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Annotation of Net2/arch/hp300/dev/dmareg.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)dmareg.h    7.3 (Berkeley) 5/7/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Hardware layout for the 98620[ABC]:
        !            38:  *     98620A (old 320s?):     byte/word DMA in up to 64K chunks
        !            39:  *     98620B (320s only):     98620A with programmable IPL
        !            40:  *     98620C (all others):    byte/word/longword DMA in up to 4Gb chunks
        !            41:  */
        !            42: #define v_char         volatile char
        !            43: #define        v_int           volatile int
        !            44: #define vu_char                volatile u_char
        !            45: #define vu_short       volatile u_short
        !            46: #define vu_int         volatile u_int
        !            47: 
        !            48: struct dmaBdevice {
        !            49:        v_char          *dmaB_addr;
        !            50:        vu_short        dmaB_count;
        !            51:        vu_short        dmaB_cmd;
        !            52: #define        dmaB_stat       dmaB_cmd
        !            53: };
        !            54: 
        !            55: struct dmadevice {
        !            56:        v_char          *dma_addr;
        !            57:        vu_int          dma_count;
        !            58:        vu_short        dma_cmd;
        !            59:        vu_short        dma_stat;
        !            60: };
        !            61: 
        !            62: struct dmareg {
        !            63:        struct dmaBdevice dma_Bchan0;
        !            64:        struct dmaBdevice dma_Bchan1;
        !            65: /* the rest are 98620C specific */
        !            66:        v_char            dma_id[4];
        !            67:        vu_char           dma_cr;
        !            68:        char              dma_pad1[0xEB];
        !            69:        struct dmadevice  dma_chan0;
        !            70:        char              dma_pad2[0xF4];
        !            71:        struct dmadevice  dma_chan1;
        !            72: };
        !            73: 
        !            74: #define        NDMA            2
        !            75: 
        !            76: /* intr level must be >= level of any device using dma.  i.e., splbio */
        !            77: #define        DMAINTLVL       5
        !            78: 
        !            79: /* addresses */
        !            80: #define        DMA_BASE        IIOV(0x500000)
        !            81: 
        !            82: /* command bits */
        !            83: #define        DMA_ENAB        0x0001
        !            84: #define        DMA_WORD        0x0002
        !            85: #define        DMA_WRT         0x0004
        !            86: #define        DMA_PRI         0x0008
        !            87: #define        DMA_IPL(x)      (((x) - 3) << 4)
        !            88: #define DMA_LWORD      0x0100
        !            89: #define DMA_START      0x8000
        !            90: 
        !            91: /* status bits */
        !            92: #define        DMA_ARMED       0x01
        !            93: #define        DMA_INTR        0x02
        !            94: #define DMA_ACC                0x04
        !            95: #define DMA_HALT       0x08
        !            96: #define DMA_BERR       0x10
        !            97: #define DMA_ALIGN      0x20
        !            98: #define DMA_WRAP       0x40
        !            99: 
        !           100: #ifdef KERNEL
        !           101: /*
        !           102:  * Macros to attempt to hide the HW differences between the 98620B DMA
        !           103:  * board and the 1TQ4-0401 DMA chip (68020C "board").  The latter
        !           104:  * includes emulation registers for the former but you need to access
        !           105:  * the "native-mode" registers directly in order to do 32-bit DMA.
        !           106:  *
        !           107:  * DMA_CLEAR:  Clear interrupt on DMA board.  We just use the
        !           108:  *             emulation registers on the 98620C as that is easiest.
        !           109:  * DMA_STAT:   Read status register.  Again, we always read the
        !           110:  *             emulation register.  Someday we might want to
        !           111:  *             look at the 98620C status to get the extended bits.
        !           112:  * DMA_ARM:    Load address, count and kick-off DMA.
        !           113:  */
        !           114: #define        DMA_CLEAR(dc)   { v_int dmaclr = (int)dc->sc_Bhwaddr->dmaB_addr; }
        !           115: #define        DMA_STAT(dc)    dc->sc_Bhwaddr->dmaB_stat
        !           116: 
        !           117: #if defined(HP320)
        !           118: #define        DMA_ARM(dc)     \
        !           119:        if (dc->sc_type == DMA_B) { \
        !           120:                register struct dmaBdevice *dma = dc->sc_Bhwaddr; \
        !           121:                dma->dmaB_addr = dc->sc_cur->dc_addr; \
        !           122:                dma->dmaB_count = dc->sc_cur->dc_count - 1; \
        !           123:                dma->dmaB_cmd = dc->sc_cmd; \
        !           124:        } else { \
        !           125:                register struct dmadevice *dma = dc->sc_hwaddr; \
        !           126:                dma->dma_addr = dc->sc_cur->dc_addr; \
        !           127:                dma->dma_count = dc->sc_cur->dc_count - 1; \
        !           128:                dma->dma_cmd = dc->sc_cmd; \
        !           129:        }
        !           130: #else
        !           131: #define        DMA_ARM(dc)     \
        !           132:        { \
        !           133:                register struct dmadevice *dma = dc->sc_hwaddr; \
        !           134:                dma->dma_addr = dc->sc_cur->dc_addr; \
        !           135:                dma->dma_count = dc->sc_cur->dc_count - 1; \
        !           136:                dma->dma_cmd = dc->sc_cmd; \
        !           137:        }
        !           138: #endif
        !           139: #endif

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