time.c revision 1c0c13eb935c95fd2ca0b0aca6dd4860487fb242
11c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno/* 21c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> 31c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * 41c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * This program is free software; you can redistribute it and/or modify it 51c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * under the terms of the GNU General Public License as published by the 61c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * Free Software Foundation; either version 2 of the License, or (at your 71c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * option) any later version. 81c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * 91c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 101c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 111c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 121c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 131c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 141c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 151c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 161c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 171c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 181c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 191c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * 201c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * You should have received a copy of the GNU General Public License along 211c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * with this program; if not, write to the Free Software Foundation, Inc., 221c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * 675 Mass Ave, Cambridge, MA 02139, USA. 231c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno */ 241c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno 251c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno 261c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno#include <linux/init.h> 271c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno#include <linux/ssb/ssb.h> 281c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno#include <asm/time.h> 291c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno#include <bcm47xx.h> 301c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno 311c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarnovoid __init 321c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarnobcm47xx_time_init(void) 331c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno{ 341c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno unsigned long hz; 351c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno 361c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno /* 371c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * Use deterministic values for initial counter interrupt 381c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno * so that calibrate delay avoids encountering a counter wrap. 391c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno */ 401c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno write_c0_count(0); 411c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno write_c0_compare(0xffff); 421c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno 431c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno hz = ssb_cpu_clock(&ssb_bcm47xx.mipscore) / 2; 441c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno if (!hz) 451c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno hz = 100000000; 461c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno 471c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno /* Set MIPS counter frequency for fixed_rate_gettimeoffset() */ 481c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno mips_hpt_frequency = hz; 491c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno} 501c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno 511c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarnovoid __init 521c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarnoplat_timer_setup(struct irqaction *irq) 531c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno{ 541c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno /* Enable the timer interrupt */ 551c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno setup_irq(7, irq); 561c0c13eb935c95fd2ca0b0aca6dd4860487fb242Aurelien Jarno} 57