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 #include <asm/mach-types.h>
  22
  23 unsigned long mxs_duart_base;
  24
  25 #define MXS_DUART(x)    (*(volatile unsigned long *)(mxs_duart_base + (x)))
  26
  27 #define MXS_DUART_DR            0x00
  28 #define MXS_DUART_FR            0x18
  29 #define MXS_DUART_FR_TXFE       (1 << 7)
  30 #define MXS_DUART_CR            0x30
  31 #define MXS_DUART_CR_UARTEN     (1 << 0)
  32
  33 /*
  34  * The following code assumes the serial port has already been
  35  * initialized by the bootloader. If it's not, the output is
  36  * simply discarded.
  37  */
  38
  39 static void putc(int ch)
  40 {
  41         if (!mxs_duart_base)
  42                 return;
  43         if (!(MXS_DUART(MXS_DUART_CR) & MXS_DUART_CR_UARTEN))
  44                 return;
  45
  46         while (!(MXS_DUART(MXS_DUART_FR) & MXS_DUART_FR_TXFE))
  47                 barrier();
  48
  49         MXS_DUART(MXS_DUART_DR) = ch;
  50 }
  51
  52 static inline void flush(void)
  53 {
  54 }
  55
  56 #define MX23_DUART_BASE_ADDR    0x80070000
  57 #define MX28_DUART_BASE_ADDR    0x80074000
  58
  59 static inline void __arch_decomp_setup(unsigned long arch_id)
  60 {
  61         switch (arch_id) {
  62         case MACH_TYPE_MX23EVK:
  63                 mxs_duart_base = MX23_DUART_BASE_ADDR;
  64                 break;
  65         case MACH_TYPE_MX28EVK:
  66         case MACH_TYPE_M28EVK:
  67         case MACH_TYPE_TX28:
  68                 mxs_duart_base = MX28_DUART_BASE_ADDR;
  69                 break;
  70         default:
  71                 break;
  72         }
  73 }
  74
  75 #define arch_decomp_setup()     __arch_decomp_setup(arch_id)
  76 #define arch_decomp_wdog()
  77
  78 #endif /* __MACH_MXS_UNCOMPRESS_H__ */