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abaef69fbe
Implement support for CONFIG_SERIAL_MULTI into MCF serial driver. This driver was so far only usable directly, but this patch also adds support for the multi method. This allows using more than one serial driver alongside the MCF driver. Also, add a weak implementation of default_serial_console() returning this driver. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Marek Vasut <marek.vasut@gmail.com> Cc: Tom Rini <trini@ti.com> Cc: TsiChung Liew <tsicliew@gmail.com>
184 lines
4 KiB
C
184 lines
4 KiB
C
/*
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* (C) Copyright 2004-2007 Freescale Semiconductor, Inc.
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* TsiChung Liew, Tsi-Chung.Liew@freescale.com.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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/*
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* Minimal serial functions needed to use one of the uart ports
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* as serial console interface.
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*/
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#include <common.h>
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#include <asm/immap.h>
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#include <asm/uart.h>
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DECLARE_GLOBAL_DATA_PTR;
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extern void uart_port_conf(int port);
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static int mcf_serial_init(void)
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{
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volatile uart_t *uart;
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u32 counter;
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uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
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uart_port_conf(CONFIG_SYS_UART_PORT);
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/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
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uart->ucr = UART_UCR_RESET_RX;
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uart->ucr = UART_UCR_RESET_TX;
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uart->ucr = UART_UCR_RESET_ERROR;
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uart->ucr = UART_UCR_RESET_MR;
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__asm__("nop");
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uart->uimr = 0;
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/* write to CSR: RX/TX baud rate from timers */
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uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK);
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uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE);
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uart->umr = UART_UMR_SB_STOP_BITS_1;
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/* Setting up BaudRate */
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counter = (u32) ((gd->bus_clk / 32) + (gd->baudrate / 2));
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counter = counter / gd->baudrate;
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/* write to CTUR: divide counter upper byte */
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uart->ubg1 = (u8) ((counter & 0xff00) >> 8);
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/* write to CTLR: divide counter lower byte */
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uart->ubg2 = (u8) (counter & 0x00ff);
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uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED);
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return (0);
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}
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static void mcf_serial_putc(const char c)
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{
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volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
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if (c == '\n')
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serial_putc('\r');
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/* Wait for last character to go. */
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while (!(uart->usr & UART_USR_TXRDY)) ;
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uart->utb = c;
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}
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static void mcf_serial_puts(const char *s)
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{
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while (*s) {
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serial_putc(*s++);
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}
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}
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static int mcf_serial_getc(void)
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{
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volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
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/* Wait for a character to arrive. */
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while (!(uart->usr & UART_USR_RXRDY)) ;
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return uart->urb;
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}
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static int mcf_serial_tstc(void)
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{
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volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
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return (uart->usr & UART_USR_RXRDY);
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}
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static void mcf_serial_setbrg(void)
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{
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volatile uart_t *uart = (volatile uart_t *)(CONFIG_SYS_UART_BASE);
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u32 counter;
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/* Setting up BaudRate */
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counter = (u32) ((gd->bus_clk / 32) + (gd->baudrate / 2));
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counter = counter / gd->baudrate;
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/* write to CTUR: divide counter upper byte */
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uart->ubg1 = ((counter & 0xff00) >> 8);
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/* write to CTLR: divide counter lower byte */
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uart->ubg2 = (counter & 0x00ff);
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uart->ucr = UART_UCR_RESET_RX;
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uart->ucr = UART_UCR_RESET_TX;
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uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED;
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}
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#ifdef CONFIG_SERIAL_MULTI
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static struct serial_device mcf_serial_drv = {
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.name = "mcf_serial",
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.start = mcf_serial_init,
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.stop = NULL,
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.setbrg = mcf_serial_setbrg,
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.putc = mcf_serial_putc,
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.puts = mcf_serial_puts,
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.getc = mcf_serial_getc,
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.tstc = mcf_serial_tstc,
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};
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void mcf_serial_initialize(void)
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{
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serial_register(&mcf_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &mcf_serial_drv;
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}
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#else
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int serial_init(void)
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{
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return mcf_serial_init();
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}
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void serial_setbrg(void)
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{
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mcf_serial_setbrg();
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}
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void serial_putc(const char c)
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{
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mcf_serial_putc(c);
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}
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void serial_puts(const char *s)
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{
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mcf_serial_puts(s);
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}
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int serial_getc(void)
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{
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return mcf_serial_getc();
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}
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int serial_tstc(void)
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{
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return mcf_serial_tstc();
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}
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#endif
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