u-boot/drivers/serial/serial_sa1100.c

/*
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <azu@sysgo.de>
 *
 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <SA-1100.h>
#include <serial.h>
#include <linux/compiler.h>

DECLARE_GLOBAL_DATA_PTR;

static void sa1100_serial_setbrg(void)
{
	unsigned int reg = 0;

	if (gd->baudrate == 1200)
		reg = 191;
	else if (gd->baudrate == 9600)
		reg = 23;
	else if (gd->baudrate == 19200)
		reg = 11;
	else if (gd->baudrate == 38400)
		reg = 5;
	else if (gd->baudrate == 57600)
		reg = 3;
	else if (gd->baudrate == 115200)
		reg = 1;
	else
		hang ();

#ifdef CONFIG_SERIAL1
	/* SA1110 uart function */
	Ser1SDCR0 |= SDCR0_SUS;

	/* Wait until port is ready ... */
	while(Ser1UTSR1 & UTSR1_TBY) {}

	/* init serial serial 1 */
	Ser1UTCR3 = 0x00;
	Ser1UTSR0 = 0xff;
	Ser1UTCR0 = ( UTCR0_1StpBit | UTCR0_8BitData );
	Ser1UTCR1 = 0;
	Ser1UTCR2 = (u32)reg;
	Ser1UTCR3 = ( UTCR3_RXE | UTCR3_TXE );
#elif defined(CONFIG_SERIAL3)
	/* Wait until port is ready ... */
	while (Ser3UTSR1 & UTSR1_TBY) {
	}

	/* init serial serial 3 */
	Ser3UTCR3 = 0x00;
	Ser3UTSR0 = 0xff;
	Ser3UTCR0 = (UTCR0_1StpBit | UTCR0_8BitData);
	Ser3UTCR1 = 0;
	Ser3UTCR2 = (u32) reg;
	Ser3UTCR3 = (UTCR3_RXE | UTCR3_TXE);
#else
#error "Bad: you didn't configured serial ..."
#endif
}


/*
 * 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 sa1100_serial_init(void)
{
	serial_setbrg ();

	return (0);
}


/*
 * Output a single byte to the serial port.
 */
static void sa1100_serial_putc(const char c)
{
#ifdef CONFIG_SERIAL1
	/* wait for room in the tx FIFO on SERIAL1 */
	while ((Ser1UTSR0 & UTSR0_TFS) == 0);

	Ser1UTDR = c;
#elif defined(CONFIG_SERIAL3)
	/* wait for room in the tx FIFO on SERIAL3 */
	while ((Ser3UTSR0 & UTSR0_TFS) == 0);

	Ser3UTDR = c;
#endif

	/* If \n, also do \r */
	if (c == '\n')
		serial_putc ('\r');
}

/*
 * 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 sa1100_serial_tstc(void)
{
#ifdef CONFIG_SERIAL1
	return Ser1UTSR1 & UTSR1_RNE;
#elif defined(CONFIG_SERIAL3)
	return Ser3UTSR1 & UTSR1_RNE;
#endif
}

/*
 * 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 sa1100_serial_getc(void)
{
#ifdef CONFIG_SERIAL1
	while (!(Ser1UTSR1 & UTSR1_RNE));

	return (char) Ser1UTDR & 0xff;
#elif defined(CONFIG_SERIAL3)
	while (!(Ser3UTSR1 & UTSR1_RNE));

	return (char) Ser3UTDR & 0xff;
#endif
}

static struct serial_device sa1100_serial_drv = {
	.name	= "sa1100_serial",
	.start	= sa1100_serial_init,
	.stop	= NULL,
	.setbrg	= sa1100_serial_setbrg,
	.putc	= sa1100_serial_putc,
	.puts	= default_serial_puts,
	.getc	= sa1100_serial_getc,
	.tstc	= sa1100_serial_tstc,
};

void sa1100_serial_initialize(void)
{
	serial_register(&sa1100_serial_drv);
}

__weak struct serial_device *default_serial_console(void)
{
	return &sa1100_serial_drv;
}