2 * Setting up the clock on MSP SOCs. No RTC typically.
4 * Carsten Langgaard, carstenl@mips.com
5 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
7 * ########################################################################
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.
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
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.
22 * ########################################################################
25 #include <linux/init.h>
26 #include <linux/kernel_stat.h>
27 #include <linux/sched.h>
28 #include <linux/spinlock.h>
29 #include <linux/module.h>
30 #include <linux/ptrace.h>
32 #include <asm/mipsregs.h>
39 void __init plat_time_init(void)
42 unsigned long cpu_rate = 0;
45 s = prom_getenv("clkfreqhz");
46 cpu_rate = simple_strtoul(s, &endp, 10);
47 if (endp != NULL && *endp != 0) {
49 "Clock rate in Hz parse error: %s\n", s);
55 s = prom_getenv("clkfreq");
56 cpu_rate = 1000 * simple_strtoul(s, &endp, 10);
57 if (endp != NULL && *endp != 0) {
59 "Clock rate in MHz parse error: %s\n", s);
65 #if defined(CONFIG_PMC_MSP7120_EVAL) \
66 || defined(CONFIG_PMC_MSP7120_GW)
68 #elif defined(CONFIG_PMC_MSP7120_FPGA)
74 "Failed to determine CPU clock rate, "
75 "assuming %ld hz ...\n", cpu_rate);
78 printk(KERN_WARNING "Clock rate set to %ld\n", cpu_rate);
80 /* timer frequency is 1/2 clock rate */
81 mips_hpt_frequency = cpu_rate/2;
84 void __init plat_timer_setup(struct irqaction *irq)
86 #ifdef CONFIG_IRQ_MSP_CIC
87 /* we are using the vpe0 counter for timer interrupts */
88 setup_irq(MSP_INT_VPE0_TIMER, irq);
90 /* we are using the mips counter for timer interrupts */
91 setup_irq(MSP_INT_TIMER, irq);