| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Serial port stubs for kernel decompress status messages |
| 3 | * |
| 4 | * Initially based on: |
| 5 | * arch/arm/plat-omap/include/mach/uncompress.h |
| 6 | * |
| 7 | * Original copyrights follow. |
| 8 | * |
| 9 | * Copyright (C) 2000 RidgeRun, Inc. |
| 10 | * Author: Greg Lonnon <glonnon@ridgerun.com> |
| 11 | * |
| 12 | * Rewritten by: |
| 13 | * Author: <source@mvista.com> |
| 14 | * 2004 (c) MontaVista Software, Inc. |
| 15 | * |
| 16 | * This file is licensed under the terms of the GNU General Public License |
| 17 | * version 2. This program is licensed "as is" without any warranty of any |
| 18 | * kind, whether express or implied. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/serial_reg.h> |
| 23 | |
| 24 | #include <asm/mach-types.h> |
| 25 | |
| 26 | #include <mach/serial.h> |
| 27 | |
| 28 | #define IOMEM(x) ((void __force __iomem *)(x)) |
| 29 | |
| 30 | u32 *uart; |
| 31 | |
| 32 | /* PORT_16C550A, in polled non-fifo mode */ |
| 33 | static inline void putc(char c) |
| 34 | { |
| 35 | if (!uart) |
| 36 | return; |
| 37 | |
| 38 | while (!(uart[UART_LSR] & UART_LSR_THRE)) |
| 39 | barrier(); |
| 40 | uart[UART_TX] = c; |
| 41 | } |
| 42 | |
| 43 | static inline void flush(void) |
| 44 | { |
| 45 | if (!uart) |
| 46 | return; |
| 47 | |
| 48 | while (!(uart[UART_LSR] & UART_LSR_THRE)) |
| 49 | barrier(); |
| 50 | } |
| 51 | |
| 52 | static inline void set_uart_info(u32 phys) |
| 53 | { |
| 54 | uart = (u32 *)phys; |
| 55 | } |
| 56 | |
| 57 | #define _DEBUG_LL_ENTRY(machine, phys) \ |
| 58 | { \ |
| 59 | if (machine_is_##machine()) { \ |
| 60 | set_uart_info(phys); \ |
| 61 | break; \ |
| 62 | } \ |
| 63 | } |
| 64 | |
| 65 | #define DEBUG_LL_DAVINCI(machine, port) \ |
| 66 | _DEBUG_LL_ENTRY(machine, DAVINCI_UART##port##_BASE) |
| 67 | |
| 68 | #define DEBUG_LL_DA8XX(machine, port) \ |
| 69 | _DEBUG_LL_ENTRY(machine, DA8XX_UART##port##_BASE) |
| 70 | |
| 71 | static inline void __arch_decomp_setup(unsigned long arch_id) |
| 72 | { |
| 73 | /* |
| 74 | * Initialize the port based on the machine ID from the bootloader. |
| 75 | * Note that we're using macros here instead of switch statement |
| 76 | * as machine_is functions are optimized out for the boards that |
| 77 | * are not selected. |
| 78 | */ |
| 79 | do { |
| 80 | /* Davinci boards */ |
| 81 | DEBUG_LL_DAVINCI(davinci_evm, 0); |
| 82 | DEBUG_LL_DAVINCI(sffsdr, 0); |
| 83 | DEBUG_LL_DAVINCI(neuros_osd2, 0); |
| 84 | DEBUG_LL_DAVINCI(davinci_dm355_evm, 0); |
| 85 | DEBUG_LL_DAVINCI(dm355_leopard, 0); |
| 86 | DEBUG_LL_DAVINCI(davinci_dm6467_evm, 0); |
| 87 | DEBUG_LL_DAVINCI(davinci_dm365_evm, 0); |
| 88 | |
| 89 | /* DA8xx boards */ |
| 90 | DEBUG_LL_DA8XX(davinci_da830_evm, 2); |
| 91 | DEBUG_LL_DA8XX(davinci_da850_evm, 2); |
| 92 | DEBUG_LL_DA8XX(mityomapl138, 1); |
| 93 | DEBUG_LL_DA8XX(omapl138_hawkboard, 2); |
| 94 | } while (0); |
| 95 | } |
| 96 | |
| 97 | #define arch_decomp_setup() __arch_decomp_setup(arch_id) |