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 #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 putc(int c)48static inline void putc(int c) 49 { 50 int i; 51 52 for (i = 0; i < 10000; 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 flush(void)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 ethernet_reset(void)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 arch_decomp_setup(void)89static void arch_decomp_setup(void) 90 { 91 ethernet_reset(); 92 } 93