arm64: remove ARCH_ARM64_CORTEX_A57_POWER_DOWN_SUPPORT

With the removal of secmon from coreboot there are no
power down operations required. As such remove the
A57 power down support.

Change-Id: I8eebb0ecd87b5e8bb3eaac335d652689d7f57796
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11898
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/arch/arm64/cpu-stubs.c

@@ -14,14 +14,8 @@
  */
 
 void arm64_cpu_early_setup(void);
-void cortex_a57_cpu_power_down(int l2_flush);
 
 void __attribute__((weak)) arm64_cpu_early_setup(void)
 {
 	/* Default empty implementation */
 }
-
-void __attribute__((weak)) cortex_a57_cpu_power_down(int l2_flush)
-{
-	/* Default empty implementation */
-}

src/arch/arm64/cpu/Kconfig

@@ -17,8 +17,3 @@ config ARCH_ARM64_CPU_CORTEX_A57
 	bool
 	default n
 	depends on ARCH_ARM64
-
-config ARCH_ARM64_CORTEX_A57_POWER_DOWN_SUPPORT
-	bool
-	default n
-	depends on ARCH_ARM64 && ARCH_ARM64_CPU_CORTEX_A57

src/arch/arm64/cpu/cortex_a57.S

@@ -14,7 +14,6 @@
  */
 
 #include <arch/asm.h>
-#include <arch/cache_helpers.h>
 #include <cpu/cortex_a57.h>
 
 ENTRY(arm64_cpu_early_setup)
@@ -24,97 +23,3 @@ ENTRY(arm64_cpu_early_setup)
 	isb
 	ret
 ENDPROC(arm64_cpu_early_setup)
-
-/*
- * CPU power down sequence as per A57/A53/A72 TRM
- *
- * x0 - L2 flush by HW(0) or SW(1), if system/HW driven L2 flush is supported
- *
- */
-#if IS_ENABLED(CONFIG_ARCH_ARM64_CORTEX_A57_POWER_DOWN_SUPPORT)
-ENTRY(cortex_a57_cpu_power_down)
-	/* Store L2 cache flush request */
-	mov	x13, x0
-
-	/* 1. Stop allocations to our data cache */
-	mrs	x0, sctlr_el1
-	bic	x0, x0, #1 << 2		// clear SCTLR.C
-	msr	sctlr_el1, x0
-	isb
-
-	mrs	x0, sctlr_el3
-	bic	x0, x0, #1 << 2		// clear SCTLR.C
-	msr	sctlr_el3, x0
-	isb
-
-	mrs	x0, midr_el1
-	ubfx	x0, x0, #4, #12
-	cmp	x0, #CORTEX_A53_PN
-	b.eq	a53
-
-	/* 2. Disable L2 prefetch */
-	mrs	x0, CPUECTLR_EL1	// CPUECTLR_EL1
-	/* CPUECTLR[38], disable table walk descriptor access L2 prefetch */
-	orr	x0, x0, #1 << 38
-	/*
-	 * CPUECTLR[36:35] L2 instruction fetch prefetch distance
-	 * 0 => disable instruction prefetch
-	 */
-	bic	x0, x0, #3 << 35
-	/*
-	 * CPUECTLR[33:32] L2 load/store prefetch distance
-	 * 0 => disable instruction prefetch
-	 */
-	bic	x0, x0, #3 << 32
-	msr	CPUECTLR_EL1, x0
-
-	/* 3. ISB to ensure ectlr write is complete */
-	isb
-
-	/* 4. DSB to ensure prior prefetches are complete */
-	dsb	sy
-
-a53:
-	/* 5. Clean and invalidate L1 and L2 if X13 == 1 */
-	mov	x0, #DCCISW
-	cmp	x13, #1
-	bne	1f
-	bl	flush_dcache_all
-	b	2f
-1:
-	bl	flush_dcache_louis
-2:
-
-	/* 6. Leave coherency, clear SMPEN */
-	mrs	x0, CPUECTLR_EL1
-	bic	x0, x0, #(1 << SMPEN_SHIFT)
-	msr	CPUECTLR_EL1, x0
-
-	/* 7. Set the DBGOSDLR.DLK, Double lock control bit */
-	mrs	x0, osdlr_el1
-	orr	x0, x0, #OSDLR_DBL_LOCK_BIT
-	msr	osdlr_el1, x0
-
-	/*
-	 * 9. Execute an ISB instruction to ensure that all of the
-	 * System register changes from the previous steps have
-	 * been committed.
-	 */
-	isb
-
-	/*
-	 * 10. Execute a DSB instruction to ensure that all
-	 * instruction cache, TLB, and branch predictor
-	 * maintenance operations issued by any processor in the
-	 * multiprocessor before the SMPEN bit was cleared have
-	 * completed.
-	 */
-	dsb	sy
-
-	/* 11. wfi */
-3:	wfi
-
-	/* we never return here */
-	b	3b
-ENDPROC(cortex_a57_cpu_power_down)
-#endif

src/arch/arm64/include/armv8/arch/cpu.h

@@ -183,18 +183,4 @@ void arm64_cpu_startup_resume(void);
  */
 void arm64_arch_timer_init(void);
 
-/*
- * The cortex_a57_cpu_power_down sequence as per A57/A53/A72 TRM.
- * L2 flush by HW(0) or SW(1), if system/HW driven L2 flush is supported.
- */
-#define NO_L2_FLUSH 0
-#define L2_FLUSH_HW 0
-#define L2_FLUSH_SW 1
-
-#if IS_ENABLED(CONFIG_ARCH_ARM64_CORTEX_A57_POWER_DOWN_SUPPORT)
-void cortex_a57_cpu_power_down(int l2_flush);
-#else
-static inline void cortex_a57_cpu_power_down(int l2_flush) {}
-#endif
-
 #endif /* __ARCH_CPU_H__ */

src/soc/nvidia/tegra210/Kconfig

@@ -6,7 +6,6 @@ config SOC_NVIDIA_TEGRA210
 	select ARCH_ROMSTAGE_ARMV4
 	select ARCH_RAMSTAGE_ARMV8_64
 	select ARCH_ARM64_CPU_CORTEX_A57
-	select ARCH_ARM64_CORTEX_A57_POWER_DOWN_SUPPORT
 	select BOOTBLOCK_CONSOLE
 	select GIC
 	select HAVE_MONOTONIC_TIMER