path: root/drivers/serial/vr41xx_siu.c

/*
 *  Driver for NEC VR4100 series Serial Interface Unit.
 *
 *  Copyright (C) 2004-2005  Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
 *
 *  Based on drivers/serial/8250.c, by Russell King.
 *
 *  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 <linux/config.h>

#if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif

#include <linux/console.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>

#include <asm/io.h>
#include <asm/vr41xx/siu.h>
#include <asm/vr41xx/vr41xx.h>

#define SIU_PORTS_MAX	2
#define SIU_BAUD_BASE	1152000
#define SIU_MAJOR	204
#define SIU_MINOR_BASE	82

#define RX_MAX_COUNT	256
#define TX_MAX_COUNT	15

#define SIUIRSEL	0x08
 #define TMICMODE	0x20
 #define TMICTX		0x10
 #define IRMSEL		0x0c
 #define IRMSEL_HP	0x08
 #define IRMSEL_TEMIC	0x04
 #define IRMSEL_SHARP	0x00
 #define IRUSESEL	0x02
 #define SIRSEL		0x01

struct siu_port {
	unsigned int type;
	unsigned int irq;
	unsigned long start;
};

static const struct siu_port siu_type1_ports[] = {
	{	.type		= PORT_VR41XX_SIU,
		.irq		= SIU_IRQ,
		.start		= 0x0c000000UL,		},
};

#define SIU_TYPE1_NR_PORTS	(sizeof(siu_type1_ports) / sizeof(struct siu_port))

static const struct siu_port siu_type2_ports[] = {
	{	.type		= PORT_VR41XX_SIU,
		.irq		= SIU_IRQ,
		.start		= 0x0f000800UL,		},
	{	.type		= PORT_VR41XX_DSIU,
		.irq		= DSIU_IRQ,
		.start		= 0x0f000820UL,		},
};

#define SIU_TYPE2_NR_PORTS	(sizeof(siu_type2_ports) / sizeof(struct siu_port))

static struct uart_port siu_uart_ports[SIU_PORTS_MAX];
static uint8_t lsr_break_flag[SIU_PORTS_MAX];

#define siu_read(port, offset)		readb((port)->membase + (offset))
#define siu_write(port, offset, value)	writeb((value), (port)->membase + (offset))

void vr41xx_select_siu_interface(siu_interface_t interface)
{
	struct uart_port *port;
	unsigned long flags;
	uint8_t irsel;

	port = &siu_uart_ports[0];

	spin_lock_irqsave(&port->lock, flags);

	irsel = siu_read(port, SIUIRSEL);
	if (interface == SIU_INTERFACE_IRDA)
		irsel |= SIRSEL;
	else
		irsel &= ~SIRSEL;
	siu_write(port, SIUIRSEL, irsel);

	spin_unlock_irqrestore(&port->lock, flags);
}

EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);

void vr41xx_use_irda(irda_use_t use)
{
	struct uart_port *port;
	unsigned long flags;
	uint8_t irsel;

	port = &siu_uart_ports[0];

	spin_lock_irqsave(&port->lock, flags);

	irsel = siu_read(port, SIUIRSEL);
	if (use == FIR_USE_IRDA)
		irsel |= IRUSESEL;
	else
		irsel &= ~IRUSESEL;
	siu_write(port, SIUIRSEL, irsel);

	spin_unlock_irqrestore(&port->lock, flags);
}

EXPORT_SYMBOL_GPL(vr41xx_use_irda);

void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
{
	struct uart_port *port;
	unsigned long flags;
	uint8_t irsel;

	port = &siu_uart_ports[0];

	spin_lock_irqsave(&port->lock, flags);

	irsel = siu_read(port, SIUIRSEL);
	irsel &= ~(IRMSEL | TMICTX | TMICMODE);
	switch (module) {
	case SHARP_IRDA:
		irsel |= IRMSEL_SHARP;
		break;
	case TEMIC_IRDA:
		irsel |= IRMSEL_TEMIC | TMICMODE;
		if (speed == IRDA_TX_4MBPS)
			irsel |= TMICTX;
		break;
	case HP_IRDA:
		irsel |= IRMSEL_HP;
		break;
	default:
		break;
	}
	siu_write(port, SIUIRSEL, irsel);

	spin_unlock_irqrestore(&port->lock, flags);
}

EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);

static inline void siu_clear_fifo(struct uart_port *port)
{
	siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
	siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
	                          UART_FCR_CLEAR_XMIT);
	siu_write(