From 207774b213caa3c72ebd6c9f6d1e4a3a666938b7 Mon Sep 17 00:00:00 2001 From: York Sun Date: Fri, 20 Mar 2015 19:28:08 -0700 Subject: 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 CC: Mark Rutland --- 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 + 4 files changed, 38 insertions(+) (limited to 'arch/arm/cpu') 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); -- cgit v1.2.1