a73b93157f
It encourages users from writing to the FSF without giving an address. Linux also prefers to drop that and their checkpatch.pl (that we imported) looks out for that. This is the result of util/scripts/no-fsf-addresses.sh with no further editing. Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11888 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2000 Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
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* Copyright (C) Broadcom Corporation
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* Copyright (C) 2015 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <arch/io.h>
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#include <boot/coreboot_tables.h>
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#include <console/console.h> /* for __console definition */
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#include <console/uart.h>
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#include <delay.h>
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#include <soc/ns16550.h>
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#define SYS_NS16550_CLK 100000000
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#define SYS_NS16550_BAUDRATE 115200
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#define MODE_X_DIV 16
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#define SINGLE_CHAR_TIMEOUT (50 * 1000)
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static struct ns16550 * const regs =
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(void *)CONFIG_CONSOLE_SERIAL_UART_ADDRESS;
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static int calc_divisor(void)
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{
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/* Compute divisor value. Normally, we should simply return:
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* ns16550_clk / MODE_X_DIV / baudrate
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* but we need to round that value by adding 0.5.
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* Rounding is especially important at high baud rates.
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*/
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int div = MODE_X_DIV * SYS_NS16550_BAUDRATE;
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return (SYS_NS16550_CLK + div / 2) / div;
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}
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static void ns16550_init(void)
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{
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int baud_divisor = calc_divisor();
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while (!(read32(®s->lsr) & UART_LSR_TEMT))
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;
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write32(®s->ier, 0);
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write32(®s->lcr, UART_LCR_BKSE | UART_LCR_8N1);
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write32(®s->dll, 0);
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write32(®s->dlm, 0);
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write32(®s->lcr, UART_LCR_8N1);
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write32(®s->mcr, UART_MCR_DTR | UART_MCR_RTS);
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/* clear & enable FIFOs */
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write32(®s->fcr, UART_FCR_FIFO_EN | UART_FCR_RXSR | UART_FCR_TXSR);
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write32(®s->lcr, UART_LCR_BKSE | UART_LCR_8N1);
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write32(®s->dll, baud_divisor & 0xff);
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write32(®s->dlm, (baud_divisor >> 8) & 0xff);
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write32(®s->lcr, UART_LCR_8N1);
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}
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static void ns16550_tx_byte(unsigned char data)
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{
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while ((read32(®s->lsr) & UART_LSR_THRE) == 0)
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;
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write32(®s->thr, data);
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}
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static void ns16550_tx_flush(void)
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{
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while (!(read32(®s->lsr) & UART_LSR_TEMT))
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;
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}
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static int ns16550_tst_byte(void)
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{
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return (read32(®s->lsr) & UART_LSR_DR) != 0;
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}
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static unsigned char ns16550_rx_byte(void)
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{
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unsigned long int i = SINGLE_CHAR_TIMEOUT;
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while (i-- && !ns16550_tst_byte())
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udelay(1);
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if (i)
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return read32(®s->rbr);
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else
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return 0x0;
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}
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void uart_init(int idx)
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{
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ns16550_init();
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}
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void uart_tx_byte(int idx, unsigned char data)
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{
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ns16550_tx_byte(data);
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}
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void uart_tx_flush(int idx)
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{
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ns16550_tx_flush();
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}
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unsigned char uart_rx_byte(int idx)
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{
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return ns16550_rx_byte();
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}
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#ifndef __PRE_RAM__
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void uart_fill_lb(void *data)
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{
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struct lb_serial serial;
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serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
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serial.baseaddr = (uintptr_t)regs;
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serial.baud = default_baudrate();
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serial.regwidth = 1;
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lb_add_serial(&serial, data);
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lb_add_console(LB_TAG_CONSOLE_SERIAL8250MEM, data);
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}
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#endif
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