uncompress.h

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/*
 * arch/arm/mach-ep93xx/include/mach/uncompress.h
 *
 * Copyright (C) 2006 Lennert Buytenhek <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 */

#include <mach/ep93xx-regs.h>

static unsigned char __raw_readb(unsigned int ptr)
{
    return *((volatile unsigned char *)ptr);
}

static unsigned int __raw_readl(unsigned int ptr)
{
    return *((volatile unsigned int *)ptr);
}

static void __raw_writeb(unsigned char value, unsigned int ptr)
{
    *((volatile unsigned char *)ptr) = value;
}

static void __raw_writel(unsigned int value, unsigned int ptr)
{
    *((volatile unsigned int *)ptr) = value;
}

#if defined(CONFIG_EP93XX_EARLY_UART1)
#define UART_BASE       EP93XX_UART1_PHYS_BASE
#elif defined(CONFIG_EP93XX_EARLY_UART2)
#define UART_BASE       EP93XX_UART2_PHYS_BASE
#elif defined(CONFIG_EP93XX_EARLY_UART3)
#define UART_BASE       EP93XX_UART3_PHYS_BASE
#else
#define UART_BASE       EP93XX_UART1_PHYS_BASE
#endif

#define PHYS_UART_DATA      (UART_BASE + 0x00)
#define PHYS_UART_FLAG      (UART_BASE + 0x18)
#define UART_FLAG_TXFF      0x20

static inline void putc(int c)
{
    int i;

    for (i = 0; i < 1000; i++) {
        /* Transmit fifo not full?  */
        if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF))
            break;
    }

    __raw_writeb(c, PHYS_UART_DATA);
}

static inline void flush(void)
{
}


/*
 * Some bootloaders don't turn off DMA from the ethernet MAC before
 * jumping to linux, which means that we might end up with bits of RX
 * status and packet data scribbled over the uncompressed kernel image.
 * Work around this by resetting the ethernet MAC before we uncompress.
 */
#define PHYS_ETH_SELF_CTL       0x80010020
#define ETH_SELF_CTL_RESET      0x00000001

static void ethernet_reset(void)
{
    unsigned int v;

    /* Reset the ethernet MAC.  */
    v = __raw_readl(PHYS_ETH_SELF_CTL);
    __raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL);

    /* Wait for reset to finish.  */
    while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET)
        ;
}


static void arch_decomp_setup(void)
{
    ethernet_reset();
}

#define arch_decomp_wdog()