diff options
author | Stephen Warren <swarren@nvidia.com> | 2014-02-18 18:51:58 -0500 |
---|---|---|
committer | Olof Johansson <olof@lixom.net> | 2014-02-18 23:30:59 -0500 |
commit | 8859685785bfafadf9bc922dd3a2278e59886947 (patch) | |
tree | cf73871e0e0ccb40547685edf64d0e7a43c81274 /arch/arm/mach-tegra | |
parent | 688b56b485578465f6619b9529d08c2b95641915 (diff) |
ARM: tegra: only run PL310 init on systems with one
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.
Cc: <stable@vger.kernel.org> # v3.9+
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-tegra')
-rw-r--r-- | arch/arm/mach-tegra/tegra.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/tegra.c b/arch/arm/mach-tegra/tegra.c index 303a285d80fd..6191603379e1 100644 --- a/arch/arm/mach-tegra/tegra.c +++ b/arch/arm/mach-tegra/tegra.c | |||
@@ -73,10 +73,20 @@ u32 tegra_uart_config[3] = { | |||
73 | static void __init tegra_init_cache(void) | 73 | static void __init tegra_init_cache(void) |
74 | { | 74 | { |
75 | #ifdef CONFIG_CACHE_L2X0 | 75 | #ifdef CONFIG_CACHE_L2X0 |
76 | static const struct of_device_id pl310_ids[] __initconst = { | ||
77 | { .compatible = "arm,pl310-cache", }, | ||
78 | {} | ||
79 | }; | ||
80 | |||
81 | struct device_node *np; | ||
76 | int ret; | 82 | int ret; |
77 | void __iomem *p = IO_ADDRESS(TEGRA_ARM_PERIF_BASE) + 0x3000; | 83 | void __iomem *p = IO_ADDRESS(TEGRA_ARM_PERIF_BASE) + 0x3000; |
78 | u32 aux_ctrl, cache_type; | 84 | u32 aux_ctrl, cache_type; |
79 | 85 | ||
86 | np = of_find_matching_node(NULL, pl310_ids); | ||
87 | if (!np) | ||
88 | return; | ||
89 | |||
80 | cache_type = readl(p + L2X0_CACHE_TYPE); | 90 | cache_type = readl(p + L2X0_CACHE_TYPE); |
81 | aux_ctrl = (cache_type & 0x700) << (17-8); | 91 | aux_ctrl = (cache_type & 0x700) << (17-8); |
82 | aux_ctrl |= 0x7C400001; | 92 | aux_ctrl |= 0x7C400001; |