1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2013 Pengutronix 4 * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> 5 */ 6 7 #define UARTn_CMD 0x000c 8 #define UARTn_CMD_TXEN 0x0004 9 10 #define UARTn_STATUS 0x0010 11 #define UARTn_STATUS_TXC 0x0020 12 #define UARTn_STATUS_TXBL 0x0040 13 14 #define UARTn_TXDATA 0x0034 15 16 .macro addruart, rx, tmp, tmp2 17 ldr \rx, =(CONFIG_DEBUG_UART_PHYS) 18 19 /* 20 * enable TX. The driver might disable it to save energy. We 21 * don't care about disabling at the end as during debug power 22 * consumption isn't that important. 23 */ 24 ldr \tmp, =(UARTn_CMD_TXEN) 25 str \tmp, [\rx, #UARTn_CMD] 26 .endm 27 28 .macro senduart,rd,rx 29 strb \rd, [\rx, #UARTn_TXDATA] 30 .endm 31 32 .macro waituartcts,rd,rx 33 .endm 34 35 .macro waituarttxrdy,rd,rx 36 1001: ldr \rd, [\rx, #UARTn_STATUS] 37 tst \rd, #UARTn_STATUS_TXBL 38 beq 1001b 39 .endm 40 41 .macro busyuart,rd,rx 42 1001: ldr \rd, [\rx, UARTn_STATUS] 43 tst \rd, #UARTn_STATUS_TXC 44 bne 1001b 45 .endm 46