1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // drivers/dma/imx-sdma.c 4 // 5 // This file contains a driver for the Freescale Smart DMA engine 6 // 7 // Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> 8 // 9 // Based on code from Freescale: 10 // 11 // Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved. 12 13 #include <linux/init.h> 14 #include <linux/iopoll.h> 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/bitops.h> 18 #include <linux/mm.h> 19 #include <linux/interrupt.h> 20 #include <linux/clk.h> 21 #include <linux/delay.h> 22 #include <linux/sched.h> 23 #include <linux/semaphore.h> 24 #include <linux/spinlock.h> 25 #include <linux/device.h> 26 #include <linux/dma-mapping.h> 27 #include <linux/firmware.h> 28 #include <linux/slab.h> 29 #include <linux/platform_device.h> 30 #include <linux/dmaengine.h> 31 #include <linux/of.h> 32 #include <linux/of_address.h> 33 #include <linux/of_device.h> 34 #include <linux/of_dma.h> 35 #include <linux/workqueue.h> 36 37 #include <asm/irq.h> 38 #include <linux/platform_data/dma-imx-sdma.h> 39 #include <linux/platform_data/dma-imx.h> 40 #include <linux/regmap.h> 41 #include <linux/mfd/syscon.h> 42 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> 43 44 #include "dmaengine.h" 45 #include "virt-dma.h" 46 47 /* SDMA registers */ 48 #define SDMA_H_C0PTR 0x000 49 #define SDMA_H_INTR 0x004 50 #define SDMA_H_STATSTOP 0x008 51 #define SDMA_H_START 0x00c 52 #define SDMA_H_EVTOVR 0x010 53 #define SDMA_H_DSPOVR 0x014 54 #define SDMA_H_HOSTOVR 0x018 55 #define SDMA_H_EVTPEND 0x01c 56 #define SDMA_H_DSPENBL 0x020 57 #define SDMA_H_RESET 0x024 58 #define SDMA_H_EVTERR 0x028 59 #define SDMA_H_INTRMSK 0x02c 60 #define SDMA_H_PSW 0x030 61 #define SDMA_H_EVTERRDBG 0x034 62 #define SDMA_H_CONFIG 0x038 63 #define SDMA_ONCE_ENB 0x040 64 #define SDMA_ONCE_DATA 0x044 65 #define SDMA_ONCE_INSTR 0x048 66 #define SDMA_ONCE_STAT 0x04c 67 #define SDMA_ONCE_CMD 0x050 68 #define SDMA_EVT_MIRROR 0x054 69 #define SDMA_ILLINSTADDR 0x058 70 #define SDMA_CHN0ADDR 0x05c 71 #define SDMA_ONCE_RTB 0x060 72 #define SDMA_XTRIG_CONF1 0x070 73 #define SDMA_XTRIG_CONF2 0x074 74 #define SDMA_CHNENBL0_IMX35 0x200 75 #define SDMA_CHNENBL0_IMX31 0x080 76 #define SDMA_CHNPRI_0 0x100 77 78 /* 79 * Buffer descriptor status values. 80 */ 81 #define BD_DONE 0x01 82 #define BD_WRAP 0x02 83 #define BD_CONT 0x04 84 #define BD_INTR 0x08 85 #define BD_RROR 0x10 86 #define BD_LAST 0x20 87 #define BD_EXTD 0x80 88 89 /* 90 * Data Node descriptor status values. 91 */ 92 #define DND_END_OF_FRAME 0x80 93 #define DND_END_OF_XFER 0x40 94 #define DND_DONE 0x20 95 #define DND_UNUSED 0x01 96 97 /* 98 * IPCV2 descriptor status values. 99 */ 100 #define BD_IPCV2_END_OF_FRAME 0x40 101 102 #define IPCV2_MAX_NODES 50 103 /* 104 * Error bit set in the CCB status field by the SDMA, 105 * in setbd routine, in case of a transfer error 106 */ 107 #define DATA_ERROR 0x10000000 108 109 /* 110 * Buffer descriptor commands. 111 */ 112 #define C0_ADDR 0x01 113 #define C0_LOAD 0x02 114 #define C0_DUMP 0x03 115 #define C0_SETCTX 0x07 116 #define C0_GETCTX 0x03 117 #define C0_SETDM 0x01 118 #define C0_SETPM 0x04 119 #define C0_GETDM 0x02 120 #define C0_GETPM 0x08 121 /* 122 * Change endianness indicator in the BD command field 123 */ 124 #define CHANGE_ENDIANNESS 0x80 125 126 /* 127 * p_2_p watermark_level description 128 * Bits Name Description 129 * 0-7 Lower WML Lower watermark level 130 * 8 PS 1: Pad Swallowing 131 * 0: No Pad Swallowing 132 * 9 PA 1: Pad Adding 133 * 0: No Pad Adding 134 * 10 SPDIF If this bit is set both source 135 * and destination are on SPBA 136 * 11 Source Bit(SP) 1: Source on SPBA 137 * 0: Source on AIPS 138 * 12 Destination Bit(DP) 1: Destination on SPBA 139 * 0: Destination on AIPS 140 * 13-15 --------- MUST BE 0 141 * 16-23 Higher WML HWML 142 * 24-27 N Total number of samples after 143 * which Pad adding/Swallowing 144 * must be done. It must be odd. 145 * 28 Lower WML Event(LWE) SDMA events reg to check for 146 * LWML event mask 147 * 0: LWE in EVENTS register 148 * 1: LWE in EVENTS2 register 149 * 29 Higher WML Event(HWE) SDMA events reg to check for 150 * HWML event mask 151 * 0: HWE in EVENTS register 152 * 1: HWE in EVENTS2 register 153 * 30 --------- MUST BE 0 154 * 31 CONT 1: Amount of samples to be 155 * transferred is unknown and 156 * script will keep on 157 * transferring samples as long as 158 * both events are detected and 159 * script must be manually stopped 160 * by the application 161 * 0: The amount of samples to be 162 * transferred is equal to the 163 * count field of mode word 164 */ 165 #define SDMA_WATERMARK_LEVEL_LWML 0xFF 166 #define SDMA_WATERMARK_LEVEL_PS BIT(8) 167 #define SDMA_WATERMARK_LEVEL_PA BIT(9) 168 #define SDMA_WATERMARK_LEVEL_SPDIF BIT(10) 169 #define SDMA_WATERMARK_LEVEL_SP BIT(11) 170 #define SDMA_WATERMARK_LEVEL_DP BIT(12) 171 #define SDMA_WATERMARK_LEVEL_HWML (0xFF << 16) 172 #define SDMA_WATERMARK_LEVEL_LWE BIT(28) 173 #define SDMA_WATERMARK_LEVEL_HWE BIT(29) 174 #define SDMA_WATERMARK_LEVEL_CONT BIT(31) 175 176 #define SDMA_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ 177 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ 178 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) 179 180 #define SDMA_DMA_DIRECTIONS (BIT(DMA_DEV_TO_MEM) | \ 181 BIT(DMA_MEM_TO_DEV) | \ 182 BIT(DMA_DEV_TO_DEV)) 183 184 /* 185 * Mode/Count of data node descriptors - IPCv2 186 */ 187 struct sdma_mode_count { 188 #define SDMA_BD_MAX_CNT 0xffff 189 u32 count : 16; /* size of the buffer pointed by this BD */ 190 u32 status : 8; /* E,R,I,C,W,D status bits stored here */ 191 u32 command : 8; /* command mostly used for channel 0 */ 192 }; 193 194 /* 195 * Buffer descriptor 196 */ 197 struct sdma_buffer_descriptor { 198 struct sdma_mode_count mode; 199 u32 buffer_addr; /* address of the buffer described */ 200 u32 ext_buffer_addr; /* extended buffer address */ 201 } __attribute__ ((packed)); 202 203 /** 204 * struct sdma_channel_control - Channel control Block 205 * 206 * @current_bd_ptr: current buffer descriptor processed 207 * @base_bd_ptr: first element of buffer descriptor array 208 * @unused: padding. The SDMA engine expects an array of 128 byte 209 * control blocks 210 */ 211 struct sdma_channel_control { 212 u32 current_bd_ptr; 213 u32 base_bd_ptr; 214 u32 unused[2]; 215 } __attribute__ ((packed)); 216 217 /** 218 * struct sdma_state_registers - SDMA context for a channel 219 * 220 * @pc: program counter 221 * @unused1: unused 222 * @t: test bit: status of arithmetic & test instruction 223 * @rpc: return program counter 224 * @unused0: unused 225 * @sf: source fault while loading data 226 * @spc: loop start program counter 227 * @unused2: unused 228 * @df: destination fault while storing data 229 * @epc: loop end program counter 230 * @lm: loop mode 231 */ 232 struct sdma_state_registers { 233 u32 pc :14; 234 u32 unused1: 1; 235 u32 t : 1; 236 u32 rpc :14; 237 u32 unused0: 1; 238 u32 sf : 1; 239 u32 spc :14; 240 u32 unused2: 1; 241 u32 df : 1; 242 u32 epc :14; 243 u32 lm : 2; 244 } __attribute__ ((packed)); 245 246 /** 247 * struct sdma_context_data - sdma context specific to a channel 248 * 249 * @channel_state: channel state bits 250 * @gReg: general registers 251 * @mda: burst dma destination address register 252 * @msa: burst dma source address register 253 * @ms: burst dma status register 254 * @md: burst dma data register 255 * @pda: peripheral dma destination address register 256 * @psa: peripheral dma source address register 257 * @ps: peripheral dma status register 258 * @pd: peripheral dma data register 259 * @ca: CRC polynomial register 260 * @cs: CRC accumulator register 261 * @dda: dedicated core destination address register 262 * @dsa: dedicated core source address register 263 * @ds: dedicated core status register 264 * @dd: dedicated core data register 265 * @scratch0: 1st word of dedicated ram for context switch 266 * @scratch1: 2nd word of dedicated ram for context switch 267 * @scratch2: 3rd word of dedicated ram for context switch 268 * @scratch3: 4th word of dedicated ram for context switch 269 * @scratch4: 5th word of dedicated ram for context switch 270 * @scratch5: 6th word of dedicated ram for context switch 271 * @scratch6: 7th word of dedicated ram for context switch 272 * @scratch7: 8th word of dedicated ram for context switch 273 */ 274 struct sdma_context_data { 275 struct sdma_state_registers channel_state; 276 u32 gReg[8]; 277 u32 mda; 278 u32 msa; 279 u32 ms; 280 u32 md; 281 u32 pda; 282 u32 psa; 283 u32 ps; 284 u32 pd; 285 u32 ca; 286 u32 cs; 287 u32 dda; 288 u32 dsa; 289 u32 ds; 290 u32 dd; 291 u32 scratch0; 292 u32 scratch1; 293 u32 scratch2; 294 u32 scratch3; 295 u32 scratch4; 296 u32 scratch5; 297 u32 scratch6; 298 u32 scratch7; 299 } __attribute__ ((packed)); 300 301 302 struct sdma_engine; 303 304 /** 305 * struct sdma_desc - descriptor structor for one transfer 306 * @vd: descriptor for virt dma 307 * @num_bd: number of descriptors currently handling 308 * @bd_phys: physical address of bd 309 * @buf_tail: ID of the buffer that was processed 310 * @buf_ptail: ID of the previous buffer that was processed 311 * @period_len: period length, used in cyclic. 312 * @chn_real_count: the real count updated from bd->mode.count 313 * @chn_count: the transfer count set 314 * @sdmac: sdma_channel pointer 315 * @bd: pointer of allocate bd 316 */ 317 struct sdma_desc { 318 struct virt_dma_desc vd; 319 unsigned int num_bd; 320 dma_addr_t bd_phys; 321 unsigned int buf_tail; 322 unsigned int buf_ptail; 323 unsigned int period_len; 324 unsigned int chn_real_count; 325 unsigned int chn_count; 326 struct sdma_channel *sdmac; 327 struct sdma_buffer_descriptor *bd; 328 }; 329 330 /** 331 * struct sdma_channel - housekeeping for a SDMA channel 332 * 333 * @vc: virt_dma base structure 334 * @desc: sdma description including vd and other special member 335 * @sdma: pointer to the SDMA engine for this channel 336 * @channel: the channel number, matches dmaengine chan_id + 1 337 * @direction: transfer type. Needed for setting SDMA script 338 * @slave_config: Slave configuration 339 * @peripheral_type: Peripheral type. Needed for setting SDMA script 340 * @event_id0: aka dma request line 341 * @event_id1: for channels that use 2 events 342 * @word_size: peripheral access size 343 * @pc_from_device: script address for those device_2_memory 344 * @pc_to_device: script address for those memory_2_device 345 * @device_to_device: script address for those device_2_device 346 * @pc_to_pc: script address for those memory_2_memory 347 * @flags: loop mode or not 348 * @per_address: peripheral source or destination address in common case 349 * destination address in p_2_p case 350 * @per_address2: peripheral source address in p_2_p case 351 * @event_mask: event mask used in p_2_p script 352 * @watermark_level: value for gReg[7], some script will extend it from 353 * basic watermark such as p_2_p 354 * @shp_addr: value for gReg[6] 355 * @per_addr: value for gReg[2] 356 * @status: status of dma channel 357 * @context_loaded: ensure context is only loaded once 358 * @data: specific sdma interface structure 359 * @bd_pool: dma_pool for bd 360 * @terminate_worker: used to call back into terminate work function 361 */ 362 struct sdma_channel { 363 struct virt_dma_chan vc; 364 struct sdma_desc *desc; 365 struct sdma_engine *sdma; 366 unsigned int channel; 367 enum dma_transfer_direction direction; 368 struct dma_slave_config slave_config; 369 enum sdma_peripheral_type peripheral_type; 370 unsigned int event_id0; 371 unsigned int event_id1; 372 enum dma_slave_buswidth word_size; 373 unsigned int pc_from_device, pc_to_device; 374 unsigned int device_to_device; 375 unsigned int pc_to_pc; 376 unsigned long flags; 377 dma_addr_t per_address, per_address2; 378 unsigned long event_mask[2]; 379 unsigned long watermark_level; 380 u32 shp_addr, per_addr; 381 enum dma_status status; 382 bool context_loaded; 383 struct imx_dma_data data; 384 struct work_struct terminate_worker; 385 }; 386 387 #define IMX_DMA_SG_LOOP BIT(0) 388 389 #define MAX_DMA_CHANNELS 32 390 #define MXC_SDMA_DEFAULT_PRIORITY 1 391 #define MXC_SDMA_MIN_PRIORITY 1 392 #define MXC_SDMA_MAX_PRIORITY 7 393 394 #define SDMA_FIRMWARE_MAGIC 0x414d4453 395 396 /** 397 * struct sdma_firmware_header - Layout of the firmware image 398 * 399 * @magic: "SDMA" 400 * @version_major: increased whenever layout of struct 401 * sdma_script_start_addrs changes. 402 * @version_minor: firmware minor version (for binary compatible changes) 403 * @script_addrs_start: offset of struct sdma_script_start_addrs in this image 404 * @num_script_addrs: Number of script addresses in this image 405 * @ram_code_start: offset of SDMA ram image in this firmware image 406 * @ram_code_size: size of SDMA ram image 407 * @script_addrs: Stores the start address of the SDMA scripts 408 * (in SDMA memory space) 409 */ 410 struct sdma_firmware_header { 411 u32 magic; 412 u32 version_major; 413 u32 version_minor; 414 u32 script_addrs_start; 415 u32 num_script_addrs; 416 u32 ram_code_start; 417 u32 ram_code_size; 418 }; 419 420 struct sdma_driver_data { 421 int chnenbl0; 422 int num_events; 423 struct sdma_script_start_addrs *script_addrs; 424 bool check_ratio; 425 }; 426 427 struct sdma_engine { 428 struct device *dev; 429 struct device_dma_parameters dma_parms; 430 struct sdma_channel channel[MAX_DMA_CHANNELS]; 431 struct sdma_channel_control *channel_control; 432 void __iomem *regs; 433 struct sdma_context_data *context; 434 dma_addr_t context_phys; 435 struct dma_device dma_device; 436 struct clk *clk_ipg; 437 struct clk *clk_ahb; 438 spinlock_t channel_0_lock; 439 u32 script_number; 440 struct sdma_script_start_addrs *script_addrs; 441 const struct sdma_driver_data *drvdata; 442 u32 spba_start_addr; 443 u32 spba_end_addr; 444 unsigned int irq; 445 dma_addr_t bd0_phys; 446 struct sdma_buffer_descriptor *bd0; 447 /* clock ratio for AHB:SDMA core. 1:1 is 1, 2:1 is 0*/ 448 bool clk_ratio; 449 }; 450 451 static int sdma_config_write(struct dma_chan *chan, 452 struct dma_slave_config *dmaengine_cfg, 453 enum dma_transfer_direction direction); 454 455 static struct sdma_driver_data sdma_imx31 = { 456 .chnenbl0 = SDMA_CHNENBL0_IMX31, 457 .num_events = 32, 458 }; 459 460 static struct sdma_script_start_addrs sdma_script_imx25 = { 461 .ap_2_ap_addr = 729, 462 .uart_2_mcu_addr = 904, 463 .per_2_app_addr = 1255, 464 .mcu_2_app_addr = 834, 465 .uartsh_2_mcu_addr = 1120, 466 .per_2_shp_addr = 1329, 467 .mcu_2_shp_addr = 1048, 468 .ata_2_mcu_addr = 1560, 469 .mcu_2_ata_addr = 1479, 470 .app_2_per_addr = 1189, 471 .app_2_mcu_addr = 770, 472 .shp_2_per_addr = 1407, 473 .shp_2_mcu_addr = 979, 474 }; 475 476 static struct sdma_driver_data sdma_imx25 = { 477 .chnenbl0 = SDMA_CHNENBL0_IMX35, 478 .num_events = 48, 479 .script_addrs = &sdma_script_imx25, 480 }; 481 482 static struct sdma_driver_data sdma_imx35 = { 483 .chnenbl0 = SDMA_CHNENBL0_IMX35, 484 .num_events = 48, 485 }; 486 487 static struct sdma_script_start_addrs sdma_script_imx51 = { 488 .ap_2_ap_addr = 642, 489 .uart_2_mcu_addr = 817, 490 .mcu_2_app_addr = 747, 491 .mcu_2_shp_addr = 961, 492 .ata_2_mcu_addr = 1473, 493 .mcu_2_ata_addr = 1392, 494 .app_2_per_addr = 1033, 495 .app_2_mcu_addr = 683, 496 .shp_2_per_addr = 1251, 497 .shp_2_mcu_addr = 892, 498 }; 499 500 static struct sdma_driver_data sdma_imx51 = { 501 .chnenbl0 = SDMA_CHNENBL0_IMX35, 502 .num_events = 48, 503 .script_addrs = &sdma_script_imx51, 504 }; 505 506 static struct sdma_script_start_addrs sdma_script_imx53 = { 507 .ap_2_ap_addr = 642, 508 .app_2_mcu_addr = 683, 509 .mcu_2_app_addr = 747, 510 .uart_2_mcu_addr = 817, 511 .shp_2_mcu_addr = 891, 512 .mcu_2_shp_addr = 960, 513 .uartsh_2_mcu_addr = 1032, 514 .spdif_2_mcu_addr = 1100, 515 .mcu_2_spdif_addr = 1134, 516 .firi_2_mcu_addr = 1193, 517 .mcu_2_firi_addr = 1290, 518 }; 519 520 static struct sdma_driver_data sdma_imx53 = { 521 .chnenbl0 = SDMA_CHNENBL0_IMX35, 522 .num_events = 48, 523 .script_addrs = &sdma_script_imx53, 524 }; 525 526 static struct sdma_script_start_addrs sdma_script_imx6q = { 527 .ap_2_ap_addr = 642, 528 .uart_2_mcu_addr = 817, 529 .mcu_2_app_addr = 747, 530 .per_2_per_addr = 6331, 531 .uartsh_2_mcu_addr = 1032, 532 .mcu_2_shp_addr = 960, 533 .app_2_mcu_addr = 683, 534 .shp_2_mcu_addr = 891, 535 .spdif_2_mcu_addr = 1100, 536 .mcu_2_spdif_addr = 1134, 537 }; 538 539 static struct sdma_driver_data sdma_imx6q = { 540 .chnenbl0 = SDMA_CHNENBL0_IMX35, 541 .num_events = 48, 542 .script_addrs = &sdma_script_imx6q, 543 }; 544 545 static struct sdma_script_start_addrs sdma_script_imx7d = { 546 .ap_2_ap_addr = 644, 547 .uart_2_mcu_addr = 819, 548 .mcu_2_app_addr = 749, 549 .uartsh_2_mcu_addr = 1034, 550 .mcu_2_shp_addr = 962, 551 .app_2_mcu_addr = 685, 552 .shp_2_mcu_addr = 893, 553 .spdif_2_mcu_addr = 1102, 554 .mcu_2_spdif_addr = 1136, 555 }; 556 557 static struct sdma_driver_data sdma_imx7d = { 558 .chnenbl0 = SDMA_CHNENBL0_IMX35, 559 .num_events = 48, 560 .script_addrs = &sdma_script_imx7d, 561 }; 562 563 static struct sdma_driver_data sdma_imx8mq = { 564 .chnenbl0 = SDMA_CHNENBL0_IMX35, 565 .num_events = 48, 566 .script_addrs = &sdma_script_imx7d, 567 .check_ratio = 1, 568 }; 569 570 static const struct platform_device_id sdma_devtypes[] = { 571 { 572 .name = "imx25-sdma", 573 .driver_data = (unsigned long)&sdma_imx25, 574 }, { 575 .name = "imx31-sdma", 576 .driver_data = (unsigned long)&sdma_imx31, 577 }, { 578 .name = "imx35-sdma", 579 .driver_data = (unsigned long)&sdma_imx35, 580 }, { 581 .name = "imx51-sdma", 582 .driver_data = (unsigned long)&sdma_imx51, 583 }, { 584 .name = "imx53-sdma", 585 .driver_data = (unsigned long)&sdma_imx53, 586 }, { 587 .name = "imx6q-sdma", 588 .driver_data = (unsigned long)&sdma_imx6q, 589 }, { 590 .name = "imx7d-sdma", 591 .driver_data = (unsigned long)&sdma_imx7d, 592 }, { 593 .name = "imx8mq-sdma", 594 .driver_data = (unsigned long)&sdma_imx8mq, 595 }, { 596 /* sentinel */ 597 } 598 }; 599 MODULE_DEVICE_TABLE(platform, sdma_devtypes); 600 601 static const struct of_device_id sdma_dt_ids[] = { 602 { .compatible = "fsl,imx6q-sdma", .data = &sdma_imx6q, }, 603 { .compatible = "fsl,imx53-sdma", .data = &sdma_imx53, }, 604 { .compatible = "fsl,imx51-sdma", .data = &sdma_imx51, }, 605 { .compatible = "fsl,imx35-sdma", .data = &sdma_imx35, }, 606 { .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, }, 607 { .compatible = "fsl,imx25-sdma", .data = &sdma_imx25, }, 608 { .compatible = "fsl,imx7d-sdma", .data = &sdma_imx7d, }, 609 { .compatible = "fsl,imx8mq-sdma", .data = &sdma_imx8mq, }, 610 { /* sentinel */ } 611 }; 612 MODULE_DEVICE_TABLE(of, sdma_dt_ids); 613 614 #define SDMA_H_CONFIG_DSPDMA BIT(12) /* indicates if the DSPDMA is used */ 615 #define SDMA_H_CONFIG_RTD_PINS BIT(11) /* indicates if Real-Time Debug pins are enabled */ 616 #define SDMA_H_CONFIG_ACR BIT(4) /* indicates if AHB freq /core freq = 2 or 1 */ 617 #define SDMA_H_CONFIG_CSM (3) /* indicates which context switch mode is selected*/ 618 619 static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event) 620 { 621 u32 chnenbl0 = sdma->drvdata->chnenbl0; 622 return chnenbl0 + event * 4; 623 } 624 625 static int sdma_config_ownership(struct sdma_channel *sdmac, 626 bool event_override, bool mcu_override, bool dsp_override) 627 { 628 struct sdma_engine *sdma = sdmac->sdma; 629 int channel = sdmac->channel; 630 unsigned long evt, mcu, dsp; 631 632 if (event_override && mcu_override && dsp_override) 633 return -EINVAL; 634 635 evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR); 636 mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR); 637 dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR); 638 639 if (dsp_override) 640 __clear_bit(channel, &dsp); 641 else 642 __set_bit(channel, &dsp); 643 644 if (event_override) 645 __clear_bit(channel, &evt); 646 else 647 __set_bit(channel, &evt); 648 649 if (mcu_override) 650 __clear_bit(channel, &mcu); 651 else 652 __set_bit(channel, &mcu); 653 654 writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR); 655 writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR); 656 writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR); 657 658 return 0; 659 } 660 661 static void sdma_enable_channel(struct sdma_engine *sdma, int channel) 662 { 663 writel(BIT(channel), sdma->regs + SDMA_H_START); 664 } 665 666 /* 667 * sdma_run_channel0 - run a channel and wait till it's done 668 */ 669 static int sdma_run_channel0(struct sdma_engine *sdma) 670 { 671 int ret; 672 u32 reg; 673 674 sdma_enable_channel(sdma, 0); 675 676 ret = readl_relaxed_poll_timeout_atomic(sdma->regs + SDMA_H_STATSTOP, 677 reg, !(reg & 1), 1, 500); 678 if (ret) 679 dev_err(sdma->dev, "Timeout waiting for CH0 ready\n"); 680 681 /* Set bits of CONFIG register with dynamic context switching */ 682 reg = readl(sdma->regs + SDMA_H_CONFIG); 683 if ((reg & SDMA_H_CONFIG_CSM) == 0) { 684 reg |= SDMA_H_CONFIG_CSM; 685 writel_relaxed(reg, sdma->regs + SDMA_H_CONFIG); 686 } 687 688 return ret; 689 } 690 691 static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size, 692 u32 address) 693 { 694 struct sdma_buffer_descriptor *bd0 = sdma->bd0; 695 void *buf_virt; 696 dma_addr_t buf_phys; 697 int ret; 698 unsigned long flags; 699 700 buf_virt = dma_alloc_coherent(sdma->dev, size, &buf_phys, GFP_KERNEL); 701 if (!buf_virt) { 702 return -ENOMEM; 703 } 704 705 spin_lock_irqsave(&sdma->channel_0_lock, flags); 706 707 bd0->mode.command = C0_SETPM; 708 bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD; 709 bd0->mode.count = size / 2; 710 bd0->buffer_addr = buf_phys; 711 bd0->ext_buffer_addr = address; 712 713 memcpy(buf_virt, buf, size); 714 715 ret = sdma_run_channel0(sdma); 716 717 spin_unlock_irqrestore(&sdma->channel_0_lock, flags); 718 719 dma_free_coherent(sdma->dev, size, buf_virt, buf_phys); 720 721 return ret; 722 } 723 724 static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event) 725 { 726 struct sdma_engine *sdma = sdmac->sdma; 727 int channel = sdmac->channel; 728 unsigned long val; 729 u32 chnenbl = chnenbl_ofs(sdma, event); 730 731 val = readl_relaxed(sdma->regs + chnenbl); 732 __set_bit(channel, &val); 733 writel_relaxed(val, sdma->regs + chnenbl); 734 } 735 736 static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event) 737 { 738 struct sdma_engine *sdma = sdmac->sdma; 739 int channel = sdmac->channel; 740 u32 chnenbl = chnenbl_ofs(sdma, event); 741 unsigned long val; 742 743 val = readl_relaxed(sdma->regs + chnenbl); 744 __clear_bit(channel, &val); 745 writel_relaxed(val, sdma->regs + chnenbl); 746 } 747 748 static struct sdma_desc *to_sdma_desc(struct dma_async_tx_descriptor *t) 749 { 750 return container_of(t, struct sdma_desc, vd.tx); 751 } 752 753 static void sdma_start_desc(struct sdma_channel *sdmac) 754 { 755 struct virt_dma_desc *vd = vchan_next_desc(&sdmac->vc); 756 struct sdma_desc *desc; 757 struct sdma_engine *sdma = sdmac->sdma; 758 int channel = sdmac->channel; 759 760 if (!vd) { 761 sdmac->desc = NULL; 762 return; 763 } 764 sdmac->desc = desc = to_sdma_desc(&vd->tx); 765 766 list_del(&vd->node); 767 768 sdma->channel_control[channel].base_bd_ptr = desc->bd_phys; 769 sdma->channel_control[channel].current_bd_ptr = desc->bd_phys; 770 sdma_enable_channel(sdma, sdmac->channel); 771 } 772 773 static void sdma_update_channel_loop(struct sdma_channel *sdmac) 774 { 775 struct sdma_buffer_descriptor *bd; 776 int error = 0; 777 enum dma_status old_status = sdmac->status; 778 779 /* 780 * loop mode. Iterate over descriptors, re-setup them and 781 * call callback function. 782 */ 783 while (sdmac->desc) { 784 struct sdma_desc *desc = sdmac->desc; 785 786 bd = &desc->bd[desc->buf_tail]; 787 788 if (bd->mode.status & BD_DONE) 789 break; 790 791 if (bd->mode.status & BD_RROR) { 792 bd->mode.status &= ~BD_RROR; 793 sdmac->status = DMA_ERROR; 794 error = -EIO; 795 } 796 797 /* 798 * We use bd->mode.count to calculate the residue, since contains 799 * the number of bytes present in the current buffer descriptor. 800 */ 801 802 desc->chn_real_count = bd->mode.count; 803 bd->mode.status |= BD_DONE; 804 bd->mode.count = desc->period_len; 805 desc->buf_ptail = desc->buf_tail; 806 desc->buf_tail = (desc->buf_tail + 1) % desc->num_bd; 807 808 /* 809 * The callback is called from the interrupt context in order 810 * to reduce latency and to avoid the risk of altering the 811 * SDMA transaction status by the time the client tasklet is 812 * executed. 813 */ 814 spin_unlock(&sdmac->vc.lock); 815 dmaengine_desc_get_callback_invoke(&desc->vd.tx, NULL); 816 spin_lock(&sdmac->vc.lock); 817 818 if (error) 819 sdmac->status = old_status; 820 } 821 } 822 823 static void mxc_sdma_handle_channel_normal(struct sdma_channel *data) 824 { 825 struct sdma_channel *sdmac = (struct sdma_channel *) data; 826 struct sdma_buffer_descriptor *bd; 827 int i, error = 0; 828 829 sdmac->desc->chn_real_count = 0; 830 /* 831 * non loop mode. Iterate over all descriptors, collect 832 * errors and call callback function 833 */ 834 for (i = 0; i < sdmac->desc->num_bd; i++) { 835 bd = &sdmac->desc->bd[i]; 836 837 if (bd->mode.status & (BD_DONE | BD_RROR)) 838 error = -EIO; 839 sdmac->desc->chn_real_count += bd->mode.count; 840 } 841 842 if (error) 843 sdmac->status = DMA_ERROR; 844 else 845 sdmac->status = DMA_COMPLETE; 846 } 847 848 static irqreturn_t sdma_int_handler(int irq, void *dev_id) 849 { 850 struct sdma_engine *sdma = dev_id; 851 unsigned long stat; 852 853 stat = readl_relaxed(sdma->regs + SDMA_H_INTR); 854 writel_relaxed(stat, sdma->regs + SDMA_H_INTR); 855 /* channel 0 is special and not handled here, see run_channel0() */ 856 stat &= ~1; 857 858 while (stat) { 859 int channel = fls(stat) - 1; 860 struct sdma_channel *sdmac = &sdma->channel[channel]; 861 struct sdma_desc *desc; 862 863 spin_lock(&sdmac->vc.lock); 864 desc = sdmac->desc; 865 if (desc) { 866 if (sdmac->flags & IMX_DMA_SG_LOOP) { 867 sdma_update_channel_loop(sdmac); 868 } else { 869 mxc_sdma_handle_channel_normal(sdmac); 870 vchan_cookie_complete(&desc->vd); 871 sdma_start_desc(sdmac); 872 } 873 } 874 875 spin_unlock(&sdmac->vc.lock); 876 __clear_bit(channel, &stat); 877 } 878 879 return IRQ_HANDLED; 880 } 881 882 /* 883 * sets the pc of SDMA script according to the peripheral type 884 */ 885 static void sdma_get_pc(struct sdma_channel *sdmac, 886 enum sdma_peripheral_type peripheral_type) 887 { 888 struct sdma_engine *sdma = sdmac->sdma; 889 int per_2_emi = 0, emi_2_per = 0; 890 /* 891 * These are needed once we start to support transfers between 892 * two peripherals or memory-to-memory transfers 893 */ 894 int per_2_per = 0, emi_2_emi = 0; 895 896 sdmac->pc_from_device = 0; 897 sdmac->pc_to_device = 0; 898 sdmac->device_to_device = 0; 899 sdmac->pc_to_pc = 0; 900 901 switch (peripheral_type) { 902 case IMX_DMATYPE_MEMORY: 903 emi_2_emi = sdma->script_addrs->ap_2_ap_addr; 904 break; 905 case IMX_DMATYPE_DSP: 906 emi_2_per = sdma->script_addrs->bp_2_ap_addr; 907 per_2_emi = sdma->script_addrs->ap_2_bp_addr; 908 break; 909 case IMX_DMATYPE_FIRI: 910 per_2_emi = sdma->script_addrs->firi_2_mcu_addr; 911 emi_2_per = sdma->script_addrs->mcu_2_firi_addr; 912 break; 913 case IMX_DMATYPE_UART: 914 per_2_emi = sdma->script_addrs->uart_2_mcu_addr; 915 emi_2_per = sdma->script_addrs->mcu_2_app_addr; 916 break; 917 case IMX_DMATYPE_UART_SP: 918 per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr; 919 emi_2_per = sdma->script_addrs->mcu_2_shp_addr; 920 break; 921 case IMX_DMATYPE_ATA: 922 per_2_emi = sdma->script_addrs->ata_2_mcu_addr; 923 emi_2_per = sdma->script_addrs->mcu_2_ata_addr; 924 break; 925 case IMX_DMATYPE_CSPI: 926 case IMX_DMATYPE_EXT: 927 case IMX_DMATYPE_SSI: 928 case IMX_DMATYPE_SAI: 929 per_2_emi = sdma->script_addrs->app_2_mcu_addr; 930 emi_2_per = sdma->script_addrs->mcu_2_app_addr; 931 break; 932 case IMX_DMATYPE_SSI_DUAL: 933 per_2_emi = sdma->script_addrs->ssish_2_mcu_addr; 934 emi_2_per = sdma->script_addrs->mcu_2_ssish_addr; 935 break; 936 case IMX_DMATYPE_SSI_SP: 937 case IMX_DMATYPE_MMC: 938 case IMX_DMATYPE_SDHC: 939 case IMX_DMATYPE_CSPI_SP: 940 case IMX_DMATYPE_ESAI: 941 case IMX_DMATYPE_MSHC_SP: 942 per_2_emi = sdma->script_addrs->shp_2_mcu_addr; 943 emi_2_per = sdma->script_addrs->mcu_2_shp_addr; 944 break; 945 case IMX_DMATYPE_ASRC: 946 per_2_emi = sdma->script_addrs->asrc_2_mcu_addr; 947 emi_2_per = sdma->script_addrs->asrc_2_mcu_addr; 948 per_2_per = sdma->script_addrs->per_2_per_addr; 949 break; 950 case IMX_DMATYPE_ASRC_SP: 951 per_2_emi = sdma->script_addrs->shp_2_mcu_addr; 952 emi_2_per = sdma->script_addrs->mcu_2_shp_addr; 953 per_2_per = sdma->script_addrs->per_2_per_addr; 954 break; 955 case IMX_DMATYPE_MSHC: 956 per_2_emi = sdma->script_addrs->mshc_2_mcu_addr; 957 emi_2_per = sdma->script_addrs->mcu_2_mshc_addr; 958 break; 959 case IMX_DMATYPE_CCM: 960 per_2_emi = sdma->script_addrs->dptc_dvfs_addr; 961 break; 962 case IMX_DMATYPE_SPDIF: 963 per_2_emi = sdma->script_addrs->spdif_2_mcu_addr; 964 emi_2_per = sdma->script_addrs->mcu_2_spdif_addr; 965 break; 966 case IMX_DMATYPE_IPU_MEMORY: 967 emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr; 968 break; 969 default: 970 break; 971 } 972 973 sdmac->pc_from_device = per_2_emi; 974 sdmac->pc_to_device = emi_2_per; 975 sdmac->device_to_device = per_2_per; 976 sdmac->pc_to_pc = emi_2_emi; 977 } 978 979 static int sdma_load_context(struct sdma_channel *sdmac) 980 { 981 struct sdma_engine *sdma = sdmac->sdma; 982 int channel = sdmac->channel; 983 int load_address; 984 struct sdma_context_data *context = sdma->context; 985 struct sdma_buffer_descriptor *bd0 = sdma->bd0; 986 int ret; 987 unsigned long flags; 988 989 if (sdmac->context_loaded) 990 return 0; 991 992 if (sdmac->direction == DMA_DEV_TO_MEM) 993 load_address = sdmac->pc_from_device; 994 else if (sdmac->direction == DMA_DEV_TO_DEV) 995 load_address = sdmac->device_to_device; 996 else if (sdmac->direction == DMA_MEM_TO_MEM) 997 load_address = sdmac->pc_to_pc; 998 else 999 load_address = sdmac->pc_to_device; 1000 1001 if (load_address < 0) 1002 return load_address; 1003 1004 dev_dbg(sdma->dev, "load_address = %d\n", load_address); 1005 dev_dbg(sdma->dev, "wml = 0x%08x\n", (u32)sdmac->watermark_level); 1006 dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr); 1007 dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr); 1008 dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]); 1009 dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]); 1010 1011 spin_lock_irqsave(&sdma->channel_0_lock, flags); 1012 1013 memset(context, 0, sizeof(*context)); 1014 context->channel_state.pc = load_address; 1015 1016 /* Send by context the event mask,base address for peripheral 1017 * and watermark level 1018 */ 1019 context->gReg[0] = sdmac->event_mask[1]; 1020 context->gReg[1] = sdmac->event_mask[0]; 1021 context->gReg[2] = sdmac->per_addr; 1022 context->gReg[6] = sdmac->shp_addr; 1023 context->gReg[7] = sdmac->watermark_level; 1024 1025 bd0->mode.command = C0_SETDM; 1026 bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD; 1027 bd0->mode.count = sizeof(*context) / 4; 1028 bd0->buffer_addr = sdma->context_phys; 1029 bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel; 1030 ret = sdma_run_channel0(sdma); 1031 1032 spin_unlock_irqrestore(&sdma->channel_0_lock, flags); 1033 1034 sdmac->context_loaded = true; 1035 1036 return ret; 1037 } 1038 1039 static struct sdma_channel *to_sdma_chan(struct dma_chan *chan) 1040 { 1041 return container_of(chan, struct sdma_channel, vc.chan); 1042 } 1043 1044 static int sdma_disable_channel(struct dma_chan *chan) 1045 { 1046 struct sdma_channel *sdmac = to_sdma_chan(chan); 1047 struct sdma_engine *sdma = sdmac->sdma; 1048 int channel = sdmac->channel; 1049 1050 writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP); 1051 sdmac->status = DMA_ERROR; 1052 1053 return 0; 1054 } 1055 static void sdma_channel_terminate_work(struct work_struct *work) 1056 { 1057 struct sdma_channel *sdmac = container_of(work, struct sdma_channel, 1058 terminate_worker); 1059 unsigned long flags; 1060 LIST_HEAD(head); 1061 1062 /* 1063 * According to NXP R&D team a delay of one BD SDMA cost time 1064 * (maximum is 1ms) should be added after disable of the channel 1065 * bit, to ensure SDMA core has really been stopped after SDMA 1066 * clients call .device_terminate_all. 1067 */ 1068 usleep_range(1000, 2000); 1069 1070 spin_lock_irqsave(&sdmac->vc.lock, flags); 1071 vchan_get_all_descriptors(&sdmac->vc, &head); 1072 spin_unlock_irqrestore(&sdmac->vc.lock, flags); 1073 vchan_dma_desc_free_list(&sdmac->vc, &head); 1074 sdmac->context_loaded = false; 1075 } 1076 1077 static int sdma_terminate_all(struct dma_chan *chan) 1078 { 1079 struct sdma_channel *sdmac = to_sdma_chan(chan); 1080 unsigned long flags; 1081 1082 spin_lock_irqsave(&sdmac->vc.lock, flags); 1083 1084 sdma_disable_channel(chan); 1085 1086 if (sdmac->desc) { 1087 vchan_terminate_vdesc(&sdmac->desc->vd); 1088 sdmac->desc = NULL; 1089 schedule_work(&sdmac->terminate_worker); 1090 } 1091 1092 spin_unlock_irqrestore(&sdmac->vc.lock, flags); 1093 1094 return 0; 1095 } 1096 1097 static void sdma_channel_synchronize(struct dma_chan *chan) 1098 { 1099 struct sdma_channel *sdmac = to_sdma_chan(chan); 1100 1101 vchan_synchronize(&sdmac->vc); 1102 1103 flush_work(&sdmac->terminate_worker); 1104 } 1105 1106 static void sdma_set_watermarklevel_for_p2p(struct sdma_channel *sdmac) 1107 { 1108 struct sdma_engine *sdma = sdmac->sdma; 1109 1110 int lwml = sdmac->watermark_level & SDMA_WATERMARK_LEVEL_LWML; 1111 int hwml = (sdmac->watermark_level & SDMA_WATERMARK_LEVEL_HWML) >> 16; 1112 1113 set_bit(sdmac->event_id0 % 32, &sdmac->event_mask[1]); 1114 set_bit(sdmac->event_id1 % 32, &sdmac->event_mask[0]); 1115 1116 if (sdmac->event_id0 > 31) 1117 sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_LWE; 1118 1119 if (sdmac->event_id1 > 31) 1120 sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_HWE; 1121 1122 /* 1123 * If LWML(src_maxburst) > HWML(dst_maxburst), we need 1124 * swap LWML and HWML of INFO(A.3.2.5.1), also need swap 1125 * r0(event_mask[1]) and r1(event_mask[0]). 1126 */ 1127 if (lwml > hwml) { 1128 sdmac->watermark_level &= ~(SDMA_WATERMARK_LEVEL_LWML | 1129 SDMA_WATERMARK_LEVEL_HWML); 1130 sdmac->watermark_level |= hwml; 1131 sdmac->watermark_level |= lwml << 16; 1132 swap(sdmac->event_mask[0], sdmac->event_mask[1]); 1133 } 1134 1135 if (sdmac->per_address2 >= sdma->spba_start_addr && 1136 sdmac->per_address2 <= sdma->spba_end_addr) 1137 sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_SP; 1138 1139 if (sdmac->per_address >= sdma->spba_start_addr && 1140 sdmac->per_address <= sdma->spba_end_addr) 1141 sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_DP; 1142 1143 sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_CONT; 1144 } 1145 1146 static int sdma_config_channel(struct dma_chan *chan) 1147 { 1148 struct sdma_channel *sdmac = to_sdma_chan(chan); 1149 int ret; 1150 1151 sdma_disable_channel(chan); 1152 1153 sdmac->event_mask[0] = 0; 1154 sdmac->event_mask[1] = 0; 1155 sdmac->shp_addr = 0; 1156 sdmac->per_addr = 0; 1157 1158 switch (sdmac->peripheral_type) { 1159 case IMX_DMATYPE_DSP: 1160 sdma_config_ownership(sdmac, false, true, true); 1161 break; 1162 case IMX_DMATYPE_MEMORY: 1163 sdma_config_ownership(sdmac, false, true, false); 1164 break; 1165 default: 1166 sdma_config_ownership(sdmac, true, true, false); 1167 break; 1168 } 1169 1170 sdma_get_pc(sdmac, sdmac->peripheral_type); 1171 1172 if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) && 1173 (sdmac->peripheral_type != IMX_DMATYPE_DSP)) { 1174 /* Handle multiple event channels differently */ 1175 if (sdmac->event_id1) { 1176 if (sdmac->peripheral_type == IMX_DMATYPE_ASRC_SP || 1177 sdmac->peripheral_type == IMX_DMATYPE_ASRC) 1178 sdma_set_watermarklevel_for_p2p(sdmac); 1179 } else 1180 __set_bit(sdmac->event_id0, sdmac->event_mask); 1181 1182 /* Address */ 1183 sdmac->shp_addr = sdmac->per_address; 1184 sdmac->per_addr = sdmac->per_address2; 1185 } else { 1186 sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */ 1187 } 1188 1189 ret = sdma_load_context(sdmac); 1190 1191 return ret; 1192 } 1193 1194 static int sdma_set_channel_priority(struct sdma_channel *sdmac, 1195 unsigned int priority) 1196 { 1197 struct sdma_engine *sdma = sdmac->sdma; 1198 int channel = sdmac->channel; 1199 1200 if (priority < MXC_SDMA_MIN_PRIORITY 1201 || priority > MXC_SDMA_MAX_PRIORITY) { 1202 return -EINVAL; 1203 } 1204 1205 writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel); 1206 1207 return 0; 1208 } 1209 1210 static int sdma_request_channel0(struct sdma_engine *sdma) 1211 { 1212 int ret = -EBUSY; 1213 1214 sdma->bd0 = dma_alloc_coherent(sdma->dev, PAGE_SIZE, &sdma->bd0_phys, 1215 GFP_NOWAIT); 1216 if (!sdma->bd0) { 1217 ret = -ENOMEM; 1218 goto out; 1219 } 1220 1221 sdma->channel_control[0].base_bd_ptr = sdma->bd0_phys; 1222 sdma->channel_control[0].current_bd_ptr = sdma->bd0_phys; 1223 1224 sdma_set_channel_priority(&sdma->channel[0], MXC_SDMA_DEFAULT_PRIORITY); 1225 return 0; 1226 out: 1227 1228 return ret; 1229 } 1230 1231 1232 static int sdma_alloc_bd(struct sdma_desc *desc) 1233 { 1234 u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor); 1235 int ret = 0; 1236 1237 desc->bd = dma_alloc_coherent(desc->sdmac->sdma->dev, bd_size, 1238 &desc->bd_phys, GFP_NOWAIT); 1239 if (!desc->bd) { 1240 ret = -ENOMEM; 1241 goto out; 1242 } 1243 out: 1244 return ret; 1245 } 1246 1247 static void sdma_free_bd(struct sdma_desc *desc) 1248 { 1249 u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor); 1250 1251 dma_free_coherent(desc->sdmac->sdma->dev, bd_size, desc->bd, 1252 desc->bd_phys); 1253 } 1254 1255 static void sdma_desc_free(struct virt_dma_desc *vd) 1256 { 1257 struct sdma_desc *desc = container_of(vd, struct sdma_desc, vd); 1258 1259 sdma_free_bd(desc); 1260 kfree(desc); 1261 } 1262 1263 static int sdma_alloc_chan_resources(struct dma_chan *chan) 1264 { 1265 struct sdma_channel *sdmac = to_sdma_chan(chan); 1266 struct imx_dma_data *data = chan->private; 1267 struct imx_dma_data mem_data; 1268 int prio, ret; 1269 1270 /* 1271 * MEMCPY may never setup chan->private by filter function such as 1272 * dmatest, thus create 'struct imx_dma_data mem_data' for this case. 1273 * Please note in any other slave case, you have to setup chan->private 1274 * with 'struct imx_dma_data' in your own filter function if you want to 1275 * request dma channel by dma_request_channel() rather than 1276 * dma_request_slave_channel(). Othwise, 'MEMCPY in case?' will appear 1277 * to warn you to correct your filter function. 1278 */ 1279 if (!data) { 1280 dev_dbg(sdmac->sdma->dev, "MEMCPY in case?\n"); 1281 mem_data.priority = 2; 1282 mem_data.peripheral_type = IMX_DMATYPE_MEMORY; 1283 mem_data.dma_request = 0; 1284 mem_data.dma_request2 = 0; 1285 data = &mem_data; 1286 1287 sdma_get_pc(sdmac, IMX_DMATYPE_MEMORY); 1288 } 1289 1290 switch (data->priority) { 1291 case DMA_PRIO_HIGH: 1292 prio = 3; 1293 break; 1294 case DMA_PRIO_MEDIUM: 1295 prio = 2; 1296 break; 1297 case DMA_PRIO_LOW: 1298 default: 1299 prio = 1; 1300 break; 1301 } 1302 1303 sdmac->peripheral_type = data->peripheral_type; 1304 sdmac->event_id0 = data->dma_request; 1305 sdmac->event_id1 = data->dma_request2; 1306 1307 ret = clk_enable(sdmac->sdma->clk_ipg); 1308 if (ret) 1309 return ret; 1310 ret = clk_enable(sdmac->sdma->clk_ahb); 1311 if (ret) 1312 goto disable_clk_ipg; 1313 1314 ret = sdma_set_channel_priority(sdmac, prio); 1315 if (ret) 1316 goto disable_clk_ahb; 1317 1318 return 0; 1319 1320 disable_clk_ahb: 1321 clk_disable(sdmac->sdma->clk_ahb); 1322 disable_clk_ipg: 1323 clk_disable(sdmac->sdma->clk_ipg); 1324 return ret; 1325 } 1326 1327 static void sdma_free_chan_resources(struct dma_chan *chan) 1328 { 1329 struct sdma_channel *sdmac = to_sdma_chan(chan); 1330 struct sdma_engine *sdma = sdmac->sdma; 1331 1332 sdma_terminate_all(chan); 1333 1334 sdma_channel_synchronize(chan); 1335 1336 sdma_event_disable(sdmac, sdmac->event_id0); 1337 if (sdmac->event_id1) 1338 sdma_event_disable(sdmac, sdmac->event_id1); 1339 1340 sdmac->event_id0 = 0; 1341 sdmac->event_id1 = 0; 1342 sdmac->context_loaded = false; 1343 1344 sdma_set_channel_priority(sdmac, 0); 1345 1346 clk_disable(sdma->clk_ipg); 1347 clk_disable(sdma->clk_ahb); 1348 } 1349 1350 static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac, 1351 enum dma_transfer_direction direction, u32 bds) 1352 { 1353 struct sdma_desc *desc; 1354 1355 desc = kzalloc((sizeof(*desc)), GFP_NOWAIT); 1356 if (!desc) 1357 goto err_out; 1358 1359 sdmac->status = DMA_IN_PROGRESS; 1360 sdmac->direction = direction; 1361 sdmac->flags = 0; 1362 1363 desc->chn_count = 0; 1364 desc->chn_real_count = 0; 1365 desc->buf_tail = 0; 1366 desc->buf_ptail = 0; 1367 desc->sdmac = sdmac; 1368 desc->num_bd = bds; 1369 1370 if (sdma_alloc_bd(desc)) 1371 goto err_desc_out; 1372 1373 /* No slave_config called in MEMCPY case, so do here */ 1374 if (direction == DMA_MEM_TO_MEM) 1375 sdma_config_ownership(sdmac, false, true, false); 1376 1377 if (sdma_load_context(sdmac)) 1378 goto err_desc_out; 1379 1380 return desc; 1381 1382 err_desc_out: 1383 kfree(desc); 1384 err_out: 1385 return NULL; 1386 } 1387 1388 static struct dma_async_tx_descriptor *sdma_prep_memcpy( 1389 struct dma_chan *chan, dma_addr_t dma_dst, 1390 dma_addr_t dma_src, size_t len, unsigned long flags) 1391 { 1392 struct sdma_channel *sdmac = to_sdma_chan(chan); 1393 struct sdma_engine *sdma = sdmac->sdma; 1394 int channel = sdmac->channel; 1395 size_t count; 1396 int i = 0, param; 1397 struct sdma_buffer_descriptor *bd; 1398 struct sdma_desc *desc; 1399 1400 if (!chan || !len) 1401 return NULL; 1402 1403 dev_dbg(sdma->dev, "memcpy: %pad->%pad, len=%zu, channel=%d.\n", 1404 &dma_src, &dma_dst, len, channel); 1405 1406 desc = sdma_transfer_init(sdmac, DMA_MEM_TO_MEM, 1407 len / SDMA_BD_MAX_CNT + 1); 1408 if (!desc) 1409 return NULL; 1410 1411 do { 1412 count = min_t(size_t, len, SDMA_BD_MAX_CNT); 1413 bd = &desc->bd[i]; 1414 bd->buffer_addr = dma_src; 1415 bd->ext_buffer_addr = dma_dst; 1416 bd->mode.count = count; 1417 desc->chn_count += count; 1418 bd->mode.command = 0; 1419 1420 dma_src += count; 1421 dma_dst += count; 1422 len -= count; 1423 i++; 1424 1425 param = BD_DONE | BD_EXTD | BD_CONT; 1426 /* last bd */ 1427 if (!len) { 1428 param |= BD_INTR; 1429 param |= BD_LAST; 1430 param &= ~BD_CONT; 1431 } 1432 1433 dev_dbg(sdma->dev, "entry %d: count: %zd dma: 0x%x %s%s\n", 1434 i, count, bd->buffer_addr, 1435 param & BD_WRAP ? "wrap" : "", 1436 param & BD_INTR ? " intr" : ""); 1437 1438 bd->mode.status = param; 1439 } while (len); 1440 1441 return vchan_tx_prep(&sdmac->vc, &desc->vd, flags); 1442 } 1443 1444 static struct dma_async_tx_descriptor *sdma_prep_slave_sg( 1445 struct dma_chan *chan, struct scatterlist *sgl, 1446 unsigned int sg_len, enum dma_transfer_direction direction, 1447 unsigned long flags, void *context) 1448 { 1449 struct sdma_channel *sdmac = to_sdma_chan(chan); 1450 struct sdma_engine *sdma = sdmac->sdma; 1451 int i, count; 1452 int channel = sdmac->channel; 1453 struct scatterlist *sg; 1454 struct sdma_desc *desc; 1455 1456 sdma_config_write(chan, &sdmac->slave_config, direction); 1457 1458 desc = sdma_transfer_init(sdmac, direction, sg_len); 1459 if (!desc) 1460 goto err_out; 1461 1462 dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n", 1463 sg_len, channel); 1464 1465 for_each_sg(sgl, sg, sg_len, i) { 1466 struct sdma_buffer_descriptor *bd = &desc->bd[i]; 1467 int param; 1468 1469 bd->buffer_addr = sg->dma_address; 1470 1471 count = sg_dma_len(sg); 1472 1473 if (count > SDMA_BD_MAX_CNT) { 1474 dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n", 1475 channel, count, SDMA_BD_MAX_CNT); 1476 goto err_bd_out; 1477 } 1478 1479 bd->mode.count = count; 1480 desc->chn_count += count; 1481 1482 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) 1483 goto err_bd_out; 1484 1485 switch (sdmac->word_size) { 1486 case DMA_SLAVE_BUSWIDTH_4_BYTES: 1487 bd->mode.command = 0; 1488 if (count & 3 || sg->dma_address & 3) 1489 goto err_bd_out; 1490 break; 1491 case DMA_SLAVE_BUSWIDTH_2_BYTES: 1492 bd->mode.command = 2; 1493 if (count & 1 || sg->dma_address & 1) 1494 goto err_bd_out; 1495 break; 1496 case DMA_SLAVE_BUSWIDTH_1_BYTE: 1497 bd->mode.command = 1; 1498 break; 1499 default: 1500 goto err_bd_out; 1501 } 1502 1503 param = BD_DONE | BD_EXTD | BD_CONT; 1504 1505 if (i + 1 == sg_len) { 1506 param |= BD_INTR; 1507 param |= BD_LAST; 1508 param &= ~BD_CONT; 1509 } 1510 1511 dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n", 1512 i, count, (u64)sg->dma_address, 1513 param & BD_WRAP ? "wrap" : "", 1514 param & BD_INTR ? " intr" : ""); 1515 1516 bd->mode.status = param; 1517 } 1518 1519 return vchan_tx_prep(&sdmac->vc, &desc->vd, flags); 1520 err_bd_out: 1521 sdma_free_bd(desc); 1522 kfree(desc); 1523 err_out: 1524 sdmac->status = DMA_ERROR; 1525 return NULL; 1526 } 1527 1528 static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( 1529 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, 1530 size_t period_len, enum dma_transfer_direction direction, 1531 unsigned long flags) 1532 { 1533 struct sdma_channel *sdmac = to_sdma_chan(chan); 1534 struct sdma_engine *sdma = sdmac->sdma; 1535 int num_periods = buf_len / period_len; 1536 int channel = sdmac->channel; 1537 int i = 0, buf = 0; 1538 struct sdma_desc *desc; 1539 1540 dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel); 1541 1542 sdma_config_write(chan, &sdmac->slave_config, direction); 1543 1544 desc = sdma_transfer_init(sdmac, direction, num_periods); 1545 if (!desc) 1546 goto err_out; 1547 1548 desc->period_len = period_len; 1549 1550 sdmac->flags |= IMX_DMA_SG_LOOP; 1551 1552 if (period_len > SDMA_BD_MAX_CNT) { 1553 dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %zu > %d\n", 1554 channel, period_len, SDMA_BD_MAX_CNT); 1555 goto err_bd_out; 1556 } 1557 1558 while (buf < buf_len) { 1559 struct sdma_buffer_descriptor *bd = &desc->bd[i]; 1560 int param; 1561 1562 bd->buffer_addr = dma_addr; 1563 1564 bd->mode.count = period_len; 1565 1566 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) 1567 goto err_bd_out; 1568 if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES) 1569 bd->mode.command = 0; 1570 else 1571 bd->mode.command = sdmac->word_size; 1572 1573 param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR; 1574 if (i + 1 == num_periods) 1575 param |= BD_WRAP; 1576 1577 dev_dbg(sdma->dev, "entry %d: count: %zu dma: %#llx %s%s\n", 1578 i, period_len, (u64)dma_addr, 1579 param & BD_WRAP ? "wrap" : "", 1580 param & BD_INTR ? " intr" : ""); 1581 1582 bd->mode.status = param; 1583 1584 dma_addr += period_len; 1585 buf += period_len; 1586 1587 i++; 1588 } 1589 1590 return vchan_tx_prep(&sdmac->vc, &desc->vd, flags); 1591 err_bd_out: 1592 sdma_free_bd(desc); 1593 kfree(desc); 1594 err_out: 1595 sdmac->status = DMA_ERROR; 1596 return NULL; 1597 } 1598 1599 static int sdma_config_write(struct dma_chan *chan, 1600 struct dma_slave_config *dmaengine_cfg, 1601 enum dma_transfer_direction direction) 1602 { 1603 struct sdma_channel *sdmac = to_sdma_chan(chan); 1604 1605 if (direction == DMA_DEV_TO_MEM) { 1606 sdmac->per_address = dmaengine_cfg->src_addr; 1607 sdmac->watermark_level = dmaengine_cfg->src_maxburst * 1608 dmaengine_cfg->src_addr_width; 1609 sdmac->word_size = dmaengine_cfg->src_addr_width; 1610 } else if (direction == DMA_DEV_TO_DEV) { 1611 sdmac->per_address2 = dmaengine_cfg->src_addr; 1612 sdmac->per_address = dmaengine_cfg->dst_addr; 1613 sdmac->watermark_level = dmaengine_cfg->src_maxburst & 1614 SDMA_WATERMARK_LEVEL_LWML; 1615 sdmac->watermark_level |= (dmaengine_cfg->dst_maxburst << 16) & 1616 SDMA_WATERMARK_LEVEL_HWML; 1617 sdmac->word_size = dmaengine_cfg->dst_addr_width; 1618 } else { 1619 sdmac->per_address = dmaengine_cfg->dst_addr; 1620 sdmac->watermark_level = dmaengine_cfg->dst_maxburst * 1621 dmaengine_cfg->dst_addr_width; 1622 sdmac->word_size = dmaengine_cfg->dst_addr_width; 1623 } 1624 sdmac->direction = direction; 1625 return sdma_config_channel(chan); 1626 } 1627 1628 static int sdma_config(struct dma_chan *chan, 1629 struct dma_slave_config *dmaengine_cfg) 1630 { 1631 struct sdma_channel *sdmac = to_sdma_chan(chan); 1632 1633 memcpy(&sdmac->slave_config, dmaengine_cfg, sizeof(*dmaengine_cfg)); 1634 1635 /* Set ENBLn earlier to make sure dma request triggered after that */ 1636 if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events) 1637 return -EINVAL; 1638 sdma_event_enable(sdmac, sdmac->event_id0); 1639 1640 if (sdmac->event_id1) { 1641 if (sdmac->event_id1 >= sdmac->sdma->drvdata->num_events) 1642 return -EINVAL; 1643 sdma_event_enable(sdmac, sdmac->event_id1); 1644 } 1645 1646 return 0; 1647 } 1648 1649 static enum dma_status sdma_tx_status(struct dma_chan *chan, 1650 dma_cookie_t cookie, 1651 struct dma_tx_state *txstate) 1652 { 1653 struct sdma_channel *sdmac = to_sdma_chan(chan); 1654 struct sdma_desc *desc = NULL; 1655 u32 residue; 1656 struct virt_dma_desc *vd; 1657 enum dma_status ret; 1658 unsigned long flags; 1659 1660 ret = dma_cookie_status(chan, cookie, txstate); 1661 if (ret == DMA_COMPLETE || !txstate) 1662 return ret; 1663 1664 spin_lock_irqsave(&sdmac->vc.lock, flags); 1665 1666 vd = vchan_find_desc(&sdmac->vc, cookie); 1667 if (vd) 1668 desc = to_sdma_desc(&vd->tx); 1669 else if (sdmac->desc && sdmac->desc->vd.tx.cookie == cookie) 1670 desc = sdmac->desc; 1671 1672 if (desc) { 1673 if (sdmac->flags & IMX_DMA_SG_LOOP) 1674 residue = (desc->num_bd - desc->buf_ptail) * 1675 desc->period_len - desc->chn_real_count; 1676 else 1677 residue = desc->chn_count - desc->chn_real_count; 1678 } else { 1679 residue = 0; 1680 } 1681 1682 spin_unlock_irqrestore(&sdmac->vc.lock, flags); 1683 1684 dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, 1685 residue); 1686 1687 return sdmac->status; 1688 } 1689 1690 static void sdma_issue_pending(struct dma_chan *chan) 1691 { 1692 struct sdma_channel *sdmac = to_sdma_chan(chan); 1693 unsigned long flags; 1694 1695 spin_lock_irqsave(&sdmac->vc.lock, flags); 1696 if (vchan_issue_pending(&sdmac->vc) && !sdmac->desc) 1697 sdma_start_desc(sdmac); 1698 spin_unlock_irqrestore(&sdmac->vc.lock, flags); 1699 } 1700 1701 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34 1702 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2 38 1703 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 41 1704 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V4 42 1705 1706 static void sdma_add_scripts(struct sdma_engine *sdma, 1707 const struct sdma_script_start_addrs *addr) 1708 { 1709 s32 *addr_arr = (u32 *)addr; 1710 s32 *saddr_arr = (u32 *)sdma->script_addrs; 1711 int i; 1712 1713 /* use the default firmware in ROM if missing external firmware */ 1714 if (!sdma->script_number) 1715 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; 1716 1717 if (sdma->script_number > sizeof(struct sdma_script_start_addrs) 1718 / sizeof(s32)) { 1719 dev_err(sdma->dev, 1720 "SDMA script number %d not match with firmware.\n", 1721 sdma->script_number); 1722 return; 1723 } 1724 1725 for (i = 0; i < sdma->script_number; i++) 1726 if (addr_arr[i] > 0) 1727 saddr_arr[i] = addr_arr[i]; 1728 } 1729 1730 static void sdma_load_firmware(const struct firmware *fw, void *context) 1731 { 1732 struct sdma_engine *sdma = context; 1733 const struct sdma_firmware_header *header; 1734 const struct sdma_script_start_addrs *addr; 1735 unsigned short *ram_code; 1736 1737 if (!fw) { 1738 dev_info(sdma->dev, "external firmware not found, using ROM firmware\n"); 1739 /* In this case we just use the ROM firmware. */ 1740 return; 1741 } 1742 1743 if (fw->size < sizeof(*header)) 1744 goto err_firmware; 1745 1746 header = (struct sdma_firmware_header *)fw->data; 1747 1748 if (header->magic != SDMA_FIRMWARE_MAGIC) 1749 goto err_firmware; 1750 if (header->ram_code_start + header->ram_code_size > fw->size) 1751 goto err_firmware; 1752 switch (header->version_major) { 1753 case 1: 1754 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; 1755 break; 1756 case 2: 1757 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2; 1758 break; 1759 case 3: 1760 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3; 1761 break; 1762 case 4: 1763 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V4; 1764 break; 1765 default: 1766 dev_err(sdma->dev, "unknown firmware version\n"); 1767 goto err_firmware; 1768 } 1769 1770 addr = (void *)header + header->script_addrs_start; 1771 ram_code = (void *)header + header->ram_code_start; 1772 1773 clk_enable(sdma->clk_ipg); 1774 clk_enable(sdma->clk_ahb); 1775 /* download the RAM image for SDMA */ 1776 sdma_load_script(sdma, ram_code, 1777 header->ram_code_size, 1778 addr->ram_code_start_addr); 1779 clk_disable(sdma->clk_ipg); 1780 clk_disable(sdma->clk_ahb); 1781 1782 sdma_add_scripts(sdma, addr); 1783 1784 dev_info(sdma->dev, "loaded firmware %d.%d\n", 1785 header->version_major, 1786 header->version_minor); 1787 1788 err_firmware: 1789 release_firmware(fw); 1790 } 1791 1792 #define EVENT_REMAP_CELLS 3 1793 1794 static int sdma_event_remap(struct sdma_engine *sdma) 1795 { 1796 struct device_node *np = sdma->dev->of_node; 1797 struct device_node *gpr_np = of_parse_phandle(np, "gpr", 0); 1798 struct property *event_remap; 1799 struct regmap *gpr; 1800 char propname[] = "fsl,sdma-event-remap"; 1801 u32 reg, val, shift, num_map, i; 1802 int ret = 0; 1803 1804 if (IS_ERR(np) || IS_ERR(gpr_np)) 1805 goto out; 1806 1807 event_remap = of_find_property(np, propname, NULL); 1808 num_map = event_remap ? (event_remap->length / sizeof(u32)) : 0; 1809 if (!num_map) { 1810 dev_dbg(sdma->dev, "no event needs to be remapped\n"); 1811 goto out; 1812 } else if (num_map % EVENT_REMAP_CELLS) { 1813 dev_err(sdma->dev, "the property %s must modulo %d\n", 1814 propname, EVENT_REMAP_CELLS); 1815 ret = -EINVAL; 1816 goto out; 1817 } 1818 1819 gpr = syscon_node_to_regmap(gpr_np); 1820 if (IS_ERR(gpr)) { 1821 dev_err(sdma->dev, "failed to get gpr regmap\n"); 1822 ret = PTR_ERR(gpr); 1823 goto out; 1824 } 1825 1826 for (i = 0; i < num_map; i += EVENT_REMAP_CELLS) { 1827 ret = of_property_read_u32_index(np, propname, i, ®); 1828 if (ret) { 1829 dev_err(sdma->dev, "failed to read property %s index %d\n", 1830 propname, i); 1831 goto out; 1832 } 1833 1834 ret = of_property_read_u32_index(np, propname, i + 1, &shift); 1835 if (ret) { 1836 dev_err(sdma->dev, "failed to read property %s index %d\n", 1837 propname, i + 1); 1838 goto out; 1839 } 1840 1841 ret = of_property_read_u32_index(np, propname, i + 2, &val); 1842 if (ret) { 1843 dev_err(sdma->dev, "failed to read property %s index %d\n", 1844 propname, i + 2); 1845 goto out; 1846 } 1847 1848 regmap_update_bits(gpr, reg, BIT(shift), val << shift); 1849 } 1850 1851 out: 1852 if (!IS_ERR(gpr_np)) 1853 of_node_put(gpr_np); 1854 1855 return ret; 1856 } 1857 1858 static int sdma_get_firmware(struct sdma_engine *sdma, 1859 const char *fw_name) 1860 { 1861 int ret; 1862 1863 ret = request_firmware_nowait(THIS_MODULE, 1864 FW_ACTION_HOTPLUG, fw_name, sdma->dev, 1865 GFP_KERNEL, sdma, sdma_load_firmware); 1866 1867 return ret; 1868 } 1869 1870 static int sdma_init(struct sdma_engine *sdma) 1871 { 1872 int i, ret; 1873 dma_addr_t ccb_phys; 1874 1875 ret = clk_enable(sdma->clk_ipg); 1876 if (ret) 1877 return ret; 1878 ret = clk_enable(sdma->clk_ahb); 1879 if (ret) 1880 goto disable_clk_ipg; 1881 1882 if (sdma->drvdata->check_ratio && 1883 (clk_get_rate(sdma->clk_ahb) == clk_get_rate(sdma->clk_ipg))) 1884 sdma->clk_ratio = 1; 1885 1886 /* Be sure SDMA has not started yet */ 1887 writel_relaxed(0, sdma->regs + SDMA_H_C0PTR); 1888 1889 sdma->channel_control = dma_alloc_coherent(sdma->dev, 1890 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) + 1891 sizeof(struct sdma_context_data), 1892 &ccb_phys, GFP_KERNEL); 1893 1894 if (!sdma->channel_control) { 1895 ret = -ENOMEM; 1896 goto err_dma_alloc; 1897 } 1898 1899 sdma->context = (void *)sdma->channel_control + 1900 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); 1901 sdma->context_phys = ccb_phys + 1902 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); 1903 1904 /* disable all channels */ 1905 for (i = 0; i < sdma->drvdata->num_events; i++) 1906 writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i)); 1907 1908 /* All channels have priority 0 */ 1909 for (i = 0; i < MAX_DMA_CHANNELS; i++) 1910 writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4); 1911 1912 ret = sdma_request_channel0(sdma); 1913 if (ret) 1914 goto err_dma_alloc; 1915 1916 sdma_config_ownership(&sdma->channel[0], false, true, false); 1917 1918 /* Set Command Channel (Channel Zero) */ 1919 writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR); 1920 1921 /* Set bits of CONFIG register but with static context switching */ 1922 if (sdma->clk_ratio) 1923 writel_relaxed(SDMA_H_CONFIG_ACR, sdma->regs + SDMA_H_CONFIG); 1924 else 1925 writel_relaxed(0, sdma->regs + SDMA_H_CONFIG); 1926 1927 writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR); 1928 1929 /* Initializes channel's priorities */ 1930 sdma_set_channel_priority(&sdma->channel[0], 7); 1931 1932 clk_disable(sdma->clk_ipg); 1933 clk_disable(sdma->clk_ahb); 1934 1935 return 0; 1936 1937 err_dma_alloc: 1938 clk_disable(sdma->clk_ahb); 1939 disable_clk_ipg: 1940 clk_disable(sdma->clk_ipg); 1941 dev_err(sdma->dev, "initialisation failed with %d\n", ret); 1942 return ret; 1943 } 1944 1945 static bool sdma_filter_fn(struct dma_chan *chan, void *fn_param) 1946 { 1947 struct sdma_channel *sdmac = to_sdma_chan(chan); 1948 struct imx_dma_data *data = fn_param; 1949 1950 if (!imx_dma_is_general_purpose(chan)) 1951 return false; 1952 1953 sdmac->data = *data; 1954 chan->private = &sdmac->data; 1955 1956 return true; 1957 } 1958 1959 static struct dma_chan *sdma_xlate(struct of_phandle_args *dma_spec, 1960 struct of_dma *ofdma) 1961 { 1962 struct sdma_engine *sdma = ofdma->of_dma_data; 1963 dma_cap_mask_t mask = sdma->dma_device.cap_mask; 1964 struct imx_dma_data data; 1965 1966 if (dma_spec->args_count != 3) 1967 return NULL; 1968 1969 data.dma_request = dma_spec->args[0]; 1970 data.peripheral_type = dma_spec->args[1]; 1971 data.priority = dma_spec->args[2]; 1972 /* 1973 * init dma_request2 to zero, which is not used by the dts. 1974 * For P2P, dma_request2 is init from dma_request_channel(), 1975 * chan->private will point to the imx_dma_data, and in 1976 * device_alloc_chan_resources(), imx_dma_data.dma_request2 will 1977 * be set to sdmac->event_id1. 1978 */ 1979 data.dma_request2 = 0; 1980 1981 return __dma_request_channel(&mask, sdma_filter_fn, &data, 1982 ofdma->of_node); 1983 } 1984 1985 static int sdma_probe(struct platform_device *pdev) 1986 { 1987 const struct of_device_id *of_id = 1988 of_match_device(sdma_dt_ids, &pdev->dev); 1989 struct device_node *np = pdev->dev.of_node; 1990 struct device_node *spba_bus; 1991 const char *fw_name; 1992 int ret; 1993 int irq; 1994 struct resource *iores; 1995 struct resource spba_res; 1996 struct sdma_platform_data *pdata = dev_get_platdata(&pdev->dev); 1997 int i; 1998 struct sdma_engine *sdma; 1999 s32 *saddr_arr; 2000 const struct sdma_driver_data *drvdata = NULL; 2001 2002 if (of_id) 2003 drvdata = of_id->data; 2004 else if (pdev->id_entry) 2005 drvdata = (void *)pdev->id_entry->driver_data; 2006 2007 if (!drvdata) { 2008 dev_err(&pdev->dev, "unable to find driver data\n"); 2009 return -EINVAL; 2010 } 2011 2012 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 2013 if (ret) 2014 return ret; 2015 2016 sdma = devm_kzalloc(&pdev->dev, sizeof(*sdma), GFP_KERNEL); 2017 if (!sdma) 2018 return -ENOMEM; 2019 2020 spin_lock_init(&sdma->channel_0_lock); 2021 2022 sdma->dev = &pdev->dev; 2023 sdma->drvdata = drvdata; 2024 2025 irq = platform_get_irq(pdev, 0); 2026 if (irq < 0) 2027 return irq; 2028 2029 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 2030 sdma->regs = devm_ioremap_resource(&pdev->dev, iores); 2031 if (IS_ERR(sdma->regs)) 2032 return PTR_ERR(sdma->regs); 2033 2034 sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 2035 if (IS_ERR(sdma->clk_ipg)) 2036 return PTR_ERR(sdma->clk_ipg); 2037 2038 sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb"); 2039 if (IS_ERR(sdma->clk_ahb)) 2040 return PTR_ERR(sdma->clk_ahb); 2041 2042 ret = clk_prepare(sdma->clk_ipg); 2043 if (ret) 2044 return ret; 2045 2046 ret = clk_prepare(sdma->clk_ahb); 2047 if (ret) 2048 goto err_clk; 2049 2050 ret = devm_request_irq(&pdev->dev, irq, sdma_int_handler, 0, "sdma", 2051 sdma); 2052 if (ret) 2053 goto err_irq; 2054 2055 sdma->irq = irq; 2056 2057 sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL); 2058 if (!sdma->script_addrs) { 2059 ret = -ENOMEM; 2060 goto err_irq; 2061 } 2062 2063 /* initially no scripts available */ 2064 saddr_arr = (s32 *)sdma->script_addrs; 2065 for (i = 0; i < sizeof(*sdma->script_addrs) / sizeof(s32); i++) 2066 saddr_arr[i] = -EINVAL; 2067 2068 dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); 2069 dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); 2070 dma_cap_set(DMA_MEMCPY, sdma->dma_device.cap_mask); 2071 2072 INIT_LIST_HEAD(&sdma->dma_device.channels); 2073 /* Initialize channel parameters */ 2074 for (i = 0; i < MAX_DMA_CHANNELS; i++) { 2075 struct sdma_channel *sdmac = &sdma->channel[i]; 2076 2077 sdmac->sdma = sdma; 2078 2079 sdmac->channel = i; 2080 sdmac->vc.desc_free = sdma_desc_free; 2081 INIT_WORK(&sdmac->terminate_worker, 2082 sdma_channel_terminate_work); 2083 /* 2084 * Add the channel to the DMAC list. Do not add channel 0 though 2085 * because we need it internally in the SDMA driver. This also means 2086 * that channel 0 in dmaengine counting matches sdma channel 1. 2087 */ 2088 if (i) 2089 vchan_init(&sdmac->vc, &sdma->dma_device); 2090 } 2091 2092 ret = sdma_init(sdma); 2093 if (ret) 2094 goto err_init; 2095 2096 ret = sdma_event_remap(sdma); 2097 if (ret) 2098 goto err_init; 2099 2100 if (sdma->drvdata->script_addrs) 2101 sdma_add_scripts(sdma, sdma->drvdata->script_addrs); 2102 if (pdata && pdata->script_addrs) 2103 sdma_add_scripts(sdma, pdata->script_addrs); 2104 2105 sdma->dma_device.dev = &pdev->dev; 2106 2107 sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources; 2108 sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources; 2109 sdma->dma_device.device_tx_status = sdma_tx_status; 2110 sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg; 2111 sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic; 2112 sdma->dma_device.device_config = sdma_config; 2113 sdma->dma_device.device_terminate_all = sdma_terminate_all; 2114 sdma->dma_device.device_synchronize = sdma_channel_synchronize; 2115 sdma->dma_device.src_addr_widths = SDMA_DMA_BUSWIDTHS; 2116 sdma->dma_device.dst_addr_widths = SDMA_DMA_BUSWIDTHS; 2117 sdma->dma_device.directions = SDMA_DMA_DIRECTIONS; 2118 sdma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; 2119 sdma->dma_device.device_prep_dma_memcpy = sdma_prep_memcpy; 2120 sdma->dma_device.device_issue_pending = sdma_issue_pending; 2121 sdma->dma_device.dev->dma_parms = &sdma->dma_parms; 2122 sdma->dma_device.copy_align = 2; 2123 dma_set_max_seg_size(sdma->dma_device.dev, SDMA_BD_MAX_CNT); 2124 2125 platform_set_drvdata(pdev, sdma); 2126 2127 ret = dma_async_device_register(&sdma->dma_device); 2128 if (ret) { 2129 dev_err(&pdev->dev, "unable to register\n"); 2130 goto err_init; 2131 } 2132 2133 if (np) { 2134 ret = of_dma_controller_register(np, sdma_xlate, sdma); 2135 if (ret) { 2136 dev_err(&pdev->dev, "failed to register controller\n"); 2137 goto err_register; 2138 } 2139 2140 spba_bus = of_find_compatible_node(NULL, NULL, "fsl,spba-bus"); 2141 ret = of_address_to_resource(spba_bus, 0, &spba_res); 2142 if (!ret) { 2143 sdma->spba_start_addr = spba_res.start; 2144 sdma->spba_end_addr = spba_res.end; 2145 } 2146 of_node_put(spba_bus); 2147 } 2148 2149 /* 2150 * Kick off firmware loading as the very last step: 2151 * attempt to load firmware only if we're not on the error path, because 2152 * the firmware callback requires a fully functional and allocated sdma 2153 * instance. 2154 */ 2155 if (pdata) { 2156 ret = sdma_get_firmware(sdma, pdata->fw_name); 2157 if (ret) 2158 dev_warn(&pdev->dev, "failed to get firmware from platform data\n"); 2159 } else { 2160 /* 2161 * Because that device tree does not encode ROM script address, 2162 * the RAM script in firmware is mandatory for device tree 2163 * probe, otherwise it fails. 2164 */ 2165 ret = of_property_read_string(np, "fsl,sdma-ram-script-name", 2166 &fw_name); 2167 if (ret) { 2168 dev_warn(&pdev->dev, "failed to get firmware name\n"); 2169 } else { 2170 ret = sdma_get_firmware(sdma, fw_name); 2171 if (ret) 2172 dev_warn(&pdev->dev, "failed to get firmware from device tree\n"); 2173 } 2174 } 2175 2176 return 0; 2177 2178 err_register: 2179 dma_async_device_unregister(&sdma->dma_device); 2180 err_init: 2181 kfree(sdma->script_addrs); 2182 err_irq: 2183 clk_unprepare(sdma->clk_ahb); 2184 err_clk: 2185 clk_unprepare(sdma->clk_ipg); 2186 return ret; 2187 } 2188 2189 static int sdma_remove(struct platform_device *pdev) 2190 { 2191 struct sdma_engine *sdma = platform_get_drvdata(pdev); 2192 int i; 2193 2194 devm_free_irq(&pdev->dev, sdma->irq, sdma); 2195 dma_async_device_unregister(&sdma->dma_device); 2196 kfree(sdma->script_addrs); 2197 clk_unprepare(sdma->clk_ahb); 2198 clk_unprepare(sdma->clk_ipg); 2199 /* Kill the tasklet */ 2200 for (i = 0; i < MAX_DMA_CHANNELS; i++) { 2201 struct sdma_channel *sdmac = &sdma->channel[i]; 2202 2203 tasklet_kill(&sdmac->vc.task); 2204 sdma_free_chan_resources(&sdmac->vc.chan); 2205 } 2206 2207 platform_set_drvdata(pdev, NULL); 2208 return 0; 2209 } 2210 2211 static struct platform_driver sdma_driver = { 2212 .driver = { 2213 .name = "imx-sdma", 2214 .of_match_table = sdma_dt_ids, 2215 }, 2216 .id_table = sdma_devtypes, 2217 .remove = sdma_remove, 2218 .probe = sdma_probe, 2219 }; 2220 2221 module_platform_driver(sdma_driver); 2222 2223 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>"); 2224 MODULE_DESCRIPTION("i.MX SDMA driver"); 2225 #if IS_ENABLED(CONFIG_SOC_IMX6Q) 2226 MODULE_FIRMWARE("imx/sdma/sdma-imx6q.bin"); 2227 #endif 2228 #if IS_ENABLED(CONFIG_SOC_IMX7D) 2229 MODULE_FIRMWARE("imx/sdma/sdma-imx7d.bin"); 2230 #endif 2231 MODULE_LICENSE("GPL"); 2232