From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/mips/wrppmc/time.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 arch/mips/wrppmc/time.c (limited to 'arch/mips/wrppmc/time.c') diff --git a/arch/mips/wrppmc/time.c b/arch/mips/wrppmc/time.c new file mode 100644 index 00000000..668dbd5f --- /dev/null +++ b/arch/mips/wrppmc/time.c @@ -0,0 +1,39 @@ +/* + * time.c: MIPS CPU Count/Compare timer hookup + * + * Author: Mark.Zhan, + * + * 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 +#include +#include + +#include +#include + +#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; +} -- cgit v1.3.1