drivers/dma/imx-sdma.c

   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
  40 #include <asm/irq.h>
  41 #include <mach/sdma.h>
  42 #include <mach/dma.h>
  43 #include <mach/hardware.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  * @done                channel completion
 247  * @num_bd              max NUM_BD. number of descriptors currently handling
 248  */
 249 struct sdma_channel {
 250         struct sdma_engine              *sdma;
 251         unsigned int                    channel;
 252         enum dma_transfer_direction             direction;
 253         enum sdma_peripheral_type       peripheral_type;
 254         unsigned int                    event_id0;
 255         unsigned int                    event_id1;
 256         enum dma_slave_buswidth         word_size;
 257         unsigned int                    buf_tail;
 258         struct completion               done;
 259         unsigned int                    num_bd;
 260         struct sdma_buffer_descriptor   *bd;
 261         dma_addr_t                      bd_phys;
 262         unsigned int                    pc_from_device, pc_to_device;
 263         unsigned long                   flags;
 264         dma_addr_t                      per_address;
 265         unsigned long                   event_mask[2];
 266         unsigned long                   watermark_level;
 267         u32                             shp_addr, per_addr;
 268         struct dma_chan                 chan;
 269         spinlock_t                      lock;
 270         struct dma_async_tx_descriptor  desc;
 271         enum dma_status                 status;
 272         unsigned int                    chn_count;
 273         unsigned int                    chn_real_count;
 274         struct tasklet_struct           tasklet;
 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 enum sdma_devtype {
 311         IMX31_SDMA,     /* runs on i.mx31 */
 312         IMX35_SDMA,     /* runs on i.mx35 and later */
 313 };
 314
 315 struct sdma_engine {
 316         struct device                   *dev;
 317         struct device_dma_parameters    dma_parms;
 318         struct sdma_channel             channel[MAX_DMA_CHANNELS];
 319         struct sdma_channel_control     *channel_control;
 320         void __iomem                    *regs;
 321         enum sdma_devtype               devtype;
 322         unsigned int                    num_events;
 323         struct sdma_context_data        *context;
 324         dma_addr_t                      context_phys;
 325         struct dma_device               dma_device;
 326         struct clk                      *clk_ipg;
 327         struct clk                      *clk_ahb;
 328         spinlock_t                      channel_0_lock;
 329         struct sdma_script_start_addrs  *script_addrs;
 330 };
 331
 332 static struct platform_device_id sdma_devtypes[] = {
 333         {
 334                 .name = "imx31-sdma",
 335                 .driver_data = IMX31_SDMA,
 336         }, {
 337                 .name = "imx35-sdma",
 338                 .driver_data = IMX35_SDMA,
 339         }, {
 340                 /* sentinel */
 341         }
 342 };
 343 MODULE_DEVICE_TABLE(platform, sdma_devtypes);
 344
 345 static const struct of_device_id sdma_dt_ids[] = {
 346         { .compatible = "fsl,imx31-sdma", .data = &sdma_devtypes[IMX31_SDMA], },
 347         { .compatible = "fsl,imx35-sdma", .data = &sdma_devtypes[IMX35_SDMA], },
 348         { /* sentinel */ }
 349 };
 350 MODULE_DEVICE_TABLE(of, sdma_dt_ids);
 351
 352 #define SDMA_H_CONFIG_DSPDMA    BIT(12) /* indicates if the DSPDMA is used */
 353 #define SDMA_H_CONFIG_RTD_PINS  BIT(11) /* indicates if Real-Time Debug pins are enabled */
 354 #define SDMA_H_CONFIG_ACR       BIT(4)  /* indicates if AHB freq /core freq = 2 or 1 */
 355 #define SDMA_H_CONFIG_CSM       (3)       /* indicates which context switch mode is selected*/
 356
 357 static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event)
 358 {
 359         u32 chnenbl0 = (sdma->devtype == IMX31_SDMA ? SDMA_CHNENBL0_IMX31 :
 360                                                       SDMA_CHNENBL0_IMX35);
 361         return chnenbl0 + event * 4;
 362 }
 363
 364 static int sdma_config_ownership(struct sdma_channel *sdmac,
 365                 bool event_override, bool mcu_override, bool dsp_override)
 366 {
 367         struct sdma_engine *sdma = sdmac->sdma;
 368         int channel = sdmac->channel;
 369         unsigned long evt, mcu, dsp;
 370
 371         if (event_override && mcu_override && dsp_override)
 372                 return -EINVAL;
 373
 374         evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR);
 375         mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR);
 376         dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR);
 377
 378         if (dsp_override)
 379                 __clear_bit(channel, &dsp);
 380         else
 381                 __set_bit(channel, &dsp);
 382
 383         if (event_override)
 384                 __clear_bit(channel, &evt);
 385         else
 386                 __set_bit(channel, &evt);
 387
 388         if (mcu_override)
 389                 __clear_bit(channel, &mcu);
 390         else
 391                 __set_bit(channel, &mcu);
 392
 393         writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR);
 394         writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR);
 395         writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR);
 396
 397         return 0;
 398 }
 399
 400 static void sdma_enable_channel(struct sdma_engine *sdma, int channel)
 401 {
 402         writel(BIT(channel), sdma->regs + SDMA_H_START);
 403 }
 404
 405 /*
 406  * sdma_run_channel0 - run a channel and wait till it's done
 407  */
 408 static int sdma_run_channel0(struct sdma_engine *sdma)
 409 {
 410         int ret;
 411         unsigned long timeout = 500;
 412
 413         sdma_enable_channel(sdma, 0);
 414
 415         while (!(ret = readl_relaxed(sdma->regs + SDMA_H_INTR) & 1)) {
 416                 if (timeout-- <= 0)
 417                         break;
 418                 udelay(1);
 419         }
 420
 421         if (ret) {
 422                 /* Clear the interrupt status */
 423                 writel_relaxed(ret, sdma->regs + SDMA_H_INTR);
 424         } else {
 425                 dev_err(sdma->dev, "Timeout waiting for CH0 ready\n");
 426         }
 427
 428         return ret ? 0 : -ETIMEDOUT;
 429 }
 430
 431 static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
 432                 u32 address)
 433 {
 434         struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
 435         void *buf_virt;
 436         dma_addr_t buf_phys;
 437         int ret;
 438         unsigned long flags;
 439
 440         buf_virt = dma_alloc_coherent(NULL,
 441                         size,
 442                         &buf_phys, GFP_KERNEL);
 443         if (!buf_virt) {
 444                 return -ENOMEM;
 445         }
 446
 447         spin_lock_irqsave(&sdma->channel_0_lock, flags);
 448
 449         bd0->mode.command = C0_SETPM;
 450         bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
 451         bd0->mode.count = size / 2;
 452         bd0->buffer_addr = buf_phys;
 453         bd0->ext_buffer_addr = address;
 454
 455         memcpy(buf_virt, buf, size);
 456
 457         ret = sdma_run_channel0(sdma);
 458
 459         spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
 460
 461         dma_free_coherent(NULL, size, buf_virt, buf_phys);
 462
 463         return ret;
 464 }
 465
 466 static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event)
 467 {
 468         struct sdma_engine *sdma = sdmac->sdma;
 469         int channel = sdmac->channel;
 470         unsigned long val;
 471         u32 chnenbl = chnenbl_ofs(sdma, event);
 472
 473         val = readl_relaxed(sdma->regs + chnenbl);
 474         __set_bit(channel, &val);
 475         writel_relaxed(val, sdma->regs + chnenbl);
 476 }
 477
 478 static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event)
 479 {
 480         struct sdma_engine *sdma = sdmac->sdma;
 481         int channel = sdmac->channel;
 482         u32 chnenbl = chnenbl_ofs(sdma, event);
 483         unsigned long val;
 484
 485         val = readl_relaxed(sdma->regs + chnenbl);
 486         __clear_bit(channel, &val);
 487         writel_relaxed(val, sdma->regs + chnenbl);
 488 }
 489
 490 static void sdma_handle_channel_loop(struct sdma_channel *sdmac)
 491 {
 492         struct sdma_buffer_descriptor *bd;
 493
 494         /*
 495          * loop mode. Iterate over descriptors, re-setup them and
 496          * call callback function.
 497          */
 498         while (1) {
 499                 bd = &sdmac->bd[sdmac->buf_tail];
 500
 501                 if (bd->mode.status & BD_DONE)
 502                         break;
 503
 504                 if (bd->mode.status & BD_RROR)
 505                         sdmac->status = DMA_ERROR;
 506                 else
 507                         sdmac->status = DMA_IN_PROGRESS;
 508
 509                 bd->mode.status |= BD_DONE;
 510                 sdmac->buf_tail++;
 511                 sdmac->buf_tail %= sdmac->num_bd;
 512
 513                 if (sdmac->desc.callback)
 514                         sdmac->desc.callback(sdmac->desc.callback_param);
 515         }
 516 }
 517
 518 static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac)
 519 {
 520         struct sdma_buffer_descriptor *bd;
 521         int i, error = 0;
 522
 523         sdmac->chn_real_count = 0;
 524         /*
 525          * non loop mode. Iterate over all descriptors, collect
 526          * errors and call callback function
 527          */
 528         for (i = 0; i < sdmac->num_bd; i++) {
 529                 bd = &sdmac->bd[i];
 530
 531                  if (bd->mode.status & (BD_DONE | BD_RROR))
 532                         error = -EIO;
 533                  sdmac->chn_real_count += bd->mode.count;
 534         }
 535
 536         if (error)
 537                 sdmac->status = DMA_ERROR;
 538         else
 539                 sdmac->status = DMA_SUCCESS;
 540
 541         dma_cookie_complete(&sdmac->desc);
 542         if (sdmac->desc.callback)
 543                 sdmac->desc.callback(sdmac->desc.callback_param);
 544 }
 545
 546 static void sdma_tasklet(unsigned long data)
 547 {
 548         struct sdma_channel *sdmac = (struct sdma_channel *) data;
 549
 550         complete(&sdmac->done);
 551
 552         if (sdmac->flags & IMX_DMA_SG_LOOP)
 553                 sdma_handle_channel_loop(sdmac);
 554         else
 555                 mxc_sdma_handle_channel_normal(sdmac);
 556 }
 557
 558 static irqreturn_t sdma_int_handler(int irq, void *dev_id)
 559 {
 560         struct sdma_engine *sdma = dev_id;
 561         unsigned long stat;
 562
 563         stat = readl_relaxed(sdma->regs + SDMA_H_INTR);
 564         /* not interested in channel 0 interrupts */
 565         stat &= ~1;
 566         writel_relaxed(stat, sdma->regs + SDMA_H_INTR);
 567
 568         while (stat) {
 569                 int channel = fls(stat) - 1;
 570                 struct sdma_channel *sdmac = &sdma->channel[channel];
 571
 572                 tasklet_schedule(&sdmac->tasklet);
 573
 574                 __clear_bit(channel, &stat);
 575         }
 576
 577         return IRQ_HANDLED;
 578 }
 579
 580 /*
 581  * sets the pc of SDMA script according to the peripheral type
 582  */
 583 static void sdma_get_pc(struct sdma_channel *sdmac,
 584                 enum sdma_peripheral_type peripheral_type)
 585 {
 586         struct sdma_engine *sdma = sdmac->sdma;
 587         int per_2_emi = 0, emi_2_per = 0;
 588         /*
 589          * These are needed once we start to support transfers between
 590          * two peripherals or memory-to-memory transfers
 591          */
 592         int per_2_per = 0, emi_2_emi = 0;
 593
 594         sdmac->pc_from_device = 0;
 595         sdmac->pc_to_device = 0;
 596
 597         switch (peripheral_type) {
 598         case IMX_DMATYPE_MEMORY:
 599                 emi_2_emi = sdma->script_addrs->ap_2_ap_addr;
 600                 break;
 601         case IMX_DMATYPE_DSP:
 602                 emi_2_per = sdma->script_addrs->bp_2_ap_addr;
 603                 per_2_emi = sdma->script_addrs->ap_2_bp_addr;
 604                 break;
 605         case IMX_DMATYPE_FIRI:
 606                 per_2_emi = sdma->script_addrs->firi_2_mcu_addr;
 607                 emi_2_per = sdma->script_addrs->mcu_2_firi_addr;
 608                 break;
 609         case IMX_DMATYPE_UART:
 610                 per_2_emi = sdma->script_addrs->uart_2_mcu_addr;
 611                 emi_2_per = sdma->script_addrs->mcu_2_app_addr;
 612                 break;
 613         case IMX_DMATYPE_UART_SP:
 614                 per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr;
 615                 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
 616                 break;
 617         case IMX_DMATYPE_ATA:
 618                 per_2_emi = sdma->script_addrs->ata_2_mcu_addr;
 619                 emi_2_per = sdma->script_addrs->mcu_2_ata_addr;
 620                 break;
 621         case IMX_DMATYPE_CSPI:
 622         case IMX_DMATYPE_EXT:
 623         case IMX_DMATYPE_SSI:
 624                 per_2_emi = sdma->script_addrs->app_2_mcu_addr;
 625                 emi_2_per = sdma->script_addrs->mcu_2_app_addr;
 626                 break;
 627         case IMX_DMATYPE_SSI_SP:
 628         case IMX_DMATYPE_MMC:
 629         case IMX_DMATYPE_SDHC:
 630         case IMX_DMATYPE_CSPI_SP:
 631         case IMX_DMATYPE_ESAI:
 632         case IMX_DMATYPE_MSHC_SP:
 633                 per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
 634                 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
 635                 break;
 636         case IMX_DMATYPE_ASRC:
 637                 per_2_emi = sdma->script_addrs->asrc_2_mcu_addr;
 638                 emi_2_per = sdma->script_addrs->asrc_2_mcu_addr;
 639                 per_2_per = sdma->script_addrs->per_2_per_addr;
 640                 break;
 641         case IMX_DMATYPE_MSHC:
 642                 per_2_emi = sdma->script_addrs->mshc_2_mcu_addr;
 643                 emi_2_per = sdma->script_addrs->mcu_2_mshc_addr;
 644                 break;
 645         case IMX_DMATYPE_CCM:
 646                 per_2_emi = sdma->script_addrs->dptc_dvfs_addr;
 647                 break;
 648         case IMX_DMATYPE_SPDIF:
 649                 per_2_emi = sdma->script_addrs->spdif_2_mcu_addr;
 650                 emi_2_per = sdma->script_addrs->mcu_2_spdif_addr;
 651                 break;
 652         case IMX_DMATYPE_IPU_MEMORY:
 653                 emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr;
 654                 break;
 655         default:
 656                 break;
 657         }
 658
 659         sdmac->pc_from_device = per_2_emi;
 660         sdmac->pc_to_device = emi_2_per;
 661 }
 662
 663 static int sdma_load_context(struct sdma_channel *sdmac)
 664 {
 665         struct sdma_engine *sdma = sdmac->sdma;
 666         int channel = sdmac->channel;
 667         int load_address;
 668         struct sdma_context_data *context = sdma->context;
 669         struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
 670         int ret;
 671         unsigned long flags;
 672
 673         if (sdmac->direction == DMA_DEV_TO_MEM) {
 674                 load_address = sdmac->pc_from_device;
 675         } else {
 676                 load_address = sdmac->pc_to_device;
 677         }
 678
 679         if (load_address < 0)
 680                 return load_address;
 681
 682         dev_dbg(sdma->dev, "load_address = %d\n", load_address);
 683         dev_dbg(sdma->dev, "wml = 0x%08x\n", (u32)sdmac->watermark_level);
 684         dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr);
 685         dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr);
 686         dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]);
 687         dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]);
 688
 689         spin_lock_irqsave(&sdma->channel_0_lock, flags);
 690
 691         memset(context, 0, sizeof(*context));
 692         context->channel_state.pc = load_address;
 693
 694         /* Send by context the event mask,base address for peripheral
 695          * and watermark level
 696          */
 697         context->gReg[0] = sdmac->event_mask[1];
 698         context->gReg[1] = sdmac->event_mask[0];
 699         context->gReg[2] = sdmac->per_addr;
 700         context->gReg[6] = sdmac->shp_addr;
 701         context->gReg[7] = sdmac->watermark_level;
 702
 703         bd0->mode.command = C0_SETDM;
 704         bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
 705         bd0->mode.count = sizeof(*context) / 4;
 706         bd0->buffer_addr = sdma->context_phys;
 707         bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel;
 708         ret = sdma_run_channel0(sdma);
 709
 710         spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
 711
 712         return ret;
 713 }
 714
 715 static void sdma_disable_channel(struct sdma_channel *sdmac)
 716 {
 717         struct sdma_engine *sdma = sdmac->sdma;
 718         int channel = sdmac->channel;
 719
 720         writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP);
 721         sdmac->status = DMA_ERROR;
 722 }
 723
 724 static int sdma_config_channel(struct sdma_channel *sdmac)
 725 {
 726         int ret;
 727
 728         sdma_disable_channel(sdmac);
 729
 730         sdmac->event_mask[0] = 0;
 731         sdmac->event_mask[1] = 0;
 732         sdmac->shp_addr = 0;
 733         sdmac->per_addr = 0;
 734
 735         if (sdmac->event_id0) {
 736                 if (sdmac->event_id0 >= sdmac->sdma->num_events)
 737                         return -EINVAL;
 738                 sdma_event_enable(sdmac, sdmac->event_id0);
 739         }
 740
 741         switch (sdmac->peripheral_type) {
 742         case IMX_DMATYPE_DSP:
 743                 sdma_config_ownership(sdmac, false, true, true);
 744                 break;
 745         case IMX_DMATYPE_MEMORY:
 746                 sdma_config_ownership(sdmac, false, true, false);
 747                 break;
 748         default:
 749                 sdma_config_ownership(sdmac, true, true, false);
 750                 break;
 751         }
 752
 753         sdma_get_pc(sdmac, sdmac->peripheral_type);
 754
 755         if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) &&
 756                         (sdmac->peripheral_type != IMX_DMATYPE_DSP)) {
 757                 /* Handle multiple event channels differently */
 758                 if (sdmac->event_id1) {
 759                         sdmac->event_mask[1] = BIT(sdmac->event_id1 % 32);
 760                         if (sdmac->event_id1 > 31)
 761                                 __set_bit(31, &sdmac->watermark_level);
 762                         sdmac->event_mask[0] = BIT(sdmac->event_id0 % 32);
 763                         if (sdmac->event_id0 > 31)
 764                                 __set_bit(30, &sdmac->watermark_level);
 765                 } else {
 766                         __set_bit(sdmac->event_id0, sdmac->event_mask);
 767                 }
 768                 /* Watermark Level */
 769                 sdmac->watermark_level |= sdmac->watermark_level;
 770                 /* Address */
 771                 sdmac->shp_addr = sdmac->per_address;
 772         } else {
 773                 sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */
 774         }
 775
 776         ret = sdma_load_context(sdmac);
 777
 778         return ret;
 779 }
 780
 781 static int sdma_set_channel_priority(struct sdma_channel *sdmac,
 782                 unsigned int priority)
 783 {
 784         struct sdma_engine *sdma = sdmac->sdma;
 785         int channel = sdmac->channel;
 786
 787         if (priority < MXC_SDMA_MIN_PRIORITY
 788             || priority > MXC_SDMA_MAX_PRIORITY) {
 789                 return -EINVAL;
 790         }
 791
 792         writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel);
 793
 794         return 0;
 795 }
 796
 797 static int sdma_request_channel(struct sdma_channel *sdmac)
 798 {
 799         struct sdma_engine *sdma = sdmac->sdma;
 800         int channel = sdmac->channel;
 801         int ret = -EBUSY;
 802
 803         sdmac->bd = dma_alloc_coherent(NULL, PAGE_SIZE, &sdmac->bd_phys, GFP_KERNEL);
 804         if (!sdmac->bd) {
 805                 ret = -ENOMEM;
 806                 goto out;
 807         }
 808
 809         memset(sdmac->bd, 0, PAGE_SIZE);
 810
 811         sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys;
 812         sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
 813
 814         sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY);
 815
 816         init_completion(&sdmac->done);
 817
 818         return 0;
 819 out:
 820
 821         return ret;
 822 }
 823
 824 static struct sdma_channel *to_sdma_chan(struct dma_chan *chan)
 825 {
 826         return container_of(chan, struct sdma_channel, chan);
 827 }
 828
 829 static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx)
 830 {
 831         unsigned long flags;
 832         struct sdma_channel *sdmac = to_sdma_chan(tx->chan);
 833         dma_cookie_t cookie;
 834
 835         spin_lock_irqsave(&sdmac->lock, flags);
 836
 837         cookie = dma_cookie_assign(tx);
 838
 839         spin_unlock_irqrestore(&sdmac->lock, flags);
 840
 841         return cookie;
 842 }
 843
 844 static int sdma_alloc_chan_resources(struct dma_chan *chan)
 845 {
 846         struct sdma_channel *sdmac = to_sdma_chan(chan);
 847         struct imx_dma_data *data = chan->private;
 848         int prio, ret;
 849
 850         if (!data)
 851                 return -EINVAL;
 852
 853         switch (data->priority) {
 854         case DMA_PRIO_HIGH:
 855                 prio = 3;
 856                 break;
 857         case DMA_PRIO_MEDIUM:
 858                 prio = 2;
 859                 break;
 860         case DMA_PRIO_LOW:
 861         default:
 862                 prio = 1;
 863                 break;
 864         }
 865
 866         sdmac->peripheral_type = data->peripheral_type;
 867         sdmac->event_id0 = data->dma_request;
 868
 869         clk_enable(sdmac->sdma->clk_ipg);
 870         clk_enable(sdmac->sdma->clk_ahb);
 871
 872         ret = sdma_request_channel(sdmac);
 873         if (ret)
 874                 return ret;
 875
 876         ret = sdma_set_channel_priority(sdmac, prio);
 877         if (ret)
 878                 return ret;
 879
 880         dma_async_tx_descriptor_init(&sdmac->desc, chan);
 881         sdmac->desc.tx_submit = sdma_tx_submit;
 882         /* txd.flags will be overwritten in prep funcs */
 883         sdmac->desc.flags = DMA_CTRL_ACK;
 884
 885         return 0;
 886 }
 887
 888 static void sdma_free_chan_resources(struct dma_chan *chan)
 889 {
 890         struct sdma_channel *sdmac = to_sdma_chan(chan);
 891         struct sdma_engine *sdma = sdmac->sdma;
 892
 893         sdma_disable_channel(sdmac);
 894
 895         if (sdmac->event_id0)
 896                 sdma_event_disable(sdmac, sdmac->event_id0);
 897         if (sdmac->event_id1)
 898                 sdma_event_disable(sdmac, sdmac->event_id1);
 899
 900         sdmac->event_id0 = 0;
 901         sdmac->event_id1 = 0;
 902
 903         sdma_set_channel_priority(sdmac, 0);
 904
 905         dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys);
 906
 907         clk_disable(sdma->clk_ipg);
 908         clk_disable(sdma->clk_ahb);
 909 }
 910
 911 static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
 912                 struct dma_chan *chan, struct scatterlist *sgl,
 913                 unsigned int sg_len, enum dma_transfer_direction direction,
 914                 unsigned long flags, void *context)
 915 {
 916         struct sdma_channel *sdmac = to_sdma_chan(chan);
 917         struct sdma_engine *sdma = sdmac->sdma;
 918         int ret, i, count;
 919         int channel = sdmac->channel;
 920         struct scatterlist *sg;
 921
 922         if (sdmac->status == DMA_IN_PROGRESS)
 923                 return NULL;
 924         sdmac->status = DMA_IN_PROGRESS;
 925
 926         sdmac->flags = 0;
 927
 928         sdmac->buf_tail = 0;
 929
 930         dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n",
 931                         sg_len, channel);
 932
 933         sdmac->direction = direction;
 934         ret = sdma_load_context(sdmac);
 935         if (ret)
 936                 goto err_out;
 937
 938         if (sg_len > NUM_BD) {
 939                 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
 940                                 channel, sg_len, NUM_BD);
 941                 ret = -EINVAL;
 942                 goto err_out;
 943         }
 944
 945         sdmac->chn_count = 0;
 946         for_each_sg(sgl, sg, sg_len, i) {
 947                 struct sdma_buffer_descriptor *bd = &sdmac->bd[i];
 948                 int param;
 949
 950                 bd->buffer_addr = sg->dma_address;
 951
 952                 count = sg_dma_len(sg);
 953
 954                 if (count > 0xffff) {
 955                         dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n",
 956                                         channel, count, 0xffff);
 957                         ret = -EINVAL;
 958                         goto err_out;
 959                 }
 960
 961                 bd->mode.count = count;
 962                 sdmac->chn_count += count;
 963
 964                 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) {
 965                         ret =  -EINVAL;
 966                         goto err_out;
 967                 }
 968
 969                 switch (sdmac->word_size) {
 970                 case DMA_SLAVE_BUSWIDTH_4_BYTES:
 971                         bd->mode.command = 0;
 972                         if (count & 3 || sg->dma_address & 3)
 973                                 return NULL;
 974                         break;
 975                 case DMA_SLAVE_BUSWIDTH_2_BYTES:
 976                         bd->mode.command = 2;
 977                         if (count & 1 || sg->dma_address & 1)
 978                                 return NULL;
 979                         break;
 980                 case DMA_SLAVE_BUSWIDTH_1_BYTE:
 981                         bd->mode.command = 1;
 982                         break;
 983                 default:
 984                         return NULL;
 985                 }
 986
 987                 param = BD_DONE | BD_EXTD | BD_CONT;
 988
 989                 if (i + 1 == sg_len) {
 990                         param |= BD_INTR;
 991                         param |= BD_LAST;
 992                         param &= ~BD_CONT;
 993                 }
 994
 995                 dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n",
 996                                 i, count, sg->dma_address,
 997                                 param & BD_WRAP ? "wrap" : "",
 998                                 param & BD_INTR ? " intr" : "");
 999
1000                 bd->mode.status = param;
1001         }
1002
1003         sdmac->num_bd = sg_len;
1004         sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
1005
1006         return &sdmac->desc;
1007 err_out:
1008         sdmac->status = DMA_ERROR;
1009         return NULL;
1010 }
1011
1012 static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
1013                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
1014                 size_t period_len, enum dma_transfer_direction direction,
1015                 void *context)
1016 {
1017         struct sdma_channel *sdmac = to_sdma_chan(chan);
1018         struct sdma_engine *sdma = sdmac->sdma;
1019         int num_periods = buf_len / period_len;
1020         int channel = sdmac->channel;
1021         int ret, i = 0, buf = 0;
1022
1023         dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel);
1024
1025         if (sdmac->status == DMA_IN_PROGRESS)
1026                 return NULL;
1027
1028         sdmac->status = DMA_IN_PROGRESS;
1029
1030         sdmac->buf_tail = 0;
1031
1032         sdmac->flags |= IMX_DMA_SG_LOOP;
1033         sdmac->direction = direction;
1034         ret = sdma_load_context(sdmac);
1035         if (ret)
1036                 goto err_out;
1037
1038         if (num_periods > NUM_BD) {
1039                 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
1040                                 channel, num_periods, NUM_BD);
1041                 goto err_out;
1042         }
1043
1044         if (period_len > 0xffff) {
1045                 dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %d > %d\n",
1046                                 channel, period_len, 0xffff);
1047                 goto err_out;
1048         }
1049
1050         while (buf < buf_len) {
1051                 struct sdma_buffer_descriptor *bd = &sdmac->bd[i];
1052                 int param;
1053
1054                 bd->buffer_addr = dma_addr;
1055
1056                 bd->mode.count = period_len;
1057
1058                 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES)
1059                         goto err_out;
1060                 if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES)
1061                         bd->mode.command = 0;
1062                 else
1063                         bd->mode.command = sdmac->word_size;
1064
1065                 param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR;
1066                 if (i + 1 == num_periods)
1067                         param |= BD_WRAP;
1068
1069                 dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n",
1070                                 i, period_len, dma_addr,
1071                                 param & BD_WRAP ? "wrap" : "",
1072                                 param & BD_INTR ? " intr" : "");
1073
1074                 bd->mode.status = param;
1075
1076                 dma_addr += period_len;
1077                 buf += period_len;
1078
1079                 i++;
1080         }
1081
1082         sdmac->num_bd = num_periods;
1083         sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
1084
1085         return &sdmac->desc;
1086 err_out:
1087         sdmac->status = DMA_ERROR;
1088         return NULL;
1089 }
1090
1091 static int sdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1092                 unsigned long arg)
1093 {
1094         struct sdma_channel *sdmac = to_sdma_chan(chan);
1095         struct dma_slave_config *dmaengine_cfg = (void *)arg;
1096
1097         switch (cmd) {
1098         case DMA_TERMINATE_ALL:
1099                 sdma_disable_channel(sdmac);
1100                 return 0;
1101         case DMA_SLAVE_CONFIG:
1102                 if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
1103                         sdmac->per_address = dmaengine_cfg->src_addr;
1104                         sdmac->watermark_level = dmaengine_cfg->src_maxburst *
1105                                                 dmaengine_cfg->src_addr_width;
1106                         sdmac->word_size = dmaengine_cfg->src_addr_width;
1107                 } else {
1108                         sdmac->per_address = dmaengine_cfg->dst_addr;
1109                         sdmac->watermark_level = dmaengine_cfg->dst_maxburst *
1110                                                 dmaengine_cfg->dst_addr_width;
1111                         sdmac->word_size = dmaengine_cfg->dst_addr_width;
1112                 }
1113                 sdmac->direction = dmaengine_cfg->direction;
1114                 return sdma_config_channel(sdmac);
1115         default:
1116                 return -ENOSYS;
1117         }
1118
1119         return -EINVAL;
1120 }
1121
1122 static enum dma_status sdma_tx_status(struct dma_chan *chan,
1123                                             dma_cookie_t cookie,
1124                                             struct dma_tx_state *txstate)
1125 {
1126         struct sdma_channel *sdmac = to_sdma_chan(chan);
1127         dma_cookie_t last_used;
1128
1129         last_used = chan->cookie;
1130
1131         dma_set_tx_state(txstate, chan->completed_cookie, last_used,
1132                         sdmac->chn_count - sdmac->chn_real_count);
1133
1134         return sdmac->status;
1135 }
1136
1137 static void sdma_issue_pending(struct dma_chan *chan)
1138 {
1139         struct sdma_channel *sdmac = to_sdma_chan(chan);
1140         struct sdma_engine *sdma = sdmac->sdma;
1141
1142         if (sdmac->status == DMA_IN_PROGRESS)
1143                 sdma_enable_channel(sdma, sdmac->channel);
1144 }
1145
1146 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34
1147
1148 static void sdma_add_scripts(struct sdma_engine *sdma,
1149                 const struct sdma_script_start_addrs *addr)
1150 {
1151         s32 *addr_arr = (u32 *)addr;
1152         s32 *saddr_arr = (u32 *)sdma->script_addrs;
1153         int i;
1154
1155         for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++)
1156                 if (addr_arr[i] > 0)
1157                         saddr_arr[i] = addr_arr[i];
1158 }
1159
1160 static void sdma_load_firmware(const struct firmware *fw, void *context)
1161 {
1162         struct sdma_engine *sdma = context;
1163         const struct sdma_firmware_header *header;
1164         const struct sdma_script_start_addrs *addr;
1165         unsigned short *ram_code;
1166
1167         if (!fw) {
1168                 dev_err(sdma->dev, "firmware not found\n");
1169                 return;
1170         }
1171
1172         if (fw->size < sizeof(*header))
1173                 goto err_firmware;
1174
1175         header = (struct sdma_firmware_header *)fw->data;
1176
1177         if (header->magic != SDMA_FIRMWARE_MAGIC)
1178                 goto err_firmware;
1179         if (header->ram_code_start + header->ram_code_size > fw->size)
1180                 goto err_firmware;
1181
1182         addr = (void *)header + header->script_addrs_start;
1183         ram_code = (void *)header + header->ram_code_start;
1184
1185         clk_enable(sdma->clk_ipg);
1186         clk_enable(sdma->clk_ahb);
1187         /* download the RAM image for SDMA */
1188         sdma_load_script(sdma, ram_code,
1189                         header->ram_code_size,
1190                         addr->ram_code_start_addr);
1191         clk_disable(sdma->clk_ipg);
1192         clk_disable(sdma->clk_ahb);
1193
1194         sdma_add_scripts(sdma, addr);
1195
1196         dev_info(sdma->dev, "loaded firmware %d.%d\n",
1197                         header->version_major,
1198                         header->version_minor);
1199
1200 err_firmware:
1201         release_firmware(fw);
1202 }
1203
1204 static int __init sdma_get_firmware(struct sdma_engine *sdma,
1205                 const char *fw_name)
1206 {
1207         int ret;
1208
1209         ret = request_firmware_nowait(THIS_MODULE,
1210                         FW_ACTION_HOTPLUG, fw_name, sdma->dev,
1211                         GFP_KERNEL, sdma, sdma_load_firmware);
1212
1213         return ret;
1214 }
1215
1216 static int __init sdma_init(struct sdma_engine *sdma)
1217 {
1218         int i, ret;
1219         dma_addr_t ccb_phys;
1220
1221         switch (sdma->devtype) {
1222         case IMX31_SDMA:
1223                 sdma->num_events = 32;
1224                 break;
1225         case IMX35_SDMA:
1226                 sdma->num_events = 48;
1227                 break;
1228         default:
1229                 dev_err(sdma->dev, "Unknown sdma type %d. aborting\n",
1230                         sdma->devtype);
1231                 return -ENODEV;
1232         }
1233
1234         clk_enable(sdma->clk_ipg);
1235         clk_enable(sdma->clk_ahb);
1236
1237         /* Be sure SDMA has not started yet */
1238         writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
1239
1240         sdma->channel_control = dma_alloc_coherent(NULL,
1241                         MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) +
1242                         sizeof(struct sdma_context_data),
1243                         &ccb_phys, GFP_KERNEL);
1244
1245         if (!sdma->channel_control) {
1246                 ret = -ENOMEM;
1247                 goto err_dma_alloc;
1248         }
1249
1250         sdma->context = (void *)sdma->channel_control +
1251                 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control);
1252         sdma->context_phys = ccb_phys +
1253                 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control);
1254
1255         /* Zero-out the CCB structures array just allocated */
1256         memset(sdma->channel_control, 0,
1257                         MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control));
1258
1259         /* disable all channels */
1260         for (i = 0; i < sdma->num_events; i++)
1261                 writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i));
1262
1263         /* All channels have priority 0 */
1264         for (i = 0; i < MAX_DMA_CHANNELS; i++)
1265                 writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4);
1266
1267         ret = sdma_request_channel(&sdma->channel[0]);
1268         if (ret)
1269                 goto err_dma_alloc;
1270
1271         sdma_config_ownership(&sdma->channel[0], false, true, false);
1272
1273         /* Set Command Channel (Channel Zero) */
1274         writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR);
1275
1276         /* Set bits of CONFIG register but with static context switching */
1277         /* FIXME: Check whether to set ACR bit depending on clock ratios */
1278         writel_relaxed(0, sdma->regs + SDMA_H_CONFIG);
1279
1280         writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR);
1281
1282         /* Set bits of CONFIG register with given context switching mode */
1283         writel_relaxed(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG);
1284
1285         /* Initializes channel's priorities */
1286         sdma_set_channel_priority(&sdma->channel[0], 7);
1287
1288         clk_disable(sdma->clk_ipg);
1289         clk_disable(sdma->clk_ahb);
1290
1291         return 0;
1292
1293 err_dma_alloc:
1294         clk_disable(sdma->clk_ipg);
1295         clk_disable(sdma->clk_ahb);
1296         dev_err(sdma->dev, "initialisation failed with %d\n", ret);
1297         return ret;
1298 }
1299
1300 static int __init sdma_probe(struct platform_device *pdev)
1301 {
1302         const struct of_device_id *of_id =
1303                         of_match_device(sdma_dt_ids, &pdev->dev);
1304         struct device_node *np = pdev->dev.of_node;
1305         const char *fw_name;
1306         int ret;
1307         int irq;
1308         struct resource *iores;
1309         struct sdma_platform_data *pdata = pdev->dev.platform_data;
1310         int i;
1311         struct sdma_engine *sdma;
1312         s32 *saddr_arr;
1313
1314         sdma = kzalloc(sizeof(*sdma), GFP_KERNEL);
1315         if (!sdma)
1316                 return -ENOMEM;
1317
1318         spin_lock_init(&sdma->channel_0_lock);
1319
1320         sdma->dev = &pdev->dev;
1321
1322         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1323         irq = platform_get_irq(pdev, 0);
1324         if (!iores || irq < 0) {
1325                 ret = -EINVAL;
1326                 goto err_irq;
1327         }
1328
1329         if (!request_mem_region(iores->start, resource_size(iores), pdev->name)) {
1330                 ret = -EBUSY;
1331                 goto err_request_region;
1332         }
1333
1334         sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1335         if (IS_ERR(sdma->clk_ipg)) {
1336                 ret = PTR_ERR(sdma->clk_ipg);
1337                 goto err_clk;
1338         }
1339
1340         sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
1341         if (IS_ERR(sdma->clk_ahb)) {
1342                 ret = PTR_ERR(sdma->clk_ahb);
1343                 goto err_clk;
1344         }
1345
1346         clk_prepare(sdma->clk_ipg);
1347         clk_prepare(sdma->clk_ahb);
1348
1349         sdma->regs = ioremap(iores->start, resource_size(iores));
1350         if (!sdma->regs) {
1351                 ret = -ENOMEM;
1352                 goto err_ioremap;
1353         }
1354
1355         ret = request_irq(irq, sdma_int_handler, 0, "sdma", sdma);
1356         if (ret)
1357                 goto err_request_irq;
1358
1359         sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL);
1360         if (!sdma->script_addrs) {
1361                 ret = -ENOMEM;
1362                 goto err_alloc;
1363         }
1364
1365         /* initially no scripts available */
1366         saddr_arr = (s32 *)sdma->script_addrs;
1367         for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++)
1368                 saddr_arr[i] = -EINVAL;
1369
1370         if (of_id)
1371                 pdev->id_entry = of_id->data;
1372         sdma->devtype = pdev->id_entry->driver_data;
1373
1374         dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
1375         dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);
1376
1377         INIT_LIST_HEAD(&sdma->dma_device.channels);
1378         /* Initialize channel parameters */
1379         for (i = 0; i < MAX_DMA_CHANNELS; i++) {
1380                 struct sdma_channel *sdmac = &sdma->channel[i];
1381
1382                 sdmac->sdma = sdma;
1383                 spin_lock_init(&sdmac->lock);
1384
1385                 sdmac->chan.device = &sdma->dma_device;
1386                 dma_cookie_init(&sdmac->chan);
1387                 sdmac->channel = i;
1388
1389                 tasklet_init(&sdmac->tasklet, sdma_tasklet,
1390                              (unsigned long) sdmac);
1391                 /*
1392                  * Add the channel to the DMAC list. Do not add channel 0 though
1393                  * because we need it internally in the SDMA driver. This also means
1394                  * that channel 0 in dmaengine counting matches sdma channel 1.
1395                  */
1396                 if (i)
1397                         list_add_tail(&sdmac->chan.device_node,
1398                                         &sdma->dma_device.channels);
1399         }
1400
1401         ret = sdma_init(sdma);
1402         if (ret)
1403                 goto err_init;
1404
1405         if (pdata && pdata->script_addrs)
1406                 sdma_add_scripts(sdma, pdata->script_addrs);
1407
1408         if (pdata) {
1409                 ret = sdma_get_firmware(sdma, pdata->fw_name);
1410                 if (ret)
1411                         dev_warn(&pdev->dev, "failed to get firmware from platform data\n");
1412         } else {
1413                 /*
1414                  * Because that device tree does not encode ROM script address,
1415                  * the RAM script in firmware is mandatory for device tree
1416                  * probe, otherwise it fails.
1417                  */
1418                 ret = of_property_read_string(np, "fsl,sdma-ram-script-name",
1419                                               &fw_name);
1420                 if (ret)
1421                         dev_warn(&pdev->dev, "failed to get firmware name\n");
1422                 else {
1423                         ret = sdma_get_firmware(sdma, fw_name);
1424                         if (ret)
1425                                 dev_warn(&pdev->dev, "failed to get firmware from device tree\n");
1426                 }
1427         }
1428
1429         sdma->dma_device.dev = &pdev->dev;
1430
1431         sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources;
1432         sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources;
1433         sdma->dma_device.device_tx_status = sdma_tx_status;
1434         sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg;
1435         sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic;
1436         sdma->dma_device.device_control = sdma_control;
1437         sdma->dma_device.device_issue_pending = sdma_issue_pending;
1438         sdma->dma_device.dev->dma_parms = &sdma->dma_parms;
1439         dma_set_max_seg_size(sdma->dma_device.dev, 65535);
1440
1441         ret = dma_async_device_register(&sdma->dma_device);
1442         if (ret) {
1443                 dev_err(&pdev->dev, "unable to register\n");
1444                 goto err_init;
1445         }
1446
1447         dev_info(sdma->dev, "initialized\n");
1448
1449         return 0;
1450
1451 err_init:
1452         kfree(sdma->script_addrs);
1453 err_alloc:
1454         free_irq(irq, sdma);
1455 err_request_irq:
1456         iounmap(sdma->regs);
1457 err_ioremap:
1458 err_clk:
1459         release_mem_region(iores->start, resource_size(iores));
1460 err_request_region:
1461 err_irq:
1462         kfree(sdma);
1463         return ret;
1464 }
1465
1466 static int __exit sdma_remove(struct platform_device *pdev)
1467 {
1468         return -EBUSY;
1469 }
1470
1471 static struct platform_driver sdma_driver = {
1472         .driver         = {
1473                 .name   = "imx-sdma",
1474                 .of_match_table = sdma_dt_ids,
1475         },
1476         .id_table       = sdma_devtypes,
1477         .remove         = __exit_p(sdma_remove),
1478 };
1479
1480 static int __init sdma_module_init(void)
1481 {
1482         return platform_driver_probe(&sdma_driver, sdma_probe);
1483 }
1484 module_init(sdma_module_init);
1485
1486 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1487 MODULE_DESCRIPTION("i.MX SDMA driver");
1488 MODULE_LICENSE("GPL");