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 consistant 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/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>
// Uncomment the following if you want it compiled with modversions

#include <linux/version.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>
#ifdef	CONFIG_DEVFS_FS
#include <linux/devfs_fs_kernel.h>
#endif
#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/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 <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/bitops.h>

#ifndef KERNEL_VERSION
#define KERNEL_VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0)
#	include <linux/vmalloc.h>
#	include <linux/init.h>
#	include <asm/serial.h>
#else
#	include <linux/bios32.h>
#endif

// These VERSION switches maybe inexact because I simply don't know
// when the various features appeared in the 2.1.XX kernels.
// They are good enough for 2.0 vs 2.2 and if you are fooling with
// the 2.1.XX stuff then it would be trivial for you to fix.
// Most of these macros were stolen from some other drivers
// so blame them.

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,4)
#	include <asm/segment.h>
#	define GET_USER(error,value,addr) error = get_user(value,addr)
#	define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
#	define PUT_USER(error,value,addr) error = put_user(value,addr)
#	define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0

#	if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,5)
#		include <asm/uaccess.h>
#		define		pcibios_strerror(status)	\
					printk( KERN_ERR "IP2: PCI error 0x%x \n", status );
#	endif

#else  /* 2.0.x and 2.1.x before 2.1.4 */

#	define		proc_register_dynamic(a,b) proc_register(a,b) 

#	define GET_USER(error,value,addr)					  \
	do {									  \
		error = verify_area (VERIFY_READ, (void *) addr, sizeof (value)); \
		if (error == 0)							  \
			value = get_user(addr);					  \
	} while (0)

#	define COPY_FROM_USER(error,dest,src,size)				  \
	do {									  \
		error = verify_area (VERIFY_READ, (void *) src, size);		  \
		if (error == 0)							  \
			memcpy_fromfs (dest, src, size);			  \
	} while (0)

#	define PUT_USER(error,value,addr)					   \
	do {									   \
		error = verify_area (VERIFY_WRITE, (void *) addr, sizeof (value)); \
		if (error == 0)							   \
			put_user (value, addr);					   \
	} while (0)

#	define COPY_TO_USER(error,dest,src,size)				  \
	do {									  \
		error = verify_area (VERIFY_WRITE, (void *) dest, size);		  \
		if (error == 0)							  \
			memcpy_tofs (dest, src, size);				  \
	} while (0)

#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)
#define __init
#define __initfunc(a) a
#define __initdata
#define ioremap(a,b) vremap((a),(b))
#define iounmap(a) vfree((a))
#define SERIAL_TYPE_NORMAL	1
#define SERIAL_TYPE_CALLOUT	2
#define schedule_timeout(a){current->timeout = jiffies + (a); schedule();}
#define signal_pending(a) ((a)->signal & ~(a)->blocked)
#define in_interrupt()	intr_count
#endif

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

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

#include <linux/proc_fs.h>

static int ip2_read_procmem(char *, char **, off_t, int);
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";
#ifdef	CONFIG_DEVFS_FS
static char *pcTty    		 = "tts/F%d";
static char *pcCallout		 = "cua/F%d";
#else
static char *pcTty    		 = "ttyF";
static char *pcCallout		 = "cuf";
#endif
static char *pcIpl    		 = "ip2ipl";

/* Serial subtype definitions */
#define SERIAL_TYPE_NORMAL    1
#define SERIAL_TYPE_CALLOUT   2

// 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 */
#ifdef MODULE
int init_module(void);
void cleanup_module(void);
#endif

/* Private (static) functions */
static int  ip2_open(PTTY, struct file *);
static void ip2_close(PTTY, struct file *);
static int  ip2_write(PTTY, int, 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 void set_irq(int, int);
static void ip2_interrupt_bh(i2eBordStrPtr pB);
static void 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 inline void do_input(i2ChanStrPtr pCh);
static inline void do_status(i2ChanStrPtr pCh);

static void ip2_wait_until_sent(PTTY,int);

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

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)
static int     ip2_ipl_read(struct inode *, char *, size_t , loff_t *);
#else
static ssize_t ip2_ipl_read(struct file *, char *, size_t, loff_t *) ;
#endif
static ssize_t ip2_ipl_write(struct file *, const char *, 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 *, int);
static int DumpFifoBuffer( char *, int);

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

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

static struct tty_driver ip2_tty_driver;
static struct tty_driver ip2_callout_driver;

static int ref_count;

/* 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];

static struct tty_struct * TtyTable[IP2_MAX_PORTS];
static struct termios    * Termios[IP2_MAX_PORTS];
static struct termios    * TermiosLocked[IP2_MAX_PORTS];

/* 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 struct timer_list PollTimer = { function: ip2_poll };
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", \
		    kdevname(tty->device),(pCh->flags),ref_count, \
		    tty->count,/*GET_USE_COUNT(module)*/0,s)
#else
#define DBG_CNT(s)
#endif

#define MIN(a,b)	( ( (a) < (b) ) ? (a) : (b) )
#define MAX(a,b)	( ( (a) > (b) ) ? (a) : (b) )

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

#include "./ip2/i2ellis.c"    /* Extremely low-level interface services */
#include "./ip2/i2cmd.c"      /* Standard loadware command definitions */
#include "./ip2/i2lib.c"      /* High level interface services */

/* Configuration area for modprobe */
#ifdef MODULE
#	if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0)
		MODULE_AUTHOR("Doug McNash");
		MODULE_DESCRIPTION("Computone IntelliPort Plus Driver");
#	endif	/* LINUX_VERSION */
#endif	/* MODULE */

static int poll_only = 0;

static int Eisa_irq;