| /* |
| * time.c: MIPS CPU Count/Compare timer hookup |
| * |
| * Author: Mark.Zhan, <rongkai.zhan@windriver.com> |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1996, 1997, 2004 by Ralf Baechle (ralf@linux-mips.org) |
| * Copyright (C) 2006, Wind River System Inc. |
| */ |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| |
| #include <asm/gt64120.h> |
| #include <asm/time.h> |
| |
| #define WRPPMC_CPU_CLK_FREQ 40000000 /* 40MHZ */ |
| |
| /* |
| * Estimate CPU frequency. Sets mips_hpt_frequency as a side-effect |
| * |
| * NOTE: We disable all GT64120 timers, and use MIPS processor internal |
| * timer as the source of kernel clock tick. |
| */ |
| void __init plat_time_init(void) |
| { |
| /* Disable GT64120 timers */ |
| GT_WRITE(GT_TC_CONTROL_OFS, 0x00); |
| GT_WRITE(GT_TC0_OFS, 0x00); |
| GT_WRITE(GT_TC1_OFS, 0x00); |
| GT_WRITE(GT_TC2_OFS, 0x00); |
| GT_WRITE(GT_TC3_OFS, 0x00); |
| |
| /* Use MIPS compare/count internal timer */ |
| mips_hpt_frequency = WRPPMC_CPU_CLK_FREQ; |
| } |
