projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| e0b0f9e4 YS |
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 "do_timer()" routine every clocktick | |
| 65 | */ | |
| 66 | ||
| 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, | |
| e0b0f9e4 YS |
78 | }; |
| 79 | ||
| 80 | static const int __initdata divide_rate[] = {8, 64, 8192}; | |
| 81 | ||
| 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 | /* initalize 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 | } |