[U-Boot-Users] [PATCH] [resend] mips: Support to set CFG_HZ to 1000, consistent with other architectures
Jason McMullan
mcmullan at netapp.com
Tue May 20 18:24:54 CEST 2008
All existing MIPS boards define CFG_HZ to be the number of ticks per second
for the timebase. However, CFG_HZ should be a constant 1000 for all boards.
This patch set CFG_HZ to be defined as 1000 for all MIPS boards, and uses
the new configuration value CFG_MIPS_CLOCK to calculate the timebase.
The MIPS time code now has a software maintained 64-bit counter, however
get_timer() must be called every few seconds for this counter to be fully
reliable.
Per-board patches to board config files are included.
Signed-off-by: Jason McMullan <mcmullan at netapp.com>
---
include/configs/dbau1x00.h | 3 ++-
include/configs/gth2.h | 3 ++-
include/configs/incaip.h | 3 ++-
include/configs/pb1x00.h | 3 ++-
include/configs/purple.h | 3 ++-
include/configs/qemu-mips.h | 3 ++-
include/configs/tb0229.h | 3 ++-
lib_mips/time.c | 36 +++++++++++++++++++++++++++++++++++-
8 files changed, 49 insertions(+), 8 deletions(-)
diff --git a/include/configs/dbau1x00.h b/include/configs/dbau1x00.h
index b2f606f..b4cc0c2 100644
--- a/include/configs/dbau1x00.h
+++ b/include/configs/dbau1x00.h
@@ -148,7 +148,8 @@
#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_CLOCK (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..656eccb 100644
--- a/include/configs/gth2.h
+++ b/include/configs/gth2.h
@@ -117,8 +117,9 @@
#define CFG_BOOTPARAMS_LEN 128*1024
#define CFG_MHZ 500
+#define CFG_MIPS_CLOCK (CFG_MHZ * 1000000)
-#define CFG_HZ (CFG_MHZ * 1000000) /* FIXME causes overflow in net.c */
+#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..c0e26f2 100644
--- a/include/configs/incaip.h
+++ b/include/configs/incaip.h
@@ -118,7 +118,8 @@
#define CFG_BOOTPARAMS_LEN 128*1024
-#define CFG_HZ (incaip_get_cpuclk() / 2)
+#define CFG_MIPS_CLOCK (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..5cb5069 100644
--- a/include/configs/pb1x00.h
+++ b/include/configs/pb1x00.h
@@ -81,7 +81,8 @@
#define CFG_BOOTPARAMS_LEN 128*1024
-#define CFG_HZ 396000000 /* FIXME causes overflow in net.c */
+#define CFG_MIPS_CLOCK 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..9fe98f2 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_CLOCK (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..6889d7f 100644
--- a/include/configs/qemu-mips.h
+++ b/include/configs/qemu-mips.h
@@ -119,8 +119,9 @@
#define CFG_BOOTPARAMS_LEN 128*1024
#define CFG_MHZ 132
+#define CFG_MIPS_CLOCK (132 * 1000000)
-#define CFG_HZ (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..82206d5 100644
--- a/include/configs/tb0229.h
+++ b/include/configs/tb0229.h
@@ -122,7 +122,8 @@
#define CFG_BOOTPARAMS_LEN 128*1024
-#define CFG_HZ (CPU_TCLOCK_RATE/4)
+#define CFG_MIPS_CLOCK (CPU_TCLOCK_RATE/4)
+#define CFG_HZ 1000
#define CFG_SDRAM_BASE 0x80000000
diff --git a/lib_mips/time.c b/lib_mips/time.c
index cd8dc72..4807f1a 100644
--- a/lib_mips/time.c
+++ b/lib_mips/time.c
@@ -23,23 +23,57 @@
#include <common.h>
+/* CFG_MIPS_CLOCK is the number of ticks per second of the MIPS C0 Clock timer.
+ *
+ * For most implementations, this is the same as the CPU speed in HZ
+ * divided by 2. Some embedded MIPS implementations may use a /4
+ * or /1 divider, so see your CPU reference manual for specific details.
+ */
+#ifndef CFG_MIPS_CLOCK
+#error CFG_MIPS_CLOCK must be set in the board configuration file
+#endif
+static struct {
+ uint32_t lo;
+ uint32_t hi;
+} mips_ticks; /* Last number of ticks seen */
+
+/* Input is in CFG_HZ ticks */
static inline void mips_compare_set(u32 v)
{
+ v *= (CFG_MIPS_CLOCK / CFG_HZ);
asm volatile ("mtc0 %0, $11" : : "r" (v));
}
+/* Input is in CFG_HZ ticks */
static inline void mips_count_set(u32 v)
{
+ v *= (CFG_MIPS_CLOCK / CFG_HZ);
+ mips_ticks.lo = v;
+ mips_ticks.hi = 0;
asm volatile ("mtc0 %0, $9" : : "r" (v));
}
+/* Returns CFG_HZ ticks
+ *
+ * NOTE: This must be called at least once every
+ * few seconds to be reliable.
+ */
static inline u32 mips_count_get(void)
{
u32 count;
asm volatile ("mfc0 %0, $9" : "=r" (count) :);
+
+ /* Handle 32-bit timer overflow */
+ if (count < mips_ticks.lo) {
+ mips_ticks.hi++;
+ }
+ mips_ticks.lo = count;
+ count =(mips_ticks.lo / (CFG_MIPS_CLOCK / CFG_HZ)) +
+ (mips_ticks.hi * (0x100000000ULL / (CFG_MIPS_CLOCK / CFG_HZ)));
+
return count;
}
@@ -75,7 +109,7 @@ void udelay (unsigned long usec)
ulong tmo;
ulong start = get_timer(0);
- tmo = usec * (CFG_HZ / 1000000);
+ tmo = usec * CFG_HZ / 1000;
while ((ulong)((mips_count_get() - start)) < tmo)
/*NOP*/;
}
--
1.5.4.3
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