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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
..
asm-arm Move definition of container_of() to common.h 2008-06-03 20:27:23 +02:00
asm-avr32 atmel_spi: Driver for the Atmel SPI controller 2008-06-03 20:30:05 +02:00
asm-blackfin Merge branch 'lwmon5' of /home/wd/git/u-boot/projects 2008-05-21 01:13:39 +02:00
asm-i386 Merge branch 'lwmon5' of /home/wd/git/u-boot/projects 2008-05-21 01:13:39 +02:00
asm-m68k Merge branch 'lwmon5' of /home/wd/git/u-boot/projects 2008-05-21 01:13:39 +02:00
asm-microblaze Merge branch 'lwmon5' of /home/wd/git/u-boot/projects 2008-05-21 01:13:39 +02:00
asm-mips mips: Add an 'include/asm/errno.h', like all other architectures 2008-05-30 00:53:38 +09:00
asm-nios Merge branch 'lwmon5' of /home/wd/git/u-boot/projects 2008-05-21 01:13:39 +02:00
asm-nios2 POST: replace the LOGBUFF_INITIALIZED flag in gd->post_log_word (1 << 31) with the GD_FLG_LOGINIT flag in gd->flags. 2008-05-20 23:24:38 +02:00
asm-ppc Fix warnings from gcc-4.3.0 build on a ppc host 2008-06-03 19:52:52 +02:00
asm-sh Merge branch 'lwmon5' of /home/wd/git/u-boot/projects 2008-05-21 01:13:39 +02:00
asm-sparc POST: replace the LOGBUFF_INITIALIZED flag in gd->post_log_word (1 << 31) with the GD_FLG_LOGINIT flag in gd->flags. 2008-05-20 23:24:38 +02:00
bedbug Big white-space cleanup. 2008-05-21 00:14:08 +02:00
configs [MIPS] lib_mips/time.c: Fix CP0 count register usage and timer routines 2008-06-05 22:29:00 +09:00
cramfs
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galileo Big white-space cleanup. 2008-05-21 00:14:08 +02:00
jffs2
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linux NAND: Provide a sane default for NAND_MAX_CHIPS. 2008-05-28 11:06:24 -05:00
pcmcia
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u-boot Add support for calculating hashes with watchdog triggering 2008-04-25 00:01:06 +02:00
.gitignore include/gitignore: update to all architectures 2008-05-09 20:59:21 +02:00
4xx_i2c.h
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74xx_7xx.h
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405_dimm.h
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405_mal.h
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ACEX1K.h Add size #defines for Altera Cyclone-II EP2C8 and EP2C20. 2008-06-03 21:40:09 +02:00
MCD_dma.h
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MCD_progCheck.h
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MCD_tasksInit.h
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SA-1100.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
_exports.h
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ahci.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
altera.h Altera Stratix II support 2008-04-13 14:52:48 -07:00
ambapp.h Coding Style cleanup; update CHANGELOG 2008-04-13 09:59:26 -07:00
api_public.h
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arm920t.h
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arm925t.h
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arm926ejs.h
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arm946es.h
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armcoremodule.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
at45.h
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at91rm9200_i2c.h
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at91rm9200_net.h
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ata.h
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atmel_lcdc.h Add ATMEL LCD driver 2008-05-10 11:44:55 +02:00
bcd.h
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bcm5221.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
bmp_layout.h
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bzlib.h
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circbuf.h
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clps7111.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
command.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
common.h Move definition of container_of() to common.h 2008-06-03 20:27:23 +02:00
commproc.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
config_cmd_all.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
config_cmd_default.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
console.h
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crc.h
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da9030.h
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dataflash.h Clean up dataflash partitioning 2008-04-18 00:24:05 -07:00
devices.h
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div64.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
dm9161.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
dp83848.h
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dtt.h
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e500.h
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elf.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
environment.h environment: fix bug introduced by commit a8409f4f1a 2008-05-14 23:36:10 +02:00
exports.h
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ext2fs.h
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fat.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
fdc.h
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fdt.h
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fdt_support.h
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fis.h
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flash.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
fpga.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ft_build.h
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hush.h
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i2c.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
i8042.h
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ide.h
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image.h Use watchdog-aware functions when calculating hashes of images - take two 2008-04-25 14:05:21 +02:00
ioports.h
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keyboard.h
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kgdb.h
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lcd.h Add ATMEL LCD driver 2008-05-10 11:44:55 +02:00
lcdvideo.h
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lh7a40x.h
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lh7a400.h
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lh7a404.h
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libata.h ata: update the libata.h from ata.h of linux kernel 2008-04-13 23:20:16 -07:00
libfdt.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
libfdt_env.h
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linux_logo.h
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lists.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
lmb.h
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logbuff.h Avoid initrd and logbuffer area overlaps 2008-06-03 19:34:19 +02:00
lpd7a400_cpld.h
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lxt971a.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
lynxkdi.h
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malloc.h
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mb862xx.h
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mii_phy.h
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miiphy.h
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mk48t59.h
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mmc.h
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mpc5xx.h
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mpc5xxx.h
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mpc8xx.h
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mpc8xx_irq.h
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mpc83xx.h mpc83xx: cleanup System Part and Revision ID Register (SPRIDR) code 2008-03-28 16:01:06 -05:00
mpc85xx.h
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mpc86xx.h
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mpc106.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
mpc512x.h
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mpc824x.h
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mpc8220.h
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mpc8260.h
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mpc8260_irq.h
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nand.h NAND: fix some strict-aliasing compiler warnings 2008-04-28 12:08:18 +02:00
net.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
nios-io.h
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nios.h
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nios2-epcs.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
nios2-io.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
nios2.h
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ns7520_eth.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ns9750_bbus.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ns9750_eth.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ns9750_mem.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ns9750_ser.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ns9750_sys.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ns16550.h
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ns87308.h
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onenand_uboot.h Make onenand_uboot.h self-sufficient. 2008-05-28 11:06:28 -05:00
part.h
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pc_keyb.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
pci.h Update pci code to use phys_addr_t 2008-05-10 00:59:57 +02:00
pci_ids.h Additional PCI IDs for IDE and network controllers 2008-04-17 13:37:57 -07:00
pcmcia.h
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post.h POST: add POST_STOP flag 2008-05-20 23:24:37 +02:00
ppc4xx.h
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ppc4xx_enet.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ppc405.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ppc440.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
ppc_asm.tmpl
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ppc_defs.h
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ps2mult.h
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radeon.h
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reiserfs.h
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rtc.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
s3c24x0.h
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s3c2400.h
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s3c2410.h
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s_record.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
sa1100.h
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sata.h drivers: code clean up 2008-04-13 14:57:46 -07:00
scsi.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
sed156x.h
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sed13806.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
serial.h
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sha1.h Add support for calculating hashes with watchdog triggering 2008-04-25 00:01:06 +02:00
sm501.h
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smiLynxEM.h
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spartan2.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
spartan3.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
spd.h
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spd_sdram.h
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spi.h SPI API improvements 2008-06-03 20:28:50 +02:00
spi_flash.h SPI Flash subsystem 2008-06-03 20:31:34 +02:00
status_led.h
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stratixII.h Altera Stratix II support 2008-04-13 14:52:48 -07:00
sym53c8xx.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
systemace.h
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tsi108.h
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universe.h
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usb.h
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usb_cdc_acm.h
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usb_defs.h
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usbdcore.h
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usbdcore_ep0.h
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usbdcore_mpc8xx.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
usbdcore_omap1510.h
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usbdescriptors.h
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version.h Makefile: fix "error: version_autogenerated.h: No such file or directory" 2008-05-13 23:15:52 +02:00
vfd_logo.h
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video.h
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video_ad7176.h
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video_ad7177.h
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video_ad7179.h
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video_easylogo.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
video_fb.h
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video_font.h
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video_logo.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
virtex2.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
vsc7385.h
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w83c553f.h
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watchdog.h
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xilinx.h Big white-space cleanup. 2008-05-21 00:14:08 +02:00
xyzModem.h
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zlib.h
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