//****************************************************************************// Copyright (C) 2001,2002,2003  PEAK System-Technik GmbH//// linux@peak-system.com// www.peak-system.com//// 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.//// Maintainer(s): Klaus Hitschler (klaus.hitschler@gmx.de)//****************************************************************************//****************************************************************************//// all parts of the isa hardware for pcan-isa devices//// $Log: pcan_isa.c,v $// Revision 1.23  2003/03/02 10:58:07  klaus// merged USB thread into main path//// Revision 1.22  2003/03/02 10:58:07  klaus// merged USB thread into main path//// Revision 1.21.2.5  2003/01/29 20:34:20  klaus// release_20030129_a and release_20030129_u released//// Revision 1.21.2.4  2003/01/29 20:34:20  klaus// release_20030129_a and release_20030129_u released//// Revision 1.21.2.3  2003/01/28 23:28:26  klaus// reorderd pcan_usb.c and pcan_usb_kernel.c, tidied up//// Revision 1.21.2.2  2003/01/14 20:31:53  klaus// read/write/minor assigment is working////****************************************************************************//****************************************************************************// INCLUDES#include <src/pcan_common.h>     // must always be the 1st include#include <linux/errno.h>#include <linux/ioport.h>#include <linux/sched.h>#include <asm/io.h>#include <src/pcan_isa.h>#include <src/pcan_sja1000.h>//****************************************************************************// DEFINES#define PCAN_ISA_MINOR_BASE 8    // starting point of minors for ISA devices  #define ISA_PORT_SIZE       0x20 // the address range of the isa-port#define ISA_DEFAULT_COUNT   2    // count of defaults for init//****************************************************************************// GLOBALS//****************************************************************************// LOCALSstatic u16 isa_ports[] = {0x300, 0x320};  // default values for pcan-isastatic u8  isa_irqs[]  = {10, 5};static u16 isa_devices = 0;        // the number of accepted isa_devices//****************************************************************************// CODE  static u8 pcan_isa_readreg(struct pcandev *dev, u8 port) // read a register{  return inb(dev->port.isa.dwPort + port);}static void pcan_isa_writereg(struct pcandev *dev, u8 port, u8 data) // write a register{  outb(data, dev->port.isa.dwPort + port);}static int pcan_isa_req_irq(struct pcandev *dev){  int err;    if (dev->wInitStep == 3)  {    if ((err = request_irq(dev->port.isa.wIrq, sja1000_irqhandler, SA_INTERRUPT | SA_SHIRQ, "pcan", dev)))      return err;      dev->wInitStep++;  }      return 0;}static void pcan_isa_free_irq(struct pcandev *dev){  if (dev->wInitStep == 4)  {    free_irq(dev->port.isa.wIrq, dev);     dev->wInitStep--;  }}// release and probe functionstatic int pcan_isa_cleanup(struct pcandev *dev){  DPRINTK(KERN_DEBUG "%s: pcan_isa_cleanup()\n", DEVICE_NAME);  switch(dev->wInitStep)  {    case 4: pcan_isa_free_irq(dev);    case 3: isa_devices--;    case 2:    case 1: release_region(dev->port.isa.dwPort, ISA_PORT_SIZE);    case 0: dev->wInitStep = 0;  }    return 0;}static int pcan_isa_probe(struct pcandev *dev) // probe for type{  return (check_region(dev->port.isa.dwPort, ISA_PORT_SIZE)) ? -EBUSY : 0;}// interface depended open and closestatic int pcan_isa_open(struct pcandev *dev){  return 0;}static int pcan_isa_release(struct pcandev *dev){  return 0;}int  pcan_isa_init(struct pcandev *dev, u32 dwPort, u16 wIrq){  int err;    DPRINTK(KERN_DEBUG "%s: pcan_isa_init(), isa_devices = %d\n", DEVICE_NAME, isa_devices);  // init process wait queues  init_waitqueue_head(&dev->read_queue);  init_waitqueue_head(&dev->write_queue);    // set this before any instructions, fill struct pcandev, part 1  	dev->wInitStep   = 0;             dev->readreg     = pcan_isa_readreg;  dev->writereg    = pcan_isa_writereg;  dev->cleanup     = pcan_isa_cleanup;  dev->req_irq     = pcan_isa_req_irq;  dev->free_irq    = pcan_isa_free_irq;  dev->open        = pcan_isa_open;  dev->release     = pcan_isa_release;  // reject illegal combination  if ((!dwPort && wIrq) || (dwPort && !wIrq))    return -EINVAL;  // a default is requested  if (!dwPort)  {    // there's no default available    if (isa_devices >= ISA_DEFAULT_COUNT)      return -ENODEV;        dev->port.isa.dwPort = isa_ports[isa_devices];    dev->port.isa.wIrq   = isa_irqs[isa_devices];      }  else  {    dev->port.isa.dwPort = dwPort;    dev->port.isa.wIrq   = wIrq;      }    	dev->nMinor      = PCAN_ISA_MINOR_BASE + isa_devices;	 	// is the device really available?	  if ((err = pcan_isa_probe(dev)) < 0)    return err;      request_region(dev->port.isa.dwPort, ISA_PORT_SIZE, DEVICE_NAME);  dev->wInitStep = 1;    isa_devices++;   dev->wInitStep = 3;    printk(KERN_INFO "%s: isa device minor %d found (io=0x%04x,irq=%d)\n", DEVICE_NAME,                                dev->nMinor, dev->port.isa.dwPort, dev->port.isa.wIrq);      return 0;}