1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * Carsten Langgaard, carstenl@mips.com 3 * Carsten Langgaard, carstenl@mips.com
4 * Copyright (C) 1999,2000 MIPS Technologies, 4 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
5 * 5 *
6 * Setting up the clock on the MIPS boards. 6 * Setting up the clock on the MIPS boards.
7 */ 7 */
8 8
9 #include <linux/init.h> 9 #include <linux/init.h>
10 #include <linux/kernel_stat.h> 10 #include <linux/kernel_stat.h>
11 #include <linux/ptrace.h> 11 #include <linux/ptrace.h>
12 #include <linux/sched.h> 12 #include <linux/sched.h>
13 #include <linux/spinlock.h> 13 #include <linux/spinlock.h>
14 #include <linux/mc146818rtc.h> 14 #include <linux/mc146818rtc.h>
15 #include <linux/irq.h> 15 #include <linux/irq.h>
16 #include <linux/timex.h> 16 #include <linux/timex.h>
17 17
18 #include <asm/mipsregs.h> 18 #include <asm/mipsregs.h>
19 #include <asm/time.h> 19 #include <asm/time.h>
20 #include <asm/mach-rc32434/rc32434.h> 20 #include <asm/mach-rc32434/rc32434.h>
21 21
22 extern unsigned int idt_cpu_freq; 22 extern unsigned int idt_cpu_freq;
23 23
24 /* 24 /*
25 * Figure out the r4k offset, the amount to in 25 * Figure out the r4k offset, the amount to increment the compare
26 * register for each time tick. There is no RT 26 * register for each time tick. There is no RTC available.
27 * 27 *
28 * The RC32434 counts at half the CPU *core* s 28 * The RC32434 counts at half the CPU *core* speed.
29 */ 29 */
30 static unsigned long __init cal_r4koff(void) 30 static unsigned long __init cal_r4koff(void)
31 { 31 {
32 mips_hpt_frequency = idt_cpu_freq * ID 32 mips_hpt_frequency = idt_cpu_freq * IDT_CLOCK_MULT / 2;
33 33
34 return mips_hpt_frequency / HZ; 34 return mips_hpt_frequency / HZ;
35 } 35 }
36 36
37 void __init plat_time_init(void) 37 void __init plat_time_init(void)
38 { 38 {
39 unsigned int est_freq; 39 unsigned int est_freq;
40 unsigned long flags, r4k_offset; 40 unsigned long flags, r4k_offset;
41 41
42 local_irq_save(flags); 42 local_irq_save(flags);
43 43
44 printk(KERN_INFO "calculating r4koff.. 44 printk(KERN_INFO "calculating r4koff... ");
45 r4k_offset = cal_r4koff(); 45 r4k_offset = cal_r4koff();
46 printk("%08lx(%d)\n", r4k_offset, (int 46 printk("%08lx(%d)\n", r4k_offset, (int) r4k_offset);
47 47
48 est_freq = 2 * r4k_offset * HZ; 48 est_freq = 2 * r4k_offset * HZ;
49 est_freq += 5000; /* round */ 49 est_freq += 5000; /* round */
50 est_freq -= est_freq % 10000; 50 est_freq -= est_freq % 10000;
51 printk(KERN_INFO "CPU frequency %d.%02 51 printk(KERN_INFO "CPU frequency %d.%02d MHz\n", est_freq / 1000000,
52 (est_freq % 1000000) * 100 / 10 52 (est_freq % 1000000) * 100 / 1000000);
53 local_irq_restore(flags); 53 local_irq_restore(flags);
54 } 54 }
55 55
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