101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/*
|
|
* 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 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;
|
|
}
|