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author | Shinya Kuribayashi <skuribay@ruby.dti.ne.jp> | 2008-06-05 13:29:00 (GMT) |
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committer | Shinya Kuribayashi <skuribay@ruby.dti.ne.jp> | 2008-06-05 13:29:00 (GMT) |
commit | a55d48174cfd1a5bc184159513f48dcbbe409c83 (patch) | |
tree | 9d55affb405aea800e9f2a5c423805cf2370c824 /include/configs | |
parent | 199e4f657c8af42efe3fb3ba1d1104eb6bb28c25 (diff) | |
download | u-boot-a55d48174cfd1a5bc184159513f48dcbbe409c83.tar.xz |
[MIPS] lib_mips/time.c: Fix CP0 count register usage and timer routines
MIPS port has two problems in timer routines. One is now we assume CFG_HZ
equals to CP0 counter frequency, but this is wrong. CFG_HZ has to be 1000
in the U-Boot system.
The other is we don't have a proper time management counter like timestamp
other ARCHs have. We need the 32-bit millisecond clock counter.
This patch introduces timestamp and CYCLES_PER_JIFFY. timestamp is a
32-bit non-overflowing CFG_HZ counter, and CYCLES_PER_JIFFY is the number
of calculated CP0 counter cycles in a CFG_HZ.
STRATEGY:
* Fix improper CFG_HZ value to have 1000
* Use CFG_MIPS_TIMER_FREQ for timer counter frequency, instead.
* timer_init: initialize timestamp and set up the first timer expiration.
Note that we don't need to initialize CP0 count/compare registers here
as they have been already zeroed out on the system reset. Leave them as
they are.
* get_timer: calculate how many timestamps have been passed, then return
base-relative timestamp. Make sure we can easily count missed timestamps
regardless of CP0 count/compare value.
* get_ticks: return the current timestamp, that is get_timer(0).
Most parts are from good old Linux v2.6.16 kernel.
v2:
- Remove FIXME comments as they turned out to be trivial.
- Use CP0 compare register as a global variable for expirelo.
- Kill a global variable 'cycles_per_jiffy'. Use #define CYCLES_PER_JIFFY
instead.
Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
Diffstat (limited to 'include/configs')
-rw-r--r-- | include/configs/dbau1x00.h | 4 | ||||
-rw-r--r-- | include/configs/gth2.h | 4 | ||||
-rw-r--r-- | include/configs/incaip.h | 4 | ||||
-rw-r--r-- | include/configs/pb1x00.h | 4 | ||||
-rw-r--r-- | include/configs/purple.h | 3 | ||||
-rw-r--r-- | include/configs/qemu-mips.h | 4 | ||||
-rw-r--r-- | include/configs/tb0229.h | 4 |
7 files changed, 20 insertions, 7 deletions
diff --git a/include/configs/dbau1x00.h b/include/configs/dbau1x00.h index b2f606f..45ff1e7 100644 --- a/include/configs/dbau1x00.h +++ b/include/configs/dbau1x00.h @@ -148,7 +148,9 @@ #error "Invalid CPU frequency - must be multiple of 12!" #endif -#define CFG_HZ (CFG_MHZ * 1000000) /* FIXME causes overflow in net.c */ +#define CFG_MIPS_TIMER_FREQ (CFG_MHZ * 1000000) + +#define CFG_HZ 1000 #define CFG_SDRAM_BASE 0x80000000 /* Cached addr */ diff --git a/include/configs/gth2.h b/include/configs/gth2.h index c2a50c1..23618db 100644 --- a/include/configs/gth2.h +++ b/include/configs/gth2.h @@ -118,7 +118,9 @@ #define CFG_MHZ 500 -#define CFG_HZ (CFG_MHZ * 1000000) /* FIXME causes overflow in net.c */ +#define CFG_MIPS_TIMER_FREQ (CFG_MHZ * 1000000) + +#define CFG_HZ 1000 #define CFG_SDRAM_BASE 0x80000000 /* Cached addr */ diff --git a/include/configs/incaip.h b/include/configs/incaip.h index 5ca00b3..2e4ee66 100644 --- a/include/configs/incaip.h +++ b/include/configs/incaip.h @@ -118,7 +118,9 @@ #define CFG_BOOTPARAMS_LEN 128*1024 -#define CFG_HZ (incaip_get_cpuclk() / 2) +#define CFG_MIPS_TIMER_FREQ (incaip_get_cpuclk() / 2) + +#define CFG_HZ 1000 #define CFG_SDRAM_BASE 0x80000000 diff --git a/include/configs/pb1x00.h b/include/configs/pb1x00.h index 810e0f0..181cd11 100644 --- a/include/configs/pb1x00.h +++ b/include/configs/pb1x00.h @@ -81,7 +81,9 @@ #define CFG_BOOTPARAMS_LEN 128*1024 -#define CFG_HZ 396000000 /* FIXME causes overflow in net.c */ +#define CFG_MIPS_TIMER_FREQ 396000000 + +#define CFG_HZ 1000 #define CFG_SDRAM_BASE 0x80000000 /* Cached addr */ diff --git a/include/configs/purple.h b/include/configs/purple.h index 1be4e05..ef92637 100644 --- a/include/configs/purple.h +++ b/include/configs/purple.h @@ -114,7 +114,8 @@ #define CFG_PROMPT "PURPLE # " /* Monitor Command Prompt */ #define CFG_CBSIZE 256 /* Console I/O Buffer Size */ #define CFG_PBSIZE (CFG_CBSIZE+sizeof(CFG_PROMPT)+16) /* Print Buffer Size */ -#define CFG_HZ (CPU_CLOCK_RATE/2) +#define CFG_MIPS_TIMER_FREQ (CPU_CLOCK_RATE/2) +#define CFG_HZ 1000 #define CFG_MAXARGS 16 /* max number of command args*/ #define CFG_LOAD_ADDR 0x80500000 /* default load address */ diff --git a/include/configs/qemu-mips.h b/include/configs/qemu-mips.h index d6bcc8e..3dfd218 100644 --- a/include/configs/qemu-mips.h +++ b/include/configs/qemu-mips.h @@ -120,7 +120,9 @@ #define CFG_MHZ 132 -#define CFG_HZ (CFG_MHZ * 1000000) +#define CFG_MIPS_TIMER_FREQ (CFG_MHZ * 1000000) + +#define CFG_HZ 1000 #define CFG_SDRAM_BASE 0x80000000 /* Cached addr */ diff --git a/include/configs/tb0229.h b/include/configs/tb0229.h index dadf5d3..fc2357d 100644 --- a/include/configs/tb0229.h +++ b/include/configs/tb0229.h @@ -122,7 +122,9 @@ #define CFG_BOOTPARAMS_LEN 128*1024 -#define CFG_HZ (CPU_TCLOCK_RATE/4) +#define CFG_MIPS_TIMER_FREQ (CPU_TCLOCK_RATE/4) + +#define CFG_HZ 1000 #define CFG_SDRAM_BASE 0x80000000 |