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Diffstat (limited to 'arch/arm/mach-omap2/omap-smp.c')
-rw-r--r--arch/arm/mach-omap2/omap-smp.c48
1 files changed, 43 insertions, 5 deletions
diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index c625cc10d9f9..8cd1de914ee4 100644
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -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