Merge branch 'master' of git://git.denx.de/u-boot-samsung

9 files changed, 479 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
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..3ffb296 100644
--- a/arch/arm/include/asm/arch-exynos/system.h
+++ b/arch/arm/include/asm/arch-exynos/system.h
@@ -37,6 +37,94 @@ struct exynos5_sysreg {
 
 #define USB20_PHY_CFG_HOST_LINK_EN	(1 << 0)
 
+/*
+ * 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))
+
+/* Branch to the given location */
+#define branch_bx(x) __asm__ __volatile__ ("bx	%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))
+
 void set_usbhost_mode(unsigned int mode);
 void set_system_display_ctrl(void);
 int exynos_lcd_early_init(const void *blob);
diff --git a/arch/arm/include/asm/armv7.h b/arch/arm/include/asm/armv7.h
index a13da23..dc9561c 100644
--- a/arch/arm/include/asm/armv7.h
+++ b/arch/arm/include/asm/armv7.h
@@ -69,6 +69,50 @@
 #define CP15DSB	asm volatile ("mcr     p15, 0, %0, c7, c10, 4" : : "r" (0))
 #define CP15DMB	asm volatile ("mcr     p15, 0, %0, c7, c10, 5" : : "r" (0))
 
+/*
+ * Workaround for ARM errata # 798870
+ * Set L2ACTLR[7] to reissue any memory transaction in the L2 that has been
+ * stalled for 1024 cycles to verify that its hazard condition still exists.
+ */
+static inline void v7_enable_l2_hazard_detect(void)
+{
+	uint32_t val;
+
+	/* L2ACTLR[7]: Enable hazard detect timeout */
+	asm volatile ("mrc     p15, 1, %0, c15, c0, 0\n\t" : "=r"(val));
+	val |= (1 << 7);
+	asm volatile ("mcr     p15, 1, %0, c15, c0, 0\n\t" : : "r"(val));
+}
+
+/*
+ * Workaround for ARM errata # 799270
+ * Ensure that the L2 logic has been used within the previous 256 cycles
+ * before modifying the ACTLR.SMP bit. This is required during boot before
+ * MMU has been enabled, or during a specified reset or power down sequence.
+ */
+static inline void v7_enable_smp(uint32_t address)
+{
+	uint32_t temp, val;
+
+	/* Read auxiliary control register */
+	asm volatile ("mrc     p15, 0, %0, c1, c0, 1\n\t" : "=r"(val));
+
+	/* Enable SMP */
+	val |= (1 << 6);
+
+	/* Dummy read to assure L2 access */
+	temp = readl(address);
+	temp &= 0;
+	val |= temp;
+
+	/* Write auxiliary control register */
+	asm volatile ("mcr     p15, 0, %0, c1, c0, 1\n\t" : : "r"(val));
+
+	CP15DSB;
+	CP15ISB;
+}
+
+void v7_en_l2_hazard_detect(void);
 void v7_outer_cache_enable(void);
 void v7_outer_cache_disable(void);
 void v7_outer_cache_flush_all(void);