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