Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/arch/alpha/pci/cia_dma.c

477 lines
12 KiB
C
Raw Blame History

/* $NetBSD: cia_dma.c,v 1.2 1997/06/06 23:59:24 thorpej Exp $ */
/*-
* Copyright (c) 1997 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 <machine/options.h> /* Config options headers */
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: cia_dma.c,v 1.2 1997/06/06 23:59:24 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <vm/vm.h>
#define _ALPHA_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <alpha/pci/ciareg.h>
#include <alpha/pci/ciavar.h>
bus_dma_tag_t cia_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t));
int cia_bus_dmamap_create_sgmap __P((bus_dma_tag_t, bus_size_t, int,
bus_size_t, bus_size_t, int, bus_dmamap_t *));
void cia_bus_dmamap_destroy_sgmap __P((bus_dma_tag_t, bus_dmamap_t));
int cia_bus_dmamap_load_direct __P((bus_dma_tag_t, bus_dmamap_t, void *,
bus_size_t, struct proc *, int));
int cia_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *,
bus_size_t, struct proc *, int));
int cia_bus_dmamap_load_mbuf_direct __P((bus_dma_tag_t, bus_dmamap_t,
struct mbuf *, int));
int cia_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t,
struct mbuf *, int));
int cia_bus_dmamap_load_uio_direct __P((bus_dma_tag_t, bus_dmamap_t,
struct uio *, int));
int cia_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t,
struct uio *, int));
int cia_bus_dmamap_load_raw_direct __P((bus_dma_tag_t, bus_dmamap_t,
bus_dma_segment_t *, int, bus_size_t, int));
int cia_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t,
bus_dma_segment_t *, int, bus_size_t, int));
void cia_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t));
/*
* The direct-mapped DMA window begins at this PCI address.
*/
#define CIA_DIRECT_MAPPED_BASE 0x40000000
/*
* The 8M SGMAP-mapped DMA window begins at this PCI address.
*/
#define CIA_SGMAP_MAPPED_BASE (8*1024*1024)
/*
* Macro to flush CIA scatter/gather TLB.
*/
#define CIA_TLB_INVALIDATE() \
do { \
alpha_mb(); \
REGVAL(CIA_PCI_TBIA) = CIA_PCI_TBIA_ALL; \
alpha_mb(); \
} while (0)
void
cia_dma_init(ccp)
struct cia_config *ccp;
{
bus_addr_t tbase;
u_int32_t memcs_en;
bus_dma_tag_t t;
/*
* Initialize the DMA tag used for direct-mapped DMA.
*/
t = &ccp->cc_dmat_direct;
t->_cookie = ccp;
t->_get_tag = cia_dma_get_tag;
t->_dmamap_create = _bus_dmamap_create;
t->_dmamap_destroy = _bus_dmamap_destroy;
t->_dmamap_load = cia_bus_dmamap_load_direct;
t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_direct;
t->_dmamap_load_uio = cia_bus_dmamap_load_uio_direct;
t->_dmamap_load_raw = cia_bus_dmamap_load_raw_direct;
t->_dmamap_unload = _bus_dmamap_unload;
t->_dmamap_sync = NULL; /* Nothing to do. */
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->_get_tag = cia_dma_get_tag;
t->_dmamap_create = cia_bus_dmamap_create_sgmap;
t->_dmamap_destroy = cia_bus_dmamap_destroy_sgmap;
t->_dmamap_load = cia_bus_dmamap_load_sgmap;
t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_sgmap;
t->_dmamap_load_uio = cia_bus_dmamap_load_uio_sgmap;
t->_dmamap_load_raw = cia_bus_dmamap_load_raw_sgmap;
t->_dmamap_unload = cia_bus_dmamap_unload_sgmap;
t->_dmamap_sync = NULL; /* Nothing to do. */
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;
/*
* The firmware has set up window 1 as a 1G direct-mapped DMA
* window beginning at 1G. We leave it alone. Leave window
* 0 alone until we reconfigure it for SGMAP-mapped DMA.
* Windows 2 and 3 are already disabled.
*/
/*
* Initialize the SGMAP if safe to do so.
*/
if (ccp->cc_mallocsafe) {
alpha_sgmap_init(t, &ccp->cc_sgmap, "cia_sgmap",
CIA_SGMAP_MAPPED_BASE, 0, (8*1024*1024),
sizeof(u_int64_t), NULL);
/* Remember the MEMCS value. */
alpha_mb();
memcs_en = REGVAL(CIA_PCI_W0BASE) & CIA_PCI_WnBASE_MEMCS_EN;
/* Now disable window 0. */
REGVAL(CIA_PCI_W0BASE) = 0;
alpha_mb();
/*
* Set up window 0 as an 8MB SGMAP-mapped window
* starting at 8MB.
*/
tbase = ccp->cc_sgmap.aps_ptpa >> CIA_PCI_TnBASE_SHIFT;
if ((tbase & CIA_PCI_TnBASE_MASK) != tbase)
panic("cia_dma_init: bad page table address");
REGVAL(CIA_PCI_T0BASE) = tbase;
REGVAL(CIA_PCI_W0MASK) = CIA_PCI_WnMASK_8M;
alpha_mb();
REGVAL(CIA_PCI_W0BASE) = CIA_SGMAP_MAPPED_BASE |
CIA_PCI_WnBASE_SG_EN | CIA_PCI_WnBASE_W_EN | memcs_en;
alpha_mb();
CIA_TLB_INVALIDATE();
}
/* XXX XXX BEGIN XXX XXX */
{ /* XXX */
extern vm_offset_t alpha_XXX_dmamap_or; /* XXX */
alpha_XXX_dmamap_or = CIA_DIRECT_MAPPED_BASE; /* XXX */
} /* XXX */
/* XXX XXX END XXX XXX */
}
/*
* Return the bus dma tag to be used for the specified bus type.
* INTERNAL USE ONLY!
*/
bus_dma_tag_t
cia_dma_get_tag(t, bustype)
bus_dma_tag_t t;
alpha_bus_t bustype;
{
struct cia_config *ccp = t->_cookie;
switch (bustype) {
case ALPHA_BUS_PCI:
case ALPHA_BUS_EISA:
/*
* Systems with a CIA can only support 1G
* of memory, so we use the direct-mapped window
* on busses that have 32-bit DMA.
*/
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_sgmap);
default:
panic("cia_dma_get_tag: shouldn't be here, really...");
}
}
/*
* Create a CIA SGMAP-mapped DMA map.
*/
int
cia_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary,
flags, dmamp)
bus_dma_tag_t t;
bus_size_t size;
int nsegments;
bus_size_t maxsegsz;
bus_size_t boundary;
int flags;
bus_dmamap_t *dmamp;
{
struct cia_config *ccp = t->_cookie;
struct alpha_sgmap_cookie *a;
bus_dmamap_t map;
int error;
error = _bus_dmamap_create(t, size, nsegments, maxsegsz,
boundary, flags, dmamp);
if (error)
return (error);
map = *dmamp;
a = malloc(sizeof(struct alpha_sgmap_cookie), M_DEVBUF,
(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK);
if (a == NULL) {
_bus_dmamap_destroy(t, map);
return (ENOMEM);
}
bzero(a, sizeof(struct alpha_sgmap_cookie));
map->_dm_sgcookie = a;
if (flags & BUS_DMA_ALLOCNOW) {
error = alpha_sgmap_alloc(map, round_page(size),
&ccp->cc_sgmap, flags);
if (error)
cia_bus_dmamap_destroy_sgmap(t, map);
}
return (error);
}
/*
* Destroy a CIA SGMAP-mapped DMA map.
*/
void
cia_bus_dmamap_destroy_sgmap(t, map)
bus_dma_tag_t t;
bus_dmamap_t map;
{
struct cia_config *ccp = t->_cookie;
struct alpha_sgmap_cookie *a = map->_dm_sgcookie;
if (a->apdc_flags & APDC_HAS_SGMAP)
alpha_sgmap_free(&ccp->cc_sgmap, a);
free(a, M_DEVBUF);
_bus_dmamap_destroy(t, map);
}
/*
* Load a CIA direct-mapped DMA map with a linear buffer.
*/
int
cia_bus_dmamap_load_direct(t, map, buf, buflen, p, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
void *buf;
bus_size_t buflen;
struct proc *p;
int flags;
{
return (_bus_dmamap_load_direct_common(t, map, buf, buflen, p,
flags, CIA_DIRECT_MAPPED_BASE));
}
/*
* Load a CIA SGMAP-mapped DMA map with a linear buffer.
*/
int
cia_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
void *buf;
bus_size_t buflen;
struct proc *p;
int flags;
{
struct cia_config *ccp = t->_cookie;
int error;
error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags,
&ccp->cc_sgmap);
if (error == 0)
CIA_TLB_INVALIDATE();
return (error);
}
/*
* Load a CIA direct-mapped DMA map with an mbuf chain.
*/
int
cia_bus_dmamap_load_mbuf_direct(t, map, m, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
struct mbuf *m;
int flags;
{
return (_bus_dmamap_load_mbuf_direct_common(t, map, m,
flags, CIA_DIRECT_MAPPED_BASE));
}
/*
* Load a CIA SGMAP-mapped DMA map with an mbuf chain.
*/
int
cia_bus_dmamap_load_mbuf_sgmap(t, map, m, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
struct mbuf *m;
int flags;
{
struct cia_config *ccp = t->_cookie;
int error;
error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, &ccp->cc_sgmap);
if (error == 0)
CIA_TLB_INVALIDATE();
return (error);
}
/*
* Load a CIA direct-mapped DMA map with a uio.
*/
int
cia_bus_dmamap_load_uio_direct(t, map, uio, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
struct uio *uio;
int flags;
{
return (_bus_dmamap_load_uio_direct_common(t, map, uio,
flags, CIA_DIRECT_MAPPED_BASE));
}
/*
* Load a CIA SGMAP-mapped DMA map with a uio.
*/
int
cia_bus_dmamap_load_uio_sgmap(t, map, uio, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
struct uio *uio;
int flags;
{
struct cia_config *ccp = t->_cookie;
int error;
error = pci_sgmap_pte64_load_uio(t, map, uio, flags, &ccp->cc_sgmap);
if (error == 0)
CIA_TLB_INVALIDATE();
return (error);
}
/*
* Load a CIA direct-mapped DMA map with raw memory.
*/
int
cia_bus_dmamap_load_raw_direct(t, map, segs, nsegs, size, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
bus_dma_segment_t *segs;
int nsegs;
bus_size_t size;
int flags;
{
return (_bus_dmamap_load_raw_direct_common(t, map, segs, nsegs,
size, flags, CIA_DIRECT_MAPPED_BASE));
}
/*
* Load a CIA SGMAP-mapped DMA map with raw memory.
*/
int
cia_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
bus_dma_segment_t *segs;
int nsegs;
bus_size_t size;
int flags;
{
struct cia_config *ccp = t->_cookie;
int error;
error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags,
&ccp->cc_sgmap);
if (error == 0)
CIA_TLB_INVALIDATE();
return (error);
}
/*
* Unload a CIA DMA map.
*/
void
cia_bus_dmamap_unload_sgmap(t, map)
bus_dma_tag_t t;
bus_dmamap_t map;
{
struct cia_config *ccp = t->_cookie;
/*
* Invalidate any SGMAP page table entries used by this
* mapping.
*/
pci_sgmap_pte64_unload(t, map, &ccp->cc_sgmap);
CIA_TLB_INVALIDATE();
/*
* Do the generic bits of the unload.
*/
_bus_dmamap_unload(t, map);
}
Reference in New Issue View Git Blame Copy Permalink