NetBSD/sys/arch/arc/jazz/jazzdmatlb.c

201 lines
5.0 KiB
C

/* $NetBSD: jazzdmatlb.c,v 1.4 2000/12/24 09:25:29 ur Exp $ */
/* $OpenBSD: dma.c,v 1.5 1998/03/01 16:49:57 niklas Exp $ */
/*-
* Copyright (C) 2000 Shuichiro URATA. All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* Jazz derived system dma driver. Handles resource allocation and
* logical (virtual) address remaping.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/extent.h>
#include <sys/device.h>
#include <uvm/uvm_extern.h>
#include <machine/autoconf.h>
#include <machine/bus.h>
#include <arc/jazz/jazzdmatlbreg.h>
#include <arc/jazz/jazzdmatlbvar.h>
extern paddr_t kvtophys __P((vaddr_t)); /* XXX */
/*
* Currently, only NET and BIO devices use DMA, and splnet > splbio.
*/
#define spldma() splnet()
#define NDMATLB (JAZZ_DMATLB_SIZE / sizeof(jazz_dma_pte_t))
static bus_space_tag_t dmatlb_iot;
static bus_space_handle_t dmatlb_ioh;
static struct extent *dmatlbmap;
static jazz_dma_pte_t *dma_tlb;
/*
* Initialize the dma mapping register area and pool.
*/
void
jazz_dmatlb_init(iot, ioaddr)
bus_space_tag_t iot;
bus_addr_t ioaddr;
{
int err;
dmatlb_iot = iot;
err = bus_space_map(iot, ioaddr, JAZZ_DMATLB_REGSIZE, 0, &dmatlb_ioh);
if (err != 0)
panic("jazz_dmatlb_init: cannot map 0x%lx\n", ioaddr);
dma_tlb = (jazz_dma_pte_t *)PICA_TL_BASE;
mips3_FlushCache(); /* Make sure no map entries are cached */
bzero((char *)dma_tlb, JAZZ_DMATLB_SIZE);
dmatlbmap = extent_create("dmatlb", 0, NDMATLB, M_DEVBUF, NULL, NULL,
EX_NOWAIT);
if (dmatlbmap == NULL)
panic("jazz_dmatlb_init: cannot create extent map");
bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_MAP,
MIPS_KSEG1_TO_PHYS(dma_tlb));
bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_LIMIT,
JAZZ_DMATLB_SIZE);
jazz_dmatlb_flush();
}
/*
* Allocate an array of 'size' DMA PTEs.
* Return address to first pte.
*/
jazz_dma_pte_t *
jazz_dmatlb_alloc(npte, boundary, flags, addr)
int npte;
bus_size_t boundary;
int flags;
bus_addr_t *addr;
{
u_long start;
int err;
int s;
s = spldma();
err = extent_alloc(dmatlbmap, npte, 1, boundary / JAZZ_DMA_PAGE_SIZE,
(flags & BUS_DMA_WAITOK) ? (EX_WAITSPACE | EX_WAITOK) : EX_NOWAIT,
&start);
splx(s);
if (err)
return (NULL);
*addr = start * JAZZ_DMA_PAGE_SIZE;
return (dma_tlb + start);
}
/*
* Free an array of DMA PTEs.
*/
void
jazz_dmatlb_free(addr, npte)
bus_addr_t addr;
int npte;
{
u_long start;
int s;
start = addr / JAZZ_DMA_PAGE_SIZE;
s = spldma();
extent_free(dmatlbmap, start, npte, EX_NOWAIT);
splx(s);
}
/*
* Map up a virtual address space in dma space given by
* the dma control structure.
*/
void
jazz_dmatlb_map_va(p, va, size, dma_pte)
struct proc *p;
vaddr_t va;
vsize_t size;
jazz_dma_pte_t *dma_pte;
{
paddr_t pa;
size = jazz_dma_page_round(size + jazz_dma_page_offs(va));
va &= JAZZ_DMA_PAGE_NUM;
while (size > 0) {
if (p != NULL)
(void)pmap_extract(p->p_vmspace->vm_map.pmap, va, &pa);
else
pa = kvtophys(va);
pa &= JAZZ_DMA_PAGE_NUM;
dma_pte->lo_addr = pa;
dma_pte->hi_addr = 0;
dma_pte++;
va += JAZZ_DMA_PAGE_SIZE;
size -= JAZZ_DMA_PAGE_SIZE;
}
}
/*
* Map up a physical address space in dma space given by
* the dma control structure.
*/
void
jazz_dmatlb_map_pa(pa, size, dma_pte)
paddr_t pa;
psize_t size;
jazz_dma_pte_t *dma_pte;
{
size = jazz_dma_page_round(size + jazz_dma_page_offs(pa));
pa &= JAZZ_DMA_PAGE_NUM;
while (size > 0) {
dma_pte->lo_addr = pa;
dma_pte->hi_addr = 0;
dma_pte++;
pa += JAZZ_DMA_PAGE_SIZE;
size -= JAZZ_DMA_PAGE_SIZE;
}
}
/*
* Prepare for new dma by flushing
*/
void
jazz_dmatlb_flush()
{
bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_IVALID, 0);
}