90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2001-2006 Storlink, Corp.
|
||
|
|
* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*/
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <mach/hardware.h>
|
||
|
|
#include <mach/global_reg.h>
|
||
|
|
#include <asm/mach/time.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Register definitions for the timers
|
||
|
|
*/
|
||
|
|
#define TIMER_COUNT(BASE_ADDR) (BASE_ADDR + 0x00)
|
||
|
|
#define TIMER_LOAD(BASE_ADDR) (BASE_ADDR + 0x04)
|
||
|
|
#define TIMER_MATCH1(BASE_ADDR) (BASE_ADDR + 0x08)
|
||
|
|
#define TIMER_MATCH2(BASE_ADDR) (BASE_ADDR + 0x0C)
|
||
|
|
#define TIMER_CR(BASE_ADDR) (BASE_ADDR + 0x30)
|
||
|
|
|
||
|
|
#define TIMER_1_CR_ENABLE (1 << 0)
|
||
|
|
#define TIMER_1_CR_CLOCK (1 << 1)
|
||
|
|
#define TIMER_1_CR_INT (1 << 2)
|
||
|
|
#define TIMER_2_CR_ENABLE (1 << 3)
|
||
|
|
#define TIMER_2_CR_CLOCK (1 << 4)
|
||
|
|
#define TIMER_2_CR_INT (1 << 5)
|
||
|
|
#define TIMER_3_CR_ENABLE (1 << 6)
|
||
|
|
#define TIMER_3_CR_CLOCK (1 << 7)
|
||
|
|
#define TIMER_3_CR_INT (1 << 8)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* IRQ handler for the timer
|
||
|
|
*/
|
||
|
|
static irqreturn_t gemini_timer_interrupt(int irq, void *dev_id)
|
||
|
|
{
|
||
|
|
timer_tick();
|
||
|
|
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct irqaction gemini_timer_irq = {
|
||
|
|
.name = "Gemini Timer Tick",
|
||
|
|
.flags = IRQF_DISABLED | IRQF_TIMER,
|
||
|
|
.handler = gemini_timer_interrupt,
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Set up timer interrupt, and return the current time in seconds.
|
||
|
|
*/
|
||
|
|
void __init gemini_timer_init(void)
|
||
|
|
{
|
||
|
|
unsigned int tick_rate, reg_v;
|
||
|
|
|
||
|
|
reg_v = __raw_readl(IO_ADDRESS(GEMINI_GLOBAL_BASE + GLOBAL_STATUS));
|
||
|
|
tick_rate = REG_TO_AHB_SPEED(reg_v) * 1000000;
|
||
|
|
|
||
|
|
printk(KERN_INFO "Bus: %dMHz", tick_rate / 1000000);
|
||
|
|
|
||
|
|
tick_rate /= 6; /* APB bus run AHB*(1/6) */
|
||
|
|
|
||
|
|
switch(reg_v & CPU_AHB_RATIO_MASK) {
|
||
|
|
case CPU_AHB_1_1:
|
||
|
|
printk(KERN_CONT "(1/1)\n");
|
||
|
|
break;
|
||
|
|
case CPU_AHB_3_2:
|
||
|
|
printk(KERN_CONT "(3/2)\n");
|
||
|
|
break;
|
||
|
|
case CPU_AHB_24_13:
|
||
|
|
printk(KERN_CONT "(24/13)\n");
|
||
|
|
break;
|
||
|
|
case CPU_AHB_2_1:
|
||
|
|
printk(KERN_CONT "(2/1)\n");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Make irqs happen for the system timer
|
||
|
|
*/
|
||
|
|
setup_irq(IRQ_TIMER2, &gemini_timer_irq);
|
||
|
|
/* Start the timer */
|
||
|
|
__raw_writel(tick_rate / HZ, TIMER_COUNT(IO_ADDRESS(GEMINI_TIMER2_BASE)));
|
||
|
|
__raw_writel(tick_rate / HZ, TIMER_LOAD(IO_ADDRESS(GEMINI_TIMER2_BASE)));
|
||
|
|
__raw_writel(TIMER_2_CR_ENABLE | TIMER_2_CR_INT, TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
|
||
|
|
}
|