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 67static 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 74static struct irqaction timer8_irq = { 75 .name = "timer-8", 76 .handler = timer_interrupt, 77 .flags = IRQF_DISABLED | IRQF_TIMER, 78}; 79 80static const int __initdata divide_rate[] = {8, 64, 8192}; 81 82void __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