summaryrefslogtreecommitdiff
path: root/arch/arm/cpu
diff options
context:
space:
mode:
authorTom Rini <trini@konsulko.com>2015-03-01 22:05:54 -0500
committerTom Rini <trini@konsulko.com>2015-03-01 22:05:54 -0500
commit6fa361903cdb673ec325a56125391088da257e81 (patch)
treef098e32c64f58070f1d69955806b14dbda571ad6 /arch/arm/cpu
parent1da7ce4155d0839d9d56525379493bb0f80b5330 (diff)
parent306f527eff269e48a98c9d83016df6d6877dbb6a (diff)
downloadu-boot-imx-6fa361903cdb673ec325a56125391088da257e81.zip
u-boot-imx-6fa361903cdb673ec325a56125391088da257e81.tar.gz
u-boot-imx-6fa361903cdb673ec325a56125391088da257e81.tar.bz2
Merge branch 'master' of git://git.denx.de/u-boot-samsung
Diffstat (limited to 'arch/arm/cpu')
-rw-r--r--arch/arm/cpu/armv7/exynos/Makefile2
-rw-r--r--arch/arm/cpu/armv7/exynos/common_setup.h62
-rw-r--r--arch/arm/cpu/armv7/exynos/exynos5_setup.h3
-rw-r--r--arch/arm/cpu/armv7/exynos/lowlevel_init.c147
-rw-r--r--arch/arm/cpu/armv7/exynos/sec_boot.S128
-rw-r--r--arch/arm/cpu/armv7/exynos/soc.c35
6 files changed, 342 insertions, 35 deletions
diff --git a/arch/arm/cpu/armv7/exynos/Makefile b/arch/arm/cpu/armv7/exynos/Makefile
index e207bd6..8542f89 100644
--- a/arch/arm/cpu/armv7/exynos/Makefile
+++ b/arch/arm/cpu/armv7/exynos/Makefile
@@ -7,6 +7,8 @@
obj-y += clock.o power.o soc.o system.o pinmux.o tzpc.o
+obj-$(CONFIG_EXYNOS5420) += sec_boot.o
+
ifdef CONFIG_SPL_BUILD
obj-$(CONFIG_EXYNOS5) += clock_init_exynos5.o
obj-$(CONFIG_EXYNOS5) += dmc_common.o dmc_init_ddr3.o
diff --git a/arch/arm/cpu/armv7/exynos/common_setup.h b/arch/arm/cpu/armv7/exynos/common_setup.h
index e6318c0..5235abb 100644
--- a/arch/arm/cpu/armv7/exynos/common_setup.h
+++ b/arch/arm/cpu/armv7/exynos/common_setup.h
@@ -23,6 +23,8 @@
* MA 02111-1307 USA
*/
+#include <asm/arch/system.h>
+
#define DMC_OFFSET 0x10000
/*
@@ -43,3 +45,63 @@ void system_clock_init(void);
int do_lowlevel_init(void);
void sdelay(unsigned long);
+
+enum l2_cache_params {
+ CACHE_DATA_RAM_LATENCY_2_CYCLES = (2 << 0),
+ CACHE_DATA_RAM_LATENCY_3_CYCLES = (3 << 0),
+ CACHE_DISABLE_CLEAN_EVICT = (1 << 3),
+ CACHE_DATA_RAM_SETUP = (1 << 5),
+ CACHE_TAG_RAM_LATENCY_2_CYCLES = (2 << 6),
+ CACHE_TAG_RAM_LATENCY_3_CYCLES = (3 << 6),
+ CACHE_ENABLE_HAZARD_DETECT = (1 << 7),
+ CACHE_TAG_RAM_SETUP = (1 << 9),
+ CACHE_ECC_AND_PARITY = (1 << 21),
+ CACHE_ENABLE_FORCE_L2_LOGIC = (1 << 27)
+};
+
+
+#ifndef CONFIG_SYS_L2CACHE_OFF
+/*
+ * Configure L2CTLR to get timings that keep us from hanging/crashing.
+ *
+ * Must be inline here since low_power_start() is called without a
+ * stack (!).
+ */
+static inline void configure_l2_ctlr(void)
+{
+ uint32_t val;
+
+ mrc_l2_ctlr(val);
+
+ val |= CACHE_TAG_RAM_SETUP |
+ CACHE_DATA_RAM_SETUP |
+ CACHE_TAG_RAM_LATENCY_2_CYCLES |
+ CACHE_DATA_RAM_LATENCY_2_CYCLES;
+
+ if (proid_is_exynos5420() || proid_is_exynos5800()) {
+ val |= CACHE_ECC_AND_PARITY |
+ CACHE_TAG_RAM_LATENCY_3_CYCLES |
+ CACHE_DATA_RAM_LATENCY_3_CYCLES;
+ }
+
+ mcr_l2_ctlr(val);
+}
+
+/*
+ * Configure L2ACTLR.
+ *
+ * Must be inline here since low_power_start() is called without a
+ * stack (!).
+ */
+static inline void configure_l2_actlr(void)
+{
+ uint32_t val;
+
+ if (proid_is_exynos5420() || proid_is_exynos5800()) {
+ mrc_l2_aux_ctlr(val);
+ val |= CACHE_ENABLE_FORCE_L2_LOGIC |
+ CACHE_DISABLE_CLEAN_EVICT;
+ mcr_l2_aux_ctlr(val);
+ }
+}
+#endif
diff --git a/arch/arm/cpu/armv7/exynos/exynos5_setup.h b/arch/arm/cpu/armv7/exynos/exynos5_setup.h
index 2eea48a..9073f50 100644
--- a/arch/arm/cpu/armv7/exynos/exynos5_setup.h
+++ b/arch/arm/cpu/armv7/exynos/exynos5_setup.h
@@ -700,6 +700,9 @@
#define CLK_DIV_CPERI1_VAL NOT_AVAILABLE
#else
+
+#define CPU_CONFIG_STATUS_OFFSET 0x80
+#define CPU_RST_FLAG_VAL 0xFCBA0D10
#define PAD_RETENTION_DRAM_COREBLK_VAL 0x10000000
/* APLL_CON1 */
diff --git a/arch/arm/cpu/armv7/exynos/lowlevel_init.c b/arch/arm/cpu/armv7/exynos/lowlevel_init.c
index 83e1dcf..120aaf8 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) {
diff --git a/arch/arm/cpu/armv7/exynos/sec_boot.S b/arch/arm/cpu/armv7/exynos/sec_boot.S
new file mode 100644
index 0000000..dfc3455
--- /dev/null
+++ b/arch/arm/cpu/armv7/exynos/sec_boot.S
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2013 Samsung Electronics
+ * Akshay Saraswat <akshay.s@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm/arch/cpu.h>
+
+ .globl relocate_wait_code
+relocate_wait_code:
+ adr r0, code_base @ r0: source address (start)
+ adr r1, code_end @ r1: source address (end)
+ ldr r2, =0x02073000 @ r2: target address
+1:
+ ldmia r0!, {r3-r6}
+ stmia r2!, {r3-r6}
+ cmp r0, r1
+ blt 1b
+ b code_end
+ .ltorg
+/*
+ * Secondary core waits here until Primary wake it up.
+ * Below code is copied to CONFIG_EXYNOS_RELOCATE_CODE_BASE.
+ * This is a workaround code which is supposed to act as a
+ * substitute/supplement to the iROM code.
+ *
+ * This workaround code is relocated to the address 0x02073000
+ * because that comes out to be the last 4KB of the iRAM
+ * (Base Address - 0x02020000, Limit Address - 0x020740000).
+ *
+ * U-boot and kernel are aware of this code and flags by the simple
+ * fact that we are implementing a workaround in the last 4KB
+ * of the iRAM and we have already defined these flag and address
+ * values in both kernel and U-boot for our use.
+ */
+code_base:
+ b 1f
+/*
+ * These addresses are being used as flags in u-boot and kernel.
+ *
+ * Jump address for resume and flag to check for resume/reset:
+ * Resume address - 0x2073008
+ * Resume flag - 0x207300C
+ *
+ * Jump address for cluster switching:
+ * Switch address - 0x2073018
+ *
+ * Jump address for core hotplug:
+ * Hotplug address - 0x207301C
+ *
+ * Jump address for C2 state (Reserved for future not being used right now):
+ * C2 address - 0x2073024
+ *
+ * Managed per core status for the active cluster:
+ * CPU0 state - 0x2073028
+ * CPU1 state - 0x207302C
+ * CPU2 state - 0x2073030
+ * CPU3 state - 0x2073034
+ *
+ * Managed per core GIC status for the active cluster:
+ * CPU0 gic state - 0x2073038
+ * CPU1 gic state - 0x207303C
+ * CPU2 gic state - 0x2073040
+ * CPU3 gic state - 0x2073044
+ *
+ * Logic of the code:
+ * Step-1: Read current CPU status.
+ * Step-2: If it's a resume then continue, else jump to step 4.
+ * Step-3: Clear inform1 PMU register and jump to inform0 value.
+ * Step-4: If it's a switch, C2 or reset, get the hotplug address.
+ * Step-5: If address is not available, enter WFE.
+ * Step-6: If address is available, jump to that address.
+ */
+ nop @ for backward compatibility
+ .word 0x0 @ REG0: RESUME_ADDR
+ .word 0x0 @ REG1: RESUME_FLAG
+ .word 0x0 @ REG2
+ .word 0x0 @ REG3
+_switch_addr:
+ .word 0x0 @ REG4: SWITCH_ADDR
+_hotplug_addr:
+ .word 0x0 @ REG5: CPU1_BOOT_REG
+ .word 0x0 @ REG6
+_c2_addr:
+ .word 0x0 @ REG7: REG_C2_ADDR
+_cpu_state:
+ .word 0x1 @ CPU0_STATE : RESET
+ .word 0x2 @ CPU1_STATE : SECONDARY RESET
+ .word 0x2 @ CPU2_STATE : SECONDARY RESET
+ .word 0x2 @ CPU3_STATE : SECONDARY RESET
+_gic_state:
+ .word 0x0 @ CPU0 - GICD_IGROUPR0
+ .word 0x0 @ CPU1 - GICD_IGROUPR0
+ .word 0x0 @ CPU2 - GICD_IGROUPR0
+ .word 0x0 @ CPU3 - GICD_IGROUPR0
+1:
+ adr r0, _cpu_state
+ mrc p15, 0, r7, c0, c0, 5 @ read MPIDR
+ and r7, r7, #0xf @ r7 = cpu id
+/* Read the current cpu state */
+ ldr r10, [r0, r7, lsl #2]
+svc_entry:
+ tst r10, #(1 << 4)
+ adrne r0, _switch_addr
+ bne wait_for_addr
+/* Clear INFORM1 */
+ ldr r0, =(0x10040000 + 0x804)
+ ldr r1, [r0]
+ cmp r1, #0x0
+ movne r1, #0x0
+ strne r1, [r0]
+/* Get INFORM0 */
+ ldrne r1, =(0x10040000 + 0x800)
+ ldrne pc, [r1]
+ tst r10, #(1 << 0)
+ ldrne pc, =0x23e00000
+ adr r0, _hotplug_addr
+wait_for_addr:
+ ldr r1, [r0]
+ cmp r1, #0x0
+ bxne r1
+ wfe
+ b wait_for_addr
+ .ltorg
+code_end:
+ mov pc, lr
diff --git a/arch/arm/cpu/armv7/exynos/soc.c b/arch/arm/cpu/armv7/exynos/soc.c
index 8c7d7d8..0f116b1 100644
--- a/arch/arm/cpu/armv7/exynos/soc.c
+++ b/arch/arm/cpu/armv7/exynos/soc.c
@@ -9,13 +9,6 @@
#include <asm/io.h>
#include <asm/system.h>
-enum l2_cache_params {
- CACHE_TAG_RAM_SETUP = (1 << 9),
- CACHE_DATA_RAM_SETUP = (1 << 5),
- CACHE_TAG_RAM_LATENCY = (2 << 6),
- CACHE_DATA_RAM_LATENCY = (2 << 0)
-};
-
void reset_cpu(ulong addr)
{
writel(0x1, samsung_get_base_swreset());
@@ -28,31 +21,3 @@ void enable_caches(void)
dcache_enable();
}
#endif
-
-#ifndef CONFIG_SYS_L2CACHE_OFF
-/*
- * Set L2 cache parameters
- */
-static void exynos5_set_l2cache_params(void)
-{
- unsigned int val = 0;
-
- asm volatile("mrc p15, 1, %0, c9, c0, 2\n" : "=r"(val));
-
- val |= CACHE_TAG_RAM_SETUP |
- CACHE_DATA_RAM_SETUP |
- CACHE_TAG_RAM_LATENCY |
- CACHE_DATA_RAM_LATENCY;
-
- asm volatile("mcr p15, 1, %0, c9, c0, 2\n" : : "r"(val));
-}
-
-/*
- * Sets L2 cache related parameters before enabling data cache
- */
-void v7_outer_cache_enable(void)
-{
- if (cpu_is_exynos5())
- exynos5_set_l2cache_params();
-}
-#endif