> -----Original Message----- > From: linux-omap-ow...@vger.kernel.org [mailto:linux-omap- > ow...@vger.kernel.org] On Behalf Of Nishanth Menon > Sent: Sunday, December 19, 2010 4:24 AM > To: linux-omap; linux-arm > Cc: Jean Pihet; Kevin; Tony > Subject: [PATCH v4 5/7] OMAP3630: PM: Disable L2 cache while invalidating > L2 cache > > From: Peter 'p2' De Schrijver <peter.de-schrij...@nokia.com> > > This disables L2 cache before invalidating it and reenables it afterwards. > This is be done according to ARM documentation. Currently this is > identified > as being needed on OMAP3630 as the disable/enable is done from "public > side" > while, on OMAP3430, this is done in the "secure side". Can you point me to ARM doc which says " for L2 invalidation, the controller needs to be disabled" ? L2 invalidation can be done with L2 enabled or disabled. Infact if I look at below code, effective $L2 will get enabled only when 'C' bit is enabled it shouldn't matter really.
After looking further I guess it might be needed because L2AUXCTRL Configuration is getting changed. In that case for sure the sequence used here is right. > > Cc: Kevin Hilman <khil...@deeprootsystems.com> > Cc: Tony Lindgren <t...@atomide.com> > > [...@ti.com: ported to 2.6.37-rc2, added hooks to enable the logic only on > 3630] > Signed-off-by: Nishanth Menon <n...@ti.com> > Signed-off-by: Eduardo Valentin <eduardo.valen...@nokia.com> > Signed-off-by: Peter 'p2' De Schrijver <peter.de-schrij...@nokia.com> > --- As such patch is fine with me. > v4: rebased only. no functional change > v3: http://marc.info/?l=linux-omap&m=129139583519221&w=2 > collate all silicon specific errata under a single cpu detection code > making it elegant and more maintainable. > v2: https://patchwork.kernel.org/patch/365232/ > rebased out to this series independent of HS bugfixes > v1: http://marc.info/?l=linux-omap&m=129013171125204&w=2 > > arch/arm/mach-omap2/pm.h | 2 ++ > arch/arm/mach-omap2/pm34xx.c | 5 ++++- > arch/arm/mach-omap2/sleep34xx.S | 30 ++++++++++++++++++++++++++++++ > 3 files changed, 36 insertions(+), 1 deletions(-) > > diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h > index 8d9aa3e..5e0bee9 100644 > --- a/arch/arm/mach-omap2/pm.h > +++ b/arch/arm/mach-omap2/pm.h > @@ -90,8 +90,10 @@ extern unsigned int omap34xx_cpu_suspend_sz; > #if defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3) > extern u16 pm34xx_errata; > #define IS_PM34XX_ERRATUM(id) (pm34xx_errata & (id)) > +extern void enable_omap3630_toggle_l2_on_restore(void); > #else > #define IS_PM34XX_ERRATUM(id) 0 > +static inline void enable_omap3630_toggle_l2_on_restore(void) { } > #endif /* defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3) */ > > #endif > diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c > index b32a2ed..4ba7a06 100644 > --- a/arch/arm/mach-omap2/pm34xx.c > +++ b/arch/arm/mach-omap2/pm34xx.c > @@ -1007,8 +1007,11 @@ void omap_push_sram_idle(void) > > static void __init pm_errata_configure(void) > { > - if (cpu_is_omap3630()) > + if (cpu_is_omap3630()) { > pm34xx_errata |= PM_RTA_ERRATUM_i608; > + /* Enable the l2 cache toggling in sleep logic */ > + enable_omap3630_toggle_l2_on_restore(); > + } > } > > static int __init omap3_pm_init(void) > diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach- > omap2/sleep34xx.S > index cc3507b..d2eda01 100644 > --- a/arch/arm/mach-omap2/sleep34xx.S > +++ b/arch/arm/mach-omap2/sleep34xx.S > @@ -111,6 +111,19 @@ ENTRY(get_omap3630_restore_pointer_sz) > .word . - get_omap3630_restore_pointer > > .text > +/* > + * L2 cache needs to be toggled for stable OFF mode functionality on 3630. > + * This function sets up a fflag that will allow for this toggling to > take > + * place on 3630. Hopefully some version in the future maynot need this > + */ > +ENTRY(enable_omap3630_toggle_l2_on_restore) > + stmfd sp!, {lr} @ save registers on stack > + /* Setup so that we will disable and enable l2 */ > + mov r1, #0x1 > + str r1, l2dis_3630 > + ldmfd sp!, {pc} @ restore regs and return > + > + .text > /* Function call to get the restore pointer for for ES3 to resume from > OFF */ > ENTRY(get_es3_restore_pointer) > stmfd sp!, {lr} @ save registers on stack > @@ -283,6 +296,14 @@ restore: > moveq r9, #0x3 @ MPU OFF => L1 and L2 lost > movne r9, #0x1 @ Only L1 and L2 lost => avoid L2 invalidation > bne logic_l1_restore > + > + ldr r0, l2dis_3630 > + cmp r0, #0x1 @ should we disable L2 on 3630? > + bne skipl2dis > + mrc p15, 0, r0, c1, c0, 1 > + bic r0, r0, #2 @ disable L2 cache > + mcr p15, 0, r0, c1, c0, 1 > +skipl2dis: > ldr r0, control_stat > ldr r1, [r0] > and r1, #0x700 > @@ -343,6 +364,13 @@ smi: .word 0xE1600070 @ Call SMI monitor > (smieq) > mov r12, #0x2 > .word 0xE1600070 @ Call SMI monitor (smieq) > logic_l1_restore: > + ldr r1, l2dis_3630 > + cmp r1, #0x1 @ Do we need to re-enable L2 on 3630? > + bne skipl2reen > + mrc p15, 0, r1, c1, c0, 1 > + orr r1, r1, #2 @ re-enable L2 cache > + mcr p15, 0, r1, c1, c0, 1 > +skipl2reen: > mov r1, #0 > /* Invalidate all instruction caches to PoU > * and flush branch target cache */ > @@ -678,6 +706,8 @@ control_mem_rta: > .word CONTROL_MEM_RTA_CTRL > kernel_flush: > .word v7_flush_dcache_all > +l2dis_3630: > + .word 0 > /* these 2 words need to be at the end !!! */ > kick_counter: > .word 0 > -- > 1.6.3.3 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
