arch/arm/mach-shark/core.c

   1 /*
   2  *  linux/arch/arm/mach-shark/arch.c
   3  *
   4  *  Architecture specific stuff.
   5  */
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/sched.h>
  10
  11 #include <asm/setup.h>
  12 #include <asm/mach-types.h>
  13 #include <asm/io.h>
  14 #include <asm/leds.h>
  15 #include <asm/param.h>
  16
  17 #include <asm/mach/map.h>
  18 #include <asm/mach/arch.h>
  19 #include <asm/mach/time.h>
  20
  21 extern void shark_init_irq(void);
  22
  23 static struct map_desc shark_io_desc[] __initdata = {
  24         { IO_BASE       , IO_START      , IO_SIZE       , MT_DEVICE }
  25 };
  26
  27 static void __init shark_map_io(void)
  28 {
  29         iotable_init(shark_io_desc, ARRAY_SIZE(shark_io_desc));
  30 }
  31
  32 #define IRQ_TIMER 0
  33 #define HZ_TIME ((1193180 + HZ/2) / HZ)
  34
  35 static irqreturn_t
  36 shark_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  37 {
  38         timer_tick(regs);
  39
  40         return IRQ_HANDLED;
  41 }
  42
  43 static struct irqaction shark_timer_irq = {
  44         .name           = "Shark Timer Tick",
  45         .flags          = SA_INTERRUPT,
  46         .handler        = shark_timer_interrupt
  47 };
  48
  49 /*
  50  * Set up timer interrupt, and return the current time in seconds.
  51  */
  52 void __init shark_init_time(void)
  53 {
  54         unsigned long flags;
  55
  56         outb(0x34, 0x43);               /* binary, mode 0, LSB/MSB, Ch 0 */
  57         outb(HZ_TIME & 0xff, 0x40);     /* LSB of count */
  58         outb(HZ_TIME >> 8, 0x40);
  59
  60         setup_irq(IRQ_TIMER, &shark_timer_irq);
  61 }
  62
  63
  64 MACHINE_START(SHARK, "Shark")
  65         MAINTAINER("Alexander Schulz")
  66         BOOT_MEM(0x08000000, 0x40000000, 0xe0000000)
  67         BOOT_PARAMS(0x08003000)
  68         MAPIO(shark_map_io)
  69         INITIRQ(shark_init_irq)
  70         INITTIME(shark_init_time)
  71 MACHINE_END