1 files changed, 78 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/sleep.S b/arch/arm/mach-tegra/sleep.S
index 08e9481c049e..26afa7cbed11 100644
--- a/arch/arm/mach-tegra/sleep.S
+++ b/arch/arm/mach-tegra/sleep.S
@@ -25,9 +25,87 @@
 #include <linux/linkage.h>
 
 #include <asm/assembler.h>
+#include <asm/cache.h>
+#include <asm/cp15.h>
+#include <asm/hardware/cache-l2x0.h>
 
 #include "iomap.h"
 
 #include "flowctrl.h"
 #include "sleep.h"
 
+#ifdef CONFIG_PM_SLEEP
+/*
+ * tegra_disable_clean_inv_dcache
+ *
+ * disable, clean & invalidate the D-cache
+ *
+ * Corrupted registers: r1-r3, r6, r8, r9-r11
+ */
+ENTRY(tegra_disable_clean_inv_dcache)
+	stmfd	sp!, {r0, r4-r5, r7, r9-r11, lr}
+	dmb					@ ensure ordering
+
+	/* Disable the D-cache */
+	mrc	p15, 0, r2, c1, c0, 0
+	bic	r2, r2, #CR_C
+	mcr	p15, 0, r2, c1, c0, 0
+	isb
+
+	/* Flush the D-cache */
+	bl	v7_flush_dcache_louis
+
+	/* Trun off coherency */
+	exit_smp r4, r5
+
+	ldmfd	sp!, {r0, r4-r5, r7, r9-r11, pc}
+ENDPROC(tegra_disable_clean_inv_dcache)
+
+/*
+ * tegra_sleep_cpu_finish(unsigned long v2p)
+ *
+ * enters suspend in LP2 by turning off the mmu and jumping to
+ * tegra?_tear_down_cpu
+ */
+ENTRY(tegra_sleep_cpu_finish)
+	/* Flush and disable the L1 data cache */
+	bl	tegra_disable_clean_inv_dcache
+
+	mov32	r6, tegra_tear_down_cpu
+	ldr	r1, [r6]
+	add	r1, r1, r0
+
+	mov32	r3, tegra_shut_off_mmu
+	add	r3, r3, r0
+	mov	r0, r1
+
+	mov	pc, r3
+ENDPROC(tegra_sleep_cpu_finish)
+
+/*
+ * tegra_shut_off_mmu
+ *
+ * r0 = physical address to jump to with mmu off
+ *
+ * called with VA=PA mapping
+ * turns off MMU, icache, dcache and branch prediction
+ */
+	.align	L1_CACHE_SHIFT
+	.pushsection	.idmap.text, "ax"
+ENTRY(tegra_shut_off_mmu)
+	mrc	p15, 0, r3, c1, c0, 0
+	movw	r2, #CR_I | CR_Z | CR_C | CR_M
+	bic	r3, r3, r2
+	dsb
+	mcr	p15, 0, r3, c1, c0, 0
+	isb
+#ifdef CONFIG_CACHE_L2X0
+	/* Disable L2 cache */
+	mov32	r4, TEGRA_ARM_PERIF_BASE + 0x3000
+	mov	r5, #0
+	str	r5, [r4, #L2X0_CTRL]
+#endif
+	mov	pc, r0
+ENDPROC(tegra_shut_off_mmu)
+	.popsection
+#endif