/*
* Driver for NEC VR4100 series Serial Interface Unit.
*
* Copyright (C) 2004-2008 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.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
*/
#if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/console.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.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_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
static struct uart_port siu_uart_ports[SIU_PORTS_MAX] = {
[0 ... SIU_PORTS_MAX-1] = {
.lock = __SPIN_LOCK_UNLOCKED(siu_uart_ports->lock),
.irq = -1,
},
};
#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
static uint8_t lsr_break_flag[SIU_PORTS_MAX];
#endif
#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(port, UART_FCR, 0);
}
static inline unsigned long siu_port_size(struct uart_port *port)
{
switch (port->type) {
case PORT_VR41XX_SIU:
return 11UL;
case PORT_VR41XX_DSIU:
return 8UL;
}
return 0;
}
static inline unsigned int siu_check_type(struct uart_port *port)
{
if (port->line == 0)
return PORT_VR41XX_SIU;
if (port->line == 1 && port->irq != -1)
return PORT_VR41XX_DSIU;
return PORT_UNKNOWN;
}
static inline const char *siu_type_name(struct uart_port *port)
{
switch (port->type) {
case PORT_VR41XX_SIU:
return "SIU";
case PORT_VR41XX_DSIU:
return "DSIU";
}
return NULL;
}
static unsigned int siu_tx_empty(str