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      1 /* $NetBSD: atppc_isadma.c,v 1.8 2022/09/25 17:09:36 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2001 Alcove - Nicolas Souchu
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  * FreeBSD: src/sys/isa/ppc.c,v 1.26.2.5 2001/10/02 05:21:45 nsouch Exp
     29  *
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: atppc_isadma.c,v 1.8 2022/09/25 17:09:36 thorpej Exp $");
     34 
     35 #include "opt_atppc.h"
     36 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/kernel.h>
     40 #include <sys/device.h>
     41 
     42 #include <sys/intr.h>
     43 #include <sys/bus.h>
     44 
     45 #include <dev/ic/atppcreg.h>
     46 #include <dev/ic/atppcvar.h>
     47 
     48 #include <dev/isa/isadmavar.h>
     49 #include <dev/isa/isareg.h>
     50 #include <dev/isa/isavar.h>
     51 
     52 #include <dev/isa/atppc_isadma.h>
     53 
     54 /* Enable DMA */
     55 int
     56 atppc_isadma_setup(struct atppc_softc * lsc, isa_chipset_tag_t ic, int drq)
     57 {
     58 	int error = 1;
     59 
     60 	/* Reserve DRQ */
     61 	if (isa_drq_alloc(ic, drq)) {
     62 		ATPPC_DPRINTF(("%s(%s): cannot reserve DRQ line.\n", __func__,
     63 			device_xname(lsc->sc_dev)));
     64 		return error;
     65 	}
     66 
     67 	/* Get maximum DMA size for isa bus */
     68 	lsc->sc_dma_maxsize = isa_dmamaxsize(ic, drq);
     69 
     70 	/* Create dma mapping */
     71 	error = isa_dmamap_create(ic, drq, lsc->sc_dma_maxsize,
     72 		BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW);
     73 
     74 	return error;
     75 }
     76 
     77 /* Start DMA operation over ISA bus */
     78 int
     79 atppc_isadma_start(isa_chipset_tag_t ic, int drq, void *buf, u_int nbytes,
     80 	u_int8_t mode)
     81 {
     82 	return (isa_dmastart(ic, drq, buf, nbytes, NULL,
     83 		((mode == ATPPC_DMA_MODE_WRITE) ? DMAMODE_WRITE :
     84 		DMAMODE_READ) | DMAMODE_DEMAND, ((mode == ATPPC_DMA_MODE_WRITE)
     85 		? BUS_DMA_WRITE : BUS_DMA_READ) | BUS_DMA_NOWAIT));
     86 }
     87 
     88 /* Stop DMA operation over ISA bus */
     89 int
     90 atppc_isadma_finish(isa_chipset_tag_t ic, int drq)
     91 {
     92 	isa_dmadone(ic, drq);
     93 	return 0;
     94 }
     95 
     96 /* Abort DMA operation over ISA bus */
     97 int
     98 atppc_isadma_abort(isa_chipset_tag_t ic, int drq)
     99 {
    100 	isa_dmaabort(ic, drq);
    101 	return 0;
    102 }
    103 
    104 /* Allocate memory for DMA over ISA bus */
    105 int
    106 atppc_isadma_malloc(isa_chipset_tag_t ic, int drq, void **buf, bus_addr_t *bus_addr, bus_size_t size)
    107 {
    108 	int error;
    109 
    110 	error = isa_dmamem_alloc(ic, drq, size, bus_addr, BUS_DMA_WAITOK);
    111 	if (error)
    112 		return error;
    113 
    114 	error = isa_dmamem_map(ic, drq, *bus_addr, size, buf, BUS_DMA_WAITOK);
    115 	if (error)
    116 		isa_dmamem_free(ic, drq, *bus_addr, size);
    117 
    118 	return error;
    119 }
    120 
    121 /* Free memory allocated by atppc_isadma_malloc() */
    122 void
    123 atppc_isadma_free(isa_chipset_tag_t ic, int drq, void ** buf, bus_addr_t * bus_addr, bus_size_t size)
    124 {
    125 	isa_dmamem_unmap(ic, drq, *buf, size);
    126 	isa_dmamem_free(ic, drq, *bus_addr, size);
    127 }
    128