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| author | Lennert Buytenhek <buytenh@org.rmk.(none)> | 2005-06-20 18:51:07 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-06-20 18:51:07 +0100 |
| commit | e4fe19819ef32950541503042f32e71b67edffc7 (patch) | |
| tree | 57c68008ba8c3b3a9f6ab8950c620175e9405569 /include | |
| parent | c0da085ad2e6b1419b8a7439538f7f15eb5c4777 (diff) | |
| download | linux-e4fe19819ef32950541503042f32e71b67edffc7.tar.gz linux-e4fe19819ef32950541503042f32e71b67edffc7.tar.bz2 linux-e4fe19819ef32950541503042f32e71b67edffc7.zip | |
[PATCH] ARM: 2701/1: free up ixp2000 timer 4 for the watchdog
Patch from Lennert Buytenhek
The IXP2000 has four timers, but if we're on an A-step IXP2800, timer
2 and 3 don't work. We need two timers for timekeeping (one for the
timer interrupt and one for tracking missed jiffies), so on early
IXP2800s we have no other choice but to use timer 1 and 4 for that,
but on all other IXP2000s we'd rather leave timer 4 free since that's
the only timer we can use for the watchdog.
So, on buggy IXP2000s (i.e. the A-step IXP2800) we use timer 4 for
tracking missed jiffies, and on all all non-buggy IXP2000s (i.e.
everything but the A-step IXP2800) we use timer 2.
On a pre-production IXP2800, this patch should print these messages
on boot:
Enabling IXP2800 erratum #25 workaround
Unable to use IXP2000 watchdog due to IXP2800 erratum #25
On any non-buggy IXP2800 (as well as on IXP2400s) you shouldn't see
anything at all, and the watchdog should be usable again.
Signed-off-by: Lennert Buytenhek
Signed-off-by: Deepak Saxena
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-arm/arch-ixp2000/ixp2000-regs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-arm/arch-ixp2000/ixp2000-regs.h b/include/asm-arm/arch-ixp2000/ixp2000-regs.h index 6c56708d0ff0..a1d9e181b10f 100644 --- a/include/asm-arm/arch-ixp2000/ixp2000-regs.h +++ b/include/asm-arm/arch-ixp2000/ixp2000-regs.h @@ -363,6 +363,7 @@ #define IXP2000_MIN_REV_MASK 0x0000000F #define IXP2000_PROD_ID_MASK 0xFFFFFFFF +#define IXP2000_PRODUCT_ID GLOBAL_REG(0x00) #define IXP2000_MISC_CONTROL GLOBAL_REG(0x04) #define IXP2000_MSF_CLK_CNTRL GLOBAL_REG(0x08) #define IXP2000_RESET0 GLOBAL_REG(0x0c) |