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authorHauke Mehrtens <hauke@hauke-m.de>2013-09-18 15:32:59 +0400
committerRalf Baechle <ralf@linux-mips.org>2013-10-30 00:24:07 +0400
commit2224de9d152b6fd9faa0df49cf55ca97eab772fa (patch)
tree80503a335a8b04d2a5d5cb71ea940af8a6de1df6 /arch/mips/bcm47xx/time.c
parent62cf3bc0b59cfb70a021784af914c6ea464d3af7 (diff)
downloadlinux-2224de9d152b6fd9faa0df49cf55ca97eab772fa.tar.xz
MIPS: BCM47XX: Fix clock detection for BCM5354 with 200MHz clock
Some BCM5354 SoCs are running at 200MHz, but it is not possible to read the clock from a register like it is done on some other SoC in ssb and bcma. These devices should have a clkfreq nvram configuration value set to 200, read it and set the clock to the correct value. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5842/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/bcm47xx/time.c')
-rw-r--r--arch/mips/bcm47xx/time.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/mips/bcm47xx/time.c b/arch/mips/bcm47xx/time.c
index 536374dcba78..5e5d797fa90a 100644
--- a/arch/mips/bcm47xx/time.c
+++ b/arch/mips/bcm47xx/time.c
@@ -27,10 +27,14 @@
#include <linux/ssb/ssb.h>
#include <asm/time.h>
#include <bcm47xx.h>
+#include <bcm47xx_nvram.h>
void __init plat_time_init(void)
{
unsigned long hz = 0;
+ u16 chip_id = 0;
+ char buf[10];
+ int len;
/*
* Use deterministic values for initial counter interrupt
@@ -43,15 +47,23 @@ void __init plat_time_init(void)
#ifdef CONFIG_BCM47XX_SSB
case BCM47XX_BUS_TYPE_SSB:
hz = ssb_cpu_clock(&bcm47xx_bus.ssb.mipscore) / 2;
+ chip_id = bcm47xx_bus.ssb.chip_id;
break;
#endif
#ifdef CONFIG_BCM47XX_BCMA
case BCM47XX_BUS_TYPE_BCMA:
hz = bcma_cpu_clock(&bcm47xx_bus.bcma.bus.drv_mips) / 2;
+ chip_id = bcm47xx_bus.bcma.bus.chipinfo.id;
break;
#endif
}
+ if (chip_id == 0x5354) {
+ len = bcm47xx_nvram_getenv("clkfreq", buf, sizeof(buf));
+ if (len >= 0 && !strncmp(buf, "200", 4))
+ hz = 100000000;
+ }
+
if (!hz)
hz = 100000000;