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 __raw_readb(unsigned int ptr)14static unsigned char __raw_readb(unsigned int ptr) 15 { 16 return *((volatile unsigned char *)ptr); 17 } 18 __raw_readl(unsigned int ptr)19static unsigned int __raw_readl(unsigned int ptr) 20 { 21 return *((volatile unsigned int *)ptr); 22 } 23 __raw_writeb(unsigned char value,unsigned int ptr)24static void __raw_writeb(unsigned char value, unsigned int ptr) 25 { 26 *((volatile unsigned char *)ptr) = value; 27 } 28 __raw_writel(unsigned int value,unsigned int ptr)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 putc(int c)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 flush(void)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 ethernet_reset(void)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 arch_decomp_setup(void)79static void arch_decomp_setup(void) 80 { 81 ethernet_reset(); 82 } 83