Merge branch 'fixes-timer' of github.com:jonhunter/linux into omap-for-v3.8/timer

6 files changed, 188 insertions, 91 deletions

diff --git a/arch/arm/mach-omap2/omap_hwmod_2xxx_ipblock_data.c b/arch/arm/mach-omap2/omap_hwmod_2xxx_ipblock_data.c
index a0116d08cf45..0db8f450bad9 100644
--- a/arch/arm/mach-omap2/omap_hwmod_2xxx_ipblock_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_2xxx_ipblock_data.c
@@ -58,8 +58,9 @@ static struct omap_hwmod_class_sysconfig omap2xxx_timer_sysc = {
         .syss_offs      = 0x0014,
         .sysc_flags     = (SYSC_HAS_SIDLEMODE | SYSC_HAS_CLOCKACTIVITY |
                            SYSC_HAS_ENAWAKEUP | SYSC_HAS_SOFTRESET |
-                           SYSC_HAS_AUTOIDLE),
+                           SYSC_HAS_AUTOIDLE | SYSS_HAS_RESET_STATUS),
         .idlemodes      = (SIDLE_FORCE | SIDLE_NO | SIDLE_SMART),
+        .clockact       = CLOCKACT_TEST_ICLK,
         .sysc_fields    = &omap_hwmod_sysc_type1,
 };
 
@@ -268,6 +269,7 @@ struct omap_hwmod omap2xxx_timer1_hwmod = {
         },
         .dev_attr       = &capability_alwon_dev_attr,
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer2 */
@@ -286,6 +288,7 @@ struct omap_hwmod omap2xxx_timer2_hwmod = {
                 },
         },
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer3 */
@@ -304,6 +307,7 @@ struct omap_hwmod omap2xxx_timer3_hwmod = {
                 },
         },
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer4 */
@@ -322,6 +326,7 @@ struct omap_hwmod omap2xxx_timer4_hwmod = {
                 },
         },
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer5 */
@@ -341,6 +346,7 @@ struct omap_hwmod omap2xxx_timer5_hwmod = {
         },
         .dev_attr       = &capability_dsp_dev_attr,
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer6 */
@@ -360,6 +366,7 @@ struct omap_hwmod omap2xxx_timer6_hwmod = {
         },
         .dev_attr       = &capability_dsp_dev_attr,
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer7 */
@@ -379,6 +386,7 @@ struct omap_hwmod omap2xxx_timer7_hwmod = {
         },
         .dev_attr       = &capability_dsp_dev_attr,
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer8 */
@@ -398,6 +406,7 @@ struct omap_hwmod omap2xxx_timer8_hwmod = {
         },
         .dev_attr       = &capability_dsp_dev_attr,
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer9 */
@@ -417,6 +426,7 @@ struct omap_hwmod omap2xxx_timer9_hwmod = {
         },
         .dev_attr       = &capability_pwm_dev_attr,
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer10 */
@@ -436,6 +446,7 @@ struct omap_hwmod omap2xxx_timer10_hwmod = {
         },
         .dev_attr       = &capability_pwm_dev_attr,
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer11 */
@@ -455,6 +466,7 @@ struct omap_hwmod omap2xxx_timer11_hwmod = {
         },
         .dev_attr       = &capability_pwm_dev_attr,
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer12 */
@@ -474,6 +486,7 @@ struct omap_hwmod omap2xxx_timer12_hwmod = {
         },
         .dev_attr       = &capability_pwm_dev_attr,
         .class          = &omap2xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* wd_timer2 */
diff --git a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
index abe66ced903f..addc1c24ca2e 100644
--- a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
@@ -153,29 +153,16 @@ static struct omap_hwmod omap3xxx_debugss_hwmod = {
 };
 
 /* timer class */
-static struct omap_hwmod_class_sysconfig omap3xxx_timer_1ms_sysc = {
-        .rev_offs       = 0x0000,
-        .sysc_offs      = 0x0010,
-        .syss_offs      = 0x0014,
-        .sysc_flags     = (SYSC_HAS_SIDLEMODE | SYSC_HAS_CLOCKACTIVITY |
-                                SYSC_HAS_ENAWAKEUP | SYSC_HAS_SOFTRESET |
-                                SYSC_HAS_EMUFREE | SYSC_HAS_AUTOIDLE),
-        .idlemodes      = (SIDLE_FORCE | SIDLE_NO | SIDLE_SMART),
-        .sysc_fields    = &omap_hwmod_sysc_type1,
-};
-
-static struct omap_hwmod_class omap3xxx_timer_1ms_hwmod_class = {
-        .name = "timer",
-        .sysc = &omap3xxx_timer_1ms_sysc,
-};
-
 static struct omap_hwmod_class_sysconfig omap3xxx_timer_sysc = {
         .rev_offs       = 0x0000,
         .sysc_offs      = 0x0010,
         .syss_offs      = 0x0014,
-        .sysc_flags     = (SYSC_HAS_SIDLEMODE | SYSC_HAS_ENAWAKEUP |
-                           SYSC_HAS_SOFTRESET | SYSC_HAS_AUTOIDLE),
+        .sysc_flags     = (SYSC_HAS_SIDLEMODE | SYSC_HAS_CLOCKACTIVITY |
+                           SYSC_HAS_ENAWAKEUP | SYSC_HAS_SOFTRESET |
+                           SYSC_HAS_EMUFREE | SYSC_HAS_AUTOIDLE |
+                           SYSS_HAS_RESET_STATUS),
         .idlemodes      = (SIDLE_FORCE | SIDLE_NO | SIDLE_SMART),
+        .clockact       = CLOCKACT_TEST_ICLK,
         .sysc_fields    = &omap_hwmod_sysc_type1,
 };
 
@@ -224,7 +211,8 @@ static struct omap_hwmod omap3xxx_timer1_hwmod = {
                 },
         },
         .dev_attr       = &capability_alwon_dev_attr,
-        .class          = &omap3xxx_timer_1ms_hwmod_class,
+        .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer2 */
@@ -241,7 +229,8 @@ static struct omap_hwmod omap3xxx_timer2_hwmod = {
                         .idlest_idle_bit = OMAP3430_ST_GPT2_SHIFT,
                 },
         },
-        .class          = &omap3xxx_timer_1ms_hwmod_class,
+        .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer3 */
@@ -259,6 +248,7 @@ static struct omap_hwmod omap3xxx_timer3_hwmod = {
                 },
         },
         .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer4 */
@@ -276,6 +266,7 @@ static struct omap_hwmod omap3xxx_timer4_hwmod = {
                 },
         },
         .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer5 */
@@ -294,6 +285,7 @@ static struct omap_hwmod omap3xxx_timer5_hwmod = {
         },
         .dev_attr       = &capability_dsp_dev_attr,
         .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer6 */
@@ -312,6 +304,7 @@ static struct omap_hwmod omap3xxx_timer6_hwmod = {
         },
         .dev_attr       = &capability_dsp_dev_attr,
         .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer7 */
@@ -330,6 +323,7 @@ static struct omap_hwmod omap3xxx_timer7_hwmod = {
         },
         .dev_attr       = &capability_dsp_dev_attr,
         .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer8 */
@@ -348,6 +342,7 @@ static struct omap_hwmod omap3xxx_timer8_hwmod = {
         },
         .dev_attr       = &capability_dsp_pwm_dev_attr,
         .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer9 */
@@ -366,6 +361,7 @@ static struct omap_hwmod omap3xxx_timer9_hwmod = {
         },
         .dev_attr       = &capability_pwm_dev_attr,
         .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer10 */
@@ -383,7 +379,8 @@ static struct omap_hwmod omap3xxx_timer10_hwmod = {
                 },
         },
         .dev_attr       = &capability_pwm_dev_attr,
-        .class          = &omap3xxx_timer_1ms_hwmod_class,
+        .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer11 */
@@ -402,6 +399,7 @@ static struct omap_hwmod omap3xxx_timer11_hwmod = {
         },
         .dev_attr       = &capability_pwm_dev_attr,
         .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /* timer12 */
@@ -425,6 +423,7 @@ static struct omap_hwmod omap3xxx_timer12_hwmod = {
         },
         .dev_attr       = &capability_secure_dev_attr,
         .class          = &omap3xxx_timer_hwmod_class,
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
 };
 
 /*
diff --git a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
index 7a6132848f5d..399f4ce9cab1 100644
--- a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
@@ -3067,6 +3067,7 @@ static struct omap_hwmod_class_sysconfig omap44xx_timer_1ms_sysc = {
                            SYSC_HAS_SIDLEMODE | SYSC_HAS_SOFTRESET |
                            SYSS_HAS_RESET_STATUS),
         .idlemodes      = (SIDLE_FORCE | SIDLE_NO | SIDLE_SMART),
+        .clockact       = CLOCKACT_TEST_ICLK,
         .sysc_fields    = &omap_hwmod_sysc_type1,
 };
 
@@ -3120,6 +3121,7 @@ static struct omap_hwmod omap44xx_timer1_hwmod = {
         .name           = "timer1",
         .class          = &omap44xx_timer_1ms_hwmod_class,
         .clkdm_name     = "l4_wkup_clkdm",
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
         .mpu_irqs       = omap44xx_timer1_irqs,
         .main_clk       = "timer1_fck",
         .prcm = {
@@ -3142,6 +3144,7 @@ static struct omap_hwmod omap44xx_timer2_hwmod = {
         .name           = "timer2",
         .class          = &omap44xx_timer_1ms_hwmod_class,
         .clkdm_name     = "l4_per_clkdm",
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
         .mpu_irqs       = omap44xx_timer2_irqs,
         .main_clk       = "timer2_fck",
         .prcm = {
@@ -3316,6 +3319,7 @@ static struct omap_hwmod omap44xx_timer10_hwmod = {
         .name           = "timer10",
         .class          = &omap44xx_timer_1ms_hwmod_class,
         .clkdm_name     = "l4_per_clkdm",
+        .flags          = HWMOD_SET_DEFAULT_CLOCKACT,
         .mpu_irqs       = omap44xx_timer10_irqs,
         .main_clk       = "timer10_fck",
         .prcm = {
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 684d2fc3d485..099e4060afe9 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -108,7 +108,7 @@ static int omap2_gp_timer_set_next_event(unsigned long cycles,
                                          struct clock_event_device *evt)
 {
         __omap_dm_timer_load_start(&clkev, OMAP_TIMER_CTRL_ST,
-                                                0xffffffff - cycles, 1);
+                                   0xffffffff - cycles, OMAP_TIMER_POSTED);
 
         return 0;
 }
@@ -118,7 +118,7 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
 {
         u32 period;
 
-        __omap_dm_timer_stop(&clkev, 1, clkev.rate);
+        __omap_dm_timer_stop(&clkev, OMAP_TIMER_POSTED, clkev.rate);
 
         switch (mode) {
         case CLOCK_EVT_MODE_PERIODIC:
@@ -126,10 +126,10 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
                 period -= 1;
                 /* Looks like we need to first set the load value separately */
                 __omap_dm_timer_write(&clkev, OMAP_TIMER_LOAD_REG,
-                                        0xffffffff - period, 1);
+                                      0xffffffff - period, OMAP_TIMER_POSTED);
                 __omap_dm_timer_load_start(&clkev,
                                         OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST,
-                                                0xffffffff - period, 1);
+                                        0xffffffff - period, OMAP_TIMER_POSTED);
                 break;
         case CLOCK_EVT_MODE_ONESHOT:
                 break;
@@ -222,10 +222,24 @@ void __init omap_dmtimer_init(void)
         }
 }
 
+/**
+ * omap_dm_timer_get_errata - get errata flags for a timer
+ *
+ * Get the timer errata flags that are specific to the OMAP device being used.
+ */
+u32 __init omap_dm_timer_get_errata(void)
+{
+        if (cpu_is_omap24xx())
+                return 0;
+
+        return OMAP_TIMER_ERRATA_I103_I767;
+}
+
 static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
                                                 int gptimer_id,
                                                 const char *fck_source,
-                                                const char *property)
+                                                const char *property,
+                                                int posted)
 {
         char name[10]; /* 10 = sizeof("gptXX_Xck0") */
         const char *oh_name;
@@ -260,9 +274,7 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
                 oh_name = name;
         }
 
-        omap_hwmod_setup_one(oh_name);
         oh = omap_hwmod_lookup(oh_name);
-
         if (!oh)
                 return -ENODEV;
 
@@ -292,8 +304,6 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
         if (IS_ERR(timer->fclk))
                 return -ENODEV;
 
-        omap_hwmod_enable(oh);
-
         /* FIXME: Need to remove hard-coded test on timer ID */
         if (gptimer_id != 12) {
                 struct clk *src;
@@ -302,19 +312,26 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
                 if (IS_ERR(src)) {
                         res = -EINVAL;
                 } else {
-                        res = __omap_dm_timer_set_source(timer->fclk, src);
+                        res = clk_set_parent(timer->fclk, src);
                         if (IS_ERR_VALUE(res))
                                 pr_warn("%s: %s cannot set source\n",
                                         __func__, oh->name);
                         clk_put(src);
                 }
         }
+
+        omap_hwmod_setup_one(oh_name);
+        omap_hwmod_enable(oh);
         __omap_dm_timer_init_regs(timer);
-        __omap_dm_timer_reset(timer, 1, 1);
-        timer->posted = 1;
 
-        timer->rate = clk_get_rate(timer->fclk);
+        if (posted)
+                __omap_dm_timer_enable_posted(timer);
+
+        /* Check that the intended posted configuration matches the actual */
+        if (posted != timer->posted)
+                return -EINVAL;
 
+        timer->rate = clk_get_rate(timer->fclk);
         timer->reserved = 1;
 
         return res;
@@ -326,7 +343,17 @@ static void __init omap2_gp_clockevent_init(int gptimer_id,
 {
         int res;
 
-        res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source, property);
+        clkev.errata = omap_dm_timer_get_errata();
+
+        /*
+         * For clock-event timers we never read the timer counter and
+         * so we are not impacted by errata i103 and i767. Therefore,
+         * we can safely ignore this errata for clock-event timers.
+         */
+        __omap_dm_timer_override_errata(&clkev, OMAP_TIMER_ERRATA_I103_I767);
+
+        res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source, property,
+                                     OMAP_TIMER_POSTED);
         BUG_ON(res);
 
         omap2_gp_timer_irq.dev_id = &clkev;
@@ -359,7 +386,8 @@ static bool use_gptimer_clksrc;
  */
 static cycle_t clocksource_read_cycles(struct clocksource *cs)
 {
-        return (cycle_t)__omap_dm_timer_read_counter(&clksrc, 1);
+        return (cycle_t)__omap_dm_timer_read_counter(&clksrc,
+                                                     OMAP_TIMER_NONPOSTED);
 }
 
 static struct clocksource clocksource_gpt = {
@@ -373,7 +401,8 @@ static struct clocksource clocksource_gpt = {
 static u32 notrace dmtimer_read_sched_clock(void)
 {
         if (clksrc.reserved)
-                return __omap_dm_timer_read_counter(&clksrc, 1);
+                return __omap_dm_timer_read_counter(&clksrc,
+                                                    OMAP_TIMER_NONPOSTED);
 
         return 0;
 }
@@ -451,11 +480,15 @@ static void __init omap2_gptimer_clocksource_init(int gptimer_id,
 {
         int res;
 
-        res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source, NULL);
+        clksrc.errata = omap_dm_timer_get_errata();
+
+        res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source, NULL,
+                                     OMAP_TIMER_NONPOSTED);
         BUG_ON(res);
 
         __omap_dm_timer_load_start(&clksrc,
-                        OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1);
+                                   OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0,
+                                   OMAP_TIMER_NONPOSTED);
         setup_sched_clock(dmtimer_read_sched_clock, 32, clksrc.rate);
 
         if (clocksource_register_hz(&clocksource_gpt, clksrc.rate))
@@ -693,6 +726,7 @@ static int __init omap_timer_init(struct omap_hwmod *oh, void *unused)
         if (timer_dev_attr)
                 pdata->timer_capability = timer_dev_attr->timer_capability;
 
+        pdata->timer_errata = omap_dm_timer_get_errata();
         pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;
 
         pdev = omap_device_build(name, id, oh, pdata, sizeof(*pdata),
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 9dca23e4d6b0..9deeb3064d33 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -35,6 +35,7 @@
  * 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/clk.h>
 #include <linux/module.h>
 #include <linux/io.h>
 #include <linux/device.h>
@@ -83,10 +84,6 @@ static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
 
 static void omap_timer_restore_context(struct omap_dm_timer *timer)
 {
-        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,
@@ -121,21 +118,13 @@ static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer)
 
 static void omap_dm_timer_reset(struct omap_dm_timer *timer)
 {
-        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_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
+        omap_dm_timer_wait_for_reset(timer);
         __omap_dm_timer_reset(timer, 0, 0);
-        omap_dm_timer_disable(timer);
-        timer->posted = 1;
 }
 
 int omap_dm_timer_prepare(struct omap_dm_timer *timer)
 {
-        int ret;
-
         /*
          * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
          * do not call clk_get() for these devices.
@@ -149,13 +138,15 @@ int omap_dm_timer_prepare(struct omap_dm_timer *timer)
                 }
         }
 
+        omap_dm_timer_enable(timer);
+
         if (timer->capability & OMAP_TIMER_NEEDS_RESET)
                 omap_dm_timer_reset(timer);
 
-        ret = omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
+        __omap_dm_timer_enable_posted(timer);
+        omap_dm_timer_disable(timer);
 
-        timer->posted = 1;
-        return ret;
+        return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
 }
 
 static inline u32 omap_dm_timer_reserved_systimer(int id)
@@ -449,7 +440,6 @@ int omap_dm_timer_stop(struct omap_dm_timer *timer)
          */
         timer->context.tclr =
                         omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-        timer->context.tisr = __raw_readl(timer->irq_stat);
         omap_dm_timer_disable(timer);
         return 0;
 }
@@ -459,7 +449,7 @@ int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 {
         int ret;
         char *parent_name = NULL;
-        struct clk *fclk, *parent;
+        struct clk *parent;
         struct dmtimer_platform_data *pdata;
 
         if (unlikely(!timer))
@@ -478,11 +468,8 @@ int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
         if (pdata && pdata->set_timer_src)
                 return pdata->set_timer_src(timer->pdev, source);
 
-        fclk = clk_get(&timer->pdev->dev, "fck");
-        if (IS_ERR_OR_NULL(fclk)) {
-                pr_err("%s: fck not found\n", __func__);
+        if (!timer->fclk)
                 return -EINVAL;
-        }
 
         switch (source) {
         case OMAP_TIMER_SRC_SYS_CLK:
@@ -501,18 +488,15 @@ int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
         parent = clk_get(&timer->pdev->dev, parent_name);
         if (IS_ERR_OR_NULL(parent)) {
                 pr_err("%s: %s not found\n", __func__, parent_name);
-                ret = -EINVAL;
-                goto out;
+                return -EINVAL;
         }
 
-        ret = clk_set_parent(fclk, parent);
+        ret = clk_set_parent(timer->fclk, parent);
         if (IS_ERR_VALUE(ret))
                 pr_err("%s: failed to set %s as parent\n", __func__,
                         parent_name);
 
         clk_put(parent);
-out:
-        clk_put(fclk);
 
         return ret;
 }
@@ -595,8 +579,8 @@ 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_CTRL_REG, l);
         omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
+        omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 
         /* Save the context */
         timer->context.tclr = l;
@@ -672,6 +656,37 @@ int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
 }
 EXPORT_SYMBOL_GPL(omap_dm_timer_set_int_enable);
 
+/**
+ * omap_dm_timer_set_int_disable - disable timer interrupts
+ * @timer:      pointer to timer handle
+ * @mask:       bit mask of interrupts to be disabled
+ *
+ * Disables the specified timer interrupts for a timer.
+ */
+int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask)
+{
+        u32 l = mask;
+
+        if (unlikely(!timer))
+                return -EINVAL;
+
+        omap_dm_timer_enable(timer);
+
+        if (timer->revision == 1)
+                l = __raw_readl(timer->irq_ena) & ~mask;
+
+        __raw_writel(l, timer->irq_dis);
+        l = omap_dm_timer_read_reg(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask;
+        omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, l);
+
+        /* Save the context */
+        timer->context.tier &= ~mask;
+        timer->context.twer &= ~mask;
+        omap_dm_timer_disable(timer);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_set_int_disable);
+
 unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
 {
         unsigned int l;
@@ -693,8 +708,7 @@ int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
                 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);
@@ -797,6 +811,7 @@ static int __devinit omap_dm_timer_probe(struct platform_device *pdev)
                         timer->capability |= OMAP_TIMER_SECURE;
         } else {
                 timer->id = pdev->id;
+                timer->errata = pdata->timer_errata;
                 timer->capability = pdata->timer_capability;
                 timer->reserved = omap_dm_timer_reserved_systimer(timer->id);
                 timer->get_context_loss_count = pdata->get_context_loss_count;
diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h
index f8943c8f9dbf..05a36e16f3f4 100644
--- a/arch/arm/plat-omap/include/plat/dmtimer.h
+++ b/arch/arm/plat-omap/include/plat/dmtimer.h
@@ -32,7 +32,6 @@
  * 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
@@ -55,6 +54,10 @@
 #define OMAP_TIMER_TRIGGER_OVERFLOW             0x01
 #define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02
 
+/* posted mode types */
+#define OMAP_TIMER_NONPOSTED                    0x00
+#define OMAP_TIMER_POSTED                       0x01
+
 /* timer capabilities used in hwmod database */
 #define OMAP_TIMER_SECURE                               0x80000000
 #define OMAP_TIMER_ALWON                                0x40000000
@@ -62,6 +65,16 @@
 #define OMAP_TIMER_NEEDS_RESET                          0x10000000
 #define OMAP_TIMER_HAS_DSP_IRQ                          0x08000000
 
+/*
+ * timer errata flags
+ *
+ * Errata i103/i767 impacts all OMAP3/4/5 devices including AM33xx. This
+ * errata prevents us from using posted mode on these devices, unless the
+ * timer counter register is never read. For more details please refer to
+ * the OMAP3/4/5 errata documents.
+ */
+#define OMAP_TIMER_ERRATA_I103_I767                     0x80000000
+
 struct omap_timer_capability_dev_attr {
         u32 timer_capability;
 };
@@ -70,8 +83,6 @@ struct omap_dm_timer;
 
 struct timer_regs {
         u32 tidr;
-        u32 tistat;
-        u32 tisr;
         u32 tier;
         u32 twer;
         u32 tclr;
@@ -93,6 +104,7 @@ struct timer_regs {
 struct dmtimer_platform_data {
         /* set_timer_src - Only used for OMAP1 devices */
         int (*set_timer_src)(struct platform_device *pdev, int source);
+        u32 timer_errata;
         u32 timer_capability;
         int (*get_context_loss_count)(struct device *);
 };
@@ -122,6 +134,7 @@ int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, i
 int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler);
 
 int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value);
+int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask);
 
 unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer);
 int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value);
@@ -269,6 +282,7 @@ struct omap_dm_timer {
         int ctx_loss_count;
         int revision;
         u32 capability;
+        u32 errata;
         struct platform_device *pdev;
         struct list_head node;
 };
@@ -307,7 +321,7 @@ static inline void __omap_dm_timer_init_regs(struct omap_dm_timer *timer)
                                 OMAP_TIMER_V1_SYS_STAT_OFFSET;
                 timer->irq_stat = timer->io_base + OMAP_TIMER_V1_STAT_OFFSET;
                 timer->irq_ena = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
-                timer->irq_dis = NULL;
+                timer->irq_dis = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
                 timer->pend = timer->io_base + _OMAP_TIMER_WRITE_PEND_OFFSET;
                 timer->func_base = timer->io_base;
         } else {
@@ -340,28 +354,46 @@ static inline void __omap_dm_timer_reset(struct omap_dm_timer *timer,
                 l |= 1 << 2;
 
         __raw_writel(l, timer->io_base + OMAP_TIMER_OCP_CFG_OFFSET);
-
-        /* Match hardware reset default of posted mode */
-        __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
-                                        OMAP_TIMER_CTRL_POSTED, 0);
 }
 
-static inline int __omap_dm_timer_set_source(struct clk *timer_fck,
-                                                struct clk *parent)
+/*
+ * __omap_dm_timer_enable_posted - enables write posted mode
+ * @timer:      pointer to timer instance handle
+ *
+ * Enables the write posted mode for the timer. When posted mode is enabled
+ * writes to certain timer registers are immediately acknowledged by the
+ * internal bus and hence prevents stalling the CPU waiting for the write to
+ * complete. Enabling this feature can improve performance for writing to the
+ * timer registers.
+ */
+static inline void __omap_dm_timer_enable_posted(struct omap_dm_timer *timer)
 {
-        int ret;
+        if (timer->posted)
+                return;
 
-        clk_disable(timer_fck);
-        ret = clk_set_parent(timer_fck, parent);
-        clk_enable(timer_fck);
+        if (timer->errata & OMAP_TIMER_ERRATA_I103_I767)
+                return;
 
-        /*
-         * When the functional clock disappears, too quick writes seem
-         * to cause an abort. XXX Is this still necessary?
-         */
-        __delay(300000);
+        __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
+                              OMAP_TIMER_CTRL_POSTED, 0);
+        timer->context.tsicr = OMAP_TIMER_CTRL_POSTED;
+        timer->posted = OMAP_TIMER_POSTED;
+}
 
-        return ret;
+/**
+ * __omap_dm_timer_override_errata - override errata flags for a timer
+ * @timer:      pointer to timer handle
+ * @errata:     errata flags to be ignored
+ *
+ * For a given timer, override a timer errata by clearing the flags
+ * specified by the errata argument. A specific erratum should only be
+ * overridden for a timer if the timer is used in such a way the erratum
+ * has no impact.
+ */
+static inline void __omap_dm_timer_override_errata(struct omap_dm_timer *timer,
+                                                   u32 errata)
+{
+        timer->errata &= ~errata;
 }
 
 static inline void __omap_dm_timer_stop(struct omap_dm_timer *timer,