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