aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorStephen Warren <swarren@nvidia.com>2014-02-18 16:51:58 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-03-06 21:30:12 -0800
commit79e43826099dad17a9ff6014b508f2de950099f6 (patch)
treeda95fbbd4062f90177299b146d1bbae39e2037fc
parentc56e0dc1b70f1537659acffc6ac8d8d615be2dae (diff)
downloadlinux-linaro-stable-79e43826099dad17a9ff6014b508f2de950099f6.tar.gz
ARM: tegra: only run PL310 init on systems with one
commit 8859685785bfafadf9bc922dd3a2278e59886947 upstream. Fix tegra_init_cache() to check whether the system has a PL310 cache before touching the PL310 registers. This prevents access to non-existent registers on Tegra114 and later. Note for stable kernels: In <= v3.12, the file to patch is arch/arm/mach-tegra/common.c. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/arm/mach-tegra/common.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 9f852c6fe5b9..d5ebcd0bb622 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -22,6 +22,7 @@
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/delay.h>
+#include <linux/of.h>
#include <linux/irqchip.h>
#include <linux/clk/tegra.h>
@@ -80,10 +81,20 @@ void tegra_assert_system_reset(char mode, const char *cmd)
static void __init tegra_init_cache(void)
{
#ifdef CONFIG_CACHE_L2X0
+ static const struct of_device_id pl310_ids[] __initconst = {
+ { .compatible = "arm,pl310-cache", },
+ {}
+ };
+
+ struct device_node *np;
int ret;
void __iomem *p = IO_ADDRESS(TEGRA_ARM_PERIF_BASE) + 0x3000;
u32 aux_ctrl, cache_type;
+ np = of_find_matching_node(NULL, pl310_ids);
+ if (!np)
+ return;
+
cache_type = readl(p + L2X0_CACHE_TYPE);
aux_ctrl = (cache_type & 0x700) << (17-8);
aux_ctrl |= 0x7C400001;