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Merge commit 'c0053bd50af5' into omap-for-v4.8/soc

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This commit is contained in:
Tony Lindgren 2016-06-22 22:55:18 -07:00
parent 218092afa0 c0053bd50a
commit 99eb45f98c
3 changed files with 52 additions and 5 deletions
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8
arch/arm/mach-omap2/Kconfig
View file

@ -240,4 +240,12 @@ endmenu
endif
config OMAP5_ERRATA_801819
bool "Errata 801819: An eviction from L1 data cache might stall indefinitely"
depends on SOC_OMAP5 || SOC_DRA7XX
help
A livelock can occur in the L2 cache arbitration that might prevent
a snoop from completing. Under certain conditions this can cause the
system to deadlock.
endmenu

1
arch/arm/mach-omap2/omap-secure.h
View file

@ -46,6 +46,7 @@
#define OMAP5_DRA7_MON_SET_CNTFRQ_INDEX 0x109
#define OMAP5_MON_AMBA_IF_INDEX 0x108
#define OMAP5_DRA7_MON_SET_ACR_INDEX 0x107
/* Secure PPA(Primary Protected Application) APIs */
#define OMAP4_PPA_L2_POR_INDEX 0x23

48
arch/arm/mach-omap2/omap-smp.c
View file

@ -50,6 +50,39 @@ void __iomem *omap4_get_scu_base(void)
return scu_base;
}
#ifdef CONFIG_OMAP5_ERRATA_801819
void omap5_erratum_workaround_801819(void)
{
u32 acr, revidr;
u32 acr_mask;
/* REVIDR[3] indicates erratum fix available on silicon */
asm volatile ("mrc p15, 0, %0, c0, c0, 6" : "=r" (revidr));
if (revidr & (0x1 << 3))
return;
asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
/*
* BIT(27) - Disables streaming. All write-allocate lines allocate in
* the L1 or L2 cache.
* BIT(25) - Disables streaming. All write-allocate lines allocate in
* the L1 cache.
*/
acr_mask = (0x3 << 25) | (0x3 << 27);
/* do we already have it done.. if yes, skip expensive smc */
if ((acr & acr_mask) == acr_mask)
return;
acr |= acr_mask;
omap_smc1(OMAP5_DRA7_MON_SET_ACR_INDEX, acr);
pr_debug("%s: ARM erratum workaround 801819 applied on CPU%d\n",
__func__, smp_processor_id());
}
#else
static inline void omap5_erratum_workaround_801819(void) { }
#endif
static void omap4_secondary_init(unsigned int cpu)
{
/*
@ -64,12 +97,15 @@ static void omap4_secondary_init(unsigned int cpu)
omap_secure_dispatcher(OMAP4_PPA_CPU_ACTRL_SMP_INDEX,
4, 0, 0, 0, 0, 0);
/*
* Configure the CNTFRQ register for the secondary cpu's which
* indicates the frequency of the cpu local timers.
*/
if (soc_is_omap54xx() || soc_is_dra7xx())
if (soc_is_omap54xx() || soc_is_dra7xx()) {
/*
* Configure the CNTFRQ register for the secondary cpu's which
* indicates the frequency of the cpu local timers.
*/
set_cntfreq();
/* Configure ACR to disable streaming WA for 801819 */
omap5_erratum_workaround_801819();
}
/*
* Synchronise with the boot thread.
@ -218,6 +254,8 @@ static void __init omap4_smp_prepare_cpus(unsigned int max_cpus)
if (cpu_is_omap446x())
startup_addr = omap4460_secondary_startup;
if (soc_is_dra74x() || soc_is_omap54xx())
omap5_erratum_workaround_801819();
/*
* Write the address of secondary startup routine into the