diff options
Diffstat (limited to 'src/soc/broadcom/cygnus/ns16550.c')
| -rw-r--r-- | src/soc/broadcom/cygnus/ns16550.c | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/src/soc/broadcom/cygnus/ns16550.c b/src/soc/broadcom/cygnus/ns16550.c deleted file mode 100644 index 0223278b04..0000000000 --- a/src/soc/broadcom/cygnus/ns16550.c +++ /dev/null @@ -1,128 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2000 Rob Taylor, Flying Pig Systems. robt@flyingpig.com. - * Copyright (C) Broadcom Corporation - * Copyright (C) 2015 Google Inc. - * - * 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; either version 2 of the License, or - * (at your option) any later version. - * - * 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. - */ - -#include <arch/io.h> -#include <boot/coreboot_tables.h> -#include <console/uart.h> -#include <delay.h> -#include <soc/ns16550.h> - -#define SYS_NS16550_CLK 100000000 -#define SYS_NS16550_BAUDRATE 115200 -#define MODE_X_DIV 16 -#define SINGLE_CHAR_TIMEOUT (50 * 1000) - -static struct ns16550 * const regs = - (void *)CONFIG_CONSOLE_SERIAL_UART_ADDRESS; - -static int calc_divisor(void) -{ - /* Compute divisor value. Normally, we should simply return: - * ns16550_clk / MODE_X_DIV / baudrate - * but we need to round that value by adding 0.5. - * Rounding is especially important at high baud rates. - */ - int div = MODE_X_DIV * SYS_NS16550_BAUDRATE; - return (SYS_NS16550_CLK + div / 2) / div; -} - -static void ns16550_init(void) -{ - int baud_divisor = calc_divisor(); - - while (!(read32(®s->lsr) & UART_LSR_TEMT)) - ; - - write32(®s->ier, 0); - write32(®s->lcr, UART_LCR_BKSE | UART_LCR_8N1); - write32(®s->dll, 0); - write32(®s->dlm, 0); - write32(®s->lcr, UART_LCR_8N1); - write32(®s->mcr, UART_MCR_DTR | UART_MCR_RTS); - /* clear & enable FIFOs */ - write32(®s->fcr, UART_FCR_FIFO_EN | UART_FCR_RXSR | UART_FCR_TXSR); - write32(®s->lcr, UART_LCR_BKSE | UART_LCR_8N1); - write32(®s->dll, baud_divisor & 0xff); - write32(®s->dlm, (baud_divisor >> 8) & 0xff); - write32(®s->lcr, UART_LCR_8N1); -} - -static void ns16550_tx_byte(unsigned char data) -{ - while ((read32(®s->lsr) & UART_LSR_THRE) == 0) - ; - write32(®s->thr, data); -} - -static void ns16550_tx_flush(void) -{ - while (!(read32(®s->lsr) & UART_LSR_TEMT)) - ; -} - -static int ns16550_tst_byte(void) -{ - return (read32(®s->lsr) & UART_LSR_DR) != 0; -} - -static unsigned char ns16550_rx_byte(void) -{ - unsigned long int i = SINGLE_CHAR_TIMEOUT; - while (i && !ns16550_tst_byte()) { - udelay(1); - i--; - } - if (i) - return read32(®s->rbr); - else - return 0x0; -} - -void uart_init(int idx) -{ - ns16550_init(); -} - -void uart_tx_byte(int idx, unsigned char data) -{ - ns16550_tx_byte(data); -} - -void uart_tx_flush(int idx) -{ - ns16550_tx_flush(); -} - -unsigned char uart_rx_byte(int idx) -{ - return ns16550_rx_byte(); -} - -#ifndef __PRE_RAM__ -void uart_fill_lb(void *data) -{ - struct lb_serial serial; - serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED; - serial.baseaddr = (uintptr_t)regs; - serial.baud = get_uart_baudrate(); - serial.regwidth = 4; - lb_add_serial(&serial, data); - - lb_add_console(LB_TAG_CONSOLE_SERIAL8250MEM, data); -} -#endif |