/* $NetBSD: dma.h,v 1.2 1996/07/16 23:24:11 thorpej 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: @(#)dma.h 8.1 (Berkeley) 6/10/93 */ /* * The PICA system has four dma channels capable of scatter/gather * and full memory addressing. The maximum transfer length is 1Mb. * Dma snopes the L2 cache so no precaution is required. However * if L1 cache is cached 'write back' the processor is responible * for flushing/invalidating it. * * The dma mapper has up to 4096 page descriptors. */ #define PICA_TL_BASE 0xa0008000 /* Base of tl register area */ #define PICA_TL_SIZE 0x00008000 /* Size of tl register area */ /* * Hardware dma registers. */ typedef volatile struct { int dma_mode; int pad1; int dma_enab; int pad2; int dma_count; int pad3; vm_offset_t dma_addr; int pad4; } DmaReg, *pDmaReg; #define PICA_DMA_MODE_40NS 0x00 /* Device dma timing */ #define PICA_DMA_MODE_80NS 0x01 /* Device dma timing */ #define PICA_DMA_MODE_120NS 0x02 /* Device dma timing */ #define PICA_DMA_MODE_160NS 0x03 /* Device dma timing */ #define PICA_DMA_MODE_200NS 0x04 /* Device dma timing */ #define PICA_DMA_MODE_240NS 0x05 /* Device dma timing */ #define PICA_DMA_MODE_280NS 0x06 /* Device dma timing */ #define PICA_DMA_MODE_320NS 0x07 /* Device dma timing */ #define PICA_DMA_MODE_8 0x08 /* Device 8 bit */ #define PICA_DMA_MODE_16 0x10 /* Device 16 bit */ #define PICA_DMA_MODE_32 0x18 /* Device 32 bit */ #define PICA_DMA_MODE_INT 0x20 /* Interrupt when done */ #define PICA_DMA_MODE_BURST 0x40 /* Burst mode (Rev 2 only) */ #define PICA_DMA_MODE_FAST 0x80 /* Fast dma cycle (Rev 2 only) */ #define PICA_DMA_MODE 0xff /* Mode register bits */ #define DMA_DIR_WRITE 0x100 /* Software direction status */ #define DMA_DIR_READ 0x000 /* Software direction status */ #define PICA_DMA_ENAB_RUN 0x01 /* Enable dma */ #define PICA_DMA_ENAB_READ 0x00 /* Read from device */ #define PICA_DMA_ENAB_WRITE 0x02 /* Write to device */ #define PICA_DMA_ENAB_TC_IE 0x100 /* Terminal count int enable */ #define PICA_DMA_ENAB_ME_IE 0x200 /* Memory error int enable */ #define PICA_DMA_ENAB_TL_IE 0x400 /* Translation limit int enable */ #define PICA_DMA_COUNT_MASK 0x00fffff /* Byte count mask */ #define PICA_DMA_PAGE_NUM 0xffff000 /* Address page number */ #define PICA_DMA_PAGE_OFFS 0x0000fff /* Address page offset */ #define PICA_DMA_PAGE_SIZE 0x0001000 /* Address page size */ /* * Dma TLB entry */ typedef union dma_pte { struct { vm_offset_t lo_addr; /* Low part of translation addr */ vm_offset_t hi_addr; /* High part of translation addr */ } entry; struct bbb { union dma_pte *next; /* Next free translation entry */ int size; /* Number of consecutive free entrys */ } queue; } dma_pte_t; /* * Structure used to control dma. */ typedef struct dma_softc { struct device sc_dev; /* use as a device */ struct esp_softc *sc_esp; vm_offset_t dma_va; /* Viritual address for transfer */ int req_va; /* Original request va */ vm_offset_t next_va; /* Value to program into dma regs */ int next_size; /* Value to program into dma regs */ int mode; /* Mode register value and direction */ dma_pte_t *pte_base; /* Pointer to dma tlb array */ int pte_size; /* Size of pte allocated pte array */ pDmaReg dma_reg; /* Pointer to dma registers */ int sc_active; /* Active flag */ char **sc_dmaaddr; /* Pointer to dma address in dev */ int *sc_dmalen; /* Pointer to len counter in dev */ void (*reset)(struct dma_softc *); /* Reset routine pointer */ void (*enintr)(struct dma_softc *); /* Int enab routine pointer */ void (*map)(struct dma_softc *, caddr_t, size_t, int); /* Map a dma viritual area */ void (*start)(struct dma_softc *, caddr_t, size_t, int); /* Start routine pointer */ int (*isintr)(struct dma_softc *); /* Int check routine pointer */ int (*intr)(struct dma_softc *); /* Interrupt routine pointer */ int (*end)(struct dma_softc *); /* Interrupt routine pointer */ } dma_softc_t; #define DMA_TO_DEV 0 #define DMA_FROM_DEV 1 #define dma_page_offs(x) ((int)(x) & PICA_DMA_PAGE_OFFS) #define dma_page_round(x) (((int)(x) + PICA_DMA_PAGE_OFFS) & PICA_DMA_PAGE_NUM) #define DMA_RESET(r) ((r->reset)(r)) #define DMA_START(a, b, c, d) ((a->start)(a, b, c, d)) #define DMA_MAP(a, b, c, d) ((a->map)(a, b, c, d)) #define DMA_INTR(r) ((r->intr)(r)) #define DMA_DRAIN(r) #define DMA_END(r) ((r->end)(r))