[PATCHv2 17/19] ARM: OMAP4: put cpu1 back to sleep if no wake request

[Tero Kristo]

If AUX_CORE_BOOT0 does not indicate wakeup request for cpu1, put it back
to off. This is needed during wakeup from device off to prevent cpu1
from being stuck indefinitely in the wakeup loop and also to prevent
wakeup problem on GP chips with device off mode.

Signed-off-by: Tero Kristo <t-kristo at ti.com>
---
 arch/arm/mach-omap2/omap-headsmp.S |   45 ++++++++++++++++++++++++++++++++---
 1 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-omap2/omap-headsmp.S b/arch/arm/mach-omap2/omap-headsmp.S
index d602555..59c6578 100644
--- a/arch/arm/mach-omap2/omap-headsmp.S
+++ b/arch/arm/mach-omap2/omap-headsmp.S
@@ -17,8 +17,37 @@
 
 #include <linux/linkage.h>
 #include <linux/init.h>
+#include <mach/omap-secure.h>
+#include "prcm_mpu44xx.h"
+
+#define CPU1_PWRSTCTRL (OMAP4430_PRCM_MPU_BASE + OMAP4430_PRCM_MPU_CPU1_INST + \
+			OMAP4_PM_CPU1_PWRSTCTRL_OFFSET)
 
 	__CPUINIT
+
+ENTRY(omap_cpu1_off)
+	ldr	r12, =CPU1_PWRSTCTRL
+	ldr	r0, [r12]
+	and	r0, #3
+	cmp	r0, #2
+	beq	exit_cpu1_off
+
+	mov	r0, #0x3
+	mov	r1, #0x0
+	ldr	r12, =OMAP4_MON_SCU_PWR_INDEX
+	dsb
+	smc     #0
+
+	isb
+	dsb
+	dmb
+	wfi
+	nop
+	nop
+exit_cpu1_off:
+	mov	pc, lr
+ENDPROC(omap_cpu1_off)
+
 /*
  * OMAP4 specific entry point for secondary CPU to jump from ROM
  * code.  This routine also provides a holding flag into which
@@ -27,32 +56,40 @@
  * register AuxCoreBoot0.
  */
 ENTRY(omap_secondary_startup)
-hold:	ldr	r12,=0x103
+	ldr	r12,=0x103
 	dsb
 	smc	#0			@ read from AuxCoreBoot0
 	mov	r0, r0, lsr #9
 	mrc	p15, 0, r4, c0, c0, 5
 	and	r4, r4, #0x0f
 	cmp	r0, r4
-	bne	hold
+	beq	omap_cont_boot
+
+	bl	omap_cpu1_off
+	b	omap_secondary_startup
 
 	/*
 	 * we've been released from the wait loop,secondary_stack
 	 * should now contain the SVC stack for this core
 	 */
+omap_cont_boot:
 	b	secondary_startup
 ENDPROC(omap_secondary_startup)
 
 ENTRY(omap_secondary_startup_4460)
-hold_2:	ldr	r12,=0x103
+	ldr	r12,=0x103
 	dsb
 	smc	#0			@ read from AuxCoreBoot0
 	mov	r0, r0, lsr #9
 	mrc	p15, 0, r4, c0, c0, 5
 	and	r4, r4, #0x0f
 	cmp	r0, r4
-	bne	hold_2
+	beq	omap4460_cont_boot
+
+	bl	omap_cpu1_off
+	b	omap_secondary_startup_4460
 
+omap4460_cont_boot:
 	/*
 	 * GIC distributor control register has changed between
 	 * CortexA9 r1pX and r2pX. The Control Register secure
-- 
1.7.4.1