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