u-boot/drivers/serial/serial_lh7a40x.c
Marek Vasut 1f673b4f8b serial: arm: Implement CONFIG_SERIAL_MULTI into lh7a40x serial driver
Implement support for CONFIG_SERIAL_MULTI into lh7a40x 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 lh7a40x 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>
2012-10-15 11:53:56 -07:00

236 lines
4.7 KiB
C

/*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
*
* 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.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <common.h>
#include <lh7a40x.h>
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_CONSOLE_UART1)
# define UART_CONSOLE 1
#elif defined(CONFIG_CONSOLE_UART2)
# define UART_CONSOLE 2
#elif defined(CONFIG_CONSOLE_UART3)
# define UART_CONSOLE 3
#else
# error "No console configured ... "
#endif
static void lh7a40x_serial_setbrg(void)
{
lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
int i;
unsigned int reg = 0;
/*
* userguide 15.1.2.4
*
* BAUDDIV is (UART_REF_FREQ/(16 X BAUD))-1
*
* UART_REF_FREQ = external system clock input / 2 (Hz)
* BAUD is desired baudrate (bits/s)
*
* NOTE: we add (divisor/2) to numerator to round for
* more precision
*/
reg = (((get_PLLCLK()/2) + ((16*gd->baudrate)/2)) / (16 * gd->baudrate)) - 1;
uart->brcon = reg;
for (i = 0; i < 100; i++);
}
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*
*/
static int lh7a40x_serial_init(void)
{
lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
/* UART must be enabled before writing to any config registers */
uart->con |= (UART_EN);
#ifdef CONFIG_CONSOLE_UART1
/* infrared disabled */
uart->con |= UART_SIRD;
#endif
/* loopback disabled */
uart->con &= ~(UART_LBE);
/* modem lines and tx/rx polarities */
uart->con &= ~(UART_MXP | UART_TXP | UART_RXP);
/* FIFO enable, N81 */
uart->fcon = (UART_WLEN_8 | UART_FEN | UART_STP2_1);
/* set baudrate */
serial_setbrg ();
/* enable rx interrupt */
uart->inten |= UART_RI;
return (0);
}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
static int lh7a40x_serial_getc(void)
{
lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
/* wait for character to arrive */
while (uart->status & UART_RXFE);
return(uart->data & 0xff);
}
#ifdef CONFIG_HWFLOW
static int hwflow = 0; /* turned off by default */
int hwflow_onoff(int on)
{
switch(on) {
case 0:
default:
break; /* return current */
case 1:
hwflow = 1; /* turn on */
break;
case -1:
hwflow = 0; /* turn off */
break;
}
return hwflow;
}
#endif
#ifdef CONFIG_MODEM_SUPPORT
static int be_quiet = 0;
void disable_putc(void)
{
be_quiet = 1;
}
void enable_putc(void)
{
be_quiet = 0;
}
#endif
/*
* Output a single byte to the serial port.
*/
static void lh7a40x_serial_putc(const char c)
{
lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
#ifdef CONFIG_MODEM_SUPPORT
if (be_quiet)
return;
#endif
/* wait for room in the tx FIFO */
while (!(uart->status & UART_TXFE));
#ifdef CONFIG_HWFLOW
/* Wait for CTS up */
while(hwflow && !(uart->status & UART_CTS));
#endif
uart->data = c;
/* If \n, also do \r */
if (c == '\n')
serial_putc ('\r');
}
/*
* Test whether a character is in the RX buffer
*/
static int lh7a40x_serial_tstc(void)
{
lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
return(!(uart->status & UART_RXFE));
}
static void lh7a40x_serial_puts(const char *s)
{
while (*s) {
serial_putc (*s++);
}
}
#ifdef CONFIG_SERIAL_MULTI
static struct serial_device lh7a40x_serial_drv = {
.name = "lh7a40x_serial",
.start = lh7a40x_serial_init,
.stop = NULL,
.setbrg = lh7a40x_serial_setbrg,
.putc = lh7a40x_serial_putc,
.puts = lh7a40x_serial_puts,
.getc = lh7a40x_serial_getc,
.tstc = lh7a40x_serial_tstc,
};
void lh7a40x_serial_initialize(void)
{
serial_register(&lh7a40x_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &lh7a40x_serial_drv;
}
#else
int serial_init(void)
{
return lh7a40x_serial_init();
}
void serial_setbrg(void)
{
lh7a40x_serial_setbrg();
}
void serial_putc(const char c)
{
lh7a40x_serial_putc(c);
}
void serial_puts(const char *s)
{
lh7a40x_serial_puts(s);
}
int serial_getc(void)
{
return lh7a40x_serial_getc();
}
int serial_tstc(void)
{
return lh7a40x_serial_tstc();
}
#endif