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

265 lines
6.3 KiB
C

/* $NetBSD: dma.c,v 1.8 2001/07/24 16:26:53 tsutsui Exp $ */
/* $OpenBSD: dma.c,v 1.5 1998/03/01 16:49:57 niklas Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* from: @(#)rz.c 8.1 (Berkeley) 7/29/93
*/
/*
* PICA system dma driver.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <uvm/uvm_extern.h>
#include <mips/locore.h>
#include <machine/cpu.h>
#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/pio.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <arc/jazz/pica.h>
#include <arc/jazz/rd94.h>
#include <arc/jazz/jazziovar.h>
#include <arc/jazz/jazzdmatlbreg.h>
#include <arc/jazz/jazzdmatlbvar.h>
#include <arc/jazz/dma.h>
void picaDmaReset __P((dma_softc_t *sc));
void picaDmaEnd __P((dma_softc_t *sc));
void picaDmaNull __P((dma_softc_t *sc));
/*
* Initialize the dma mapping register area and pool.
*/
void
picaDmaInit()
{
jazz_dmatlb_init(&jazzio_bus, jazzio_conf->jc_dmatlbreg);
}
/*
* Allocate an array of 'size' dma pte entrys.
* Return address to first pte.
*/
void
picaDmaTLBAlloc(dma_softc_t *dma)
{
dma->pte_base = jazz_dmatlb_alloc(dma->pte_size, 0, BUS_DMA_WAITOK,
&dma->dma_va);
}
/*
* Free an array of dma pte entrys.
*/
void
picaDmaTLBFree(dma_softc_t *dma)
{
jazz_dmatlb_free(dma->dma_va, dma->pte_size);
/*XXX Wakeup waiting */
}
/*
* Start local dma channel.
*/
void
picaDmaStart(sc, addr, size, datain)
struct dma_softc *sc;
char *addr;
size_t size;
int datain;
{
pDmaReg regs = sc->dma_reg;
vaddr_t va;
jazz_dma_pte_t *dma_pte;
/* Halt DMA */
regs->dma_enab = 0;
regs->dma_mode = 0;
/* Remap request space va into dma space va */
/* Map up the request viritual dma space */
va = jazz_dma_page_offs(addr);
dma_pte = sc->pte_base + (va / JAZZ_DMA_PAGE_SIZE);
jazz_dmatlb_map_va(NULL, (vaddr_t)addr, size, dma_pte);
jazz_dmatlb_flush();
/* Load new transfer parameters */
regs->dma_addr = sc->dma_va + va;
regs->dma_count = size;
regs->dma_mode = sc->mode & R4030_DMA_MODE;
sc->sc_active = 1;
if (datain == DMA_FROM_DEV) {
sc->mode &= ~DMA_DIR_WRITE;
regs->dma_enab = R4030_DMA_ENAB_RUN | R4030_DMA_ENAB_READ;
}
else {
sc->mode |= DMA_DIR_WRITE;
regs->dma_enab = R4030_DMA_ENAB_RUN | R4030_DMA_ENAB_WRITE;
}
wbflush();
}
/*
* Set up DMA mapper for external dma.
* Used by ISA dma and SONIC
*/
void
picaDmaMap(sc, addr, size, offset)
struct dma_softc *sc;
char *addr;
size_t size;
int offset;
{
vaddr_t va;
jazz_dma_pte_t *dma_pte;
/* Remap request space va into dma space va */
/* Map up the request viritual dma space */
va = jazz_dma_page_offs(addr) + offset;
dma_pte = sc->pte_base + (va / JAZZ_DMA_PAGE_SIZE);
jazz_dmatlb_map_va(NULL, (vaddr_t)addr, size, dma_pte);
}
/*
* Prepare for new dma by flushing
*/
void
picaDmaFlush(sc, addr, size, datain)
struct dma_softc *sc;
char *addr;
size_t size;
int datain;
{
jazz_dmatlb_flush();
}
/*
* Stop/Reset a DMA channel
*/
void
picaDmaReset(dma_softc_t *sc)
{
pDmaReg regs = sc->dma_reg;
/* Halt DMA */
regs->dma_enab = 0;
regs->dma_mode = 0;
sc->sc_active = 0;
}
/*
* End dma operation, return byte count left.
*/
void
picaDmaEnd(dma_softc_t *sc)
{
pDmaReg regs = sc->dma_reg;
/* Halt DMA */
regs->dma_count = 0;
regs->dma_enab = 0;
regs->dma_mode = 0;
sc->sc_active = 0;
}
/*
* Null call rathole!
*/
void
picaDmaNull(dma_softc_t *sc)
{
printf("picaDmaNull called\n");
}
/*
* dma_init..
* Called from asc to set up dma
*/
void
asc_dma_init(sc)
dma_softc_t *sc;
{
sc->reset = picaDmaReset;
sc->enintr = picaDmaNull;
sc->start = picaDmaStart;
sc->map = picaDmaMap;
sc->isintr = (int(*)(struct dma_softc *))picaDmaNull;
sc->intr = (int(*)(struct dma_softc *))picaDmaNull;
sc->end = picaDmaEnd;
sc->dma_reg = (pDmaReg)R4030_SYS_DMA0_REGS;
sc->pte_size = (MAXPHYS / JAZZ_DMA_PAGE_SIZE) + 1;
sc->mode = R4030_DMA_MODE_160NS | R4030_DMA_MODE_16;
picaDmaTLBAlloc(sc);
}
/*
* dma_init..
* Called from fdc to set up dma
*/
void
fdc_dma_init(dma_softc_t *sc)
{
sc->reset = picaDmaReset;
sc->enintr = picaDmaNull;
sc->start = picaDmaStart;
sc->map = picaDmaMap;
sc->isintr = (int(*)(struct dma_softc *))picaDmaNull;
sc->intr = (int(*)(struct dma_softc *))picaDmaNull;
sc->end = picaDmaEnd;
sc->dma_reg = (pDmaReg)jazzio_conf->jc_fdcdmareg;
sc->pte_size = (MAXPHYS / JAZZ_DMA_PAGE_SIZE) + 1;
sc->mode = R4030_DMA_MODE_160NS | R4030_DMA_MODE_8;
picaDmaTLBAlloc(sc);
}