drivers/gpu/drm/arm/malidp_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
   4  * Author: Liviu Dudau <Liviu.Dudau@arm.com>
   5  *
   6  * ARM Mali DP500/DP550/DP650 KMS/DRM driver
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/clk.h>
  11 #include <linux/component.h>
  12 #include <linux/of_device.h>
  13 #include <linux/of_graph.h>
  14 #include <linux/of_reserved_mem.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/debugfs.h>
  17
  18 #include <drm/drm_atomic.h>
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_crtc.h>
  21 #include <drm/drm_drv.h>
  22 #include <drm/drm_fb_cma_helper.h>
  23 #include <drm/drm_fb_helper.h>
  24 #include <drm/drm_fourcc.h>
  25 #include <drm/drm_gem_cma_helper.h>
  26 #include <drm/drm_gem_framebuffer_helper.h>
  27 #include <drm/drm_modeset_helper.h>
  28 #include <drm/drm_of.h>
  29 #include <drm/drm_probe_helper.h>
  30 #include <drm/drm_vblank.h>
  31
  32 #include "malidp_drv.h"
  33 #include "malidp_mw.h"
  34 #include "malidp_regs.h"
  35 #include "malidp_hw.h"
  36
  37 #define MALIDP_CONF_VALID_TIMEOUT       250
  38 #define AFBC_HEADER_SIZE                16
  39 #define AFBC_SUPERBLK_ALIGNMENT         128
  40
  41 static void malidp_write_gamma_table(struct malidp_hw_device *hwdev,
  42                                      u32 data[MALIDP_COEFFTAB_NUM_COEFFS])
  43 {
  44         int i;
  45         /* Update all channels with a single gamma curve. */
  46         const u32 gamma_write_mask = GENMASK(18, 16);
  47         /*
  48          * Always write an entire table, so the address field in
  49          * DE_COEFFTAB_ADDR is 0 and we can use the gamma_write_mask bitmask
  50          * directly.
  51          */
  52         malidp_hw_write(hwdev, gamma_write_mask,
  53                         hwdev->hw->map.coeffs_base + MALIDP_COEF_TABLE_ADDR);
  54         for (i = 0; i < MALIDP_COEFFTAB_NUM_COEFFS; ++i)
  55                 malidp_hw_write(hwdev, data[i],
  56                                 hwdev->hw->map.coeffs_base +
  57                                 MALIDP_COEF_TABLE_DATA);
  58 }
  59
  60 static void malidp_atomic_commit_update_gamma(struct drm_crtc *crtc,
  61                                               struct drm_crtc_state *old_state)
  62 {
  63         struct malidp_drm *malidp = crtc_to_malidp_device(crtc);
  64         struct malidp_hw_device *hwdev = malidp->dev;
  65
  66         if (!crtc->state->color_mgmt_changed)
  67                 return;
  68
  69         if (!crtc->state->gamma_lut) {
  70                 malidp_hw_clearbits(hwdev,
  71                                     MALIDP_DISP_FUNC_GAMMA,
  72                                     MALIDP_DE_DISPLAY_FUNC);
  73         } else {
  74                 struct malidp_crtc_state *mc =
  75                         to_malidp_crtc_state(crtc->state);
  76
  77                 if (!old_state->gamma_lut || (crtc->state->gamma_lut->base.id !=
  78                                               old_state->gamma_lut->base.id))
  79                         malidp_write_gamma_table(hwdev, mc->gamma_coeffs);
  80
  81                 malidp_hw_setbits(hwdev, MALIDP_DISP_FUNC_GAMMA,
  82                                   MALIDP_DE_DISPLAY_FUNC);
  83         }
  84 }
  85
  86 static
  87 void malidp_atomic_commit_update_coloradj(struct drm_crtc *crtc,
  88                                           struct drm_crtc_state *old_state)
  89 {
  90         struct malidp_drm *malidp = crtc_to_malidp_device(crtc);
  91         struct malidp_hw_device *hwdev = malidp->dev;
  92         int i;
  93
  94         if (!crtc->state->color_mgmt_changed)
  95                 return;
  96
  97         if (!crtc->state->ctm) {
  98                 malidp_hw_clearbits(hwdev, MALIDP_DISP_FUNC_CADJ,
  99                                     MALIDP_DE_DISPLAY_FUNC);
 100         } else {
 101                 struct malidp_crtc_state *mc =
 102                         to_malidp_crtc_state(crtc->state);
 103
 104                 if (!old_state->ctm || (crtc->state->ctm->base.id !=
 105                                         old_state->ctm->base.id))
 106                         for (i = 0; i < MALIDP_COLORADJ_NUM_COEFFS; ++i)
 107                                 malidp_hw_write(hwdev,
 108                                                 mc->coloradj_coeffs[i],
 109                                                 hwdev->hw->map.coeffs_base +
 110                                                 MALIDP_COLOR_ADJ_COEF + 4 * i);
 111
 112                 malidp_hw_setbits(hwdev, MALIDP_DISP_FUNC_CADJ,
 113                                   MALIDP_DE_DISPLAY_FUNC);
 114         }
 115 }
 116
 117 static void malidp_atomic_commit_se_config(struct drm_crtc *crtc,
 118                                            struct drm_crtc_state *old_state)
 119 {
 120         struct malidp_crtc_state *cs = to_malidp_crtc_state(crtc->state);
 121         struct malidp_crtc_state *old_cs = to_malidp_crtc_state(old_state);
 122         struct malidp_drm *malidp = crtc_to_malidp_device(crtc);
 123         struct malidp_hw_device *hwdev = malidp->dev;
 124         struct malidp_se_config *s = &cs->scaler_config;
 125         struct malidp_se_config *old_s = &old_cs->scaler_config;
 126         u32 se_control = hwdev->hw->map.se_base +
 127                          ((hwdev->hw->map.features & MALIDP_REGMAP_HAS_CLEARIRQ) ?
 128                          0x10 : 0xC);
 129         u32 layer_control = se_control + MALIDP_SE_LAYER_CONTROL;
 130         u32 scr = se_control + MALIDP_SE_SCALING_CONTROL;
 131         u32 val;
 132
 133         /* Set SE_CONTROL */
 134         if (!s->scale_enable) {
 135                 val = malidp_hw_read(hwdev, se_control);
 136                 val &= ~MALIDP_SE_SCALING_EN;
 137                 malidp_hw_write(hwdev, val, se_control);
 138                 return;
 139         }
 140
 141         hwdev->hw->se_set_scaling_coeffs(hwdev, s, old_s);
 142         val = malidp_hw_read(hwdev, se_control);
 143         val |= MALIDP_SE_SCALING_EN | MALIDP_SE_ALPHA_EN;
 144
 145         val &= ~MALIDP_SE_ENH(MALIDP_SE_ENH_MASK);
 146         val |= s->enhancer_enable ? MALIDP_SE_ENH(3) : 0;
 147
 148         val |= MALIDP_SE_RGBO_IF_EN;
 149         malidp_hw_write(hwdev, val, se_control);
 150
 151         /* Set IN_SIZE & OUT_SIZE. */
 152         val = MALIDP_SE_SET_V_SIZE(s->input_h) |
 153               MALIDP_SE_SET_H_SIZE(s->input_w);
 154         malidp_hw_write(hwdev, val, layer_control + MALIDP_SE_L0_IN_SIZE);
 155         val = MALIDP_SE_SET_V_SIZE(s->output_h) |
 156               MALIDP_SE_SET_H_SIZE(s->output_w);
 157         malidp_hw_write(hwdev, val, layer_control + MALIDP_SE_L0_OUT_SIZE);
 158
 159         /* Set phase regs. */
 160         malidp_hw_write(hwdev, s->h_init_phase, scr + MALIDP_SE_H_INIT_PH);
 161         malidp_hw_write(hwdev, s->h_delta_phase, scr + MALIDP_SE_H_DELTA_PH);
 162         malidp_hw_write(hwdev, s->v_init_phase, scr + MALIDP_SE_V_INIT_PH);
 163         malidp_hw_write(hwdev, s->v_delta_phase, scr + MALIDP_SE_V_DELTA_PH);
 164 }
 165
 166 /*
 167  * set the "config valid" bit and wait until the hardware acts on it
 168  */
 169 static int malidp_set_and_wait_config_valid(struct drm_device *drm)
 170 {
 171         struct malidp_drm *malidp = drm->dev_private;
 172         struct malidp_hw_device *hwdev = malidp->dev;
 173         int ret;
 174
 175         hwdev->hw->set_config_valid(hwdev, 1);
 176         /* don't wait for config_valid flag if we are in config mode */
 177         if (hwdev->hw->in_config_mode(hwdev)) {
 178                 atomic_set(&malidp->config_valid, MALIDP_CONFIG_VALID_DONE);
 179                 return 0;
 180         }
 181
 182         ret = wait_event_interruptible_timeout(malidp->wq,
 183                         atomic_read(&malidp->config_valid) == MALIDP_CONFIG_VALID_DONE,
 184                         msecs_to_jiffies(MALIDP_CONF_VALID_TIMEOUT));
 185
 186         return (ret > 0) ? 0 : -ETIMEDOUT;
 187 }
 188
 189 static void malidp_atomic_commit_hw_done(struct drm_atomic_state *state)
 190 {
 191         struct drm_device *drm = state->dev;
 192         struct malidp_drm *malidp = drm->dev_private;
 193         int loop = 5;
 194
 195         malidp->event = malidp->crtc.state->event;
 196         malidp->crtc.state->event = NULL;
 197
 198         if (malidp->crtc.state->active) {
 199                 /*
 200                  * if we have an event to deliver to userspace, make sure
 201                  * the vblank is enabled as we are sending it from the IRQ
 202                  * handler.
 203                  */
 204                 if (malidp->event)
 205                         drm_crtc_vblank_get(&malidp->crtc);
 206
 207                 /* only set config_valid if the CRTC is enabled */
 208                 if (malidp_set_and_wait_config_valid(drm) < 0) {
 209                         /*
 210                          * make a loop around the second CVAL setting and
 211                          * try 5 times before giving up.
 212                          */
 213                         while (loop--) {
 214                                 if (!malidp_set_and_wait_config_valid(drm))
 215                                         break;
 216                         }
 217                         DRM_DEBUG_DRIVER("timed out waiting for updated configuration\n");
 218                 }
 219
 220         } else if (malidp->event) {
 221                 /* CRTC inactive means vblank IRQ is disabled, send event directly */
 222                 spin_lock_irq(&drm->event_lock);
 223                 drm_crtc_send_vblank_event(&malidp->crtc, malidp->event);
 224                 malidp->event = NULL;
 225                 spin_unlock_irq(&drm->event_lock);
 226         }
 227         drm_atomic_helper_commit_hw_done(state);
 228 }
 229
 230 static void malidp_atomic_commit_tail(struct drm_atomic_state *state)
 231 {
 232         struct drm_device *drm = state->dev;
 233         struct malidp_drm *malidp = drm->dev_private;
 234         struct drm_crtc *crtc;
 235         struct drm_crtc_state *old_crtc_state;
 236         int i;
 237         bool fence_cookie = dma_fence_begin_signalling();
 238
 239         pm_runtime_get_sync(drm->dev);
 240
 241         /*
 242          * set config_valid to a special value to let IRQ handlers
 243          * know that we are updating registers
 244          */
 245         atomic_set(&malidp->config_valid, MALIDP_CONFIG_START);
 246         malidp->dev->hw->set_config_valid(malidp->dev, 0);
 247
 248         drm_atomic_helper_commit_modeset_disables(drm, state);
 249
 250         for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
 251                 malidp_atomic_commit_update_gamma(crtc, old_crtc_state);
 252                 malidp_atomic_commit_update_coloradj(crtc, old_crtc_state);
 253                 malidp_atomic_commit_se_config(crtc, old_crtc_state);
 254         }
 255
 256         drm_atomic_helper_commit_planes(drm, state, DRM_PLANE_COMMIT_ACTIVE_ONLY);
 257
 258         malidp_mw_atomic_commit(drm, state);
 259
 260         drm_atomic_helper_commit_modeset_enables(drm, state);
 261
 262         malidp_atomic_commit_hw_done(state);
 263
 264         dma_fence_end_signalling(fence_cookie);
 265
 266         pm_runtime_put(drm->dev);
 267
 268         drm_atomic_helper_cleanup_planes(drm, state);
 269 }
 270
 271 static const struct drm_mode_config_helper_funcs malidp_mode_config_helpers = {
 272         .atomic_commit_tail = malidp_atomic_commit_tail,
 273 };
 274
 275 static bool
 276 malidp_verify_afbc_framebuffer_caps(struct drm_device *dev,
 277                                     const struct drm_mode_fb_cmd2 *mode_cmd)
 278 {
 279         if (malidp_format_mod_supported(dev, mode_cmd->pixel_format,
 280                                         mode_cmd->modifier[0]) == false)
 281                 return false;
 282
 283         if (mode_cmd->offsets[0] != 0) {
 284                 DRM_DEBUG_KMS("AFBC buffers' plane offset should be 0\n");
 285                 return false;
 286         }
 287
 288         switch (mode_cmd->modifier[0] & AFBC_SIZE_MASK) {
 289         case AFBC_SIZE_16X16:
 290                 if ((mode_cmd->width % 16) || (mode_cmd->height % 16)) {
 291                         DRM_DEBUG_KMS("AFBC buffers must be aligned to 16 pixels\n");
 292                         return false;
 293                 }
 294                 break;
 295         default:
 296                 DRM_DEBUG_KMS("Unsupported AFBC block size\n");
 297                 return false;
 298         }
 299
 300         return true;
 301 }
 302
 303 static bool
 304 malidp_verify_afbc_framebuffer_size(struct drm_device *dev,
 305                                     struct drm_file *file,
 306                                     const struct drm_mode_fb_cmd2 *mode_cmd)
 307 {
 308         int n_superblocks = 0;
 309         const struct drm_format_info *info;
 310         struct drm_gem_object *objs = NULL;
 311         u32 afbc_superblock_size = 0, afbc_superblock_height = 0;
 312         u32 afbc_superblock_width = 0, afbc_size = 0;
 313         int bpp = 0;
 314
 315         switch (mode_cmd->modifier[0] & AFBC_SIZE_MASK) {
 316         case AFBC_SIZE_16X16:
 317                 afbc_superblock_height = 16;
 318                 afbc_superblock_width = 16;
 319                 break;
 320         default:
 321                 DRM_DEBUG_KMS("AFBC superblock size is not supported\n");
 322                 return false;
 323         }
 324
 325         info = drm_get_format_info(dev, mode_cmd);
 326
 327         n_superblocks = (mode_cmd->width / afbc_superblock_width) *
 328                 (mode_cmd->height / afbc_superblock_height);
 329
 330         bpp = malidp_format_get_bpp(info->format);
 331
 332         afbc_superblock_size = (bpp * afbc_superblock_width * afbc_superblock_height)
 333                                 / BITS_PER_BYTE;
 334
 335         afbc_size = ALIGN(n_superblocks * AFBC_HEADER_SIZE, AFBC_SUPERBLK_ALIGNMENT);
 336         afbc_size += n_superblocks * ALIGN(afbc_superblock_size, AFBC_SUPERBLK_ALIGNMENT);
 337
 338         if ((mode_cmd->width * bpp) != (mode_cmd->pitches[0] * BITS_PER_BYTE)) {
 339                 DRM_DEBUG_KMS("Invalid value of (pitch * BITS_PER_BYTE) (=%u) "
 340                               "should be same as width (=%u) * bpp (=%u)\n",
 341                               (mode_cmd->pitches[0] * BITS_PER_BYTE),
 342                               mode_cmd->width, bpp);
 343                 return false;
 344         }
 345
 346         objs = drm_gem_object_lookup(file, mode_cmd->handles[0]);
 347         if (!objs) {
 348                 DRM_DEBUG_KMS("Failed to lookup GEM object\n");
 349                 return false;
 350         }
 351
 352         if (objs->size < afbc_size) {
 353                 DRM_DEBUG_KMS("buffer size (%zu) too small for AFBC buffer size = %u\n",
 354                               objs->size, afbc_size);
 355                 drm_gem_object_put(objs);
 356                 return false;
 357         }
 358
 359         drm_gem_object_put(objs);
 360
 361         return true;
 362 }
 363
 364 static bool
 365 malidp_verify_afbc_framebuffer(struct drm_device *dev, struct drm_file *file,
 366                                const struct drm_mode_fb_cmd2 *mode_cmd)
 367 {
 368         if (malidp_verify_afbc_framebuffer_caps(dev, mode_cmd))
 369                 return malidp_verify_afbc_framebuffer_size(dev, file, mode_cmd);
 370
 371         return false;
 372 }
 373
 374 static struct drm_framebuffer *
 375 malidp_fb_create(struct drm_device *dev, struct drm_file *file,
 376                  const struct drm_mode_fb_cmd2 *mode_cmd)
 377 {
 378         if (mode_cmd->modifier[0]) {
 379                 if (!malidp_verify_afbc_framebuffer(dev, file, mode_cmd))
 380                         return ERR_PTR(-EINVAL);
 381         }
 382
 383         return drm_gem_fb_create(dev, file, mode_cmd);
 384 }
 385
 386 static const struct drm_mode_config_funcs malidp_mode_config_funcs = {
 387         .fb_create = malidp_fb_create,
 388         .atomic_check = drm_atomic_helper_check,
 389         .atomic_commit = drm_atomic_helper_commit,
 390 };
 391
 392 static int malidp_init(struct drm_device *drm)
 393 {
 394         int ret;
 395         struct malidp_drm *malidp = drm->dev_private;
 396         struct malidp_hw_device *hwdev = malidp->dev;
 397
 398         drm_mode_config_init(drm);
 399
 400         drm->mode_config.min_width = hwdev->min_line_size;
 401         drm->mode_config.min_height = hwdev->min_line_size;
 402         drm->mode_config.max_width = hwdev->max_line_size;
 403         drm->mode_config.max_height = hwdev->max_line_size;
 404         drm->mode_config.funcs = &malidp_mode_config_funcs;
 405         drm->mode_config.helper_private = &malidp_mode_config_helpers;
 406
 407         ret = malidp_crtc_init(drm);
 408         if (ret)
 409                 goto crtc_fail;
 410
 411         ret = malidp_mw_connector_init(drm);
 412         if (ret)
 413                 goto crtc_fail;
 414
 415         return 0;
 416
 417 crtc_fail:
 418         drm_mode_config_cleanup(drm);
 419         return ret;
 420 }
 421
 422 static void malidp_fini(struct drm_device *drm)
 423 {
 424         drm_mode_config_cleanup(drm);
 425 }
 426
 427 static int malidp_irq_init(struct platform_device *pdev)
 428 {
 429         int irq_de, irq_se, ret = 0;
 430         struct drm_device *drm = dev_get_drvdata(&pdev->dev);
 431         struct malidp_drm *malidp = drm->dev_private;
 432         struct malidp_hw_device *hwdev = malidp->dev;
 433
 434         /* fetch the interrupts from DT */
 435         irq_de = platform_get_irq_byname(pdev, "DE");
 436         if (irq_de < 0) {
 437                 DRM_ERROR("no 'DE' IRQ specified!\n");
 438                 return irq_de;
 439         }
 440         irq_se = platform_get_irq_byname(pdev, "SE");
 441         if (irq_se < 0) {
 442                 DRM_ERROR("no 'SE' IRQ specified!\n");
 443                 return irq_se;
 444         }
 445
 446         ret = malidp_de_irq_init(drm, irq_de);
 447         if (ret)
 448                 return ret;
 449
 450         ret = malidp_se_irq_init(drm, irq_se);
 451         if (ret) {
 452                 malidp_de_irq_fini(hwdev);
 453                 return ret;
 454         }
 455
 456         return 0;
 457 }
 458
 459 DEFINE_DRM_GEM_CMA_FOPS(fops);
 460
 461 static int malidp_dumb_create(struct drm_file *file_priv,
 462                               struct drm_device *drm,
 463                               struct drm_mode_create_dumb *args)
 464 {
 465         struct malidp_drm *malidp = drm->dev_private;
 466         /* allocate for the worst case scenario, i.e. rotated buffers */
 467         u8 alignment = malidp_hw_get_pitch_align(malidp->dev, 1);
 468
 469         args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), alignment);
 470
 471         return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
 472 }
 473
 474 #ifdef CONFIG_DEBUG_FS
 475
 476 static void malidp_error_stats_init(struct malidp_error_stats *error_stats)
 477 {
 478         error_stats->num_errors = 0;
 479         error_stats->last_error_status = 0;
 480         error_stats->last_error_vblank = -1;
 481 }
 482
 483 void malidp_error(struct malidp_drm *malidp,
 484                   struct malidp_error_stats *error_stats, u32 status,
 485                   u64 vblank)
 486 {
 487         unsigned long irqflags;
 488
 489         spin_lock_irqsave(&malidp->errors_lock, irqflags);
 490         error_stats->last_error_status = status;
 491         error_stats->last_error_vblank = vblank;
 492         error_stats->num_errors++;
 493         spin_unlock_irqrestore(&malidp->errors_lock, irqflags);
 494 }
 495
 496 static void malidp_error_stats_dump(const char *prefix,
 497                                     struct malidp_error_stats error_stats,
 498                                     struct seq_file *m)
 499 {
 500         seq_printf(m, "[%s] num_errors : %d\n", prefix,
 501                    error_stats.num_errors);
 502         seq_printf(m, "[%s] last_error_status  : 0x%08x\n", prefix,
 503                    error_stats.last_error_status);
 504         seq_printf(m, "[%s] last_error_vblank : %lld\n", prefix,
 505                    error_stats.last_error_vblank);
 506 }
 507
 508 static int malidp_show_stats(struct seq_file *m, void *arg)
 509 {
 510         struct drm_device *drm = m->private;
 511         struct malidp_drm *malidp = drm->dev_private;
 512         unsigned long irqflags;
 513         struct malidp_error_stats de_errors, se_errors;
 514
 515         spin_lock_irqsave(&malidp->errors_lock, irqflags);
 516         de_errors = malidp->de_errors;
 517         se_errors = malidp->se_errors;
 518         spin_unlock_irqrestore(&malidp->errors_lock, irqflags);
 519         malidp_error_stats_dump("DE", de_errors, m);
 520         malidp_error_stats_dump("SE", se_errors, m);
 521         return 0;
 522 }
 523
 524 static int malidp_debugfs_open(struct inode *inode, struct file *file)
 525 {
 526         return single_open(file, malidp_show_stats, inode->i_private);
 527 }
 528
 529 static ssize_t malidp_debugfs_write(struct file *file, const char __user *ubuf,
 530                                     size_t len, loff_t *offp)
 531 {
 532         struct seq_file *m = file->private_data;
 533         struct drm_device *drm = m->private;
 534         struct malidp_drm *malidp = drm->dev_private;
 535         unsigned long irqflags;
 536
 537         spin_lock_irqsave(&malidp->errors_lock, irqflags);
 538         malidp_error_stats_init(&malidp->de_errors);
 539         malidp_error_stats_init(&malidp->se_errors);
 540         spin_unlock_irqrestore(&malidp->errors_lock, irqflags);
 541         return len;
 542 }
 543
 544 static const struct file_operations malidp_debugfs_fops = {
 545         .owner = THIS_MODULE,
 546         .open = malidp_debugfs_open,
 547         .read = seq_read,
 548         .write = malidp_debugfs_write,
 549         .llseek = seq_lseek,
 550         .release = single_release,
 551 };
 552
 553 static void malidp_debugfs_init(struct drm_minor *minor)
 554 {
 555         struct malidp_drm *malidp = minor->dev->dev_private;
 556
 557         malidp_error_stats_init(&malidp->de_errors);
 558         malidp_error_stats_init(&malidp->se_errors);
 559         spin_lock_init(&malidp->errors_lock);
 560         debugfs_create_file("debug", S_IRUGO | S_IWUSR, minor->debugfs_root,
 561                             minor->dev, &malidp_debugfs_fops);
 562 }
 563
 564 #endif //CONFIG_DEBUG_FS
 565
 566 static const struct drm_driver malidp_driver = {
 567         .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 568         DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(malidp_dumb_create),
 569 #ifdef CONFIG_DEBUG_FS
 570         .debugfs_init = malidp_debugfs_init,
 571 #endif
 572         .fops = &fops,
 573         .name = "mali-dp",
 574         .desc = "ARM Mali Display Processor driver",
 575         .date = "20160106",
 576         .major = 1,
 577         .minor = 0,
 578 };
 579
 580 static const struct of_device_id  malidp_drm_of_match[] = {
 581         {
 582                 .compatible = "arm,mali-dp500",
 583                 .data = &malidp_device[MALIDP_500]
 584         },
 585         {
 586                 .compatible = "arm,mali-dp550",
 587                 .data = &malidp_device[MALIDP_550]
 588         },
 589         {
 590                 .compatible = "arm,mali-dp650",
 591                 .data = &malidp_device[MALIDP_650]
 592         },
 593         {},
 594 };
 595 MODULE_DEVICE_TABLE(of, malidp_drm_of_match);
 596
 597 static bool malidp_is_compatible_hw_id(struct malidp_hw_device *hwdev,
 598                                        const struct of_device_id *dev_id)
 599 {
 600         u32 core_id;
 601         const char *compatstr_dp500 = "arm,mali-dp500";
 602         bool is_dp500;
 603         bool dt_is_dp500;
 604
 605         /*
 606          * The DP500 CORE_ID register is in a different location, so check it
 607          * first. If the product id field matches, then this is DP500, otherwise
 608          * check the DP550/650 CORE_ID register.
 609          */
 610         core_id = malidp_hw_read(hwdev, MALIDP500_DC_BASE + MALIDP_DE_CORE_ID);
 611         /* Offset 0x18 will never read 0x500 on products other than DP500. */
 612         is_dp500 = (MALIDP_PRODUCT_ID(core_id) == 0x500);
 613         dt_is_dp500 = strnstr(dev_id->compatible, compatstr_dp500,
 614                               sizeof(dev_id->compatible)) != NULL;
 615         if (is_dp500 != dt_is_dp500) {
 616                 DRM_ERROR("Device-tree expects %s, but hardware %s DP500.\n",
 617                           dev_id->compatible, is_dp500 ? "is" : "is not");
 618                 return false;
 619         } else if (!dt_is_dp500) {
 620                 u16 product_id;
 621                 char buf[32];
 622
 623                 core_id = malidp_hw_read(hwdev,
 624                                          MALIDP550_DC_BASE + MALIDP_DE_CORE_ID);
 625                 product_id = MALIDP_PRODUCT_ID(core_id);
 626                 snprintf(buf, sizeof(buf), "arm,mali-dp%X", product_id);
 627                 if (!strnstr(dev_id->compatible, buf,
 628                              sizeof(dev_id->compatible))) {
 629                         DRM_ERROR("Device-tree expects %s, but hardware is DP%03X.\n",
 630                                   dev_id->compatible, product_id);
 631                         return false;
 632                 }
 633         }
 634         return true;
 635 }
 636
 637 static bool malidp_has_sufficient_address_space(const struct resource *res,
 638                                                 const struct of_device_id *dev_id)
 639 {
 640         resource_size_t res_size = resource_size(res);
 641         const char *compatstr_dp500 = "arm,mali-dp500";
 642
 643         if (!strnstr(dev_id->compatible, compatstr_dp500,
 644                      sizeof(dev_id->compatible)))
 645                 return res_size >= MALIDP550_ADDR_SPACE_SIZE;
 646         else if (res_size < MALIDP500_ADDR_SPACE_SIZE)
 647                 return false;
 648         return true;
 649 }
 650
 651 static ssize_t core_id_show(struct device *dev, struct device_attribute *attr,
 652                             char *buf)
 653 {
 654         struct drm_device *drm = dev_get_drvdata(dev);
 655         struct malidp_drm *malidp = drm->dev_private;
 656
 657         return snprintf(buf, PAGE_SIZE, "%08x\n", malidp->core_id);
 658 }
 659
 660 static DEVICE_ATTR_RO(core_id);
 661
 662 static struct attribute *mali_dp_attrs[] = {
 663         &dev_attr_core_id.attr,
 664         NULL,
 665 };
 666 ATTRIBUTE_GROUPS(mali_dp);
 667
 668 #define MAX_OUTPUT_CHANNELS     3
 669
 670 static int malidp_runtime_pm_suspend(struct device *dev)
 671 {
 672         struct drm_device *drm = dev_get_drvdata(dev);
 673         struct malidp_drm *malidp = drm->dev_private;
 674         struct malidp_hw_device *hwdev = malidp->dev;
 675
 676         /* we can only suspend if the hardware is in config mode */
 677         WARN_ON(!hwdev->hw->in_config_mode(hwdev));
 678
 679         malidp_se_irq_fini(hwdev);
 680         malidp_de_irq_fini(hwdev);
 681         hwdev->pm_suspended = true;
 682         clk_disable_unprepare(hwdev->mclk);
 683         clk_disable_unprepare(hwdev->aclk);
 684         clk_disable_unprepare(hwdev->pclk);
 685
 686         return 0;
 687 }
 688
 689 static int malidp_runtime_pm_resume(struct device *dev)
 690 {
 691         struct drm_device *drm = dev_get_drvdata(dev);
 692         struct malidp_drm *malidp = drm->dev_private;
 693         struct malidp_hw_device *hwdev = malidp->dev;
 694
 695         clk_prepare_enable(hwdev->pclk);
 696         clk_prepare_enable(hwdev->aclk);
 697         clk_prepare_enable(hwdev->mclk);
 698         hwdev->pm_suspended = false;
 699         malidp_de_irq_hw_init(hwdev);
 700         malidp_se_irq_hw_init(hwdev);
 701
 702         return 0;
 703 }
 704
 705 static int malidp_bind(struct device *dev)
 706 {
 707         struct resource *res;
 708         struct drm_device *drm;
 709         struct malidp_drm *malidp;
 710         struct malidp_hw_device *hwdev;
 711         struct platform_device *pdev = to_platform_device(dev);
 712         struct of_device_id const *dev_id;
 713         struct drm_encoder *encoder;
 714         /* number of lines for the R, G and B output */
 715         u8 output_width[MAX_OUTPUT_CHANNELS];
 716         int ret = 0, i;
 717         u32 version, out_depth = 0;
 718
 719         malidp = devm_kzalloc(dev, sizeof(*malidp), GFP_KERNEL);
 720         if (!malidp)
 721                 return -ENOMEM;
 722
 723         hwdev = devm_kzalloc(dev, sizeof(*hwdev), GFP_KERNEL);
 724         if (!hwdev)
 725                 return -ENOMEM;
 726
 727         hwdev->hw = (struct malidp_hw *)of_device_get_match_data(dev);
 728         malidp->dev = hwdev;
 729
 730         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 731         hwdev->regs = devm_ioremap_resource(dev, res);
 732         if (IS_ERR(hwdev->regs))
 733                 return PTR_ERR(hwdev->regs);
 734
 735         hwdev->pclk = devm_clk_get(dev, "pclk");
 736         if (IS_ERR(hwdev->pclk))
 737                 return PTR_ERR(hwdev->pclk);
 738
 739         hwdev->aclk = devm_clk_get(dev, "aclk");
 740         if (IS_ERR(hwdev->aclk))
 741                 return PTR_ERR(hwdev->aclk);
 742
 743         hwdev->mclk = devm_clk_get(dev, "mclk");
 744         if (IS_ERR(hwdev->mclk))
 745                 return PTR_ERR(hwdev->mclk);
 746
 747         hwdev->pxlclk = devm_clk_get(dev, "pxlclk");
 748         if (IS_ERR(hwdev->pxlclk))
 749                 return PTR_ERR(hwdev->pxlclk);
 750
 751         /* Get the optional framebuffer memory resource */
 752         ret = of_reserved_mem_device_init(dev);
 753         if (ret && ret != -ENODEV)
 754                 return ret;
 755
 756         drm = drm_dev_alloc(&malidp_driver, dev);
 757         if (IS_ERR(drm)) {
 758                 ret = PTR_ERR(drm);
 759                 goto alloc_fail;
 760         }
 761
 762         drm->dev_private = malidp;
 763         dev_set_drvdata(dev, drm);
 764
 765         /* Enable power management */
 766         pm_runtime_enable(dev);
 767
 768         /* Resume device to enable the clocks */
 769         if (pm_runtime_enabled(dev))
 770                 pm_runtime_get_sync(dev);
 771         else
 772                 malidp_runtime_pm_resume(dev);
 773
 774         dev_id = of_match_device(malidp_drm_of_match, dev);
 775         if (!dev_id) {
 776                 ret = -EINVAL;
 777                 goto query_hw_fail;
 778         }
 779
 780         if (!malidp_has_sufficient_address_space(res, dev_id)) {
 781                 DRM_ERROR("Insufficient address space in device-tree.\n");
 782                 ret = -EINVAL;
 783                 goto query_hw_fail;
 784         }
 785
 786         if (!malidp_is_compatible_hw_id(hwdev, dev_id)) {
 787                 ret = -EINVAL;
 788                 goto query_hw_fail;
 789         }
 790
 791         ret = hwdev->hw->query_hw(hwdev);
 792         if (ret) {
 793                 DRM_ERROR("Invalid HW configuration\n");
 794                 goto query_hw_fail;
 795         }
 796
 797         version = malidp_hw_read(hwdev, hwdev->hw->map.dc_base + MALIDP_DE_CORE_ID);
 798         DRM_INFO("found ARM Mali-DP%3x version r%dp%d\n", version >> 16,
 799                  (version >> 12) & 0xf, (version >> 8) & 0xf);
 800
 801         malidp->core_id = version;
 802
 803         ret = of_property_read_u32(dev->of_node,
 804                                         "arm,malidp-arqos-value",
 805                                         &hwdev->arqos_value);
 806         if (ret)
 807                 hwdev->arqos_value = 0x0;
 808
 809         /* set the number of lines used for output of RGB data */
 810         ret = of_property_read_u8_array(dev->of_node,
 811                                         "arm,malidp-output-port-lines",
 812                                         output_width, MAX_OUTPUT_CHANNELS);
 813         if (ret)
 814                 goto query_hw_fail;
 815
 816         for (i = 0; i < MAX_OUTPUT_CHANNELS; i++)
 817                 out_depth = (out_depth << 8) | (output_width[i] & 0xf);
 818         malidp_hw_write(hwdev, out_depth, hwdev->hw->map.out_depth_base);
 819         hwdev->output_color_depth = out_depth;
 820
 821         atomic_set(&malidp->config_valid, MALIDP_CONFIG_VALID_INIT);
 822         init_waitqueue_head(&malidp->wq);
 823
 824         ret = malidp_init(drm);
 825         if (ret < 0)
 826                 goto query_hw_fail;
 827
 828         /* Set the CRTC's port so that the encoder component can find it */
 829         malidp->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);
 830
 831         ret = component_bind_all(dev, drm);
 832         if (ret) {
 833                 DRM_ERROR("Failed to bind all components\n");
 834                 goto bind_fail;
 835         }
 836
 837         /* We expect to have a maximum of two encoders one for the actual
 838          * display and a virtual one for the writeback connector
 839          */
 840         WARN_ON(drm->mode_config.num_encoder > 2);
 841         list_for_each_entry(encoder, &drm->mode_config.encoder_list, head) {
 842                 encoder->possible_clones =
 843                                 (1 << drm->mode_config.num_encoder) -  1;
 844         }
 845
 846         ret = malidp_irq_init(pdev);
 847         if (ret < 0)
 848                 goto irq_init_fail;
 849
 850         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 851         if (ret < 0) {
 852                 DRM_ERROR("failed to initialise vblank\n");
 853                 goto vblank_fail;
 854         }
 855         pm_runtime_put(dev);
 856
 857         drm_mode_config_reset(drm);
 858
 859         drm_kms_helper_poll_init(drm);
 860
 861         ret = drm_dev_register(drm, 0);
 862         if (ret)
 863                 goto register_fail;
 864
 865         drm_fbdev_generic_setup(drm, 32);
 866
 867         return 0;
 868
 869 register_fail:
 870         drm_kms_helper_poll_fini(drm);
 871         pm_runtime_get_sync(dev);
 872 vblank_fail:
 873         malidp_se_irq_fini(hwdev);
 874         malidp_de_irq_fini(hwdev);
 875 irq_init_fail:
 876         drm_atomic_helper_shutdown(drm);
 877         component_unbind_all(dev, drm);
 878 bind_fail:
 879         of_node_put(malidp->crtc.port);
 880         malidp->crtc.port = NULL;
 881         malidp_fini(drm);
 882 query_hw_fail:
 883         pm_runtime_put(dev);
 884         if (pm_runtime_enabled(dev))
 885                 pm_runtime_disable(dev);
 886         else
 887                 malidp_runtime_pm_suspend(dev);
 888         drm->dev_private = NULL;
 889         dev_set_drvdata(dev, NULL);
 890         drm_dev_put(drm);
 891 alloc_fail:
 892         of_reserved_mem_device_release(dev);
 893
 894         return ret;
 895 }
 896
 897 static void malidp_unbind(struct device *dev)
 898 {
 899         struct drm_device *drm = dev_get_drvdata(dev);
 900         struct malidp_drm *malidp = drm->dev_private;
 901         struct malidp_hw_device *hwdev = malidp->dev;
 902
 903         drm_dev_unregister(drm);
 904         drm_kms_helper_poll_fini(drm);
 905         pm_runtime_get_sync(dev);
 906         drm_atomic_helper_shutdown(drm);
 907         malidp_se_irq_fini(hwdev);
 908         malidp_de_irq_fini(hwdev);
 909         component_unbind_all(dev, drm);
 910         of_node_put(malidp->crtc.port);
 911         malidp->crtc.port = NULL;
 912         malidp_fini(drm);
 913         pm_runtime_put(dev);
 914         if (pm_runtime_enabled(dev))
 915                 pm_runtime_disable(dev);
 916         else
 917                 malidp_runtime_pm_suspend(dev);
 918         drm->dev_private = NULL;
 919         dev_set_drvdata(dev, NULL);
 920         drm_dev_put(drm);
 921         of_reserved_mem_device_release(dev);
 922 }
 923
 924 static const struct component_master_ops malidp_master_ops = {
 925         .bind = malidp_bind,
 926         .unbind = malidp_unbind,
 927 };
 928
 929 static int malidp_compare_dev(struct device *dev, void *data)
 930 {
 931         struct device_node *np = data;
 932
 933         return dev->of_node == np;
 934 }
 935
 936 static int malidp_platform_probe(struct platform_device *pdev)
 937 {
 938         struct device_node *port;
 939         struct component_match *match = NULL;
 940
 941         if (!pdev->dev.of_node)
 942                 return -ENODEV;
 943
 944         /* there is only one output port inside each device, find it */
 945         port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
 946         if (!port)
 947                 return -ENODEV;
 948
 949         drm_of_component_match_add(&pdev->dev, &match, malidp_compare_dev,
 950                                    port);
 951         of_node_put(port);
 952         return component_master_add_with_match(&pdev->dev, &malidp_master_ops,
 953                                                match);
 954 }
 955
 956 static int malidp_platform_remove(struct platform_device *pdev)
 957 {
 958         component_master_del(&pdev->dev, &malidp_master_ops);
 959         return 0;
 960 }
 961
 962 static int __maybe_unused malidp_pm_suspend(struct device *dev)
 963 {
 964         struct drm_device *drm = dev_get_drvdata(dev);
 965
 966         return drm_mode_config_helper_suspend(drm);
 967 }
 968
 969 static int __maybe_unused malidp_pm_resume(struct device *dev)
 970 {
 971         struct drm_device *drm = dev_get_drvdata(dev);
 972
 973         drm_mode_config_helper_resume(drm);
 974
 975         return 0;
 976 }
 977
 978 static int __maybe_unused malidp_pm_suspend_late(struct device *dev)
 979 {
 980         if (!pm_runtime_status_suspended(dev)) {
 981                 malidp_runtime_pm_suspend(dev);
 982                 pm_runtime_set_suspended(dev);
 983         }
 984         return 0;
 985 }
 986
 987 static int __maybe_unused malidp_pm_resume_early(struct device *dev)
 988 {
 989         malidp_runtime_pm_resume(dev);
 990         pm_runtime_set_active(dev);
 991         return 0;
 992 }
 993
 994 static const struct dev_pm_ops malidp_pm_ops = {
 995         SET_SYSTEM_SLEEP_PM_OPS(malidp_pm_suspend, malidp_pm_resume) \
 996         SET_LATE_SYSTEM_SLEEP_PM_OPS(malidp_pm_suspend_late, malidp_pm_resume_early) \
 997         SET_RUNTIME_PM_OPS(malidp_runtime_pm_suspend, malidp_runtime_pm_resume, NULL)
 998 };
 999
1000 static struct platform_driver malidp_platform_driver = {
1001         .probe          = malidp_platform_probe,
1002         .remove         = malidp_platform_remove,
1003         .driver = {
1004                 .name = "mali-dp",
1005                 .pm = &malidp_pm_ops,
1006                 .of_match_table = malidp_drm_of_match,
1007                 .dev_groups = mali_dp_groups,
1008         },
1009 };
1010
1011 module_platform_driver(malidp_platform_driver);
1012
1013 MODULE_AUTHOR("Liviu Dudau <Liviu.Dudau@arm.com>");
1014 MODULE_DESCRIPTION("ARM Mali DP DRM driver");
1015 MODULE_LICENSE("GPL v2");