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author | Akshay Saraswat <akshay.s@samsung.com> | 2015-02-20 13:27:12 +0530 |
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committer | Minkyu Kang <mk7.kang@samsung.com> | 2015-02-28 18:03:46 +0900 |
commit | ac0d98cd557e0939bd0f10ff68e2e648a74bbea6 (patch) | |
tree | ff8fee5d3b87261254d1fea5f3c4461b47f984f8 /arch/arm/include/asm/arch-exynos | |
parent | 1a8aae9b946d707d5dd2b1616e9c9c80c3daf178 (diff) | |
download | u-boot-imx-ac0d98cd557e0939bd0f10ff68e2e648a74bbea6.zip u-boot-imx-ac0d98cd557e0939bd0f10ff68e2e648a74bbea6.tar.gz u-boot-imx-ac0d98cd557e0939bd0f10ff68e2e648a74bbea6.tar.bz2 |
Exynos542x: CPU: Power down all secondary cores
This patch adds code to shutdown secondary cores.
When U-boot comes up, all secondary cores appear powered on,
which is undesirable and causes side effects while
initializing these cores in kernel.
Secondary core power down happens in following steps:
Step-1: After Exynos power-on, primary core starts executing first.
Step-2: In iROM code every core has to check 2 flags i.e.
addresses 0x02020028 & 0x02020004.
Step-3: Initially 0x02020028 is 0 for all cores and 0x02020004 has a
jump address for primary core and 0 for all secondary cores.
Step-4: Therefore, primary core follows normal iROM execution and jumps
to BL1 eventually, whereas all secondary cores enter WFE.
Step-5: When primary core comes into function secondary_cores_configure,
it puts pointer to function power_down_core into 0x02020004
and provides DSB and SEV for all cores so that they may come out
of WFE and jump to power_down_core function.
Step-6: And ultimately because of power_down_core all
secondary cores shut-down.
Signed-off-by: Kimoon Kim <kimoon.kim@samsung.com>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Diffstat (limited to 'arch/arm/include/asm/arch-exynos')
-rw-r--r-- | arch/arm/include/asm/arch-exynos/cpu.h | 5 | ||||
-rw-r--r-- | arch/arm/include/asm/arch-exynos/system.h | 87 |
2 files changed, 92 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-exynos/cpu.h b/arch/arm/include/asm/arch-exynos/cpu.h index 29674ad..e739520 100644 --- a/arch/arm/include/asm/arch-exynos/cpu.h +++ b/arch/arm/include/asm/arch-exynos/cpu.h @@ -153,6 +153,10 @@ #define EXYNOS5420_CLOCK_BASE 0x10010000 #define EXYNOS5420_POWER_BASE 0x10040000 #define EXYNOS5420_SWRESET 0x10040400 +#define EXYNOS5420_INFORM_BASE 0x10040800 +#define EXYNOS5420_SPARE_BASE 0x10040900 +#define EXYNOS5420_CPU_CONFIG_BASE 0x10042000 +#define EXYNOS5420_CPU_STATUS_BASE 0x10042004 #define EXYNOS5420_SYSREG_BASE 0x10050000 #define EXYNOS5420_TZPC_BASE 0x100E0000 #define EXYNOS5420_WATCHDOG_BASE 0x101D0000 @@ -186,6 +190,7 @@ #define EXYNOS5420_USB3PHY_BASE DEVICE_NOT_AVAILABLE #define EXYNOS5420_USB_HOST_XHCI_BASE DEVICE_NOT_AVAILABLE + #ifndef __ASSEMBLY__ #include <asm/io.h> /* CPU detection macros */ diff --git a/arch/arm/include/asm/arch-exynos/system.h b/arch/arm/include/asm/arch-exynos/system.h index 4968d3d..86903c3 100644 --- a/arch/arm/include/asm/arch-exynos/system.h +++ b/arch/arm/include/asm/arch-exynos/system.h @@ -37,6 +37,93 @@ struct exynos5_sysreg { #define USB20_PHY_CFG_HOST_LINK_EN (1 << 0) +#ifdef CONFIG_EXYNOS5420 +/* + * Data Synchronization Barrier acts as a special kind of memory barrier. + * No instruction in program order after this instruction executes until + * this instruction completes. This instruction completes when: + * - All explicit memory accesses before this instruction complete. + * - All Cache, Branch predictor and TLB maintenance operations before + * this instruction complete. + */ +#define dsb() __asm__ __volatile__ ("dsb\n\t" : : ); + +/* + * This instruction causes an event to be signaled to all cores + * within a multiprocessor system. If SEV is implemented, + * WFE must also be implemented. + */ +#define sev() __asm__ __volatile__ ("sev\n\t" : : ); +/* + * If the Event Register is not set, WFE suspends execution until + * one of the following events occurs: + * - an IRQ interrupt, unless masked by the CPSR I-bit + * - an FIQ interrupt, unless masked by the CPSR F-bit + * - an Imprecise Data abort, unless masked by the CPSR A-bit + * - a Debug Entry request, if Debug is enabled + * - an Event signaled by another processor using the SEV instruction. + * If the Event Register is set, WFE clears it and returns immediately. + * If WFE is implemented, SEV must also be implemented. + */ +#define wfe() __asm__ __volatile__ ("wfe\n\t" : : ); + +/* Move 0xd3 value to CPSR register to enable SVC mode */ +#define svc32_mode_en() __asm__ __volatile__ \ + ("@ I&F disable, Mode: 0x13 - SVC\n\t" \ + "msr cpsr_c, #0x13|0xC0\n\t" : : ) + +/* Set program counter with the given value */ +#define set_pc(x) __asm__ __volatile__ ("mov pc, %0\n\t" : : "r"(x)) + +/* Read Main Id register */ +#define mrc_midr(x) __asm__ __volatile__ \ + ("mrc p15, 0, %0, c0, c0, 0\n\t" : "=r"(x) : ) + +/* Read Multiprocessor Affinity Register */ +#define mrc_mpafr(x) __asm__ __volatile__ \ + ("mrc p15, 0, %0, c0, c0, 5\n\t" : "=r"(x) : ) + +/* Read System Control Register */ +#define mrc_sctlr(x) __asm__ __volatile__ \ + ("mrc p15, 0, %0, c1, c0, 0\n\t" : "=r"(x) : ) + +/* Read Auxiliary Control Register */ +#define mrc_auxr(x) __asm__ __volatile__ \ + ("mrc p15, 0, %0, c1, c0, 1\n\t" : "=r"(x) : ) + +/* Read L2 Control register */ +#define mrc_l2_ctlr(x) __asm__ __volatile__ \ + ("mrc p15, 1, %0, c9, c0, 2\n\t" : "=r"(x) : ) + +/* Read L2 Auxilliary Control register */ +#define mrc_l2_aux_ctlr(x) __asm__ __volatile__ \ + ("mrc p15, 1, %0, c15, c0, 0\n\t" : "=r"(x) : ) + +/* Write System Control Register */ +#define mcr_sctlr(x) __asm__ __volatile__ \ + ("mcr p15, 0, %0, c1, c0, 0\n\t" : : "r"(x)) + +/* Write Auxiliary Control Register */ +#define mcr_auxr(x) __asm__ __volatile__ \ + ("mcr p15, 0, %0, c1, c0, 1\n\t" : : "r"(x)) + +/* Invalidate all instruction caches to PoU */ +#define mcr_icache(x) __asm__ __volatile__ \ + ("mcr p15, 0, %0, c7, c5, 0\n\t" : : "r"(x)) + +/* Invalidate unified TLB */ +#define mcr_tlb(x) __asm__ __volatile__ \ + ("mcr p15, 0, %0, c8, c7, 0\n\t" : : "r"(x)) + +/* Write L2 Control register */ +#define mcr_l2_ctlr(x) __asm__ __volatile__ \ + ("mcr p15, 1, %0, c9, c0, 2\n\t" : : "r"(x)) + +/* Write L2 Auxilliary Control register */ +#define mcr_l2_aux_ctlr(x) __asm__ __volatile__ \ + ("mcr p15, 1, %0, c15, c0, 0\n\t" : : "r"(x)) +#endif + void set_usbhost_mode(unsigned int mode); void set_system_display_ctrl(void); int exynos_lcd_early_init(const void *blob); |