FreeBSD/Linux Kernel Cross Reference
sys/dev/ppbus/ppb_base.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 1997, 1998, 1999 Nicolas Souchu
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/lock.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/mutex.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    
    #include <dev/ppbus/ppbconf.h>
    
    #include "ppbus_if.h"
    
    #include <dev/ppbus/ppbio.h>
    
    MODULE_VERSION(ppbus, 1);
    
    #define DEVTOSOFTC(dev) ((struct ppb_data *)device_get_softc(dev))
    
    /*
     * ppb_poll_bus()
     *
     * Polls the bus
     *
     * max is a delay in 10-milliseconds
     */
    int
    ppb_poll_bus(device_t bus, int max,
                 uint8_t mask, uint8_t status, int how)
    {
            struct ppb_data *ppb = DEVTOSOFTC(bus);
            int i, j, error;
            uint8_t r;
    
            ppb_assert_locked(bus);
    
            /* try at least up to 10ms */
            for (j = 0; j < ((how & PPB_POLL) ? max : 1); j++) {
                    for (i = 0; i < 10000; i++) {
                            r = ppb_rstr(bus);
                            DELAY(1);
                            if ((r & mask) == status)
                                    return (0);
                    }
            }
    
            if (!(how & PPB_POLL)) {
               for (i = 0; max == PPB_FOREVER || i < max-1; i++) {
                    if ((ppb_rstr(bus) & mask) == status)
                            return (0);
    
                    /* wait 10 ms */
                    error = mtx_sleep((caddr_t)bus, ppb->ppc_lock, PPBPRI |
                        (how == PPB_NOINTR ? 0 : PCATCH), "ppbpoll", hz/100);
                    if (error != EWOULDBLOCK)
                            return (error);
               }
            }
    
            return (EWOULDBLOCK);
    }
    
    /*
     * ppb_get_epp_protocol()
     *
     * Return the chipset EPP protocol
     */
    int
    ppb_get_epp_protocol(device_t bus)
   {
           uintptr_t protocol;
   
           ppb_assert_locked(bus);
           BUS_READ_IVAR(device_get_parent(bus), bus, PPC_IVAR_EPP_PROTO, &protocol);
   
           return (protocol);
   }
   
   /*
    * ppb_get_mode()
    *
    */
   int
   ppb_get_mode(device_t bus)
   {
           struct ppb_data *ppb = DEVTOSOFTC(bus);
   
           /* XXX yet device mode = ppbus mode = chipset mode */
           ppb_assert_locked(bus);
           return (ppb->mode);
   }
   
   /*
    * ppb_set_mode()
    *
    * Set the operating mode of the chipset, return the previous mode
    */
   int
   ppb_set_mode(device_t bus, int mode)
   {
           struct ppb_data *ppb = DEVTOSOFTC(bus);
           int old_mode = ppb_get_mode(bus);
   
           ppb_assert_locked(bus);
           if (PPBUS_SETMODE(device_get_parent(bus), mode))
                   return (-1);
   
           /* XXX yet device mode = ppbus mode = chipset mode */
           ppb->mode = (mode & PPB_MASK);
   
           return (old_mode);
   }
   
   /*
    * ppb_write()
    *
    * Write charaters to the port
    */
   int
   ppb_write(device_t bus, char *buf, int len, int how)
   {
   
           ppb_assert_locked(bus);
           return (PPBUS_WRITE(device_get_parent(bus), buf, len, how));
   }
   
   /*
    * ppb_reset_epp_timeout()
    *
    * Reset the EPP timeout bit in the status register
    */
   int
   ppb_reset_epp_timeout(device_t bus)
   {
   
           ppb_assert_locked(bus);
           return(PPBUS_RESET_EPP(device_get_parent(bus)));
   }
   
   /*
    * ppb_ecp_sync()
    *
    * Wait for the ECP FIFO to be empty
    */
   int
   ppb_ecp_sync(device_t bus)
   {
   
           ppb_assert_locked(bus);
           return (PPBUS_ECP_SYNC(device_get_parent(bus)));
   }
   
   /*
    * ppb_get_status()
    *
    * Read the status register and update the status info
    */
   int
   ppb_get_status(device_t bus, struct ppb_status *status)
   {
           uint8_t r;
   
           ppb_assert_locked(bus);
   
           r = status->status = ppb_rstr(bus);
   
           status->timeout = r & TIMEOUT;
           status->error   = !(r & nFAULT);
           status->select  = r & SELECT;
           status->paper_end = r & PERROR;
           status->ack     = !(r & nACK);
           status->busy    = !(r & nBUSY);
   
           return (0);
   }
   
   void
   ppb_lock(device_t bus)
   {
           struct ppb_data *ppb = DEVTOSOFTC(bus);
   
           mtx_lock(ppb->ppc_lock);
   }
   
   void
   ppb_unlock(device_t bus)
   {
           struct ppb_data *ppb = DEVTOSOFTC(bus);
   
           mtx_unlock(ppb->ppc_lock);
   }
   
   struct mtx *
   ppb_get_lock(device_t bus)
   {
           struct ppb_data *ppb = DEVTOSOFTC(bus);
   
           return (ppb->ppc_lock);
   }
   
   void
   _ppb_assert_locked(device_t bus, const char *file, int line)
   {
   
           mtx_assert_(DEVTOSOFTC(bus)->ppc_lock, MA_OWNED, file, line);
   }
   
   void
   ppb_init_callout(device_t bus, struct callout *c, int flags)
   {
           struct ppb_data *ppb = DEVTOSOFTC(bus);
   
           callout_init_mtx(c, ppb->ppc_lock, flags);
   }
   
   int
   ppb_sleep(device_t bus, void *wchan, int priority, const char *wmesg, int timo)
   {
           struct ppb_data *ppb = DEVTOSOFTC(bus);
   
           return (mtx_sleep(wchan, ppb->ppc_lock, priority, wmesg, timo));
   }

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