/* $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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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); }