2 * arch/arm/mach-ep93xx/include/mach/uncompress.h
4 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
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.
12 #include <mach/ep93xx-regs.h>
14 static unsigned char __raw_readb(unsigned int ptr)
16 return *((volatile unsigned char *)ptr);
19 static unsigned int __raw_readl(unsigned int ptr)
21 return *((volatile unsigned int *)ptr);
24 static void __raw_writeb(unsigned char value, unsigned int ptr)
26 *((volatile unsigned char *)ptr) = value;
29 static void __raw_writel(unsigned int value, unsigned int ptr)
31 *((volatile unsigned int *)ptr) = value;
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
41 #define UART_BASE EP93XX_UART1_PHYS_BASE
44 #define PHYS_UART_DATA (UART_BASE + 0x00)
45 #define PHYS_UART_FLAG (UART_BASE + 0x18)
46 #define UART_FLAG_TXFF 0x20
48 static inline void putc(int c)
50 /* Transmit fifo not full? */
51 while (__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF)
54 __raw_writeb(c, PHYS_UART_DATA);
57 static inline void flush(void)
63 * Some bootloaders don't turn off DMA from the ethernet MAC before
64 * jumping to linux, which means that we might end up with bits of RX
65 * status and packet data scribbled over the uncompressed kernel image.
66 * Work around this by resetting the ethernet MAC before we uncompress.
68 #define PHYS_ETH_SELF_CTL 0x80010020
69 #define ETH_SELF_CTL_RESET 0x00000001
71 static void ethernet_reset(void)
75 /* Reset the ethernet MAC. */
76 v = __raw_readl(PHYS_ETH_SELF_CTL);
77 __raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL);
79 /* Wait for reset to finish. */
80 while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET)
85 static void arch_decomp_setup(void)