projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a240a469 MZ |
1 | /* |
| 2 | * time.c: MIPS CPU Count/Compare timer hookup | |
| 3 | * | |
| 4 | * Author: Mark.Zhan, <rongkai.zhan@windriver.com> | |
| 5 | * | |
| 6 | * This file is subject to the terms and conditions of the GNU General Public | |
| 7 | * License. See the file "COPYING" in the main directory of this archive | |
| 8 | * for more details. | |
| 9 | * | |
| 10 | * Copyright (C) 1996, 1997, 2004 by Ralf Baechle (ralf@linux-mips.org) | |
| 11 | * Copyright (C) 2006, Wind River System Inc. | |
| 12 | */ | |
| a240a469 | 13 | #include <linux/init.h> |
| a240a469 | 14 | #include <linux/interrupt.h> |
| 4b92fe23 | 15 | #include <linux/irq.h> |
| a240a469 | 16 | |
| a240a469 | 17 | #include <asm/gt64120.h> |
| 4b92fe23 | 18 | #include <asm/time.h> |
| a240a469 MZ |
19 | |
| 20 | #define WRPPMC_CPU_CLK_FREQ 40000000 /* 40MHZ */ | |
| 21 | ||
| a240a469 MZ |
22 | /* |
| 23 | * Estimate CPU frequency. Sets mips_hpt_frequency as a side-effect | |
| 24 | * | |
| 25 | * NOTE: We disable all GT64120 timers, and use MIPS processor internal | |
| 26 | * timer as the source of kernel clock tick. | |
| 27 | */ | |
| 4b550488 | 28 | void __init plat_time_init(void) |
| a240a469 MZ |
29 | { |
| 30 | /* Disable GT64120 timers */ | |
| 31 | GT_WRITE(GT_TC_CONTROL_OFS, 0x00); | |
| 32 | GT_WRITE(GT_TC0_OFS, 0x00); | |
| 33 | GT_WRITE(GT_TC1_OFS, 0x00); | |
| 34 | GT_WRITE(GT_TC2_OFS, 0x00); | |
| 35 | GT_WRITE(GT_TC3_OFS, 0x00); | |
| 36 | ||
| 37 | /* Use MIPS compare/count internal timer */ | |
| 38 | mips_hpt_frequency = WRPPMC_CPU_CLK_FREQ; | |
| 39 | } |