LXR linux/arch/arm/mach-ep93xx/include/mach/uncompress.h

   1/*
   2 * arch/arm/mach-ep93xx/include/mach/uncompress.h
   3 *
   4 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or (at
   9 * your option) any later version.
  10 */
  11
  12#include <mach/ep93xx-regs.h>
  13
  14static unsigned char __raw_readb(unsigned int ptr)
  15{
  16        return *((volatile unsigned char *)ptr);
  17}
  18
  19static unsigned int __raw_readl(unsigned int ptr)
  20{
  21        return *((volatile unsigned int *)ptr);
  22}
  23
  24static void __raw_writeb(unsigned char value, unsigned int ptr)
  25{
  26        *((volatile unsigned char *)ptr) = value;
  27}
  28
  29static void __raw_writel(unsigned int value, unsigned int ptr)
  30{
  31        *((volatile unsigned int *)ptr) = value;
  32}
  33
  34#define PHYS_UART_DATA          (CONFIG_DEBUG_UART_PHYS + 0x00)
  35#define PHYS_UART_FLAG          (CONFIG_DEBUG_UART_PHYS + 0x18)
  36#define UART_FLAG_TXFF          0x20
  37
  38static inline void putc(int c)
  39{
  40        int i;
  41
  42        for (i = 0; i < 10000; i++) {
  43                /* Transmit fifo not full? */
  44                if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF))
  45                        break;
  46        }
  47
  48        __raw_writeb(c, PHYS_UART_DATA);
  49}
  50
  51static inline void flush(void)
  52{
  53}
  54
  55
  56/*
  57 * Some bootloaders don't turn off DMA from the ethernet MAC before
  58 * jumping to linux, which means that we might end up with bits of RX
  59 * status and packet data scribbled over the uncompressed kernel image.
  60 * Work around this by resetting the ethernet MAC before we uncompress.
  61 */
  62#define PHYS_ETH_SELF_CTL               0x80010020
  63#define ETH_SELF_CTL_RESET              0x00000001
  64
  65static void ethernet_reset(void)
  66{
  67        unsigned int v;
  68
  69        /* Reset the ethernet MAC.  */
  70        v = __raw_readl(PHYS_ETH_SELF_CTL);
  71        __raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL);
  72
  73        /* Wait for reset to finish.  */
  74        while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET)
  75                ;
  76}
  77
  78
  79static void arch_decomp_setup(void)
  80{
  81        ethernet_reset();
  82}
  83