| Santosh Shilimkar | 828989a | 2013-06-10 11:27:13 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Early serial debug output macro for Keystone SOCs |
| 3 | * |
| 4 | * Copyright 2013 Texas Instruments, Inc. |
| 5 | * Santosh Shilimkar <santosh.shilimkar@ti.com> |
| 6 | * |
| 7 | * Based on RMKs low level debug code. |
| 8 | * Copyright (C) 1994-1999 Russell King |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/serial_reg.h> |
| 16 | |
| 17 | #define UART_SHIFT 2 |
| 18 | #if defined(CONFIG_DEBUG_KEYSTONE_UART0) |
| 19 | #define UART_PHYS 0x02530c00 |
| 20 | #define UART_VIRT 0xfeb30c00 |
| 21 | #elif defined(CONFIG_DEBUG_KEYSTONE_UART1) |
| 22 | #define UART_PHYS 0x02531000 |
| 23 | #define UART_VIRT 0xfeb31000 |
| 24 | #endif |
| 25 | |
| 26 | .macro addruart, rp, rv, tmp |
| 27 | ldr \rv, =UART_VIRT @ physical base address |
| 28 | ldr \rp, =UART_PHYS @ virtual base address |
| 29 | .endm |
| 30 | |
| 31 | .macro senduart,rd,rx |
| 32 | str \rd, [\rx, #UART_TX << UART_SHIFT] |
| 33 | .endm |
| 34 | |
| 35 | .macro busyuart,rd,rx |
| 36 | 1002: ldr \rd, [\rx, #UART_LSR << UART_SHIFT] |
| 37 | and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE |
| 38 | teq \rd, #UART_LSR_TEMT | UART_LSR_THRE |
| 39 | bne 1002b |
| 40 | .endm |
| 41 | |
| 42 | .macro waituart,rd,rx |
| 43 | .endm |