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/*
* arch/arm/mach-ep93xx/include/mach/uncompress.h
*
* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
*
* 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 < 10000; 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();
}
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