blob: 16026c2b1c8c0f36843baf6378e0114a22b0fa03 [file] [log] [blame]
Russell Kinga09e64f2008-08-05 16:14:15 +01001/*
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
Hartley Sweeten92e88aa2008-10-02 17:13:02 +010034#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
Russell Kinga09e64f2008-08-05 16:14:15 +010043
Hartley Sweeten92e88aa2008-10-02 17:13:02 +010044#define PHYS_UART_DATA (UART_BASE + 0x00)
45#define PHYS_UART_FLAG (UART_BASE + 0x18)
46#define UART_FLAG_TXFF 0x20
Russell Kinga09e64f2008-08-05 16:14:15 +010047
48static inline void putc(int c)
49{
50 int i;
51
52 for (i = 0; i < 1000; i++) {
53 /* Transmit fifo not full? */
Hartley Sweeten92e88aa2008-10-02 17:13:02 +010054 if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF))
Russell Kinga09e64f2008-08-05 16:14:15 +010055 break;
56 }
57
Hartley Sweeten92e88aa2008-10-02 17:13:02 +010058 __raw_writeb(c, PHYS_UART_DATA);
Russell Kinga09e64f2008-08-05 16:14:15 +010059}
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()