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ARM: SAMSUNG: Fixup endian issues in CPU detection 

If the system is built for big endian, then the CPU identificaiton register
will be read in the wrong order. Fix this by using readl_relaxed() on the
register.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This commit is contained in:
Ben Dooks 2016-06-21 11:20:23 +01:00 committed by Krzysztof Kozlowski
parent 4fdfa8623d
commit f4c24f36c3
1 changed files with 4 additions and 4 deletions
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8
arch/arm/plat-samsung/cpu.c
View File

@ -29,14 +29,14 @@ EXPORT_SYMBOL(samsung_rev);
void __init s3c64xx_init_cpu(void)
{
samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118);
samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0x118);
if (!samsung_cpu_id) {
/*
* S3C6400 has the ID register in a different place,
* and needs a write before it can be read.
*/
__raw_writel(0x0, S3C_VA_SYS + 0xA1C);
samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C);
writel_relaxed(0x0, S3C_VA_SYS + 0xA1C);
samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0xA1C);
}
samsung_cpu_rev = 0;
@ -46,7 +46,7 @@ void __init s3c64xx_init_cpu(void)
void __init s5p_init_cpu(void __iomem *cpuid_addr)
{
samsung_cpu_id = __raw_readl(cpuid_addr);
samsung_cpu_id = readl_relaxed(cpuid_addr);
samsung_cpu_rev = samsung_cpu_id & 0xFF;
pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);