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6 commits

Author SHA1 Message Date
Shinya Kuribayashi
a55d48174c [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>
2008-06-05 22:29:00 +09:00
Shinya Kuribayashi
199e4f657c [MIPS] lib_mips/time.c: Fix udelay
What we have to do is just to wait for given micro-seconds. No need to
take into account current time, get_timer and CFG_HZ.

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
2008-06-05 22:29:00 +09:00
Shinya Kuribayashi
c7e38e413a [MIPS] lib_mips/time.c: Replace CP0 access functions with existing macros
We already have many pre-defined CP0 access macros in <asm/mipsregs.h>.
This patch replaces mips_{compare,count}_set and mips_count_get with
existing macros.

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
2008-06-05 22:28:59 +09:00
wdenk
e0ac62d798 * Make Ethernet autonegotiation on INCA-IP work for all clock rates;
allow selection of clock frequency as "make" target

* Implement memory autosizing code for IceCube boards

* Configure network port on INCA-IP for autonegotiation

* Fix overflow problem in network timeout code

* Patch by Richard Woodruff, 8 Aug 2003:
  Allow crc32 to be used at address 0x000 (crc32_no_comp, too).
2003-08-17 18:55:18 +00:00
wdenk
8bde7f776c * Code cleanup:
- remove trailing white space, trailing empty lines, C++ comments, etc.
  - split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c)

* Patches by Kenneth Johansson, 25 Jun 2003:
  - major rework of command structure
    (work done mostly by Michal Cendrowski and Joakim Kristiansen)
2003-06-27 21:31:46 +00:00
wdenk
c021880ac5 * Add support for MIPS32 4Kc CPUs
* Add support for INCA-IP Board
2003-03-27 12:09:35 +00:00