Santosh Shilimkar <santosh.shilimkar@xxxxxx> writes:
> 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.
>
> Acked-by: Nishanth Menon <nm@xxxxxx>
> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
> ---
> arch/arm/mach-omap2/omap-secure.h | 1 +
> arch/arm/mach-omap2/sleep_omap4plus.S | 21 +++++++++++++++++++++
> 2 files changed, 22 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
this #define is not used in this patch.
Kevin
> #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 4a5e2e4..288f62f 100644
> --- a/arch/arm/mach-omap2/sleep_omap4plus.S
> +++ b/arch/arm/mach-omap2/sleep_omap4plus.S
> @@ -337,6 +337,7 @@ ENDPROC(omap4_cpu_resume)
> * 0 - Nothing lost and no need to save: MPUSS INA/CSWR
> * 1 - CPUx L1 and logic lost: CPU OFF, MPUSS INA/CSWR
> * 2 - CPUx L1 and logic lost + GIC lost: MPUSS OSWR
> + * 3 - CPUx L1 and logic lost + GIC,L2 lost: MPU OSWR & L2 lost(debug only)
> */
> ENTRY(omap5_finish_suspend)
> stmfd sp!, {r4-r12, lr}
> @@ -391,6 +392,26 @@ 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:
> + bl v7_flush_dcache_all
> +
> do_wfi:
> bl omap_do_wfi
--
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