diff options
| author |   Nishanth Menon <nm@ti.com> | 2010-12-20 14:05:06 -0600 |
|---|---|---|
| committer |   Kevin Hilman <khilman@deeprootsystems.com> | 2010-12-21 14:45:50 -0800 |
| commit | 458e999eb14a301d4176783c8fcb277f5d009b4e (patch) | |
| tree | 7300efdef971f91e4d7601f9bc1174fe9716f313 /arch/arm/mach-omap2/sleep34xx.S | |
| parent | OMAP3: pm: introduce errata handling (diff) | |
| download | linux-dev-458e999eb14a301d4176783c8fcb277f5d009b4e.tar.xz linux-dev-458e999eb14a301d4176783c8fcb277f5d009b4e.zip | |
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.S | 26 |
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 /* |