include/asm-arm/arch-sa1100/uncompress.h

   1 /*
   2  * linux/include/asm-arm/arch-brutus/uncompress.h
   3  *
   4  * (C) 1999 Nicolas Pitre <nico@cam.org>
   5  *
   6  * Reorganised to be machine independent.
   7  */
   8
   9 #include "hardware.h"
  10
  11 /*
  12  * The following code assumes the serial port has already been
  13  * initialized by the bootloader.  We search for the first enabled
  14  * port in the most probable order.  If you didn't setup a port in
  15  * your bootloader then nothing will appear (which might be desired).
  16  */
  17
  18 #define UART(x)         (*(volatile unsigned long *)(serial_port + (x)))
  19
  20 static void putc(int c)
  21 {
  22         unsigned long serial_port;
  23
  24         do {
  25                 serial_port = _Ser3UTCR0;
  26                 if (UART(UTCR3) & UTCR3_TXE) break;
  27                 serial_port = _Ser1UTCR0;
  28                 if (UART(UTCR3) & UTCR3_TXE) break;
  29                 serial_port = _Ser2UTCR0;
  30                 if (UART(UTCR3) & UTCR3_TXE) break;
  31                 return;
  32         } while (0);
  33
  34         /* wait for space in the UART's transmitter */
  35         while (!(UART(UTSR1) & UTSR1_TNF))
  36                 barrier();
  37
  38         /* send the character out. */
  39         UART(UTDR) = c;
  40 }
  41
  42 static inline void flush(void)
  43 {
  44 }
  45
  46 /*
  47  * Nothing to do for these
  48  */
  49 #define arch_decomp_setup()
  50 #define arch_decomp_wdog()