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|
/* drivers/char/ser_a2232.c */
/* $Id: ser_a2232.c,v 0.4 2000/01/25 12:00:00 ehaase Exp $ */
/* Linux serial driver for the Amiga A2232 board */
/* This driver is MAINTAINED. Before applying any changes, please contact
* the author.
*/
/* Copyright (c) 2000-2001 Enver Haase <ehaase@inf.fu-berlin.de>
* alias The A2232 driver project <A2232@gmx.net>
* All rights reserved.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/***************************** Documentation ************************/
/*
* This driver is in EXPERIMENTAL state. That means I could not find
* someone with five A2232 boards with 35 ports running at 19200 bps
* at the same time and test the machine's behaviour.
* However, I know that you can performance-tweak this driver (see
* the source code).
* One thing to consider is the time this driver consumes during the
* Amiga's vertical blank interrupt. Everything that is to be done
* _IS DONE_ when entering the vertical blank interrupt handler of
* this driver.
* However, it would be more sane to only do the job for only ONE card
* instead of ALL cards at a time; or, more generally, to handle only
* SOME ports instead of ALL ports at a time.
* However, as long as no-one runs into problems I guess I shouldn't
* change the driver as it runs fine for me :) .
*
* Version history of this file:
* 0.4 Resolved licensing issues.
* 0.3 Inclusion in the Linux/m68k tree, small fixes.
* 0.2 Added documentation, minor typo fixes.
* 0.1 Initial release.
*
* TO DO:
* - Handle incoming BREAK events. I guess "Stevens: Advanced
* Programming in the UNIX(R) Environment" is a good reference
* on what is to be done.
* - When installing as a module, don't simply 'printk' text, but
* send it to the TTY used by the user.
*
* THANKS TO:
* - Jukka Marin (65EC02 code).
* - The other NetBSD developers on whose A2232 driver I had a
* pretty close look. However, I didn't copy any code so it
* is okay to put my code under the GPL and include it into
* Linux.
*/
/***************************** End of Documentation *****************/
/***************************** Defines ******************************/
/*
* Enables experimental 115200 (normal) 230400 (turbo) baud rate.
* The A2232 specification states it can only operate at speeds up to
* 19200 bits per second, and I was not able to send a file via
* "sz"/"rz" and a null-modem cable from one A2232 port to another
* at 115200 bits per second.
* However, this might work for you.
*/
#undef A2232_SPEEDHACK
/*
* Default is not to use RTS/CTS so you could be talked to death.
*/
#define A2232_SUPPRESS_RTSCTS_WARNING
/************************* End of Defines ***************************/
/***************************** Includes *****************************/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <asm/setup.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <linux/zorro.h>
#include <asm/irq.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/serial.h>
#include <linux/generic_serial.h>
#include <linux/tty_flip.h>
#include "ser_a2232.h"
#include "ser_a2232fw.h"
/************************* End of Includes **************************/
/***************************** Prototypes ***************************/
/* The interrupt service routine */
static irqreturn_t a2232_vbl_inter(int irq, void *data);
/* Initialize the port structures */
static void a2232_init_portstructs(void);
/* Initialize and register TTY drivers. */
/* returns 0 IFF successful */
static int a2232_init_drivers(void);
/* BEGIN GENERIC_SERIAL PROTOTYPES */
static void a2232_disable_tx_interrupts(void *ptr);
static void a2232_enable_tx_interrupts(void *ptr);
static void a2232_disable_rx_interrupts(void *ptr);
static void a2232_enable_rx_interrupts(void *ptr);
static int a2232_carrier_raised(struct tty_port *port);
static void a2232_shutdown_port(void *ptr);
static int a2232_set_real_termios(void *ptr);
static int a2232_chars_in_buffer(void *ptr);
static void a2232_close(void *ptr);
static void a2232_hungup(void *ptr);
/* static void a2232_getserial (void *ptr, struct serial_struct *sp); */
/* END GENERIC_SERIAL PROTOTYPES */
/* Functions that the TTY driver struct expects */
static int a2232_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg);
static void a2232_throttle(struct tty_struct *tty);
static void a2232_unthrottle(struct tty_struct *tty);
static int a2232_open(struct tty_struct * tty, struct file * filp);
/************************* End of Prototypes ************************/
/***************************** Global variables *********************/
/*---------------------------------------------------------------------------
* Interface from generic_serial.c back here
*--------------------------------------------------------------------------*/
static struct real_driver a2232_real_driver = {
a2232_disable_tx_interrupts,
a2232_enable_tx_interrupts,
a2232_disable_rx_interrupts,
a2232_enable_rx_interrupts,
a2232_shutdown_port,
a2232_set_real_termios,
a2232_chars_in_buffer,
a2232_close,
a2232_hungup,
NULL /* a2232_getserial */
};
static void *a2232_driver_ID = &a2232_driver_ID; // Some memory address WE own.
/* Ports structs */
static struct a2232_port a2232_ports[MAX_A2232_BOARDS*NUMLINES];
/* TTY driver structs */
static struct tty_driver *a2232_driver;
/* nr of cards completely (all ports) and correctly configured */
static int nr_a2232;
/* zorro_dev structs for the A2232's */
static struct zorro_dev *zd_a2232[MAX_A2232_BOARDS];
/***************************** End of Global variables **************/
/* Helper functions */
static inline volatile struct a2232memory *a2232mem(unsigned int board)
{
return (volatile struct a2232memory *)ZTWO_VADDR(zd_a2232[board]->resource.start);
}
static inline volatile struct a2232status *a2232stat(unsigned int board,
unsigned int portonboard)
{
volatile struct a2232memory *mem = a2232mem(board);
return &(mem->Status[portonboard]);
}
static inline void a2232_receive_char(struct a2232_port *port, int ch, int err)
{
/* Mostly stolen from other drivers.
Maybe one could implement a more efficient version by not only
transferring one character at a time.
*/
struct tty_struct *tty = port->gs.port.tty;
#if 0
switch(err) {
case TTY_BREAK:
break;
case TTY_PARITY:
break;
case TTY_OVERRUN:
break;
case TTY_FRAME:
break;
}
#endif
tty_insert_flip_char(tty, ch, err);
tty_flip_buffer_push(tty);
}
/***************************** Functions ****************************/
/*** BEGIN OF REAL_DRIVER FUNCTIONS ***/
static void a2232_disable_tx_interrupts(void *ptr)
{
struct a2232_port *port;
volatile struct a2232status *stat;
unsigned long flags;
port = ptr;
stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
stat->OutDisable = -1;
/* Does this here really have to be? */
local_irq_save(flags);
port->gs.port.flags &= ~GS_TX_INTEN;
local_irq_restore(flags);
}
static void a2232_enable_tx_interrupts(void *ptr)
{
struct a2232_port *port;
volatile struct a2232status *stat;
unsigned long flags;
port = ptr;
stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
stat->OutDisable = 0;
/* Does this here really have to be? */
local_irq_save(flags);
port->gs.port.flags |= GS_TX_INTEN;
local_irq_restore(flags);
}
static void
|