When the entire MPUSS cluster is powered down in device off state, L2 cache memory looses it's content and hence while targetting such a state, l2 cache needs to be flushed to main memory.
Add the necessary low power code support for the same. Signed-off-by: Santosh Shilimkar <[email protected]> --- arch/arm/mach-omap2/omap-secure.h | 1 + arch/arm/mach-omap2/sleep_omap4plus.S | 30 ++++++++++++++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/arch/arm/mach-omap2/omap-secure.h b/arch/arm/mach-omap2/omap-secure.h index 1739468..a171a5a 100644 --- a/arch/arm/mach-omap2/omap-secure.h +++ b/arch/arm/mach-omap2/omap-secure.h @@ -47,6 +47,7 @@ #define OMAP4_MON_L2X0_PREFETCH_INDEX 0x113 #define OMAP5_MON_CACHES_CLEAN_INDEX 0x103 #define OMAP5_MON_AUX_CTRL_INDEX 0x107 +#define OMAP5_MON_L2AUX_CTRL_INDEX 0x104 #define OMAP5_MON_AMBA_IF_INDEX 0x108 diff --git a/arch/arm/mach-omap2/sleep_omap4plus.S b/arch/arm/mach-omap2/sleep_omap4plus.S index f4874e5..ea318be 100644 --- a/arch/arm/mach-omap2/sleep_omap4plus.S +++ b/arch/arm/mach-omap2/sleep_omap4plus.S @@ -386,6 +386,27 @@ skip_secure_l1_clean_op: isb dsb + bl omap4_get_sar_ram_base + mov r8, r0 + mrc p15, 0, r5, c0, c0, 5 @ Read MPIDR + ands r5, r5, #0x0f + ldreq r0, [r8, #L2X0_SAVE_OFFSET0] @ Retrieve L2 state + ldrne r0, [r8, #L2X0_SAVE_OFFSET1] + cmp r0, #3 + bne do_wfi + bl omap4_get_sar_ram_base + ldr r9, [r0, #OMAP_TYPE_OFFSET] + cmp r9, #0x1 @ Check for HS device + bne skip_secure_l2_clean_op + mov r0, #1 @ Clean secure L2 + stmfd r13!, {r4-r12, r14} + ldr r12, =OMAP5_MON_CACHES_CLEAN_INDEX + DO_SMC + ldmfd r13!, {r4-r12, r14} +skip_secure_l2_clean_op: + mov r0, #2 @ Flush L2 + bl v7_flush_dcache_all + do_wfi: bl omap_do_wfi @@ -427,6 +448,15 @@ ENTRY(omap5_cpu_resume) dsb 1: #endif + mrc p15, 1, r0, c15, c0, 0 @ Read L2 ACTLR + cmp r0, #0x118 @ Check if it is already set + beq skip_sec_l2 + ldr r0, =0x118 @ Setup L2 ACTLR = 0x118 + ldr r12, =OMAP5_MON_L2AUX_CTRL_INDEX + dsb + smc #0 + dsb +skip_sec_l2: b cpu_resume @ Jump to generic resume ENDPROC(omap5_cpu_resume) #endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
