projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| e7736d47 | 1 | /* |
| a09e64fb | 2 | * arch/arm/mach-ep93xx/include/mach/uncompress.h |
| e7736d47 LB |
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 | ||
| a09e64fb | 12 | #include <mach/ep93xx-regs.h> |
| e7736d47 LB |
13 | |
| 14 | static unsigned char __raw_readb(unsigned int ptr) | |
| 15 | { | |
| 16 | return *((volatile unsigned char *)ptr); | |
| 17 | } | |
| 18 | ||
| c9b4470e LB |
19 | static unsigned int __raw_readl(unsigned int ptr) |
| 20 | { | |
| 21 | return *((volatile unsigned int *)ptr); | |
| 22 | } | |
| 23 | ||
| e7736d47 LB |
24 | static void __raw_writeb(unsigned char value, unsigned int ptr) |
| 25 | { | |
| 26 | *((volatile unsigned char *)ptr) = value; | |
| 27 | } | |
| 28 | ||
| c9b4470e LB |
29 | static void __raw_writel(unsigned int value, unsigned int ptr) |
| 30 | { | |
| 31 | *((volatile unsigned int *)ptr) = value; | |
| 32 | } | |
| 33 | ||
| 92e88aa7 HS |
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 | |
| e7736d47 | 47 | |
| a081568d | 48 | static inline void putc(int c) |
| e7736d47 | 49 | { |
| 605c357b HS |
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 | } | |
| e7736d47 | 57 | |
| 92e88aa7 | 58 | __raw_writeb(c, PHYS_UART_DATA); |
| e7736d47 LB |
59 | } |
| 60 | ||
| a081568d | 61 | static inline void flush(void) |
| e7736d47 | 62 | { |
| e7736d47 LB |
63 | } |
| 64 | ||
| c9b4470e LB |
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 | ||
| 75 | static 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 | ||
| 89 | static void arch_decomp_setup(void) | |
| 90 | { | |
| 91 | ethernet_reset(); | |
| 92 | } |