Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powermac/dbdma.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008 Nathan Whitehorn 5 * All rights reserved 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 #include <sys/endian.h> 38 #include <sys/bus.h> 39 #include <machine/bus.h> 40 #include <machine/dbdma.h> 41 #include <sys/rman.h> 42 43 #include "dbdmavar.h" 44 45 static MALLOC_DEFINE(M_DBDMA, "dbdma", "DBDMA Command List"); 46 47 static uint32_t dbdma_read_reg(dbdma_channel_t *, u_int); 48 static void dbdma_write_reg(dbdma_channel_t *, u_int, uint32_t); 49 static void dbdma_phys_callback(void *, bus_dma_segment_t *, int, int); 50 51 static void 52 dbdma_phys_callback(void *chan, bus_dma_segment_t *segs, int nsegs, int error) 53 { 54 dbdma_channel_t *channel = (dbdma_channel_t *)(chan); 55 56 channel->sc_slots_pa = segs[0].ds_addr; 57 dbdma_write_reg(channel, CHAN_CMDPTR, channel->sc_slots_pa); 58 } 59 60 int 61 dbdma_allocate_channel(struct resource *dbdma_regs, u_int offset, 62 bus_dma_tag_t parent_dma, int slots, dbdma_channel_t **chan) 63 { 64 int error = 0; 65 dbdma_channel_t *channel; 66 67 channel = *chan = malloc(sizeof(struct dbdma_channel), M_DBDMA, 68 M_WAITOK | M_ZERO); 69 70 channel->sc_regs = dbdma_regs; 71 channel->sc_off = offset; 72 dbdma_stop(channel); 73 74 channel->sc_slots_pa = 0; 75 76 error = bus_dma_tag_create(parent_dma, 16, 0, BUS_SPACE_MAXADDR_32BIT, 77 BUS_SPACE_MAXADDR, NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE, 0, NULL, 78 NULL, &(channel->sc_dmatag)); 79 80 error = bus_dmamem_alloc(channel->sc_dmatag, 81 (void **)&channel->sc_slots, BUS_DMA_WAITOK | BUS_DMA_ZERO, 82 &channel->sc_dmamap); 83 84 error = bus_dmamap_load(channel->sc_dmatag, channel->sc_dmamap, 85 channel->sc_slots, PAGE_SIZE, dbdma_phys_callback, channel, 0); 86 87 dbdma_write_reg(channel, CHAN_CMDPTR_HI, 0); 88 89 channel->sc_nslots = slots; 90 91 return (error); 92 } 93 94 int 95 dbdma_resize_channel(dbdma_channel_t *chan, int newslots) 96 { 97 98 if (newslots > (PAGE_SIZE / sizeof(struct dbdma_command))) 99 return (-1); 100 101 chan->sc_nslots = newslots; 102 return (0); 103 } 104 105 int 106 dbdma_free_channel(dbdma_channel_t *chan) 107 { 108 109 dbdma_stop(chan); 110 111 bus_dmamem_free(chan->sc_dmatag, chan->sc_slots, chan->sc_dmamap); 112 bus_dma_tag_destroy(chan->sc_dmatag); 113 114 free(chan, M_DBDMA); 115 116 return (0); 117 } 118 119 uint16_t 120 dbdma_get_cmd_status(dbdma_channel_t *chan, int slot) 121 { 122 123 bus_dmamap_sync(chan->sc_dmatag, chan->sc_dmamap, BUS_DMASYNC_POSTREAD); 124 125 /* 126 * I really did mean to swap resCount and xferStatus here, to 127 * account for the quad-word little endian fields. 128 */ 129 return (le16toh(chan->sc_slots[slot].resCount)); 130 } 131 132 void 133 dbdma_clear_cmd_status(dbdma_channel_t *chan, int slot) 134 { 135 /* See endian note above */ 136 chan->sc_slots[slot].resCount = 0; 137 } 138 139 uint16_t 140 dbdma_get_residuals(dbdma_channel_t *chan, int slot) 141 { 142 143 bus_dmamap_sync(chan->sc_dmatag, chan->sc_dmamap, BUS_DMASYNC_POSTREAD); 144 145 return (le16toh(chan->sc_slots[slot].xferStatus)); 146 } 147 148 void 149 dbdma_reset(dbdma_channel_t *chan) 150 { 151 152 dbdma_stop(chan); 153 dbdma_set_current_cmd(chan, 0); 154 dbdma_run(chan); 155 } 156 157 void 158 dbdma_run(dbdma_channel_t *chan) 159 { 160 uint32_t control_reg; 161 162 control_reg = DBDMA_STATUS_RUN | DBDMA_STATUS_PAUSE | 163 DBDMA_STATUS_WAKE | DBDMA_STATUS_DEAD; 164 control_reg <<= DBDMA_REG_MASK_SHIFT; 165 166 control_reg |= DBDMA_STATUS_RUN; 167 dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg); 168 } 169 170 void 171 dbdma_pause(dbdma_channel_t *chan) 172 { 173 uint32_t control_reg; 174 175 control_reg = DBDMA_STATUS_PAUSE; 176 control_reg <<= DBDMA_REG_MASK_SHIFT; 177 178 control_reg |= DBDMA_STATUS_PAUSE; 179 dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg); 180 } 181 182 void 183 dbdma_wake(dbdma_channel_t *chan) 184 { 185 uint32_t control_reg; 186 187 control_reg = DBDMA_STATUS_WAKE | DBDMA_STATUS_PAUSE | 188 DBDMA_STATUS_RUN | DBDMA_STATUS_DEAD; 189 control_reg <<= DBDMA_REG_MASK_SHIFT; 190 191 control_reg |= DBDMA_STATUS_WAKE | DBDMA_STATUS_RUN; 192 dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg); 193 } 194 195 void 196 dbdma_stop(dbdma_channel_t *chan) 197 { 198 uint32_t control_reg; 199 200 control_reg = DBDMA_STATUS_RUN; 201 control_reg <<= DBDMA_REG_MASK_SHIFT; 202 203 dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg); 204 205 while (dbdma_read_reg(chan, CHAN_STATUS_REG) & DBDMA_STATUS_ACTIVE) 206 DELAY(5); 207 } 208 209 void 210 dbdma_set_current_cmd(dbdma_channel_t *chan, int slot) 211 { 212 uint32_t cmd; 213 214 cmd = chan->sc_slots_pa + slot * sizeof(struct dbdma_command); 215 dbdma_write_reg(chan, CHAN_CMDPTR, cmd); 216 } 217 218 uint16_t 219 dbdma_get_chan_status(dbdma_channel_t *chan) 220 { 221 uint32_t status_reg; 222 223 status_reg = dbdma_read_reg(chan, CHAN_STATUS_REG); 224 return (status_reg & 0x0000ffff); 225 } 226 227 uint8_t 228 dbdma_get_device_status(dbdma_channel_t *chan) 229 { 230 return (dbdma_get_chan_status(chan) & 0x00ff); 231 } 232 233 void 234 dbdma_set_device_status(dbdma_channel_t *chan, uint8_t mask, uint8_t value) 235 { 236 uint32_t control_reg; 237 238 control_reg = mask; 239 control_reg <<= DBDMA_REG_MASK_SHIFT; 240 control_reg |= value; 241 242 dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg); 243 } 244 245 void 246 dbdma_set_interrupt_selector(dbdma_channel_t *chan, uint8_t mask, uint8_t val) 247 { 248 uint32_t intr_select; 249 250 intr_select = mask; 251 intr_select <<= DBDMA_REG_MASK_SHIFT; 252 253 intr_select |= val; 254 dbdma_write_reg(chan, CHAN_INTR_SELECT, intr_select); 255 } 256 257 void 258 dbdma_set_branch_selector(dbdma_channel_t *chan, uint8_t mask, uint8_t val) 259 { 260 uint32_t br_select; 261 262 br_select = mask; 263 br_select <<= DBDMA_REG_MASK_SHIFT; 264 265 br_select |= val; 266 dbdma_write_reg(chan, CHAN_BRANCH_SELECT, br_select); 267 } 268 269 void 270 dbdma_set_wait_selector(dbdma_channel_t *chan, uint8_t mask, uint8_t val) 271 { 272 uint32_t wait_select; 273 274 wait_select = mask; 275 wait_select <<= DBDMA_REG_MASK_SHIFT; 276 wait_select |= val; 277 dbdma_write_reg(chan, CHAN_WAIT_SELECT, wait_select); 278 } 279 280 void 281 dbdma_insert_command(dbdma_channel_t *chan, int slot, int command, int stream, 282 bus_addr_t data, size_t count, uint8_t interrupt, uint8_t branch, 283 uint8_t wait, uint32_t branch_slot) 284 { 285 struct dbdma_command cmd; 286 uint32_t *flip; 287 288 cmd.cmd = command; 289 cmd.key = stream; 290 cmd.intr = interrupt; 291 cmd.branch = branch; 292 cmd.wait = wait; 293 294 cmd.reqCount = count; 295 cmd.address = (uint32_t)(data); 296 if (command != DBDMA_STORE_QUAD && command != DBDMA_LOAD_QUAD) 297 cmd.cmdDep = chan->sc_slots_pa + 298 branch_slot * sizeof(struct dbdma_command); 299 else 300 cmd.cmdDep = branch_slot; 301 302 cmd.resCount = 0; 303 cmd.xferStatus = 0; 304 305 /* 306 * Move quadwords to little-endian. God only knows why 307 * Apple thought this was a good idea. 308 */ 309 flip = (uint32_t *)(&cmd); 310 flip[0] = htole32(flip[0]); 311 flip[1] = htole32(flip[1]); 312 flip[2] = htole32(flip[2]); 313 314 chan->sc_slots[slot] = cmd; 315 } 316 317 void 318 dbdma_insert_stop(dbdma_channel_t *chan, int slot) 319 { 320 321 dbdma_insert_command(chan, slot, DBDMA_STOP, 0, 0, 0, DBDMA_NEVER, 322 DBDMA_NEVER, DBDMA_NEVER, 0); 323 } 324 325 void 326 dbdma_insert_nop(dbdma_channel_t *chan, int slot) 327 { 328 329 dbdma_insert_command(chan, slot, DBDMA_NOP, 0, 0, 0, DBDMA_NEVER, 330 DBDMA_NEVER, DBDMA_NEVER, 0); 331 } 332 333 void 334 dbdma_insert_branch(dbdma_channel_t *chan, int slot, int to_slot) 335 { 336 337 dbdma_insert_command(chan, slot, DBDMA_NOP, 0, 0, 0, DBDMA_NEVER, 338 DBDMA_ALWAYS, DBDMA_NEVER, to_slot); 339 } 340 341 void 342 dbdma_sync_commands(dbdma_channel_t *chan, bus_dmasync_op_t op) 343 { 344 345 bus_dmamap_sync(chan->sc_dmatag, chan->sc_dmamap, op); 346 } 347 348 void 349 dbdma_save_state(dbdma_channel_t *chan) 350 { 351 352 chan->sc_saved_regs[0] = dbdma_read_reg(chan, CHAN_CMDPTR); 353 chan->sc_saved_regs[1] = dbdma_read_reg(chan, CHAN_CMDPTR_HI); 354 chan->sc_saved_regs[2] = dbdma_read_reg(chan, CHAN_INTR_SELECT); 355 chan->sc_saved_regs[3] = dbdma_read_reg(chan, CHAN_BRANCH_SELECT); 356 chan->sc_saved_regs[4] = dbdma_read_reg(chan, CHAN_WAIT_SELECT); 357 358 dbdma_stop(chan); 359 } 360 361 void 362 dbdma_restore_state(dbdma_channel_t *chan) 363 { 364 365 dbdma_wake(chan); 366 dbdma_write_reg(chan, CHAN_CMDPTR, chan->sc_saved_regs[0]); 367 dbdma_write_reg(chan, CHAN_CMDPTR_HI, chan->sc_saved_regs[1]); 368 dbdma_write_reg(chan, CHAN_INTR_SELECT, chan->sc_saved_regs[2]); 369 dbdma_write_reg(chan, CHAN_BRANCH_SELECT, chan->sc_saved_regs[3]); 370 dbdma_write_reg(chan, CHAN_WAIT_SELECT, chan->sc_saved_regs[4]); 371 } 372 373 static uint32_t 374 dbdma_read_reg(dbdma_channel_t *chan, u_int offset) 375 { 376 377 return (bus_read_4(chan->sc_regs, chan->sc_off + offset)); 378 } 379 380 static void 381 dbdma_write_reg(dbdma_channel_t *chan, u_int offset, uint32_t val) 382 { 383 384 bus_write_4(chan->sc_regs, chan->sc_off + offset, val); 385 }
Cache object: 3fb56750b842f8f6366398b5e32c32df
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