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
  13 #include <asm/setup.h>
  14 #include <asm/mach-types.h>
  15 #include <asm/io.h>
  16 #include <asm/leds.h>
  17 #include <asm/param.h>
  18
  19 #include <asm/mach/map.h>
  20 #include <asm/mach/arch.h>
  21 #include <asm/mach/time.h>
  22
  23 static struct plat_serial8250_port serial_platform_data[] = {
  24         {
  25                 .iobase         = 0x3f8,
  26                 .irq            = 4,
  27                 .uartclk        = 1843200,
  28                 .regshift       = 0,
  29                 .iotype         = UPIO_PORT,
  30                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  31         },
  32         {
  33                 .iobase         = 0x2f8,
  34                 .irq            = 3,
  35                 .uartclk        = 1843200,
  36                 .regshift       = 0,
  37                 .iotype         = UPIO_PORT,
  38                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  39         },
  40         { },
  41 };
  42
  43 static struct platform_device serial_device = {
  44         .name                   = "serial8250",
  45         .id                     = PLAT8250_DEV_PLATFORM,
  46         .dev                    = {
  47                 .platform_data  = serial_platform_data,
  48         },
  49 };
  50
  51 static int __init shark_init(void)
  52 {
  53         int ret;
  54
  55         if (machine_is_shark())
  56                 ret = platform_device_register(&serial_device);
  57
  58         return ret;
  59 }
  60
  61 arch_initcall(shark_init);
  62
  63 extern void shark_init_irq(void);
  64
  65 static struct map_desc shark_io_desc[] __initdata = {
  66         {
  67                 .virtual        = IO_BASE,
  68                 .pfn            = __phys_to_pfn(IO_START),
  69                 .length         = IO_SIZE,
  70                 .type           = MT_DEVICE
  71         }
  72 };
  73
  74 static void __init shark_map_io(void)
  75 {
  76         iotable_init(shark_io_desc, ARRAY_SIZE(shark_io_desc));
  77 }
  78
  79 #define IRQ_TIMER 0
  80 #define HZ_TIME ((1193180 + HZ/2) / HZ)
  81
  82 static irqreturn_t
  83 shark_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  84 {
  85         write_seqlock(&xtime_lock);
  86         timer_tick(regs);
  87         write_sequnlock(&xtime_lock);
  88         return IRQ_HANDLED;
  89 }
  90
  91 static struct irqaction shark_timer_irq = {
  92         .name           = "Shark Timer Tick",
  93         .flags          = IRQF_DISABLED | IRQF_TIMER,
  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