/* $NetBSD: irongate_dma.c,v 1.10 2021/07/04 22:42:36 thorpej Exp $ */

/*-
* Copyright (c) 2000, 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/*
* DMA support for the AMD 751 (``Irongate'') core logic chipset.
*
* The AMD 751 is really unlike all of the other Alpha PCI core logic
* chipsets.  Instead, it looks like a normal PC chipset (not surprising,
* since it is used for Athlon processors).
*
* Because of this, it lacks all of the SGMAP hardware normally present
* on an Alpha system, and there are no DMA windows.  Instead, a memory
* bus address is a PCI DMA address, and ISA DMA above 16M has to be
* bounced (this is not unlike the Jensen, actually).
*/

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: irongate_dma.c,v 1.10 2021/07/04 22:42:36 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>

#define _ALPHA_BUS_DMA_PRIVATE
#include <sys/bus.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>

#include <alpha/pci/irongatereg.h>
#include <alpha/pci/irongatevar.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>

#include <machine/alpha.h>

static bus_dma_tag_t irongate_dma_get_tag(bus_dma_tag_t, alpha_bus_t);

void
irongate_page_physload(unsigned long const start_pfn,
   unsigned long const end_pfn)
{
       /*
        * The Irongate does not have SGMAP DMA.  For this reason, we
        * need to protect the first 16MB of RAM from random allocations
        * in order to give ISA DMA a snowball's chance of working.
        */
       alpha_page_physload_sheltered(start_pfn, end_pfn,
           0, alpha_btop(0x1000000));
}

void
irongate_dma_init(struct irongate_config *icp)
{
       bus_dma_tag_t t;

       /*
        * Initialize the DMA tag used for PCI DMA.
        */
       t = &icp->ic_dmat_pci;
       t->_cookie = icp;
       t->_wbase = 0;
       t->_wsize = 0x100000000UL;
       t->_next_window = NULL;
       t->_boundary = 0;
       t->_sgmap = NULL;
       t->_get_tag = irongate_dma_get_tag;
       t->_dmamap_create = _bus_dmamap_create;
       t->_dmamap_destroy = _bus_dmamap_destroy;
       t->_dmamap_load = _bus_dmamap_load_direct;
       t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
       t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
       t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
       t->_dmamap_unload = _bus_dmamap_unload;
       t->_dmamap_sync = _bus_dmamap_sync;

       t->_dmamem_alloc = _bus_dmamem_alloc;
       t->_dmamem_free = _bus_dmamem_free;
       t->_dmamem_map = _bus_dmamem_map;
       t->_dmamem_unmap = _bus_dmamem_unmap;
       t->_dmamem_mmap = _bus_dmamem_mmap;

       /*
        * Initialize the DMA tag used for ISA DMA.
        */
       t = &icp->ic_dmat_isa;
       t->_cookie = icp;
       t->_wbase = 0;
       t->_wsize = 0x1000000;
       t->_next_window = NULL;
       t->_boundary = 0;
       t->_sgmap = NULL;
       t->_get_tag = irongate_dma_get_tag;
       t->_dmamap_create = isadma_bounce_dmamap_create;
       t->_dmamap_destroy = isadma_bounce_dmamap_destroy;
       t->_dmamap_load = isadma_bounce_dmamap_load;
       t->_dmamap_load_mbuf = isadma_bounce_dmamap_load_mbuf;
       t->_dmamap_load_uio = isadma_bounce_dmamap_load_uio;
       t->_dmamap_load_raw = isadma_bounce_dmamap_load_raw;
       t->_dmamap_unload = isadma_bounce_dmamap_unload;
       t->_dmamap_sync = isadma_bounce_dmamap_sync;

       t->_dmamem_alloc = isadma_bounce_dmamem_alloc;
       t->_dmamem_free = _bus_dmamem_free;
       t->_dmamem_map = _bus_dmamem_map;
       t->_dmamem_unmap = _bus_dmamem_unmap;
       t->_dmamem_mmap = _bus_dmamem_mmap;
}

/*
* Return the bus dma tag to be used for the specified bus type.
* INTERNAL USE ONLY!
*/
static bus_dma_tag_t
irongate_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype)
{
       struct irongate_config *icp = t->_cookie;

       switch (bustype) {
       case ALPHA_BUS_PCI:
       case ALPHA_BUS_EISA:
               /*
                * Busses capable of 32-bit DMA get the PCI DMA tag.
                */
               return (&icp->ic_dmat_pci);

       case ALPHA_BUS_ISA:
               /*
                * Lame 24-bit busses have to bounce.
                */
               return (&icp->ic_dmat_isa);

       default:
               panic("irongate_dma_get_tag: shouldn't be here, really...");
       }
}

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