285 lines
6.7 KiB
C
285 lines
6.7 KiB
C
/* $NetBSD: dma.c,v 1.7 2001/06/13 15:11:38 soda Exp $ */
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/* $OpenBSD: dma.c,v 1.5 1998/03/01 16:49:57 niklas Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)rz.c 8.1 (Berkeley) 7/29/93
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*/
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/*
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* PICA system dma driver.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/syslog.h>
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#include <sys/device.h>
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#include <uvm/uvm_extern.h>
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#include <mips/locore.h>
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#include <machine/cpu.h>
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#include <machine/autoconf.h>
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#include <machine/bus.h>
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#include <machine/pio.h>
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#include <dev/scsipi/scsi_all.h>
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#include <dev/scsipi/scsipi_all.h>
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#include <dev/scsipi/scsiconf.h>
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#include <arc/jazz/pica.h>
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#include <arc/jazz/rd94.h>
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#include <arc/jazz/jazziovar.h>
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#include <arc/jazz/jazzdmatlbreg.h>
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#include <arc/jazz/jazzdmatlbvar.h>
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#include <arc/jazz/dma.h>
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void picaDmaReset __P((dma_softc_t *sc));
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void picaDmaEnd __P((dma_softc_t *sc));
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void picaDmaNull __P((dma_softc_t *sc));
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/*
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* Initialize the dma mapping register area and pool.
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*/
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void
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picaDmaInit()
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{
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jazz_dmatlb_init(&jazzio_bus, jazzio_conf->jc_dmatlbreg);
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}
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/*
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* Allocate an array of 'size' dma pte entrys.
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* Return address to first pte.
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*/
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void
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picaDmaTLBAlloc(dma_softc_t *dma)
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{
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dma->pte_base = jazz_dmatlb_alloc(dma->pte_size, 0, BUS_DMA_WAITOK,
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&dma->dma_va);
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}
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/*
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* Free an array of dma pte entrys.
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*/
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void
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picaDmaTLBFree(dma_softc_t *dma)
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{
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jazz_dmatlb_free(dma->dma_va, dma->pte_size);
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/*XXX Wakeup waiting */
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}
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/*
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* Start local dma channel.
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*/
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void
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picaDmaStart(sc, addr, size, datain)
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struct dma_softc *sc;
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char *addr;
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size_t size;
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int datain;
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{
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pDmaReg regs = sc->dma_reg;
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vaddr_t va;
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jazz_dma_pte_t *dma_pte;
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/* Halt DMA */
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regs->dma_enab = 0;
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regs->dma_mode = 0;
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/* Remap request space va into dma space va */
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/* Map up the request viritual dma space */
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va = jazz_dma_page_offs(addr);
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dma_pte = sc->pte_base + (va / JAZZ_DMA_PAGE_SIZE);
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jazz_dmatlb_map_va(NULL, (vaddr_t)addr, size, dma_pte);
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jazz_dmatlb_flush();
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/* Load new transfer parameters */
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regs->dma_addr = sc->dma_va + va;
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regs->dma_count = size;
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regs->dma_mode = sc->mode & R4030_DMA_MODE;
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sc->sc_active = 1;
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if (datain == DMA_FROM_DEV) {
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sc->mode &= ~DMA_DIR_WRITE;
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regs->dma_enab = R4030_DMA_ENAB_RUN | R4030_DMA_ENAB_READ;
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}
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else {
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sc->mode |= DMA_DIR_WRITE;
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regs->dma_enab = R4030_DMA_ENAB_RUN | R4030_DMA_ENAB_WRITE;
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}
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wbflush();
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}
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/*
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* Set up DMA mapper for external dma.
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* Used by ISA dma and SONIC
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*/
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void
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picaDmaMap(sc, addr, size, offset)
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struct dma_softc *sc;
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char *addr;
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size_t size;
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int offset;
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{
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vaddr_t va;
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jazz_dma_pte_t *dma_pte;
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/* Remap request space va into dma space va */
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/* Map up the request viritual dma space */
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va = jazz_dma_page_offs(addr) + offset;
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dma_pte = sc->pte_base + (va / JAZZ_DMA_PAGE_SIZE);
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jazz_dmatlb_map_va(NULL, (vaddr_t)addr, size, dma_pte);
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}
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/*
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* Prepare for new dma by flushing
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*/
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void
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picaDmaFlush(sc, addr, size, datain)
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struct dma_softc *sc;
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char *addr;
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size_t size;
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int datain;
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{
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jazz_dmatlb_flush();
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}
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/*
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* Stop/Reset a DMA channel
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*/
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void
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picaDmaReset(dma_softc_t *sc)
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{
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pDmaReg regs = sc->dma_reg;
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/* Halt DMA */
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regs->dma_enab = 0;
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regs->dma_mode = 0;
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sc->sc_active = 0;
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}
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/*
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* End dma operation, return byte count left.
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*/
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void
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picaDmaEnd(dma_softc_t *sc)
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{
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pDmaReg regs = sc->dma_reg;
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/* Halt DMA */
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regs->dma_count = 0;
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regs->dma_enab = 0;
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regs->dma_mode = 0;
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sc->sc_active = 0;
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}
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/*
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* Null call rathole!
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*/
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void
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picaDmaNull(dma_softc_t *sc)
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{
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printf("picaDmaNull called\n");
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}
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/*
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* dma_init..
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* Called from asc to set up dma
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*/
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void
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asc_dma_init(sc)
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dma_softc_t *sc;
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{
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sc->reset = picaDmaReset;
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sc->enintr = picaDmaNull;
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sc->start = picaDmaStart;
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sc->map = picaDmaMap;
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sc->isintr = (int(*)(struct dma_softc *))picaDmaNull;
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sc->intr = (int(*)(struct dma_softc *))picaDmaNull;
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sc->end = picaDmaEnd;
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sc->dma_reg = (pDmaReg)R4030_SYS_DMA0_REGS;
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sc->pte_size = (MAXPHYS / JAZZ_DMA_PAGE_SIZE) + 1;
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sc->mode = R4030_DMA_MODE_160NS | R4030_DMA_MODE_16;
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picaDmaTLBAlloc(sc);
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}
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/*
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* dma_init..
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* Called from fdc to set up dma
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*/
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void
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fdc_dma_init(dma_softc_t *sc)
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{
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sc->reset = picaDmaReset;
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sc->enintr = picaDmaNull;
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sc->start = picaDmaStart;
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sc->map = picaDmaMap;
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sc->isintr = (int(*)(struct dma_softc *))picaDmaNull;
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sc->intr = (int(*)(struct dma_softc *))picaDmaNull;
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sc->end = picaDmaEnd;
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sc->dma_reg = (pDmaReg)jazzio_conf->jc_fdcdmareg;
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sc->pte_size = (MAXPHYS / JAZZ_DMA_PAGE_SIZE) + 1;
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sc->mode = R4030_DMA_MODE_160NS | R4030_DMA_MODE_8;
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picaDmaTLBAlloc(sc);
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}
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/*
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* dma_init..
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* Called from sonic to set up dma
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*/
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void
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sn_dma_init(dma_softc_t *sc, int pages)
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{
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sc->reset = picaDmaNull;
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sc->enintr = picaDmaNull;
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sc->start = picaDmaFlush;
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sc->map = picaDmaMap;
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sc->isintr = (int(*)(struct dma_softc *))picaDmaNull;
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sc->intr = (int(*)(struct dma_softc *))picaDmaNull;
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sc->end = picaDmaNull;
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sc->dma_reg = (pDmaReg)NULL;
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sc->pte_size = pages;
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sc->mode = 0;
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picaDmaTLBAlloc(sc);
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}
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