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authorPeter 'p2' De Schrijver <peter.de-schrijver@nokia.com>2010-12-20 14:05:04 -0600
committerKevin Hilman <khilman@deeprootsystems.com>2010-12-21 14:45:49 -0800
commit9d93b8a2c8c78972f0a3d15a820288dbb3968bf2 (patch)
treea48ab8699155f9ba2006ca90699ba8563ae05fce
parent0bd40535365c318e331f5e872030a710d5746167 (diff)
downloadop-kernel-dev-9d93b8a2c8c78972f0a3d15a820288dbb3968bf2.zip
op-kernel-dev-9d93b8a2c8c78972f0a3d15a820288dbb3968bf2.tar.gz
OMAP3: PM: Erratum i581 support: dll kick strategy
Erratum i581 impacts OMAP3 platforms. PRCM DPLL control FSM removes SDRC_IDLEREQ before DPLL3 locks causing the DPLL not to be locked at times. IMPORTANT: *) This is not a complete workaround implementation as recommended by the silicon erratum. This is a support logic for detecting lockups and attempting to recover where possible and is known to provide stability in multiple platforms. *) This code is mostly important for inactive and retention. The ROM code waits for the maximum DLL lock time when resuming from off mode. So for off mode this code isn't really needed. *) counters are introduced here for eventual export to userspace once the cleanups are completed. This should eventually get refactored as part of cleanups to sleep34xx.S Cc: Kevin Hilman <khilman@deeprootsystems.com> Cc: Tony Lindgren <tony@atomide.com> Signed-off-by: Peter 'p2' De Schrijver <peter.de-schrijver@nokia.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
-rw-r--r--arch/arm/mach-omap2/sleep34xx.S55
1 files changed, 50 insertions, 5 deletions
diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
index aa43da5..24ecb0a 100644
--- a/arch/arm/mach-omap2/sleep34xx.S
+++ b/arch/arm/mach-omap2/sleep34xx.S
@@ -42,6 +42,7 @@
OMAP3430_PM_PREPWSTST)
#define PM_PWSTCTRL_MPU_P OMAP3430_PRM_BASE + MPU_MOD + OMAP2_PM_PWSTCTRL
#define CM_IDLEST1_CORE_V OMAP34XX_CM_REGADDR(CORE_MOD, CM_IDLEST1)
+#define CM_IDLEST_CKGEN_V OMAP34XX_CM_REGADDR(PLL_MOD, CM_IDLEST)
#define SRAM_BASE_P 0x40200000
#define CONTROL_STAT 0x480022F0
#define SCRATCHPAD_MEM_OFFS 0x310 /* Move this as correct place is
@@ -555,31 +556,67 @@ skip_l2_inval:
/* Make sure SDRC accesses are ok */
wait_sdrc_ok:
+
+/* DPLL3 must be locked before accessing the SDRC. Maybe the HW ensures this. */
+ ldr r4, cm_idlest_ckgen
+wait_dpll3_lock:
+ ldr r5, [r4]
+ tst r5, #1
+ beq wait_dpll3_lock
+
ldr r4, cm_idlest1_core
+wait_sdrc_ready:
ldr r5, [r4]
- and r5, r5, #0x2
- cmp r5, #0
- bne wait_sdrc_ok
+ tst r5, #0x2
+ bne wait_sdrc_ready
+ /* allow DLL powerdown upon hw idle req */
ldr r4, sdrc_power
ldr r5, [r4]
bic r5, r5, #0x40
str r5, [r4]
-wait_dll_lock:
+is_dll_in_lock_mode:
+
/* Is dll in lock mode? */
ldr r4, sdrc_dlla_ctrl
ldr r5, [r4]
tst r5, #0x4
bxne lr
/* wait till dll locks */
- ldr r4, sdrc_dlla_status
+wait_dll_lock_timed:
+ ldr r4, wait_dll_lock_counter
+ add r4, r4, #1
+ str r4, wait_dll_lock_counter
+ ldr r4, sdrc_dlla_status
+ mov r6, #8 /* Wait 20uS for lock */
+wait_dll_lock:
+ subs r6, r6, #0x1
+ beq kick_dll
ldr r5, [r4]
and r5, r5, #0x4
cmp r5, #0x4
bne wait_dll_lock
bx lr
+ /* disable/reenable DLL if not locked */
+kick_dll:
+ ldr r4, sdrc_dlla_ctrl
+ ldr r5, [r4]
+ mov r6, r5
+ bic r6, #(1<<3) /* disable dll */
+ str r6, [r4]
+ dsb
+ orr r6, r6, #(1<<3) /* enable dll */
+ str r6, [r4]
+ dsb
+ ldr r4, kick_counter
+ add r4, r4, #1
+ str r4, kick_counter
+ b wait_dll_lock_timed
+
cm_idlest1_core:
.word CM_IDLEST1_CORE_V
+cm_idlest_ckgen:
+ .word CM_IDLEST_CKGEN_V
sdrc_dlla_status:
.word SDRC_DLLA_STATUS_V
sdrc_dlla_ctrl:
@@ -616,5 +653,13 @@ control_stat:
.word CONTROL_STAT
kernel_flush:
.word v7_flush_dcache_all
+ /*
+ * When exporting to userspace while the counters are in SRAM,
+ * these 2 words need to be at the end to facilitate retrival!
+ */
+kick_counter:
+ .word 0
+wait_dll_lock_counter:
+ .word 0
ENTRY(omap34xx_cpu_suspend_sz)
.word . - omap34xx_cpu_suspend
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