_TIMER_COUNTER_REG, timer->context.tcrr); + dmtimer_write(timer, OMAP_TIMER_LOAD_REG, timer->context.tldr); + dmtimer_write(timer, OMAP_TIMER_MATCH_REG, timer->context.tmar); + dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, timer->context.tsicr); writel_relaxed(timer->context.tier, timer->irq_ena); - omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, - timer->context.tclr); + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, timer->context.tclr); } static void omap_timer_save_context(struct omap_dm_timer *timer) @@ -256,7 +246,7 @@ static int omap_dm_timer_reset(struct omap_dm_timer *timer) if (timer->revision != 1) return -EINVAL; - omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06); + dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0x06); do { l = dmtimer_read(timer, OMAP_TIMER_V1_SYS_STAT_OFFSET); @@ -270,7 +260,7 @@ static int omap_dm_timer_reset(struct omap_dm_timer *timer) /* Configure timer for smart-idle mode */ l = dmtimer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET); l |= 0x2 << 0x3; - __omap_dm_timer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l, 0); + dmtimer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l); timer->posted = 0; @@ -586,7 +576,7 @@ static int omap_dm_timer_start(struct omap_dm_timer *timer) l = dmtimer_read(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); + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); } return 0; @@ -602,7 +592,7 @@ static int omap_dm_timer_stop(struct omap_dm_timer *timer) if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) rate = clk_get_rate(timer->fclk); - __omap_dm_timer_stop(timer, timer->posted, rate); + __omap_dm_timer_stop(timer, rate); omap_dm_timer_disable(timer); return 0; @@ -615,7 +605,7 @@ static int omap_dm_timer_set_load(struct omap_dm_timer *timer, return -EINVAL; omap_dm_timer_enable(timer); - omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load); + dmtimer_write(timer, OMAP_TIMER_LOAD_REG, load); omap_dm_timer_disable(timer); return 0; @@ -635,8 +625,8 @@ static int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, l |= OMAP_TIMER_CTRL_CE; else l &= ~OMAP_TIMER_CTRL_CE; - omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match); - omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); + dmtimer_write(timer, OMAP_TIMER_MATCH_REG, match); + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); omap_dm_timer_disable(timer); return 0; @@ -661,7 +651,7 @@ static int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, l |= trigger << 10; if (autoreload) l |= OMAP_TIMER_CTRL_AR; - omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); omap_dm_timer_disable(timer); return 0; @@ -696,7 +686,7 @@ static int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, l |= OMAP_TIMER_CTRL_PRE; l |= prescaler << 2; } - omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l); + dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l); omap_dm_timer_disable(timer); return 0; @@ -736,7 +726,7 @@ static int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask) writel_relaxed(l, timer->irq_dis); l = dmtimer_read(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask; - omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, l); + dmtimer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, l); omap_dm_timer_disable(timer); return 0; @@ -783,7 +773,7 @@ static int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int return -EINVAL; } - omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value); + dmtimer_write(timer, OMAP_TIMER_COUNTER_REG, value); /* Save the context */ timer->context.tcrr = value; |