drivers/serial/serial_mpc5xxx.c

/*
 * (C) Copyright 2000 - 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 *
 * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
 * changes based on the file arch/ppc/mbxboot/m8260_tty.c from the
 * Linux/PPC sources (m8260_tty.c had no copyright info in it).
 *
 * Martin Krause, 8 Jun 2006
 * Added CONFIG_SERIAL_MULTI support
 */

/*
 * Minimal serial functions needed to use one of the PSC ports
 * as serial console interface.
 */

#include <common.h>
#include <mach/mpc5xxx.h>
#include <driver.h>
#include <init.h>
#include <console.h>
#include <xfuncs.h>
#include <reloc.h>
#include <mach/clocks.h>

static int __mpc5xxx_serial_setbaudrate(struct mpc5xxx_psc *psc, int baudrate)
{
	unsigned long baseclk;
	int div;

#if defined(CONFIG_MGT5100)
	baseclk = (CFG_MPC5XXX_CLKIN + 16) / 32;
#elif defined(CONFIG_MPC5200)
	baseclk = (get_ipb_clock() + 16) / 32;
#endif

	/* set up UART divisor */
	div = (baseclk + (baudrate/2)) / baudrate;
	psc->ctur = (div >> 8) & 0xFF;
	psc->ctlr =  div & 0xff;

	return 0;
}

static int mpc5xxx_serial_setbaudrate(struct console_device *cdev, int baudrate)
{
	struct device_d *dev = cdev->dev;
	struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev->map_base;

	__mpc5xxx_serial_setbaudrate(psc, baudrate);

	return 0;
}

static int __mpc5xxx_serial_init(struct mpc5xxx_psc *psc)
{
	/* reset PSC */
	psc->command = PSC_SEL_MODE_REG_1;

	/* select clock sources */
#if defined(CONFIG_MGT5100)
	psc->psc_clock_select = 0xdd00;
#elif defined(CONFIG_MPC5200)
	psc->psc_clock_select = 0;
#endif

	/* switch to UART mode */
	psc->sicr = 0;

	/* configure parity, bit length and so on */
#if defined(CONFIG_MGT5100)
	psc->mode = PSC_MODE_ERR | PSC_MODE_8_BITS | PSC_MODE_PARNONE;
#elif defined(CONFIG_MPC5200)
	psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
#endif
	psc->mode = PSC_MODE_ONE_STOP;

	/* disable all interrupts */
	psc->psc_imr = 0;

	/* reset and enable Rx/Tx */
//	psc->command = PSC_RST_RX;
//	psc->command = PSC_RST_TX;
	psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;

	return 0;
}

static int mpc5xxx_serial_init(struct console_device *cdev)
{
	struct device_d *dev = cdev->dev;
	struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev->map_base;

	__mpc5xxx_serial_init(psc);

	return 0;
}

static void mpc5xxx_serial_putc (struct console_device *cdev, const char c)
{
	struct device_d *dev = cdev->dev;
	struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev->map_base;

	/* Wait for last character to go. */
	while (!(psc->psc_status & PSC_SR_TXEMP))
		;

	psc->psc_buffer_8 = c;
}

static int mpc5xxx_serial_getc (struct console_device *cdev)
{
	struct device_d *dev = cdev->dev;
	struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev->map_base;

	/* Wait for a character to arrive. */
	while (!(psc->psc_status & PSC_SR_RXRDY))
		;

	return psc->psc_buffer_8;
}

static int mpc5xxx_serial_tstc (struct console_device *cdev)
{
	struct device_d *dev = cdev->dev;
	struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev->map_base;

	return (psc->psc_status & PSC_SR_RXRDY);
}

static int mpc5xxx_serial_probe(struct device_d *dev)
{
	struct console_device *cdev;
	
	cdev = xzalloc(sizeof(struct console_device));
	dev->type_data = cdev;
	cdev->dev = dev;
	cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
	cdev->tstc = mpc5xxx_serial_tstc;
	cdev->putc = mpc5xxx_serial_putc;
	cdev->getc = mpc5xxx_serial_getc;
	cdev->setbrg = mpc5xxx_serial_setbaudrate;

	mpc5xxx_serial_init(cdev);

	console_register(cdev);

	return 0;
}

static struct driver_d mpc5xxx_serial_driver = {
        .name  = "mpc5xxx_serial",
        .probe = mpc5xxx_serial_probe,
};

static int mpc5xxx_serial_register(void)
{
	register_driver(&mpc5xxx_serial_driver);
	return 0;
}

console_initcall(mpc5xxx_serial_register);

#ifdef CONFIG_MPC5XXX_EARLY_CONSOLE

void early_console_putc(void *base, char c)
{
	struct mpc5xxx_psc *psc =
		(struct mpc5xxx_psc *)base;

	/* Wait for last character to go. */
	while (!(psc->psc_status & PSC_SR_TXEMP))
		;

	psc->psc_buffer_8 = c;
}

void early_console_init(void *base, int baudrate)
{
	struct mpc5xxx_psc *psc =
		(struct mpc5xxx_psc *)base;
	__mpc5xxx_serial_init(psc);
	__mpc5xxx_serial_setbaudrate(psc, baudrate);
}

#endif