1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright 2014 Garrett D'Amore <garrett@damore.org> 25 */ 26 27 /* 28 * Copyright 1998 Sun Microsystems, Inc. All rights reserved. 29 * Use is subject to license terms. 30 */ 31 32 /* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */ 33 /* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */ 34 /* All Rights Reserved */ 35 36 /* Copyright (c) 1988, 1989 Intel Corp. */ 37 /* All Rights Reserved */ 38 39 #ifndef _SYS_DMAENGINE_H 40 #define _SYS_DMAENGINE_H 41 42 #include <sys/types.h> 43 #include <sys/dditypes.h> 44 45 #ifdef __cplusplus 46 extern "C" { 47 #endif 48 49 #define NCHANS 8 50 51 /* 52 * the DMA Engine Request structure 53 */ 54 struct ddi_dmae_req { 55 dev_info_t *der_rdip; /* original requester's dev_info_t */ 56 uchar_t der_command; /* Read/Write/Translate/Verify */ 57 uchar_t der_bufprocess; /* NoAuto_init/Chain/Auto_init */ 58 uchar_t der_step; /* Inc / Dec / Hold */ 59 uchar_t der_trans; /* Single/Demand/Block/Cascade */ 60 uchar_t der_path; /* 8/16/32 */ 61 uchar_t der_cycles; /* 1 or 2 */ 62 uchar_t der_dest; /* Memory / IO */ 63 uchar_t der_arbus; /* MicroChannel arbitration reg */ 64 ushort_t der_ioadr; /* MicroChannel i/o address reg */ 65 ddi_dma_cookie_t *(*proc)(); /* address of application call routine */ 66 void *procparms; /* parameter buffer for appl call */ 67 }; 68 69 #define DMAE_CMD_VRFY 0 70 #define DMAE_CMD_WRITE 1 /* from memory to device */ 71 #define DMAE_CMD_READ 2 /* from device to memory */ 72 #define DMAE_CMD_TRAN 3 73 74 #define DMAE_BUF_NOAUTO 0 /* default */ 75 #define DMAE_BUF_CHAIN 0x1 76 #define DMAE_BUF_AUTO 0x2 77 78 #define DMAE_STEP_INC 0 /* default */ 79 #define DMAE_STEP_DEC 1 80 #define DMAE_STEP_HOLD 2 81 82 #define DMAE_TRANS_SNGL 0 /* default */ 83 #define DMAE_TRANS_BLCK 1 84 #define DMAE_TRANS_DMND 2 85 #define DMAE_TRANS_CSCD 3 86 87 88 /* 89 * For the EISA bus 90 */ 91 #define DMAE_PATH_DEF 0 /* default to ISA xfer width */ 92 #define DMAE_PATH_8 1 /* ISA default for chnl 0..3 */ 93 #define DMAE_PATH_16 2 /* ISA default for chnl 5..7 */ 94 #define DMAE_PATH_32 3 95 #define DMAE_PATH_64 4 96 #define DMAE_PATH_16B 5 /* 16-bit path but byte count */ 97 98 #define DMAE_CYCLES_1 0 /* Compatible timing */ 99 #define DMAE_CYCLES_2 1 /* Type "A" timing */ 100 #define DMAE_CYCLES_3 2 /* Type "B" timing */ 101 #define DMAE_CYCLES_4 3 /* Burst timing */ 102 103 #define DMAE_DEST_IO 0 /* default */ 104 #define DMAE_DEST_MEM 1 105 106 107 108 /* public function routines */ 109 extern int i_dmae_init(dev_info_t *); 110 extern ddi_dma_cookie_t *_dmae_nxcookie(int); 111 extern int i_dmae_acquire(dev_info_t *, int, int (*)(), caddr_t); 112 extern int i_dmae_free(dev_info_t *, int); 113 extern int i_dmae_prog(dev_info_t *, struct ddi_dmae_req *, 114 ddi_dma_cookie_t *, int); 115 extern int i_dmae_swsetup(dev_info_t *, struct ddi_dmae_req *, 116 ddi_dma_cookie_t *, int); 117 extern void i_dmae_swstart(dev_info_t *, int); 118 extern void i_dmae_stop(dev_info_t *, int); 119 extern void i_dmae_enable(dev_info_t *, int); 120 extern void i_dmae_disable(dev_info_t *, int); 121 extern void i_dmae_get_chan_stat(dev_info_t *dip, int chnl, 122 ulong_t *addressp, int *countp); 123 124 /* 125 * the DMA Channel Block structure 126 */ 127 struct dmae_chnl { 128 ksema_t dch_lock; /* semaphore for this channel */ 129 ddi_dma_cookie_t *dch_cookiep; /* current dma mapping cookie */ 130 ddi_dma_cookie_t *(*proc)(); /* address of application call */ 131 /* routine */ 132 void *procparms; /* parameter buffer for appl call */ 133 }; 134 135 136 /* 137 * DMA Engine DDI functions 138 */ 139 140 /* 141 * Get DMA engine attributes 142 * 143 * The attributes of the DMA engine of the parent bus-nexus are copied into 144 * the provided structure. This should be called at driver attach time, 145 * rather than for each DMA bind. 146 */ 147 148 int ddi_dmae_getattr(dev_info_t *dip, ddi_dma_attr_t *attrp); 149 150 /* 151 * DMA channel allocation 152 * 153 * The allocation function must be called prior to any other DMA engine 154 * function on a channel. The channel should be freed after completion of the 155 * DMA / device operation if the channel is to be shared. 156 * 157 * Specifics of arguments to ddi_dmae_alloc: 158 * 159 * dip - dev_info pointer, which identifies the base device that wishes 160 * to use the DMA channel. 161 * 162 * chnl - a DMA channel number. 163 * 164 * dmae_waitfp - wait/callback_function pointer, which operates in the same 165 * manner as in ddi_dma_setup(). The value DDI_DMA_DONTWAIT will cause an 166 * immediate return if the channel cannot be acquired. The value 167 * DDI_DMA_SLEEP will will cause the thread to sleep and not return until 168 * the channel has been acquired. Any other value is assumed to be a 169 * callback function address. 170 * 171 * When resources might be available, the callback function is called 172 * (with the argument specified in arg) from interrupt context. 173 * 174 * When the callback function dmae_waitfp() is called, it should attempt to 175 * allocate the DMA channel again. If it succeeds or does not need the 176 * channel any more, it must return the value DDI_DMA_CALLBACK_DONE. 177 * If it does not want to allocate the channel, but instead wishes to be 178 * called back again later, it must return the value DDI_DMA_CALLBACK_LATER. 179 * If it tries to allocate the channel, but fails to do so, it must return the 180 * value DDI_DMA_CALLBACK_RUNOUT. 181 * 182 * Failure to observe this protocol will have unpredictable results. 183 * 184 * The callback function must provide its own data structure integrity 185 * when it is invoked. 186 */ 187 188 int ddi_dmae_alloc(dev_info_t *dip, int chnl, int (*dmae_waitfp)(), 189 caddr_t arg); 190 191 /* 192 * DMA channel deallocation 193 * 194 * The deallocation function should be called after completion of the 195 * DMA / device operation if the channel is to be shared. 196 */ 197 198 int ddi_dmae_release(dev_info_t *dip, int chnl); 199 200 /* 201 * DMA channel used in 1st party DMA scheme 202 * 203 * The specified channel will be configured to operate in a "slave" mode 204 * to a first_party DMA engine that also uses the channel. 205 */ 206 207 int ddi_dmae_1stparty(dev_info_t *dip, int chnl); 208 209 /* 210 * Program DMA channel 211 * 212 * The DMA channel is setup for an operation using ddi_dmae_prog(). 213 * This function is implemented to access all capabilities of the DMA engine 214 * hardware. This function disables the channel prior to setup, and enables 215 * the channel before returning. 216 * 217 * Specifics of arguments to ddi_dmae_prog: 218 * 219 * dmaereqp - pointer to a DMA engine request structure. This structure 220 * is implementation specific and contains all the info necessary to 221 * setup the channel, except for the memory address and count. 222 * This structure is implemented with default values equal to zero, 223 * so that normally only der_command has to be set with a read or write 224 * command value. Once the channel has been setup, subsequent calls to 225 * ddi_dmae_prog() can have dmaereqp set to NULL if only the address and 226 * count have to be updated. 227 * 228 * cookiep - pointer to a ddi_dma_cookie object which contains address, 229 * count and intermediate memory mapping information. 230 */ 231 232 int ddi_dmae_prog(dev_info_t *dip, struct ddi_dmae_req *dmaereqp, 233 ddi_dma_cookie_t *cookiep, int chnl); 234 235 int ddi_dmae_swsetup(dev_info_t *dip, struct ddi_dmae_req *dmaereqp, 236 ddi_dma_cookie_t *cookiep, int chnl); 237 238 int ddi_dmae_swstart(dev_info_t *dip, int chnl); 239 240 /* 241 * Stop DMA channel 242 * 243 * The DMA channel is disabled and any active operation is terminated. 244 */ 245 246 int ddi_dmae_stop(dev_info_t *dip, int chnl); 247 248 /* 249 * Enable DMA channel 250 * 251 * The DMA channel is enabled for operation. The channel is also enabled 252 * after successful setup in ddi_dmae_prog(). 253 */ 254 255 int ddi_dmae_enable(dev_info_t *dip, int chnl); 256 257 /* 258 * Disable DMA channel 259 * 260 * The DMA channel is disabled so that transfers cannot continue. 261 */ 262 263 int ddi_dmae_disable(dev_info_t *dip, int chnl); 264 265 /* 266 * Get remaining xfer count 267 * 268 * The count register of the DMA channel is read. The channel is assumed 269 * to be stopped. 270 */ 271 272 int ddi_dmae_getcnt(dev_info_t *dip, int chnl, int *count); 273 274 #ifdef __cplusplus 275 } 276 #endif 277 278 #endif /* !_SYS_DMAENGINE_H */ 279