95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/*
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* Setting up the clock on MSP SOCs. No RTC typically.
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*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
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*
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* ########################################################################
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* ########################################################################
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*/
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#include <linux/init.h>
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#include <linux/kernel_stat.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/ptrace.h>
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#include <asm/mipsregs.h>
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#include <asm/time.h>
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#include <msp_prom.h>
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#include <msp_int.h>
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#include <msp_regs.h>
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void __init msp_timer_init(void)
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{
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char *endp, *s;
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unsigned long cpu_rate = 0;
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if (cpu_rate == 0) {
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s = prom_getenv("clkfreqhz");
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cpu_rate = simple_strtoul(s, &endp, 10);
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if (endp != NULL && *endp != 0) {
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printk(KERN_ERR
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"Clock rate in Hz parse error: %s\n", s);
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cpu_rate = 0;
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}
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}
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if (cpu_rate == 0) {
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s = prom_getenv("clkfreq");
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cpu_rate = 1000 * simple_strtoul(s, &endp, 10);
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if (endp != NULL && *endp != 0) {
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printk(KERN_ERR
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"Clock rate in MHz parse error: %s\n", s);
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cpu_rate = 0;
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}
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}
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if (cpu_rate == 0) {
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#if defined(CONFIG_PMC_MSP7120_EVAL) \
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|| defined(CONFIG_PMC_MSP7120_GW)
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cpu_rate = 400000000;
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#elif defined(CONFIG_PMC_MSP7120_FPGA)
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cpu_rate = 25000000;
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#else
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cpu_rate = 150000000;
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#endif
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printk(KERN_ERR
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"Failed to determine CPU clock rate, "
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"assuming %ld hz ...\n", cpu_rate);
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}
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printk(KERN_WARNING "Clock rate set to %ld\n", cpu_rate);
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/* timer frequency is 1/2 clock rate */
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mips_hpt_frequency = cpu_rate/2;
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}
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void __init plat_timer_setup(struct irqaction *irq)
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{
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#ifdef CONFIG_IRQ_MSP_CIC
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/* we are using the vpe0 counter for timer interrupts */
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setup_irq(MSP_INT_VPE0_TIMER, irq);
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#else
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/* we are using the mips counter for timer interrupts */
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setup_irq(MSP_INT_TIMER, irq);
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#endif
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}
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