arch/arm/mach-gemini/board-dt.c

   1 /*
   2  * Gemini Device Tree boot support
   3  */
   4 #include <linux/kernel.h>
   5 #include <linux/init.h>
   6 #include <linux/io.h>
   7
   8 #include <asm/mach/arch.h>
   9 #include <asm/mach/map.h>
  10 #include <asm/system_misc.h>
  11 #include <asm/proc-fns.h>
  12
  13 #ifdef CONFIG_DEBUG_GEMINI
  14 /* This is needed for LL-debug/earlyprintk/debug-macro.S */
  15 static struct map_desc gemini_io_desc[] __initdata = {
  16         {
  17                 .virtual = CONFIG_DEBUG_UART_VIRT,
  18                 .pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS),
  19                 .length = SZ_4K,
  20                 .type = MT_DEVICE,
  21         },
  22 };
  23
  24 static void __init gemini_map_io(void)
  25 {
  26         iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc));
  27 }
  28 #else
  29 #define gemini_map_io NULL
  30 #endif
  31
  32 static void gemini_idle(void)
  33 {
  34         /*
  35          * Because of broken hardware we have to enable interrupts or the CPU
  36          * will never wakeup... Acctualy it is not very good to enable
  37          * interrupts first since scheduler can miss a tick, but there is
  38          * no other way around this. Platforms that needs it for power saving
  39          * should enable it in init code, since by default it is
  40          * disabled.
  41          */
  42
  43         /* FIXME: Enabling interrupts here is racy! */
  44         local_irq_enable();
  45         cpu_do_idle();
  46 }
  47
  48 static void __init gemini_init_machine(void)
  49 {
  50         arm_pm_idle = gemini_idle;
  51 }
  52
  53 static const char *gemini_board_compat[] = {
  54         "cortina,gemini",
  55         NULL,
  56 };
  57
  58 DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)")
  59         .map_io         = gemini_map_io,
  60         .init_machine   = gemini_init_machine,
  61         .dt_compat      = gemini_board_compat,
  62 MACHINE_END