kernel/2.6.29.6-aldebaran-rt/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/irq.h>
  10 #include <linux/sched.h>
  11 #include <linux/serial_8250.h>
  12 #include <linux/io.h>
  13
  14 #include <asm/setup.h>
  15 #include <asm/mach-types.h>
  16 #include <asm/leds.h>
  17 #include <asm/param.h>
  18
  19 #include <mach/hardware.h>
  20
  21 #include <asm/mach/map.h>
  22 #include <asm/mach/arch.h>
  23 #include <asm/mach/time.h>
  24
  25 static struct plat_serial8250_port serial_platform_data[] = {
  26         {
  27                 .iobase         = 0x3f8,
  28                 .irq            = 4,
  29                 .uartclk        = 1843200,
  30                 .regshift       = 0,
  31                 .iotype         = UPIO_PORT,
  32                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  33         },
  34         {
  35                 .iobase         = 0x2f8,
  36                 .irq            = 3,
  37                 .uartclk        = 1843200,
  38                 .regshift       = 0,
  39                 .iotype         = UPIO_PORT,
  40                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  41         },
  42         { },
  43 };
  44
  45 static struct platform_device serial_device = {
  46         .name                   = "serial8250",
  47         .id                     = PLAT8250_DEV_PLATFORM,
  48         .dev                    = {
  49                 .platform_data  = serial_platform_data,
  50         },
  51 };
  52
  53 static int __init shark_init(void)
  54 {
  55         int ret;
  56
  57         if (machine_is_shark())
  58                 ret = platform_device_register(&serial_device);
  59
  60         return ret;
  61 }
  62
  63 arch_initcall(shark_init);
  64
  65 extern void shark_init_irq(void);
  66
  67 static struct map_desc shark_io_desc[] __initdata = {
  68         {
  69                 .virtual        = IO_BASE,
  70                 .pfn            = __phys_to_pfn(IO_START),
  71                 .length         = IO_SIZE,
  72                 .type           = MT_DEVICE
  73         }
  74 };
  75
  76 static void __init shark_map_io(void)
  77 {
  78         iotable_init(shark_io_desc, ARRAY_SIZE(shark_io_desc));
  79 }
  80
  81 #define IRQ_TIMER 0
  82 #define HZ_TIME ((1193180 + HZ/2) / HZ)
  83
  84 static irqreturn_t
  85 shark_timer_interrupt(int irq, void *dev_id)
  86 {
  87         timer_tick();
  88         return IRQ_HANDLED;
  89 }
  90
  91 static struct irqaction shark_timer_irq = {
  92         .name           = "Shark Timer Tick",
  93         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
  94         .handler        = shark_timer_interrupt,
  95 };
  96
  97 /*
  98  * Set up timer interrupt, and return the current time in seconds.
  99  */
 100 static void __init shark_timer_init(void)
 101 {
 102         outb(0x34, 0x43);               /* binary, mode 0, LSB/MSB, Ch 0 */
 103         outb(HZ_TIME & 0xff, 0x40);     /* LSB of count */
 104         outb(HZ_TIME >> 8, 0x40);
 105
 106         setup_irq(IRQ_TIMER, &shark_timer_irq);
 107 }
 108
 109 static struct sys_timer shark_timer = {
 110         .init           = shark_timer_init,
 111 };
 112
 113 MACHINE_START(SHARK, "Shark")
 114         /* Maintainer: Alexander Schulz */
 115         .phys_io        = 0x40000000,
 116         .io_pg_offst    = ((0xe0000000) >> 18) & 0xfffc,
 117         .boot_params    = 0x08003000,
 118         .map_io         = shark_map_io,
 119         .init_irq       = shark_init_irq,
 120         .timer          = &shark_timer,
 121 MACHINE_END