[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>
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