/* * Setting up the clock on MSP SOCs. No RTC typically. * * Carsten Langgaard, carstenl@mips.com * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved. * * ######################################################################## * * This program is free software; you can distribute it and/or modify it * under the terms of the GNU General Public License (Version 2) as * published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. * * ######################################################################## */ #include <linux/init.h> #include <linux/kernel_stat.h> #include <linux/sched.h> #include <linux/spinlock.h> #include <linux/module.h> #include <linux/ptrace.h> #include <asm/cevt-r4k.h> #include <asm/mipsregs.h> #include <asm/time.h> #include <msp_prom.h> #include <msp_int.h> #include <msp_regs.h> #define get_current_vpe() \ ((read_c0_tcbind() >> TCBIND_CURVPE_SHIFT) & TCBIND_CURVPE) static struct irqaction timer_vpe1; static int tim_installed; void __init plat_time_init(void) { char *endp, *s; unsigned long cpu_rate = 0; if (cpu_rate == 0) { s = prom_getenv("clkfreqhz"); cpu_rate = simple_strtoul(s, &endp, 10); if (endp != NULL && *endp != 0) { printk(KERN_ERR "Clock rate in Hz parse error: %s\n", s); cpu_rate = 0; } } if (cpu_rate == 0) { s = prom_getenv("clkfreq"); cpu_rate = 1000 * simple_strtoul(s, &endp, 10); if (endp != NULL && *endp != 0) { printk(KERN_ERR "Clock rate in MHz parse error: %s\n", s); cpu_rate = 0; } } if (cpu_rate == 0) { #if defined(CONFIG_PMC_MSP7120_EVAL) \ || defined(CONFIG_PMC_MSP7120_GW) cpu_rate = 400000000; #elif defined(CONFIG_PMC_MSP7120_FPGA) cpu_rate = 25000000; #else cpu_rate = 150000000; #endif printk(KERN_ERR "Failed to determine CPU clock rate, " "assuming %ld hz ...\n", cpu_rate); } printk(KERN_WARNING "Clock rate set to %ld\n", cpu_rate); /* timer frequency is 1/2 clock rate */ mips_hpt_frequency = cpu_rate/2; } unsigned int __cpuinit get_c0_compare_int(void) { /* MIPS_MT modes may want timer for second VPE */ if ((get_current_vpe()) && !tim_installed) { memcpy(&timer_vpe1, &c0_compare_irqaction, sizeof(timer_vpe1)); setup_irq(MSP_INT_VPE1_TIMER, &timer_vpe1); tim_installed++; } return get_current_vpe() ? MSP_INT_VPE1_TIMER : MSP_INT_VPE0_TIMER; }