projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 60f56dfc KM |
1 | /* |
| 2 | * Copyright (c) 1982, 1990 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * %sccs.include.redist.c% | |
| 6 | * | |
| 7 | * @(#)dmareg.h 7.1 (Berkeley) %G% | |
| 8 | */ | |
| 9 | ||
| 10 | /* | |
| 11 | * Hardware layout for the 98620[ABC]: | |
| 12 | * 98620A (old 320s?): byte/word DMA in up to 64K chunks | |
| 13 | * 98620B (320s only): 98620A with programmable IPL | |
| 14 | * 98620C (all others): byte/word/longword DMA in up to 4Gb chunks | |
| 15 | */ | |
| 16 | #define v_char volatile char | |
| 17 | #define v_int volatile int | |
| 18 | #define vu_char volatile u_char | |
| 19 | #define vu_short volatile u_short | |
| 20 | #define vu_int volatile u_int | |
| 21 | ||
| 22 | struct dmaBdevice { | |
| 23 | v_char *dmaB_addr; | |
| 24 | vu_short dmaB_count; | |
| 25 | vu_short dmaB_cmd; | |
| 26 | #define dmaB_stat dmaB_cmd | |
| 27 | }; | |
| 28 | ||
| 29 | struct dmadevice { | |
| 30 | v_char *dma_addr; | |
| 31 | vu_int dma_count; | |
| 32 | vu_short dma_cmd; | |
| 33 | vu_short dma_stat; | |
| 34 | }; | |
| 35 | ||
| 36 | struct dmareg { | |
| 37 | struct dmaBdevice dma_Bchan0; | |
| 38 | struct dmaBdevice dma_Bchan1; | |
| 39 | /* the rest are 98620C specific */ | |
| 40 | v_char dma_id[4]; | |
| 41 | vu_char dma_cr; | |
| 42 | char dma_pad1[0xEB]; | |
| 43 | struct dmadevice dma_chan0; | |
| 44 | char dma_pad2[0xF4]; | |
| 45 | struct dmadevice dma_chan1; | |
| 46 | }; | |
| 47 | ||
| 48 | #define NDMA 2 | |
| 49 | ||
| 50 | /* intr level must be >= level of any device using dma. i.e., splbio */ | |
| 51 | #define DMAINTLVL 5 | |
| 52 | ||
| 53 | /* addresses */ | |
| 54 | #define DMA_BASE IOV(0x500000) | |
| 55 | ||
| 56 | /* command bits */ | |
| 57 | #define DMA_ENAB 0x0001 | |
| 58 | #define DMA_WORD 0x0002 | |
| 59 | #define DMA_WRT 0x0004 | |
| 60 | #define DMA_PRI 0x0008 | |
| 61 | #define DMA_IPL(x) (((x) - 3) << 4) | |
| 62 | #define DMA_LWORD 0x0100 | |
| 63 | #define DMA_START 0x8000 | |
| 64 | ||
| 65 | /* status bits */ | |
| 66 | #define DMA_ARMED 0x01 | |
| 67 | #define DMA_INTR 0x02 | |
| 68 | #define DMA_ACC 0x04 | |
| 69 | #define DMA_HALT 0x08 | |
| 70 | #define DMA_BERR 0x10 | |
| 71 | #define DMA_ALIGN 0x20 | |
| 72 | #define DMA_WRAP 0x40 | |
| 73 | ||
| 74 | #ifdef KERNEL | |
| 75 | /* | |
| 76 | * Macros to attempt to hide the HW differences between the 98620B DMA | |
| 77 | * board and the 1TQ4-0401 DMA chip (68020C "board"). The latter | |
| 78 | * includes emulation registers for the former but you need to access | |
| 79 | * the "native-mode" registers directly in order to do 32-bit DMA. | |
| 80 | * | |
| 81 | * DMA_CLEAR: Clear interrupt on DMA board. We just use the | |
| 82 | * emulation registers on the 98620C as that is easiest. | |
| 83 | * DMA_STAT: Read status register. Again, we always read the | |
| 84 | * emulation register. Someday we might want to | |
| 85 | * look at the 98620C status to get the extended bits. | |
| 86 | * DMA_ARM: Load address, count and kick-off DMA. | |
| 87 | */ | |
| 88 | #define DMA_CLEAR(dc) { v_int dmaclr = (int)dc->sc_Bhwaddr->dmaB_addr; } | |
| 89 | #define DMA_STAT(dc) dc->sc_Bhwaddr->dmaB_stat | |
| 90 | ||
| 91 | #if defined(HP320) | |
| 92 | #define DMA_ARM(dc, ix) \ | |
| 93 | if (dc->sc_type == DMA_B) { \ | |
| 94 | register struct dmaBdevice *dma = dc->sc_Bhwaddr; \ | |
| 95 | dma->dmaB_addr = dc->sc_addr[ix]; \ | |
| 96 | dma->dmaB_count = dc->sc_count[ix] - 1; \ | |
| 97 | dma->dmaB_cmd = dc->sc_cmd; \ | |
| 98 | } else { \ | |
| 99 | register struct dmadevice *dma = dc->sc_hwaddr; \ | |
| 100 | dma->dma_addr = dc->sc_addr[ix]; \ | |
| 101 | dma->dma_count = dc->sc_count[ix] - 1; \ | |
| 102 | dma->dma_cmd = dc->sc_cmd; \ | |
| 103 | } | |
| 104 | #else | |
| 105 | #define DMA_ARM(dc, ix) \ | |
| 106 | { \ | |
| 107 | register struct dmadevice *dma = dc->sc_hwaddr; \ | |
| 108 | dma->dma_addr = dc->sc_addr[ix]; \ | |
| 109 | dma->dma_count = dc->sc_count[ix] - 1; \ | |
| 110 | dma->dma_cmd = dc->sc_cmd; \ | |
| 111 | } | |
| 112 | #endif | |
| 113 | #endif |