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authorNishanth Menon <nm@ti.com>2010-12-20 14:05:06 -0600
committerKevin Hilman <khilman@deeprootsystems.com>2010-12-21 14:45:50 -0800
commit458e999eb14a301d4176783c8fcb277f5d009b4e (patch)
tree7300efdef971f91e4d7601f9bc1174fe9716f313 /arch/arm/mach-omap2/sleep34xx.S
parent8cdfd83473d9b408b924b5d32777ac3fddd251ff (diff)
OMAP3630: PM: Erratum i608: disable RTA
Erratum id: i608 RTA (Retention Till Access) feature is not supported and leads to device stability issues when enabled. This impacts modules with embedded memories on OMAP3630 Workaround is to disable RTA on boot and coming out of core off. For disabling RTA coming out of off mode, we do this by overriding the restore pointer for 3630 as the first point of entry before caches are touched and is common for GP and HS devices. To disable earlier than this could be possible by modifying the PPA for HS devices, but not for GP devices. Cc: Kevin Hilman <khilman@deeprootsystems.com> Cc: Tony Lindgren <tony@atomide.com> Acked-by: Jean Pihet <j-pihet@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> [ambresh@ti.com: co-developer] Signed-off-by: Ambresh K <ambresh@ti.com> Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm/mach-omap2/sleep34xx.S')
-rw-r--r--arch/arm/mach-omap2/sleep34xx.S26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
index 24ecb0a5cce1..4abf447fddfc 100644
--- a/arch/arm/mach-omap2/sleep34xx.S
+++ b/arch/arm/mach-omap2/sleep34xx.S
@@ -45,6 +45,8 @@
#define CM_IDLEST_CKGEN_V OMAP34XX_CM_REGADDR(PLL_MOD, CM_IDLEST)
#define SRAM_BASE_P 0x40200000
#define CONTROL_STAT 0x480022F0
+#define CONTROL_MEM_RTA_CTRL (OMAP343X_CTRL_BASE\
+ + OMAP36XX_CONTROL_MEM_RTA_CTRL)
#define SCRATCHPAD_MEM_OFFS 0x310 /* Move this as correct place is
* available */
#define SCRATCHPAD_BASE_P (OMAP343X_CTRL_BASE + OMAP343X_CONTROL_MEM_WKUP\
@@ -99,6 +101,14 @@ ENTRY(get_restore_pointer)
ldmfd sp!, {pc} @ restore regs and return
ENTRY(get_restore_pointer_sz)
.word . - get_restore_pointer
+ .text
+/* Function call to get the restore pointer for 3630 resume from OFF */
+ENTRY(get_omap3630_restore_pointer)
+ stmfd sp!, {lr} @ save registers on stack
+ adr r0, restore_3630
+ ldmfd sp!, {pc} @ restore regs and return
+ENTRY(get_omap3630_restore_pointer_sz)
+ .word . - get_omap3630_restore_pointer
.text
/* Function call to get the restore pointer for for ES3 to resume from OFF */
@@ -246,6 +256,20 @@ copy_to_sram:
bne copy_to_sram
ldr r1, sram_base
blx r1
+ b restore
+
+restore_3630:
+ /*b restore_es3630*/ @ Enable to debug restore code
+ ldr r1, pm_prepwstst_core_p
+ ldr r2, [r1]
+ and r2, r2, #0x3
+ cmp r2, #0x0 @ Check if previous power state of CORE is OFF
+ bne restore
+ /* Disable RTA before giving control */
+ ldr r1, control_mem_rta
+ mov r2, #OMAP36XX_RTA_DISABLE
+ str r2, [r1]
+ /* Fall thru for the remaining logic */
restore:
/* b restore*/ @ Enable to debug restore code
/* Check what was the reason for mpu reset and store the reason in r9*/
@@ -651,6 +675,8 @@ cache_pred_disable_mask:
.word 0xFFFFE7FB
control_stat:
.word CONTROL_STAT
+control_mem_rta:
+ .word CONTROL_MEM_RTA_CTRL
kernel_flush:
.word v7_flush_dcache_all
/*