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authorShinya Kuribayashi <skuribay@ruby.dti.ne.jp>2008-06-05 22:29:00 +0900
committerShinya Kuribayashi <skuribay@ruby.dti.ne.jp>2008-06-05 22:29:00 +0900
commita55d48174cfd1a5bc184159513f48dcbbe409c83 (patch)
tree9d55affb405aea800e9f2a5c423805cf2370c824 /include/configs/qemu-mips.h
parent199e4f657c8af42efe3fb3ba1d1104eb6bb28c25 (diff)
[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/qemu-mips.h')
-rw-r--r--include/configs/qemu-mips.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/configs/qemu-mips.h b/include/configs/qemu-mips.h
index d6bcc8e3b16..3dfd2181f48 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 */