msm: timer: Remove SoC specific #ifdefs

The timer frequency is currently ifdefed in addition to setting
the DGT clock's divider value on SCORPIONMP targets. Setup the
frequency dynamically using the existing cpu_is_*() branches and
assign a custom clocksource read function for 7x01a to get the
shift out of the generic path.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: David Brown <davidb@codeaurora.org>

1 files changed, 17 insertions, 21 deletions

diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index fc0646442e09..ca0a957d8626 100644
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c
@@ -40,20 +40,7 @@
 
 #define GPT_HZ 32768
 
-/* TODO: Remove these ifdefs */
-#if defined(CONFIG_ARCH_QSD8X50)
-#define DGT_HZ (19200000 / 4) /* 19.2 MHz / 4 by default */
-#define MSM_DGT_SHIFT (0)
-#elif defined(CONFIG_ARCH_MSM7X30)
-#define DGT_HZ (24576000 / 4) /* 24.576 MHz (LPXO) / 4 by default */
-#define MSM_DGT_SHIFT (0)
-#elif defined(CONFIG_ARCH_MSM8X60) || defined(CONFIG_ARCH_MSM8960)
-#define DGT_HZ (27000000 / 4) /* 27 MHz (PXO) / 4 by default */
-#define MSM_DGT_SHIFT (0)
-#else
-#define DGT_HZ 19200000 /* 19.2 MHz or 600 KHz after shift */
-#define MSM_DGT_SHIFT (5)
-#endif
+#define MSM_DGT_SHIFT 5
 
 static void __iomem *event_base;
 
@@ -123,18 +110,23 @@ static void __iomem *source_base;
 
 static cycle_t msm_read_timer_count(struct clocksource *cs)
 {
+        return readl_relaxed(source_base + TIMER_COUNT_VAL);
+}
+
+static cycle_t msm_read_timer_count_shift(struct clocksource *cs)
+{
         /*
          * Shift timer count down by a constant due to unreliable lower bits
          * on some targets.
          */
-        return readl_relaxed(source_base + TIMER_COUNT_VAL) >> MSM_DGT_SHIFT;
+        return msm_read_timer_count(cs) >> MSM_DGT_SHIFT;
 }
 
 static struct clocksource msm_clocksource = {
         .name   = "dg_timer",
         .rating = 300,
         .read   = msm_read_timer_count,
-        .mask   = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT)),
+        .mask   = CLOCKSOURCE_MASK(32),
         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
@@ -143,27 +135,31 @@ static void __init msm_timer_init(void)
         struct clock_event_device *ce = &msm_clockevent;
         struct clocksource *cs = &msm_clocksource;
         int res;
+        u32 dgt_hz;
 
         if (cpu_is_msm7x01()) {
                 event_base = MSM_CSR_BASE;
                 source_base = MSM_CSR_BASE + 0x10;
+                dgt_hz = 19200000 >> MSM_DGT_SHIFT; /* 600 KHz */
+                cs->read = msm_read_timer_count_shift;
+                cs->mask = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT));
         } else if (cpu_is_msm7x30()) {
                 event_base = MSM_CSR_BASE + 0x04;
                 source_base = MSM_CSR_BASE + 0x24;
+                dgt_hz = 24576000 / 4;
         } else if (cpu_is_qsd8x50()) {
                 event_base = MSM_CSR_BASE;
                 source_base = MSM_CSR_BASE + 0x10;
+                dgt_hz = 19200000 / 4;
         } else if (cpu_is_msm8x60() || cpu_is_msm8960()) {
                 event_base = MSM_TMR_BASE + 0x04;
                 /* Use CPU0's timer as the global clock source. */
                 source_base = MSM_TMR0_BASE + 0x24;
+                dgt_hz = 27000000 / 4;
+                writel_relaxed(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);
         } else
                 BUG();
 
-#ifdef CONFIG_ARCH_MSM_SCORPIONMP
-        writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);
-#endif
-
         writel_relaxed(0, event_base + TIMER_ENABLE);
         writel_relaxed(0, event_base + TIMER_CLEAR);
         writel_relaxed(~0, event_base + TIMER_MATCH_VAL);
@@ -201,7 +197,7 @@ static void __init msm_timer_init(void)
         clockevents_register_device(ce);
 err:
         writel_relaxed(TIMER_ENABLE_EN, source_base + TIMER_ENABLE);
-        res = clocksource_register_hz(cs, DGT_HZ >> MSM_DGT_SHIFT);
+        res = clocksource_register_hz(cs, dgt_hz);
         if (res)
                 pr_err("clocksource_register failed\n");
 }