1 /*
2 * linux/arch/h8300/kernel/timer/itu.c
3 *
4 * Yoshinori Sato <ysato@users.sourcefoge.jp>
5 *
6 * ITU 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/timex.h>
19
20 #include <asm/segment.h>
21 #include <asm/io.h>
22 #include <asm/irq.h>
23 #include <asm/regs306x.h>
24
25 #if CONFIG_H8300_ITU_CH == 0
26 #define ITUBASE 0xffff64
27 #define ITUIRQ 24
28 #elif CONFIG_H8300_ITU_CH == 1
29 #define ITUBASE 0xffff6e
30 #define ITUIRQ 28
31 #elif CONFIG_H8300_ITU_CH == 2
32 #define ITUBASE 0xffff78
33 #define ITUIRQ 32
34 #elif CONFIG_H8300_ITU_CH == 3
35 #define ITUBASE 0xffff82
36 #define ITUIRQ 36
37 #elif CONFIG_H8300_ITU_CH == 4
38 #define ITUBASE 0xffff92
39 #define ITUIRQ 40
40 #else
41 #error Unknown timer channel.
42 #endif
43
44 #define TCR 0
45 #define TIOR 1
46 #define TIER 2
47 #define TSR 3
48 #define TCNT 4
49 #define GRA 6
50 #define GRB 8
51
timer_interrupt(int irq,void * dev_id)52 static irqreturn_t timer_interrupt(int irq, void *dev_id)
53 {
54 h8300_timer_tick();
55 ctrl_bclr(IMFA, ITUBASE + TSR);
56 return IRQ_HANDLED;
57 }
58
59 static struct irqaction itu_irq = {
60 .name = "itu",
61 .handler = timer_interrupt,
62 .flags = IRQF_DISABLED | IRQF_TIMER,
63 };
64
65 static const int __initdata divide_rate[] = {1, 2, 4, 8};
66
h8300_timer_setup(void)67 void __init h8300_timer_setup(void)
68 {
69 unsigned int div;
70 unsigned int cnt;
71
72 calc_param(cnt, div, divide_rate, 0x10000);
73
74 setup_irq(ITUIRQ, &itu_irq);
75
76 /* initialize timer */
77 ctrl_outb(0, TSTR);
78 ctrl_outb(CCLR0 | div, ITUBASE + TCR);
79 ctrl_outb(0x01, ITUBASE + TIER);
80 ctrl_outw(cnt, ITUBASE + GRA);
81 ctrl_bset(CONFIG_H8300_ITU_CH, TSTR);
82 }
83