arch/arm/mach-ns9xxx/processor-ns9360.c

   1 /*
   2  * arch/arm/mach-ns9xxx/processor-ns9360.c
   3  *
   4  * Copyright (C) 2007 by Digi International Inc.
   5  * All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  */
  11 #include <linux/io.h>
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14
  15 #include <asm/page.h>
  16 #include <asm/mach/map.h>
  17 #include <asm/arch-ns9xxx/processor-ns9360.h>
  18 #include <asm/arch-ns9xxx/regs-sys-ns9360.h>
  19
  20 void ns9360_reset(char mode)
  21 {
  22         u32 reg;
  23
  24         reg = __raw_readl(SYS_PLL) >> 16;
  25         REGSET(reg, SYS_PLL, SWC, YES);
  26         __raw_writel(reg, SYS_PLL);
  27 }
  28
  29 #define CRYSTAL 29491200 /* Hz */
  30 unsigned long ns9360_systemclock(void)
  31 {
  32         u32 pll = __raw_readl(SYS_PLL);
  33         return CRYSTAL * (REGGETIM(pll, SYS_PLL, ND) + 1)
  34                 >> REGGETIM(pll, SYS_PLL, FS);
  35 }
  36
  37 static struct map_desc ns9360_io_desc[] __initdata = {
  38         { /* BBus */
  39                 .virtual = io_p2v(0x90000000),
  40                 .pfn = __phys_to_pfn(0x90000000),
  41                 .length = 0x00700000,
  42                 .type = MT_DEVICE,
  43         }, { /* AHB */
  44                 .virtual = io_p2v(0xa0100000),
  45                 .pfn = __phys_to_pfn(0xa0100000),
  46                 .length = 0x00900000,
  47                 .type = MT_DEVICE,
  48         },
  49 };
  50
  51 void __init ns9360_map_io(void)
  52 {
  53         iotable_init(ns9360_io_desc, ARRAY_SIZE(ns9360_io_desc));
  54 }