drivers/dma/ipu/ipu_idmac.c

   1 /*
   2  * Copyright (C) 2008
   3  * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
   4  *
   5  * Copyright (C) 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/err.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/delay.h>
  17 #include <linux/list.h>
  18 #include <linux/clk.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/string.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/io.h>
  23
  24 #include <mach/ipu.h>
  25
  26 #include "ipu_intern.h"
  27
  28 #define FS_VF_IN_VALID  0x00000002
  29 #define FS_ENC_IN_VALID 0x00000001
  30
  31 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
  32                                bool wait_for_stop);
  33
  34 /*
  35  * There can be only one, we could allocate it dynamically, but then we'd have
  36  * to add an extra parameter to some functions, and use something as ugly as
  37  *      struct ipu *ipu = to_ipu(to_idmac(ichan->dma_chan.device));
  38  * in the ISR
  39  */
  40 static struct ipu ipu_data;
  41
  42 #define to_ipu(id) container_of(id, struct ipu, idmac)
  43
  44 static u32 __idmac_read_icreg(struct ipu *ipu, unsigned long reg)
  45 {
  46         return __raw_readl(ipu->reg_ic + reg);
  47 }
  48
  49 #define idmac_read_icreg(ipu, reg) __idmac_read_icreg(ipu, reg - IC_CONF)
  50
  51 static void __idmac_write_icreg(struct ipu *ipu, u32 value, unsigned long reg)
  52 {
  53         __raw_writel(value, ipu->reg_ic + reg);
  54 }
  55
  56 #define idmac_write_icreg(ipu, v, reg) __idmac_write_icreg(ipu, v, reg - IC_CONF)
  57
  58 static u32 idmac_read_ipureg(struct ipu *ipu, unsigned long reg)
  59 {
  60         return __raw_readl(ipu->reg_ipu + reg);
  61 }
  62
  63 static void idmac_write_ipureg(struct ipu *ipu, u32 value, unsigned long reg)
  64 {
  65         __raw_writel(value, ipu->reg_ipu + reg);
  66 }
  67
  68 /*****************************************************************************
  69  * IPU / IC common functions
  70  */
  71 static void dump_idmac_reg(struct ipu *ipu)
  72 {
  73         dev_dbg(ipu->dev, "IDMAC_CONF 0x%x, IC_CONF 0x%x, IDMAC_CHA_EN 0x%x, "
  74                 "IDMAC_CHA_PRI 0x%x, IDMAC_CHA_BUSY 0x%x\n",
  75                 idmac_read_icreg(ipu, IDMAC_CONF),
  76                 idmac_read_icreg(ipu, IC_CONF),
  77                 idmac_read_icreg(ipu, IDMAC_CHA_EN),
  78                 idmac_read_icreg(ipu, IDMAC_CHA_PRI),
  79                 idmac_read_icreg(ipu, IDMAC_CHA_BUSY));
  80         dev_dbg(ipu->dev, "BUF0_RDY 0x%x, BUF1_RDY 0x%x, CUR_BUF 0x%x, "
  81                 "DB_MODE 0x%x, TASKS_STAT 0x%x\n",
  82                 idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
  83                 idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
  84                 idmac_read_ipureg(ipu, IPU_CHA_CUR_BUF),
  85                 idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL),
  86                 idmac_read_ipureg(ipu, IPU_TASKS_STAT));
  87 }
  88
  89 static uint32_t bytes_per_pixel(enum pixel_fmt fmt)
  90 {
  91         switch (fmt) {
  92         case IPU_PIX_FMT_GENERIC:       /* generic data */
  93         case IPU_PIX_FMT_RGB332:
  94         case IPU_PIX_FMT_YUV420P:
  95         case IPU_PIX_FMT_YUV422P:
  96         default:
  97                 return 1;
  98         case IPU_PIX_FMT_RGB565:
  99         case IPU_PIX_FMT_YUYV:
 100         case IPU_PIX_FMT_UYVY:
 101                 return 2;
 102         case IPU_PIX_FMT_BGR24:
 103         case IPU_PIX_FMT_RGB24:
 104                 return 3;
 105         case IPU_PIX_FMT_GENERIC_32:    /* generic data */
 106         case IPU_PIX_FMT_BGR32:
 107         case IPU_PIX_FMT_RGB32:
 108         case IPU_PIX_FMT_ABGR32:
 109                 return 4;
 110         }
 111 }
 112
 113 /* Enable direct write to memory by the Camera Sensor Interface */
 114 static void ipu_ic_enable_task(struct ipu *ipu, enum ipu_channel channel)
 115 {
 116         uint32_t ic_conf, mask;
 117
 118         switch (channel) {
 119         case IDMAC_IC_0:
 120                 mask = IC_CONF_PRPENC_EN;
 121                 break;
 122         case IDMAC_IC_7:
 123                 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
 124                 break;
 125         default:
 126                 return;
 127         }
 128         ic_conf = idmac_read_icreg(ipu, IC_CONF) | mask;
 129         idmac_write_icreg(ipu, ic_conf, IC_CONF);
 130 }
 131
 132 /* Called under spin_lock_irqsave(&ipu_data.lock) */
 133 static void ipu_ic_disable_task(struct ipu *ipu, enum ipu_channel channel)
 134 {
 135         uint32_t ic_conf, mask;
 136
 137         switch (channel) {
 138         case IDMAC_IC_0:
 139                 mask = IC_CONF_PRPENC_EN;
 140                 break;
 141         case IDMAC_IC_7:
 142                 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
 143                 break;
 144         default:
 145                 return;
 146         }
 147         ic_conf = idmac_read_icreg(ipu, IC_CONF) & ~mask;
 148         idmac_write_icreg(ipu, ic_conf, IC_CONF);
 149 }
 150
 151 static uint32_t ipu_channel_status(struct ipu *ipu, enum ipu_channel channel)
 152 {
 153         uint32_t stat = TASK_STAT_IDLE;
 154         uint32_t task_stat_reg = idmac_read_ipureg(ipu, IPU_TASKS_STAT);
 155
 156         switch (channel) {
 157         case IDMAC_IC_7:
 158                 stat = (task_stat_reg & TSTAT_CSI2MEM_MASK) >>
 159                         TSTAT_CSI2MEM_OFFSET;
 160                 break;
 161         case IDMAC_IC_0:
 162         case IDMAC_SDC_0:
 163         case IDMAC_SDC_1:
 164         default:
 165                 break;
 166         }
 167         return stat;
 168 }
 169
 170 struct chan_param_mem_planar {
 171         /* Word 0 */
 172         u32     xv:10;
 173         u32     yv:10;
 174         u32     xb:12;
 175
 176         u32     yb:12;
 177         u32     res1:2;
 178         u32     nsb:1;
 179         u32     lnpb:6;
 180         u32     ubo_l:11;
 181
 182         u32     ubo_h:15;
 183         u32     vbo_l:17;
 184
 185         u32     vbo_h:9;
 186         u32     res2:3;
 187         u32     fw:12;
 188         u32     fh_l:8;
 189
 190         u32     fh_h:4;
 191         u32     res3:28;
 192
 193         /* Word 1 */
 194         u32     eba0;
 195
 196         u32     eba1;
 197
 198         u32     bpp:3;
 199         u32     sl:14;
 200         u32     pfs:3;
 201         u32     bam:3;
 202         u32     res4:2;
 203         u32     npb:6;
 204         u32     res5:1;
 205
 206         u32     sat:2;
 207         u32     res6:30;
 208 } __attribute__ ((packed));
 209
 210 struct chan_param_mem_interleaved {
 211         /* Word 0 */
 212         u32     xv:10;
 213         u32     yv:10;
 214         u32     xb:12;
 215
 216         u32     yb:12;
 217         u32     sce:1;
 218         u32     res1:1;
 219         u32     nsb:1;
 220         u32     lnpb:6;
 221         u32     sx:10;
 222         u32     sy_l:1;
 223
 224         u32     sy_h:9;
 225         u32     ns:10;
 226         u32     sm:10;
 227         u32     sdx_l:3;
 228
 229         u32     sdx_h:2;
 230         u32     sdy:5;
 231         u32     sdrx:1;
 232         u32     sdry:1;
 233         u32     sdr1:1;
 234         u32     res2:2;
 235         u32     fw:12;
 236         u32     fh_l:8;
 237
 238         u32     fh_h:4;
 239         u32     res3:28;
 240
 241         /* Word 1 */
 242         u32     eba0;
 243
 244         u32     eba1;
 245
 246         u32     bpp:3;
 247         u32     sl:14;
 248         u32     pfs:3;
 249         u32     bam:3;
 250         u32     res4:2;
 251         u32     npb:6;
 252         u32     res5:1;
 253
 254         u32     sat:2;
 255         u32     scc:1;
 256         u32     ofs0:5;
 257         u32     ofs1:5;
 258         u32     ofs2:5;
 259         u32     ofs3:5;
 260         u32     wid0:3;
 261         u32     wid1:3;
 262         u32     wid2:3;
 263
 264         u32     wid3:3;
 265         u32     dec_sel:1;
 266         u32     res6:28;
 267 } __attribute__ ((packed));
 268
 269 union chan_param_mem {
 270         struct chan_param_mem_planar            pp;
 271         struct chan_param_mem_interleaved       ip;
 272 };
 273
 274 static void ipu_ch_param_set_plane_offset(union chan_param_mem *params,
 275                                           u32 u_offset, u32 v_offset)
 276 {
 277         params->pp.ubo_l = u_offset & 0x7ff;
 278         params->pp.ubo_h = u_offset >> 11;
 279         params->pp.vbo_l = v_offset & 0x1ffff;
 280         params->pp.vbo_h = v_offset >> 17;
 281 }
 282
 283 static void ipu_ch_param_set_size(union chan_param_mem *params,
 284                                   uint32_t pixel_fmt, uint16_t width,
 285                                   uint16_t height, uint16_t stride)
 286 {
 287         u32 u_offset;
 288         u32 v_offset;
 289
 290         params->pp.fw           = width - 1;
 291         params->pp.fh_l         = height - 1;
 292         params->pp.fh_h         = (height - 1) >> 8;
 293         params->pp.sl           = stride - 1;
 294
 295         switch (pixel_fmt) {
 296         case IPU_PIX_FMT_GENERIC:
 297                 /*Represents 8-bit Generic data */
 298                 params->pp.bpp  = 3;
 299                 params->pp.pfs  = 7;
 300                 params->pp.npb  = 31;
 301                 params->pp.sat  = 2;            /* SAT = use 32-bit access */
 302                 break;
 303         case IPU_PIX_FMT_GENERIC_32:
 304                 /*Represents 32-bit Generic data */
 305                 params->pp.bpp  = 0;
 306                 params->pp.pfs  = 7;
 307                 params->pp.npb  = 7;
 308                 params->pp.sat  = 2;            /* SAT = use 32-bit access */
 309                 break;
 310         case IPU_PIX_FMT_RGB565:
 311                 params->ip.bpp  = 2;
 312                 params->ip.pfs  = 4;
 313                 params->ip.npb  = 7;
 314                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 315                 params->ip.ofs0 = 0;            /* Red bit offset */
 316                 params->ip.ofs1 = 5;            /* Green bit offset */
 317                 params->ip.ofs2 = 11;           /* Blue bit offset */
 318                 params->ip.ofs3 = 16;           /* Alpha bit offset */
 319                 params->ip.wid0 = 4;            /* Red bit width - 1 */
 320                 params->ip.wid1 = 5;            /* Green bit width - 1 */
 321                 params->ip.wid2 = 4;            /* Blue bit width - 1 */
 322                 break;
 323         case IPU_PIX_FMT_BGR24:
 324                 params->ip.bpp  = 1;            /* 24 BPP & RGB PFS */
 325                 params->ip.pfs  = 4;
 326                 params->ip.npb  = 7;
 327                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 328                 params->ip.ofs0 = 0;            /* Red bit offset */
 329                 params->ip.ofs1 = 8;            /* Green bit offset */
 330                 params->ip.ofs2 = 16;           /* Blue bit offset */
 331                 params->ip.ofs3 = 24;           /* Alpha bit offset */
 332                 params->ip.wid0 = 7;            /* Red bit width - 1 */
 333                 params->ip.wid1 = 7;            /* Green bit width - 1 */
 334                 params->ip.wid2 = 7;            /* Blue bit width - 1 */
 335                 break;
 336         case IPU_PIX_FMT_RGB24:
 337                 params->ip.bpp  = 1;            /* 24 BPP & RGB PFS */
 338                 params->ip.pfs  = 4;
 339                 params->ip.npb  = 7;
 340                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 341                 params->ip.ofs0 = 16;           /* Red bit offset */
 342                 params->ip.ofs1 = 8;            /* Green bit offset */
 343                 params->ip.ofs2 = 0;            /* Blue bit offset */
 344                 params->ip.ofs3 = 24;           /* Alpha bit offset */
 345                 params->ip.wid0 = 7;            /* Red bit width - 1 */
 346                 params->ip.wid1 = 7;            /* Green bit width - 1 */
 347                 params->ip.wid2 = 7;            /* Blue bit width - 1 */
 348                 break;
 349         case IPU_PIX_FMT_BGRA32:
 350         case IPU_PIX_FMT_BGR32:
 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_ABGR32:
 380                 params->ip.bpp  = 0;
 381                 params->ip.pfs  = 4;
 382                 params->ip.npb  = 7;
 383                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 384                 params->ip.ofs0 = 8;            /* Red bit offset */
 385                 params->ip.ofs1 = 16;           /* Green bit offset */
 386                 params->ip.ofs2 = 24;           /* Blue bit offset */
 387                 params->ip.ofs3 = 0;            /* Alpha bit offset */
 388                 params->ip.wid0 = 7;            /* Red bit width - 1 */
 389                 params->ip.wid1 = 7;            /* Green bit width - 1 */
 390                 params->ip.wid2 = 7;            /* Blue bit width - 1 */
 391                 params->ip.wid3 = 7;            /* Alpha bit width - 1 */
 392                 break;
 393         case IPU_PIX_FMT_UYVY:
 394                 params->ip.bpp  = 2;
 395                 params->ip.pfs  = 6;
 396                 params->ip.npb  = 7;
 397                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 398                 break;
 399         case IPU_PIX_FMT_YUV420P2:
 400         case IPU_PIX_FMT_YUV420P:
 401                 params->ip.bpp  = 3;
 402                 params->ip.pfs  = 3;
 403                 params->ip.npb  = 7;
 404                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 405                 u_offset = stride * height;
 406                 v_offset = u_offset + u_offset / 4;
 407                 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
 408                 break;
 409         case IPU_PIX_FMT_YVU422P:
 410                 params->ip.bpp  = 3;
 411                 params->ip.pfs  = 2;
 412                 params->ip.npb  = 7;
 413                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 414                 v_offset = stride * height;
 415                 u_offset = v_offset + v_offset / 2;
 416                 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
 417                 break;
 418         case IPU_PIX_FMT_YUV422P:
 419                 params->ip.bpp  = 3;
 420                 params->ip.pfs  = 2;
 421                 params->ip.npb  = 7;
 422                 params->ip.sat  = 2;            /* SAT = 32-bit access */
 423                 u_offset = stride * height;
 424                 v_offset = u_offset + u_offset / 2;
 425                 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
 426                 break;
 427         default:
 428                 dev_err(ipu_data.dev,
 429                         "mx3 ipu: unimplemented pixel format %d\n", pixel_fmt);
 430                 break;
 431         }
 432
 433         params->pp.nsb = 1;
 434 }
 435
 436 static void ipu_ch_param_set_burst_size(union chan_param_mem *params,
 437                                         uint16_t burst_pixels)
 438 {
 439         params->pp.npb = burst_pixels - 1;
 440 }
 441
 442 static void ipu_ch_param_set_buffer(union chan_param_mem *params,
 443                                     dma_addr_t buf0, dma_addr_t buf1)
 444 {
 445         params->pp.eba0 = buf0;
 446         params->pp.eba1 = buf1;
 447 }
 448
 449 static void ipu_ch_param_set_rotation(union chan_param_mem *params,
 450                                       enum ipu_rotate_mode rotate)
 451 {
 452         params->pp.bam = rotate;
 453 }
 454
 455 static void ipu_write_param_mem(uint32_t addr, uint32_t *data,
 456                                 uint32_t num_words)
 457 {
 458         for (; num_words > 0; num_words--) {
 459                 dev_dbg(ipu_data.dev,
 460                         "write param mem - addr = 0x%08X, data = 0x%08X\n",
 461                         addr, *data);
 462                 idmac_write_ipureg(&ipu_data, addr, IPU_IMA_ADDR);
 463                 idmac_write_ipureg(&ipu_data, *data++, IPU_IMA_DATA);
 464                 addr++;
 465                 if ((addr & 0x7) == 5) {
 466                         addr &= ~0x7;   /* set to word 0 */
 467                         addr += 8;      /* increment to next row */
 468                 }
 469         }
 470 }
 471
 472 static int calc_resize_coeffs(uint32_t in_size, uint32_t out_size,
 473                               uint32_t *resize_coeff,
 474                               uint32_t *downsize_coeff)
 475 {
 476         uint32_t temp_size;
 477         uint32_t temp_downsize;
 478
 479         *resize_coeff   = 1 << 13;
 480         *downsize_coeff = 1 << 13;
 481
 482         /* Cannot downsize more than 8:1 */
 483         if (out_size << 3 < in_size)
 484                 return -EINVAL;
 485
 486         /* compute downsizing coefficient */
 487         temp_downsize = 0;
 488         temp_size = in_size;
 489         while (temp_size >= out_size * 2 && temp_downsize < 2) {
 490                 temp_size >>= 1;
 491                 temp_downsize++;
 492         }
 493         *downsize_coeff = temp_downsize;
 494
 495         /*
 496          * compute resizing coefficient using the following formula:
 497          * resize_coeff = M*(SI -1)/(SO - 1)
 498          * where M = 2^13, SI - input size, SO - output size
 499          */
 500         *resize_coeff = (8192L * (temp_size - 1)) / (out_size - 1);
 501         if (*resize_coeff >= 16384L) {
 502                 dev_err(ipu_data.dev, "Warning! Overflow on resize coeff.\n");
 503                 *resize_coeff = 0x3FFF;
 504         }
 505
 506         dev_dbg(ipu_data.dev, "resizing from %u -> %u pixels, "
 507                 "downsize=%u, resize=%u.%lu (reg=%u)\n", in_size, out_size,
 508                 *downsize_coeff, *resize_coeff >= 8192L ? 1 : 0,
 509                 ((*resize_coeff & 0x1FFF) * 10000L) / 8192L, *resize_coeff);
 510
 511         return 0;
 512 }
 513
 514 static enum ipu_color_space format_to_colorspace(enum pixel_fmt fmt)
 515 {
 516         switch (fmt) {
 517         case IPU_PIX_FMT_RGB565:
 518         case IPU_PIX_FMT_BGR24:
 519         case IPU_PIX_FMT_RGB24:
 520         case IPU_PIX_FMT_BGR32:
 521         case IPU_PIX_FMT_RGB32:
 522                 return IPU_COLORSPACE_RGB;
 523         default:
 524                 return IPU_COLORSPACE_YCBCR;
 525         }
 526 }
 527
 528 static int ipu_ic_init_prpenc(struct ipu *ipu,
 529                               union ipu_channel_param *params, bool src_is_csi)
 530 {
 531         uint32_t reg, ic_conf;
 532         uint32_t downsize_coeff, resize_coeff;
 533         enum ipu_color_space in_fmt, out_fmt;
 534
 535         /* Setup vertical resizing */
 536         calc_resize_coeffs(params->video.in_height,
 537                             params->video.out_height,
 538                             &resize_coeff, &downsize_coeff);
 539         reg = (downsize_coeff << 30) | (resize_coeff << 16);
 540
 541         /* Setup horizontal resizing */
 542         calc_resize_coeffs(params->video.in_width,
 543                             params->video.out_width,
 544                             &resize_coeff, &downsize_coeff);
 545         reg |= (downsize_coeff << 14) | resize_coeff;
 546
 547         /* Setup color space conversion */
 548         in_fmt = format_to_colorspace(params->video.in_pixel_fmt);
 549         out_fmt = format_to_colorspace(params->video.out_pixel_fmt);
 550
 551         /*
 552          * Colourspace conversion unsupported yet - see _init_csc() in
 553          * Freescale sources
 554          */
 555         if (in_fmt != out_fmt) {
 556                 dev_err(ipu->dev, "Colourspace conversion unsupported!\n");
 557                 return -EOPNOTSUPP;
 558         }
 559
 560         idmac_write_icreg(ipu, reg, IC_PRP_ENC_RSC);
 561
 562         ic_conf = idmac_read_icreg(ipu, IC_CONF);
 563
 564         if (src_is_csi)
 565                 ic_conf &= ~IC_CONF_RWS_EN;
 566         else
 567                 ic_conf |= IC_CONF_RWS_EN;
 568
 569         idmac_write_icreg(ipu, ic_conf, IC_CONF);
 570
 571         return 0;
 572 }
 573
 574 static uint32_t dma_param_addr(uint32_t dma_ch)
 575 {
 576         /* Channel Parameter Memory */
 577         return 0x10000 | (dma_ch << 4);
 578 }
 579
 580 static void ipu_channel_set_priority(struct ipu *ipu, enum ipu_channel channel,
 581                                      bool prio)
 582 {
 583         u32 reg = idmac_read_icreg(ipu, IDMAC_CHA_PRI);
 584
 585         if (prio)
 586                 reg |= 1UL << channel;
 587         else
 588                 reg &= ~(1UL << channel);
 589
 590         idmac_write_icreg(ipu, reg, IDMAC_CHA_PRI);
 591
 592         dump_idmac_reg(ipu);
 593 }
 594
 595 static uint32_t ipu_channel_conf_mask(enum ipu_channel channel)
 596 {
 597         uint32_t mask;
 598
 599         switch (channel) {
 600         case IDMAC_IC_0:
 601         case IDMAC_IC_7:
 602                 mask = IPU_CONF_CSI_EN | IPU_CONF_IC_EN;
 603                 break;
 604         case IDMAC_SDC_0:
 605         case IDMAC_SDC_1:
 606                 mask = IPU_CONF_SDC_EN | IPU_CONF_DI_EN;
 607                 break;
 608         default:
 609                 mask = 0;
 610                 break;
 611         }
 612
 613         return mask;
 614 }
 615
 616 /**
 617  * ipu_enable_channel() - enable an IPU channel.
 618  * @idmac:      IPU DMAC context.
 619  * @ichan:      IDMAC channel.
 620  * @return:     0 on success or negative error code on failure.
 621  */
 622 static int ipu_enable_channel(struct idmac *idmac, struct idmac_channel *ichan)
 623 {
 624         struct ipu *ipu = to_ipu(idmac);
 625         enum ipu_channel channel = ichan->dma_chan.chan_id;
 626         uint32_t reg;
 627         unsigned long flags;
 628
 629         spin_lock_irqsave(&ipu->lock, flags);
 630
 631         /* Reset to buffer 0 */
 632         idmac_write_ipureg(ipu, 1UL << channel, IPU_CHA_CUR_BUF);
 633         ichan->active_buffer = 0;
 634         ichan->status = IPU_CHANNEL_ENABLED;
 635
 636         switch (channel) {
 637         case IDMAC_SDC_0:
 638         case IDMAC_SDC_1:
 639         case IDMAC_IC_7:
 640                 ipu_channel_set_priority(ipu, channel, true);
 641         default:
 642                 break;
 643         }
 644
 645         reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
 646
 647         idmac_write_icreg(ipu, reg | (1UL << channel), IDMAC_CHA_EN);
 648
 649         ipu_ic_enable_task(ipu, channel);
 650
 651         spin_unlock_irqrestore(&ipu->lock, flags);
 652         return 0;
 653 }
 654
 655 /**
 656  * ipu_init_channel_buffer() - initialize a buffer for logical IPU channel.
 657  * @ichan:      IDMAC channel.
 658  * @pixel_fmt:  pixel format of buffer. Pixel format is a FOURCC ASCII code.
 659  * @width:      width of buffer in pixels.
 660  * @height:     height of buffer in pixels.
 661  * @stride:     stride length of buffer in pixels.
 662  * @rot_mode:   rotation mode of buffer. A rotation setting other than
 663  *              IPU_ROTATE_VERT_FLIP should only be used for input buffers of
 664  *              rotation channels.
 665  * @phyaddr_0:  buffer 0 physical address.
 666  * @phyaddr_1:  buffer 1 physical address. Setting this to a value other than
 667  *              NULL enables double buffering mode.
 668  * @return:     0 on success or negative error code on failure.
 669  */
 670 static int ipu_init_channel_buffer(struct idmac_channel *ichan,
 671                                    enum pixel_fmt pixel_fmt,
 672                                    uint16_t width, uint16_t height,
 673                                    uint32_t stride,
 674                                    enum ipu_rotate_mode rot_mode,
 675                                    dma_addr_t phyaddr_0, dma_addr_t phyaddr_1)
 676 {
 677         enum ipu_channel channel = ichan->dma_chan.chan_id;
 678         struct idmac *idmac = to_idmac(ichan->dma_chan.device);
 679         struct ipu *ipu = to_ipu(idmac);
 680         union chan_param_mem params = {};
 681         unsigned long flags;
 682         uint32_t reg;
 683         uint32_t stride_bytes;
 684
 685         stride_bytes = stride * bytes_per_pixel(pixel_fmt);
 686
 687         if (stride_bytes % 4) {
 688                 dev_err(ipu->dev,
 689                         "Stride length must be 32-bit aligned, stride = %d, bytes = %d\n",
 690                         stride, stride_bytes);
 691                 return -EINVAL;
 692         }
 693
 694         /* IC channel's stride must be a multiple of 8 pixels */
 695         if ((channel <= IDMAC_IC_13) && (stride % 8)) {
 696                 dev_err(ipu->dev, "Stride must be 8 pixel multiple\n");
 697                 return -EINVAL;
 698         }
 699
 700         /* Build parameter memory data for DMA channel */
 701         ipu_ch_param_set_size(&params, pixel_fmt, width, height, stride_bytes);
 702         ipu_ch_param_set_buffer(&params, phyaddr_0, phyaddr_1);
 703         ipu_ch_param_set_rotation(&params, rot_mode);
 704         /* Some channels (rotation) have restriction on burst length */
 705         switch (channel) {
 706         case IDMAC_IC_7:        /* Hangs with burst 8, 16, other values
 707                                    invalid - Table 44-30 */
 708 /*
 709                 ipu_ch_param_set_burst_size(&params, 8);
 710  */
 711                 break;
 712         case IDMAC_SDC_0:
 713         case IDMAC_SDC_1:
 714                 /* In original code only IPU_PIX_FMT_RGB565 was setting burst */
 715                 ipu_ch_param_set_burst_size(&params, 16);
 716                 break;
 717         case IDMAC_IC_0:
 718         default:
 719                 break;
 720         }
 721
 722         spin_lock_irqsave(&ipu->lock, flags);
 723
 724         ipu_write_param_mem(dma_param_addr(channel), (uint32_t *)&params, 10);
 725
 726         reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
 727
 728         if (phyaddr_1)
 729                 reg |= 1UL << channel;
 730         else
 731                 reg &= ~(1UL << channel);
 732
 733         idmac_write_ipureg(ipu, reg, IPU_CHA_DB_MODE_SEL);
 734
 735         ichan->status = IPU_CHANNEL_READY;
 736
 737         spin_unlock_irqrestore(&ipu->lock, flags);
 738
 739         return 0;
 740 }
 741
 742 /**
 743  * ipu_select_buffer() - mark a channel's buffer as ready.
 744  * @channel:    channel ID.
 745  * @buffer_n:   buffer number to mark ready.
 746  */
 747 static void ipu_select_buffer(enum ipu_channel channel, int buffer_n)
 748 {
 749         /* No locking - this is a write-one-to-set register, cleared by IPU */
 750         if (buffer_n == 0)
 751                 /* Mark buffer 0 as ready. */
 752                 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF0_RDY);
 753         else
 754                 /* Mark buffer 1 as ready. */
 755                 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF1_RDY);
 756 }
 757
 758 /**
 759  * ipu_update_channel_buffer() - update physical address of a channel buffer.
 760  * @ichan:      IDMAC channel.
 761  * @buffer_n:   buffer number to update.
 762  *              0 or 1 are the only valid values.
 763  * @phyaddr:    buffer physical address.
 764  * @return:     Returns 0 on success or negative error code on failure. This
 765  *              function will fail if the buffer is set to ready.
 766  */
 767 /* Called under spin_lock(_irqsave)(&ichan->lock) */
 768 static int ipu_update_channel_buffer(struct idmac_channel *ichan,
 769                                      int buffer_n, dma_addr_t phyaddr)
 770 {
 771         enum ipu_channel channel = ichan->dma_chan.chan_id;
 772         uint32_t reg;
 773         unsigned long flags;
 774
 775         spin_lock_irqsave(&ipu_data.lock, flags);
 776
 777         if (buffer_n == 0) {
 778                 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
 779                 if (reg & (1UL << channel)) {
 780                         ipu_ic_disable_task(&ipu_data, channel);
 781                         ichan->status = IPU_CHANNEL_READY;
 782                 }
 783
 784                 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 0) */
 785                 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
 786                                    0x0008UL, IPU_IMA_ADDR);
 787                 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
 788         } else {
 789                 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
 790                 if (reg & (1UL << channel)) {
 791                         ipu_ic_disable_task(&ipu_data, channel);
 792                         ichan->status = IPU_CHANNEL_READY;
 793                 }
 794
 795                 /* Check if double-buffering is already enabled */
 796                 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_DB_MODE_SEL);
 797
 798                 if (!(reg & (1UL << channel)))
 799                         idmac_write_ipureg(&ipu_data, reg | (1UL << channel),
 800                                            IPU_CHA_DB_MODE_SEL);
 801
 802                 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 1) */
 803                 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
 804                                    0x0009UL, IPU_IMA_ADDR);
 805                 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
 806         }
 807
 808         spin_unlock_irqrestore(&ipu_data.lock, flags);
 809
 810         return 0;
 811 }
 812
 813 /* Called under spin_lock_irqsave(&ichan->lock) */
 814 static int ipu_submit_buffer(struct idmac_channel *ichan,
 815         struct idmac_tx_desc *desc, struct scatterlist *sg, int buf_idx)
 816 {
 817         unsigned int chan_id = ichan->dma_chan.chan_id;
 818         struct device *dev = &ichan->dma_chan.dev->device;
 819         int ret;
 820
 821         if (async_tx_test_ack(&desc->txd))
 822                 return -EINTR;
 823
 824         /*
 825          * On first invocation this shouldn't be necessary, the call to
 826          * ipu_init_channel_buffer() above will set addresses for us, so we
 827          * could make it conditional on status >= IPU_CHANNEL_ENABLED, but
 828          * doing it again shouldn't hurt either.
 829          */
 830         ret = ipu_update_channel_buffer(ichan, buf_idx,
 831                                         sg_dma_address(sg));
 832
 833         if (ret < 0) {
 834                 dev_err(dev, "Updating sg %p on channel 0x%x buffer %d failed!\n",
 835                         sg, chan_id, buf_idx);
 836                 return ret;
 837         }
 838
 839         ipu_select_buffer(chan_id, buf_idx);
 840         dev_dbg(dev, "Updated sg %p on channel 0x%x buffer %d\n",
 841                 sg, chan_id, buf_idx);
 842
 843         return 0;
 844 }
 845
 846 /* Called under spin_lock_irqsave(&ichan->lock) */
 847 static int ipu_submit_channel_buffers(struct idmac_channel *ichan,
 848                                       struct idmac_tx_desc *desc)
 849 {
 850         struct scatterlist *sg;
 851         int i, ret = 0;
 852
 853         for (i = 0, sg = desc->sg; i < 2 && sg; i++) {
 854                 if (!ichan->sg[i]) {
 855                         ichan->sg[i] = sg;
 856
 857                         ret = ipu_submit_buffer(ichan, desc, sg, i);
 858                         if (ret < 0)
 859                                 return ret;
 860
 861                         sg = sg_next(sg);
 862                 }
 863         }
 864
 865         return ret;
 866 }
 867
 868 static dma_cookie_t idmac_tx_submit(struct dma_async_tx_descriptor *tx)
 869 {
 870         struct idmac_tx_desc *desc = to_tx_desc(tx);
 871         struct idmac_channel *ichan = to_idmac_chan(tx->chan);
 872         struct idmac *idmac = to_idmac(tx->chan->device);
 873         struct ipu *ipu = to_ipu(idmac);
 874         struct device *dev = &ichan->dma_chan.dev->device;
 875         dma_cookie_t cookie;
 876         unsigned long flags;
 877         int ret;
 878
 879         /* Sanity check */
 880         if (!list_empty(&desc->list)) {
 881                 /* The descriptor doesn't belong to client */
 882                 dev_err(dev, "Descriptor %p not prepared!\n", tx);
 883                 return -EBUSY;
 884         }
 885
 886         mutex_lock(&ichan->chan_mutex);
 887
 888         async_tx_clear_ack(tx);
 889
 890         if (ichan->status < IPU_CHANNEL_READY) {
 891                 struct idmac_video_param *video = &ichan->params.video;
 892                 /*
 893                  * Initial buffer assignment - the first two sg-entries from
 894                  * the descriptor will end up in the IDMAC buffers
 895                  */
 896                 dma_addr_t dma_1 = sg_is_last(desc->sg) ? 0 :
 897                         sg_dma_address(&desc->sg[1]);
 898
 899                 WARN_ON(ichan->sg[0] || ichan->sg[1]);
 900
 901                 cookie = ipu_init_channel_buffer(ichan,
 902                                                  video->out_pixel_fmt,
 903                                                  video->out_width,
 904                                                  video->out_height,
 905                                                  video->out_stride,
 906                                                  IPU_ROTATE_NONE,
 907                                                  sg_dma_address(&desc->sg[0]),
 908                                                  dma_1);
 909                 if (cookie < 0)
 910                         goto out;
 911         }
 912
 913         dev_dbg(dev, "Submitting sg %p\n", &desc->sg[0]);
 914
 915         cookie = ichan->dma_chan.cookie;
 916
 917         if (++cookie < 0)
 918                 cookie = 1;
 919
 920         /* from dmaengine.h: "last cookie value returned to client" */
 921         ichan->dma_chan.cookie = cookie;
 922         tx->cookie = cookie;
 923
 924         /* ipu->lock can be taken under ichan->lock, but not v.v. */
 925         spin_lock_irqsave(&ichan->lock, flags);
 926
 927         list_add_tail(&desc->list, &ichan->queue);
 928         /* submit_buffers() atomically verifies and fills empty sg slots */
 929         ret = ipu_submit_channel_buffers(ichan, desc);
 930
 931         spin_unlock_irqrestore(&ichan->lock, flags);
 932
 933         if (ret < 0) {
 934                 cookie = ret;
 935                 goto dequeue;
 936         }
 937
 938         if (ichan->status < IPU_CHANNEL_ENABLED) {
 939                 ret = ipu_enable_channel(idmac, ichan);
 940                 if (ret < 0) {
 941                         cookie = ret;
 942                         goto dequeue;
 943                 }
 944         }
 945
 946         dump_idmac_reg(ipu);
 947
 948 dequeue:
 949         if (cookie < 0) {
 950                 spin_lock_irqsave(&ichan->lock, flags);
 951                 list_del_init(&desc->list);
 952                 spin_unlock_irqrestore(&ichan->lock, flags);
 953                 tx->cookie = cookie;
 954                 ichan->dma_chan.cookie = cookie;
 955         }
 956
 957 out:
 958         mutex_unlock(&ichan->chan_mutex);
 959
 960         return cookie;
 961 }
 962
 963 /* Called with ichan->chan_mutex held */
 964 static int idmac_desc_alloc(struct idmac_channel *ichan, int n)
 965 {
 966         struct idmac_tx_desc *desc = vmalloc(n * sizeof(struct idmac_tx_desc));
 967         struct idmac *idmac = to_idmac(ichan->dma_chan.device);
 968
 969         if (!desc)
 970                 return -ENOMEM;
 971
 972         /* No interrupts, just disable the tasklet for a moment */
 973         tasklet_disable(&to_ipu(idmac)->tasklet);
 974
 975         ichan->n_tx_desc = n;
 976         ichan->desc = desc;
 977         INIT_LIST_HEAD(&ichan->queue);
 978         INIT_LIST_HEAD(&ichan->free_list);
 979
 980         while (n--) {
 981                 struct dma_async_tx_descriptor *txd = &desc->txd;
 982
 983                 memset(txd, 0, sizeof(*txd));
 984                 dma_async_tx_descriptor_init(txd, &ichan->dma_chan);
 985                 txd->tx_submit          = idmac_tx_submit;
 986
 987                 list_add(&desc->list, &ichan->free_list);
 988
 989                 desc++;
 990         }
 991
 992         tasklet_enable(&to_ipu(idmac)->tasklet);
 993
 994         return 0;
 995 }
 996
 997 /**
 998  * ipu_init_channel() - initialize an IPU channel.
 999  * @idmac:      IPU DMAC context.
1000  * @ichan:      pointer to the channel object.
1001  * @return      0 on success or negative error code on failure.
1002  */
1003 static int ipu_init_channel(struct idmac *idmac, struct idmac_channel *ichan)
1004 {
1005         union ipu_channel_param *params = &ichan->params;
1006         uint32_t ipu_conf;
1007         enum ipu_channel channel = ichan->dma_chan.chan_id;
1008         unsigned long flags;
1009         uint32_t reg;
1010         struct ipu *ipu = to_ipu(idmac);
1011         int ret = 0, n_desc = 0;
1012
1013         dev_dbg(ipu->dev, "init channel = %d\n", channel);
1014
1015         if (channel != IDMAC_SDC_0 && channel != IDMAC_SDC_1 &&
1016             channel != IDMAC_IC_7)
1017                 return -EINVAL;
1018
1019         spin_lock_irqsave(&ipu->lock, flags);
1020
1021         switch (channel) {
1022         case IDMAC_IC_7:
1023                 n_desc = 16;
1024                 reg = idmac_read_icreg(ipu, IC_CONF);
1025                 idmac_write_icreg(ipu, reg & ~IC_CONF_CSI_MEM_WR_EN, IC_CONF);
1026                 break;
1027         case IDMAC_IC_0:
1028                 n_desc = 16;
1029                 reg = idmac_read_ipureg(ipu, IPU_FS_PROC_FLOW);
1030                 idmac_write_ipureg(ipu, reg & ~FS_ENC_IN_VALID, IPU_FS_PROC_FLOW);
1031                 ret = ipu_ic_init_prpenc(ipu, params, true);
1032                 break;
1033         case IDMAC_SDC_0:
1034         case IDMAC_SDC_1:
1035                 n_desc = 4;
1036         default:
1037                 break;
1038         }
1039
1040         ipu->channel_init_mask |= 1L << channel;
1041
1042         /* Enable IPU sub module */
1043         ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) |
1044                 ipu_channel_conf_mask(channel);
1045         idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
1046
1047         spin_unlock_irqrestore(&ipu->lock, flags);
1048
1049         if (n_desc && !ichan->desc)
1050                 ret = idmac_desc_alloc(ichan, n_desc);
1051
1052         dump_idmac_reg(ipu);
1053
1054         return ret;
1055 }
1056
1057 /**
1058  * ipu_uninit_channel() - uninitialize an IPU channel.
1059  * @idmac:      IPU DMAC context.
1060  * @ichan:      pointer to the channel object.
1061  */
1062 static void ipu_uninit_channel(struct idmac *idmac, struct idmac_channel *ichan)
1063 {
1064         enum ipu_channel channel = ichan->dma_chan.chan_id;
1065         unsigned long flags;
1066         uint32_t reg;
1067         unsigned long chan_mask = 1UL << channel;
1068         uint32_t ipu_conf;
1069         struct ipu *ipu = to_ipu(idmac);
1070
1071         spin_lock_irqsave(&ipu->lock, flags);
1072
1073         if (!(ipu->channel_init_mask & chan_mask)) {
1074                 dev_err(ipu->dev, "Channel already uninitialized %d\n",
1075                         channel);
1076                 spin_unlock_irqrestore(&ipu->lock, flags);
1077                 return;
1078         }
1079
1080         /* Reset the double buffer */
1081         reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
1082         idmac_write_ipureg(ipu, reg & ~chan_mask, IPU_CHA_DB_MODE_SEL);
1083
1084         ichan->sec_chan_en = false;
1085
1086         switch (channel) {
1087         case IDMAC_IC_7:
1088                 reg = idmac_read_icreg(ipu, IC_CONF);
1089                 idmac_write_icreg(ipu, reg & ~(IC_CONF_RWS_EN | IC_CONF_PRPENC_EN),
1090                              IC_CONF);
1091                 break;
1092         case IDMAC_IC_0:
1093                 reg = idmac_read_icreg(ipu, IC_CONF);
1094                 idmac_write_icreg(ipu, reg & ~(IC_CONF_PRPENC_EN | IC_CONF_PRPENC_CSC1),
1095                                   IC_CONF);
1096                 break;
1097         case IDMAC_SDC_0:
1098         case IDMAC_SDC_1:
1099         default:
1100                 break;
1101         }
1102
1103         ipu->channel_init_mask &= ~(1L << channel);
1104
1105         ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) &
1106                 ~ipu_channel_conf_mask(channel);
1107         idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
1108
1109         spin_unlock_irqrestore(&ipu->lock, flags);
1110
1111         ichan->n_tx_desc = 0;
1112         vfree(ichan->desc);
1113         ichan->desc = NULL;
1114 }
1115
1116 /**
1117  * ipu_disable_channel() - disable an IPU channel.
1118  * @idmac:              IPU DMAC context.
1119  * @ichan:              channel object pointer.
1120  * @wait_for_stop:      flag to set whether to wait for channel end of frame or
1121  *                      return immediately.
1122  * @return:             0 on success or negative error code on failure.
1123  */
1124 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
1125                                bool wait_for_stop)
1126 {
1127         enum ipu_channel channel = ichan->dma_chan.chan_id;
1128         struct ipu *ipu = to_ipu(idmac);
1129         uint32_t reg;
1130         unsigned long flags;
1131         unsigned long chan_mask = 1UL << channel;
1132         unsigned int timeout;
1133
1134         if (wait_for_stop && channel != IDMAC_SDC_1 && channel != IDMAC_SDC_0) {
1135                 timeout = 40;
1136                 /* This waiting always fails. Related to spurious irq problem */
1137                 while ((idmac_read_icreg(ipu, IDMAC_CHA_BUSY) & chan_mask) ||
1138                        (ipu_channel_status(ipu, channel) == TASK_STAT_ACTIVE)) {
1139                         timeout--;
1140                         msleep(10);
1141
1142                         if (!timeout) {
1143                                 dev_dbg(ipu->dev,
1144                                         "Warning: timeout waiting for channel %u to "
1145                                         "stop: buf0_rdy = 0x%08X, buf1_rdy = 0x%08X, "
1146                                         "busy = 0x%08X, tstat = 0x%08X\n", channel,
1147                                         idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
1148                                         idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
1149                                         idmac_read_icreg(ipu, IDMAC_CHA_BUSY),
1150                                         idmac_read_ipureg(ipu, IPU_TASKS_STAT));
1151                                 break;
1152                         }
1153                 }
1154                 dev_dbg(ipu->dev, "timeout = %d * 10ms\n", 40 - timeout);
1155         }
1156         /* SDC BG and FG must be disabled before DMA is disabled */
1157         if (wait_for_stop && (channel == IDMAC_SDC_0 ||
1158                               channel == IDMAC_SDC_1)) {
1159                 for (timeout = 5;
1160                      timeout && !ipu_irq_status(ichan->eof_irq); timeout--)
1161                         msleep(5);
1162         }
1163
1164         spin_lock_irqsave(&ipu->lock, flags);
1165
1166         /* Disable IC task */
1167         ipu_ic_disable_task(ipu, channel);
1168
1169         /* Disable DMA channel(s) */
1170         reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
1171         idmac_write_icreg(ipu, reg & ~chan_mask, IDMAC_CHA_EN);
1172
1173         /*
1174          * Problem (observed with channel DMAIC_7): after enabling the channel
1175          * and initialising buffers, there comes an interrupt with current still
1176          * pointing at buffer 0, whereas it should use buffer 0 first and only
1177          * generate an interrupt when it is done, then current should already
1178          * point to buffer 1. This spurious interrupt also comes on channel
1179          * DMASDC_0. With DMAIC_7 normally, is we just leave the ISR after the
1180          * first interrupt, there comes the second with current correctly
1181          * pointing to buffer 1 this time. But sometimes this second interrupt
1182          * doesn't come and the channel hangs. Clearing BUFx_RDY when disabling
1183          * the channel seems to prevent the channel from hanging, but it doesn't
1184          * prevent the spurious interrupt. This might also be unsafe. Think
1185          * about the IDMAC controller trying to switch to a buffer, when we
1186          * clear the ready bit, and re-enable it a moment later.
1187          */
1188         reg = idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY);
1189         idmac_write_ipureg(ipu, 0, IPU_CHA_BUF0_RDY);
1190         idmac_write_ipureg(ipu, reg & ~(1UL << channel), IPU_CHA_BUF0_RDY);
1191
1192         reg = idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY);
1193         idmac_write_ipureg(ipu, 0, IPU_CHA_BUF1_RDY);
1194         idmac_write_ipureg(ipu, reg & ~(1UL << channel), IPU_CHA_BUF1_RDY);
1195
1196         spin_unlock_irqrestore(&ipu->lock, flags);
1197
1198         return 0;
1199 }
1200
1201 static struct scatterlist *idmac_sg_next(struct idmac_channel *ichan,
1202         struct idmac_tx_desc **desc, struct scatterlist *sg)
1203 {
1204         struct scatterlist *sgnew = sg ? sg_next(sg) : NULL;
1205
1206         if (sgnew)
1207                 /* next sg-element in this list */
1208                 return sgnew;
1209
1210         if ((*desc)->list.next == &ichan->queue)
1211                 /* No more descriptors on the queue */
1212                 return NULL;
1213
1214         /* Fetch next descriptor */
1215         *desc = list_entry((*desc)->list.next, struct idmac_tx_desc, list);
1216         return (*desc)->sg;
1217 }
1218
1219 /*
1220  * We have several possibilities here:
1221  * current BUF          next BUF
1222  *
1223  * not last sg          next not last sg
1224  * not last sg          next last sg
1225  * last sg              first sg from next descriptor
1226  * last sg              NULL
1227  *
1228  * Besides, the descriptor queue might be empty or not. We process all these
1229  * cases carefully.
1230  */
1231 static irqreturn_t idmac_interrupt(int irq, void *dev_id)
1232 {
1233         struct idmac_channel *ichan = dev_id;
1234         struct device *dev = &ichan->dma_chan.dev->device;
1235         unsigned int chan_id = ichan->dma_chan.chan_id;
1236         struct scatterlist **sg, *sgnext, *sgnew = NULL;
1237         /* Next transfer descriptor */
1238         struct idmac_tx_desc *desc, *descnew;
1239         dma_async_tx_callback callback;
1240         void *callback_param;
1241         bool done = false;
1242         u32 ready0, ready1, curbuf, err;
1243         unsigned long flags;
1244
1245         /* IDMAC has cleared the respective BUFx_RDY bit, we manage the buffer */
1246
1247         dev_dbg(dev, "IDMAC irq %d, buf %d\n", irq, ichan->active_buffer);
1248
1249         spin_lock_irqsave(&ipu_data.lock, flags);
1250
1251         ready0  = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
1252         ready1  = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
1253         curbuf  = idmac_read_ipureg(&ipu_data, IPU_CHA_CUR_BUF);
1254         err     = idmac_read_ipureg(&ipu_data, IPU_INT_STAT_4);
1255
1256         if (err & (1 << chan_id)) {
1257                 idmac_write_ipureg(&ipu_data, 1 << chan_id, IPU_INT_STAT_4);
1258                 spin_unlock_irqrestore(&ipu_data.lock, flags);
1259                 /*
1260                  * Doing this
1261                  * ichan->sg[0] = ichan->sg[1] = NULL;
1262                  * you can force channel re-enable on the next tx_submit(), but
1263                  * this is dirty - think about descriptors with multiple
1264                  * sg elements.
1265                  */
1266                 dev_warn(dev, "NFB4EOF on channel %d, ready %x, %x, cur %x\n",
1267                          chan_id, ready0, ready1, curbuf);
1268                 return IRQ_HANDLED;
1269         }
1270         spin_unlock_irqrestore(&ipu_data.lock, flags);
1271
1272         /* Other interrupts do not interfere with this channel */
1273         spin_lock(&ichan->lock);
1274         if (unlikely(chan_id != IDMAC_SDC_0 && chan_id != IDMAC_SDC_1 &&
1275                      ((curbuf >> chan_id) & 1) == ichan->active_buffer)) {
1276                 int i = 100;
1277
1278                 /* This doesn't help. See comment in ipu_disable_channel() */
1279                 while (--i) {
1280                         curbuf = idmac_read_ipureg(&ipu_data, IPU_CHA_CUR_BUF);
1281                         if (((curbuf >> chan_id) & 1) != ichan->active_buffer)
1282                                 break;
1283                         cpu_relax();
1284                 }
1285
1286                 if (!i) {
1287                         spin_unlock(&ichan->lock);
1288                         dev_dbg(dev,
1289                                 "IRQ on active buffer on channel %x, active "
1290                                 "%d, ready %x, %x, current %x!\n", chan_id,
1291                                 ichan->active_buffer, ready0, ready1, curbuf);
1292                         return IRQ_NONE;
1293                 } else
1294                         dev_dbg(dev,
1295                                 "Buffer deactivated on channel %x, active "
1296                                 "%d, ready %x, %x, current %x, rest %d!\n", chan_id,
1297                                 ichan->active_buffer, ready0, ready1, curbuf, i);
1298         }
1299
1300         if (unlikely((ichan->active_buffer && (ready1 >> chan_id) & 1) ||
1301                      (!ichan->active_buffer && (ready0 >> chan_id) & 1)
1302                      )) {
1303                 spin_unlock(&ichan->lock);
1304                 dev_dbg(dev,
1305                         "IRQ with active buffer still ready on channel %x, "
1306                         "active %d, ready %x, %x!\n", chan_id,
1307                         ichan->active_buffer, ready0, ready1);
1308                 return IRQ_NONE;
1309         }
1310
1311         if (unlikely(list_empty(&ichan->queue))) {
1312                 ichan->sg[ichan->active_buffer] = NULL;
1313                 spin_unlock(&ichan->lock);
1314                 dev_err(dev,
1315                         "IRQ without queued buffers on channel %x, active %d, "
1316                         "ready %x, %x!\n", chan_id,
1317                         ichan->active_buffer, ready0, ready1);
1318                 return IRQ_NONE;
1319         }
1320
1321         /*
1322          * active_buffer is a software flag, it shows which buffer we are
1323          * currently expecting back from the hardware, IDMAC should be
1324          * processing the other buffer already
1325          */
1326         sg = &ichan->sg[ichan->active_buffer];
1327         sgnext = ichan->sg[!ichan->active_buffer];
1328
1329         if (!*sg) {
1330                 spin_unlock(&ichan->lock);
1331                 return IRQ_HANDLED;
1332         }
1333
1334         desc = list_entry(ichan->queue.next, struct idmac_tx_desc, list);
1335         descnew = desc;
1336
1337         dev_dbg(dev, "IDMAC irq %d, dma 0x%08x, next dma 0x%08x, current %d, curbuf 0x%08x\n",
1338                 irq, sg_dma_address(*sg), sgnext ? sg_dma_address(sgnext) : 0, ichan->active_buffer, curbuf);
1339
1340         /* Find the descriptor of sgnext */
1341         sgnew = idmac_sg_next(ichan, &descnew, *sg);
1342         if (sgnext != sgnew)
1343                 dev_err(dev, "Submitted buffer %p, next buffer %p\n", sgnext, sgnew);
1344
1345         /*
1346          * if sgnext == NULL sg must be the last element in a scatterlist and
1347          * queue must be empty
1348          */
1349         if (unlikely(!sgnext)) {
1350                 if (!WARN_ON(sg_next(*sg)))
1351                         dev_dbg(dev, "Underrun on channel %x\n", chan_id);
1352                 ichan->sg[!ichan->active_buffer] = sgnew;
1353
1354                 if (unlikely(sgnew)) {
1355                         ipu_submit_buffer(ichan, descnew, sgnew, !ichan->active_buffer);
1356                 } else {
1357                         spin_lock_irqsave(&ipu_data.lock, flags);
1358                         ipu_ic_disable_task(&ipu_data, chan_id);
1359                         spin_unlock_irqrestore(&ipu_data.lock, flags);
1360                         ichan->status = IPU_CHANNEL_READY;
1361                         /* Continue to check for complete descriptor */
1362                 }
1363         }
1364
1365         /* Calculate and submit the next sg element */
1366         sgnew = idmac_sg_next(ichan, &descnew, sgnew);
1367
1368         if (unlikely(!sg_next(*sg)) || !sgnext) {
1369                 /*
1370                  * Last element in scatterlist done, remove from the queue,
1371                  * _init for debugging
1372                  */
1373                 list_del_init(&desc->list);
1374                 done = true;
1375         }
1376
1377         *sg = sgnew;
1378
1379         if (likely(sgnew) &&
1380             ipu_submit_buffer(ichan, descnew, sgnew, ichan->active_buffer) < 0) {
1381                 callback = desc->txd.callback;
1382                 callback_param = desc->txd.callback_param;
1383                 spin_unlock(&ichan->lock);
1384                 callback(callback_param);
1385                 spin_lock(&ichan->lock);
1386         }
1387
1388         /* Flip the active buffer - even if update above failed */
1389         ichan->active_buffer = !ichan->active_buffer;
1390         if (done)
1391                 ichan->completed = desc->txd.cookie;
1392
1393         callback = desc->txd.callback;
1394         callback_param = desc->txd.callback_param;
1395
1396         spin_unlock(&ichan->lock);
1397
1398         if (done && (desc->txd.flags & DMA_PREP_INTERRUPT) && callback)
1399                 callback(callback_param);
1400
1401         return IRQ_HANDLED;
1402 }
1403
1404 static void ipu_gc_tasklet(unsigned long arg)
1405 {
1406         struct ipu *ipu = (struct ipu *)arg;
1407         int i;
1408
1409         for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1410                 struct idmac_channel *ichan = ipu->channel + i;
1411                 struct idmac_tx_desc *desc;
1412                 unsigned long flags;
1413                 struct scatterlist *sg;
1414                 int j, k;
1415
1416                 for (j = 0; j < ichan->n_tx_desc; j++) {
1417                         desc = ichan->desc + j;
1418                         spin_lock_irqsave(&ichan->lock, flags);
1419                         if (async_tx_test_ack(&desc->txd)) {
1420                                 list_move(&desc->list, &ichan->free_list);
1421                                 for_each_sg(desc->sg, sg, desc->sg_len, k) {
1422                                         if (ichan->sg[0] == sg)
1423                                                 ichan->sg[0] = NULL;
1424                                         else if (ichan->sg[1] == sg)
1425                                                 ichan->sg[1] = NULL;
1426                                 }
1427                                 async_tx_clear_ack(&desc->txd);
1428                         }
1429                         spin_unlock_irqrestore(&ichan->lock, flags);
1430                 }
1431         }
1432 }
1433
1434 /* Allocate and initialise a transfer descriptor. */
1435 static struct dma_async_tx_descriptor *idmac_prep_slave_sg(struct dma_chan *chan,
1436                 struct scatterlist *sgl, unsigned int sg_len,
1437                 enum dma_data_direction direction, unsigned long tx_flags)
1438 {
1439         struct idmac_channel *ichan = to_idmac_chan(chan);
1440         struct idmac_tx_desc *desc = NULL;
1441         struct dma_async_tx_descriptor *txd = NULL;
1442         unsigned long flags;
1443
1444         /* We only can handle these three channels so far */
1445         if (chan->chan_id != IDMAC_SDC_0 && chan->chan_id != IDMAC_SDC_1 &&
1446             chan->chan_id != IDMAC_IC_7)
1447                 return NULL;
1448
1449         if (direction != DMA_FROM_DEVICE && direction != DMA_TO_DEVICE) {
1450                 dev_err(chan->device->dev, "Invalid DMA direction %d!\n", direction);
1451                 return NULL;
1452         }
1453
1454         mutex_lock(&ichan->chan_mutex);
1455
1456         spin_lock_irqsave(&ichan->lock, flags);
1457         if (!list_empty(&ichan->free_list)) {
1458                 desc = list_entry(ichan->free_list.next,
1459                                   struct idmac_tx_desc, list);
1460
1461                 list_del_init(&desc->list);
1462
1463                 desc->sg_len    = sg_len;
1464                 desc->sg        = sgl;
1465                 txd             = &desc->txd;
1466                 txd->flags      = tx_flags;
1467         }
1468         spin_unlock_irqrestore(&ichan->lock, flags);
1469
1470         mutex_unlock(&ichan->chan_mutex);
1471
1472         tasklet_schedule(&to_ipu(to_idmac(chan->device))->tasklet);
1473
1474         return txd;
1475 }
1476
1477 /* Re-select the current buffer and re-activate the channel */
1478 static void idmac_issue_pending(struct dma_chan *chan)
1479 {
1480         struct idmac_channel *ichan = to_idmac_chan(chan);
1481         struct idmac *idmac = to_idmac(chan->device);
1482         struct ipu *ipu = to_ipu(idmac);
1483         unsigned long flags;
1484
1485         /* This is not always needed, but doesn't hurt either */
1486         spin_lock_irqsave(&ipu->lock, flags);
1487         ipu_select_buffer(chan->chan_id, ichan->active_buffer);
1488         spin_unlock_irqrestore(&ipu->lock, flags);
1489
1490         /*
1491          * Might need to perform some parts of initialisation from
1492          * ipu_enable_channel(), but not all, we do not want to reset to buffer
1493          * 0, don't need to set priority again either, but re-enabling the task
1494          * and the channel might be a good idea.
1495          */
1496 }
1497
1498 static void __idmac_terminate_all(struct dma_chan *chan)
1499 {
1500         struct idmac_channel *ichan = to_idmac_chan(chan);
1501         struct idmac *idmac = to_idmac(chan->device);
1502         unsigned long flags;
1503         int i;
1504
1505         ipu_disable_channel(idmac, ichan,
1506                             ichan->status >= IPU_CHANNEL_ENABLED);
1507
1508         tasklet_disable(&to_ipu(idmac)->tasklet);
1509
1510         /* ichan->queue is modified in ISR, have to spinlock */
1511         spin_lock_irqsave(&ichan->lock, flags);
1512         list_splice_init(&ichan->queue, &ichan->free_list);
1513
1514         if (ichan->desc)
1515                 for (i = 0; i < ichan->n_tx_desc; i++) {
1516                         struct idmac_tx_desc *desc = ichan->desc + i;
1517                         if (list_empty(&desc->list))
1518                                 /* Descriptor was prepared, but not submitted */
1519                                 list_add(&desc->list, &ichan->free_list);
1520
1521                         async_tx_clear_ack(&desc->txd);
1522                 }
1523
1524         ichan->sg[0] = NULL;
1525         ichan->sg[1] = NULL;
1526         spin_unlock_irqrestore(&ichan->lock, flags);
1527
1528         tasklet_enable(&to_ipu(idmac)->tasklet);
1529
1530         ichan->status = IPU_CHANNEL_INITIALIZED;
1531 }
1532
1533 static void idmac_terminate_all(struct dma_chan *chan)
1534 {
1535         struct idmac_channel *ichan = to_idmac_chan(chan);
1536
1537         mutex_lock(&ichan->chan_mutex);
1538
1539         __idmac_terminate_all(chan);
1540
1541         mutex_unlock(&ichan->chan_mutex);
1542 }
1543
1544 #ifdef DEBUG
1545 static irqreturn_t ic_sof_irq(int irq, void *dev_id)
1546 {
1547         struct idmac_channel *ichan = dev_id;
1548         printk(KERN_DEBUG "Got SOF IRQ %d on Channel %d\n",
1549                irq, ichan->dma_chan.chan_id);
1550         disable_irq(irq);
1551         return IRQ_HANDLED;
1552 }
1553
1554 static irqreturn_t ic_eof_irq(int irq, void *dev_id)
1555 {
1556         struct idmac_channel *ichan = dev_id;
1557         printk(KERN_DEBUG "Got EOF IRQ %d on Channel %d\n",
1558                irq, ichan->dma_chan.chan_id);
1559         disable_irq(irq);
1560         return IRQ_HANDLED;
1561 }
1562
1563 static int ic_sof = -EINVAL, ic_eof = -EINVAL;
1564 #endif
1565
1566 static int idmac_alloc_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         int ret;
1571
1572         /* dmaengine.c now guarantees to only offer free channels */
1573         BUG_ON(chan->client_count > 1);
1574         WARN_ON(ichan->status != IPU_CHANNEL_FREE);
1575
1576         chan->cookie            = 1;
1577         ichan->completed        = -ENXIO;
1578
1579         ret = ipu_irq_map(chan->chan_id);
1580         if (ret < 0)
1581                 goto eimap;
1582
1583         ichan->eof_irq = ret;
1584
1585         /*
1586          * Important to first disable the channel, because maybe someone
1587          * used it before us, e.g., the bootloader
1588          */
1589         ipu_disable_channel(idmac, ichan, true);
1590
1591         ret = ipu_init_channel(idmac, ichan);
1592         if (ret < 0)
1593                 goto eichan;
1594
1595         ret = request_irq(ichan->eof_irq, idmac_interrupt, 0,
1596                           ichan->eof_name, ichan);
1597         if (ret < 0)
1598                 goto erirq;
1599
1600 #ifdef DEBUG
1601         if (chan->chan_id == IDMAC_IC_7) {
1602                 ic_sof = ipu_irq_map(69);
1603                 if (ic_sof > 0)
1604                         request_irq(ic_sof, ic_sof_irq, 0, "IC SOF", ichan);
1605                 ic_eof = ipu_irq_map(70);
1606                 if (ic_eof > 0)
1607                         request_irq(ic_eof, ic_eof_irq, 0, "IC EOF", ichan);
1608         }
1609 #endif
1610
1611         ichan->status = IPU_CHANNEL_INITIALIZED;
1612
1613         dev_dbg(&chan->dev->device, "Found channel 0x%x, irq %d\n",
1614                 chan->chan_id, ichan->eof_irq);
1615
1616         return ret;
1617
1618 erirq:
1619         ipu_uninit_channel(idmac, ichan);
1620 eichan:
1621         ipu_irq_unmap(chan->chan_id);
1622 eimap:
1623         return ret;
1624 }
1625
1626 static void idmac_free_chan_resources(struct dma_chan *chan)
1627 {
1628         struct idmac_channel *ichan = to_idmac_chan(chan);
1629         struct idmac *idmac = to_idmac(chan->device);
1630
1631         mutex_lock(&ichan->chan_mutex);
1632
1633         __idmac_terminate_all(chan);
1634
1635         if (ichan->status > IPU_CHANNEL_FREE) {
1636 #ifdef DEBUG
1637                 if (chan->chan_id == IDMAC_IC_7) {
1638                         if (ic_sof > 0) {
1639                                 free_irq(ic_sof, ichan);
1640                                 ipu_irq_unmap(69);
1641                                 ic_sof = -EINVAL;
1642                         }
1643                         if (ic_eof > 0) {
1644                                 free_irq(ic_eof, ichan);
1645                                 ipu_irq_unmap(70);
1646                                 ic_eof = -EINVAL;
1647                         }
1648                 }
1649 #endif
1650                 free_irq(ichan->eof_irq, ichan);
1651                 ipu_irq_unmap(chan->chan_id);
1652         }
1653
1654         ichan->status = IPU_CHANNEL_FREE;
1655
1656         ipu_uninit_channel(idmac, ichan);
1657
1658         mutex_unlock(&ichan->chan_mutex);
1659
1660         tasklet_schedule(&to_ipu(idmac)->tasklet);
1661 }
1662
1663 static enum dma_status idmac_is_tx_complete(struct dma_chan *chan,
1664                 dma_cookie_t cookie, dma_cookie_t *done, dma_cookie_t *used)
1665 {
1666         struct idmac_channel *ichan = to_idmac_chan(chan);
1667
1668         if (done)
1669                 *done = ichan->completed;
1670         if (used)
1671                 *used = chan->cookie;
1672         if (cookie != chan->cookie)
1673                 return DMA_ERROR;
1674         return DMA_SUCCESS;
1675 }
1676
1677 static int __init ipu_idmac_init(struct ipu *ipu)
1678 {
1679         struct idmac *idmac = &ipu->idmac;
1680         struct dma_device *dma = &idmac->dma;
1681         int i;
1682
1683         dma_cap_set(DMA_SLAVE, dma->cap_mask);
1684         dma_cap_set(DMA_PRIVATE, dma->cap_mask);
1685
1686         /* Compulsory common fields */
1687         dma->dev                                = ipu->dev;
1688         dma->device_alloc_chan_resources        = idmac_alloc_chan_resources;
1689         dma->device_free_chan_resources         = idmac_free_chan_resources;
1690         dma->device_is_tx_complete              = idmac_is_tx_complete;
1691         dma->device_issue_pending               = idmac_issue_pending;
1692
1693         /* Compulsory for DMA_SLAVE fields */
1694         dma->device_prep_slave_sg               = idmac_prep_slave_sg;
1695         dma->device_terminate_all               = idmac_terminate_all;
1696
1697         INIT_LIST_HEAD(&dma->channels);
1698         for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1699                 struct idmac_channel *ichan = ipu->channel + i;
1700                 struct dma_chan *dma_chan = &ichan->dma_chan;
1701
1702                 spin_lock_init(&ichan->lock);
1703                 mutex_init(&ichan->chan_mutex);
1704
1705                 ichan->status           = IPU_CHANNEL_FREE;
1706                 ichan->sec_chan_en      = false;
1707                 ichan->completed        = -ENXIO;
1708                 snprintf(ichan->eof_name, sizeof(ichan->eof_name), "IDMAC EOF %d", i);
1709
1710                 dma_chan->device        = &idmac->dma;
1711                 dma_chan->cookie        = 1;
1712                 dma_chan->chan_id       = i;
1713                 list_add_tail(&dma_chan->device_node, &dma->channels);
1714         }
1715
1716         idmac_write_icreg(ipu, 0x00000070, IDMAC_CONF);
1717
1718         return dma_async_device_register(&idmac->dma);
1719 }
1720
1721 static void __exit ipu_idmac_exit(struct ipu *ipu)
1722 {
1723         int i;
1724         struct idmac *idmac = &ipu->idmac;
1725
1726         for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1727                 struct idmac_channel *ichan = ipu->channel + i;
1728
1729                 idmac_terminate_all(&ichan->dma_chan);
1730                 idmac_prep_slave_sg(&ichan->dma_chan, NULL, 0, DMA_NONE, 0);
1731         }
1732
1733         dma_async_device_unregister(&idmac->dma);
1734 }
1735
1736 /*****************************************************************************
1737  * IPU common probe / remove
1738  */
1739
1740 static int __init ipu_probe(struct platform_device *pdev)
1741 {
1742         struct ipu_platform_data *pdata = pdev->dev.platform_data;
1743         struct resource *mem_ipu, *mem_ic;
1744         int ret;
1745
1746         spin_lock_init(&ipu_data.lock);
1747
1748         mem_ipu = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1749         mem_ic  = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1750         if (!pdata || !mem_ipu || !mem_ic)
1751                 return -EINVAL;
1752
1753         ipu_data.dev = &pdev->dev;
1754
1755         platform_set_drvdata(pdev, &ipu_data);
1756
1757         ret = platform_get_irq(pdev, 0);
1758         if (ret < 0)
1759                 goto err_noirq;
1760
1761         ipu_data.irq_fn = ret;
1762         ret = platform_get_irq(pdev, 1);
1763         if (ret < 0)
1764                 goto err_noirq;
1765
1766         ipu_data.irq_err = ret;
1767         ipu_data.irq_base = pdata->irq_base;
1768
1769         dev_dbg(&pdev->dev, "fn irq %u, err irq %u, irq-base %u\n",
1770                 ipu_data.irq_fn, ipu_data.irq_err, ipu_data.irq_base);
1771
1772         /* Remap IPU common registers */
1773         ipu_data.reg_ipu = ioremap(mem_ipu->start,
1774                                    mem_ipu->end - mem_ipu->start + 1);
1775         if (!ipu_data.reg_ipu) {
1776                 ret = -ENOMEM;
1777                 goto err_ioremap_ipu;
1778         }
1779
1780         /* Remap Image Converter and Image DMA Controller registers */
1781         ipu_data.reg_ic = ioremap(mem_ic->start,
1782                                   mem_ic->end - mem_ic->start + 1);
1783         if (!ipu_data.reg_ic) {
1784                 ret = -ENOMEM;
1785                 goto err_ioremap_ic;
1786         }
1787
1788         /* Get IPU clock */
1789         ipu_data.ipu_clk = clk_get(&pdev->dev, NULL);
1790         if (IS_ERR(ipu_data.ipu_clk)) {
1791                 ret = PTR_ERR(ipu_data.ipu_clk);
1792                 goto err_clk_get;
1793         }
1794
1795         /* Make sure IPU HSP clock is running */
1796         clk_enable(ipu_data.ipu_clk);
1797
1798         /* Disable all interrupts */
1799         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_1);
1800         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_2);
1801         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_3);
1802         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_4);
1803         idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_5);
1804
1805         dev_dbg(&pdev->dev, "%s @ 0x%08lx, fn irq %u, err irq %u\n", pdev->name,
1806                 (unsigned long)mem_ipu->start, ipu_data.irq_fn, ipu_data.irq_err);
1807
1808         ret = ipu_irq_attach_irq(&ipu_data, pdev);
1809         if (ret < 0)
1810                 goto err_attach_irq;
1811
1812         /* Initialize DMA engine */
1813         ret = ipu_idmac_init(&ipu_data);
1814         if (ret < 0)
1815                 goto err_idmac_init;
1816
1817         tasklet_init(&ipu_data.tasklet, ipu_gc_tasklet, (unsigned long)&ipu_data);
1818
1819         ipu_data.dev = &pdev->dev;
1820
1821         dev_dbg(ipu_data.dev, "IPU initialized\n");
1822
1823         return 0;
1824
1825 err_idmac_init:
1826 err_attach_irq:
1827         ipu_irq_detach_irq(&ipu_data, pdev);
1828         clk_disable(ipu_data.ipu_clk);
1829         clk_put(ipu_data.ipu_clk);
1830 err_clk_get:
1831         iounmap(ipu_data.reg_ic);
1832 err_ioremap_ic:
1833         iounmap(ipu_data.reg_ipu);
1834 err_ioremap_ipu:
1835 err_noirq:
1836         dev_err(&pdev->dev, "Failed to probe IPU: %d\n", ret);
1837         return ret;
1838 }
1839
1840 static int __exit ipu_remove(struct platform_device *pdev)
1841 {
1842         struct ipu *ipu = platform_get_drvdata(pdev);
1843
1844         ipu_idmac_exit(ipu);
1845         ipu_irq_detach_irq(ipu, pdev);
1846         clk_disable(ipu->ipu_clk);
1847         clk_put(ipu->ipu_clk);
1848         iounmap(ipu->reg_ic);
1849         iounmap(ipu->reg_ipu);
1850         tasklet_kill(&ipu->tasklet);
1851         platform_set_drvdata(pdev, NULL);
1852
1853         return 0;
1854 }
1855
1856 /*
1857  * We need two MEM resources - with IPU-common and Image Converter registers,
1858  * including PF_CONF and IDMAC_* registers, and two IRQs - function and error
1859  */
1860 static struct platform_driver ipu_platform_driver = {
1861         .driver = {
1862                 .name   = "ipu-core",
1863                 .owner  = THIS_MODULE,
1864         },
1865         .remove         = __exit_p(ipu_remove),
1866 };
1867
1868 static int __init ipu_init(void)
1869 {
1870         return platform_driver_probe(&ipu_platform_driver, ipu_probe);
1871 }
1872 subsys_initcall(ipu_init);
1873
1874 MODULE_DESCRIPTION("IPU core driver");
1875 MODULE_LICENSE("GPL v2");
1876 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
1877 MODULE_ALIAS("platform:ipu-core");