u-boot/include/configs/qemu-mips.h
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

173 lines
4.5 KiB
C

/*
* (C) Copyright 2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* This file contains the configuration parameters for qemu-mips target.
*/
#ifndef __CONFIG_H
#define __CONFIG_H
#define CONFIG_MIPS32 1 /* MIPS32 CPU core */
#define CONFIG_QEMU_MIPS 1
#define CONFIG_MISC_INIT_R
/*IP address is default used by Qemu*/
#define CONFIG_IPADDR 10.0.2.15 /* Our IP address */
#define CONFIG_SERVERIP 10.0.2.2 /* Server IP address */
#define CONFIG_BOOTDELAY 10 /* autoboot after 10 seconds */
#define CONFIG_BAUDRATE 115200
/* valid baudrates */
#define CFG_BAUDRATE_TABLE { 9600, 19200, 38400, 57600, 115200 }
#define CONFIG_TIMESTAMP /* Print image info with timestamp */
#undef CONFIG_BOOTARGS
#define CONFIG_EXTRA_ENV_SETTINGS \
"addmisc=setenv bootargs ${bootargs} " \
"console=ttyS0,${baudrate} " \
"panic=1\0" \
"bootfile=/tftpboot/vmlinux\0" \
"load=tftp 80500000 ${u-boot}\0" \
""
#define CONFIG_BOOTCOMMAND "bootp;bootelf"
/*
* BOOTP options
*/
#define CONFIG_BOOTP_BOOTFILESIZE
#define CONFIG_BOOTP_BOOTPATH
#define CONFIG_BOOTP_GATEWAY
#define CONFIG_BOOTP_HOSTNAME
/*
* Command line configuration.
*/
#include <config_cmd_default.h>
#define CONFIG_CMD_ELF
#define CONFIG_CMD_FAT
#define CONFIG_CMD_EXT2
#undef CONFIG_CMD_LOADB
#undef CONFIG_CMD_LOADS
#define CONFIG_CMD_DHCP
#define CONFIG_DRIVER_NE2000
#define CONFIG_DRIVER_NE2000_BASE (0xb4000300)
#define CFG_NS16550
#define CFG_NS16550_SERIAL
#define CFG_NS16550_REG_SIZE 1
#define CFG_NS16550_CLK 115200
#define CFG_NS16550_COM1 (0xb40003f8)
#define CONFIG_CONS_INDEX 1
#define CONFIG_CMD_IDE
#define CONFIG_DOS_PARTITION
#define CFG_IDE_MAXBUS 2
#define CFG_ATA_IDE0_OFFSET (0x1f0)
#define CFG_ATA_IDE1_OFFSET (0x170)
#define CFG_ATA_DATA_OFFSET (0)
#define CFG_ATA_REG_OFFSET (0)
#define CFG_ATA_BASE_ADDR (0xb4000000)
#define CFG_IDE_MAXDEVICE (4)
/*
* Miscellaneous configurable options
*/
#define CFG_LONGHELP /* undef to save memory */
#define CFG_PROMPT "qemu-mips # " /* Monitor Command Prompt */
#define CONFIG_AUTO_COMPLETE
#define CONFIG_CMDLINE_EDITING
#define CFG_HUSH_PARSER
#define CFG_PROMPT_HUSH_PS2 "> "
#define CFG_CBSIZE 256 /* Console I/O Buffer Size */
#define CFG_PBSIZE (CFG_CBSIZE+sizeof(CFG_PROMPT)+16) /* Print Buffer Size */
#define CFG_MAXARGS 16 /* max number of command args */
#define CFG_MALLOC_LEN 128*1024
#define CFG_BOOTPARAMS_LEN 128*1024
#define CFG_MHZ 132
#define CFG_MIPS_TIMER_FREQ (CFG_MHZ * 1000000)
#define CFG_HZ 1000
#define CFG_SDRAM_BASE 0x80000000 /* Cached addr */
#define CFG_LOAD_ADDR 0x81000000 /* default load address */
#define CFG_MEMTEST_START 0x80100000
#define CFG_MEMTEST_END 0x80800000
/*-----------------------------------------------------------------------
* FLASH and environment organization
*/
/* The following #defines are needed to get flash environment right */
#define CFG_MONITOR_BASE TEXT_BASE
#define CFG_MONITOR_LEN (192 << 10)
#define CFG_INIT_SP_OFFSET 0x400000
/* We boot from this flash, selected with dip switch */
#define CFG_FLASH_BASE 0xbfc00000
#define CFG_MAX_FLASH_BANKS 1
#define CFG_MAX_FLASH_SECT 128
#define CFG_FLASH_CFI 1 /* Flash memory is CFI compliant */
#define CFG_FLASH_CFI_DRIVER 1
#define CFG_FLASH_USE_BUFFER_WRITE 1
#define CFG_ENV_IS_IN_FLASH 1
#define CFG_ENV_ADDR (CFG_FLASH_BASE + 0x40000)
/* Address and size of Primary Environment Sector */
#define CFG_ENV_SIZE 0x8000
#define CONFIG_ENV_OVERWRITE 1
#undef CONFIG_NET_MULTI
#define MEM_SIZE 128
#undef CONFIG_MEMSIZE_IN_BYTES
/*-----------------------------------------------------------------------
* Cache Configuration
*/
#define CFG_DCACHE_SIZE 16384
#define CFG_ICACHE_SIZE 16384
#define CFG_CACHELINE_SIZE 32
#endif /* __CONFIG_H */