[U-Boot] [PATCH 04/28] armv8/ls2085a: Fix generic timer clock source

[York Sun]

The timer clock is system clock divided by 4, not fixed 12MHz. This is
common to the SoC, not board specific.

Signed-off-by: York Sun <yorksun at freescale.com>
---
 README                             |    8 ++++++++
 arch/arm/cpu/armv8/fsl-lsch3/cpu.c |   24 ++++++++++++++++++++++++
 board/freescale/ls2085a/ls2085a.c  |   18 ------------------
 include/configs/ls2085a_common.h   |    6 +++++-
 4 files changed, 37 insertions(+), 19 deletions(-)

diff --git a/README b/README
index f473515..776ebf4 100644
--- a/README
+++ b/README
@@ -690,6 +690,14 @@ The following options need to be configured:
 		exists, unlike the similar options in the Linux kernel. Do not
 		set these options unless they apply!
 
+		COUNTER_FREQUENCY
+		Generic timer clock source frequency.
+
+		COUNTER_FREQUENCY_REAL
+		Generic timer clock source frequency if the real clock is
+		different from COUNTER_FREQUENCY, and can only be determined
+		at run time.
+
 		NOTE: The following can be machine specific errata. These
 		do have ability to provide rudimentary version and machine
 		specific checks, but expect no product checks.
diff --git a/arch/arm/cpu/armv8/fsl-lsch3/cpu.c b/arch/arm/cpu/armv8/fsl-lsch3/cpu.c
index 94fd147..e985181 100644
--- a/arch/arm/cpu/armv8/fsl-lsch3/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-lsch3/cpu.c
@@ -395,3 +395,27 @@ int arch_early_init_r(void)
 
 	return 0;
 }
+
+int timer_init(void)
+{
+	u32 __iomem *cntcr = (u32 *)CONFIG_SYS_FSL_TIMER_ADDR;
+	u32 __iomem *cltbenr = (u32 *)CONFIG_SYS_FSL_PMU_CLTBENR;
+#ifdef COUNTER_FREQUENCY_REAL
+	unsigned long cntfrq = COUNTER_FREQUENCY_REAL;
+
+	/* Update with accurate clock frequency */
+	asm volatile("msr cntfrq_el0, %0" : : "r" (cntfrq) : "memory");
+#endif
+
+	/* Enable timebase for all clusters.
+	 * It is safe to do so even some clusters are not enabled.
+	 */
+	out_le32(cltbenr, 0xf);
+
+	/* Enable clock for timer
+	 * This is a global setting.
+	 */
+	out_le32(cntcr, 0x1);
+
+	return 0;
+}
diff --git a/board/freescale/ls2085a/ls2085a.c b/board/freescale/ls2085a/ls2085a.c
index e78c63a..bd016e9 100644
--- a/board/freescale/ls2085a/ls2085a.c
+++ b/board/freescale/ls2085a/ls2085a.c
@@ -55,24 +55,6 @@ int dram_init(void)
 	return 0;
 }
 
-int timer_init(void)
-{
-	u32 __iomem *cntcr = (u32 *)CONFIG_SYS_FSL_TIMER_ADDR;
-	u32 __iomem *cltbenr = (u32 *)CONFIG_SYS_FSL_PMU_CLTBENR;
-
-	/* Enable timebase for all clusters.
-	 * It is safe to do so even some clusters are not enabled.
-	 */
-	out_le32(cltbenr, 0xf);
-
-	/* Enable clock for timer
-	 * This is a global setting.
-	 */
-	out_le32(cntcr, 0x1);
-
-	return 0;
-}
-
 /*
  * Board specific reset that is system reset.
  */
diff --git a/include/configs/ls2085a_common.h b/include/configs/ls2085a_common.h
index 339337d..b47cf68 100644
--- a/include/configs/ls2085a_common.h
+++ b/include/configs/ls2085a_common.h
@@ -72,7 +72,11 @@
 #define CONFIG_DP_DDR_NUM_CTRLS		1
 
 /* Generic Timer Definitions */
-#define COUNTER_FREQUENCY		12000000	/* 12MHz */
+/*
+ * This is not an accurate number. It is used in start.S. The frequency
+ * will be udpated later when get_bus_freq(0) is available.
+ */
+#define COUNTER_FREQUENCY		25000000	/* 25MHz */
 
 /* Size of malloc() pool */
 #define CONFIG_SYS_MALLOC_LEN		(CONFIG_ENV_SIZE + 2048 * 1024)
-- 
1.7.9.5