arch/arm/mach-h720x/cpu-h7201.c

   1 /*
   2  * linux/arch/arm/mach-h720x/cpu-h7201.c
   3  *
   4  * Copyright (C) 2003 Thomas Gleixner <tglx@linutronix.de>
   5  *               2003 Robert Schwebel <r.schwebel@pengutronix.de>
   6  *               2004 Sascha Hauer    <s.hauer@pengutronix.de>
   7  *
   8  * processor specific stuff for the Hynix h7201
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/module.h>
  19 #include <asm/types.h>
  20 #include <asm/hardware.h>
  21 #include <asm/irq.h>
  22 #include <asm/arch/irqs.h>
  23 #include <asm/mach/irq.h>
  24 #include <asm/mach/time.h>
  25
  26 extern unsigned long h720x_gettimeoffset(void);
  27 extern void __init h720x_init_irq (void);
  28
  29 /*
  30  * Timer interrupt handler
  31  */
  32 static irqreturn_t
  33 h7201_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  34 {
  35         CPU_REG (TIMER_VIRT, TIMER_TOPSTAT);
  36         timer_tick(regs);
  37         return IRQ_HANDLED;
  38 }
  39
  40 static struct irqaction h7201_timer_irq = {
  41         .name           = "h7201 Timer Tick",
  42         .flags          = SA_INTERRUPT,
  43         .handler        = h7201_timer_interrupt
  44 };
  45
  46 /*
  47  * Setup TIMER0 as system timer
  48  */
  49 void __init h7201_init_time(void)
  50 {
  51         gettimeoffset = h720x_gettimeoffset;
  52
  53         CPU_REG (TIMER_VIRT, TM0_PERIOD) = LATCH;
  54         CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_RESET;
  55         CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_REPEAT | TM_START;
  56         CPU_REG (TIMER_VIRT, TIMER_TOPCTRL) = ENABLE_TM0_INTR | TIMER_ENABLE_BIT;
  57
  58         setup_irq(IRQ_TIMER0, &h7201_timer_irq);
  59 }