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authorWill Deacon <will.deacon@arm.com>2012-04-20 17:22:11 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-12 09:32:22 -0700
commitf3d426d5b791e91a0c515ac8f9dbf9e16dc439e6 (patch)
tree136e8f3a690154bae0f7ec39fbc0017779e0a91b
parentc2fa9282ae75212b61077b274bf69d89890362e5 (diff)
ARM: 7398/1: l2x0: only write to debug registers on PL310
commit ab4d536890853ab6675ede65db40e2c0980cb0ea upstream. PL310 errata #588369 and #727915 require writes to the debug registers of the cache controller to work around known problems. Writing these registers on L220 may cause deadlock, so ensure that we only perform this operation when we identify a PL310 at probe time. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/arm/mm/cache-l2x0.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 971d52749afd..db7bcc078006 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -81,10 +81,13 @@ static inline void l2x0_inv_line(unsigned long addr)
}
#if defined(CONFIG_PL310_ERRATA_588369) || defined(CONFIG_PL310_ERRATA_727915)
+static inline void debug_writel(unsigned long val)
+{
+ if (outer_cache.set_debug)
+ outer_cache.set_debug(val);
+}
-#define debug_writel(val) outer_cache.set_debug(val)
-
-static void l2x0_set_debug(unsigned long val)
+static void pl310_set_debug(unsigned long val)
{
writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL);
}
@@ -94,7 +97,7 @@ static inline void debug_writel(unsigned long val)
{
}
-#define l2x0_set_debug NULL
+#define pl310_set_debug NULL
#endif
#ifdef CONFIG_PL310_ERRATA_588369
@@ -331,6 +334,7 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
/* Unmapped register. */
sync_reg_offset = L2X0_DUMMY_REG;
#endif
+ outer_cache.set_debug = pl310_set_debug;
break;
case L2X0_CACHE_ID_PART_L210:
ways = (aux >> 13) & 0xf;
@@ -379,7 +383,6 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
outer_cache.flush_all = l2x0_flush_all;
outer_cache.inv_all = l2x0_inv_all;
outer_cache.disable = l2x0_disable;
- outer_cache.set_debug = l2x0_set_debug;
printk(KERN_INFO "%s cache controller enabled\n", type);
printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d B\n",