#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;
void __iomem *io_base;
unsigned reserved:1;
unsigned enabled:1;
+ unsigned posted:1;
};
#ifdef CONFIG_ARCH_OMAP1
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)
}
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)
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);
}
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