drivers/dma/ipu/ipu_idmac.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2008
   4  * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
   5  *
   6  * Copyright (C) 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
   7  */
   8
   9 #include <linux/dma-mapping.h>
  10 #include <linux/init.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/err.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/delay.h>
  15 #include <linux/list.h>
  16 #include <linux/clk.h>
  17 #include <linux/vmalloc.h>
  18 #include <linux/string.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/io.h>
  21 #include <linux/module.h>
  22 #include <linux/dma/ipu-dma.h>
  23
  24 #include "../dmaengine.h"
  25 #include "ipu_intern.h"
  26
  27 #define FS_VF_IN_VALID  0x00000002
  28 #define FS_ENC_IN_VALID 0x00000001
  29
  30 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
  31                                bool wait_for_stop);
  32
  33 /*
  34  * There can be only one, we could allocate it dynamically, but then we'd have
  35  * to add an extra parameter to some functions, and use something as ugly as
  36  *      struct ipu *ipu = to_ipu(to_idmac(ichan->dma_chan.device));
  37  * in the ISR
  38  */
  39 static struct ipu ipu_data;
  40
  41 #define to_ipu(id) container_of(id, struct ipu, idmac)
  42
  43 static u32 __idmac_read_icreg(struct ipu *ipu, unsigned long reg)
  44 {
  45         return __raw_readl(ipu->reg_ic + reg);
  46 }
  47
  48 #define idmac_read_icreg(ipu, reg) __idmac_read_icreg(ipu, reg - IC_CONF)
  49
  50 static void __idmac_write_icreg(struct ipu *ipu, u32 value, unsigned long reg)
  51 {
  52         __raw_writel(value, ipu->reg_ic + reg);
  53 }
  54
  55 #define idmac_write_icreg(ipu, v, reg) __idmac_write_icreg(ipu, v, reg - IC_CONF)
  56
  57 static u32 idmac_read_ipureg(struct ipu *ipu, unsigned long reg)
  58 {
  59         return __raw_readl(ipu->reg_ipu + reg);
  60 }
  61
  62 static void idmac_write_ipureg(struct ipu *ipu, u32 value, unsigned long reg)
  63 {
  64         __raw_writel(value, ipu->reg_ipu + reg);
  65 }
  66
  67 /*****************************************************************************
  68  * IPU / IC common functions
  69  */
  70 static void dump_idmac_reg(struct ipu *ipu)
  71 {
  72         dev_dbg(ipu->dev, "IDMAC_CONF 0x%x, IC_CONF 0x%x, IDMAC_CHA_EN 0x%x, "
  73                 "IDMAC_CHA_PRI 0x%x, IDMAC_CHA_BUSY 0x%x\n",
  74                 idmac_read_icreg(ipu, IDMAC_CONF),
  75                 idmac_read_icreg(ipu, IC_CONF),
  76                 idmac_read_icreg(ipu, IDMAC_CHA_EN),
  77                 idmac_read_icreg(ipu, IDMAC_CHA_PRI),
  78                 idmac_read_icreg(ipu, IDMAC_CHA_BUSY));
  79         dev_dbg(ipu->dev, "BUF0_RDY 0x%x, BUF1_RDY 0x%x, CUR_BUF 0x%x, "
  80                 "DB_MODE 0x%x, TASKS_STAT 0x%x\n",
  81                 idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
  82                 idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
  83                 idmac_read_ipureg(ipu, IPU_CHA_CUR_BUF),
  84                 idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL),
  85                 idmac_read_ipureg(ipu, IPU_TASKS_STAT));
  86 }
  87
  88 static uint32_t bytes_per_pixel(enum pixel_fmt fmt)
  89 {
  90         switch (fmt) {
  91         case IPU_PIX_FMT_GENERIC:       /* generic data */
  92         case IPU_PIX_FMT_RGB332:
  93         case IPU_PIX_FMT_YUV420P:
  94         case IPU_PIX_FMT_YUV422P:
  95         default:
  96                 return 1;
  97         case IPU_PIX_FMT_RGB565:
  98         case IPU_PIX_FMT_YUYV:
  99         case IPU_PIX_FMT_UYVY:
 100                 return 2;
 101         case IPU_PIX_FMT_BGR24:
 102         case IPU_PIX_FMT_RGB24:
 103                 return 3;
 104         case IPU_PIX_FMT_GENERIC_32:    /* generic data */
 105         case IPU_PIX_FMT_BGR32:
 106         case IPU_PIX_FMT_RGB32:
 107         case IPU_PIX_FMT_ABGR32:
 108                 return 4;
 109         }
 110 }
 111
 112 /* Enable direct write to memory by the Camera Sensor Interface */
 113 static void ipu_ic_enable_task(struct ipu *ipu, enum ipu_channel channel)
 114 {
 115         uint32_t ic_conf, mask;
 116
 117         switch (channel) {
 118         case IDMAC_IC_0:
 119                 mask = IC_CONF_PRPENC_EN;
 120                 break;
 121         case IDMAC_IC_7:
 122                 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
 123                 break;
 124         default:
 125                 return;
 126         }
 127         ic_conf = idmac_read_icreg(ipu, IC_CONF) | mask;
 128         idmac_write_icreg(ipu, ic_conf, IC_CONF);
 129 }
 130
 131 /* Called under spin_lock_irqsave(&ipu_data.lock) */
 132 static void ipu_ic_disable_task(struct ipu *ipu, enum ipu_channel channel)
 133 {
 134         uint32_t ic_conf, mask;
 135
 136         switch (channel) {
 137         case IDMAC_IC_0:
 138                 mask = IC_CONF_PRPENC_EN;
 139                 break;
 140         case IDMAC_IC_7:
 141                 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
 142                 break;
 143         default:
 144                 return;
 145         }
 146         ic_conf = idmac_read_icreg(ipu, IC_CONF) & ~mask;
 147         idmac_write_icreg(ipu, ic_conf, IC_CONF);
 148 }
 149
 150 static uint32_t ipu_channel_status(struct ipu *ipu, enum ipu_channel channel)
 151 {
 152         uint32_t stat = TASK_STAT_IDLE;
 153         uint32_t task_stat_reg = idmac_read_ipureg(ipu, IPU_TASKS_STAT);
 154
 155         switch (channel) {
 156         case IDMAC_IC_7:
 157                 stat = (task_stat_reg & TSTAT_CSI2MEM_MASK) >>
 158                         TSTAT_CSI2MEM_OFFSET;
 159                 break;
 160         case IDMAC_IC_0:
 161         case IDMAC_SDC_0:
 162         case IDMAC_SDC_1:
 163         default:
 164                 break;
 165         }
 166         return stat;
 167 }
 168
 169 struct chan_param_mem_planar {
 170         /* Word 0 */
 171         u32     xv:10;
 172         u32     yv:10;
 173         u32     xb:12;
 174
 175         u32     yb:12;
 176         u32     res1:2;
 177         u32     nsb:1;
 178         u32     lnpb:6;
 179         u32     ubo_l:11;
 180
 181         u32     ubo_h:15;
 182         u32     vbo_l:17;
 183
 184         u32     vbo_h:9;
 185         u32     res2:3;
 186         u32     fw:12;
 187         u32     fh_l:8;
 188
 189         u32     fh_h:4;
 190         u32     res3:28;
 191
 192         /* Word 1 */
 193         u32     eba0;
 194
 195         u32     eba1;
 196
 197         u32     bpp:3;
 198         u32     sl:14;
 199         u32     pfs:3;
 200         u32     bam:3;
 201         u32     res4:2;
 202         u32     npb:6;
 203         u32     res5:1;
 204
 205         u32     sat:2;
 206         u32     res6:30;
 207 } __attribute__ ((packed));
 208
 209 struct chan_param_mem_interleaved {
 210         /* Word 0 */
 211         u32     xv:10;
 212         u32     yv:10;
 213         u32     xb:12;
 214
 215         u32     yb:12;
 216         u32     sce:1;
 217         u32     res1:1;
 218         u32     nsb:1;
 219         u32     lnpb:6;
 220         u32     sx:10;
 221         u32     sy_l:1;
 222
 223         u32     sy_h:9;
 224         u32     ns:10;
 225         u32     sm:10;
 226         u32     sdx_l:3;
 227
 228         u32     sdx_h:2;
 229         u32     sdy:5;
 230         u32     sdrx:1;
 231         u32     sdry:1;
 232         u32     sdr1:1;
 233         u32     res2:2;
 234         u32     fw:12;
 235         u32     fh_l:8;
 236
 237         u32     fh_h:4;
 238         u32     res3:28;
 239
 240         /* Word 1 */
 241         u32     eba0;
 242
 243         u32     eba1;
 244
 245         u32     bpp:3;
 246         u32     sl:14;
 247         u32     pfs:3;
 248         u32     bam:3;
 249         u32     res4:2;
 250         u32     npb:6;
 251         u32     res5:1;
 252
 253         u32     sat:2;
 254         u32     scc:1;
 255         u32     ofs0:5;
 256         u32     ofs1:5;
 257         u32     ofs2:5;
 258         u32     ofs3:5;
 259         u32     wid0:3;
 260         u32     wid1:3;
 261         u32     wid2:3;
 262
 263         u32     wid3:3;
 264         u32     dec_sel:1;
 265         u32     res6:28;
 266 } __attribute__ ((packed));
 267
 268 union chan_param_mem {
 269         struct chan_param_mem_planar            pp;
 270         struct chan_param_mem_interleaved       ip;
 271 };
 272
 273 static void ipu_ch_param_set_plane_offset(union chan_param_mem *params,
 274                                           u32 u_offset, u32 v_offset)
 275 {
 276         params->pp.ubo_l = u_offset & 0x7ff;
 277         params->pp.ubo_h = u_offset >> 11;
 278         params->pp.vbo_l = v_offset & 0x1ffff;
 279         params->pp.vbo_h = v_offset >> 17;
 280 }
 281
 282 static void ipu_ch_param_set_size(union chan_param_mem *params,
 283                                   uint32_t pixel_fmt, uint16_t width,
 284                                   uint16_t height, uint16_t stride)
 285 {
 286         u32 u_offset;
 287         u32 v_offset;
 288
 289         params->pp.fw           = width - 1;
 290         params->pp.fh_l         = height - 1;
 291         params->pp.fh_h         = (height - 1) >> 8;
 292         params->pp.sl           = stride - 1;
 293
 294         switch (pixel_fmt) {
 295         case IPU_PIX_FMT_GENERIC:
 296                 /*Represents 8-bit Generic data */
 297                 params->pp.bpp  = 3;
 298                 params->pp.pfs  = 7;
 299                 params->pp.npb  = 31;
 300                 params->pp.sat  = 2;            /* SAT = use 32-bit access */
 301                 break;
 302         case IPU_PIX_FMT_GENERIC_32:
 303                 /*Represents 32-bit Generic data */
 304                 params->pp.bpp  = 0;
 305                 params->pp.pfs  = 7;
 306                 params->pp.npb  = 7;
 307                 params->pp.sat  = 2;            /* SAT = use 32-bit access */
 308                 break;
 309         case IPU_PIX_FMT_RGB565:
 310                 params->ip.bpp  = 2;
 311                 params->ip.pfs  = 4;
 312                 params->ip.npb  = 15;
 313                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 314                 params->ip.ofs0 = 0;            /* Red bit offset */
 315                 params->ip.ofs1 = 5;            /* Green bit offset */
 316                 params->ip.ofs2 = 11;           /* Blue bit offset */
 317                 params->ip.ofs3 = 16;           /* Alpha bit offset */
 318                 params->ip.wid0 = 4;            /* Red bit width - 1 */
 319                 params->ip.wid1 = 5;            /* Green bit width - 1 */
 320                 params->ip.wid2 = 4;            /* Blue bit width - 1 */
 321                 break;
 322         case IPU_PIX_FMT_BGR24:
 323                 params->ip.bpp  = 1;            /* 24 BPP & RGB PFS */
 324                 params->ip.pfs  = 4;
 325                 params->ip.npb  = 7;
 326                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 327                 params->ip.ofs0 = 0;            /* Red bit offset */
 328                 params->ip.ofs1 = 8;            /* Green bit offset */
 329                 params->ip.ofs2 = 16;           /* Blue bit offset */
 330                 params->ip.ofs3 = 24;           /* Alpha bit offset */
 331                 params->ip.wid0 = 7;            /* Red bit width - 1 */
 332                 params->ip.wid1 = 7;            /* Green bit width - 1 */
 333                 params->ip.wid2 = 7;            /* Blue bit width - 1 */
 334                 break;
 335         case IPU_PIX_FMT_RGB24:
 336                 params->ip.bpp  = 1;            /* 24 BPP & RGB PFS */
 337                 params->ip.pfs  = 4;
 338                 params->ip.npb  = 7;
 339                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 340                 params->ip.ofs0 = 16;           /* Red bit offset */
 341                 params->ip.ofs1 = 8;            /* Green bit offset */
 342                 params->ip.ofs2 = 0;            /* Blue bit offset */
 343                 params->ip.ofs3 = 24;           /* Alpha bit offset */
 344                 params->ip.wid0 = 7;            /* Red bit width - 1 */
 345                 params->ip.wid1 = 7;            /* Green bit width - 1 */
 346                 params->ip.wid2 = 7;            /* Blue bit width - 1 */
 347                 break;
 348         case IPU_PIX_FMT_BGRA32:
 349         case IPU_PIX_FMT_BGR32:
 350         case IPU_PIX_FMT_ABGR32:
 351                 params->ip.bpp  = 0;
 352                 params->ip.pfs  = 4;
 353                 params->ip.npb  = 7;
 354                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 355                 params->ip.ofs0 = 8;            /* Red bit offset */
 356                 params->ip.ofs1 = 16;           /* Green bit offset */
 357                 params->ip.ofs2 = 24;           /* Blue bit offset */
 358                 params->ip.ofs3 = 0;            /* Alpha bit offset */
 359                 params->ip.wid0 = 7;            /* Red bit width - 1 */
 360                 params->ip.wid1 = 7;            /* Green bit width - 1 */
 361                 params->ip.wid2 = 7;            /* Blue bit width - 1 */
 362                 params->ip.wid3 = 7;            /* Alpha bit width - 1 */
 363                 break;
 364         case IPU_PIX_FMT_RGBA32:
 365         case IPU_PIX_FMT_RGB32:
 366                 params->ip.bpp  = 0;
 367                 params->ip.pfs  = 4;
 368                 params->ip.npb  = 7;
 369                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 370                 params->ip.ofs0 = 24;           /* Red bit offset */
 371                 params->ip.ofs1 = 16;           /* Green bit offset */
 372                 params->ip.ofs2 = 8;            /* Blue bit offset */
 373                 params->ip.ofs3 = 0;            /* Alpha bit offset */
 374                 params->ip.wid0 = 7;            /* Red bit width - 1 */
 375                 params->ip.wid1 = 7;            /* Green bit width - 1 */
 376                 params->ip.wid2 = 7;            /* Blue bit width - 1 */
 377                 params->ip.wid3 = 7;            /* Alpha bit width - 1 */
 378                 break;
 379         case IPU_PIX_FMT_UYVY:
 380                 params->ip.bpp  = 2;
 381                 params->ip.pfs  = 6;
 382                 params->ip.npb  = 7;
 383                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 384                 break;
 385         case IPU_PIX_FMT_YUV420P2:
 386         case IPU_PIX_FMT_YUV420P:
 387                 params->ip.bpp  = 3;
 388                 params->ip.pfs  = 3;
 389                 params->ip.npb  = 7;
 390                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 391                 u_offset = stride * height;
 392                 v_offset = u_offset + u_offset / 4;
 393                 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
 394                 break;
 395         case IPU_PIX_FMT_YVU422P:
 396                 params->ip.bpp  = 3;
 397                 params->ip.pfs  = 2;
 398                 params->ip.npb  = 7;
 399                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 400                 v_offset = stride * height;
 401                 u_offset = v_offset + v_offset / 2;
 402                 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
 403                 break;
 404         case IPU_PIX_FMT_YUV422P:
 405                 params->ip.bpp  = 3;
 406                 params->ip.pfs  = 2;
 407                 params->ip.npb  = 7;
 408                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 409                 u_offset = stride * height;
 410                 v_offset = u_offset + u_offset / 2;
 411                 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
 412                 break;
 413         default:
 414                 dev_err(ipu_data.dev,
 415                         "mx3 ipu: unimplemented pixel format %d\n", pixel_fmt);
 416                 break;
 417         }
 418
 419         params->pp.nsb = 1;
 420 }
 421
 422 static void ipu_ch_param_set_buffer(union chan_param_mem *params,
 423                                     dma_addr_t buf0, dma_addr_t buf1)
 424 {
 425         params->pp.eba0 = buf0;
 426         params->pp.eba1 = buf1;
 427 }
 428
 429 static void ipu_ch_param_set_rotation(union chan_param_mem *params,
 430                                       enum ipu_rotate_mode rotate)
 431 {
 432         params->pp.bam = rotate;
 433 }
 434
 435 static void ipu_write_param_mem(uint32_t addr, uint32_t *data,
 436                                 uint32_t num_words)
 437 {
 438         for (; num_words > 0; num_words--) {
 439                 dev_dbg(ipu_data.dev,
 440                         "write param mem - addr = 0x%08X, data = 0x%08X\n",
 441                         addr, *data);
 442                 idmac_write_ipureg(&ipu_data, addr, IPU_IMA_ADDR);
 443                 idmac_write_ipureg(&ipu_data, *data++, IPU_IMA_DATA);
 444                 addr++;
 445                 if ((addr & 0x7) == 5) {
 446                         addr &= ~0x7;   /* set to word 0 */
 447                         addr += 8;      /* increment to next row */
 448                 }
 449         }
 450 }
 451
 452 static int calc_resize_coeffs(uint32_t in_size, uint32_t out_size,
 453                               uint32_t *resize_coeff,
 454                               uint32_t *downsize_coeff)
 455 {
 456         uint32_t temp_size;
 457         uint32_t temp_downsize;
 458
 459         *resize_coeff   = 1 << 13;
 460         *downsize_coeff = 1 << 13;
 461
 462         /* Cannot downsize more than 8:1 */
 463         if (out_size << 3 < in_size)
 464                 return -EINVAL;
 465
 466         /* compute downsizing coefficient */
 467         temp_downsize = 0;
 468         temp_size = in_size;
 469         while (temp_size >= out_size * 2 && temp_downsize < 2) {
 470                 temp_size >>= 1;
 471                 temp_downsize++;
 472         }
 473         *downsize_coeff = temp_downsize;
 474
 475         /*
 476          * compute resizing coefficient using the following formula:
 477          * resize_coeff = M*(SI -1)/(SO - 1)
 478          * where M = 2^13, SI - input size, SO - output size
 479          */
 480         *resize_coeff = (8192L * (temp_size - 1)) / (out_size - 1);
 481         if (*resize_coeff >= 16384L) {
 482                 dev_err(ipu_data.dev, "Warning! Overflow on resize coeff.\n");
 483                 *resize_coeff = 0x3FFF;
 484         }
 485
 486         dev_dbg(ipu_data.dev, "resizing from %u -> %u pixels, "
 487                 "downsize=%u, resize=%u.%lu (reg=%u)\n", in_size, out_size,
 488                 *downsize_coeff, *resize_coeff >= 8192L ? 1 : 0,
 489                 ((*resize_coeff & 0x1FFF) * 10000L) / 8192L, *resize_coeff);
 490
 491         return 0;
 492 }
 493
 494 static enum ipu_color_space format_to_colorspace(enum pixel_fmt fmt)
 495 {
 496         switch (fmt) {
 497         case IPU_PIX_FMT_RGB565:
 498         case IPU_PIX_FMT_BGR24:
 499         case IPU_PIX_FMT_RGB24:
 500         case IPU_PIX_FMT_BGR32:
 501         case IPU_PIX_FMT_RGB32:
 502                 return IPU_COLORSPACE_RGB;
 503         default:
 504                 return IPU_COLORSPACE_YCBCR;
 505         }
 506 }
 507
 508 static int ipu_ic_init_prpenc(struct ipu *ipu,
 509                               union ipu_channel_param *params, bool src_is_csi)
 510 {
 511         uint32_t reg, ic_conf;
 512         uint32_t downsize_coeff, resize_coeff;
 513         enum ipu_color_space in_fmt, out_fmt;
 514
 515         /* Setup vertical resizing */
 516         calc_resize_coeffs(params->video.in_height,
 517                             params->video.out_height,
 518                             &resize_coeff, &downsize_coeff);
 519         reg = (downsize_coeff << 30) | (resize_coeff << 16);
 520
 521         /* Setup horizontal resizing */
 522         calc_resize_coeffs(params->video.in_width,
 523                             params->video.out_width,
 524                             &resize_coeff, &downsize_coeff);
 525         reg |= (downsize_coeff << 14) | resize_coeff;
 526
 527         /* Setup color space conversion */
 528         in_fmt = format_to_colorspace(params->video.in_pixel_fmt);
 529         out_fmt = format_to_colorspace(params->video.out_pixel_fmt);
 530
 531         /*
 532          * Colourspace conversion unsupported yet - see _init_csc() in
 533          * Freescale sources
 534          */
 535         if (in_fmt != out_fmt) {
 536                 dev_err(ipu->dev, "Colourspace conversion unsupported!\n");
 537                 return -EOPNOTSUPP;
 538         }
 539
 540         idmac_write_icreg(ipu, reg, IC_PRP_ENC_RSC);
 541
 542         ic_conf = idmac_read_icreg(ipu, IC_CONF);
 543
 544         if (src_is_csi)
 545                 ic_conf &= ~IC_CONF_RWS_EN;
 546         else
 547                 ic_conf |= IC_CONF_RWS_EN;
 548
 549         idmac_write_icreg(ipu, ic_conf, IC_CONF);
 550
 551         return 0;
 552 }
 553
 554 static uint32_t dma_param_addr(uint32_t dma_ch)
 555 {
 556         /* Channel Parameter Memory */
 557         return 0x10000 | (dma_ch << 4);
 558 }
 559
 560 static void ipu_channel_set_priority(struct ipu *ipu, enum ipu_channel channel,
 561                                      bool prio)
 562 {
 563         u32 reg = idmac_read_icreg(ipu, IDMAC_CHA_PRI);
 564
 565         if (prio)
 566                 reg |= 1UL << channel;
 567         else
 568                 reg &= ~(1UL << channel);
 569
 570         idmac_write_icreg(ipu, reg, IDMAC_CHA_PRI);
 571
 572         dump_idmac_reg(ipu);
 573 }
 574
 575 static uint32_t ipu_channel_conf_mask(enum ipu_channel channel)
 576 {
 577         uint32_t mask;
 578
 579         switch (channel) {
 580         case IDMAC_IC_0:
 581         case IDMAC_IC_7:
 582                 mask = IPU_CONF_CSI_EN | IPU_CONF_IC_EN;
 583                 break;
 584         case IDMAC_SDC_0:
 585         case IDMAC_SDC_1:
 586                 mask = IPU_CONF_SDC_EN | IPU_CONF_DI_EN;
 587                 break;
 588         default:
 589                 mask = 0;
 590                 break;
 591         }
 592
 593         return mask;
 594 }
 595
 596 /**
 597  * ipu_enable_channel() - enable an IPU channel.
 598  * @idmac:      IPU DMAC context.
 599  * @ichan:      IDMAC channel.
 600  * @return:     0 on success or negative error code on failure.
 601  */
 602 static int ipu_enable_channel(struct idmac *idmac, struct idmac_channel *ichan)
 603 {
 604         struct ipu *ipu = to_ipu(idmac);
 605         enum ipu_channel channel = ichan->dma_chan.chan_id;
 606         uint32_t reg;
 607         unsigned long flags;
 608
 609         spin_lock_irqsave(&ipu->lock, flags);
 610
 611         /* Reset to buffer 0 */
 612         idmac_write_ipureg(ipu, 1UL << channel, IPU_CHA_CUR_BUF);
 613         ichan->active_buffer = 0;
 614         ichan->status = IPU_CHANNEL_ENABLED;
 615
 616         switch (channel) {
 617         case IDMAC_SDC_0:
 618         case IDMAC_SDC_1:
 619         case IDMAC_IC_7:
 620                 ipu_channel_set_priority(ipu, channel, true);
 621                 break;
 622         default:
 623                 break;
 624         }
 625
 626         reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
 627
 628         idmac_write_icreg(ipu, reg | (1UL << channel), IDMAC_CHA_EN);
 629
 630         ipu_ic_enable_task(ipu, channel);
 631
 632         spin_unlock_irqrestore(&ipu->lock, flags);
 633         return 0;
 634 }
 635
 636 /**
 637  * ipu_init_channel_buffer() - initialize a buffer for logical IPU channel.
 638  * @ichan:      IDMAC channel.
 639  * @pixel_fmt:  pixel format of buffer. Pixel format is a FOURCC ASCII code.
 640  * @width:      width of buffer in pixels.
 641  * @height:     height of buffer in pixels.
 642  * @stride:     stride length of buffer in pixels.
 643  * @rot_mode:   rotation mode of buffer. A rotation setting other than
 644  *              IPU_ROTATE_VERT_FLIP should only be used for input buffers of
 645  *              rotation channels.
 646  * @phyaddr_0:  buffer 0 physical address.
 647  * @phyaddr_1:  buffer 1 physical address. Setting this to a value other than
 648  *              NULL enables double buffering mode.
 649  * @return:     0 on success or negative error code on failure.
 650  */
 651 static int ipu_init_channel_buffer(struct idmac_channel *ichan,
 652                                    enum pixel_fmt pixel_fmt,
 653                                    uint16_t width, uint16_t height,
 654                                    uint32_t stride,
 655                                    enum ipu_rotate_mode rot_mode,
 656                                    dma_addr_t phyaddr_0, dma_addr_t phyaddr_1)
 657 {
 658         enum ipu_channel channel = ichan->dma_chan.chan_id;
 659         struct idmac *idmac = to_idmac(ichan->dma_chan.device);
 660         struct ipu *ipu = to_ipu(idmac);
 661         union chan_param_mem params = {};
 662         unsigned long flags;
 663         uint32_t reg;
 664         uint32_t stride_bytes;
 665
 666         stride_bytes = stride * bytes_per_pixel(pixel_fmt);
 667
 668         if (stride_bytes % 4) {
 669                 dev_err(ipu->dev,
 670                         "Stride length must be 32-bit aligned, stride = %d, bytes = %d\n",
 671                         stride, stride_bytes);
 672                 return -EINVAL;
 673         }
 674
 675         /* IC channel's stride must be a multiple of 8 pixels */
 676         if ((channel <= IDMAC_IC_13) && (stride % 8)) {
 677                 dev_err(ipu->dev, "Stride must be 8 pixel multiple\n");
 678                 return -EINVAL;
 679         }
 680
 681         /* Build parameter memory data for DMA channel */
 682         ipu_ch_param_set_size(&params, pixel_fmt, width, height, stride_bytes);
 683         ipu_ch_param_set_buffer(&params, phyaddr_0, phyaddr_1);
 684         ipu_ch_param_set_rotation(&params, rot_mode);
 685
 686         spin_lock_irqsave(&ipu->lock, flags);
 687
 688         ipu_write_param_mem(dma_param_addr(channel), (uint32_t *)&params, 10);
 689
 690         reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
 691
 692         if (phyaddr_1)
 693                 reg |= 1UL << channel;
 694         else
 695                 reg &= ~(1UL << channel);
 696
 697         idmac_write_ipureg(ipu, reg, IPU_CHA_DB_MODE_SEL);
 698
 699         ichan->status = IPU_CHANNEL_READY;
 700
 701         spin_unlock_irqrestore(&ipu->lock, flags);
 702
 703         return 0;
 704 }
 705
 706 /**
 707  * ipu_select_buffer() - mark a channel's buffer as ready.
 708  * @channel:    channel ID.
 709  * @buffer_n:   buffer number to mark ready.
 710  */
 711 static void ipu_select_buffer(enum ipu_channel channel, int buffer_n)
 712 {
 713         /* No locking - this is a write-one-to-set register, cleared by IPU */
 714         if (buffer_n == 0)
 715                 /* Mark buffer 0 as ready. */
 716                 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF0_RDY);
 717         else
 718                 /* Mark buffer 1 as ready. */
 719                 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF1_RDY);
 720 }
 721
 722 /**
 723  * ipu_update_channel_buffer() - update physical address of a channel buffer.
 724  * @ichan:      IDMAC channel.
 725  * @buffer_n:   buffer number to update.
 726  *              0 or 1 are the only valid values.
 727  * @phyaddr:    buffer physical address.
 728  */
 729 /* Called under spin_lock(_irqsave)(&ichan->lock) */
 730 static void ipu_update_channel_buffer(struct idmac_channel *ichan,
 731                                       int buffer_n, dma_addr_t phyaddr)
 732 {
 733         enum ipu_channel channel = ichan->dma_chan.chan_id;
 734         uint32_t reg;
 735         unsigned long flags;
 736
 737         spin_lock_irqsave(&ipu_data.lock, flags);
 738
 739         if (buffer_n == 0) {
 740                 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
 741                 if (reg & (1UL << channel)) {
 742                         ipu_ic_disable_task(&ipu_data, channel);
 743                         ichan->status = IPU_CHANNEL_READY;
 744                 }
 745
 746                 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 0) */
 747                 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
 748                                    0x0008UL, IPU_IMA_ADDR);
 749                 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
 750         } else {
 751                 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
 752                 if (reg & (1UL << channel)) {
 753                         ipu_ic_disable_task(&ipu_data, channel);
 754                         ichan->status = IPU_CHANNEL_READY;
 755                 }
 756
 757                 /* Check if double-buffering is already enabled */
 758                 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_DB_MODE_SEL);
 759
 760                 if (!(reg & (1UL << channel)))
 761                         idmac_write_ipureg(&ipu_data, reg | (1UL << channel),
 762                                            IPU_CHA_DB_MODE_SEL);
 763
 764                 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 1) */
 765                 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
 766                                    0x0009UL, IPU_IMA_ADDR);
 767                 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
 768         }
 769
 770         spin_unlock_irqrestore(&ipu_data.lock, flags);
 771 }
 772
 773 /* Called under spin_lock_irqsave(&ichan->lock) */
 774 static int ipu_submit_buffer(struct idmac_channel *ichan,
 775         struct idmac_tx_desc *desc, struct scatterlist *sg, int buf_idx)
 776 {
 777         unsigned int chan_id = ichan->dma_chan.chan_id;
 778         struct device *dev = &ichan->dma_chan.dev->device;
 779
 780         if (async_tx_test_ack(&desc->txd))
 781                 return -EINTR;
 782
 783         /*
 784          * On first invocation this shouldn't be necessary, the call to
 785          * ipu_init_channel_buffer() above will set addresses for us, so we
 786          * could make it conditional on status >= IPU_CHANNEL_ENABLED, but
 787          * doing it again shouldn't hurt either.
 788          */
 789         ipu_update_channel_buffer(ichan, buf_idx, sg_dma_address(sg));
 790
 791         ipu_select_buffer(chan_id, buf_idx);
 792         dev_dbg(dev, "Updated sg %p on channel 0x%x buffer %d\n",
 793                 sg, chan_id, buf_idx);
 794
 795         return 0;
 796 }
 797
 798 /* Called under spin_lock_irqsave(&ichan->lock) */
 799 static int ipu_submit_channel_buffers(struct idmac_channel *ichan,
 800                                       struct idmac_tx_desc *desc)
 801 {
 802         struct scatterlist *sg;
 803         int i, ret = 0;
 804
 805         for (i = 0, sg = desc->sg; i < 2 && sg; i++) {
 806                 if (!ichan->sg[i]) {
 807                         ichan->sg[i] = sg;
 808
 809                         ret = ipu_submit_buffer(ichan, desc, sg, i);
 810                         if (ret < 0)
 811                                 return ret;
 812
 813                         sg = sg_next(sg);
 814                 }
 815         }
 816
 817         return ret;
 818 }
 819
 820 static dma_cookie_t idmac_tx_submit(struct dma_async_tx_descriptor *tx)
 821 {
 822         struct idmac_tx_desc *desc = to_tx_desc(tx);
 823         struct idmac_channel *ichan = to_idmac_chan(tx->chan);
 824         struct idmac *idmac = to_idmac(tx->chan->device);
 825         struct ipu *ipu = to_ipu(idmac);
 826         struct device *dev = &ichan->dma_chan.dev->device;
 827         dma_cookie_t cookie;
 828         unsigned long flags;
 829         int ret;
 830
 831         /* Sanity check */
 832         if (!list_empty(&desc->list)) {
 833                 /* The descriptor doesn't belong to client */
 834                 dev_err(dev, "Descriptor %p not prepared!\n", tx);
 835                 return -EBUSY;
 836         }
 837
 838         mutex_lock(&ichan->chan_mutex);
 839
 840         async_tx_clear_ack(tx);
 841
 842         if (ichan->status < IPU_CHANNEL_READY) {
 843                 struct idmac_video_param *video = &ichan->params.video;
 844                 /*
 845                  * Initial buffer assignment - the first two sg-entries from
 846                  * the descriptor will end up in the IDMAC buffers
 847                  */
 848                 dma_addr_t dma_1 = sg_is_last(desc->sg) ? 0 :
 849                         sg_dma_address(&desc->sg[1]);
 850
 851                 WARN_ON(ichan->sg[0] || ichan->sg[1]);
 852
 853                 cookie = ipu_init_channel_buffer(ichan,
 854                                                  video->out_pixel_fmt,
 855                                                  video->out_width,
 856                                                  video->out_height,
 857                                                  video->out_stride,
 858                                                  IPU_ROTATE_NONE,
 859                                                  sg_dma_address(&desc->sg[0]),
 860                                                  dma_1);
 861                 if (cookie < 0)
 862                         goto out;
 863         }
 864
 865         dev_dbg(dev, "Submitting sg %p\n", &desc->sg[0]);
 866
 867         cookie = dma_cookie_assign(tx);
 868
 869         /* ipu->lock can be taken under ichan->lock, but not v.v. */
 870         spin_lock_irqsave(&ichan->lock, flags);
 871
 872         list_add_tail(&desc->list, &ichan->queue);
 873         /* submit_buffers() atomically verifies and fills empty sg slots */
 874         ret = ipu_submit_channel_buffers(ichan, desc);
 875
 876         spin_unlock_irqrestore(&ichan->lock, flags);
 877
 878         if (ret < 0) {
 879                 cookie = ret;
 880                 goto dequeue;
 881         }
 882
 883         if (ichan->status < IPU_CHANNEL_ENABLED) {
 884                 ret = ipu_enable_channel(idmac, ichan);
 885                 if (ret < 0) {
 886                         cookie = ret;
 887                         goto dequeue;
 888                 }
 889         }
 890
 891         dump_idmac_reg(ipu);
 892
 893 dequeue:
 894         if (cookie < 0) {
 895                 spin_lock_irqsave(&ichan->lock, flags);
 896                 list_del_init(&desc->list);
 897                 spin_unlock_irqrestore(&ichan->lock, flags);
 898                 tx->cookie = cookie;
 899                 ichan->dma_chan.cookie = cookie;
 900         }
 901
 902 out:
 903         mutex_unlock(&ichan->chan_mutex);
 904
 905         return cookie;
 906 }
 907
 908 /* Called with ichan->chan_mutex held */
 909 static int idmac_desc_alloc(struct idmac_channel *ichan, int n)
 910 {
 911         struct idmac_tx_desc *desc =
 912                 vmalloc(array_size(n, sizeof(struct idmac_tx_desc)));
 913         struct idmac *idmac = to_idmac(ichan->dma_chan.device);
 914
 915         if (!desc)
 916                 return -ENOMEM;
 917
 918         /* No interrupts, just disable the tasklet for a moment */
 919         tasklet_disable(&to_ipu(idmac)->tasklet);
 920
 921         ichan->n_tx_desc = n;
 922         ichan->desc = desc;
 923         INIT_LIST_HEAD(&ichan->queue);
 924         INIT_LIST_HEAD(&ichan->free_list);
 925
 926         while (n--) {
 927                 struct dma_async_tx_descriptor *txd = &desc->txd;
 928
 929                 memset(txd, 0, sizeof(*txd));
 930                 dma_async_tx_descriptor_init(txd, &ichan->dma_chan);
 931                 txd->tx_submit          = idmac_tx_submit;
 932
 933                 list_add(&desc->list, &ichan->free_list);
 934
 935                 desc++;
 936         }
 937
 938         tasklet_enable(&to_ipu(idmac)->tasklet);
 939
 940         return 0;
 941 }
 942
 943 /**
 944  * ipu_init_channel() - initialize an IPU channel.
 945  * @idmac:      IPU DMAC context.
 946  * @ichan:      pointer to the channel object.
 947  * @return      0 on success or negative error code on failure.
 948  */
 949 static int ipu_init_channel(struct idmac *idmac, struct idmac_channel *ichan)
 950 {
 951         union ipu_channel_param *params = &ichan->params;
 952         uint32_t ipu_conf;
 953         enum ipu_channel channel = ichan->dma_chan.chan_id;
 954         unsigned long flags;
 955         uint32_t reg;
 956         struct ipu *ipu = to_ipu(idmac);
 957         int ret = 0, n_desc = 0;
 958
 959         dev_dbg(ipu->dev, "init channel = %d\n", channel);
 960
 961         if (channel != IDMAC_SDC_0 && channel != IDMAC_SDC_1 &&
 962             channel != IDMAC_IC_7)
 963                 return -EINVAL;
 964
 965         spin_lock_irqsave(&ipu->lock, flags);
 966
 967         switch (channel) {
 968         case IDMAC_IC_7:
 969                 n_desc = 16;
 970                 reg = idmac_read_icreg(ipu, IC_CONF);
 971                 idmac_write_icreg(ipu, reg & ~IC_CONF_CSI_MEM_WR_EN, IC_CONF);
 972                 break;
 973         case IDMAC_IC_0:
 974                 n_desc = 16;
 975                 reg = idmac_read_ipureg(ipu, IPU_FS_PROC_FLOW);
 976                 idmac_write_ipureg(ipu, reg & ~FS_ENC_IN_VALID, IPU_FS_PROC_FLOW);
 977                 ret = ipu_ic_init_prpenc(ipu, params, true);
 978                 break;
 979         case IDMAC_SDC_0:
 980         case IDMAC_SDC_1:
 981                 n_desc = 4;
 982                 break;
 983         default:
 984                 break;
 985         }
 986
 987         ipu->channel_init_mask |= 1L << channel;
 988
 989         /* Enable IPU sub module */
 990         ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) |
 991                 ipu_channel_conf_mask(channel);
 992         idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
 993
 994         spin_unlock_irqrestore(&ipu->lock, flags);
 995
 996         if (n_desc && !ichan->desc)
 997                 ret = idmac_desc_alloc(ichan, n_desc);
 998
 999         dump_idmac_reg(ipu);
1000
1001         return ret;
1002 }
1003
1004 /**
1005  * ipu_uninit_channel() - uninitialize an IPU channel.
1006  * @idmac:      IPU DMAC context.
1007  * @ichan:      pointer to the channel object.
1008  */
1009 static void ipu_uninit_channel(struct idmac *idmac, struct idmac_channel *ichan)
1010 {
1011         enum ipu_channel channel = ichan->dma_chan.chan_id;
1012         unsigned long flags;
1013         uint32_t reg;
1014         unsigned long chan_mask = 1UL << channel;
1015         uint32_t ipu_conf;
1016         struct ipu *ipu = to_ipu(idmac);
1017
1018         spin_lock_irqsave(&ipu->lock, flags);
1019
1020         if (!(ipu->channel_init_mask & chan_mask)) {
1021                 dev_err(ipu->dev, "Channel already uninitialized %d\n",
1022                         channel);
1023                 spin_unlock_irqrestore(&ipu->lock, flags);
1024                 return;
1025         }
1026
1027         /* Reset the double buffer */
1028         reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
1029         idmac_write_ipureg(ipu, reg & ~chan_mask, IPU_CHA_DB_MODE_SEL);
1030
1031         ichan->sec_chan_en = false;
1032
1033         switch (channel) {
1034         case IDMAC_IC_7:
1035                 reg = idmac_read_icreg(ipu, IC_CONF);
1036                 idmac_write_icreg(ipu, reg & ~(IC_CONF_RWS_EN | IC_CONF_PRPENC_EN),
1037                              IC_CONF);
1038                 break;
1039         case IDMAC_IC_0:
1040                 reg = idmac_read_icreg(ipu, IC_CONF);
1041                 idmac_write_icreg(ipu, reg & ~(IC_CONF_PRPENC_EN | IC_CONF_PRPENC_CSC1),
1042                                   IC_CONF);
1043                 break;
1044         case IDMAC_SDC_0:
1045         case IDMAC_SDC_1:
1046         default:
1047                 break;
1048         }
1049
1050         ipu->channel_init_mask &= ~(1L << channel);
1051
1052         ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) &
1053                 ~ipu_channel_conf_mask(channel);
1054         idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
1055
1056         spin_unlock_irqrestore(&ipu->lock, flags);
1057
1058         ichan->n_tx_desc = 0;
1059         vfree(ichan->desc);
1060         ichan->desc = NULL;
1061 }
1062
1063 /**
1064  * ipu_disable_channel() - disable an IPU channel.
1065  * @idmac:              IPU DMAC context.
1066  * @ichan:              channel object pointer.
1067  * @wait_for_stop:      flag to set whether to wait for channel end of frame or
1068  *                      return immediately.
1069  * @return:             0 on success or negative error code on failure.
1070  */
1071 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
1072                                bool wait_for_stop)
1073 {
1074         enum ipu_channel channel = ichan->dma_chan.chan_id;
1075         struct ipu *ipu = to_ipu(idmac);
1076         uint32_t reg;
1077         unsigned long flags;
1078         unsigned long chan_mask = 1UL << channel;
1079         unsigned int timeout;
1080
1081         if (wait_for_stop && channel != IDMAC_SDC_1 && channel != IDMAC_SDC_0) {
1082                 timeout = 40;
1083                 /* This waiting always fails. Related to spurious irq problem */
1084                 while ((idmac_read_icreg(ipu, IDMAC_CHA_BUSY) & chan_mask) ||
1085                        (ipu_channel_status(ipu, channel) == TASK_STAT_ACTIVE)) {
1086                         timeout--;
1087                         msleep(10);
1088
1089                         if (!timeout) {
1090                                 dev_dbg(ipu->dev,
1091                                         "Warning: timeout waiting for channel %u to "
1092                                         "stop: buf0_rdy = 0x%08X, buf1_rdy = 0x%08X, "
1093                                         "busy = 0x%08X, tstat = 0x%08X\n", channel,
1094                                         idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
1095                                         idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
1096                                         idmac_read_icreg(ipu, IDMAC_CHA_BUSY),
1097                                         idmac_read_ipureg(ipu, IPU_TASKS_STAT));
1098                                 break;
1099                         }
1100                 }
1101                 dev_dbg(ipu->dev, "timeout = %d * 10ms\n", 40 - timeout);
1102         }
1103         /* SDC BG and FG must be disabled before DMA is disabled */
1104         if (wait_for_stop && (channel == IDMAC_SDC_0 ||
1105                               channel == IDMAC_SDC_1)) {
1106                 for (timeout = 5;
1107                      timeout && !ipu_irq_status(ichan->eof_irq); timeout--)
1108                         msleep(5);
1109         }
1110
1111         spin_lock_irqsave(&ipu->lock, flags);
1112
1113         /* Disable IC task */
1114         ipu_ic_disable_task(ipu, channel);
1115
1116         /* Disable DMA channel(s) */
1117         reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
1118         idmac_write_icreg(ipu, reg & ~chan_mask, IDMAC_CHA_EN);
1119
1120         spin_unlock_irqrestore(&ipu->lock, flags);
1121
1122         return 0;
1123 }
1124
1125 static struct scatterlist *idmac_sg_next(struct idmac_channel *ichan,
1126         struct idmac_tx_desc **desc, struct scatterlist *sg)
1127 {
1128         struct scatterlist *sgnew = sg ? sg_next(sg) : NULL;
1129
1130         if (sgnew)
1131                 /* next sg-element in this list */
1132                 return sgnew;
1133
1134         if ((*desc)->list.next == &ichan->queue)
1135                 /* No more descriptors on the queue */
1136                 return NULL;
1137
1138         /* Fetch next descriptor */
1139         *desc = list_entry((*desc)->list.next, struct idmac_tx_desc, list);
1140         return (*desc)->sg;
1141 }
1142
1143 /*
1144  * We have several possibilities here:
1145  * current BUF          next BUF
1146  *
1147  * not last sg          next not last sg
1148  * not last sg          next last sg
1149  * last sg              first sg from next descriptor
1150  * last sg              NULL
1151  *
1152  * Besides, the descriptor queue might be empty or not. We process all these
1153  * cases carefully.
1154  */
1155 static irqreturn_t idmac_interrupt(int irq, void *dev_id)
1156 {
1157         struct idmac_channel *ichan = dev_id;
1158         struct device *dev = &ichan->dma_chan.dev->device;
1159         unsigned int chan_id = ichan->dma_chan.chan_id;
1160         struct scatterlist **sg, *sgnext, *sgnew = NULL;
1161         /* Next transfer descriptor */
1162         struct idmac_tx_desc *desc, *descnew;
1163         bool done = false;
1164         u32 ready0, ready1, curbuf, err;
1165         struct dmaengine_desc_callback cb;
1166
1167         /* IDMAC has cleared the respective BUFx_RDY bit, we manage the buffer */
1168
1169         dev_dbg(dev, "IDMAC irq %d, buf %d\n", irq, ichan->active_buffer);
1170
1171         spin_lock(&ipu_data.lock);
1172
1173         ready0  = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
1174         ready1  = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
1175         curbuf  = idmac_read_ipureg(&ipu_data, IPU_CHA_CUR_BUF);
1176         err     = idmac_read_ipureg(&ipu_data, IPU_INT_STAT_4);
1177
1178         if (err & (1 << chan_id)) {
1179                 idmac_write_ipureg(&ipu_data, 1 << chan_id, IPU_INT_STAT_4);
1180                 spin_unlock(&ipu_data.lock);
1181                 /*
1182                  * Doing this
1183                  * ichan->sg[0] = ichan->sg[1] = NULL;
1184                  * you can force channel re-enable on the next tx_submit(), but
1185                  * this is dirty - think about descriptors with multiple
1186                  * sg elements.
1187                  */
1188                 dev_warn(dev, "NFB4EOF on channel %d, ready %x, %x, cur %x\n",
1189                          chan_id, ready0, ready1, curbuf);
1190                 return IRQ_HANDLED;
1191         }
1192         spin_unlock(&ipu_data.lock);
1193
1194         /* Other interrupts do not interfere with this channel */
1195         spin_lock(&ichan->lock);
1196         if (unlikely((ichan->active_buffer && (ready1 >> chan_id) & 1) ||
1197                      (!ichan->active_buffer && (ready0 >> chan_id) & 1)
1198                      )) {
1199                 spin_unlock(&ichan->lock);
1200                 dev_dbg(dev,
1201                         "IRQ with active buffer still ready on channel %x, "
1202                         "active %d, ready %x, %x!\n", chan_id,
1203                         ichan->active_buffer, ready0, ready1);
1204                 return IRQ_NONE;
1205         }
1206
1207         if (unlikely(list_empty(&ichan->queue))) {
1208                 ichan->sg[ichan->active_buffer] = NULL;
1209                 spin_unlock(&ichan->lock);
1210                 dev_err(dev,
1211                         "IRQ without queued buffers on channel %x, active %d, "
1212                         "ready %x, %x!\n", chan_id,
1213                         ichan->active_buffer, ready0, ready1);
1214                 return IRQ_NONE;
1215         }
1216
1217         /*
1218          * active_buffer is a software flag, it shows which buffer we are
1219          * currently expecting back from the hardware, IDMAC should be
1220          * processing the other buffer already
1221          */
1222         sg = &ichan->sg[ichan->active_buffer];
1223         sgnext = ichan->sg[!ichan->active_buffer];
1224
1225         if (!*sg) {
1226                 spin_unlock(&ichan->lock);
1227                 return IRQ_HANDLED;
1228         }
1229
1230         desc = list_entry(ichan->queue.next, struct idmac_tx_desc, list);
1231         descnew = desc;
1232
1233         dev_dbg(dev, "IDMAC irq %d, dma %#llx, next dma %#llx, current %d, curbuf %#x\n",
1234                 irq, (u64)sg_dma_address(*sg),
1235                 sgnext ? (u64)sg_dma_address(sgnext) : 0,
1236                 ichan->active_buffer, curbuf);
1237
1238         /* Find the descriptor of sgnext */
1239         sgnew = idmac_sg_next(ichan, &descnew, *sg);
1240         if (sgnext != sgnew)
1241                 dev_err(dev, "Submitted buffer %p, next buffer %p\n", sgnext, sgnew);
1242
1243         /*
1244          * if sgnext == NULL sg must be the last element in a scatterlist and
1245          * queue must be empty
1246          */
1247         if (unlikely(!sgnext)) {
1248                 if (!WARN_ON(sg_next(*sg)))
1249                         dev_dbg(dev, "Underrun on channel %x\n", chan_id);
1250                 ichan->sg[!ichan->active_buffer] = sgnew;
1251
1252                 if (unlikely(sgnew)) {
1253                         ipu_submit_buffer(ichan, descnew, sgnew, !ichan->active_buffer);
1254                 } else {
1255                         spin_lock(&ipu_data.lock);
1256                         ipu_ic_disable_task(&ipu_data, chan_id);
1257                         spin_unlock(&ipu_data.lock);
1258                         ichan->status = IPU_CHANNEL_READY;
1259                         /* Continue to check for complete descriptor */
1260                 }
1261         }
1262
1263         /* Calculate and submit the next sg element */
1264         sgnew = idmac_sg_next(ichan, &descnew, sgnew);
1265
1266         if (unlikely(!sg_next(*sg)) || !sgnext) {
1267                 /*
1268                  * Last element in scatterlist done, remove from the queue,
1269                  * _init for debugging
1270                  */
1271                 list_del_init(&desc->list);
1272                 done = true;
1273         }
1274
1275         *sg = sgnew;
1276
1277         if (likely(sgnew) &&
1278             ipu_submit_buffer(ichan, descnew, sgnew, ichan->active_buffer) < 0) {
1279                 dmaengine_desc_get_callback(&descnew->txd, &cb);
1280
1281                 list_del_init(&descnew->list);
1282                 spin_unlock(&ichan->lock);
1283
1284                 dmaengine_desc_callback_invoke(&cb, NULL);
1285                 spin_lock(&ichan->lock);
1286         }
1287
1288         /* Flip the active buffer - even if update above failed */
1289         ichan->active_buffer = !ichan->active_buffer;
1290         if (done)
1291                 dma_cookie_complete(&desc->txd);
1292
1293         dmaengine_desc_get_callback(&desc->txd, &cb);
1294
1295         spin_unlock(&ichan->lock);
1296
1297         if (done && (desc->txd.flags & DMA_PREP_INTERRUPT))
1298                 dmaengine_desc_callback_invoke(&cb, NULL);
1299
1300         return IRQ_HANDLED;
1301 }
1302
1303 static void ipu_gc_tasklet(struct tasklet_struct *t)
1304 {
1305         struct ipu *ipu = from_tasklet(ipu, t, tasklet);
1306         int i;
1307
1308         for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1309                 struct idmac_channel *ichan = ipu->channel + i;
1310                 struct idmac_tx_desc *desc;
1311                 unsigned long flags;
1312                 struct scatterlist *sg;
1313                 int j, k;
1314
1315                 for (j = 0; j < ichan->n_tx_desc; j++) {
1316                         desc = ichan->desc + j;
1317                         spin_lock_irqsave(&ichan->lock, flags);
1318                         if (async_tx_test_ack(&desc->txd)) {
1319                                 list_move(&desc->list, &ichan->free_list);
1320                                 for_each_sg(desc->sg, sg, desc->sg_len, k) {
1321                                         if (ichan->sg[0] == sg)
1322                                                 ichan->sg[0] = NULL;
1323                                         else if (ichan->sg[1] == sg)
1324                                                 ichan->sg[1] = NULL;
1325                                 }
1326                                 async_tx_clear_ack(&desc->txd);
1327                         }
1328                         spin_unlock_irqrestore(&ichan->lock, flags);
1329                 }
1330         }
1331 }
1332
1333 /* Allocate and initialise a transfer descriptor. */
1334 static struct dma_async_tx_descriptor *idmac_prep_slave_sg(struct dma_chan *chan,
1335                 struct scatterlist *sgl, unsigned int sg_len,
1336                 enum dma_transfer_direction direction, unsigned long tx_flags,
1337                 void *context)
1338 {
1339         struct idmac_channel *ichan = to_idmac_chan(chan);
1340         struct idmac_tx_desc *desc = NULL;
1341         struct dma_async_tx_descriptor *txd = NULL;
1342         unsigned long flags;
1343
1344         /* We only can handle these three channels so far */
1345         if (chan->chan_id != IDMAC_SDC_0 && chan->chan_id != IDMAC_SDC_1 &&
1346             chan->chan_id != IDMAC_IC_7)
1347                 return NULL;
1348
1349         if (!is_slave_direction(direction)) {
1350                 dev_err(chan->device->dev, "Invalid DMA direction %d!\n", direction);
1351                 return NULL;
1352         }
1353
1354         mutex_lock(&ichan->chan_mutex);
1355
1356         spin_lock_irqsave(&ichan->lock, flags);
1357         if (!list_empty(&ichan->free_list)) {
1358                 desc = list_entry(ichan->free_list.next,
1359                                   struct idmac_tx_desc, list);
1360
1361                 list_del_init(&desc->list);
1362
1363                 desc->sg_len    = sg_len;
1364                 desc->sg        = sgl;
1365                 txd             = &desc->txd;
1366                 txd->flags      = tx_flags;
1367         }
1368         spin_unlock_irqrestore(&ichan->lock, flags);
1369
1370         mutex_unlock(&ichan->chan_mutex);
1371
1372         tasklet_schedule(&to_ipu(to_idmac(chan->device))->tasklet);
1373
1374         return txd;
1375 }
1376
1377 /* Re-select the current buffer and re-activate the channel */
1378 static void idmac_issue_pending(struct dma_chan *chan)
1379 {
1380         struct idmac_channel *ichan = to_idmac_chan(chan);
1381         struct idmac *idmac = to_idmac(chan->device);
1382         struct ipu *ipu = to_ipu(idmac);
1383         unsigned long flags;
1384
1385         /* This is not always needed, but doesn't hurt either */
1386         spin_lock_irqsave(&ipu->lock, flags);
1387         ipu_select_buffer(chan->chan_id, ichan->active_buffer);
1388         spin_unlock_irqrestore(&ipu->lock, flags);
1389
1390         /*
1391          * Might need to perform some parts of initialisation from
1392          * ipu_enable_channel(), but not all, we do not want to reset to buffer
1393          * 0, don't need to set priority again either, but re-enabling the task
1394          * and the channel might be a good idea.
1395          */
1396 }
1397
1398 static int idmac_pause(struct dma_chan *chan)
1399 {
1400         struct idmac_channel *ichan = to_idmac_chan(chan);
1401         struct idmac *idmac = to_idmac(chan->device);
1402         struct ipu *ipu = to_ipu(idmac);
1403         struct list_head *list, *tmp;
1404         unsigned long flags;
1405
1406         mutex_lock(&ichan->chan_mutex);
1407
1408         spin_lock_irqsave(&ipu->lock, flags);
1409         ipu_ic_disable_task(ipu, chan->chan_id);
1410
1411         /* Return all descriptors into "prepared" state */
1412         list_for_each_safe(list, tmp, &ichan->queue)
1413                 list_del_init(list);
1414
1415         ichan->sg[0] = NULL;
1416         ichan->sg[1] = NULL;
1417
1418         spin_unlock_irqrestore(&ipu->lock, flags);
1419
1420         ichan->status = IPU_CHANNEL_INITIALIZED;
1421
1422         mutex_unlock(&ichan->chan_mutex);
1423
1424         return 0;
1425 }
1426
1427 static int __idmac_terminate_all(struct dma_chan *chan)
1428 {
1429         struct idmac_channel *ichan = to_idmac_chan(chan);
1430         struct idmac *idmac = to_idmac(chan->device);
1431         struct ipu *ipu = to_ipu(idmac);
1432         unsigned long flags;
1433         int i;
1434
1435         ipu_disable_channel(idmac, ichan,
1436                             ichan->status >= IPU_CHANNEL_ENABLED);
1437
1438         tasklet_disable(&ipu->tasklet);
1439
1440         /* ichan->queue is modified in ISR, have to spinlock */
1441         spin_lock_irqsave(&ichan->lock, flags);
1442         list_splice_init(&ichan->queue, &ichan->free_list);
1443
1444         if (ichan->desc)
1445                 for (i = 0; i < ichan->n_tx_desc; i++) {
1446                         struct idmac_tx_desc *desc = ichan->desc + i;
1447                         if (list_empty(&desc->list))
1448                                 /* Descriptor was prepared, but not submitted */
1449                                 list_add(&desc->list, &ichan->free_list);
1450
1451                         async_tx_clear_ack(&desc->txd);
1452                 }
1453
1454         ichan->sg[0] = NULL;
1455         ichan->sg[1] = NULL;
1456         spin_unlock_irqrestore(&ichan->lock, flags);
1457
1458         tasklet_enable(&ipu->tasklet);
1459
1460         ichan->status = IPU_CHANNEL_INITIALIZED;
1461
1462         return 0;
1463 }
1464
1465 static int idmac_terminate_all(struct dma_chan *chan)
1466 {
1467         struct idmac_channel *ichan = to_idmac_chan(chan);
1468         int ret;
1469
1470         mutex_lock(&ichan->chan_mutex);
1471
1472         ret = __idmac_terminate_all(chan);
1473
1474         mutex_unlock(&ichan->chan_mutex);
1475
1476         return ret;
1477 }
1478
1479 #ifdef DEBUG
1480 static irqreturn_t ic_sof_irq(int irq, void *dev_id)
1481 {
1482         struct idmac_channel *ichan = dev_id;
1483         printk(KERN_DEBUG "Got SOF IRQ %d on Channel %d\n",
1484                irq, ichan->dma_chan.chan_id);
1485         disable_irq_nosync(irq);
1486         return IRQ_HANDLED;
1487 }
1488
1489 static irqreturn_t ic_eof_irq(int irq, void *dev_id)
1490 {
1491         struct idmac_channel *ichan = dev_id;
1492         printk(KERN_DEBUG "Got EOF IRQ %d on Channel %d\n",
1493                irq, ichan->dma_chan.chan_id);
1494         disable_irq_nosync(irq);
1495         return IRQ_HANDLED;
1496 }
1497
1498 static int ic_sof = -EINVAL, ic_eof = -EINVAL;
1499 #endif
1500
1501 static int idmac_alloc_chan_resources(struct dma_chan *chan)
1502 {
1503         struct idmac_channel *ichan = to_idmac_chan(chan);
1504         struct idmac *idmac = to_idmac(chan->device);
1505         int ret;
1506
1507         /* dmaengine.c now guarantees to only offer free channels */
1508         BUG_ON(chan->client_count > 1);
1509         WARN_ON(ichan->status != IPU_CHANNEL_FREE);
1510
1511         dma_cookie_init(chan);
1512
1513         ret = ipu_irq_map(chan->chan_id);
1514         if (ret < 0)
1515                 goto eimap;
1516
1517         ichan->eof_irq = ret;
1518
1519         /*
1520          * Important to first disable the channel, because maybe someone
1521          * used it before us, e.g., the bootloader
1522          */
1523         ipu_disable_channel(idmac, ichan, true);
1524
1525         ret = ipu_init_channel(idmac, ichan);
1526         if (ret < 0)
1527                 goto eichan;
1528
1529         ret = request_irq(ichan->eof_irq, idmac_interrupt, 0,
1530                           ichan->eof_name, ichan);
1531         if (ret < 0)
1532                 goto erirq;
1533
1534 #ifdef DEBUG
1535         if (chan->chan_id == IDMAC_IC_7) {
1536                 ic_sof = ipu_irq_map(69);
1537                 if (ic_sof > 0) {
1538                         ret = request_irq(ic_sof, ic_sof_irq, 0, "IC SOF", ichan);
1539                         if (ret)
1540                                 dev_err(&chan->dev->device, "request irq failed for IC SOF");
1541                 }
1542                 ic_eof = ipu_irq_map(70);
1543                 if (ic_eof > 0) {
1544                         ret = request_irq(ic_eof, ic_eof_irq, 0, "IC EOF", ichan);
1545                         if (ret)
1546                                 dev_err(&chan->dev->device, "request irq failed for IC EOF");
1547                 }
1548         }
1549 #endif
1550
1551         ichan->status = IPU_CHANNEL_INITIALIZED;
1552
1553         dev_dbg(&chan->dev->device, "Found channel 0x%x, irq %d\n",
1554                 chan->chan_id, ichan->eof_irq);
1555
1556         return ret;
1557
1558 erirq:
1559         ipu_uninit_channel(idmac, ichan);
1560 eichan:
1561         ipu_irq_unmap(chan->chan_id);
1562 eimap:
1563         return ret;
1564 }
1565
1566 static void idmac_free_chan_resources(struct dma_chan *chan)
1567 {
1568         struct idmac_channel *ichan = to_idmac_chan(chan);
1569         struct idmac *idmac = to_idmac(chan->device);
1570
1571         mutex_lock(&ichan->chan_mutex);
1572
1573         __idmac_terminate_all(chan);
1574
1575         if (ichan->status > IPU_CHANNEL_FREE) {
1576 #ifdef DEBUG
1577                 if (chan->chan_id == IDMAC_IC_7) {
1578                         if (ic_sof > 0) {
1579                                 free_irq(ic_sof, ichan);
1580                                 ipu_irq_unmap(69);
1581                                 ic_sof = -EINVAL;
1582                         }
1583                         if (ic_eof > 0) {
1584                                 free_irq(ic_eof, ichan);
1585                                 ipu_irq_unmap(70);
1586                                 ic_eof = -EINVAL;
1587                         }
1588                 }
1589 #endif
1590                 free_irq(ichan->eof_irq, ichan);
1591                 ipu_irq_unmap(chan->chan_id);
1592         }
1593
1594         ichan->status = IPU_CHANNEL_FREE;
1595
1596         ipu_uninit_channel(idmac, ichan);
1597
1598         mutex_unlock(&ichan->chan_mutex);
1599
1600         tasklet_schedule(&to_ipu(idmac)->tasklet);
1601 }
1602
1603 static enum dma_status idmac_tx_status(struct dma_chan *chan,
1604                        dma_cookie_t cookie, struct dma_tx_state *txstate)
1605 {
1606         return dma_cookie_status(chan, cookie, txstate);
1607 }
1608
1609 static int __init ipu_idmac_init(struct ipu *ipu)
1610 {
1611         struct idmac *idmac = &ipu->idmac;
1612         struct dma_device *dma = &idmac->dma;
1613         int i;
1614
1615         dma_cap_set(DMA_SLAVE, dma->cap_mask);
1616         dma_cap_set(DMA_PRIVATE, dma->cap_mask);
1617
1618         /* Compulsory common fields */
1619         dma->dev                                = ipu->dev;
1620         dma->device_alloc_chan_resources        = idmac_alloc_chan_resources;
1621         dma->device_free_chan_resources         = idmac_free_chan_resources;
1622         dma->device_tx_status                   = idmac_tx_status;
1623         dma->device_issue_pending               = idmac_issue_pending;
1624
1625         /* Compulsory for DMA_SLAVE fields */
1626         dma->device_prep_slave_sg               = idmac_prep_slave_sg;
1627         dma->device_pause                       = idmac_pause;
1628         dma->device_terminate_all               = idmac_terminate_all;
1629
1630         INIT_LIST_HEAD(&dma->channels);
1631         for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1632                 struct idmac_channel *ichan = ipu->channel + i;
1633                 struct dma_chan *dma_chan = &ichan->dma_chan;
1634
1635                 spin_lock_init(&ichan->lock);
1636                 mutex_init(&ichan->chan_mutex);
1637
1638                 ichan->status           = IPU_CHANNEL_FREE;
1639                 ichan->sec_chan_en      = false;
1640                 snprintf(ichan->eof_name, sizeof(ichan->eof_name), "IDMAC EOF %d", i);
1641
1642                 dma_chan->device        = &idmac->dma;
1643                 dma_cookie_init(dma_chan);
1644                 dma_chan->chan_id       = i;
1645                 list_add_tail(&dma_chan->device_node, &dma->channels);
1646         }
1647
1648         idmac_write_icreg(ipu, 0x00000070, IDMAC_CONF);
1649
1650         return dma_async_device_register(&idmac->dma);
1651 }
1652
1653 static void ipu_idmac_exit(struct ipu *ipu)
1654 {
1655         int i;
1656         struct idmac *idmac = &ipu->idmac;
1657
1658         for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1659                 struct idmac_channel *ichan = ipu->channel + i;
1660
1661                 idmac_terminate_all(&ichan->dma_chan);
1662         }
1663
1664         dma_async_device_unregister(&idmac->dma);
1665 }
1666
1667 /*****************************************************************************
1668  * IPU common probe / remove
1669  */
1670
1671 static int __init ipu_probe(struct platform_device *pdev)
1672 {
1673         struct resource *mem_ipu, *mem_ic;
1674         int ret;
1675
1676         spin_lock_init(&ipu_data.lock);
1677
1678         mem_ipu = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1679         mem_ic  = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1680         if (!mem_ipu || !mem_ic)
1681                 return -EINVAL;
1682
1683         ipu_data.dev = &pdev->dev;
1684
1685         platform_set_drvdata(pdev, &ipu_data);
1686
1687         ret = platform_get_irq(pdev, 0);
1688         if (ret < 0)
1689                 goto err_noirq;
1690
1691         ipu_data.irq_fn = ret;
1692         ret = platform_get_irq(pdev, 1);
1693         if (ret < 0)
1694                 goto err_noirq;
1695
1696         ipu_data.irq_err = ret;
1697
1698         dev_dbg(&pdev->dev, "fn irq %u, err irq %u\n",
1699                 ipu_data.irq_fn, ipu_data.irq_err);
1700
1701         /* Remap IPU common registers */
1702         ipu_data.reg_ipu = ioremap(mem_ipu->start, resource_size(mem_ipu));
1703         if (!ipu_data.reg_ipu) {
1704                 ret = -ENOMEM;
1705                 goto err_ioremap_ipu;
1706         }
1707
1708         /* Remap Image Converter and Image DMA Controller registers */
1709         ipu_data.reg_ic = ioremap(mem_ic->start, resource_size(mem_ic));
1710         if (!ipu_data.reg_ic) {
1711                 ret = -ENOMEM;
1712                 goto err_ioremap_ic;
1713         }
1714
1715         /* Get IPU clock */
1716         ipu_data.ipu_clk = clk_get(&pdev->dev, NULL);
1717         if (IS_ERR(ipu_data.ipu_clk)) {
1718                 ret = PTR_ERR(ipu_data.ipu_clk);
1719                 goto err_clk_get;
1720         }
1721
1722         /* Make sure IPU HSP clock is running */
1723         clk_prepare_enable(ipu_data.ipu_clk);
1724
1725         /* Disable all interrupts */
1726         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_1);
1727         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_2);
1728         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_3);
1729         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_4);
1730         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_5);
1731
1732         dev_dbg(&pdev->dev, "%s @ 0x%08lx, fn irq %u, err irq %u\n", pdev->name,
1733                 (unsigned long)mem_ipu->start, ipu_data.irq_fn, ipu_data.irq_err);
1734
1735         ret = ipu_irq_attach_irq(&ipu_data, pdev);
1736         if (ret < 0)
1737                 goto err_attach_irq;
1738
1739         /* Initialize DMA engine */
1740         ret = ipu_idmac_init(&ipu_data);
1741         if (ret < 0)
1742                 goto err_idmac_init;
1743
1744         tasklet_setup(&ipu_data.tasklet, ipu_gc_tasklet);
1745
1746         ipu_data.dev = &pdev->dev;
1747
1748         dev_dbg(ipu_data.dev, "IPU initialized\n");
1749
1750         return 0;
1751
1752 err_idmac_init:
1753 err_attach_irq:
1754         ipu_irq_detach_irq(&ipu_data, pdev);
1755         clk_disable_unprepare(ipu_data.ipu_clk);
1756         clk_put(ipu_data.ipu_clk);
1757 err_clk_get:
1758         iounmap(ipu_data.reg_ic);
1759 err_ioremap_ic:
1760         iounmap(ipu_data.reg_ipu);
1761 err_ioremap_ipu:
1762 err_noirq:
1763         dev_err(&pdev->dev, "Failed to probe IPU: %d\n", ret);
1764         return ret;
1765 }
1766
1767 static int ipu_remove(struct platform_device *pdev)
1768 {
1769         struct ipu *ipu = platform_get_drvdata(pdev);
1770
1771         ipu_idmac_exit(ipu);
1772         ipu_irq_detach_irq(ipu, pdev);
1773         clk_disable_unprepare(ipu->ipu_clk);
1774         clk_put(ipu->ipu_clk);
1775         iounmap(ipu->reg_ic);
1776         iounmap(ipu->reg_ipu);
1777         tasklet_kill(&ipu->tasklet);
1778
1779         return 0;
1780 }
1781
1782 /*
1783  * We need two MEM resources - with IPU-common and Image Converter registers,
1784  * including PF_CONF and IDMAC_* registers, and two IRQs - function and error
1785  */
1786 static struct platform_driver ipu_platform_driver = {
1787         .driver = {
1788                 .name   = "ipu-core",
1789         },
1790         .remove         = ipu_remove,
1791 };
1792
1793 static int __init ipu_init(void)
1794 {
1795         return platform_driver_probe(&ipu_platform_driver, ipu_probe);
1796 }
1797 subsys_initcall(ipu_init);
1798
1799 MODULE_DESCRIPTION("IPU core driver");
1800 MODULE_LICENSE("GPL v2");
1801 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
1802 MODULE_ALIAS("platform:ipu-core");