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
---
Changes in v4: Remove temporary variable cntfrq.
Changes in v3: Move secondary core fix to mp.c. Replace hard-coded value with COUNTER_FREQUENCY.
Changes in v2: Fix CNTFRQ for secondary cores when COUNTER_FREQUENCY_REAL is defined.
README | 8 ++++++++ arch/arm/cpu/armv8/fsl-lsch3/cpu.c | 24 ++++++++++++++++++++++++ arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S | 6 ++++++ arch/arm/cpu/armv8/fsl-lsch3/mp.c | 7 +++++++ arch/arm/cpu/armv8/fsl-lsch3/mp.h | 1 + board/freescale/ls2085a/ls2085a.c | 18 ------------------ include/configs/ls2085a_common.h | 6 +++++- 7 files changed, 51 insertions(+), 19 deletions(-)
diff --git a/README b/README index e710226..f063a74 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/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S b/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S index 886576e..53bdb44 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 ce9c0c1..da7853a 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 66144d6..c985d6a 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 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 5721b18..f6b3ed0 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)