diff options
Diffstat (limited to 'src/lib/uart8250mem.c')
-rw-r--r-- | src/lib/uart8250mem.c | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/src/lib/uart8250mem.c b/src/lib/uart8250mem.c deleted file mode 100644 index ce45de9c10..0000000000 --- a/src/lib/uart8250mem.c +++ /dev/null @@ -1,133 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2003 Eric Biederman - * Copyright (C) 2006-2010 coresystems GmbH - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include <arch/io.h> -#include <console/uart.h> -#include <uart8250.h> -#include <device/device.h> -#include <delay.h> - -/* Should support 8250, 16450, 16550, 16550A type UARTs */ - -/* Expected character delay at 1200bps is 9ms for a working UART - * and no flow-control. Assume UART as stuck if shift register - * or FIFO takes more than 50ms per character to appear empty. - */ -#define SINGLE_CHAR_TIMEOUT (50 * 1000) -#define FIFO_TIMEOUT (16 * SINGLE_CHAR_TIMEOUT) - -static int uart8250_mem_can_tx_byte(unsigned base_port) -{ - return read8(base_port + UART_LSR) & UART_LSR_THRE; -} - -static void uart8250_mem_tx_byte(unsigned base_port, unsigned char data) -{ - unsigned long int i = SINGLE_CHAR_TIMEOUT; - while(i-- && !uart8250_mem_can_tx_byte(base_port)) - udelay(1); - write8(base_port + UART_TBR, data); -} - -static void uart8250_mem_tx_flush(unsigned base_port) -{ - unsigned long int i = FIFO_TIMEOUT; - while(i-- && !(read8(base_port + UART_LSR) & UART_LSR_TEMT)) - udelay(1); -} - -static int uart8250_mem_can_rx_byte(unsigned base_port) -{ - return read8(base_port + UART_LSR) & UART_LSR_DR; -} - -static unsigned char uart8250_mem_rx_byte(unsigned base_port) -{ - unsigned long int i = SINGLE_CHAR_TIMEOUT; - while(i-- && !uart8250_mem_can_rx_byte(base_port)) - udelay(1); - if (i) - return read8(base_port + UART_RBR); - else - return 0x0; -} - -static void uart8250_mem_init(unsigned base_port, unsigned divisor) -{ - /* Disable interrupts */ - write8(base_port + UART_IER, 0x0); - /* Enable FIFOs */ - write8(base_port + UART_FCR, UART_FCR_FIFO_EN); - - /* Assert DTR and RTS so the other end is happy */ - write8(base_port + UART_MCR, UART_MCR_DTR | UART_MCR_RTS); - - /* DLAB on */ - write8(base_port + UART_LCR, UART_LCR_DLAB | CONFIG_TTYS0_LCS); - - write8(base_port + UART_DLL, divisor & 0xFF); - write8(base_port + UART_DLM, (divisor >> 8) & 0xFF); - - /* Set to 3 for 8N1 */ - write8(base_port + UART_LCR, CONFIG_TTYS0_LCS); -} - -void uart_init(void) -{ - u32 base = uart_platform_base(0); - if (!base) - return; - - unsigned int div; - div = uart_baudrate_divisor(default_baudrate(), uart_platform_refclk(), 16); - uart8250_mem_init(base, div); -} - -void uart_tx_byte(unsigned char data) -{ - u32 base = uart_platform_base(0); - if (!base) - return; - uart8250_mem_tx_byte(base, data); -} - -unsigned char uart_rx_byte(void) -{ - u32 base = uart_platform_base(0); - if (!base) - return 0xff; - return uart8250_mem_rx_byte(base); -} - -int uart_can_rx_byte(void) -{ - u32 base = uart_platform_base(0); - if (!base) - return 0; - return uart8250_mem_can_rx_byte(base); -} - -void uart_tx_flush(void) -{ - u32 base = uart_platform_base(0); - if (!base) - return; - uart8250_mem_tx_flush(base); -} |