diff options
Diffstat (limited to 'arch/arm/cpu/armv7/exynos/lowlevel_init.c')
| -rw-r--r-- | arch/arm/cpu/armv7/exynos/lowlevel_init.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/exynos/lowlevel_init.c b/arch/arm/cpu/armv7/exynos/lowlevel_init.c index 83e1dcfc1e..120aaf8b96 100644 --- a/arch/arm/cpu/armv7/exynos/lowlevel_init.c +++ b/arch/arm/cpu/armv7/exynos/lowlevel_init.c @@ -31,7 +31,10 @@ #include <asm/arch/tzpc.h> #include <asm/arch/periph.h> #include <asm/arch/pinmux.h> +#include <asm/arch/system.h> +#include <asm/armv7.h> #include "common_setup.h" +#include "exynos5_setup.h" /* These are the things we can do during low-level init */ enum { @@ -42,6 +45,128 @@ enum { DO_POWER = 1 << 4, }; +#ifdef CONFIG_EXYNOS5420 +/* + * Power up secondary CPUs. + */ +static void secondary_cpu_start(void) +{ + v7_enable_smp(EXYNOS5420_INFORM_BASE); + svc32_mode_en(); + branch_bx(CONFIG_EXYNOS_RELOCATE_CODE_BASE); +} + +/* + * This is the entry point of hotplug-in and + * cluster switching. + */ +static void low_power_start(void) +{ + uint32_t val, reg_val; + + reg_val = readl(EXYNOS5420_SPARE_BASE); + if (reg_val != CPU_RST_FLAG_VAL) { + writel(0x0, CONFIG_LOWPOWER_FLAG); + branch_bx(0x0); + } + + reg_val = readl(CONFIG_PHY_IRAM_BASE + 0x4); + if (reg_val != (uint32_t)&low_power_start) { + /* Store jump address as low_power_start if not present */ + writel((uint32_t)&low_power_start, CONFIG_PHY_IRAM_BASE + 0x4); + dsb(); + sev(); + } + + /* Set the CPU to SVC32 mode */ + svc32_mode_en(); + +#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; + mcr_tlb(val); + mcr_icache(val); + + /* Disable MMU stuff and caches */ + mrc_sctlr(val); + + val &= ~((0x2 << 12) | 0x7); + val |= ((0x1 << 12) | (0x8 << 8) | 0x2); + mcr_sctlr(val); + + /* CPU state is hotplug or reset */ + secondary_cpu_start(); + + /* Core should not enter into WFI here */ + wfi(); +} + +/* + * Pointer to this function is stored in iRam which is used + * for jump and power down of a specific core. + */ +static void power_down_core(void) +{ + uint32_t tmp, core_id, core_config; + + /* Get the unique core id */ + /* + * Multiprocessor Affinity Register + * [11:8] Cluster ID + * [1:0] CPU ID + */ + mrc_mpafr(core_id); + tmp = core_id & 0x3; + core_id = (core_id >> 6) & ~3; + core_id |= tmp; + core_id &= 0x3f; + + /* Set the status of the core to low */ + core_config = (core_id * CPU_CONFIG_STATUS_OFFSET); + core_config += EXYNOS5420_CPU_CONFIG_BASE; + writel(0x0, core_config); + + /* Core enter WFI */ + wfi(); +} + +/* + * Configurations for secondary cores are inapt at this stage. + * Reconfigure secondary cores. Shutdown and change the status + * of all cores except the primary core. + */ +static void secondary_cores_configure(void) +{ + /* Clear secondary boot iRAM base */ + writel(0x0, (CONFIG_EXYNOS_RELOCATE_CODE_BASE + 0x1C)); + + /* set lowpower flag and address */ + writel(CPU_RST_FLAG_VAL, CONFIG_LOWPOWER_FLAG); + writel((uint32_t)&low_power_start, CONFIG_LOWPOWER_ADDR); + writel(CPU_RST_FLAG_VAL, EXYNOS5420_SPARE_BASE); + /* Store jump address for power down */ + writel((uint32_t)&power_down_core, CONFIG_PHY_IRAM_BASE + 0x4); + + /* Need all core power down check */ + dsb(); + sev(); +} + +extern void relocate_wait_code(void); +#endif + int do_lowlevel_init(void) { uint32_t reset_status; @@ -49,6 +174,28 @@ int do_lowlevel_init(void) arch_cpu_init(); +#ifndef CONFIG_SYS_L2CACHE_OFF + /* + * Init L2 cache parameters here for use by boot and resume + * + * These are here instead of in v7_outer_cache_enable() so that the + * L2 cache settings get properly set even at resume time or if we're + * running U-Boot with the cache off. The kernel still needs us to + * set these for it. + */ + configure_l2_ctlr(); + configure_l2_actlr(); + dsb(); + isb(); +#endif + +#ifdef CONFIG_EXYNOS5420 + relocate_wait_code(); + + /* Reconfigure secondary cores */ + secondary_cores_configure(); +#endif + reset_status = get_reset_status(); switch (reset_status) { |