Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2003 Eric Biederman |
| 5 | * Copyright (C) 2006-2010 coresystems GmbH |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; version 2 of the License. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
Kyösti Mälkki | 4566d2e | 2014-04-23 10:28:59 +0300 | [diff] [blame] | 21 | #include <rules.h> |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 22 | #include <stdlib.h> |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 23 | #include <arch/io.h> |
Kyösti Mälkki | 1d7541f | 2014-02-17 21:34:42 +0200 | [diff] [blame] | 24 | #include <console/uart.h> |
Rudolf Marek | 7f0e930 | 2011-09-02 23:23:41 +0200 | [diff] [blame] | 25 | #include <trace.h> |
Kyösti Mälkki | bea6bf0 | 2014-01-30 15:45:16 +0200 | [diff] [blame] | 26 | #include "uart8250reg.h" |
Rudolf Marek | 7f0e930 | 2011-09-02 23:23:41 +0200 | [diff] [blame] | 27 | |
Kyösti Mälkki | bbf6f3d | 2014-03-15 01:32:55 +0200 | [diff] [blame] | 28 | #ifndef __ROMCC__ |
| 29 | #include <boot/coreboot_tables.h> |
| 30 | #endif |
| 31 | |
Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 32 | /* Should support 8250, 16450, 16550, 16550A type UARTs */ |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 33 | |
Kyösti Mälkki | 3ee1668 | 2014-02-17 19:37:52 +0200 | [diff] [blame] | 34 | /* Nominal values only, good for the range of choices Kconfig offers for |
| 35 | * set of standard baudrates. |
| 36 | */ |
| 37 | #define BAUDRATE_REFCLK (115200) |
| 38 | #define BAUDRATE_OVERSAMPLE (1) |
| 39 | |
Kyösti Mälkki | 9dd3ef1 | 2012-02-07 20:50:22 +0200 | [diff] [blame] | 40 | /* Expected character delay at 1200bps is 9ms for a working UART |
| 41 | * and no flow-control. Assume UART as stuck if shift register |
| 42 | * or FIFO takes more than 50ms per character to appear empty. |
| 43 | * |
| 44 | * Estimated that inb() from UART takes 1 microsecond. |
| 45 | */ |
| 46 | #define SINGLE_CHAR_TIMEOUT (50 * 1000) |
| 47 | #define FIFO_TIMEOUT (16 * SINGLE_CHAR_TIMEOUT) |
| 48 | |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 49 | static int uart8250_can_tx_byte(unsigned base_port) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 50 | { |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 51 | return inb(base_port + UART8250_LSR) & UART8250_LSR_THRE; |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 52 | } |
| 53 | |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 54 | static void uart8250_tx_byte(unsigned base_port, unsigned char data) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 55 | { |
Kyösti Mälkki | 9dd3ef1 | 2012-02-07 20:50:22 +0200 | [diff] [blame] | 56 | unsigned long int i = SINGLE_CHAR_TIMEOUT; |
| 57 | while (i-- && !uart8250_can_tx_byte(base_port)); |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 58 | outb(data, base_port + UART8250_TBR); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 59 | } |
| 60 | |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 61 | static void uart8250_tx_flush(unsigned base_port) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 62 | { |
Kyösti Mälkki | 9dd3ef1 | 2012-02-07 20:50:22 +0200 | [diff] [blame] | 63 | unsigned long int i = FIFO_TIMEOUT; |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 64 | while (i-- && !(inb(base_port + UART8250_LSR) & UART8250_LSR_TEMT)); |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 65 | } |
| 66 | |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 67 | static int uart8250_can_rx_byte(unsigned base_port) |
Greg Watson | e54d55b | 2004-03-13 03:40:51 +0000 | [diff] [blame] | 68 | { |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 69 | return inb(base_port + UART8250_LSR) & UART8250_LSR_DR; |
Greg Watson | e54d55b | 2004-03-13 03:40:51 +0000 | [diff] [blame] | 70 | } |
| 71 | |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 72 | static unsigned char uart8250_rx_byte(unsigned base_port) |
Greg Watson | e54d55b | 2004-03-13 03:40:51 +0000 | [diff] [blame] | 73 | { |
Kyösti Mälkki | 9dd3ef1 | 2012-02-07 20:50:22 +0200 | [diff] [blame] | 74 | unsigned long int i = SINGLE_CHAR_TIMEOUT; |
| 75 | while (i-- && !uart8250_can_rx_byte(base_port)); |
Patrick Georgi | 472efa6 | 2012-02-16 20:44:20 +0100 | [diff] [blame] | 76 | |
Kyösti Mälkki | 9dd3ef1 | 2012-02-07 20:50:22 +0200 | [diff] [blame] | 77 | if (i) |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 78 | return inb(base_port + UART8250_RBR); |
Kyösti Mälkki | 9dd3ef1 | 2012-02-07 20:50:22 +0200 | [diff] [blame] | 79 | else |
| 80 | return 0x0; |
Greg Watson | e54d55b | 2004-03-13 03:40:51 +0000 | [diff] [blame] | 81 | } |
| 82 | |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 83 | static void uart8250_init(unsigned base_port, unsigned divisor) |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 84 | { |
Rudolf Marek | 7f0e930 | 2011-09-02 23:23:41 +0200 | [diff] [blame] | 85 | DISABLE_TRACE; |
Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 86 | /* Disable interrupts */ |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 87 | outb(0x0, base_port + UART8250_IER); |
Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 88 | /* Enable FIFOs */ |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 89 | outb(UART8250_FCR_FIFO_EN, base_port + UART8250_FCR); |
Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 90 | |
Stefan Reinauer | ebafa4d | 2006-10-07 00:13:24 +0000 | [diff] [blame] | 91 | /* assert DTR and RTS so the other end is happy */ |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 92 | outb(UART8250_MCR_DTR | UART8250_MCR_RTS, base_port + UART8250_MCR); |
Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 93 | |
| 94 | /* DLAB on */ |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 95 | outb(UART8250_LCR_DLAB | CONFIG_TTYS0_LCS, base_port + UART8250_LCR); |
Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 96 | |
Kyösti Mälkki | 9dd3ef1 | 2012-02-07 20:50:22 +0200 | [diff] [blame] | 97 | /* Set Baud Rate Divisor. 12 ==> 9600 Baud */ |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 98 | outb(divisor & 0xFF, base_port + UART8250_DLL); |
| 99 | outb((divisor >> 8) & 0xFF, base_port + UART8250_DLM); |
Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 100 | |
| 101 | /* Set to 3 for 8N1 */ |
Gabe Black | 77ffa0d | 2013-09-30 21:25:49 -0700 | [diff] [blame] | 102 | outb(CONFIG_TTYS0_LCS, base_port + UART8250_LCR); |
Rudolf Marek | 7f0e930 | 2011-09-02 23:23:41 +0200 | [diff] [blame] | 103 | ENABLE_TRACE; |
Eric Biederman | 8ca8d76 | 2003-04-22 19:02:15 +0000 | [diff] [blame] | 104 | } |
Eric Biederman | 5cd8173 | 2004-03-11 15:01:31 +0000 | [diff] [blame] | 105 | |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 106 | static const unsigned bases[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 107 | |
Ronald G. Minnich | 2adb297 | 2014-10-16 10:53:48 +0000 | [diff] [blame] | 108 | uintptr_t uart_platform_base(int idx) |
Kyösti Mälkki | bbf6f3d | 2014-03-15 01:32:55 +0200 | [diff] [blame] | 109 | { |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 110 | if (idx < ARRAY_SIZE(bases)) |
| 111 | return bases[idx]; |
| 112 | return 0; |
Kyösti Mälkki | bbf6f3d | 2014-03-15 01:32:55 +0200 | [diff] [blame] | 113 | } |
| 114 | |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 115 | void uart_init(int idx) |
Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 116 | { |
Kyösti Mälkki | 3ee1668 | 2014-02-17 19:37:52 +0200 | [diff] [blame] | 117 | unsigned int div; |
| 118 | div = uart_baudrate_divisor(default_baudrate(), BAUDRATE_REFCLK, |
| 119 | BAUDRATE_OVERSAMPLE); |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 120 | uart8250_init(uart_platform_base(idx), div); |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 121 | } |
| 122 | |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 123 | void uart_tx_byte(int idx, unsigned char data) |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 124 | { |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 125 | uart8250_tx_byte(uart_platform_base(idx), data); |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 126 | } |
| 127 | |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 128 | unsigned char uart_rx_byte(int idx) |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 129 | { |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 130 | return uart8250_rx_byte(uart_platform_base(idx)); |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 131 | } |
| 132 | |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 133 | void uart_tx_flush(int idx) |
Kyösti Mälkki | 4770749 | 2014-02-15 07:53:18 +0200 | [diff] [blame] | 134 | { |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 135 | uart8250_tx_flush(uart_platform_base(idx)); |
Stefan Reinauer | 85b0fa1 | 2010-12-17 00:08:21 +0000 | [diff] [blame] | 136 | } |
Kyösti Mälkki | bbf6f3d | 2014-03-15 01:32:55 +0200 | [diff] [blame] | 137 | |
Kyösti Mälkki | 4566d2e | 2014-04-23 10:28:59 +0300 | [diff] [blame] | 138 | #if ENV_RAMSTAGE |
Kyösti Mälkki | bbf6f3d | 2014-03-15 01:32:55 +0200 | [diff] [blame] | 139 | void uart_fill_lb(void *data) |
| 140 | { |
| 141 | struct lb_serial serial; |
| 142 | serial.type = LB_SERIAL_TYPE_IO_MAPPED; |
Kyösti Mälkki | 70342a7 | 2014-03-14 22:28:29 +0200 | [diff] [blame] | 143 | serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE); |
Kyösti Mälkki | bbf6f3d | 2014-03-15 01:32:55 +0200 | [diff] [blame] | 144 | serial.baud = default_baudrate(); |
Vadim Bendebury | 9dccf1c | 2015-01-09 16:54:19 -0800 | [diff] [blame^] | 145 | serial.regwidth = 1; |
Kyösti Mälkki | bbf6f3d | 2014-03-15 01:32:55 +0200 | [diff] [blame] | 146 | lb_add_serial(&serial, data); |
| 147 | |
| 148 | lb_add_console(LB_TAG_CONSOLE_SERIAL8250, data); |
| 149 | } |
| 150 | #endif |