1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Carsten Langgaard, carstenl@mips.com 2 * Carsten Langgaard, carstenl@mips.com
4 * Copyright (C) 1999,2000 MIPS Technologies, 3 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
>> 4 *
>> 5 * This program is free software; you can distribute it and/or modify it
>> 6 * under the terms of the GNU General Public License (Version 2) as
>> 7 * published by the Free Software Foundation.
>> 8 *
>> 9 * This program is distributed in the hope it will be useful, but WITHOUT
>> 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>> 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
>> 12 * for more details.
>> 13 *
>> 14 * You should have received a copy of the GNU General Public License along
>> 15 * with this program; if not, write to the Free Software Foundation, Inc.,
>> 16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
5 * 17 *
6 * Setting up the clock on the MIPS boards. 18 * Setting up the clock on the MIPS boards.
7 */ 19 */
8 20
9 #include <linux/init.h> 21 #include <linux/init.h>
10 #include <linux/kernel_stat.h> 22 #include <linux/kernel_stat.h>
11 #include <linux/ptrace.h> 23 #include <linux/ptrace.h>
12 #include <linux/sched.h> 24 #include <linux/sched.h>
13 #include <linux/spinlock.h> 25 #include <linux/spinlock.h>
14 #include <linux/mc146818rtc.h> 26 #include <linux/mc146818rtc.h>
15 #include <linux/irq.h> 27 #include <linux/irq.h>
16 #include <linux/timex.h> 28 #include <linux/timex.h>
17 29
18 #include <asm/mipsregs.h> 30 #include <asm/mipsregs.h>
19 #include <asm/time.h> 31 #include <asm/time.h>
20 #include <asm/mach-rc32434/rc32434.h> 32 #include <asm/mach-rc32434/rc32434.h>
21 33
22 extern unsigned int idt_cpu_freq; 34 extern unsigned int idt_cpu_freq;
23 35
24 /* 36 /*
25 * Figure out the r4k offset, the amount to in 37 * Figure out the r4k offset, the amount to increment the compare
26 * register for each time tick. There is no RT 38 * register for each time tick. There is no RTC available.
27 * 39 *
28 * The RC32434 counts at half the CPU *core* s 40 * The RC32434 counts at half the CPU *core* speed.
29 */ 41 */
30 static unsigned long __init cal_r4koff(void) 42 static unsigned long __init cal_r4koff(void)
31 { 43 {
32 mips_hpt_frequency = idt_cpu_freq * ID 44 mips_hpt_frequency = idt_cpu_freq * IDT_CLOCK_MULT / 2;
33 45
34 return mips_hpt_frequency / HZ; 46 return mips_hpt_frequency / HZ;
35 } 47 }
36 48
37 void __init plat_time_init(void) 49 void __init plat_time_init(void)
38 { 50 {
39 unsigned int est_freq; 51 unsigned int est_freq;
40 unsigned long flags, r4k_offset; 52 unsigned long flags, r4k_offset;
41 53
42 local_irq_save(flags); 54 local_irq_save(flags);
43 55
44 printk(KERN_INFO "calculating r4koff.. 56 printk(KERN_INFO "calculating r4koff... ");
45 r4k_offset = cal_r4koff(); 57 r4k_offset = cal_r4koff();
46 printk("%08lx(%d)\n", r4k_offset, (int 58 printk("%08lx(%d)\n", r4k_offset, (int) r4k_offset);
47 59
48 est_freq = 2 * r4k_offset * HZ; 60 est_freq = 2 * r4k_offset * HZ;
49 est_freq += 5000; /* round */ 61 est_freq += 5000; /* round */
50 est_freq -= est_freq % 10000; 62 est_freq -= est_freq % 10000;
51 printk(KERN_INFO "CPU frequency %d.%02 63 printk(KERN_INFO "CPU frequency %d.%02d MHz\n", est_freq / 1000000,
52 (est_freq % 1000000) * 100 / 10 64 (est_freq % 1000000) * 100 / 1000000);
53 local_irq_restore(flags); 65 local_irq_restore(flags);
54 } 66 }
55 67
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