/* * linux/arch/m68k/hp300/time.c * * Copyright (C) 1998 Philip Blundell <philb@gnu.org> * * This file contains the HP300-specific time handling code. */ #include <asm/ptrace.h> #include <linux/types.h> #include <linux/init.h> #include <linux/sched.h> #include <linux/kernel_stat.h> #include <linux/interrupt.h> #include <asm/machdep.h> #include <asm/irq.h> #include <asm/io.h> #include <asm/system.h> #include <asm/traps.h> #include <asm/blinken.h> #include "ints.h" /* Clock hardware definitions */ #define CLOCKBASE 0xf05f8000 #define CLKCR1 0x1 #define CLKCR2 0x3 #define CLKCR3 CLKCR1 #define CLKSR CLKCR2 #define CLKMSB1 0x5 #define CLKMSB2 0x9 #define CLKMSB3 0xD /* This is for machines which generate the exact clock. */ #define USECS_PER_JIFFY (1000000/HZ) #define INTVAL ((10000 / 4) - 1) static irqreturn_t hp300_tick(int irq, void *dev_id, struct pt_regs *regs) { unsigned long tmp; irqreturn_t (*vector)(int, void *, struct pt_regs *) = dev_id; in_8(CLOCKBASE + CLKSR); asm volatile ("movpw %1@(5),%0" : "=d" (tmp) : "a" (CLOCKBASE)); /* Turn off the network and SCSI leds */ blinken_leds(0, 0xe0); return vector(irq, NULL, regs); } unsigned long hp300_gettimeoffset(void) { /* Read current timer 1 value */ unsigned char lsb, msb1, msb2; unsigned short ticks; msb1 = in_8(CLOCKBASE + 5); lsb = in_8(CLOCKBASE + 7); msb2 = in_8(CLOCKBASE + 5); if (msb1 != msb2) /* A carry happened while we were reading. Read it again */ lsb = in_8(CLOCKBASE + 7); ticks = INTVAL - ((msb2 << 8) | lsb); return (USECS_PER_JIFFY * ticks) / INTVAL; } void __init hp300_sched_init(irqreturn_t (*vector)(int, void *, struct pt_regs *)) { out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */ out_8(CLOCKBASE + CLKCR1, 0x1); /* reset */ asm volatile(" movpw %0,%1@(5)" : : "d" (INTVAL), "a" (CLOCKBASE)); cpu_request_irq(6, hp300_tick, IRQ_FLG_STD, "timer tick", vector); out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */ out_8(CLOCKBASE + CLKCR1, 0x40); /* enable irq */ }