1 /*
2 * linux/arch/h8300/kernel/cpu/timer/timer8.c
3 *
4 * Yoshinori Sato <ysato@users.sourcefoge.jp>
5 *
6 * 8bit Timer Handler
7 *
8 */
9
10 #include <linux/errno.h>
11 #include <linux/sched.h>
12 #include <linux/kernel.h>
13 #include <linux/param.h>
14 #include <linux/string.h>
15 #include <linux/mm.h>
16 #include <linux/interrupt.h>
17 #include <linux/init.h>
18 #include <linux/profile.h>
19
20 #include <asm/io.h>
21 #include <asm/irq.h>
22 #include <asm/timer.h>
23 #if defined(CONFIG_CPU_H8300H)
24 #include <asm/regs306x.h>
25 #endif
26 #if defined(CONFIG_CPU_H8S)
27 #include <asm/regs267x.h>
28 #endif
29
30 /* 8bit timer x2 */
31 #define CMFA 6
32
33 #if defined(CONFIG_H8300_TIMER8_CH0)
34 #define _8BASE _8TCR0
35 #ifdef CONFIG_CPU_H8300H
36 #define _8IRQ 36
37 #endif
38 #ifdef CONFIG_CPU_H8S
39 #define _8IRQ 72
40 #endif
41 #elif defined(CONFIG_H8300_TIMER8_CH2)
42 #ifdef CONFIG_CPU_H8300H
43 #define _8BASE _8TCR2
44 #define _8IRQ 40
45 #endif
46 #endif
47
48 #ifndef _8BASE
49 #error Unknown timer channel.
50 #endif
51
52 #define _8TCR 0
53 #define _8TCSR 2
54 #define TCORA 4
55 #define TCORB 6
56 #define _8TCNT 8
57
58 #define CMIEA 0x40
59 #define CCLR_CMA 0x08
60 #define CKS2 0x04
61
62 /*
63 * timer_interrupt() needs to keep up the real-time clock,
64 * as well as call the "xtime_update()" routine every clocktick
65 */
66
timer_interrupt(int irq,void * dev_id)67 static irqreturn_t timer_interrupt(int irq, void *dev_id)
68 {
69 h8300_timer_tick();
70 ctrl_bclr(CMFA, _8BASE + _8TCSR);
71 return IRQ_HANDLED;
72 }
73
74 static struct irqaction timer8_irq = {
75 .name = "timer-8",
76 .handler = timer_interrupt,
77 .flags = IRQF_DISABLED | IRQF_TIMER,
78 };
79
80 static const int __initdata divide_rate[] = {8, 64, 8192};
81
h8300_timer_setup(void)82 void __init h8300_timer_setup(void)
83 {
84 unsigned int div;
85 unsigned int cnt;
86
87 calc_param(cnt, div, divide_rate, 0x10000);
88 div++;
89
90 setup_irq(_8IRQ, &timer8_irq);
91
92 #if defined(CONFIG_CPU_H8S)
93 /* Timer module enable */
94 ctrl_bclr(0, MSTPCRL)
95 #endif
96
97 /* initialize timer */
98 ctrl_outw(cnt, _8BASE + TCORA);
99 ctrl_outw(0x0000, _8BASE + _8TCSR);
100 ctrl_outw((CMIEA|CCLR_CMA|CKS2) << 8 | div,
101 _8BASE + _8TCR);
102 }
103