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authorYork Sun <yorksun@freescale.com>2015-03-20 19:28:08 -0700
committerYork Sun <yorksun@freescale.com>2015-04-23 08:55:55 -0700
commit207774b213caa3c72ebd6c9f6d1e4a3a666938b7 (patch)
treeb0249e1f667a1c607cc1409dfbe7db7fb9b62840
parent19f9175027b14f11b5a30df17ce76fb6f64dc724 (diff)
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armv8/ls2085a: Fix generic timer clock source
The timer clock is system clock divided by 4, not fixed 12MHz. This is common to the SoC, not board specific. Primary core is fixed when u-boot still runs in board_f. Secondary cores are fixed by reading a variable set by u-boot. Signed-off-by: York Sun <yorksun@freescale.com> CC: Mark Rutland <mark.rutland@arm.com>
-rw-r--r--README8
-rw-r--r--arch/arm/cpu/armv8/fsl-lsch3/cpu.c24
-rw-r--r--arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S6
-rw-r--r--arch/arm/cpu/armv8/fsl-lsch3/mp.c7
-rw-r--r--arch/arm/cpu/armv8/fsl-lsch3/mp.h1
-rw-r--r--board/freescale/ls2085a/ls2085a.c18
-rw-r--r--include/configs/ls2085a_common.h6
7 files changed, 51 insertions, 19 deletions
diff --git a/README b/README
index f5a719db9d..a70af98646 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 94fd1474ed..e985181e8b 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/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S b/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S
index 886576ef99..53bdb4487c 100644
--- a/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S
+++ b/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S
@@ -224,6 +224,9 @@ ENTRY(secondary_boot_func)
/* physical address of this cpus spin table element */
add x11, x1, x0
+ ldr x0, =__real_cntfrq
+ ldr x0, [x0]
+ msr cntfrq_el0, x0 /* set with real frequency */
str x9, [x11, #16] /* LPID */
mov x4, #1
str x4, [x11, #8] /* STATUS */
@@ -275,6 +278,9 @@ ENDPROC(secondary_switch_to_el1)
/* 64 bit alignment for elements accessed as data */
.align 4
+ .global __real_cntfrq
+__real_cntfrq:
+ .quad COUNTER_FREQUENCY
.globl __secondary_boot_code_size
.type __secondary_boot_code_size, %object
/* Secondary Boot Code ends here */
diff --git a/arch/arm/cpu/armv8/fsl-lsch3/mp.c b/arch/arm/cpu/armv8/fsl-lsch3/mp.c
index ce9c0c1bdb..da7853a5af 100644
--- a/arch/arm/cpu/armv8/fsl-lsch3/mp.c
+++ b/arch/arm/cpu/armv8/fsl-lsch3/mp.c
@@ -31,6 +31,13 @@ int fsl_lsch3_wake_seconday_cores(void)
int i, timeout = 10;
u64 *table = get_spin_tbl_addr();
+#ifdef COUNTER_FREQUENCY_REAL
+ /* update for secondary cores */
+ __real_cntfrq = COUNTER_FREQUENCY_REAL;
+ flush_dcache_range((unsigned long)&__real_cntfrq,
+ (unsigned long)&__real_cntfrq + 8);
+#endif
+
cores = cpu_mask();
/* Clear spin table so that secondary processors
* observe the correct value after waking up from wfe.
diff --git a/arch/arm/cpu/armv8/fsl-lsch3/mp.h b/arch/arm/cpu/armv8/fsl-lsch3/mp.h
index 66144d6101..c985d6a6ba 100644
--- a/arch/arm/cpu/armv8/fsl-lsch3/mp.h
+++ b/arch/arm/cpu/armv8/fsl-lsch3/mp.h
@@ -26,6 +26,7 @@
#define id_to_core(x) ((x & 3) | (x >> 6))
#ifndef __ASSEMBLY__
extern u64 __spin_table[];
+extern u64 __real_cntfrq;
extern u64 *secondary_boot_code;
extern size_t __secondary_boot_code_size;
int fsl_lsch3_wake_seconday_cores(void);
diff --git a/board/freescale/ls2085a/ls2085a.c b/board/freescale/ls2085a/ls2085a.c
index e78c63ada0..bd016e90b1 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 5721b18b6f..f6b3ed063f 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)
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