arch/arm/mach-mxs/include/mach/uncompress.h

   1 /*
   2  *  arch/arm/mach-mxs/include/mach/uncompress.h
   3  *
   4  *  Copyright (C) 1999 ARM Limited
   5  *  Copyright (C) Shane Nay (shane@minirl.com)
   6  *  Copyright 2010 Freescale Semiconductor, Inc. All Rights Reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18 #ifndef __MACH_MXS_UNCOMPRESS_H__
  19 #define __MACH_MXS_UNCOMPRESS_H__
  20
  21 unsigned long mxs_duart_base;
  22
  23 #define MXS_DUART(x)    (*(volatile unsigned long *)(mxs_duart_base + (x)))
  24
  25 #define MXS_DUART_DR            0x00
  26 #define MXS_DUART_FR            0x18
  27 #define MXS_DUART_FR_TXFE       (1 << 7)
  28 #define MXS_DUART_CR            0x30
  29 #define MXS_DUART_CR_UARTEN     (1 << 0)
  30
  31 /*
  32  * The following code assumes the serial port has already been
  33  * initialized by the bootloader. If it's not, the output is
  34  * simply discarded.
  35  */
  36
  37 static void putc(int ch)
  38 {
  39         if (!mxs_duart_base)
  40                 return;
  41         if (!(MXS_DUART(MXS_DUART_CR) & MXS_DUART_CR_UARTEN))
  42                 return;
  43
  44         while (!(MXS_DUART(MXS_DUART_FR) & MXS_DUART_FR_TXFE))
  45                 barrier();
  46
  47         MXS_DUART(MXS_DUART_DR) = ch;
  48 }
  49
  50 static inline void flush(void)
  51 {
  52 }
  53
  54 #define MX23_DUART_BASE_ADDR    0x80070000
  55 #define MX28_DUART_BASE_ADDR    0x80074000
  56 #define MXS_DIGCTL_CHIPID       0x8001c310
  57
  58 static inline void __arch_decomp_setup(unsigned long arch_id)
  59 {
  60         u16 chipid = (*(volatile unsigned long *) MXS_DIGCTL_CHIPID) >> 16;
  61
  62         switch (chipid) {
  63         case 0x3780:
  64                 mxs_duart_base = MX23_DUART_BASE_ADDR;
  65                 break;
  66         case 0x2800:
  67                 mxs_duart_base = MX28_DUART_BASE_ADDR;
  68                 break;
  69         default:
  70                 break;
  71         }
  72 }
  73
  74 #define arch_decomp_setup()     __arch_decomp_setup(arch_id)
  75 #define arch_decomp_wdog()
  76
  77 #endif /* __MACH_MXS_UNCOMPRESS_H__ */