arch/arm/mach-at91/at91x40.c

   1 /*
   2  * arch/arm/mach-at91/at91x40.c
   3  *
   4  * (C) Copyright 2007, Greg Ungerer <gerg@snapgear.com>
   5  * Copyright (C) 2005 SAN People
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/irq.h>
  16 #include <linux/io.h>
  17 #include <asm/proc-fns.h>
  18 #include <asm/system_misc.h>
  19 #include <asm/mach/arch.h>
  20 #include <mach/at91x40.h>
  21 #include <mach/at91_st.h>
  22 #include <mach/timex.h>
  23
  24 #include "at91_aic.h"
  25 #include "generic.h"
  26
  27 /*
  28  * Export the clock functions for the AT91X40. Some external code common
  29  * to all AT91 family parts relys on this, like the gpio and serial support.
  30  */
  31 int clk_enable(struct clk *clk)
  32 {
  33         return 0;
  34 }
  35
  36 void clk_disable(struct clk *clk)
  37 {
  38 }
  39
  40 unsigned long clk_get_rate(struct clk *clk)
  41 {
  42         return AT91X40_MASTER_CLOCK;
  43 }
  44
  45 static void at91x40_idle(void)
  46 {
  47         /*
  48          * Disable the processor clock.  The processor will be automatically
  49          * re-enabled by an interrupt or by a reset.
  50          */
  51         __raw_writel(AT91_PS_CR_CPU, AT91_IO_P2V(AT91_PS_CR));
  52         cpu_do_idle();
  53 }
  54
  55 void __init at91x40_initialize(unsigned long main_clock)
  56 {
  57         arm_pm_idle = at91x40_idle;
  58 }
  59
  60 /*
  61  * The default interrupt priority levels (0 = lowest, 7 = highest).
  62  */
  63 static unsigned int at91x40_default_irq_priority[NR_AIC_IRQS] __initdata = {
  64         7,      /* Advanced Interrupt Controller (FIQ) */
  65         0,      /* System Peripherals */
  66         0,      /* USART 0 */
  67         0,      /* USART 1 */
  68         2,      /* Timer Counter 0 */
  69         2,      /* Timer Counter 1 */
  70         2,      /* Timer Counter 2 */
  71         0,      /* Watchdog timer */
  72         0,      /* Parallel IO Controller A */
  73         0,      /* Reserved */
  74         0,      /* Reserved */
  75         0,      /* Reserved */
  76         0,      /* Reserved */
  77         0,      /* Reserved */
  78         0,      /* Reserved */
  79         0,      /* Reserved */
  80         0,      /* External IRQ0 */
  81         0,      /* External IRQ1 */
  82         0,      /* External IRQ2 */
  83 };
  84
  85 void __init at91x40_init_interrupts(unsigned int priority[NR_AIC_IRQS])
  86 {
  87         u32  extern_irq = (1 << AT91X40_ID_IRQ0) | (1 << AT91X40_ID_IRQ1)
  88                         | (1 << AT91X40_ID_IRQ2);
  89         if (!priority)
  90                 priority = at91x40_default_irq_priority;
  91
  92         at91_aic_init(priority, extern_irq);
  93 }