1/* 2 * Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6#include <arch.h> 7#include <asm_macros.S> 8#include <assert_macros.S> 9#include <console_macros.S> 10#include <pl011.h> 11 12/* 13 * Pull in generic functions to provide backwards compatibility for 14 * platform makefiles 15 */ 16#include "../../../console/aarch32/console.S" 17 18 /* 19 * "core" functions are low-level implementations that don't require 20 * writeable memory and are thus safe to call in BL1 crash context. 21 */ 22 .globl console_pl011_core_init 23 .globl console_pl011_core_putc 24 .globl console_pl011_core_getc 25 .globl console_pl011_core_flush 26 27 .globl console_pl011_putc 28 .globl console_pl011_getc 29 .globl console_pl011_flush 30 31 32 /* ----------------------------------------------- 33 * int console_core_init(uintptr_t base_addr, 34 * unsigned int uart_clk, unsigned int baud_rate) 35 * Function to initialize the console without a 36 * C Runtime to print debug information. This 37 * function will be accessed by console_init and 38 * crash reporting. 39 * In: r0 - console base address 40 * r1 - Uart clock in Hz 41 * r2 - Baud rate 42 * Out: return 1 on success else 0 on error 43 * Clobber list : r1, r2, r3 44 * ----------------------------------------------- 45 */ 46func console_pl011_core_init 47 /* Check the input base address */ 48 cmp r0, #0 49 beq core_init_fail 50#if !PL011_GENERIC_UART 51 /* Check baud rate and uart clock for sanity */ 52 cmp r1, #0 53 beq core_init_fail 54 cmp r2, #0 55 beq core_init_fail 56 /* Disable the UART before initialization */ 57 ldr r3, [r0, #UARTCR] 58 bic r3, r3, #PL011_UARTCR_UARTEN 59 str r3, [r0, #UARTCR] 60 /* Program the baudrate */ 61 /* Divisor = (Uart clock * 4) / baudrate */ 62 lsl r1, r1, #2 63 udiv r2, r1, r2 64 /* IBRD = Divisor >> 6 */ 65 lsr r1, r2, #6 66 /* Write the IBRD */ 67 str r1, [r0, #UARTIBRD] 68 /* FBRD = Divisor & 0x3F */ 69 and r1, r2, #0x3f 70 /* Write the FBRD */ 71 str r1, [r0, #UARTFBRD] 72 mov r1, #PL011_LINE_CONTROL 73 str r1, [r0, #UARTLCR_H] 74 /* Clear any pending errors */ 75 mov r1, #0 76 str r1, [r0, #UARTECR] 77 /* Enable tx, rx, and uart overall */ 78 ldr r1, =(PL011_UARTCR_RXE | PL011_UARTCR_TXE | PL011_UARTCR_UARTEN) 79 str r1, [r0, #UARTCR] 80#endif 81 mov r0, #1 82 bx lr 83core_init_fail: 84 mov r0, #0 85 bx lr 86endfunc console_pl011_core_init 87 88#if MULTI_CONSOLE_API 89 .globl console_pl011_register 90 91 /* ------------------------------------------------------- 92 * init console_pl011_register(console_pl011_t *console, 93 * uintptr_t base, uint32_t clk, uint32_t baud) 94 * Function to initialize and register a new PL011 95 * console. Storage passed in for the console struct 96 * *must* be persistent (i.e. not from the stack). 97 * In: r0 - UART register base address 98 * r1 - UART clock in Hz 99 * r2 - Baud rate 100 * r3 - pointer to empty console_pl011_t struct 101 * Out: return 1 on success, 0 on error 102 * Clobber list : r0, r1, r2 103 * ------------------------------------------------------- 104 */ 105func console_pl011_register 106 push {r4, lr} 107 mov r4, r3 108 cmp r4, #0 109 beq register_fail 110 str r0, [r4, #CONSOLE_T_PL011_BASE] 111 112 bl console_pl011_core_init 113 cmp r0, #0 114 beq register_fail 115 116 mov r0, r4 117 pop {r4, lr} 118 finish_console_register pl011 119 120register_fail: 121 pop {r4, pc} 122endfunc console_pl011_register 123#else 124 .globl console_core_init 125 .globl console_core_putc 126 .globl console_core_getc 127 .globl console_core_flush 128 .equ console_core_init, console_pl011_core_init 129 .equ console_core_putc, console_pl011_core_putc 130 .equ console_core_getc, console_pl011_core_getc 131 .equ console_core_flush, console_pl011_core_flush 132#endif 133 134 /* -------------------------------------------------------- 135 * int console_core_putc(int c, uintptr_t base_addr) 136 * Function to output a character over the console. It 137 * returns the character printed on success or -1 on error. 138 * In : r0 - character to be printed 139 * r1 - console base address 140 * Out : return -1 on error else return character. 141 * Clobber list : r2 142 * -------------------------------------------------------- 143 */ 144func console_pl011_core_putc 145 /* Check the input parameter */ 146 cmp r1, #0 147 beq putc_error 148 /* Prepend '\r' to '\n' */ 149 cmp r0, #0xA 150 bne 2f 1511: 152 /* Check if the transmit FIFO is full */ 153 ldr r2, [r1, #UARTFR] 154 tst r2, #PL011_UARTFR_TXFF 155 bne 1b 156 mov r2, #0xD 157 str r2, [r1, #UARTDR] 1582: 159 /* Check if the transmit FIFO is full */ 160 ldr r2, [r1, #UARTFR] 161 tst r2, #PL011_UARTFR_TXFF 162 bne 2b 163 str r0, [r1, #UARTDR] 164 bx lr 165putc_error: 166 mov r0, #-1 167 bx lr 168endfunc console_pl011_core_putc 169 170 /* -------------------------------------------------------- 171 * int console_pl011_putc(int c, console_pl011_t *console) 172 * Function to output a character over the console. It 173 * returns the character printed on success or -1 on error. 174 * In: r0 - character to be printed 175 * r1 - pointer to console_t structure 176 * Out : return -1 on error else return character. 177 * Clobber list: r2 178 * ------------------------------------------------------- 179 */ 180func console_pl011_putc 181#if ENABLE_ASSERTIONS 182 cmp r1, #0 183 ASM_ASSERT(ne) 184#endif /* ENABLE_ASSERTIONS */ 185 ldr r1, [r1, #CONSOLE_T_PL011_BASE] 186 b console_pl011_core_putc 187endfunc console_pl011_putc 188 189 /* --------------------------------------------- 190 * int console_core_getc(uintptr_t base_addr) 191 * Function to get a character from the console. 192 * It returns the character grabbed on success 193 * or -1 on error. 194 * In : r0 - console base address 195 * Clobber list : r0, r1 196 * --------------------------------------------- 197 */ 198func console_pl011_core_getc 199 cmp r0, #0 200 beq getc_error 2011: 202 /* Check if the receive FIFO is empty */ 203 ldr r1, [r0, #UARTFR] 204 tst r1, #PL011_UARTFR_RXFE 205 bne 1b 206 ldr r1, [r0, #UARTDR] 207 mov r0, r1 208 bx lr 209getc_error: 210 mov r0, #-1 211 bx lr 212endfunc console_pl011_core_getc 213 214 /* ------------------------------------------------ 215 * int console_pl011_getc(console_pl011_t *console) 216 * Function to get a character from the console. 217 * It returns the character grabbed on success 218 * or -1 if no character is available. 219 * In : r0 - pointer to console_t structure 220 * Out: r0 - character if available, else -1 221 * Clobber list: r0, r1 222 * ------------------------------------------------ 223 */ 224func console_pl011_getc 225#if ENABLE_ASSERTIONS 226 cmp r0, #0 227 ASM_ASSERT(ne) 228#endif /* ENABLE_ASSERTIONS */ 229 ldr r0, [r0, #CONSOLE_T_PL011_BASE] 230 b console_pl011_core_getc 231endfunc console_pl011_getc 232 233 /* --------------------------------------------- 234 * int console_core_flush(uintptr_t base_addr) 235 * Function to force a write of all buffered 236 * data that hasn't been output. 237 * In : r0 - console base address 238 * Out : return -1 on error else return 0. 239 * Clobber list : r0, r1 240 * --------------------------------------------- 241 */ 242func console_pl011_core_flush 243 cmp r0, #0 244 beq flush_error 245 2461: 247 /* Loop while the transmit FIFO is busy */ 248 ldr r1, [r0, #UARTFR] 249 tst r1, #PL011_UARTFR_BUSY 250 bne 1b 251 252 mov r0, #0 253 bx lr 254flush_error: 255 mov r0, #-1 256 bx lr 257endfunc console_pl011_core_flush 258 259 /* --------------------------------------------- 260 * int console_pl011_flush(console_pl011_t *console) 261 * Function to force a write of all buffered 262 * data that hasn't been output. 263 * In : r0 - pointer to console_t structure 264 * Out : return -1 on error else return 0. 265 * Clobber list: r0, r1 266 * --------------------------------------------- 267 */ 268func console_pl011_flush 269#if ENABLE_ASSERTIONS 270 cmp r0, #0 271 ASM_ASSERT(ne) 272#endif /* ENABLE_ASSERTIONS */ 273 ldr r0, [r0, #CONSOLE_T_PL011_BASE] 274 b console_pl011_core_flush 275endfunc console_pl011_flush 276