rio_linux.c

h内核

/* rio_linux.c -- Linux driver for the Specialix RIO series cards. 
 *
 *
 *   (C) 1999 [e-mail]
 *
 * Specialix pays for the development and support of this driver.
 * Please DO contact [e-mail] if you require
 * support. But please read the documentation (rio.txt) first.
 *
 *
 *
 *      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.
 *
 * Revision history:
 * $Log: rio.c,v $
 * Revision 1.1  1999/07/11 10:13:54  wolff
 * Initial revision
 *
 * */

#include <linux/module.h>
#include <linux/config.h> 
#include <linux/kdev_t.h>
#include <asm/io.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/mm.h>
#include <linux/serial.h>
#include <linux/fcntl.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/miscdevice.h>
#include <linux/init.h>

#include <linux/generic_serial.h>
#include <asm/uaccess.h>

#if BITS_PER_LONG != 32
#  error FIXME: this driver only works on 32-bit platforms
#endif

#include "linux_compat.h"
#include "typdef.h"
#include "pkt.h"
#include "daemon.h"
#include "rio.h"
#include "riospace.h"
#include "top.h"
#include "cmdpkt.h"
#include "map.h"
#include "riotypes.h"
#include "rup.h"
#include "port.h"
#include "riodrvr.h"
#include "rioinfo.h"
#include "func.h"
#include "errors.h"
#include "pci.h"

#include "parmmap.h"
#include "unixrup.h"
#include "board.h"
#include "host.h"
#include "error.h"
#include "phb.h"
#include "link.h"
#include "cmdblk.h"
#include "route.h"
#include "control.h"
#include "cirrus.h"
#include "rioioctl.h"
#include "param.h"
#include "list.h"
#include "sam.h"
#include "protsts.h"
#include "rioboard.h"


#include "rio_linux.h"

/* I don't think that this driver can handle more than 512 ports on
one machine.  Specialix specifies max 4 boards in one machine. I don't
know why. If you want to try anyway you'll have to increase the number
of boards in rio.h.  You'll have to allocate more majors if you need
more than 512 ports.... */

#ifndef RIO_NORMAL_MAJOR0
/* This allows overriding on the compiler commandline, or in a "major.h" 
   include or something like that */
#define RIO_NORMAL_MAJOR0  154
#define RIO_NORMAL_MAJOR1  156
#endif

#ifndef PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8
#define PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8 0x2000
#endif

#ifndef RIO_WINDOW_LEN 
#define RIO_WINDOW_LEN 0x10000
#endif


/* Configurable options: 
   (Don't be too sure that it'll work if you toggle them) */

/* Am I paranoid or not ? ;-) */
#undef RIO_PARANOIA_CHECK


/* 20 -> 2000 per second. The card should rate-limit interrupts at 1000
   Hz, but it is user configurable. I don't recommend going above 1000
   Hz. The interrupt ratelimit might trigger if the interrupt is
   shared with a very active other device. 
   undef this if you want to disable the check....
*/
#define IRQ_RATE_LIMIT 200

#if 0
/* Not implemented */
/* 
 * The following defines are mostly for testing purposes. But if you need
 * some nice reporting in your syslog, you can define them also.
 */
#define RIO_REPORT_FIFO
#define RIO_REPORT_OVERRUN
#endif 


/* These constants are derived from SCO Source */
static struct Conf
RIOConf =
{
  /* locator */         "RIO Config here",
  /* startuptime */     HZ*2,           /* how long to wait for card to run */
  /* slowcook */        0,              /* TRUE -> always use line disc. */
  /* intrpolltime */    1,              /* The frequency of OUR polls */
  /* breakinterval */   25,             /* x10 mS XXX: units seem to be 1ms not 10! -- REW*/
  /* timer */           10,             /* mS */
  /* RtaLoadBase */     0x7000,
  /* HostLoadBase */    0x7C00,
  /* XpHz */            5,              /* number of Xprint hits per second */
  /* XpCps */           120,            /* Xprint characters per second */
  /* XpOn */            "\033d#",       /* start Xprint for a wyse 60 */
  /* XpOff */           "\024",         /* end Xprint for a wyse 60 */
  /* MaxXpCps */        2000,           /* highest Xprint speed */
  /* MinXpCps */        10,             /* slowest Xprint speed */
  /* SpinCmds */        1,              /* non-zero for mega fast boots */
  /* First Addr */      0x0A0000,       /* First address to look at */
  /* Last Addr */       0xFF0000,       /* Last address looked at */
  /* BufferSize */      1024,           /* Bytes per port of buffering */
  /* LowWater */        256,            /* how much data left before wakeup */
  /* LineLength */      80,             /* how wide is the console? */
  /* CmdTimeout */      HZ,             /* how long a close command may take */
};




/* Function prototypes */

static void rio_disable_tx_interrupts (void * ptr); 
static void rio_enable_tx_interrupts (void * ptr); 
static void rio_disable_rx_interrupts (void * ptr); 
static void rio_enable_rx_interrupts (void * ptr); 
static int  rio_get_CD (void * ptr); 
static void rio_shutdown_port (void * ptr);
static int  rio_set_real_termios (void  *ptr);
static void rio_hungup (void  *ptr);
static void rio_close (void  *ptr);
static int rio_chars_in_buffer (void * ptr);
static int rio_fw_ioctl (struct inode *inode, struct file *filp,
		         unsigned int cmd, unsigned long arg);
static int rio_init_drivers(void);

static void my_hd (void *addr, int len);

static struct tty_driver *rio_driver, *rio_driver2;

/* The name "p" is a bit non-descript. But that's what the rio-lynxos
sources use all over the place. */
struct rio_info *p;

int rio_debug;


/* You can have the driver poll your card. 
    - Set rio_poll to 1 to poll every timer tick (10ms on Intel). 
      This is used when the card cannot use an interrupt for some reason.
*/
static int rio_poll = 1;


/* These are the only open spaces in my computer. Yours may have more
   or less.... */
static int rio_probe_addrs[]= {0xc0000, 0xd0000, 0xe0000};

#define NR_RIO_ADDRS (sizeof(rio_probe_addrs)/sizeof (int))


/* Set the mask to all-ones. This alas, only supports 32 interrupts. 
   Some architectures may need more. -- Changed to LONG to
   support up to 64 bits on 64bit architectures. -- REW 20/06/99 */
long rio_irqmask = -1;

MODULE_AUTHOR("Rogier Wolff <[e-mail]>, Patrick van de Lageweg <[e-mail]>");
MODULE_DESCRIPTION("RIO driver");
MODULE_LICENSE("GPL");
module_param(rio_poll, int, 0);
module_param(rio_debug, int, 0644);
module_param(rio_irqmask, long, 0);

static struct real_driver rio_real_driver = {
  rio_disable_tx_interrupts,
  rio_enable_tx_interrupts,
  rio_disable_rx_interrupts,
  rio_enable_rx_interrupts,
  rio_get_CD,
  rio_shutdown_port, 
  rio_set_real_termios, 
  rio_chars_in_buffer,
  rio_close,
  rio_hungup,
  NULL
};

/* 
 *  Firmware loader driver specific routines
 *
 */

static struct file_operations rio_fw_fops = {
	.owner		= THIS_MODULE,
	.ioctl		= rio_fw_ioctl,
};

static struct miscdevice rio_fw_device = {
	RIOCTL_MISC_MINOR, "rioctl", &rio_fw_fops
};





#ifdef RIO_PARANOIA_CHECK

/* This doesn't work. Who's paranoid around here? Not me! */

static inline int rio_paranoia_check(struct rio_port const * port,
				    char *name, const char *routine)
{

  static const char *badmagic =
    KERN_ERR "rio: Warning: bad rio port magic number for device %s in %s\n";
  static const char *badinfo =
    KERN_ERR "rio: Warning: null rio port for device %s in %s\n";
 
  if (!port) {
    printk (badinfo, name, routine);
    return 1;
  }
  if (port->magic != RIO_MAGIC) {
    printk (badmagic, name, routine);
    return 1;
  }

  return 0;
}
#else
#define rio_paranoia_check(a,b,c) 0
#endif


#ifdef DEBUG
static void my_hd (void *ad, int len)
{
  int i, j, ch;
  unsigned char *addr = ad;
  
  for (i=0;i<len;i+=16) {
    rio_dprintk (RIO_DEBUG_PARAM, "%08x ", (int) addr+i);
    for (j=0;j<16;j++) {
      rio_dprintk (RIO_DEBUG_PARAM, "%02x %s", addr[j+i], (j==7)?" ":"");
    }
    for (j=0;j<16;j++) {
      ch = addr[j+i];
      rio_dprintk (RIO_DEBUG_PARAM, "%c", (ch < 0x20)?'.':((ch > 0x7f)?'.':ch));
    }
    rio_dprintk (RIO_DEBUG_PARAM, "\n");
  }
}
#else
#define my_hd(ad,len) do{/* nothing*/ } while (0)
#endif


/* Delay a number of jiffies, allowing a signal to interrupt */ 
int RIODelay (struct Port *PortP, int njiffies)
{
  func_enter ();

  rio_dprintk (RIO_DEBUG_DELAY, "delaying %d jiffies\n", njiffies);  
  msleep_interruptible(jiffies_to_msecs(njiffies));
  func_exit();

  if (signal_pending(current))
    return RIO_FAIL;
  else
    return !RIO_FAIL;
}


/* Delay a number of jiffies, disallowing a signal to interrupt */ 
int RIODelay_ni (struct Port *PortP, int njiffies)
{
  func_enter ();

  rio_dprintk (RIO_DEBUG_DELAY, "delaying %d jiffies (ni)\n", njiffies);  
  msleep(jiffies_to_msecs(njiffies));
  func_exit();
  return !RIO_FAIL;
}


int rio_minor(struct tty_struct *tty)
{
	return tty->index + (tty->driver == rio_driver) ? 0 : 256;
}


int rio_ismodem(struct tty_struct *tty)
{
	return 1;
}


void rio_udelay (int usecs)
{
  udelay (usecs);
}

static int rio_set_real_termios (void *ptr)
{
  int rv, modem;
  struct tty_struct *tty;
  func_enter();

  tty = ((struct Port *)ptr)->gs.tty;

  modem = rio_ismodem(tty);

  rv = RIOParam( (struct Port *) ptr, CONFIG, modem, 1);

  func_exit ();

  return rv;
}


static void rio_reset_interrupt (struct Host *HostP)
{
  func_enter();

  switch( HostP->Type ) {
  case RIO_AT:
  case RIO_MCA:
  case RIO_PCI:
    WBYTE(HostP->ResetInt , 0xff);
  }

  func_exit();
}


static irqreturn_t rio_interrupt (int irq, void *ptr, struct pt_regs *regs)
{
  struct Host *HostP;
  func_enter ();

  HostP = (struct Host*)ptr; /* &p->RIOHosts[(long)ptr]; */
  rio_dprintk (RIO_DEBUG_IFLOW, "rio: enter rio_interrupt (%d/%d)\n", 
               irq, HostP->Ivec); 

  /* AAargh! The order in which to do these things is essential and
     not trivial. 
     
     - Rate limit goes before "recursive". Otherwise a series of
       recursive calls will hang the machine in the interrupt routine. 

     - hardware twiddling goes before "recursive". Otherwise when we
       poll the card, and a recursive interrupt happens, we won't
       ack the card, so it might keep on interrupting us. (especially
       level sensitive interrupt systems like PCI).

     - Rate limit goes before hardware twiddling. Otherwise we won't
       catch a card that has gone bonkers.

     - The "initialized" test goes after the hardware twiddling. Otherwise
       the card will stick us in the interrupt routine again.

     - The initialized test goes before recursive. 
  */



#ifdef IRQ_RATE_LIMIT
  /* Aaargh! I'm ashamed. This costs more lines-of-code than the
     actual interrupt routine!. (Well, used to when I wrote that comment) */
  {
    static int lastjif;
    static int nintr=0;

    if (lastjif == jiffies) {
      if (++nintr > IRQ_RATE_LIMIT) {
        free_irq (HostP->Ivec, ptr);
        printk (KERN_ERR "rio: Too many interrupts. Turning off interrupt %d.\n", 
                HostP->Ivec);
      }
    } else {
      lastjif = jiffies;
      nintr = 0;
    }
  }
#endif
  rio_dprintk (RIO_DEBUG_IFLOW, "rio: We've have noticed the interrupt\n"); 
  if (HostP->Ivec == irq) {
    /* Tell the card we've noticed the interrupt. */
    rio_reset_interrupt (HostP);
  }

  if ((HostP->Flags & RUN_STATE) != RC_RUNNING)
  	return IRQ_HANDLED;

  if (test_and_set_bit (RIO_BOARD_INTR_LOCK, &HostP->locks)) {
    printk (KERN_ERR "Recursive interrupt! (host %d/irq%d)\n", 
            (int) ptr, HostP->Ivec);
    return IRQ_HANDLED;
  }