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| author | Stephen Warren <swarren@nvidia.com> | 2014-02-18 16:51:58 -0700 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2014-02-18 20:30:59 -0800 |
| commit | 8859685785bfafadf9bc922dd3a2278e59886947 (patch) | |
| tree | cf73871e0e0ccb40547685edf64d0e7a43c81274 | |
| parent | 688b56b485578465f6619b9529d08c2b95641915 (diff) | |
| download | lwn-8859685785bfafadf9bc922dd3a2278e59886947.tar.gz lwn-8859685785bfafadf9bc922dd3a2278e59886947.zip | |
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>
| -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] = { 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; |