1/*
  2 * Setting up the clock on MSP SOCs.  No RTC typically.
  3 *
  4 * Carsten Langgaard, carstenl@mips.com
  5 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
  6 *
  7 * ########################################################################
  8 *
  9 *  This program is free software; you can distribute it and/or modify it
 10 *  under the terms of the GNU General Public License (Version 2) as
 11 *  published by the Free Software Foundation.
 12 *
 13 *  This program is distributed in the hope it will be useful, but WITHOUT
 14 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 15 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 16 *  for more details.
 17 *
 18 *  You should have received a copy of the GNU General Public License along
 19 *  with this program; if not, write to the Free Software Foundation, Inc.,
 20 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 21 *
 22 * ########################################################################
 23 */
 24
 25#include <linux/init.h>
 26#include <linux/kernel_stat.h>
 27#include <linux/sched.h>
 28#include <linux/spinlock.h>
 29#include <linux/ptrace.h>
 30
 31#include <asm/cevt-r4k.h>
 32#include <asm/mipsregs.h>
 33#include <asm/time.h>
 34
 35#include <msp_prom.h>
 36#include <msp_int.h>
 37#include <msp_regs.h>
 38
 39#define get_current_vpe()   \
 40	((read_c0_tcbind() >> TCBIND_CURVPE_SHIFT) & TCBIND_CURVPE)
 41
 42static struct irqaction timer_vpe1;
 43static int tim_installed;
 44
 45void __init plat_time_init(void)
 46{
 47	char	*endp, *s;
 48	unsigned long cpu_rate = 0;
 49
 50	if (cpu_rate == 0) {
 51		s = prom_getenv("clkfreqhz");
 52		cpu_rate = simple_strtoul(s, &endp, 10);
 53		if (endp != NULL && *endp != 0) {
 54			printk(KERN_ERR
 55				"Clock rate in Hz parse error: %s\n", s);
 56			cpu_rate = 0;
 57		}
 58	}
 59
 60	if (cpu_rate == 0) {
 61		s = prom_getenv("clkfreq");
 62		cpu_rate = 1000 * simple_strtoul(s, &endp, 10);
 63		if (endp != NULL && *endp != 0) {
 64			printk(KERN_ERR
 65				"Clock rate in MHz parse error: %s\n", s);
 66			cpu_rate = 0;
 67		}
 68	}
 69
 70	if (cpu_rate == 0) {
 71#if defined(CONFIG_PMC_MSP7120_EVAL) \
 72 || defined(CONFIG_PMC_MSP7120_GW)
 73		cpu_rate = 400000000;
 74#elif defined(CONFIG_PMC_MSP7120_FPGA)
 75		cpu_rate = 25000000;
 76#else
 77		cpu_rate = 150000000;
 78#endif
 79		printk(KERN_ERR
 80			"Failed to determine CPU clock rate, "
 81			"assuming %ld hz ...\n", cpu_rate);
 82	}
 83
 84	printk(KERN_WARNING "Clock rate set to %ld\n", cpu_rate);
 85
 86	/* timer frequency is 1/2 clock rate */
 87	mips_hpt_frequency = cpu_rate/2;
 88}
 89
 90unsigned int get_c0_compare_int(void)
 91{
 92	/* MIPS_MT modes may want timer for second VPE */
 93	if ((get_current_vpe()) && !tim_installed) {
 94		memcpy(&timer_vpe1, &c0_compare_irqaction, sizeof(timer_vpe1));
 95		setup_irq(MSP_INT_VPE1_TIMER, &timer_vpe1);
 96		tim_installed++;
 97	}
 98
 99	return get_current_vpe() ? MSP_INT_VPE1_TIMER : MSP_INT_VPE0_TIMER;
100}