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authorRussell King <rmk+kernel@arm.linux.org.uk>2014-03-15 19:08:11 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-05-30 00:48:19 +0100
commitebd4219f10fbe3938cd36443e240eb6076b811ab (patch)
treeb5f33dcf501072d11a593962ef7b70b88db2b1cb /arch/arm/mm/cache-l2x0.c
parent99ca1772e52d8825172100a24e461a0ffe11e125 (diff)
downloadlinux-stericsson-ebd4219f10fbe3938cd36443e240eb6076b811ab.tar.gz
ARM: l2c: implement L2C-310 erratum 588369 as a method override
Implement L2C-310 erratum 588369 by overriding the invalidate range and flush range methods in the outer_cache operations structure. This allows us to sensibly contain the erratum code in one place without affecting other locations/implemetations. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/cache-l2x0.c')
-rw-r--r--arch/arm/mm/cache-l2x0.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 6161232c8a85..79ff08db204d 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -522,6 +522,65 @@ static void l2c310_set_debug(unsigned long val)
writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL);
}
+static void l2c310_inv_range_erratum(unsigned long start, unsigned long end)
+{
+ void __iomem *base = l2x0_base;
+
+ if ((start | end) & (CACHE_LINE_SIZE - 1)) {
+ unsigned long flags;
+
+ /* Erratum 588369 for both clean+invalidate operations */
+ raw_spin_lock_irqsave(&l2x0_lock, flags);
+ l2c_set_debug(base, 0x03);
+
+ if (start & (CACHE_LINE_SIZE - 1)) {
+ start &= ~(CACHE_LINE_SIZE - 1);
+ writel_relaxed(start, base + L2X0_CLEAN_LINE_PA);
+ writel_relaxed(start, base + L2X0_INV_LINE_PA);
+ start += CACHE_LINE_SIZE;
+ }
+
+ if (end & (CACHE_LINE_SIZE - 1)) {
+ end &= ~(CACHE_LINE_SIZE - 1);
+ writel_relaxed(end, base + L2X0_CLEAN_LINE_PA);
+ writel_relaxed(end, base + L2X0_INV_LINE_PA);
+ }
+
+ l2c_set_debug(base, 0x00);
+ raw_spin_unlock_irqrestore(&l2x0_lock, flags);
+ }
+
+ __l2c210_op_pa_range(base + L2X0_INV_LINE_PA, start, end);
+ __l2c210_cache_sync(base);
+}
+
+static void l2c310_flush_range_erratum(unsigned long start, unsigned long end)
+{
+ raw_spinlock_t *lock = &l2x0_lock;
+ unsigned long flags;
+ void __iomem *base = l2x0_base;
+
+ raw_spin_lock_irqsave(lock, flags);
+ while (start < end) {
+ unsigned long blk_end = start + min(end - start, 4096UL);
+
+ l2c_set_debug(base, 0x03);
+ while (start < blk_end) {
+ writel_relaxed(start, base + L2X0_CLEAN_LINE_PA);
+ writel_relaxed(start, base + L2X0_INV_LINE_PA);
+ start += CACHE_LINE_SIZE;
+ }
+ l2c_set_debug(base, 0x00);
+
+ if (blk_end < end) {
+ raw_spin_unlock_irqrestore(lock, flags);
+ raw_spin_lock_irqsave(lock, flags);
+ }
+ }
+ raw_spin_unlock_irqrestore(lock, flags);
+ __l2c210_cache_sync(base);
+}
+
static void l2c310_flush_all_erratum(void)
{
void __iomem *base = l2x0_base;
@@ -600,9 +659,19 @@ static void __init l2c310_fixup(void __iomem *base, u32 cache_id,
const char *errata[4];
unsigned n = 0;
+ /* For compatibility */
if (revision <= L310_CACHE_ID_RTL_R3P0)
fns->set_debug = l2c310_set_debug;
+ if (IS_ENABLED(CONFIG_PL310_ERRATA_588369) &&
+ revision < L310_CACHE_ID_RTL_R2P0 &&
+ /* For bcm compatibility */
+ fns->inv_range == l2x0_inv_range) {
+ fns->inv_range = l2c310_inv_range_erratum;
+ fns->flush_range = l2c310_flush_range_erratum;
+ errata[n++] = "588369";
+ }
+
if (IS_ENABLED(CONFIG_PL310_ERRATA_727915) &&
revision >= L310_CACHE_ID_RTL_R2P0 &&
revision < L310_CACHE_ID_RTL_R3P1) {