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authorJonas Gorski <jonas.gorski@gmail.com>2012-07-24 16:33:12 +0200
committerRalf Baechle <ralf@linux-mips.org>2012-07-24 16:33:12 +0200
commit288752a8aa1be6cf89ee5066435a617efd97fb86 (patch)
tree233eca59b346fcf7febb039132ea0827a9192cfa /arch
parentaaf3fedb56c95b419eda4c5392e03ad9b82c4847 (diff)
downloadop-kernel-dev-288752a8aa1be6cf89ee5066435a617efd97fb86.zip
op-kernel-dev-288752a8aa1be6cf89ee5066435a617efd97fb86.tar.gz
MIPS: BCM63XX: Use the Chip ID register for identifying the SoC
Newer BCM63XX SoCs use virtually the same CPU ID, differing only in the revision bits. But since they all have the Chip ID register at the same location, we can use that to identify the SoC we are running on. Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com> Cc: linux-mips@linux-mips.org Cc: Maxime Bizon <mbizon@freebox.fr> Cc: Florian Fainelli <florian@openwrt.org> Cc: Kevin Cernekee <cernekee@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/3955/ Reviewed-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/bcm63xx/cpu.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/arch/mips/bcm63xx/cpu.c b/arch/mips/bcm63xx/cpu.c
index 8f0d6c7..e3c1da5 100644
--- a/arch/mips/bcm63xx/cpu.c
+++ b/arch/mips/bcm63xx/cpu.c
@@ -228,17 +228,21 @@ void __init bcm63xx_cpu_init(void)
bcm63xx_irqs = bcm6345_irqs;
break;
case CPU_BMIPS4350:
- switch (read_c0_prid() & 0xf0) {
- case 0x10:
+ if ((read_c0_prid() & 0xf0) == 0x10) {
expected_cpu_id = BCM6358_CPU_ID;
bcm63xx_regs_base = bcm6358_regs_base;
bcm63xx_irqs = bcm6358_irqs;
- break;
- case 0x30:
- expected_cpu_id = BCM6368_CPU_ID;
- bcm63xx_regs_base = bcm6368_regs_base;
- bcm63xx_irqs = bcm6368_irqs;
- break;
+ } else {
+ /* all newer chips have the same chip id location */
+ u16 chip_id = bcm_readw(BCM_6368_PERF_BASE);
+
+ switch (chip_id) {
+ case BCM6368_CPU_ID:
+ expected_cpu_id = BCM6368_CPU_ID;
+ bcm63xx_regs_base = bcm6368_regs_base;
+ bcm63xx_irqs = bcm6368_irqs;
+ break;
+ }
}
break;
}
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