606 lines
16 KiB
C
606 lines
16 KiB
C
/*
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* FreeBSD device driver for B004-compatible Transputer boards.
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*
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* based on Linux version Copyright (C) 1993 by Christoph Niemann
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*
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* Rewritten for FreeBSD by
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* Luigi Rizzo (luigi@iet.unipi.it) and
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* Lorenzo Vicisano (l.vicisano@iet.unipi.it)
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* Dipartimento di Ingegneria dell'Informazione
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* Universita` di Pisa
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* via Diotisalvi 2, 56126 Pisa, ITALY
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* 14 september 1994
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christoph Niemann,
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* Luigi Rizzo and Lorenzo Vicisano - Dipartimento di Ingegneria
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* dell'Informazione
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* 4. The names of these contributors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* NOTE NOTE NOTE
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* The assembler version is still under development.
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*/
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/* #define USE_ASM */
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#include "bqu.h"
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#if NBQU > 0
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#include <sys/param.h>
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#include <sys/systm.h> /* for min(), SELWAIT */
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/* #include "proc.h" /* for pid_t */
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/* #include "user.h" */
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/* #include "buf.h" */
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/* #include "kernel.h" */
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#include <sys/uio.h>
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/* #include "sys/ioctl.h" */
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/* #include "syslog.h" */
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#include <i386/isa/isa_device.h>
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#include <sys/errno.h>
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#include "b004.h"
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#define IOCTL_OUT(arg, ret) *(int*)arg = ret
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#define B004PRI (PZERO+8)
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#define B004_CHANCE 8
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/*
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* Define these symbols if you want to debug the code.
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*/
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#undef B004_DEBUG
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#undef B004_DEBUG_2
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#ifdef B004_DEBUG
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#define out(port,data) d_outb(port, data)
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#define in(a) d_inb(((u_int)a))
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#else
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#define out(port, data) outb(port,data)
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#define in(port) inb(((u_int)port))
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#endif B004_DEBUG
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#ifdef B004_DEBUG
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#define DEB(x) x
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#define NO_DEB(x) /* */
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#else
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#define DEB(x) /* */
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#define NO_DEB(x) x
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#endif
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#ifdef B004_DEBUG_2
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#define DEB2(x) x
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#else
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#define DEB2(x)
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#endif
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int bquclose(dev_t dev, int flag);
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int bquopen(dev_t dev, int flag);
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int bquwrite(dev_t dev, struct uio *uio, int flag);
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int bquread(dev_t dev, struct uio *uio, int flag);
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int bquioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p);
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int bquselect(dev_t dev, int rw, struct proc *p);
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int bquprobe(struct isa_device *idp);
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int bquattach(struct isa_device *idp);
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struct isa_driver bqudriver = {
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bquprobe, bquattach, "bqu"
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};
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static int b004_sleep; /* wait address */
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static struct b004_struct b004_table[NBQU];
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static int first_time=1;
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/*
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* At these addresses the driver will search for B004-compatible boards
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*/
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static int
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b004_base_addresses[B004_CHANCE] = {
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/* 0x150, 0x170, 0x190, 0x200, 0x300, 0x320, 0x340, 0x360 */
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0x150, 0x190, 0, 0, 0, 0, 0, 0
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};
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void
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d_outb(u_int port, u_char data)
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{
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printf("OUT 0x%x TO 0x%x\n",data,port);
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outb(port,data);
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}
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u_char d_inb(u_int port)
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{
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u_char ap;
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ap=inb(port);
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printf("INPUT 0x%x FROM 0x%x\n",ap,port);
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return(ap);
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}
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static int
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detected(int base)
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{
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int i;
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for(i=0;i<NBQU;i++)
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if ((B004_F(i) & B004_EXIST) && (B004_BASE(i)==base)) return 1;
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return (0);
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}
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#define b004_delay(a) DELAY(10000)
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/*
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* static void bqureset(): reset transputer network.
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*
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*/
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static void
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bqureset( const int dev_min )
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{
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DEB(printf("B004 resetting transputer at link %d.\n", dev_min);)
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out(B004_BASE(dev_min)+B004_ANALYSE_OFFSET, B004_DEASSERT_ANALYSE);
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b004_delay(dev_min);
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out(B004_BASE(dev_min) + B004_RESET_OFFSET, B004_DEASSERT_RESET);
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b004_delay(dev_min);
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out(B004_BASE(dev_min) + B004_RESET_OFFSET, B004_ASSERT_RESET);
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b004_delay(dev_min);
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out(B004_BASE(dev_min) + B004_RESET_OFFSET, B004_DEASSERT_RESET);
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b004_delay(dev_min);
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DEB(printf("B004 reset done.\n");)
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}
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/*
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* static void bquanalyse(): switch transputer network to analyse mode.
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*
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*/
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static void
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bquanalyse( const int dev_min )
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{
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DEB(printf("B004 analysing transputer at link %d.\n", dev_min);)
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out(B004_BASE(dev_min) + B004_ANALYSE_OFFSET, B004_DEASSERT_ANALYSE);
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b004_delay(dev_min);
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out(B004_BASE(dev_min) + B004_ANALYSE_OFFSET, B004_ASSERT_ANALYSE);
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b004_delay(dev_min);
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out(B004_BASE(dev_min) + B004_RESET_OFFSET, B004_ASSERT_RESET);
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b004_delay(dev_min);
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out(B004_BASE(dev_min) + B004_RESET_OFFSET, B004_DEASSERT_RESET);
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b004_delay(dev_min);
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out(B004_BASE(dev_min) + B004_ANALYSE_OFFSET, B004_DEASSERT_ANALYSE);
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b004_delay(dev_min);
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DEB(printf("B004 switching to analyse-mode done.\n");)
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}
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/****************************************************************************
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*
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* int bquread() - read bytes from the link interface.
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*
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* At first, the driver checks if the link-interface is ready to send a byte
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* to the PC. If not, this check is repeated up to B004_MAXTRY times.
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* If the link-interface is not ready after this loop, the driver sleeps for
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* an NO=1 ticks and then checks the link-interface again.
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* If the interface is still not ready, repeats as above incrementing NO.
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* Once almost one byte is read N0 is set to 1.
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* If B004_TIMEOUT != 0 and the link-interface is not ready for more than
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* B004_TIMEOUT ticks read aborts returnig with the number of bytes read
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* or with an error if no byte was read.
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*
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* By default, B004_TIMEOUT is = 0 (read is blocking)
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*
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*****************************************************************************/
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int
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bquread(dev_t dev, struct uio *uio, int flag)
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{
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unsigned int dev_min = minor(dev) & 7;
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int timeout=B004_TIMEOUT(dev_min);
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int Timeout=timeout;
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int idr=B004_IDR(dev_min);
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int isr=B004_ISR(dev_min);
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char buffer[B004_MAX_BYTES];
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if ( uio->uio_resid < 0) {
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DEB(printf("B004: invalid count for reading = %d.\n", uio->uio_resid);)
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return EINVAL;
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}
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while ( uio->uio_resid ) {
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int sleep_ticks=0;
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char *p, *last, *lim;
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int i, end = min(B004_MAX_BYTES,uio->uio_resid);
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lim= &buffer[end];
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for (p= buffer; p<lim;) {
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last=p;
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/*** try to read as much as possible ***/
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#ifdef USE_ASM
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/* assembly code uses a very tight loop, with
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* BX= data port, DX= address port, CX=count, ES:DI=p, AL=data, AH=1
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* SI=retry counter
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*/
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__asm__ (
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"movl %1, %%edx\n\t" /* isr */
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"movl %2, %%ebx\n\t" /* idr */
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"movl %3, %%edi\n" /* p */
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"movl %4, %%ecx\n\t" /* lim */
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"subl %%edi, %%ecx\n\t"
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"push %%es\n\t"
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"movw %%ss, %%ax\n\t" /** prepare ES, DF for transfer */
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"movw %%ax, %%es\n\t"
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"cld\n\t"
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"movb $1, %%ah\n\t"
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"1:\tinb %%dx, %%al\n\t"
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"testb %%ah, %%al\n\t"
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"jz 2f\n\t"
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"xchgl %%edx, %%ebx\n\t"
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"insb\n\t"
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"xchgl %%edx, %%ebx\n"
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"2:\tloop 1b\n\t"
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"pop %%es\n\t"
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"movl %%edi, %0\n\t" /* store p */
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: /* out */ "=g" (p)
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: /* in */ "g" (isr), "g" (idr), "g" (p), "g" (lim)
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: /* regs */ "eax", "ebx", "edx", "ecx", "edi");
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#else
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for (i=lim - p; i-- ;)
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if (inb(isr)&B004_READBYTE) *p++ =(char) inb(idr);
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#endif
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if (last!=p) {
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sleep_ticks = 0;
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} else {
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/*** no new data read, must sleep ***/
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sleep_ticks= (sleep_ticks<20 ? sleep_ticks+1 : sleep_ticks);
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if (Timeout) {
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if (timeout <=0) {
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DEB2(printf("Read : TIMEOUT OCCURRED XXXXXXXXXXX\n");)
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break;
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}
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if (timeout < sleep_ticks) sleep_ticks=timeout;
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timeout -= sleep_ticks;
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}
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DEB2(printf("Read: SLEEPING FOR %d TICKS XXXXX\n",sleep_ticks);)
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if (tsleep((caddr_t)&b004_sleep, B004PRI | PCATCH,
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"b004_rd", sleep_ticks)!=EWOULDBLOCK) return 1;
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}
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}
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if (p != buffer) {
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uiomove((caddr_t)buffer, p - buffer, uio);
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}
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if( (Timeout) && (timeout <= 0) )
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break;
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}
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return 0;
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} /* bquread() */
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/*
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* int bquwrite() - write to the link interface.
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*/
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int
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bquwrite(dev_t dev, struct uio *uio, int flag)
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{
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unsigned int dev_min = minor(dev) & 7;
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int i, end;
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int timeout=B004_TIMEOUT(dev_min);
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int Timeout=timeout;
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int odr=B004_ODR(dev_min);
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int osr=B004_OSR(dev_min);
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char buffer[B004_MAX_BYTES];
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if ( uio->uio_resid < 0) {
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DEB(printf("B004 invalid argument for writing: count = %d.\n", uio->uio_resid);)
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return EINVAL;
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}
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while ( uio->uio_resid ) {
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int sleep_ticks=0;
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char *p, *last, *lim;
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end = min(B004_MAX_BYTES,uio->uio_resid);
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uiomove((caddr_t)buffer, end, uio);
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lim= &buffer[end];
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for (p= &buffer[0]; p<lim;) {
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last=p;
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#ifdef USE_ASM
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/* assembly code uses a very tight loop, with
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* BX= data port, DX= address port, CX=count, DS:SI=p, AL=data, AH=1
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* DI= retry counter
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* Unfortunately, C is almost as fast as this!
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*/
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__asm__ (
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"movl %1, %%edx\n\t" /* osr */
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"movl %2, %%ebx\n\t" /* odr */
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"movl %3, %%esi\n" /* p */
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"movl %4, %%ecx\n\t" /* lim */
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"subl %%esi, %%ecx\n\t"
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"push %%ds\n\t"
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"movw %%ss, %%ax\n\t" /** prepare DS, DF for transfer */
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"movw %%ax, %%ds\n\t"
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"cld\n\t"
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"movb $1, %%ah\n\t"
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"movw $100, %%di\n\t"
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"1:\tinb %%dx, %%al\n\t"
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"testb %%ah, %%al\n\t"
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"jz 2f\n\t"
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"xchgl %%edx, %%ebx\n\t"
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"outsb\n\t"
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"xchgl %%edx, %%ebx\n\t"
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"loop 1b\n\t"
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"jmp 3f\n"
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"2:\tdec %%di\n\t"
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"jnc 1b\n\t"
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"3:\tpop %%ds\n"
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"movl %%esi, %0\n\t" /* store p */
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: /* out */ "=g" (p)
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: /* in */ "g" (osr), "g" (odr), "g" (p), "g" (lim)
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: /* regs */ "eax", "ebx", "edx", "ecx", "esi", "edi");
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#else
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for (i=lim - p; i-- ; ) {
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if (inb(osr)&B004_WRITEBYTE) outb(odr, *p++);
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}
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#endif
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if (p != last ) {
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sleep_ticks=0;
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} else {
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sleep_ticks= (sleep_ticks<20 ? sleep_ticks+1 : sleep_ticks);
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if (Timeout) {
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if (timeout <=0) {
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DEB2(printf("Write : TIMEOUT OCCURRED XXXXXXXXXXX\n");)
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uio->uio_resid += (lim - p);
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break;
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}
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if (timeout < sleep_ticks) sleep_ticks=timeout;
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timeout -= sleep_ticks;
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}
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DEB2(printf("Write: SLEEPING FOR %d TICKS XXXXXXX\n",sleep_ticks);)
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if (tsleep((caddr_t)&b004_sleep, B004PRI | PCATCH,
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"b004_rd", sleep_ticks)!=EWOULDBLOCK) return 1;
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}
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}
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if( (Timeout) && (timeout <= 0) )
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break;
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}
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return 0;
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} /* bquwrite() */
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/*
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* int bquopen() -- open the link-device.
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*
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*/
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int
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bquopen(dev_t dev, int flag)
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{
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unsigned int dev_min = minor(dev) & 7;
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if (dev_min >= NBQU) {
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DEB(printf("B004 not opened, minor number >= %d.\n", NBQU);)
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return ENXIO;
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}
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if ((B004_F(dev_min) & B004_EXIST) == 0) {
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DEB(printf("B004 not opened, board %d does not exist.\n", dev_min);)
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return ENXIO;
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}
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if (B004_F(dev_min) & B004_BUSY) {
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DEB(printf("B004 not opened, board busy (minor = %d).\n", dev_min);)
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return EBUSY;
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}
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B004_F(dev_min) |= B004_BUSY;
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B004_TIMEOUT(dev_min) = 0;
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DEB(printf( "B004 opened, minor = %d.\n", dev_min );)
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return 0;
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} /* bquopen() */
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/*
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* int b004close() -- close the link device.
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*/
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int
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bquclose(dev_t dev, int flag)
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{
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unsigned int dev_min = minor(dev) & 7;
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if (dev_min >= NBQU) {
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DEB(printf("B004 not released, minor number >= %d.\n", NBQU);)
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return ENXIO;
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}
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B004_F(dev_min) &= ~B004_BUSY;
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DEB(printf("B004(%d) released.\n", dev_min );)
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return 0;
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}
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int
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bquselect(dev_t dev, int rw, struct proc *p)
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{
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/* still unimplemented */
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return(1);
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}
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/*
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* int bquioctl()
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*
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* Supported functions:
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* - reset
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* - analyse
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* - test error flag
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* - set timeout
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*/
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int
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bquioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
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{
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unsigned int dev_min = minor(dev) & 7;
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int result = 0;
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if (dev_min >= NBQU) {
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DEB(printf("B004 ioctl exit, minor >= %d.\n", NBQU );)
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return ENODEV;
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}
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if ((B004_F(dev_min) & B004_EXIST) == 0) {
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DEB(printf("B004 ioctl exit, (B004_F & B004_EXIST) == 0.\n" );)
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return ENODEV;
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}
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switch ( cmd ) {
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case B004RESET: /* reset transputer */
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bqureset(dev_min);
|
|
DEB(printf("B004 ioctl B004RESET, done\n" );)
|
|
break;
|
|
case B004WRITEABLE: /* can we write a byte to the C012 ? */
|
|
IOCTL_OUT (addr, ((in(B004_OSR(dev_min))&B004_WRITEBYTE) != 0 ));
|
|
break;
|
|
case B004READABLE: /* can we read a byte from C012 ? */
|
|
IOCTL_OUT (addr, ((in(B004_ISR(dev_min)) & B004_READBYTE) != 0 ));
|
|
break;
|
|
case B004ANALYSE: /* switch transputer to analyse mode */
|
|
bquanalyse(dev_min);
|
|
break;
|
|
case B004ERROR: /* test error-flag */
|
|
IOCTL_OUT (addr,
|
|
((inb(B004_BASE(dev_min)+B004_ERROR_OFFSET) &
|
|
B004_TEST_ERROR) ? 0 : 1));
|
|
break;
|
|
case B004TIMEOUT: /* set, retrieve timeout for writing & reading*/
|
|
B004_TIMEOUT(dev_min) = *((int *)addr);
|
|
break;
|
|
default: result = EINVAL;
|
|
}
|
|
return result;
|
|
} /* bquioctl() */
|
|
|
|
int
|
|
bquattach(struct isa_device *idp)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* int bquprobe
|
|
*
|
|
* Initializes the driver. It tries to detect the hardware
|
|
* and sets up all relevant data-structures.
|
|
*/
|
|
|
|
int
|
|
bquprobe(struct isa_device *idp)
|
|
{
|
|
unsigned int test;
|
|
unsigned int dev_min = idp->id_unit;
|
|
int i,found = 0;
|
|
/* After a reset it should be possible to write a byte to
|
|
the B004. So let'S do a reset and then test the output status
|
|
register
|
|
*/
|
|
#ifdef undef
|
|
printf("bquprobe::\nIOBASE 0x%x\nIRQ %d\nDRQ %d\nMSIZE %d\nUNIT %d\nFLAGS x0%x\nALIVE %d\n",idp->id_iobase,idp->id_irq,idp->id_drq,idp->id_msize,idp->id_unit,idp->id_flags,idp->id_alive);
|
|
#endif
|
|
if(first_time){
|
|
for(i=0;i<NBQU;i++) B004_F(i) &= ~B004_EXIST;
|
|
first_time=0;
|
|
}
|
|
|
|
if(dev_min >= NBQU) return (0); /* No more descriptors */
|
|
if ((idp->id_iobase < 0x100) || (idp->id_iobase >= 0x1000))
|
|
idp->id_iobase=0; /* Dangerous isa addres ) */
|
|
for (test = 0; (test < B004_CHANCE); test++) {
|
|
if((idp->id_iobase==0)&&((!b004_base_addresses[test])||
|
|
detected(b004_base_addresses[test])))
|
|
continue;
|
|
idp->id_iobase=b004_base_addresses[test];
|
|
|
|
DEB(printf("Probing device %d at address 0x%x\n",dev_min,
|
|
idp->id_iobase);
|
|
)
|
|
b004_delay(test);
|
|
B004_F(dev_min) = 0;
|
|
B004_TIMEOUT(dev_min) = B004_INIT_TIMEOUT;
|
|
B004_BASE(dev_min) = idp->id_iobase;
|
|
B004_ODR(dev_min) = B004_BASE(dev_min) + B004_ODR_OFFSET;
|
|
B004_ISR(dev_min) = B004_BASE(dev_min) + B004_ISR_OFFSET;
|
|
B004_OSR(dev_min) = B004_BASE(dev_min) + B004_OSR_OFFSET;
|
|
bqureset(dev_min);
|
|
|
|
for (i = 0; i < B004_MAXTRY; i++)
|
|
if ( in(B004_OSR(dev_min)) == B004_WRITEBYTE) {
|
|
B004_F(dev_min) |= B004_EXIST;
|
|
out(B004_BASE(dev_min) + B008_INT_OFFSET, 0);
|
|
b004_delay(test);
|
|
if (in(B004_BASE(dev_min) + B008_INT_OFFSET) & 0x0f == 0)
|
|
B004_BOARDTYPE(dev_min) = B008;
|
|
else
|
|
B004_BOARDTYPE(dev_min) = B004;
|
|
printf("bqu%d at 0x0%x (polling) is a B00%s\n",
|
|
dev_min,B004_IDR(dev_min),
|
|
(B004_BOARDTYPE(dev_min) == B004) ? "4" : "8");
|
|
found = 1;
|
|
break;
|
|
}
|
|
if(!found) {
|
|
idp->id_iobase=0;
|
|
}
|
|
else break;
|
|
|
|
}
|
|
|
|
if (!found){
|
|
printf("b004probe(): no B004-board found.\n");
|
|
return (0);
|
|
}
|
|
|
|
idp->id_maddr=NULL;
|
|
idp->id_irq=0;
|
|
if(B004_BOARDTYPE(dev_min) == B004)
|
|
return(18);
|
|
else
|
|
return(20);
|
|
} /* bquprobe() */
|
|
|
|
#endif /* NBQU */
|