/* $NetBSD: dwlpx_dma.c,v 1.30 2021/06/19 16:43:11 thorpej Exp $ */

/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe 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: dwlpx_dma.c,v 1.30 2021/06/19 16:43:11 thorpej Exp $");

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

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

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <alpha/tlsb/tlsbreg.h>
#include <alpha/tlsb/kftxxvar.h>
#include <alpha/tlsb/kftxxreg.h>
#include <alpha/pci/dwlpxreg.h>
#include <alpha/pci/dwlpxvar.h>

static bus_dma_tag_t dwlpx_dma_get_tag(bus_dma_tag_t, alpha_bus_t);

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

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

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

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

static void     dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);

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

/*
* SGMAP window A: 256M or 1G at 1G
*/
#define DWLPx_SG_MAPPED_BASE            (1*1024*1024*1024)
#define DWLPx_SG_MAPPED_SIZE(x)         ((x) * PAGE_SIZE)

/* DWLPx has a 256-byte out-bound DMA prefetch threshold. */
#define DWLPx_SG_MAPPED_PFTHRESH        256

/*
* Set this to always use SGMAPs.
*/
#ifdef DWLPX_ALWAYS_USE_SGMAP
int     dwlpx_always_use_sgmap = 1;
#else
int     dwlpx_always_use_sgmap = 0;
#endif

void
dwlpx_dma_init(struct dwlpx_config *ccp)
{
       char *exname;
       bus_dma_tag_t t;
       uint32_t *page_table;
       int i, lim, wmask;

       /*
        * Determine size of Window C based on the amount of SGMAP
        * page table SRAM available.
        */
       if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) {
               lim = 128 * 1024;
               wmask = PCIA_WMASK_1G;
       } else {
               lim = 32 * 1024;
               wmask = PCIA_WMASK_256M;
       }

       /*
        * Initialize the DMA tag used for direct-mapped DMA.  Chain
        * this window to the SGMAP window, because we might have
        * a lot of memory in the machine.
        */
       t = &ccp->cc_dmat_direct;
       t->_cookie = ccp;
       t->_wbase = DWLPx_DIRECT_MAPPED_BASE;
       t->_wsize = DWLPx_DIRECT_MAPPED_SIZE;
       t->_next_window = &ccp->cc_dmat_sgmap;
       t->_boundary = 0;
       t->_sgmap = NULL;
       t->_get_tag = dwlpx_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 DMA.
        */
       t = &ccp->cc_dmat_sgmap;
       t->_cookie = ccp;
       t->_wbase = DWLPx_SG_MAPPED_BASE;
       t->_wsize = DWLPx_SG_MAPPED_SIZE(lim);
       t->_next_window = NULL;
       t->_boundary = 0;
       t->_sgmap = &ccp->cc_sgmap;
       t->_pfthresh = DWLPx_SG_MAPPED_PFTHRESH;
       t->_get_tag = dwlpx_dma_get_tag;
       t->_dmamap_create = alpha_sgmap_dmamap_create;
       t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
       t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap;
       t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap;
       t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap;
       t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap;
       t->_dmamap_unload = dwlpx_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;

       /*
        * A few notes about SGMAP-mapped DMA on the DWLPx:
        *
        * The DWLPx has PCIA-resident SRAM that is used for
        * the SGMAP page table; there is no TLB.  The DWLPA
        * has room for 32K entries, yielding a total of 256M
        * of sgva space.  The DWLPB has 32K entries or 128K
        * entries, depending on TBIT, yielding either 256M or
        * 1G of sgva space.
        *
        * This sgva space must be shared across all windows
        * that wish to use SGMAP-mapped DMA; make sure to
        * adjust the "sgvabase" argument to alpha_sgmap_init()
        * accordingly if you create more than one SGMAP-mapped
        * window.  Note that sgvabase != window base.  The former
        * is used to compute indexes into the page table only.
        *
        * In the current implementation the first window is a
        * 2G window direct-mapped mapped at 2G and the second
        * window is disabled and the third window is a 256M
        * or 1GB scatter/gather map at 1GB.
        *
        * We just punt on trying to support ISA DMA.  If you want
        * try that on a TurboLaser, well, you just lose.
        */

       /*
        * Initialize the page table.
        */
       page_table =
           (uint32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase);
       for (i = 0; i < lim; i++)
               page_table[i * SGMAP_PTE_SPACING] = 0;
       alpha_mb();

       /*
        * Initialize the SGMAP for window C:
        *
        *      Size: 256M or 1GB
        *      Window base: 1GB
        *      SGVA base: 0
        */
       exname = kmem_asprintf("%s_sgmap_a",
           device_xname(ccp->cc_sc->dwlpx_dev));
       alpha_sgmap_init(t, &ccp->cc_sgmap, exname, DWLPx_SG_MAPPED_BASE,
           0, DWLPx_SG_MAPPED_SIZE(lim), sizeof(uint32_t),
           (void *)page_table, 0);

       /*
        * Set up DMA windows for this DWLPx.
        *
        * Do this even for all HPCs- even for the nonexistent
        * one on hose zero of a KFTIA.
        */
       for (i = 0; i < NHPC; i++) {
               REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_2G;
               REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0;
               REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) =
                   DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN;

               REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = 0;
               REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0;
               REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 0;

               REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = wmask;
               REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0;
               REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) =
                   DWLPx_SG_MAPPED_BASE | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN;
               alpha_mb();
       }
}

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

       switch (bustype) {
       case ALPHA_BUS_PCI:
       case ALPHA_BUS_EISA:
               if (dwlpx_always_use_sgmap) {
                       /*
                        * Always use SGMAPs (for testing purposes?)
                        */
                       return (&ccp->cc_dmat_sgmap);
               }
               /*
                * Give these busses the direct-mapped window; if the
                * address crosses the threshold, it will fall back
                * onto the SGMAP window.
                */
               return (&ccp->cc_dmat_direct);

       case ALPHA_BUS_ISA:
               /*
                * Don't even bother; it's not easy, given how the
                * page table is arranged, and it's not really worth
                * the trouble.
                */
               panic("dwlpx_dma_get_tag: ISA DMA?  Forget it...");
               /* NOTREACHED */

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

/*
* Load a DWLPx SGMAP-mapped DMA map with a linear buffer.
*/
static int
dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags)
{

       return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags,
           t->_sgmap));
}

/*
* Load a DWLPx SGMAP-mapped DMA map with an mbuf chain.
*/
static int
dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags)
{

       return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap));
}

/*
* Load a DWLPx SGMAP-mapped DMA map with a uio.
*/
static int
dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags)
{

       return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap));
}

/*
* Load a DWLPx SGMAP-mapped DMA map with raw memory.
*/
static int
dwlpx_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)
{

       return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags,
           t->_sgmap));
}

/*
* Unload a DWLPx DMA map.
*/
static void
dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map)
{

       /*
        * Invalidate any SGMAP page table entries used by this
        * mapping.
        */
       pci_sgmap_pte32_unload(t, map, t->_sgmap);

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

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