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

   1 /*
   2  * linux/include/asm-arm/arch-nexuspci/uncompress.h
   3  *
   4  * Copyright (C) 1998, 1999, 2000 Philip Blundell
   5  */
   6
   7 #include <asm/hardware.h>
   8 #include <asm/io.h>
   9
  10 /*
  11  * Write a character to the UART
  12  */
  13 void _ll_write_char(char c)
  14 {
  15         while (!(__raw_readb(DUART_START + 0x4) & 0x4))
  16                 ;
  17         __raw_writeb(c, DUART_START + 0xc);
  18 }
  19
  20 /*
  21  * This does not append a newline
  22  */
  23 static void puts(const char *s)
  24 {
  25         while (*s) {
  26                 if (*s == '\n')
  27                         _ll_write_char('\r');
  28                 _ll_write_char(*(s++));
  29         }
  30 }
  31
  32 /*
  33  * Set up for decompression
  34  */
  35 static void arch_decomp_setup(void)
  36 {
  37         /* LED off */
  38         __raw_writel(INTCONT_LED, INTCONT_START);
  39
  40         /* Set up SCC */
  41         __raw_writeb(42, DUART_START + 8);
  42         __raw_writeb(48, DUART_START + 8);
  43         __raw_writeb(16, DUART_START + 8);
  44         __raw_writeb(0x93, DUART_START);
  45         __raw_writeb(0x17, DUART_START);
  46         __raw_writeb(0xbb, DUART_START + 4);
  47         __raw_writeb(0x78, DUART_START + 16);
  48         __raw_writeb(0xa0, DUART_START + 8);
  49         __raw_writeb(5, DUART_START + 8);
  50 }
  51
  52 /*
  53  * Stroke the watchdog so we don't get reset during decompression.
  54  */
  55 static inline void arch_decomp_wdog(void)
  56 {
  57         __raw_writel(INTCONT_WATCHDOG, INTCONT_START);
  58         __raw_writel(INTCONT_WATCHDOG | 1, INTCONT_START);
  59 }