ip2main.c

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/*
*
*   (c) 1999 by Computone Corporation
*
********************************************************************************
*
*   PACKAGE:     Linux tty Device Driver for IntelliPort family of multiport
*                serial I/O controllers.
*
*   DESCRIPTION: Mainline code for the device driver
*
*******************************************************************************/
// ToDo:
//
// Fix the immediate DSS_NOW problem.
// Work over the channel stats return logic in ip2_ipl_ioctl so they
//	make sense for all 256 possible channels and so the user space
//	utilities will compile and work properly.
//
// Done:
//
// 1.2.14	/\/\|=mhw=|\/\/
// Added bounds checking to ip2_ipl_ioctl to avoid potential terroristic acts.
// Changed the definition of ip2trace to be more consistent with kernel style
//	Thanks to Andreas Dilger <[e-mail]> for these updates
//
// 1.2.13	/\/\|=mhw=|\/\/
// DEVFS: Renamed ttf/{n} to tts/F{n} and cuf/{n} to cua/F{n} to conform
//	to agreed devfs serial device naming convention.
//
// 1.2.12	/\/\|=mhw=|\/\/
// Cleaned up some remove queue cut and paste errors
//
// 1.2.11	/\/\|=mhw=|\/\/
// Clean up potential NULL pointer dereferences
// Clean up devfs registration
// Add kernel command line parsing for io and irq
//	Compile defaults for io and irq are now set in ip2.c not ip2.h!
// Reworked poll_only hack for explicit parameter setting
//	You must now EXPLICITLY set poll_only = 1 or set all irqs to 0
// Merged ip2_loadmain and old_ip2_init
// Converted all instances of interruptible_sleep_on into queue calls
//	Most of these had no race conditions but better to clean up now
//
// 1.2.10	/\/\|=mhw=|\/\/
// Fixed the bottom half interrupt handler and enabled USE_IQI
//	to split the interrupt handler into a formal top-half / bottom-half
// Fixed timing window on high speed processors that queued messages to
// 	the outbound mail fifo faster than the board could handle.
//
// 1.2.9
// Four box EX was barfing on >128k kmalloc, made structure smaller by
// reducing output buffer size
//
// 1.2.8
// Device file system support (MHW)
//
// 1.2.7 
// Fixed
// Reload of ip2 without unloading ip2main hangs system on cat of /proc/modules
//
// 1.2.6
//Fixes DCD problems
//	DCD was not reported when CLOCAL was set on call to TIOCMGET
//
//Enhancements:
//	TIOCMGET requests and waits for status return
//	No DSS interrupts enabled except for DCD when needed
//
// For internal use only
//
//#define IP2DEBUG_INIT
//#define IP2DEBUG_OPEN
//#define IP2DEBUG_WRITE
//#define IP2DEBUG_READ
//#define IP2DEBUG_IOCTL
//#define IP2DEBUG_IPL

//#define IP2DEBUG_TRACE
//#define DEBUG_FIFO

/************/
/* Includes */
/************/
#include <linux/config.h>

#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/major.h>
#include <linux/wait.h>
#include <linux/device.h>

#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/termios.h>
#include <linux/tty_driver.h>
#include <linux/serial.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>

#include <linux/cdk.h>
#include <linux/comstats.h>
#include <linux/delay.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <linux/vmalloc.h>
#include <linux/init.h>

#include <asm/uaccess.h>

#include "ip2types.h"
#include "ip2trace.h"
#include "ip2ioctl.h"
#include "ip2.h"
#include "i2ellis.h"
#include "i2lib.h"

/*****************
 * /proc/ip2mem  *
 *****************/

#include <linux/proc_fs.h>

static int ip2_read_procmem(char *, char **, off_t, int);
static int ip2_read_proc(char *, char **, off_t, int, int *, void * );

/********************/
/* Type Definitions */
/********************/

/*************/
/* Constants */
/*************/

/* String constants to identify ourselves */
static char *pcName    = "Computone IntelliPort Plus multiport driver";
static char *pcVersion = "1.2.14";

/* String constants for port names */
static char *pcDriver_name   = "ip2";
static char *pcIpl    		 = "ip2ipl";

/* Serial subtype definitions */
#define SERIAL_TYPE_NORMAL    1

// cheezy kludge or genius - you decide?
int ip2_loadmain(int *, int *, unsigned char *, int);
static unsigned char *Fip_firmware;
static int Fip_firmware_size;

/***********************/
/* Function Prototypes */
/***********************/

/* Global module entry functions */

/* Private (static) functions */
static int  ip2_open(PTTY, struct file *);
static void ip2_close(PTTY, struct file *);
static int  ip2_write(PTTY, const unsigned char *, int);
static void ip2_putchar(PTTY, unsigned char);
static void ip2_flush_chars(PTTY);
static int  ip2_write_room(PTTY);
static int  ip2_chars_in_buf(PTTY);
static void ip2_flush_buffer(PTTY);
static int  ip2_ioctl(PTTY, struct file *, UINT, ULONG);
static void ip2_set_termios(PTTY, struct termios *);
static void ip2_set_line_discipline(PTTY);
static void ip2_throttle(PTTY);
static void ip2_unthrottle(PTTY);
static void ip2_stop(PTTY);
static void ip2_start(PTTY);
static void ip2_hangup(PTTY);
static int  ip2_tiocmget(struct tty_struct *tty, struct file *file);
static int  ip2_tiocmset(struct tty_struct *tty, struct file *file,
			 unsigned int set, unsigned int clear);

static void set_irq(int, int);
static void ip2_interrupt_bh(i2eBordStrPtr pB);
static irqreturn_t ip2_interrupt(int irq, void *dev_id, struct pt_regs * regs);
static void ip2_poll(unsigned long arg);
static inline void service_all_boards(void);
static void do_input(void *p);
static void do_status(void *p);

static void ip2_wait_until_sent(PTTY,int);

static void set_params (i2ChanStrPtr, struct termios *);
static int get_serial_info(i2ChanStrPtr, struct serial_struct __user *);
static int set_serial_info(i2ChanStrPtr, struct serial_struct __user *);

static ssize_t ip2_ipl_read(struct file *, char __user *, size_t, loff_t *);
static ssize_t ip2_ipl_write(struct file *, const char __user *, size_t, loff_t *);
static int ip2_ipl_ioctl(struct inode *, struct file *, UINT, ULONG);
static int ip2_ipl_open(struct inode *, struct file *);

static int DumpTraceBuffer(char __user *, int);
static int DumpFifoBuffer( char __user *, int);

static void ip2_init_board(int);
static unsigned short find_eisa_board(int);

/***************/
/* Static Data */
/***************/

static struct tty_driver *ip2_tty_driver;

/* Here, then is a table of board pointers which the interrupt routine should
 * scan through to determine who it must service.
 */
static unsigned short i2nBoards; // Number of boards here

static i2eBordStrPtr i2BoardPtrTable[IP2_MAX_BOARDS];

static i2ChanStrPtr  DevTable[IP2_MAX_PORTS];
//DevTableMem just used to save addresses for kfree
static void  *DevTableMem[IP2_MAX_BOARDS];

/* This is the driver descriptor for the ip2ipl device, which is used to
 * download the loadware to the boards.
 */
static struct file_operations ip2_ipl = {
	.owner		= THIS_MODULE,
	.read		= ip2_ipl_read,
	.write		= ip2_ipl_write,
	.ioctl		= ip2_ipl_ioctl,
	.open		= ip2_ipl_open,
}; 

static unsigned long irq_counter = 0;
static unsigned long bh_counter = 0;

// Use immediate queue to service interrupts
#define USE_IQI
//#define USE_IQ	// PCI&2.2 needs work

/* The timer_list entry for our poll routine. If interrupt operation is not
 * selected, the board is serviced periodically to see if anything needs doing.
 */
#define  POLL_TIMEOUT   (jiffies + 1)
static DEFINE_TIMER(PollTimer, ip2_poll, 0, 0);
static char  TimerOn;

#ifdef IP2DEBUG_TRACE
/* Trace (debug) buffer data */
#define TRACEMAX  1000
static unsigned long tracebuf[TRACEMAX];
static int tracestuff;
static int tracestrip;
static int tracewrap;
#endif

/**********/
/* Macros */
/**********/

#if defined(MODULE) && defined(IP2DEBUG_OPEN)
#define DBG_CNT(s) printk(KERN_DEBUG "(%s): [%x] refc=%d, ttyc=%d, modc=%x -> %s\n", \
		    tty->name,(pCh->flags),ip2_tty_driver->refcount, \
		    tty->count,/*GET_USE_COUNT(module)*/0,s)
#else
#define DBG_CNT(s)
#endif

/********/
/* Code */
/********/

#include "i2ellis.c"    /* Extremely low-level interface services */
#include "i2cmd.c"      /* Standard loadware command definitions */
#include "i2lib.c"      /* High level interface services */

/* Configuration area for modprobe */

MODULE_AUTHOR("Doug McNash");
MODULE_DESCRIPTION("Computone IntelliPort Plus Driver");

static int poll_only = 0;

static int Eisa_irq;
static int Eisa_slot;

static int iindx;
static char rirqs[IP2_MAX_BOARDS];
static int Valid_Irqs[] = { 3, 4, 5, 7, 10, 11, 12, 15, 0};

/* for sysfs class support */
static struct class *ip2_class;

// Some functions to keep track of what irq's we have

static int __init
is_valid_irq(int irq)
{
	int *i = Valid_Irqs;
	
	while ((*i != 0) && (*i != irq)) {
		i++;
	}
	return (*i);
}

static void __init
mark_requested_irq( char irq )
{
	rirqs[iindx++] = irq;
}

#ifdef MODULE
static int __init
clear_requested_irq( char irq )
{
	int i;
	for ( i = 0; i < IP2_MAX_BOARDS; ++i ) {
		if (rirqs[i] == irq) {
			rirqs[i] = 0;
			return 1;
		}
	}
	return 0;
}
#endif

static int __init
have_requested_irq( char irq )
{
	// array init to zeros so 0 irq will not be requested as a side effect
	int i;
	for ( i = 0; i < IP2_MAX_BOARDS; ++i ) {
		if (rirqs[i] == irq)
			return 1;
	}
	return 0;
}

/******************************************************************************/
/* Function:   init_module()                                                  */
/* Parameters: None                                                           */
/* Returns:    Success (0)                                                    */
/*                                                                            */
/* Description:                                                               */
/* This is a required entry point for an installable module. It simply calls  */
/* the driver initialisation function and returns what it returns.            */
/******************************************************************************/
#ifdef MODULE
int
init_module(void)
{
#ifdef IP2DEBUG_INIT
	printk (KERN_DEBUG "Loading module ...\n" );
#endif
    return 0;
}
#endif /* MODULE */

/******************************************************************************/
/* Function:   cleanup_module()                                               */
/* Parameters: None                                                           */
/* Returns:    Nothing                                                        */
/*                                                                            */
/* Description:                                                               */
/* This is a required entry point for an installable module. It has to return */
/* the device and the driver to a passive state. It should not be necessary   */
/* to reset the board fully, especially as the loadware is downloaded         */
/* externally rather than in the driver. We just want to disable the board    */
/* and clear the loadware to a reset state. To allow this there has to be a   */
/* way to detect whether the board has the loadware running at init time to   */
/* handle subsequent installations of the driver. All memory allocated by the */
/* driver should be returned since it may be unloaded from memory.            */
/******************************************************************************/
#ifdef MODULE
void
cleanup_module(void)