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#if defined(CONFIG_EP93XX_EARLY_UART1)
  35#define UART_BASE               EP93XX_UART1_PHYS_BASE
  36#elif defined(CONFIG_EP93XX_EARLY_UART2)
  37#define UART_BASE               EP93XX_UART2_PHYS_BASE
  38#elif defined(CONFIG_EP93XX_EARLY_UART3)
  39#define UART_BASE               EP93XX_UART3_PHYS_BASE
  40#else
  41#define UART_BASE               EP93XX_UART1_PHYS_BASE
  42#endif
  43
  44#define PHYS_UART_DATA          (UART_BASE + 0x00)
  45#define PHYS_UART_FLAG          (UART_BASE + 0x18)
  46#define UART_FLAG_TXFF          0x20
  47
  48static inline void putc(int c)
  49{
  50        int i;
  51
  52        for (i = 0; i < 1000; i++) {
  53                /* Transmit fifo not full?  */
  54                if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF))
  55                        break;
  56        }
  57
  58        __raw_writeb(c, PHYS_UART_DATA);
  59}
  60
  61static inline void flush(void)
  62{
  63}
  64
  65
  66/*
  67 * Some bootloaders don't turn off DMA from the ethernet MAC before
  68 * jumping to linux, which means that we might end up with bits of RX
  69 * status and packet data scribbled over the uncompressed kernel image.
  70 * Work around this by resetting the ethernet MAC before we uncompress.
  71 */
  72#define PHYS_ETH_SELF_CTL               0x80010020
  73#define ETH_SELF_CTL_RESET              0x00000001
  74
  75static void ethernet_reset(void)
  76{
  77        unsigned int v;
  78
  79        /* Reset the ethernet MAC.  */
  80        v = __raw_readl(PHYS_ETH_SELF_CTL);
  81        __raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL);
  82
  83        /* Wait for reset to finish.  */
  84        while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET)
  85                ;
  86}
  87
  88
  89static void arch_decomp_setup(void)
  90{
  91        ethernet_reset();
  92}
  93
  94#define arch_decomp_wdog()
  95