1 /* 2 * drivers/dma/imx-sdma.c 3 * 4 * This file contains a driver for the Freescale Smart DMA engine 5 * 6 * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> 7 * 8 * Based on code from Freescale: 9 * 10 * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved. 11 * 12 * The code contained herein is licensed under the GNU General Public 13 * License. You may obtain a copy of the GNU General Public License 14 * Version 2 or later at the following locations: 15 * 16 * http://www.opensource.org/licenses/gpl-license.html 17 * http://www.gnu.org/copyleft/gpl.html 18 */ 19 20 #include <linux/init.h> 21 #include <linux/module.h> 22 #include <linux/types.h> 23 #include <linux/bitops.h> 24 #include <linux/mm.h> 25 #include <linux/interrupt.h> 26 #include <linux/clk.h> 27 #include <linux/delay.h> 28 #include <linux/sched.h> 29 #include <linux/semaphore.h> 30 #include <linux/spinlock.h> 31 #include <linux/device.h> 32 #include <linux/dma-mapping.h> 33 #include <linux/firmware.h> 34 #include <linux/slab.h> 35 #include <linux/platform_device.h> 36 #include <linux/dmaengine.h> 37 #include <linux/of.h> 38 #include <linux/of_device.h> 39 #include <linux/of_dma.h> 40 41 #include <asm/irq.h> 42 #include <linux/platform_data/dma-imx-sdma.h> 43 #include <linux/platform_data/dma-imx.h> 44 45 #include "dmaengine.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 * Mode/Count of data node descriptors - IPCv2 128 */ 129 struct sdma_mode_count { 130 u32 count : 16; /* size of the buffer pointed by this BD */ 131 u32 status : 8; /* E,R,I,C,W,D status bits stored here */ 132 u32 command : 8; /* command mostlky used for channel 0 */ 133 }; 134 135 /* 136 * Buffer descriptor 137 */ 138 struct sdma_buffer_descriptor { 139 struct sdma_mode_count mode; 140 u32 buffer_addr; /* address of the buffer described */ 141 u32 ext_buffer_addr; /* extended buffer address */ 142 } __attribute__ ((packed)); 143 144 /** 145 * struct sdma_channel_control - Channel control Block 146 * 147 * @current_bd_ptr current buffer descriptor processed 148 * @base_bd_ptr first element of buffer descriptor array 149 * @unused padding. The SDMA engine expects an array of 128 byte 150 * control blocks 151 */ 152 struct sdma_channel_control { 153 u32 current_bd_ptr; 154 u32 base_bd_ptr; 155 u32 unused[2]; 156 } __attribute__ ((packed)); 157 158 /** 159 * struct sdma_state_registers - SDMA context for a channel 160 * 161 * @pc: program counter 162 * @t: test bit: status of arithmetic & test instruction 163 * @rpc: return program counter 164 * @sf: source fault while loading data 165 * @spc: loop start program counter 166 * @df: destination fault while storing data 167 * @epc: loop end program counter 168 * @lm: loop mode 169 */ 170 struct sdma_state_registers { 171 u32 pc :14; 172 u32 unused1: 1; 173 u32 t : 1; 174 u32 rpc :14; 175 u32 unused0: 1; 176 u32 sf : 1; 177 u32 spc :14; 178 u32 unused2: 1; 179 u32 df : 1; 180 u32 epc :14; 181 u32 lm : 2; 182 } __attribute__ ((packed)); 183 184 /** 185 * struct sdma_context_data - sdma context specific to a channel 186 * 187 * @channel_state: channel state bits 188 * @gReg: general registers 189 * @mda: burst dma destination address register 190 * @msa: burst dma source address register 191 * @ms: burst dma status register 192 * @md: burst dma data register 193 * @pda: peripheral dma destination address register 194 * @psa: peripheral dma source address register 195 * @ps: peripheral dma status register 196 * @pd: peripheral dma data register 197 * @ca: CRC polynomial register 198 * @cs: CRC accumulator register 199 * @dda: dedicated core destination address register 200 * @dsa: dedicated core source address register 201 * @ds: dedicated core status register 202 * @dd: dedicated core data register 203 */ 204 struct sdma_context_data { 205 struct sdma_state_registers channel_state; 206 u32 gReg[8]; 207 u32 mda; 208 u32 msa; 209 u32 ms; 210 u32 md; 211 u32 pda; 212 u32 psa; 213 u32 ps; 214 u32 pd; 215 u32 ca; 216 u32 cs; 217 u32 dda; 218 u32 dsa; 219 u32 ds; 220 u32 dd; 221 u32 scratch0; 222 u32 scratch1; 223 u32 scratch2; 224 u32 scratch3; 225 u32 scratch4; 226 u32 scratch5; 227 u32 scratch6; 228 u32 scratch7; 229 } __attribute__ ((packed)); 230 231 #define NUM_BD (int)(PAGE_SIZE / sizeof(struct sdma_buffer_descriptor)) 232 233 struct sdma_engine; 234 235 /** 236 * struct sdma_channel - housekeeping for a SDMA channel 237 * 238 * @sdma pointer to the SDMA engine for this channel 239 * @channel the channel number, matches dmaengine chan_id + 1 240 * @direction transfer type. Needed for setting SDMA script 241 * @peripheral_type Peripheral type. Needed for setting SDMA script 242 * @event_id0 aka dma request line 243 * @event_id1 for channels that use 2 events 244 * @word_size peripheral access size 245 * @buf_tail ID of the buffer that was processed 246 * @num_bd max NUM_BD. number of descriptors currently handling 247 */ 248 struct sdma_channel { 249 struct sdma_engine *sdma; 250 unsigned int channel; 251 enum dma_transfer_direction direction; 252 enum sdma_peripheral_type peripheral_type; 253 unsigned int event_id0; 254 unsigned int event_id1; 255 enum dma_slave_buswidth word_size; 256 unsigned int buf_tail; 257 unsigned int num_bd; 258 unsigned int period_len; 259 struct sdma_buffer_descriptor *bd; 260 dma_addr_t bd_phys; 261 unsigned int pc_from_device, pc_to_device; 262 unsigned long flags; 263 dma_addr_t per_address; 264 unsigned long event_mask[2]; 265 unsigned long watermark_level; 266 u32 shp_addr, per_addr; 267 struct dma_chan chan; 268 spinlock_t lock; 269 struct dma_async_tx_descriptor desc; 270 enum dma_status status; 271 unsigned int chn_count; 272 unsigned int chn_real_count; 273 struct tasklet_struct tasklet; 274 struct imx_dma_data data; 275 }; 276 277 #define IMX_DMA_SG_LOOP BIT(0) 278 279 #define MAX_DMA_CHANNELS 32 280 #define MXC_SDMA_DEFAULT_PRIORITY 1 281 #define MXC_SDMA_MIN_PRIORITY 1 282 #define MXC_SDMA_MAX_PRIORITY 7 283 284 #define SDMA_FIRMWARE_MAGIC 0x414d4453 285 286 /** 287 * struct sdma_firmware_header - Layout of the firmware image 288 * 289 * @magic "SDMA" 290 * @version_major increased whenever layout of struct sdma_script_start_addrs 291 * changes. 292 * @version_minor firmware minor version (for binary compatible changes) 293 * @script_addrs_start offset of struct sdma_script_start_addrs in this image 294 * @num_script_addrs Number of script addresses in this image 295 * @ram_code_start offset of SDMA ram image in this firmware image 296 * @ram_code_size size of SDMA ram image 297 * @script_addrs Stores the start address of the SDMA scripts 298 * (in SDMA memory space) 299 */ 300 struct sdma_firmware_header { 301 u32 magic; 302 u32 version_major; 303 u32 version_minor; 304 u32 script_addrs_start; 305 u32 num_script_addrs; 306 u32 ram_code_start; 307 u32 ram_code_size; 308 }; 309 310 struct sdma_driver_data { 311 int chnenbl0; 312 int num_events; 313 struct sdma_script_start_addrs *script_addrs; 314 }; 315 316 struct sdma_engine { 317 struct device *dev; 318 struct device_dma_parameters dma_parms; 319 struct sdma_channel channel[MAX_DMA_CHANNELS]; 320 struct sdma_channel_control *channel_control; 321 void __iomem *regs; 322 struct sdma_context_data *context; 323 dma_addr_t context_phys; 324 struct dma_device dma_device; 325 struct clk *clk_ipg; 326 struct clk *clk_ahb; 327 spinlock_t channel_0_lock; 328 u32 script_number; 329 struct sdma_script_start_addrs *script_addrs; 330 const struct sdma_driver_data *drvdata; 331 }; 332 333 static struct sdma_driver_data sdma_imx31 = { 334 .chnenbl0 = SDMA_CHNENBL0_IMX31, 335 .num_events = 32, 336 }; 337 338 static struct sdma_script_start_addrs sdma_script_imx25 = { 339 .ap_2_ap_addr = 729, 340 .uart_2_mcu_addr = 904, 341 .per_2_app_addr = 1255, 342 .mcu_2_app_addr = 834, 343 .uartsh_2_mcu_addr = 1120, 344 .per_2_shp_addr = 1329, 345 .mcu_2_shp_addr = 1048, 346 .ata_2_mcu_addr = 1560, 347 .mcu_2_ata_addr = 1479, 348 .app_2_per_addr = 1189, 349 .app_2_mcu_addr = 770, 350 .shp_2_per_addr = 1407, 351 .shp_2_mcu_addr = 979, 352 }; 353 354 static struct sdma_driver_data sdma_imx25 = { 355 .chnenbl0 = SDMA_CHNENBL0_IMX35, 356 .num_events = 48, 357 .script_addrs = &sdma_script_imx25, 358 }; 359 360 static struct sdma_driver_data sdma_imx35 = { 361 .chnenbl0 = SDMA_CHNENBL0_IMX35, 362 .num_events = 48, 363 }; 364 365 static struct sdma_script_start_addrs sdma_script_imx51 = { 366 .ap_2_ap_addr = 642, 367 .uart_2_mcu_addr = 817, 368 .mcu_2_app_addr = 747, 369 .mcu_2_shp_addr = 961, 370 .ata_2_mcu_addr = 1473, 371 .mcu_2_ata_addr = 1392, 372 .app_2_per_addr = 1033, 373 .app_2_mcu_addr = 683, 374 .shp_2_per_addr = 1251, 375 .shp_2_mcu_addr = 892, 376 }; 377 378 static struct sdma_driver_data sdma_imx51 = { 379 .chnenbl0 = SDMA_CHNENBL0_IMX35, 380 .num_events = 48, 381 .script_addrs = &sdma_script_imx51, 382 }; 383 384 static struct sdma_script_start_addrs sdma_script_imx53 = { 385 .ap_2_ap_addr = 642, 386 .app_2_mcu_addr = 683, 387 .mcu_2_app_addr = 747, 388 .uart_2_mcu_addr = 817, 389 .shp_2_mcu_addr = 891, 390 .mcu_2_shp_addr = 960, 391 .uartsh_2_mcu_addr = 1032, 392 .spdif_2_mcu_addr = 1100, 393 .mcu_2_spdif_addr = 1134, 394 .firi_2_mcu_addr = 1193, 395 .mcu_2_firi_addr = 1290, 396 }; 397 398 static struct sdma_driver_data sdma_imx53 = { 399 .chnenbl0 = SDMA_CHNENBL0_IMX35, 400 .num_events = 48, 401 .script_addrs = &sdma_script_imx53, 402 }; 403 404 static struct sdma_script_start_addrs sdma_script_imx6q = { 405 .ap_2_ap_addr = 642, 406 .uart_2_mcu_addr = 817, 407 .mcu_2_app_addr = 747, 408 .per_2_per_addr = 6331, 409 .uartsh_2_mcu_addr = 1032, 410 .mcu_2_shp_addr = 960, 411 .app_2_mcu_addr = 683, 412 .shp_2_mcu_addr = 891, 413 .spdif_2_mcu_addr = 1100, 414 .mcu_2_spdif_addr = 1134, 415 }; 416 417 static struct sdma_driver_data sdma_imx6q = { 418 .chnenbl0 = SDMA_CHNENBL0_IMX35, 419 .num_events = 48, 420 .script_addrs = &sdma_script_imx6q, 421 }; 422 423 static struct platform_device_id sdma_devtypes[] = { 424 { 425 .name = "imx25-sdma", 426 .driver_data = (unsigned long)&sdma_imx25, 427 }, { 428 .name = "imx31-sdma", 429 .driver_data = (unsigned long)&sdma_imx31, 430 }, { 431 .name = "imx35-sdma", 432 .driver_data = (unsigned long)&sdma_imx35, 433 }, { 434 .name = "imx51-sdma", 435 .driver_data = (unsigned long)&sdma_imx51, 436 }, { 437 .name = "imx53-sdma", 438 .driver_data = (unsigned long)&sdma_imx53, 439 }, { 440 .name = "imx6q-sdma", 441 .driver_data = (unsigned long)&sdma_imx6q, 442 }, { 443 /* sentinel */ 444 } 445 }; 446 MODULE_DEVICE_TABLE(platform, sdma_devtypes); 447 448 static const struct of_device_id sdma_dt_ids[] = { 449 { .compatible = "fsl,imx6q-sdma", .data = &sdma_imx6q, }, 450 { .compatible = "fsl,imx53-sdma", .data = &sdma_imx53, }, 451 { .compatible = "fsl,imx51-sdma", .data = &sdma_imx51, }, 452 { .compatible = "fsl,imx35-sdma", .data = &sdma_imx35, }, 453 { .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, }, 454 { .compatible = "fsl,imx25-sdma", .data = &sdma_imx25, }, 455 { /* sentinel */ } 456 }; 457 MODULE_DEVICE_TABLE(of, sdma_dt_ids); 458 459 #define SDMA_H_CONFIG_DSPDMA BIT(12) /* indicates if the DSPDMA is used */ 460 #define SDMA_H_CONFIG_RTD_PINS BIT(11) /* indicates if Real-Time Debug pins are enabled */ 461 #define SDMA_H_CONFIG_ACR BIT(4) /* indicates if AHB freq /core freq = 2 or 1 */ 462 #define SDMA_H_CONFIG_CSM (3) /* indicates which context switch mode is selected*/ 463 464 static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event) 465 { 466 u32 chnenbl0 = sdma->drvdata->chnenbl0; 467 return chnenbl0 + event * 4; 468 } 469 470 static int sdma_config_ownership(struct sdma_channel *sdmac, 471 bool event_override, bool mcu_override, bool dsp_override) 472 { 473 struct sdma_engine *sdma = sdmac->sdma; 474 int channel = sdmac->channel; 475 unsigned long evt, mcu, dsp; 476 477 if (event_override && mcu_override && dsp_override) 478 return -EINVAL; 479 480 evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR); 481 mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR); 482 dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR); 483 484 if (dsp_override) 485 __clear_bit(channel, &dsp); 486 else 487 __set_bit(channel, &dsp); 488 489 if (event_override) 490 __clear_bit(channel, &evt); 491 else 492 __set_bit(channel, &evt); 493 494 if (mcu_override) 495 __clear_bit(channel, &mcu); 496 else 497 __set_bit(channel, &mcu); 498 499 writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR); 500 writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR); 501 writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR); 502 503 return 0; 504 } 505 506 static void sdma_enable_channel(struct sdma_engine *sdma, int channel) 507 { 508 writel(BIT(channel), sdma->regs + SDMA_H_START); 509 } 510 511 /* 512 * sdma_run_channel0 - run a channel and wait till it's done 513 */ 514 static int sdma_run_channel0(struct sdma_engine *sdma) 515 { 516 int ret; 517 unsigned long timeout = 500; 518 519 sdma_enable_channel(sdma, 0); 520 521 while (!(ret = readl_relaxed(sdma->regs + SDMA_H_INTR) & 1)) { 522 if (timeout-- <= 0) 523 break; 524 udelay(1); 525 } 526 527 if (ret) { 528 /* Clear the interrupt status */ 529 writel_relaxed(ret, sdma->regs + SDMA_H_INTR); 530 } else { 531 dev_err(sdma->dev, "Timeout waiting for CH0 ready\n"); 532 } 533 534 /* Set bits of CONFIG register with dynamic context switching */ 535 if (readl(sdma->regs + SDMA_H_CONFIG) == 0) 536 writel_relaxed(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG); 537 538 return ret ? 0 : -ETIMEDOUT; 539 } 540 541 static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size, 542 u32 address) 543 { 544 struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; 545 void *buf_virt; 546 dma_addr_t buf_phys; 547 int ret; 548 unsigned long flags; 549 550 buf_virt = dma_alloc_coherent(NULL, 551 size, 552 &buf_phys, GFP_KERNEL); 553 if (!buf_virt) { 554 return -ENOMEM; 555 } 556 557 spin_lock_irqsave(&sdma->channel_0_lock, flags); 558 559 bd0->mode.command = C0_SETPM; 560 bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; 561 bd0->mode.count = size / 2; 562 bd0->buffer_addr = buf_phys; 563 bd0->ext_buffer_addr = address; 564 565 memcpy(buf_virt, buf, size); 566 567 ret = sdma_run_channel0(sdma); 568 569 spin_unlock_irqrestore(&sdma->channel_0_lock, flags); 570 571 dma_free_coherent(NULL, size, buf_virt, buf_phys); 572 573 return ret; 574 } 575 576 static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event) 577 { 578 struct sdma_engine *sdma = sdmac->sdma; 579 int channel = sdmac->channel; 580 unsigned long val; 581 u32 chnenbl = chnenbl_ofs(sdma, event); 582 583 val = readl_relaxed(sdma->regs + chnenbl); 584 __set_bit(channel, &val); 585 writel_relaxed(val, sdma->regs + chnenbl); 586 } 587 588 static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event) 589 { 590 struct sdma_engine *sdma = sdmac->sdma; 591 int channel = sdmac->channel; 592 u32 chnenbl = chnenbl_ofs(sdma, event); 593 unsigned long val; 594 595 val = readl_relaxed(sdma->regs + chnenbl); 596 __clear_bit(channel, &val); 597 writel_relaxed(val, sdma->regs + chnenbl); 598 } 599 600 static void sdma_handle_channel_loop(struct sdma_channel *sdmac) 601 { 602 if (sdmac->desc.callback) 603 sdmac->desc.callback(sdmac->desc.callback_param); 604 } 605 606 static void sdma_update_channel_loop(struct sdma_channel *sdmac) 607 { 608 struct sdma_buffer_descriptor *bd; 609 610 /* 611 * loop mode. Iterate over descriptors, re-setup them and 612 * call callback function. 613 */ 614 while (1) { 615 bd = &sdmac->bd[sdmac->buf_tail]; 616 617 if (bd->mode.status & BD_DONE) 618 break; 619 620 if (bd->mode.status & BD_RROR) 621 sdmac->status = DMA_ERROR; 622 623 bd->mode.status |= BD_DONE; 624 sdmac->buf_tail++; 625 sdmac->buf_tail %= sdmac->num_bd; 626 } 627 } 628 629 static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac) 630 { 631 struct sdma_buffer_descriptor *bd; 632 int i, error = 0; 633 634 sdmac->chn_real_count = 0; 635 /* 636 * non loop mode. Iterate over all descriptors, collect 637 * errors and call callback function 638 */ 639 for (i = 0; i < sdmac->num_bd; i++) { 640 bd = &sdmac->bd[i]; 641 642 if (bd->mode.status & (BD_DONE | BD_RROR)) 643 error = -EIO; 644 sdmac->chn_real_count += bd->mode.count; 645 } 646 647 if (error) 648 sdmac->status = DMA_ERROR; 649 else 650 sdmac->status = DMA_COMPLETE; 651 652 dma_cookie_complete(&sdmac->desc); 653 if (sdmac->desc.callback) 654 sdmac->desc.callback(sdmac->desc.callback_param); 655 } 656 657 static void sdma_tasklet(unsigned long data) 658 { 659 struct sdma_channel *sdmac = (struct sdma_channel *) data; 660 661 if (sdmac->flags & IMX_DMA_SG_LOOP) 662 sdma_handle_channel_loop(sdmac); 663 else 664 mxc_sdma_handle_channel_normal(sdmac); 665 } 666 667 static irqreturn_t sdma_int_handler(int irq, void *dev_id) 668 { 669 struct sdma_engine *sdma = dev_id; 670 unsigned long stat; 671 672 stat = readl_relaxed(sdma->regs + SDMA_H_INTR); 673 /* not interested in channel 0 interrupts */ 674 stat &= ~1; 675 writel_relaxed(stat, sdma->regs + SDMA_H_INTR); 676 677 while (stat) { 678 int channel = fls(stat) - 1; 679 struct sdma_channel *sdmac = &sdma->channel[channel]; 680 681 if (sdmac->flags & IMX_DMA_SG_LOOP) 682 sdma_update_channel_loop(sdmac); 683 684 tasklet_schedule(&sdmac->tasklet); 685 686 __clear_bit(channel, &stat); 687 } 688 689 return IRQ_HANDLED; 690 } 691 692 /* 693 * sets the pc of SDMA script according to the peripheral type 694 */ 695 static void sdma_get_pc(struct sdma_channel *sdmac, 696 enum sdma_peripheral_type peripheral_type) 697 { 698 struct sdma_engine *sdma = sdmac->sdma; 699 int per_2_emi = 0, emi_2_per = 0; 700 /* 701 * These are needed once we start to support transfers between 702 * two peripherals or memory-to-memory transfers 703 */ 704 int per_2_per = 0, emi_2_emi = 0; 705 706 sdmac->pc_from_device = 0; 707 sdmac->pc_to_device = 0; 708 709 switch (peripheral_type) { 710 case IMX_DMATYPE_MEMORY: 711 emi_2_emi = sdma->script_addrs->ap_2_ap_addr; 712 break; 713 case IMX_DMATYPE_DSP: 714 emi_2_per = sdma->script_addrs->bp_2_ap_addr; 715 per_2_emi = sdma->script_addrs->ap_2_bp_addr; 716 break; 717 case IMX_DMATYPE_FIRI: 718 per_2_emi = sdma->script_addrs->firi_2_mcu_addr; 719 emi_2_per = sdma->script_addrs->mcu_2_firi_addr; 720 break; 721 case IMX_DMATYPE_UART: 722 per_2_emi = sdma->script_addrs->uart_2_mcu_addr; 723 emi_2_per = sdma->script_addrs->mcu_2_app_addr; 724 break; 725 case IMX_DMATYPE_UART_SP: 726 per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr; 727 emi_2_per = sdma->script_addrs->mcu_2_shp_addr; 728 break; 729 case IMX_DMATYPE_ATA: 730 per_2_emi = sdma->script_addrs->ata_2_mcu_addr; 731 emi_2_per = sdma->script_addrs->mcu_2_ata_addr; 732 break; 733 case IMX_DMATYPE_CSPI: 734 case IMX_DMATYPE_EXT: 735 case IMX_DMATYPE_SSI: 736 case IMX_DMATYPE_SAI: 737 per_2_emi = sdma->script_addrs->app_2_mcu_addr; 738 emi_2_per = sdma->script_addrs->mcu_2_app_addr; 739 break; 740 case IMX_DMATYPE_SSI_DUAL: 741 per_2_emi = sdma->script_addrs->ssish_2_mcu_addr; 742 emi_2_per = sdma->script_addrs->mcu_2_ssish_addr; 743 break; 744 case IMX_DMATYPE_SSI_SP: 745 case IMX_DMATYPE_MMC: 746 case IMX_DMATYPE_SDHC: 747 case IMX_DMATYPE_CSPI_SP: 748 case IMX_DMATYPE_ESAI: 749 case IMX_DMATYPE_MSHC_SP: 750 per_2_emi = sdma->script_addrs->shp_2_mcu_addr; 751 emi_2_per = sdma->script_addrs->mcu_2_shp_addr; 752 break; 753 case IMX_DMATYPE_ASRC: 754 per_2_emi = sdma->script_addrs->asrc_2_mcu_addr; 755 emi_2_per = sdma->script_addrs->asrc_2_mcu_addr; 756 per_2_per = sdma->script_addrs->per_2_per_addr; 757 break; 758 case IMX_DMATYPE_ASRC_SP: 759 per_2_emi = sdma->script_addrs->shp_2_mcu_addr; 760 emi_2_per = sdma->script_addrs->mcu_2_shp_addr; 761 per_2_per = sdma->script_addrs->per_2_per_addr; 762 break; 763 case IMX_DMATYPE_MSHC: 764 per_2_emi = sdma->script_addrs->mshc_2_mcu_addr; 765 emi_2_per = sdma->script_addrs->mcu_2_mshc_addr; 766 break; 767 case IMX_DMATYPE_CCM: 768 per_2_emi = sdma->script_addrs->dptc_dvfs_addr; 769 break; 770 case IMX_DMATYPE_SPDIF: 771 per_2_emi = sdma->script_addrs->spdif_2_mcu_addr; 772 emi_2_per = sdma->script_addrs->mcu_2_spdif_addr; 773 break; 774 case IMX_DMATYPE_IPU_MEMORY: 775 emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr; 776 break; 777 default: 778 break; 779 } 780 781 sdmac->pc_from_device = per_2_emi; 782 sdmac->pc_to_device = emi_2_per; 783 } 784 785 static int sdma_load_context(struct sdma_channel *sdmac) 786 { 787 struct sdma_engine *sdma = sdmac->sdma; 788 int channel = sdmac->channel; 789 int load_address; 790 struct sdma_context_data *context = sdma->context; 791 struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; 792 int ret; 793 unsigned long flags; 794 795 if (sdmac->direction == DMA_DEV_TO_MEM) { 796 load_address = sdmac->pc_from_device; 797 } else { 798 load_address = sdmac->pc_to_device; 799 } 800 801 if (load_address < 0) 802 return load_address; 803 804 dev_dbg(sdma->dev, "load_address = %d\n", load_address); 805 dev_dbg(sdma->dev, "wml = 0x%08x\n", (u32)sdmac->watermark_level); 806 dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr); 807 dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr); 808 dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]); 809 dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]); 810 811 spin_lock_irqsave(&sdma->channel_0_lock, flags); 812 813 memset(context, 0, sizeof(*context)); 814 context->channel_state.pc = load_address; 815 816 /* Send by context the event mask,base address for peripheral 817 * and watermark level 818 */ 819 context->gReg[0] = sdmac->event_mask[1]; 820 context->gReg[1] = sdmac->event_mask[0]; 821 context->gReg[2] = sdmac->per_addr; 822 context->gReg[6] = sdmac->shp_addr; 823 context->gReg[7] = sdmac->watermark_level; 824 825 bd0->mode.command = C0_SETDM; 826 bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; 827 bd0->mode.count = sizeof(*context) / 4; 828 bd0->buffer_addr = sdma->context_phys; 829 bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel; 830 ret = sdma_run_channel0(sdma); 831 832 spin_unlock_irqrestore(&sdma->channel_0_lock, flags); 833 834 return ret; 835 } 836 837 static struct sdma_channel *to_sdma_chan(struct dma_chan *chan) 838 { 839 return container_of(chan, struct sdma_channel, chan); 840 } 841 842 static int sdma_disable_channel(struct dma_chan *chan) 843 { 844 struct sdma_channel *sdmac = to_sdma_chan(chan); 845 struct sdma_engine *sdma = sdmac->sdma; 846 int channel = sdmac->channel; 847 848 writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP); 849 sdmac->status = DMA_ERROR; 850 851 return 0; 852 } 853 854 static int sdma_config_channel(struct dma_chan *chan) 855 { 856 struct sdma_channel *sdmac = to_sdma_chan(chan); 857 int ret; 858 859 sdma_disable_channel(chan); 860 861 sdmac->event_mask[0] = 0; 862 sdmac->event_mask[1] = 0; 863 sdmac->shp_addr = 0; 864 sdmac->per_addr = 0; 865 866 if (sdmac->event_id0) { 867 if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events) 868 return -EINVAL; 869 sdma_event_enable(sdmac, sdmac->event_id0); 870 } 871 872 switch (sdmac->peripheral_type) { 873 case IMX_DMATYPE_DSP: 874 sdma_config_ownership(sdmac, false, true, true); 875 break; 876 case IMX_DMATYPE_MEMORY: 877 sdma_config_ownership(sdmac, false, true, false); 878 break; 879 default: 880 sdma_config_ownership(sdmac, true, true, false); 881 break; 882 } 883 884 sdma_get_pc(sdmac, sdmac->peripheral_type); 885 886 if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) && 887 (sdmac->peripheral_type != IMX_DMATYPE_DSP)) { 888 /* Handle multiple event channels differently */ 889 if (sdmac->event_id1) { 890 sdmac->event_mask[1] = BIT(sdmac->event_id1 % 32); 891 if (sdmac->event_id1 > 31) 892 __set_bit(31, &sdmac->watermark_level); 893 sdmac->event_mask[0] = BIT(sdmac->event_id0 % 32); 894 if (sdmac->event_id0 > 31) 895 __set_bit(30, &sdmac->watermark_level); 896 } else { 897 __set_bit(sdmac->event_id0, sdmac->event_mask); 898 } 899 /* Watermark Level */ 900 sdmac->watermark_level |= sdmac->watermark_level; 901 /* Address */ 902 sdmac->shp_addr = sdmac->per_address; 903 } else { 904 sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */ 905 } 906 907 ret = sdma_load_context(sdmac); 908 909 return ret; 910 } 911 912 static int sdma_set_channel_priority(struct sdma_channel *sdmac, 913 unsigned int priority) 914 { 915 struct sdma_engine *sdma = sdmac->sdma; 916 int channel = sdmac->channel; 917 918 if (priority < MXC_SDMA_MIN_PRIORITY 919 || priority > MXC_SDMA_MAX_PRIORITY) { 920 return -EINVAL; 921 } 922 923 writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel); 924 925 return 0; 926 } 927 928 static int sdma_request_channel(struct sdma_channel *sdmac) 929 { 930 struct sdma_engine *sdma = sdmac->sdma; 931 int channel = sdmac->channel; 932 int ret = -EBUSY; 933 934 sdmac->bd = dma_zalloc_coherent(NULL, PAGE_SIZE, &sdmac->bd_phys, 935 GFP_KERNEL); 936 if (!sdmac->bd) { 937 ret = -ENOMEM; 938 goto out; 939 } 940 941 sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys; 942 sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; 943 944 sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY); 945 return 0; 946 out: 947 948 return ret; 949 } 950 951 static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx) 952 { 953 unsigned long flags; 954 struct sdma_channel *sdmac = to_sdma_chan(tx->chan); 955 dma_cookie_t cookie; 956 957 spin_lock_irqsave(&sdmac->lock, flags); 958 959 cookie = dma_cookie_assign(tx); 960 961 spin_unlock_irqrestore(&sdmac->lock, flags); 962 963 return cookie; 964 } 965 966 static int sdma_alloc_chan_resources(struct dma_chan *chan) 967 { 968 struct sdma_channel *sdmac = to_sdma_chan(chan); 969 struct imx_dma_data *data = chan->private; 970 int prio, ret; 971 972 if (!data) 973 return -EINVAL; 974 975 switch (data->priority) { 976 case DMA_PRIO_HIGH: 977 prio = 3; 978 break; 979 case DMA_PRIO_MEDIUM: 980 prio = 2; 981 break; 982 case DMA_PRIO_LOW: 983 default: 984 prio = 1; 985 break; 986 } 987 988 sdmac->peripheral_type = data->peripheral_type; 989 sdmac->event_id0 = data->dma_request; 990 991 clk_enable(sdmac->sdma->clk_ipg); 992 clk_enable(sdmac->sdma->clk_ahb); 993 994 ret = sdma_request_channel(sdmac); 995 if (ret) 996 return ret; 997 998 ret = sdma_set_channel_priority(sdmac, prio); 999 if (ret) 1000 return ret; 1001 1002 dma_async_tx_descriptor_init(&sdmac->desc, chan); 1003 sdmac->desc.tx_submit = sdma_tx_submit; 1004 /* txd.flags will be overwritten in prep funcs */ 1005 sdmac->desc.flags = DMA_CTRL_ACK; 1006 1007 return 0; 1008 } 1009 1010 static void sdma_free_chan_resources(struct dma_chan *chan) 1011 { 1012 struct sdma_channel *sdmac = to_sdma_chan(chan); 1013 struct sdma_engine *sdma = sdmac->sdma; 1014 1015 sdma_disable_channel(chan); 1016 1017 if (sdmac->event_id0) 1018 sdma_event_disable(sdmac, sdmac->event_id0); 1019 if (sdmac->event_id1) 1020 sdma_event_disable(sdmac, sdmac->event_id1); 1021 1022 sdmac->event_id0 = 0; 1023 sdmac->event_id1 = 0; 1024 1025 sdma_set_channel_priority(sdmac, 0); 1026 1027 dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys); 1028 1029 clk_disable(sdma->clk_ipg); 1030 clk_disable(sdma->clk_ahb); 1031 } 1032 1033 static struct dma_async_tx_descriptor *sdma_prep_slave_sg( 1034 struct dma_chan *chan, struct scatterlist *sgl, 1035 unsigned int sg_len, enum dma_transfer_direction direction, 1036 unsigned long flags, void *context) 1037 { 1038 struct sdma_channel *sdmac = to_sdma_chan(chan); 1039 struct sdma_engine *sdma = sdmac->sdma; 1040 int ret, i, count; 1041 int channel = sdmac->channel; 1042 struct scatterlist *sg; 1043 1044 if (sdmac->status == DMA_IN_PROGRESS) 1045 return NULL; 1046 sdmac->status = DMA_IN_PROGRESS; 1047 1048 sdmac->flags = 0; 1049 1050 sdmac->buf_tail = 0; 1051 1052 dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n", 1053 sg_len, channel); 1054 1055 sdmac->direction = direction; 1056 ret = sdma_load_context(sdmac); 1057 if (ret) 1058 goto err_out; 1059 1060 if (sg_len > NUM_BD) { 1061 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", 1062 channel, sg_len, NUM_BD); 1063 ret = -EINVAL; 1064 goto err_out; 1065 } 1066 1067 sdmac->chn_count = 0; 1068 for_each_sg(sgl, sg, sg_len, i) { 1069 struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; 1070 int param; 1071 1072 bd->buffer_addr = sg->dma_address; 1073 1074 count = sg_dma_len(sg); 1075 1076 if (count > 0xffff) { 1077 dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n", 1078 channel, count, 0xffff); 1079 ret = -EINVAL; 1080 goto err_out; 1081 } 1082 1083 bd->mode.count = count; 1084 sdmac->chn_count += count; 1085 1086 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) { 1087 ret = -EINVAL; 1088 goto err_out; 1089 } 1090 1091 switch (sdmac->word_size) { 1092 case DMA_SLAVE_BUSWIDTH_4_BYTES: 1093 bd->mode.command = 0; 1094 if (count & 3 || sg->dma_address & 3) 1095 return NULL; 1096 break; 1097 case DMA_SLAVE_BUSWIDTH_2_BYTES: 1098 bd->mode.command = 2; 1099 if (count & 1 || sg->dma_address & 1) 1100 return NULL; 1101 break; 1102 case DMA_SLAVE_BUSWIDTH_1_BYTE: 1103 bd->mode.command = 1; 1104 break; 1105 default: 1106 return NULL; 1107 } 1108 1109 param = BD_DONE | BD_EXTD | BD_CONT; 1110 1111 if (i + 1 == sg_len) { 1112 param |= BD_INTR; 1113 param |= BD_LAST; 1114 param &= ~BD_CONT; 1115 } 1116 1117 dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n", 1118 i, count, (u64)sg->dma_address, 1119 param & BD_WRAP ? "wrap" : "", 1120 param & BD_INTR ? " intr" : ""); 1121 1122 bd->mode.status = param; 1123 } 1124 1125 sdmac->num_bd = sg_len; 1126 sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; 1127 1128 return &sdmac->desc; 1129 err_out: 1130 sdmac->status = DMA_ERROR; 1131 return NULL; 1132 } 1133 1134 static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( 1135 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, 1136 size_t period_len, enum dma_transfer_direction direction, 1137 unsigned long flags) 1138 { 1139 struct sdma_channel *sdmac = to_sdma_chan(chan); 1140 struct sdma_engine *sdma = sdmac->sdma; 1141 int num_periods = buf_len / period_len; 1142 int channel = sdmac->channel; 1143 int ret, i = 0, buf = 0; 1144 1145 dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel); 1146 1147 if (sdmac->status == DMA_IN_PROGRESS) 1148 return NULL; 1149 1150 sdmac->status = DMA_IN_PROGRESS; 1151 1152 sdmac->buf_tail = 0; 1153 sdmac->period_len = period_len; 1154 1155 sdmac->flags |= IMX_DMA_SG_LOOP; 1156 sdmac->direction = direction; 1157 ret = sdma_load_context(sdmac); 1158 if (ret) 1159 goto err_out; 1160 1161 if (num_periods > NUM_BD) { 1162 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", 1163 channel, num_periods, NUM_BD); 1164 goto err_out; 1165 } 1166 1167 if (period_len > 0xffff) { 1168 dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %d > %d\n", 1169 channel, period_len, 0xffff); 1170 goto err_out; 1171 } 1172 1173 while (buf < buf_len) { 1174 struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; 1175 int param; 1176 1177 bd->buffer_addr = dma_addr; 1178 1179 bd->mode.count = period_len; 1180 1181 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) 1182 goto err_out; 1183 if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES) 1184 bd->mode.command = 0; 1185 else 1186 bd->mode.command = sdmac->word_size; 1187 1188 param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR; 1189 if (i + 1 == num_periods) 1190 param |= BD_WRAP; 1191 1192 dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n", 1193 i, period_len, (u64)dma_addr, 1194 param & BD_WRAP ? "wrap" : "", 1195 param & BD_INTR ? " intr" : ""); 1196 1197 bd->mode.status = param; 1198 1199 dma_addr += period_len; 1200 buf += period_len; 1201 1202 i++; 1203 } 1204 1205 sdmac->num_bd = num_periods; 1206 sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; 1207 1208 return &sdmac->desc; 1209 err_out: 1210 sdmac->status = DMA_ERROR; 1211 return NULL; 1212 } 1213 1214 static int sdma_config(struct dma_chan *chan, 1215 struct dma_slave_config *dmaengine_cfg) 1216 { 1217 struct sdma_channel *sdmac = to_sdma_chan(chan); 1218 1219 if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) { 1220 sdmac->per_address = dmaengine_cfg->src_addr; 1221 sdmac->watermark_level = dmaengine_cfg->src_maxburst * 1222 dmaengine_cfg->src_addr_width; 1223 sdmac->word_size = dmaengine_cfg->src_addr_width; 1224 } else { 1225 sdmac->per_address = dmaengine_cfg->dst_addr; 1226 sdmac->watermark_level = dmaengine_cfg->dst_maxburst * 1227 dmaengine_cfg->dst_addr_width; 1228 sdmac->word_size = dmaengine_cfg->dst_addr_width; 1229 } 1230 sdmac->direction = dmaengine_cfg->direction; 1231 return sdma_config_channel(chan); 1232 } 1233 1234 static enum dma_status sdma_tx_status(struct dma_chan *chan, 1235 dma_cookie_t cookie, 1236 struct dma_tx_state *txstate) 1237 { 1238 struct sdma_channel *sdmac = to_sdma_chan(chan); 1239 u32 residue; 1240 1241 if (sdmac->flags & IMX_DMA_SG_LOOP) 1242 residue = (sdmac->num_bd - sdmac->buf_tail) * sdmac->period_len; 1243 else 1244 residue = sdmac->chn_count - sdmac->chn_real_count; 1245 1246 dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, 1247 residue); 1248 1249 return sdmac->status; 1250 } 1251 1252 static void sdma_issue_pending(struct dma_chan *chan) 1253 { 1254 struct sdma_channel *sdmac = to_sdma_chan(chan); 1255 struct sdma_engine *sdma = sdmac->sdma; 1256 1257 if (sdmac->status == DMA_IN_PROGRESS) 1258 sdma_enable_channel(sdma, sdmac->channel); 1259 } 1260 1261 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34 1262 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2 38 1263 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 41 1264 1265 static void sdma_add_scripts(struct sdma_engine *sdma, 1266 const struct sdma_script_start_addrs *addr) 1267 { 1268 s32 *addr_arr = (u32 *)addr; 1269 s32 *saddr_arr = (u32 *)sdma->script_addrs; 1270 int i; 1271 1272 /* use the default firmware in ROM if missing external firmware */ 1273 if (!sdma->script_number) 1274 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; 1275 1276 for (i = 0; i < sdma->script_number; i++) 1277 if (addr_arr[i] > 0) 1278 saddr_arr[i] = addr_arr[i]; 1279 } 1280 1281 static void sdma_load_firmware(const struct firmware *fw, void *context) 1282 { 1283 struct sdma_engine *sdma = context; 1284 const struct sdma_firmware_header *header; 1285 const struct sdma_script_start_addrs *addr; 1286 unsigned short *ram_code; 1287 1288 if (!fw) { 1289 dev_info(sdma->dev, "external firmware not found, using ROM firmware\n"); 1290 /* In this case we just use the ROM firmware. */ 1291 return; 1292 } 1293 1294 if (fw->size < sizeof(*header)) 1295 goto err_firmware; 1296 1297 header = (struct sdma_firmware_header *)fw->data; 1298 1299 if (header->magic != SDMA_FIRMWARE_MAGIC) 1300 goto err_firmware; 1301 if (header->ram_code_start + header->ram_code_size > fw->size) 1302 goto err_firmware; 1303 switch (header->version_major) { 1304 case 1: 1305 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; 1306 break; 1307 case 2: 1308 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2; 1309 break; 1310 case 3: 1311 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3; 1312 break; 1313 default: 1314 dev_err(sdma->dev, "unknown firmware version\n"); 1315 goto err_firmware; 1316 } 1317 1318 addr = (void *)header + header->script_addrs_start; 1319 ram_code = (void *)header + header->ram_code_start; 1320 1321 clk_enable(sdma->clk_ipg); 1322 clk_enable(sdma->clk_ahb); 1323 /* download the RAM image for SDMA */ 1324 sdma_load_script(sdma, ram_code, 1325 header->ram_code_size, 1326 addr->ram_code_start_addr); 1327 clk_disable(sdma->clk_ipg); 1328 clk_disable(sdma->clk_ahb); 1329 1330 sdma_add_scripts(sdma, addr); 1331 1332 dev_info(sdma->dev, "loaded firmware %d.%d\n", 1333 header->version_major, 1334 header->version_minor); 1335 1336 err_firmware: 1337 release_firmware(fw); 1338 } 1339 1340 static int sdma_get_firmware(struct sdma_engine *sdma, 1341 const char *fw_name) 1342 { 1343 int ret; 1344 1345 ret = request_firmware_nowait(THIS_MODULE, 1346 FW_ACTION_HOTPLUG, fw_name, sdma->dev, 1347 GFP_KERNEL, sdma, sdma_load_firmware); 1348 1349 return ret; 1350 } 1351 1352 static int sdma_init(struct sdma_engine *sdma) 1353 { 1354 int i, ret; 1355 dma_addr_t ccb_phys; 1356 1357 clk_enable(sdma->clk_ipg); 1358 clk_enable(sdma->clk_ahb); 1359 1360 /* Be sure SDMA has not started yet */ 1361 writel_relaxed(0, sdma->regs + SDMA_H_C0PTR); 1362 1363 sdma->channel_control = dma_alloc_coherent(NULL, 1364 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) + 1365 sizeof(struct sdma_context_data), 1366 &ccb_phys, GFP_KERNEL); 1367 1368 if (!sdma->channel_control) { 1369 ret = -ENOMEM; 1370 goto err_dma_alloc; 1371 } 1372 1373 sdma->context = (void *)sdma->channel_control + 1374 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); 1375 sdma->context_phys = ccb_phys + 1376 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); 1377 1378 /* Zero-out the CCB structures array just allocated */ 1379 memset(sdma->channel_control, 0, 1380 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control)); 1381 1382 /* disable all channels */ 1383 for (i = 0; i < sdma->drvdata->num_events; i++) 1384 writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i)); 1385 1386 /* All channels have priority 0 */ 1387 for (i = 0; i < MAX_DMA_CHANNELS; i++) 1388 writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4); 1389 1390 ret = sdma_request_channel(&sdma->channel[0]); 1391 if (ret) 1392 goto err_dma_alloc; 1393 1394 sdma_config_ownership(&sdma->channel[0], false, true, false); 1395 1396 /* Set Command Channel (Channel Zero) */ 1397 writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR); 1398 1399 /* Set bits of CONFIG register but with static context switching */ 1400 /* FIXME: Check whether to set ACR bit depending on clock ratios */ 1401 writel_relaxed(0, sdma->regs + SDMA_H_CONFIG); 1402 1403 writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR); 1404 1405 /* Initializes channel's priorities */ 1406 sdma_set_channel_priority(&sdma->channel[0], 7); 1407 1408 clk_disable(sdma->clk_ipg); 1409 clk_disable(sdma->clk_ahb); 1410 1411 return 0; 1412 1413 err_dma_alloc: 1414 clk_disable(sdma->clk_ipg); 1415 clk_disable(sdma->clk_ahb); 1416 dev_err(sdma->dev, "initialisation failed with %d\n", ret); 1417 return ret; 1418 } 1419 1420 static bool sdma_filter_fn(struct dma_chan *chan, void *fn_param) 1421 { 1422 struct sdma_channel *sdmac = to_sdma_chan(chan); 1423 struct imx_dma_data *data = fn_param; 1424 1425 if (!imx_dma_is_general_purpose(chan)) 1426 return false; 1427 1428 sdmac->data = *data; 1429 chan->private = &sdmac->data; 1430 1431 return true; 1432 } 1433 1434 static struct dma_chan *sdma_xlate(struct of_phandle_args *dma_spec, 1435 struct of_dma *ofdma) 1436 { 1437 struct sdma_engine *sdma = ofdma->of_dma_data; 1438 dma_cap_mask_t mask = sdma->dma_device.cap_mask; 1439 struct imx_dma_data data; 1440 1441 if (dma_spec->args_count != 3) 1442 return NULL; 1443 1444 data.dma_request = dma_spec->args[0]; 1445 data.peripheral_type = dma_spec->args[1]; 1446 data.priority = dma_spec->args[2]; 1447 1448 return dma_request_channel(mask, sdma_filter_fn, &data); 1449 } 1450 1451 static int sdma_probe(struct platform_device *pdev) 1452 { 1453 const struct of_device_id *of_id = 1454 of_match_device(sdma_dt_ids, &pdev->dev); 1455 struct device_node *np = pdev->dev.of_node; 1456 const char *fw_name; 1457 int ret; 1458 int irq; 1459 struct resource *iores; 1460 struct sdma_platform_data *pdata = dev_get_platdata(&pdev->dev); 1461 int i; 1462 struct sdma_engine *sdma; 1463 s32 *saddr_arr; 1464 const struct sdma_driver_data *drvdata = NULL; 1465 1466 if (of_id) 1467 drvdata = of_id->data; 1468 else if (pdev->id_entry) 1469 drvdata = (void *)pdev->id_entry->driver_data; 1470 1471 if (!drvdata) { 1472 dev_err(&pdev->dev, "unable to find driver data\n"); 1473 return -EINVAL; 1474 } 1475 1476 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 1477 if (ret) 1478 return ret; 1479 1480 sdma = devm_kzalloc(&pdev->dev, sizeof(*sdma), GFP_KERNEL); 1481 if (!sdma) 1482 return -ENOMEM; 1483 1484 spin_lock_init(&sdma->channel_0_lock); 1485 1486 sdma->dev = &pdev->dev; 1487 sdma->drvdata = drvdata; 1488 1489 irq = platform_get_irq(pdev, 0); 1490 if (irq < 0) 1491 return irq; 1492 1493 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1494 sdma->regs = devm_ioremap_resource(&pdev->dev, iores); 1495 if (IS_ERR(sdma->regs)) 1496 return PTR_ERR(sdma->regs); 1497 1498 sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 1499 if (IS_ERR(sdma->clk_ipg)) 1500 return PTR_ERR(sdma->clk_ipg); 1501 1502 sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb"); 1503 if (IS_ERR(sdma->clk_ahb)) 1504 return PTR_ERR(sdma->clk_ahb); 1505 1506 clk_prepare(sdma->clk_ipg); 1507 clk_prepare(sdma->clk_ahb); 1508 1509 ret = devm_request_irq(&pdev->dev, irq, sdma_int_handler, 0, "sdma", 1510 sdma); 1511 if (ret) 1512 return ret; 1513 1514 sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL); 1515 if (!sdma->script_addrs) 1516 return -ENOMEM; 1517 1518 /* initially no scripts available */ 1519 saddr_arr = (s32 *)sdma->script_addrs; 1520 for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++) 1521 saddr_arr[i] = -EINVAL; 1522 1523 dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); 1524 dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); 1525 1526 INIT_LIST_HEAD(&sdma->dma_device.channels); 1527 /* Initialize channel parameters */ 1528 for (i = 0; i < MAX_DMA_CHANNELS; i++) { 1529 struct sdma_channel *sdmac = &sdma->channel[i]; 1530 1531 sdmac->sdma = sdma; 1532 spin_lock_init(&sdmac->lock); 1533 1534 sdmac->chan.device = &sdma->dma_device; 1535 dma_cookie_init(&sdmac->chan); 1536 sdmac->channel = i; 1537 1538 tasklet_init(&sdmac->tasklet, sdma_tasklet, 1539 (unsigned long) sdmac); 1540 /* 1541 * Add the channel to the DMAC list. Do not add channel 0 though 1542 * because we need it internally in the SDMA driver. This also means 1543 * that channel 0 in dmaengine counting matches sdma channel 1. 1544 */ 1545 if (i) 1546 list_add_tail(&sdmac->chan.device_node, 1547 &sdma->dma_device.channels); 1548 } 1549 1550 ret = sdma_init(sdma); 1551 if (ret) 1552 goto err_init; 1553 1554 if (sdma->drvdata->script_addrs) 1555 sdma_add_scripts(sdma, sdma->drvdata->script_addrs); 1556 if (pdata && pdata->script_addrs) 1557 sdma_add_scripts(sdma, pdata->script_addrs); 1558 1559 if (pdata) { 1560 ret = sdma_get_firmware(sdma, pdata->fw_name); 1561 if (ret) 1562 dev_warn(&pdev->dev, "failed to get firmware from platform data\n"); 1563 } else { 1564 /* 1565 * Because that device tree does not encode ROM script address, 1566 * the RAM script in firmware is mandatory for device tree 1567 * probe, otherwise it fails. 1568 */ 1569 ret = of_property_read_string(np, "fsl,sdma-ram-script-name", 1570 &fw_name); 1571 if (ret) 1572 dev_warn(&pdev->dev, "failed to get firmware name\n"); 1573 else { 1574 ret = sdma_get_firmware(sdma, fw_name); 1575 if (ret) 1576 dev_warn(&pdev->dev, "failed to get firmware from device tree\n"); 1577 } 1578 } 1579 1580 sdma->dma_device.dev = &pdev->dev; 1581 1582 sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources; 1583 sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources; 1584 sdma->dma_device.device_tx_status = sdma_tx_status; 1585 sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg; 1586 sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic; 1587 sdma->dma_device.device_config = sdma_config; 1588 sdma->dma_device.device_terminate_all = sdma_disable_channel; 1589 sdma->dma_device.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); 1590 sdma->dma_device.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); 1591 sdma->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); 1592 sdma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; 1593 sdma->dma_device.device_issue_pending = sdma_issue_pending; 1594 sdma->dma_device.dev->dma_parms = &sdma->dma_parms; 1595 dma_set_max_seg_size(sdma->dma_device.dev, 65535); 1596 1597 platform_set_drvdata(pdev, sdma); 1598 1599 ret = dma_async_device_register(&sdma->dma_device); 1600 if (ret) { 1601 dev_err(&pdev->dev, "unable to register\n"); 1602 goto err_init; 1603 } 1604 1605 if (np) { 1606 ret = of_dma_controller_register(np, sdma_xlate, sdma); 1607 if (ret) { 1608 dev_err(&pdev->dev, "failed to register controller\n"); 1609 goto err_register; 1610 } 1611 } 1612 1613 dev_info(sdma->dev, "initialized\n"); 1614 1615 return 0; 1616 1617 err_register: 1618 dma_async_device_unregister(&sdma->dma_device); 1619 err_init: 1620 kfree(sdma->script_addrs); 1621 return ret; 1622 } 1623 1624 static int sdma_remove(struct platform_device *pdev) 1625 { 1626 struct sdma_engine *sdma = platform_get_drvdata(pdev); 1627 int i; 1628 1629 dma_async_device_unregister(&sdma->dma_device); 1630 kfree(sdma->script_addrs); 1631 /* Kill the tasklet */ 1632 for (i = 0; i < MAX_DMA_CHANNELS; i++) { 1633 struct sdma_channel *sdmac = &sdma->channel[i]; 1634 1635 tasklet_kill(&sdmac->tasklet); 1636 } 1637 1638 platform_set_drvdata(pdev, NULL); 1639 dev_info(&pdev->dev, "Removed...\n"); 1640 return 0; 1641 } 1642 1643 static struct platform_driver sdma_driver = { 1644 .driver = { 1645 .name = "imx-sdma", 1646 .of_match_table = sdma_dt_ids, 1647 }, 1648 .id_table = sdma_devtypes, 1649 .remove = sdma_remove, 1650 .probe = sdma_probe, 1651 }; 1652 1653 module_platform_driver(sdma_driver); 1654 1655 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>"); 1656 MODULE_DESCRIPTION("i.MX SDMA driver"); 1657 MODULE_LICENSE("GPL"); 1658