| Igor Sarkisov | a4dd30f | 2020-10-06 21:21:59 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * arch/arm/plat-omap/include/mach/uncompress.h |
| 3 | * |
| 4 | * Serial port stubs for kernel decompress status messages |
| 5 | * |
| 6 | * Initially based on: |
| 7 | * linux-2.4.15-rmk1-dsplinux1.6/arch/arm/plat-omap/include/mach1510/uncompress.h |
| 8 | * Copyright (C) 2000 RidgeRun, Inc. |
| 9 | * Author: Greg Lonnon <glonnon@ridgerun.com> |
| 10 | * |
| 11 | * Rewritten by: |
| 12 | * Author: <source@mvista.com> |
| 13 | * 2004 (c) MontaVista Software, Inc. |
| 14 | * |
| 15 | * This file is licensed under the terms of the GNU General Public License |
| 16 | * version 2. This program is licensed "as is" without any warranty of any |
| 17 | * kind, whether express or implied. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/serial_reg.h> |
| 22 | |
| 23 | #include <asm/memory.h> |
| 24 | #include <asm/mach-types.h> |
| 25 | |
| 26 | #include "serial.h" |
| 27 | |
| 28 | #define MDR1_MODE_MASK 0x07 |
| 29 | |
| 30 | volatile u8 *uart_base; |
| 31 | int uart_shift; |
| 32 | |
| 33 | /* |
| 34 | * Store the DEBUG_LL uart number into memory. |
| 35 | * See also debug-macro.S, and serial.c for related code. |
| 36 | */ |
| 37 | static void set_omap_uart_info(unsigned char port) |
| 38 | { |
| 39 | /* |
| 40 | * Get address of some.bss variable and round it down |
| 41 | * a la CONFIG_AUTO_ZRELADDR. |
| 42 | */ |
| 43 | u32 ram_start = (u32)&uart_shift & 0xf8000000; |
| 44 | u32 *uart_info = (u32 *)(ram_start + OMAP_UART_INFO_OFS); |
| 45 | *uart_info = port; |
| 46 | } |
| 47 | |
| 48 | static void putc(int c) |
| 49 | { |
| 50 | if (!uart_base) |
| 51 | return; |
| 52 | |
| 53 | /* Check for UART 16x mode */ |
| 54 | if ((uart_base[UART_OMAP_MDR1 << uart_shift] & MDR1_MODE_MASK) != 0) |
| 55 | return; |
| 56 | |
| 57 | while (!(uart_base[UART_LSR << uart_shift] & UART_LSR_THRE)) |
| 58 | barrier(); |
| 59 | uart_base[UART_TX << uart_shift] = c; |
| 60 | } |
| 61 | |
| 62 | static inline void flush(void) |
| 63 | { |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * Macros to configure UART1 and debug UART |
| 68 | */ |
| 69 | #define _DEBUG_LL_ENTRY(mach, dbg_uart, dbg_shft, dbg_id) \ |
| 70 | if (machine_is_##mach()) { \ |
| 71 | uart_base = (volatile u8 *)(dbg_uart); \ |
| 72 | uart_shift = (dbg_shft); \ |
| 73 | port = (dbg_id); \ |
| 74 | set_omap_uart_info(port); \ |
| 75 | break; \ |
| 76 | } |
| 77 | |
| 78 | #define DEBUG_LL_OMAP7XX(p, mach) \ |
| 79 | _DEBUG_LL_ENTRY(mach, OMAP1_UART##p##_BASE, OMAP7XX_PORT_SHIFT, \ |
| 80 | OMAP1UART##p) |
| 81 | |
| 82 | #define DEBUG_LL_OMAP1(p, mach) \ |
| 83 | _DEBUG_LL_ENTRY(mach, OMAP1_UART##p##_BASE, OMAP_PORT_SHIFT, \ |
| 84 | OMAP1UART##p) |
| 85 | |
| 86 | static inline void arch_decomp_setup(void) |
| 87 | { |
| 88 | int port = 0; |
| 89 | |
| 90 | /* |
| 91 | * Initialize the port based on the machine ID from the bootloader. |
| 92 | * Note that we're using macros here instead of switch statement |
| 93 | * as machine_is functions are optimized out for the boards that |
| 94 | * are not selected. |
| 95 | */ |
| 96 | do { |
| 97 | /* omap7xx/8xx based boards using UART1 with shift 0 */ |
| 98 | DEBUG_LL_OMAP7XX(1, herald); |
| 99 | DEBUG_LL_OMAP7XX(1, omap_perseus2); |
| 100 | |
| 101 | /* omap15xx/16xx based boards using UART1 */ |
| 102 | DEBUG_LL_OMAP1(1, ams_delta); |
| 103 | DEBUG_LL_OMAP1(1, nokia770); |
| 104 | DEBUG_LL_OMAP1(1, omap_h2); |
| 105 | DEBUG_LL_OMAP1(1, omap_h3); |
| 106 | DEBUG_LL_OMAP1(1, omap_innovator); |
| 107 | DEBUG_LL_OMAP1(1, omap_osk); |
| 108 | DEBUG_LL_OMAP1(1, omap_palmte); |
| 109 | DEBUG_LL_OMAP1(1, omap_palmz71); |
| 110 | |
| 111 | /* omap15xx/16xx based boards using UART2 */ |
| 112 | DEBUG_LL_OMAP1(2, omap_palmtt); |
| 113 | |
| 114 | /* omap15xx/16xx based boards using UART3 */ |
| 115 | DEBUG_LL_OMAP1(3, sx1); |
| 116 | } while (0); |
| 117 | } |
