FreeBSD/Linux Kernel Cross Reference
sys/dev/isa/atppc_isa.c

     /* $NetBSD: atppc_isa.c,v 1.5 2004/01/28 13:51:16 drochner Exp $ */
     
     /*-
      * Copyright (c) 2001 Alcove - 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.
     *
     * FreeBSD: src/sys/isa/ppc.c,v 1.26.2.5 2001/10/02 05:21:45 nsouch Exp
     *
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: atppc_isa.c,v 1.5 2004/01/28 13:51:16 drochner Exp $");
    
    #include "opt_atppc.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/device.h>
    
    #include <machine/intr.h>
    #include <machine/bus.h>
    
    #include <dev/isa/isareg.h>
    #include <dev/isa/isavar.h>
    #include <dev/isa/isadmavar.h>
    
    #include <dev/ic/atppcreg.h>
    #include <dev/ic/atppcvar.h>
    #include <dev/isa/atppc_isadma.h>
    
    /*
     * ISA bus attach code for atppc driver.
     * Note on capabilities: capabilites may exist in the chipset but may not
     * necessarily be useable. I.e. you may specify an IRQ in the autoconfig, but
     * will the port actually have an IRQ assigned to it at the hardware level?
     * How can you test if the capabilites can be used? For interrupts, see if a
     * handler exists (sc_intr != NULL). For DMA, see if the sc_dma_start() and
     * sc_dma_finish() function pointers are not NULL.
     */
    
    /* Configuration data for atppc on isa bus. */
    struct atppc_isa_softc {
            /* Machine independent device data */
            struct atppc_softc sc_atppc;
    
            /* IRQ/DRQ/IO Port assignments on ISA bus */
            int sc_irq;
            int sc_drq;
            int sc_iobase;
    
            /* ISA chipset tag */
            isa_chipset_tag_t sc_ic;
    };
    
    /* Probe and attach functions for a atppc device on the ISA bus. */
    static int atppc_isa_probe __P((struct device *, struct cfdata *, void *));
    static void atppc_isa_attach __P((struct device *, struct device *, void *));
    
    static int atppc_isa_dma_start(struct atppc_softc *, void *, u_int,
            u_int8_t);
    static int atppc_isa_dma_finish(struct atppc_softc *);
    static int atppc_isa_dma_abort(struct atppc_softc *);
    static int atppc_isa_dma_malloc(struct device *, caddr_t *, bus_addr_t *,
            bus_size_t);
    static void atppc_isa_dma_free(struct device *, caddr_t *, bus_addr_t *,
            bus_size_t);
    
    CFATTACH_DECL(atppc_isa, sizeof(struct atppc_isa_softc), atppc_isa_probe,
            atppc_isa_attach, NULL, NULL);
    
    /*
     * Probe function: find parallel port controller on isa bus. Combined from
     * lpt_isa_probe() in lpt.c and atppc_detect_port() from FreeBSD's ppc.c.
     */
    static int
    atppc_isa_probe(struct device *parent, struct cfdata *cf, void *aux)
   {
           bus_space_handle_t ioh;
           struct isa_attach_args *ia = aux;
           bus_space_tag_t iot = ia->ia_iot;
           int rval = 0;
   
           if (ia->ia_nio < 1)
                   return (0);
   
           /* Disallow wildcarded i/o address */
           if (ia->ia_io[0].ir_addr == ISACF_PORT_DEFAULT)
                   return (0);
   
           if (bus_space_map(iot, ia->ia_io[0].ir_addr, IO_LPTSIZE, 0, &ioh))
                   return (0);
   
           if (atppc_detect_port(iot, ioh) == 0)
                   rval = 1;
   
           bus_space_unmap(iot, ioh, IO_LPTSIZE);
   
           if (rval) {
                   ia->ia_nio = 1;
                   ia->ia_io[0].ir_size = IO_LPTSIZE;
                   ia->ia_nirq = 1;
                   ia->ia_ndrq = 1;
                   ia->ia_niomem = 0;
           }
           return (rval);
   }
   
   /* Attach function: attach and configure parallel port controller on isa bus. */
   static void
   atppc_isa_attach(struct device *parent, struct device *self, void *aux)
   {
           struct atppc_isa_softc *sc = (struct atppc_isa_softc *)self;
           struct atppc_softc *lsc = &sc->sc_atppc;
           struct isa_attach_args *ia = aux;
   
           printf(": AT Parallel Port\n");
   
           lsc->sc_iot = ia->ia_iot;
           lsc->sc_dmat = ia->ia_dmat;
           lsc->sc_has = 0;
           sc->sc_ic = ia->ia_ic;
           sc->sc_iobase = ia->ia_io->ir_addr;
   
           if (bus_space_map(lsc->sc_iot, sc->sc_iobase, IO_LPTSIZE, 0,
                   &lsc->sc_ioh) != 0) {
                   printf("%s: attempt to map bus space failed, device not "
                           "properly attached.\n", self->dv_xname);
                   lsc->sc_dev_ok = ATPPC_NOATTACH;
                   return;
           }
   
           lsc->sc_dev_ok = ATPPC_ATTACHED;
   
           /* Assign interrupt handler */
           if (!(self->dv_cfdata->cf_flags & ATPPC_FLAG_DISABLE_INTR)
              && ia->ia_irq->ir_irq != ISACF_IRQ_DEFAULT
              && ia->ia_nirq >= 1) {
                   sc->sc_irq = ia->ia_irq[0].ir_irq;
           } else
                   sc->sc_irq = -1;
   
           if (sc->sc_irq > 0) {
                   /* Establish interrupt handler. */
                   lsc->sc_ieh = isa_intr_establish(sc->sc_ic, sc->sc_irq,
                           IST_EDGE, IPL_ATPPC, atppcintr, &lsc->sc_dev);
   
                   lsc->sc_has |= ATPPC_HAS_INTR;
           }
   
           /* Configure DMA */
           if (!(self->dv_cfdata->cf_flags & ATPPC_FLAG_DISABLE_DMA)
               && ia->ia_drq->ir_drq != ISACF_DRQ_DEFAULT
               && ia->ia_ndrq >= 1)
                   sc->sc_drq = ia->ia_drq[0].ir_drq;
           else
                   sc->sc_drq = -1;
   
           if (sc->sc_drq != -1
               && atppc_isadma_setup(lsc, sc->sc_ic, sc->sc_drq) == 0) {
                   lsc->sc_has |= ATPPC_HAS_DMA;
   
                   /* setup DMA hooks */
                   lsc->sc_dma_start = atppc_isa_dma_start;
                   lsc->sc_dma_finish = atppc_isa_dma_finish;
                   lsc->sc_dma_abort = atppc_isa_dma_abort;
                   lsc->sc_dma_malloc = atppc_isa_dma_malloc;
                   lsc->sc_dma_free = atppc_isa_dma_free;
           }
   
           /* Run soft configuration attach */
           atppc_sc_attach(lsc);
   
           return;
   }
   
   /* Start DMA operation over ISA bus */
   static int
   atppc_isa_dma_start(struct atppc_softc *lsc, void *buf, u_int nbytes,
           u_int8_t mode)
   {
           struct atppc_isa_softc *sc = (struct atppc_isa_softc *)lsc;
   
           return atppc_isadma_start(sc->sc_ic, sc->sc_drq, buf, nbytes, mode);
   }
   
   /* Stop DMA operation over ISA bus */
   static int
   atppc_isa_dma_finish(struct atppc_softc *lsc)
   {
           struct atppc_isa_softc *sc = (struct atppc_isa_softc *)lsc;
   
           return atppc_isadma_finish(sc->sc_ic, sc->sc_drq);
   }
   
   /* Abort DMA operation over ISA bus */
   static int
   atppc_isa_dma_abort(struct atppc_softc *lsc)
   {
           struct atppc_isa_softc *sc = (struct atppc_isa_softc *)lsc;
   
           return atppc_isadma_abort(sc->sc_ic, sc->sc_drq);
   }
   
   /* Allocate memory for DMA over ISA bus */
   static int
   atppc_isa_dma_malloc(struct device *dev, caddr_t *buf, bus_addr_t *bus_addr,
           bus_size_t size)
   {
           struct atppc_isa_softc *sc = (struct atppc_isa_softc *)dev;
   
           return atppc_isadma_malloc(sc->sc_ic, sc->sc_drq, buf, bus_addr, size);
   }
   
   /* Free memory allocated by atppc_isa_dma_malloc() */
   static void
   atppc_isa_dma_free(struct device *dev, caddr_t *buf, bus_addr_t *bus_addr,
           bus_size_t size)
   {
           struct atppc_isa_softc *sc = (struct atppc_isa_softc *)dev;
   
           return atppc_isadma_free(sc->sc_ic, sc->sc_drq, buf, bus_addr, size);
   }

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