/* $NetBSD: mcpcia_dma.c,v 1.26 2021/07/04 22:42:36 thorpej Exp $ */

/*-
* Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe and Matthew Jacob of the Numerical Aerospace Simulation
* Facility, NASA Ames Research Center.
*
* 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.
*/

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

__KERNEL_RCSID(0, "$NetBSD: mcpcia_dma.c,v 1.26 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/mcpciareg.h>
#include <alpha/pci/mcpciavar.h>

static bus_dma_tag_t mcpcia_dma_get_tag(bus_dma_tag_t, alpha_bus_t);

static int      mcpcia_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t,
                   void *, bus_size_t, struct proc *, int);

static int      mcpcia_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
                   struct mbuf *, int);

static int      mcpcia_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
                   struct uio *, int);

static int      mcpcia_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t,
                   bus_dma_segment_t *, int, bus_size_t, int);

static void     mcpcia_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);

/*
* Direct-mapped window: 2G at 2G
*/
#define MCPCIA_DIRECT_MAPPED_BASE       (2UL*1024UL*1024UL*1024UL)
#define MCPCIA_DIRECT_MAPPED_SIZE       (2UL*1024UL*1024UL*1024UL)

/*
* SGMAP window for PCI: 1G at 1G
*/
#define MCPCIA_PCI_SG_MAPPED_BASE       (1UL*1024UL*1024UL*1024UL)
#define MCPCIA_PCI_SG_MAPPED_SIZE       (1UL*1024UL*1024UL*1024UL)

/*
* SGMAP window for ISA: 8M at 8M
*/
#define MCPCIA_ISA_SG_MAPPED_BASE       (8*1024*1024)
#define MCPCIA_ISA_SG_MAPPED_SIZE       (8*1024*1024)

/* MCPCIA has a 256-byte out-bound DMA prefetch threshold. */
#define MCPCIA_SG_MAPPED_PFTHRESH       256

#define MCPCIA_SGTLB_INVALIDATE(ccp)                                    \
do {                                                                    \
       alpha_mb();                                                     \
       REGVAL(MCPCIA_SG_TBIA(ccp)) = 0xdeadbeef;                       \
       alpha_mb();                                                     \
} while (0)

void
mcpcia_dma_init(struct mcpcia_config *ccp)
{
       bus_dma_tag_t t;

       /*
        * Initialize the DMA tag used for direct-mapped DMA.
        */
       t = &ccp->cc_dmat_direct;
       t->_cookie = ccp;
       t->_wbase = MCPCIA_DIRECT_MAPPED_BASE;
       t->_wsize = MCPCIA_DIRECT_MAPPED_SIZE;
       t->_next_window = &ccp->cc_dmat_pci_sgmap;
       t->_boundary = 0;
       t->_sgmap = NULL;
       t->_get_tag = mcpcia_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 sgmap-mapped PCI DMA.
        */
       t = &ccp->cc_dmat_pci_sgmap;
       t->_cookie = ccp;
       t->_wbase = MCPCIA_PCI_SG_MAPPED_BASE;
       t->_wsize = MCPCIA_PCI_SG_MAPPED_SIZE;
       t->_next_window = NULL;
       t->_boundary = 0;
       t->_sgmap = &ccp->cc_pci_sgmap;
       t->_pfthresh = MCPCIA_SG_MAPPED_PFTHRESH;
       t->_get_tag = mcpcia_dma_get_tag;
       t->_dmamap_create = alpha_sgmap_dmamap_create;
       t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
       t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap;
       t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap;
       t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap;
       t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap;
       t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap;
       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 sgmap-mapped ISA DMA.
        */
       t = &ccp->cc_dmat_isa_sgmap;
       t->_cookie = ccp;
       t->_wbase = MCPCIA_ISA_SG_MAPPED_BASE;
       t->_wsize = MCPCIA_ISA_SG_MAPPED_SIZE;
       t->_next_window = NULL;
       t->_boundary = 0;
       t->_sgmap = &ccp->cc_isa_sgmap;
       t->_pfthresh = MCPCIA_SG_MAPPED_PFTHRESH;
       t->_get_tag = mcpcia_dma_get_tag;
       t->_dmamap_create = alpha_sgmap_dmamap_create;
       t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
       t->_dmamap_load = mcpcia_bus_dmamap_load_sgmap;
       t->_dmamap_load_mbuf = mcpcia_bus_dmamap_load_mbuf_sgmap;
       t->_dmamap_load_uio = mcpcia_bus_dmamap_load_uio_sgmap;
       t->_dmamap_load_raw = mcpcia_bus_dmamap_load_raw_sgmap;
       t->_dmamap_unload = mcpcia_bus_dmamap_unload_sgmap;
       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 SGMAPs.
        */
       alpha_sgmap_init(&ccp->cc_dmat_pci_sgmap, &ccp->cc_pci_sgmap,
           "mcpcia pci sgmap",
           MCPCIA_PCI_SG_MAPPED_BASE, 0, MCPCIA_PCI_SG_MAPPED_SIZE,
           sizeof(uint64_t), NULL, 0);

       alpha_sgmap_init(&ccp->cc_dmat_isa_sgmap, &ccp->cc_isa_sgmap,
           "mcpcia isa sgmap",
           MCPCIA_ISA_SG_MAPPED_BASE, 0, MCPCIA_ISA_SG_MAPPED_SIZE,
           sizeof(uint64_t), NULL, 0);

       /*
        * Disable windows first.
        */

       REGVAL(MCPCIA_W0_BASE(ccp)) = 0;
       REGVAL(MCPCIA_W1_BASE(ccp)) = 0;
       REGVAL(MCPCIA_W2_BASE(ccp)) = 0;
       REGVAL(MCPCIA_W3_BASE(ccp)) = 0;
       REGVAL(MCPCIA_T0_BASE(ccp)) = 0;
       REGVAL(MCPCIA_T1_BASE(ccp)) = 0;
       REGVAL(MCPCIA_T2_BASE(ccp)) = 0;
       REGVAL(MCPCIA_T3_BASE(ccp)) = 0;
       alpha_mb();

       /*
        * Set up window 0 as an 8MB SGMAP-mapped window starting at 8MB.
        */
       REGVAL(MCPCIA_W0_MASK(ccp)) = MCPCIA_WMASK_8M;
       REGVAL(MCPCIA_T0_BASE(ccp)) =
               ccp->cc_isa_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT;
       alpha_mb();
       REGVAL(MCPCIA_W0_BASE(ccp)) =
               MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_ISA_SG_MAPPED_BASE;
       alpha_mb();

       MCPCIA_SGTLB_INVALIDATE(ccp);

       /*
        * Set up window 1 as a 2 GB Direct-mapped window starting at 2GB.
        */

       REGVAL(MCPCIA_W1_MASK(ccp)) = MCPCIA_WMASK_2G;
       REGVAL(MCPCIA_T1_BASE(ccp)) = 0;
       alpha_mb();
       REGVAL(MCPCIA_W1_BASE(ccp)) =
               MCPCIA_DIRECT_MAPPED_BASE | MCPCIA_WBASE_EN;
       alpha_mb();

       /*
        * Set up window 2 as a 1G SGMAP-mapped window starting at 1G.
        */

       REGVAL(MCPCIA_W2_MASK(ccp)) = MCPCIA_WMASK_1G;
       REGVAL(MCPCIA_T2_BASE(ccp)) =
               ccp->cc_pci_sgmap.aps_ptpa >> MCPCIA_TBASEX_SHIFT;
       alpha_mb();
       REGVAL(MCPCIA_W2_BASE(ccp)) =
               MCPCIA_WBASE_EN | MCPCIA_WBASE_SG | MCPCIA_PCI_SG_MAPPED_BASE;
       alpha_mb();
}

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

       switch (bustype) {
       case ALPHA_BUS_PCI:
       case ALPHA_BUS_EISA:
               /*
                * Start off using the direct-mapped window.  We will
                * automatically fall backed onto the chained PCI SGMAP
                * window if necessary.
                */
               return (&ccp->cc_dmat_direct);

       case ALPHA_BUS_ISA:
               /*
                * ISA doesn't have enough address bits to use
                * the direct-mapped DMA window, so we must use
                * SGMAPs.
                */
               return (&ccp->cc_dmat_isa_sgmap);

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

/*
* Load a MCPCIA SGMAP-mapped DMA map with a linear buffer.
*/
static int
mcpcia_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags)
{
       int error;
       struct mcpcia_config *ccp = t->_cookie;

       error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags,
           t->_sgmap);
       if (error == 0)
               MCPCIA_SGTLB_INVALIDATE(ccp);
       return (error);
}

/*
* Load a MCPCIA SGMAP-mapped DMA map with an mbuf chain.
*/
static int
mcpcia_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags)
{
       int error;
       struct mcpcia_config *ccp = t->_cookie;

       error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap);
       if (error == 0)
               MCPCIA_SGTLB_INVALIDATE(ccp);
       return (error);
}

/*
* Load a MCPCIA SGMAP-mapped DMA map with a uio.
*/
static int
mcpcia_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags)
{
       int error;
       struct mcpcia_config *ccp = t->_cookie;

       error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap);
       if (error == 0)
               MCPCIA_SGTLB_INVALIDATE(ccp);
       return (error);
}

/*
* Load a MCPCIA SGMAP-mapped DMA map with raw memory.
*/
static int
mcpcia_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags)
{
       int error;
       struct mcpcia_config *ccp = t->_cookie;

       error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags,
           t->_sgmap);
       if (error == 0)
               MCPCIA_SGTLB_INVALIDATE(ccp);
       return (error);
}

/*
* Unload a MCPCIA DMA map.
*/
static void
mcpcia_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
{
       struct mcpcia_config *ccp = t->_cookie;

       /*
        * Invalidate any SGMAP page table entries used by this mapping.
        */
       pci_sgmap_pte64_unload(t, map, t->_sgmap);
       MCPCIA_SGTLB_INVALIDATE(ccp);

       /*
        * Do the generic bits of the unload.
        */
       _bus_dmamap_unload_common(t, map);
}

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