arch/arm/plat-mxc/include/mach/uncompress.h

   1 /*
   2  *  arch/arm/plat-mxc/include/mach/uncompress.h
   3  *
   4  *
   5  *
   6  *  Copyright (C) 1999 ARM Limited
   7  *  Copyright (C) Shane Nay (shane@minirl.com)
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23 #ifndef __ASM_ARCH_MXC_UNCOMPRESS_H__
  24 #define __ASM_ARCH_MXC_UNCOMPRESS_H__
  25
  26 #define __MXC_BOOT_UNCOMPRESS
  27
  28 #include <mach/hardware.h>
  29
  30 #define UART(x) (*(volatile unsigned long *)(serial_port + (x)))
  31
  32 #define USR2 0x98
  33 #define USR2_TXFE (1<<14)
  34 #define TXR  0x40
  35 #define UCR1 0x80
  36 #define UCR1_UARTEN 1
  37
  38 /*
  39  * The following code assumes the serial port has already been
  40  * initialized by the bootloader.  We search for the first enabled
  41  * port in the most probable order.  If you didn't setup a port in
  42  * your bootloader then nothing will appear (which might be desired).
  43  *
  44  * This does not append a newline
  45  */
  46
  47 static void putc(int ch)
  48 {
  49         static unsigned long serial_port = 0;
  50
  51         if (unlikely(serial_port == 0)) {
  52                 do {
  53                         serial_port = UART1_BASE_ADDR;
  54                         if (UART(UCR1) & UCR1_UARTEN)
  55                                 break;
  56                         serial_port = UART2_BASE_ADDR;
  57                         if (UART(UCR1) & UCR1_UARTEN)
  58                                 break;
  59                         return;
  60                 } while (0);
  61         }
  62
  63         while (!(UART(USR2) & USR2_TXFE))
  64                 barrier();
  65
  66         UART(TXR) = ch;
  67 }
  68
  69 #define flush() do { } while (0)
  70
  71 /*
  72  * nothing to do
  73  */
  74 #define arch_decomp_setup()
  75
  76 #define arch_decomp_wdog()
  77
  78 #endif                          /* __ASM_ARCH_MXC_UNCOMPRESS_H__ */