mac_dbdma.h (6339B)
1/* 2 * Copyright (c) 2009 Laurent Vivier 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a copy 5 * of this software and associated documentation files (the "Software"), to deal 6 * in the Software without restriction, including without limitation the rights 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 * copies of the Software, and to permit persons to whom the Software is 9 * furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 20 * THE SOFTWARE. 21 */ 22 23#ifndef HW_MAC_DBDMA_H 24#define HW_MAC_DBDMA_H 25 26#include "exec/memory.h" 27#include "qemu/iov.h" 28#include "sysemu/dma.h" 29#include "hw/sysbus.h" 30#include "qom/object.h" 31 32typedef struct DBDMA_io DBDMA_io; 33 34typedef void (*DBDMA_flush)(DBDMA_io *io); 35typedef void (*DBDMA_rw)(DBDMA_io *io); 36typedef void (*DBDMA_end)(DBDMA_io *io); 37struct DBDMA_io { 38 void *opaque; 39 void *channel; 40 hwaddr addr; 41 int len; 42 int is_last; 43 int is_dma_out; 44 DBDMA_end dma_end; 45 /* DMA is in progress, don't start another one */ 46 bool processing; 47 /* DMA request */ 48 void *dma_mem; 49 dma_addr_t dma_len; 50 DMADirection dir; 51}; 52 53/* 54 * DBDMA control/status registers. All little-endian. 55 */ 56 57#define DBDMA_CONTROL 0x00 58#define DBDMA_STATUS 0x01 59#define DBDMA_CMDPTR_HI 0x02 60#define DBDMA_CMDPTR_LO 0x03 61#define DBDMA_INTR_SEL 0x04 62#define DBDMA_BRANCH_SEL 0x05 63#define DBDMA_WAIT_SEL 0x06 64#define DBDMA_XFER_MODE 0x07 65#define DBDMA_DATA2PTR_HI 0x08 66#define DBDMA_DATA2PTR_LO 0x09 67#define DBDMA_RES1 0x0A 68#define DBDMA_ADDRESS_HI 0x0B 69#define DBDMA_BRANCH_ADDR_HI 0x0C 70#define DBDMA_RES2 0x0D 71#define DBDMA_RES3 0x0E 72#define DBDMA_RES4 0x0F 73 74#define DBDMA_REGS 16 75#define DBDMA_SIZE (DBDMA_REGS * sizeof(uint32_t)) 76 77#define DBDMA_CHANNEL_SHIFT 7 78#define DBDMA_CHANNEL_SIZE (1 << DBDMA_CHANNEL_SHIFT) 79 80#define DBDMA_CHANNELS (0x1000 >> DBDMA_CHANNEL_SHIFT) 81 82/* Bits in control and status registers */ 83 84#define RUN 0x8000 85#define PAUSE 0x4000 86#define FLUSH 0x2000 87#define WAKE 0x1000 88#define DEAD 0x0800 89#define ACTIVE 0x0400 90#define BT 0x0100 91#define DEVSTAT 0x00ff 92 93/* 94 * DBDMA command structure. These fields are all little-endian! 95 */ 96 97typedef struct dbdma_cmd { 98 uint16_t req_count; /* requested byte transfer count */ 99 uint16_t command; /* command word (has bit-fields) */ 100 uint32_t phy_addr; /* physical data address */ 101 uint32_t cmd_dep; /* command-dependent field */ 102 uint16_t res_count; /* residual count after completion */ 103 uint16_t xfer_status; /* transfer status */ 104} dbdma_cmd; 105 106/* DBDMA command values in command field */ 107 108#define COMMAND_MASK 0xf000 109#define OUTPUT_MORE 0x0000 /* transfer memory data to stream */ 110#define OUTPUT_LAST 0x1000 /* ditto followed by end marker */ 111#define INPUT_MORE 0x2000 /* transfer stream data to memory */ 112#define INPUT_LAST 0x3000 /* ditto, expect end marker */ 113#define STORE_WORD 0x4000 /* write word (4 bytes) to device reg */ 114#define LOAD_WORD 0x5000 /* read word (4 bytes) from device reg */ 115#define DBDMA_NOP 0x6000 /* do nothing */ 116#define DBDMA_STOP 0x7000 /* suspend processing */ 117 118/* Key values in command field */ 119 120#define KEY_MASK 0x0700 121#define KEY_STREAM0 0x0000 /* usual data stream */ 122#define KEY_STREAM1 0x0100 /* control/status stream */ 123#define KEY_STREAM2 0x0200 /* device-dependent stream */ 124#define KEY_STREAM3 0x0300 /* device-dependent stream */ 125#define KEY_STREAM4 0x0400 /* reserved */ 126#define KEY_REGS 0x0500 /* device register space */ 127#define KEY_SYSTEM 0x0600 /* system memory-mapped space */ 128#define KEY_DEVICE 0x0700 /* device memory-mapped space */ 129 130/* Interrupt control values in command field */ 131 132#define INTR_MASK 0x0030 133#define INTR_NEVER 0x0000 /* don't interrupt */ 134#define INTR_IFSET 0x0010 /* intr if condition bit is 1 */ 135#define INTR_IFCLR 0x0020 /* intr if condition bit is 0 */ 136#define INTR_ALWAYS 0x0030 /* always interrupt */ 137 138/* Branch control values in command field */ 139 140#define BR_MASK 0x000c 141#define BR_NEVER 0x0000 /* don't branch */ 142#define BR_IFSET 0x0004 /* branch if condition bit is 1 */ 143#define BR_IFCLR 0x0008 /* branch if condition bit is 0 */ 144#define BR_ALWAYS 0x000c /* always branch */ 145 146/* Wait control values in command field */ 147 148#define WAIT_MASK 0x0003 149#define WAIT_NEVER 0x0000 /* don't wait */ 150#define WAIT_IFSET 0x0001 /* wait if condition bit is 1 */ 151#define WAIT_IFCLR 0x0002 /* wait if condition bit is 0 */ 152#define WAIT_ALWAYS 0x0003 /* always wait */ 153 154typedef struct DBDMA_channel { 155 int channel; 156 uint32_t regs[DBDMA_REGS]; 157 qemu_irq irq; 158 DBDMA_io io; 159 DBDMA_rw rw; 160 DBDMA_flush flush; 161 dbdma_cmd current; 162} DBDMA_channel; 163 164struct DBDMAState { 165 SysBusDevice parent_obj; 166 167 MemoryRegion mem; 168 DBDMA_channel channels[DBDMA_CHANNELS]; 169 QEMUBH *bh; 170}; 171typedef struct DBDMAState DBDMAState; 172 173/* Externally callable functions */ 174 175void DBDMA_register_channel(void *dbdma, int nchan, qemu_irq irq, 176 DBDMA_rw rw, DBDMA_flush flush, 177 void *opaque); 178void DBDMA_kick(DBDMAState *dbdma); 179 180#define TYPE_MAC_DBDMA "mac-dbdma" 181OBJECT_DECLARE_SIMPLE_TYPE(DBDMAState, MAC_DBDMA) 182 183#endif