Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 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 | |
| 14 | static unsigned char __raw_readb(unsigned int ptr) |
| 15 | { |
| 16 | return *((volatile unsigned char *)ptr); |
| 17 | } |
| 18 | |
| 19 | static unsigned int __raw_readl(unsigned int ptr) |
| 20 | { |
| 21 | return *((volatile unsigned int *)ptr); |
| 22 | } |
| 23 | |
| 24 | static void __raw_writeb(unsigned char value, unsigned int ptr) |
| 25 | { |
| 26 | *((volatile unsigned char *)ptr) = value; |
| 27 | } |
| 28 | |
| 29 | static void __raw_writel(unsigned int value, unsigned int ptr) |
| 30 | { |
| 31 | *((volatile unsigned int *)ptr) = value; |
| 32 | } |
| 33 | |
Hartley Sweeten | 92e88aa | 2008-10-02 17:13:02 +0100 | [diff] [blame] | 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 |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 43 | |
Hartley Sweeten | 92e88aa | 2008-10-02 17:13:02 +0100 | [diff] [blame] | 44 | #define PHYS_UART_DATA (UART_BASE + 0x00) |
| 45 | #define PHYS_UART_FLAG (UART_BASE + 0x18) |
| 46 | #define UART_FLAG_TXFF 0x20 |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 47 | |
| 48 | static inline void putc(int c) |
| 49 | { |
| 50 | int i; |
| 51 | |
| 52 | for (i = 0; i < 1000; i++) { |
| 53 | /* Transmit fifo not full? */ |
Hartley Sweeten | 92e88aa | 2008-10-02 17:13:02 +0100 | [diff] [blame] | 54 | if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF)) |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 55 | break; |
| 56 | } |
| 57 | |
Hartley Sweeten | 92e88aa | 2008-10-02 17:13:02 +0100 | [diff] [blame] | 58 | __raw_writeb(c, PHYS_UART_DATA); |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | static 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 | |
| 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 | } |
| 93 | |
| 94 | #define arch_decomp_wdog() |