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Diffstat (limited to 'target/linux/bcm53xx/patches-4.1/073-ARM-l2c-only-unlock-caches-if-NS_LOCKDOWN-bit-is-set.patch')
-rw-r--r--target/linux/bcm53xx/patches-4.1/073-ARM-l2c-only-unlock-caches-if-NS_LOCKDOWN-bit-is-set.patch149
1 files changed, 149 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-4.1/073-ARM-l2c-only-unlock-caches-if-NS_LOCKDOWN-bit-is-set.patch b/target/linux/bcm53xx/patches-4.1/073-ARM-l2c-only-unlock-caches-if-NS_LOCKDOWN-bit-is-set.patch
new file mode 100644
index 0000000000..852dd028d7
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.1/073-ARM-l2c-only-unlock-caches-if-NS_LOCKDOWN-bit-is-set.patch
@@ -0,0 +1,149 @@
+From e946a8cbe4a47a7c2615ffb0d45712e72c7d0f3a Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@arm.linux.org.uk>
+Date: Fri, 15 May 2015 11:51:51 +0100
+Subject: [PATCH 73/74] ARM: l2c: only unlock caches if NS_LOCKDOWN bit is set
+
+Some L2C caches have a bit which allows non-secure software to control
+the cache lockdown. Some platforms are unable to set this bit. To
+avoid receiving an abort while trying to unlock the cache lines, check
+the state of this bit before unlocking. We do this by providing a new
+method in the l2c_init_data to perform the unlocking.
+
+Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
+---
+ arch/arm/mm/cache-l2x0.c | 26 +++++++++++++++++++++++++-
+ 1 file changed, 25 insertions(+), 1 deletion(-)
+
+--- a/arch/arm/mm/cache-l2x0.c
++++ b/arch/arm/mm/cache-l2x0.c
+@@ -42,6 +42,7 @@ struct l2c_init_data {
+ void (*fixup)(void __iomem *, u32, struct outer_cache_fns *);
+ void (*save)(void __iomem *);
+ void (*configure)(void __iomem *);
++ void (*unlock)(void __iomem *, unsigned);
+ struct outer_cache_fns outer_cache;
+ };
+
+@@ -128,7 +129,7 @@ static void l2c_enable(void __iomem *bas
+ else
+ l2x0_data->configure(base);
+
+- l2c_unlock(base, num_lock);
++ l2x0_data->unlock(base, num_lock);
+
+ local_irq_save(flags);
+ __l2c_op_way(base + L2X0_INV_WAY);
+@@ -249,6 +250,7 @@ static const struct l2c_init_data l2c210
+ .enable = l2c_enable,
+ .save = l2c_save,
+ .configure = l2c_configure,
++ .unlock = l2c_unlock,
+ .outer_cache = {
+ .inv_range = l2c210_inv_range,
+ .clean_range = l2c210_clean_range,
+@@ -400,6 +402,12 @@ static void l2c220_enable(void __iomem *
+ l2c_enable(base, aux, num_lock);
+ }
+
++static void l2c220_unlock(void __iomem *base, unsigned num_lock)
++{
++ if (readl_relaxed(base + L2X0_AUX_CTRL) & L220_AUX_CTRL_NS_LOCKDOWN)
++ l2c_unlock(base, num_lock);
++}
++
+ static const struct l2c_init_data l2c220_data = {
+ .type = "L2C-220",
+ .way_size_0 = SZ_8K,
+@@ -407,6 +415,7 @@ static const struct l2c_init_data l2c220
+ .enable = l2c220_enable,
+ .save = l2c_save,
+ .configure = l2c_configure,
++ .unlock = l2c220_unlock,
+ .outer_cache = {
+ .inv_range = l2c220_inv_range,
+ .clean_range = l2c220_clean_range,
+@@ -755,6 +764,12 @@ static void l2c310_resume(void)
+ set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1));
+ }
+
++static void l2c310_unlock(void __iomem *base, unsigned num_lock)
++{
++ if (readl_relaxed(base + L2X0_AUX_CTRL) & L310_AUX_CTRL_NS_LOCKDOWN)
++ l2c_unlock(base, num_lock);
++}
++
+ static const struct l2c_init_data l2c310_init_fns __initconst = {
+ .type = "L2C-310",
+ .way_size_0 = SZ_8K,
+@@ -763,6 +778,7 @@ static const struct l2c_init_data l2c310
+ .fixup = l2c310_fixup,
+ .save = l2c310_save,
+ .configure = l2c310_configure,
++ .unlock = l2c310_unlock,
+ .outer_cache = {
+ .inv_range = l2c210_inv_range,
+ .clean_range = l2c210_clean_range,
+@@ -1067,6 +1083,7 @@ static const struct l2c_init_data of_l2c
+ .enable = l2c_enable,
+ .save = l2c_save,
+ .configure = l2c_configure,
++ .unlock = l2c_unlock,
+ .outer_cache = {
+ .inv_range = l2c210_inv_range,
+ .clean_range = l2c210_clean_range,
+@@ -1086,6 +1103,7 @@ static const struct l2c_init_data of_l2c
+ .enable = l2c220_enable,
+ .save = l2c_save,
+ .configure = l2c_configure,
++ .unlock = l2c220_unlock,
+ .outer_cache = {
+ .inv_range = l2c220_inv_range,
+ .clean_range = l2c220_clean_range,
+@@ -1213,6 +1231,7 @@ static const struct l2c_init_data of_l2c
+ .fixup = l2c310_fixup,
+ .save = l2c310_save,
+ .configure = l2c310_configure,
++ .unlock = l2c310_unlock,
+ .outer_cache = {
+ .inv_range = l2c210_inv_range,
+ .clean_range = l2c210_clean_range,
+@@ -1242,6 +1261,7 @@ static const struct l2c_init_data of_l2c
+ .fixup = l2c310_fixup,
+ .save = l2c310_save,
+ .configure = l2c310_configure,
++ .unlock = l2c310_unlock,
+ .outer_cache = {
+ .inv_range = l2c210_inv_range,
+ .clean_range = l2c210_clean_range,
+@@ -1419,6 +1439,7 @@ static const struct l2c_init_data of_aur
+ .fixup = aurora_fixup,
+ .save = aurora_save,
+ .configure = l2c_configure,
++ .unlock = l2c_unlock,
+ .outer_cache = {
+ .inv_range = aurora_inv_range,
+ .clean_range = aurora_clean_range,
+@@ -1439,6 +1460,7 @@ static const struct l2c_init_data of_aur
+ .fixup = aurora_fixup,
+ .save = aurora_save,
+ .configure = l2c_configure,
++ .unlock = l2c_unlock,
+ .outer_cache = {
+ .resume = l2c_resume,
+ },
+@@ -1589,6 +1611,7 @@ static const struct l2c_init_data of_bcm
+ .enable = l2c310_enable,
+ .save = l2c310_save,
+ .configure = l2c310_configure,
++ .unlock = l2c310_unlock,
+ .outer_cache = {
+ .inv_range = bcm_inv_range,
+ .clean_range = bcm_clean_range,
+@@ -1626,6 +1649,7 @@ static const struct l2c_init_data of_tau
+ .enable = l2c_enable,
+ .save = tauros3_save,
+ .configure = tauros3_configure,
++ .unlock = l2c_unlock,
+ /* Tauros3 broadcasts L1 cache operations to L2 */
+ .outer_cache = {
+ .resume = l2c_resume,