diff options
Diffstat (limited to 'arch/arm/cpu/armv7/exynos/lowlevel_init.c')
| -rw-r--r-- | arch/arm/cpu/armv7/exynos/lowlevel_init.c | 51 |
1 files changed, 50 insertions, 1 deletions
diff --git a/arch/arm/cpu/armv7/exynos/lowlevel_init.c b/arch/arm/cpu/armv7/exynos/lowlevel_init.c index b94e49f..0504576 100644 --- a/arch/arm/cpu/armv7/exynos/lowlevel_init.c +++ b/arch/arm/cpu/armv7/exynos/lowlevel_init.c @@ -47,6 +47,42 @@ enum { #ifdef CONFIG_EXYNOS5420 /* + * Enable ECC by setting L2CTLR[21]. + * Set L2CTLR[7] to make tag ram latency 3 cycles and + * set L2CTLR[1] to make data ram latency 3 cycles. + * We need to make RAM latency of 3 cycles here because cores + * power ON and OFF while switching. And everytime a core powers + * ON, iROM provides it a default L2CTLR value 0x400 which stands + * for TAG RAM setup of 1 cycle. Hence, we face a need of + * restoring data and tag latency values. + */ +static void configure_l2_ctlr(void) +{ + uint32_t val; + + mrc_l2_ctlr(val); + val |= (1 << 21); + val |= (1 << 7); + val |= (1 << 1); + mcr_l2_ctlr(val); +} + +/* + * Set L2ACTLR[27] to prevent the clock generator from stopping + * the L2 logic clock. + * Set L2ACTLR[3] to disable clean/evict push to external. + */ +static void configure_l2_actlr(void) +{ + uint32_t val; + + mrc_l2_aux_ctlr(val); + val |= (1 << 27); + val |= (1 << 3); + mcr_l2_aux_ctlr(val); +} + +/* * Power up secondary CPUs. */ static void secondary_cpu_start(void) @@ -80,7 +116,19 @@ static void low_power_start(void) /* Set the CPU to SVC32 mode */ svc32_mode_en(); - v7_enable_l2_hazard_detect(); + +#ifndef CONFIG_SYS_L2CACHE_OFF + /* Read MIDR for Primary Part Number */ + mrc_midr(val); + val = (val >> 4); + val &= 0xf; + + if (val == 0xf) { + configure_l2_ctlr(); + configure_l2_actlr(); + v7_enable_l2_hazard_detect(); + } +#endif /* Invalidate L1 & TLB */ val = 0x0; @@ -138,6 +186,7 @@ static void power_down_core(void) static void secondary_cores_configure(void) { /* Setup L2 cache */ + configure_l2_ctlr(); v7_enable_l2_hazard_detect(); /* Clear secondary boot iRAM base */ |