1 /* 2 * Copyright (c) 2019-2020, Socionext Inc. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 9 #include <drivers/console.h> 10 #include <errno.h> 11 #include <lib/mmio.h> 12 #include <plat/common/platform.h> 13 14 #include "uniphier.h" 15 #include "uniphier_console.h" 16 17 #define UNIPHIER_UART_OFFSET 0x100 18 #define UNIPHIER_UART_NR_PORTS 4 19 20 /* These callbacks are implemented in assembly to use crash_console_helpers.S */ 21 int uniphier_console_putc(int character, struct console *console); 22 int uniphier_console_getc(struct console *console); 23 void uniphier_console_flush(struct console *console); 24 25 static console_t uniphier_console = { 26 .flags = CONSOLE_FLAG_BOOT | 27 #if DEBUG 28 CONSOLE_FLAG_RUNTIME | 29 #endif 30 CONSOLE_FLAG_CRASH | 31 CONSOLE_FLAG_TRANSLATE_CRLF, 32 .putc = uniphier_console_putc, 33 #if ENABLE_CONSOLE_GETC 34 .getc = uniphier_console_getc, 35 #endif 36 .flush = uniphier_console_flush, 37 }; 38 39 static const uintptr_t uniphier_uart_base[] = { 40 [UNIPHIER_SOC_LD11] = 0x54006800, 41 [UNIPHIER_SOC_LD20] = 0x54006800, 42 [UNIPHIER_SOC_PXS3] = 0x54006800, 43 }; 44 45 /* 46 * There are 4 UART ports available on this platform. By default, we want to 47 * use the same one as used in the previous firmware stage. 48 */ 49 static uintptr_t uniphier_console_get_base(unsigned int soc) 50 { 51 uintptr_t base, end; 52 uint32_t div; 53 54 assert(soc < ARRAY_SIZE(uniphier_uart_base)); 55 base = uniphier_uart_base[soc]; 56 end = base + UNIPHIER_UART_OFFSET * UNIPHIER_UART_NR_PORTS; 57 58 while (base < end) { 59 div = mmio_read_32(base + UNIPHIER_UART_DLR); 60 if (div) 61 return base; 62 base += UNIPHIER_UART_OFFSET; 63 } 64 65 return 0; 66 } 67 68 static void uniphier_console_init(uintptr_t base) 69 { 70 mmio_write_32(base + UNIPHIER_UART_FCR, UNIPHIER_UART_FCR_ENABLE_FIFO); 71 mmio_write_32(base + UNIPHIER_UART_LCR_MCR, 72 UNIPHIER_UART_LCR_WLEN8 << 8); 73 } 74 75 void uniphier_console_setup(unsigned int soc) 76 { 77 uintptr_t base; 78 79 base = uniphier_console_get_base(soc); 80 if (!base) 81 plat_error_handler(-EINVAL); 82 83 uniphier_console.base = base; 84 console_register(&uniphier_console); 85 86 /* 87 * The hardware might be still printing characters queued up in the 88 * previous firmware stage. Make sure the transmitter is empty before 89 * any initialization. Otherwise, the console might get corrupted. 90 */ 91 console_flush(); 92 93 uniphier_console_init(base); 94 } 95