drivers/gpu/drm/ingenic/ingenic-drm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Ingenic JZ47xx KMS driver
   4 //
   5 // Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
   6
   7 #include <linux/clk.h>
   8 #include <linux/dma-mapping.h>
   9 #include <linux/module.h>
  10 #include <linux/of_device.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13
  14 #include <drm/drm_atomic.h>
  15 #include <drm/drm_atomic_helper.h>
  16 #include <drm/drm_bridge.h>
  17 #include <drm/drm_crtc.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_drv.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_fb_cma_helper.h>
  22 #include <drm/drm_fb_helper.h>
  23 #include <drm/drm_fourcc.h>
  24 #include <drm/drm_gem_framebuffer_helper.h>
  25 #include <drm/drm_irq.h>
  26 #include <drm/drm_managed.h>
  27 #include <drm/drm_of.h>
  28 #include <drm/drm_panel.h>
  29 #include <drm/drm_plane.h>
  30 #include <drm/drm_plane_helper.h>
  31 #include <drm/drm_probe_helper.h>
  32 #include <drm/drm_simple_kms_helper.h>
  33 #include <drm/drm_vblank.h>
  34
  35 #define JZ_REG_LCD_CFG                          0x00
  36 #define JZ_REG_LCD_VSYNC                        0x04
  37 #define JZ_REG_LCD_HSYNC                        0x08
  38 #define JZ_REG_LCD_VAT                          0x0C
  39 #define JZ_REG_LCD_DAH                          0x10
  40 #define JZ_REG_LCD_DAV                          0x14
  41 #define JZ_REG_LCD_PS                           0x18
  42 #define JZ_REG_LCD_CLS                          0x1C
  43 #define JZ_REG_LCD_SPL                          0x20
  44 #define JZ_REG_LCD_REV                          0x24
  45 #define JZ_REG_LCD_CTRL                         0x30
  46 #define JZ_REG_LCD_STATE                        0x34
  47 #define JZ_REG_LCD_IID                          0x38
  48 #define JZ_REG_LCD_DA0                          0x40
  49 #define JZ_REG_LCD_SA0                          0x44
  50 #define JZ_REG_LCD_FID0                         0x48
  51 #define JZ_REG_LCD_CMD0                         0x4C
  52 #define JZ_REG_LCD_DA1                          0x50
  53 #define JZ_REG_LCD_SA1                          0x54
  54 #define JZ_REG_LCD_FID1                         0x58
  55 #define JZ_REG_LCD_CMD1                         0x5C
  56
  57 #define JZ_LCD_CFG_SLCD                         BIT(31)
  58 #define JZ_LCD_CFG_PS_DISABLE                   BIT(23)
  59 #define JZ_LCD_CFG_CLS_DISABLE                  BIT(22)
  60 #define JZ_LCD_CFG_SPL_DISABLE                  BIT(21)
  61 #define JZ_LCD_CFG_REV_DISABLE                  BIT(20)
  62 #define JZ_LCD_CFG_HSYNCM                       BIT(19)
  63 #define JZ_LCD_CFG_PCLKM                        BIT(18)
  64 #define JZ_LCD_CFG_INV                          BIT(17)
  65 #define JZ_LCD_CFG_SYNC_DIR                     BIT(16)
  66 #define JZ_LCD_CFG_PS_POLARITY                  BIT(15)
  67 #define JZ_LCD_CFG_CLS_POLARITY                 BIT(14)
  68 #define JZ_LCD_CFG_SPL_POLARITY                 BIT(13)
  69 #define JZ_LCD_CFG_REV_POLARITY                 BIT(12)
  70 #define JZ_LCD_CFG_HSYNC_ACTIVE_LOW             BIT(11)
  71 #define JZ_LCD_CFG_PCLK_FALLING_EDGE            BIT(10)
  72 #define JZ_LCD_CFG_DE_ACTIVE_LOW                BIT(9)
  73 #define JZ_LCD_CFG_VSYNC_ACTIVE_LOW             BIT(8)
  74 #define JZ_LCD_CFG_18_BIT                       BIT(7)
  75 #define JZ_LCD_CFG_PDW                          (BIT(5) | BIT(4))
  76
  77 #define JZ_LCD_CFG_MODE_GENERIC_16BIT           0
  78 #define JZ_LCD_CFG_MODE_GENERIC_18BIT           BIT(7)
  79 #define JZ_LCD_CFG_MODE_GENERIC_24BIT           BIT(6)
  80
  81 #define JZ_LCD_CFG_MODE_SPECIAL_TFT_1           1
  82 #define JZ_LCD_CFG_MODE_SPECIAL_TFT_2           2
  83 #define JZ_LCD_CFG_MODE_SPECIAL_TFT_3           3
  84
  85 #define JZ_LCD_CFG_MODE_TV_OUT_P                4
  86 #define JZ_LCD_CFG_MODE_TV_OUT_I                6
  87
  88 #define JZ_LCD_CFG_MODE_SINGLE_COLOR_STN        8
  89 #define JZ_LCD_CFG_MODE_SINGLE_MONOCHROME_STN   9
  90 #define JZ_LCD_CFG_MODE_DUAL_COLOR_STN          10
  91 #define JZ_LCD_CFG_MODE_DUAL_MONOCHROME_STN     11
  92
  93 #define JZ_LCD_CFG_MODE_8BIT_SERIAL             12
  94 #define JZ_LCD_CFG_MODE_LCM                     13
  95
  96 #define JZ_LCD_VSYNC_VPS_OFFSET                 16
  97 #define JZ_LCD_VSYNC_VPE_OFFSET                 0
  98
  99 #define JZ_LCD_HSYNC_HPS_OFFSET                 16
 100 #define JZ_LCD_HSYNC_HPE_OFFSET                 0
 101
 102 #define JZ_LCD_VAT_HT_OFFSET                    16
 103 #define JZ_LCD_VAT_VT_OFFSET                    0
 104
 105 #define JZ_LCD_DAH_HDS_OFFSET                   16
 106 #define JZ_LCD_DAH_HDE_OFFSET                   0
 107
 108 #define JZ_LCD_DAV_VDS_OFFSET                   16
 109 #define JZ_LCD_DAV_VDE_OFFSET                   0
 110
 111 #define JZ_LCD_CTRL_BURST_4                     (0x0 << 28)
 112 #define JZ_LCD_CTRL_BURST_8                     (0x1 << 28)
 113 #define JZ_LCD_CTRL_BURST_16                    (0x2 << 28)
 114 #define JZ_LCD_CTRL_RGB555                      BIT(27)
 115 #define JZ_LCD_CTRL_OFUP                        BIT(26)
 116 #define JZ_LCD_CTRL_FRC_GRAYSCALE_16            (0x0 << 24)
 117 #define JZ_LCD_CTRL_FRC_GRAYSCALE_4             (0x1 << 24)
 118 #define JZ_LCD_CTRL_FRC_GRAYSCALE_2             (0x2 << 24)
 119 #define JZ_LCD_CTRL_PDD_MASK                    (0xff << 16)
 120 #define JZ_LCD_CTRL_EOF_IRQ                     BIT(13)
 121 #define JZ_LCD_CTRL_SOF_IRQ                     BIT(12)
 122 #define JZ_LCD_CTRL_OFU_IRQ                     BIT(11)
 123 #define JZ_LCD_CTRL_IFU0_IRQ                    BIT(10)
 124 #define JZ_LCD_CTRL_IFU1_IRQ                    BIT(9)
 125 #define JZ_LCD_CTRL_DD_IRQ                      BIT(8)
 126 #define JZ_LCD_CTRL_QDD_IRQ                     BIT(7)
 127 #define JZ_LCD_CTRL_REVERSE_ENDIAN              BIT(6)
 128 #define JZ_LCD_CTRL_LSB_FISRT                   BIT(5)
 129 #define JZ_LCD_CTRL_DISABLE                     BIT(4)
 130 #define JZ_LCD_CTRL_ENABLE                      BIT(3)
 131 #define JZ_LCD_CTRL_BPP_1                       0x0
 132 #define JZ_LCD_CTRL_BPP_2                       0x1
 133 #define JZ_LCD_CTRL_BPP_4                       0x2
 134 #define JZ_LCD_CTRL_BPP_8                       0x3
 135 #define JZ_LCD_CTRL_BPP_15_16                   0x4
 136 #define JZ_LCD_CTRL_BPP_18_24                   0x5
 137 #define JZ_LCD_CTRL_BPP_MASK                    (JZ_LCD_CTRL_RGB555 | (0x7 << 0))
 138
 139 #define JZ_LCD_CMD_SOF_IRQ                      BIT(31)
 140 #define JZ_LCD_CMD_EOF_IRQ                      BIT(30)
 141 #define JZ_LCD_CMD_ENABLE_PAL                   BIT(28)
 142
 143 #define JZ_LCD_SYNC_MASK                        0x3ff
 144
 145 #define JZ_LCD_STATE_EOF_IRQ                    BIT(5)
 146 #define JZ_LCD_STATE_SOF_IRQ                    BIT(4)
 147 #define JZ_LCD_STATE_DISABLED                   BIT(0)
 148
 149 struct ingenic_dma_hwdesc {
 150         u32 next;
 151         u32 addr;
 152         u32 id;
 153         u32 cmd;
 154 } __packed;
 155
 156 struct jz_soc_info {
 157         bool needs_dev_clk;
 158         unsigned int max_width, max_height;
 159 };
 160
 161 struct ingenic_drm {
 162         struct drm_device drm;
 163         struct drm_plane primary;
 164         struct drm_crtc crtc;
 165         struct drm_encoder encoder;
 166
 167         struct device *dev;
 168         struct regmap *map;
 169         struct clk *lcd_clk, *pix_clk;
 170         const struct jz_soc_info *soc_info;
 171
 172         struct ingenic_dma_hwdesc *dma_hwdesc;
 173         dma_addr_t dma_hwdesc_phys;
 174
 175         bool panel_is_sharp;
 176 };
 177
 178 static const u32 ingenic_drm_primary_formats[] = {
 179         DRM_FORMAT_XRGB1555,
 180         DRM_FORMAT_RGB565,
 181         DRM_FORMAT_XRGB8888,
 182 };
 183
 184 static bool ingenic_drm_writeable_reg(struct device *dev, unsigned int reg)
 185 {
 186         switch (reg) {
 187         case JZ_REG_LCD_IID:
 188         case JZ_REG_LCD_SA0:
 189         case JZ_REG_LCD_FID0:
 190         case JZ_REG_LCD_CMD0:
 191         case JZ_REG_LCD_SA1:
 192         case JZ_REG_LCD_FID1:
 193         case JZ_REG_LCD_CMD1:
 194                 return false;
 195         default:
 196                 return true;
 197         }
 198 }
 199
 200 static const struct regmap_config ingenic_drm_regmap_config = {
 201         .reg_bits = 32,
 202         .val_bits = 32,
 203         .reg_stride = 4,
 204
 205         .max_register = JZ_REG_LCD_CMD1,
 206         .writeable_reg = ingenic_drm_writeable_reg,
 207 };
 208
 209 static inline struct ingenic_drm *drm_device_get_priv(struct drm_device *drm)
 210 {
 211         return container_of(drm, struct ingenic_drm, drm);
 212 }
 213
 214 static inline struct ingenic_drm *drm_crtc_get_priv(struct drm_crtc *crtc)
 215 {
 216         return container_of(crtc, struct ingenic_drm, crtc);
 217 }
 218
 219 static inline struct ingenic_drm *
 220 drm_encoder_get_priv(struct drm_encoder *encoder)
 221 {
 222         return container_of(encoder, struct ingenic_drm, encoder);
 223 }
 224
 225 static inline struct ingenic_drm *drm_plane_get_priv(struct drm_plane *plane)
 226 {
 227         return container_of(plane, struct ingenic_drm, primary);
 228 }
 229
 230 static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
 231                                            struct drm_crtc_state *state)
 232 {
 233         struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
 234
 235         regmap_write(priv->map, JZ_REG_LCD_STATE, 0);
 236
 237         regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
 238                            JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE,
 239                            JZ_LCD_CTRL_ENABLE);
 240
 241         drm_crtc_vblank_on(crtc);
 242 }
 243
 244 static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc,
 245                                             struct drm_crtc_state *state)
 246 {
 247         struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
 248         unsigned int var;
 249
 250         drm_crtc_vblank_off(crtc);
 251
 252         regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
 253                            JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE);
 254
 255         regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var,
 256                                  var & JZ_LCD_STATE_DISABLED,
 257                                  1000, 0);
 258 }
 259
 260 static void ingenic_drm_crtc_update_timings(struct ingenic_drm *priv,
 261                                             struct drm_display_mode *mode)
 262 {
 263         unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht;
 264
 265         vpe = mode->vsync_end - mode->vsync_start;
 266         vds = mode->vtotal - mode->vsync_start;
 267         vde = vds + mode->vdisplay;
 268         vt = vde + mode->vsync_start - mode->vdisplay;
 269
 270         hpe = mode->hsync_end - mode->hsync_start;
 271         hds = mode->htotal - mode->hsync_start;
 272         hde = hds + mode->hdisplay;
 273         ht = hde + mode->hsync_start - mode->hdisplay;
 274
 275         regmap_write(priv->map, JZ_REG_LCD_VSYNC,
 276                      0 << JZ_LCD_VSYNC_VPS_OFFSET |
 277                      vpe << JZ_LCD_VSYNC_VPE_OFFSET);
 278
 279         regmap_write(priv->map, JZ_REG_LCD_HSYNC,
 280                      0 << JZ_LCD_HSYNC_HPS_OFFSET |
 281                      hpe << JZ_LCD_HSYNC_HPE_OFFSET);
 282
 283         regmap_write(priv->map, JZ_REG_LCD_VAT,
 284                      ht << JZ_LCD_VAT_HT_OFFSET |
 285                      vt << JZ_LCD_VAT_VT_OFFSET);
 286
 287         regmap_write(priv->map, JZ_REG_LCD_DAH,
 288                      hds << JZ_LCD_DAH_HDS_OFFSET |
 289                      hde << JZ_LCD_DAH_HDE_OFFSET);
 290         regmap_write(priv->map, JZ_REG_LCD_DAV,
 291                      vds << JZ_LCD_DAV_VDS_OFFSET |
 292                      vde << JZ_LCD_DAV_VDE_OFFSET);
 293
 294         if (priv->panel_is_sharp) {
 295                 regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
 296                 regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
 297                 regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
 298                 regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
 299         }
 300 }
 301
 302 static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
 303                                          const struct drm_format_info *finfo)
 304 {
 305         unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
 306
 307         switch (finfo->format) {
 308         case DRM_FORMAT_XRGB1555:
 309                 ctrl |= JZ_LCD_CTRL_RGB555;
 310                 /* fall-through */
 311         case DRM_FORMAT_RGB565:
 312                 ctrl |= JZ_LCD_CTRL_BPP_15_16;
 313                 break;
 314         case DRM_FORMAT_XRGB8888:
 315                 ctrl |= JZ_LCD_CTRL_BPP_18_24;
 316                 break;
 317         }
 318
 319         regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
 320                            JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
 321                            JZ_LCD_CTRL_BPP_MASK, ctrl);
 322 }
 323
 324 static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
 325                                          struct drm_crtc_state *state)
 326 {
 327         struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
 328         long rate;
 329
 330         if (!drm_atomic_crtc_needs_modeset(state))
 331                 return 0;
 332
 333         if (state->mode.hdisplay > priv->soc_info->max_width ||
 334             state->mode.vdisplay > priv->soc_info->max_height)
 335                 return -EINVAL;
 336
 337         rate = clk_round_rate(priv->pix_clk,
 338                               state->adjusted_mode.clock * 1000);
 339         if (rate < 0)
 340                 return rate;
 341
 342         return 0;
 343 }
 344
 345 static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
 346                                           struct drm_crtc_state *oldstate)
 347 {
 348         struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
 349         struct drm_crtc_state *state = crtc->state;
 350         struct drm_pending_vblank_event *event = state->event;
 351         struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
 352         const struct drm_format_info *finfo;
 353
 354         if (drm_atomic_crtc_needs_modeset(state)) {
 355                 finfo = drm_format_info(drm_fb->format->format);
 356
 357                 ingenic_drm_crtc_update_timings(priv, &state->mode);
 358                 ingenic_drm_crtc_update_ctrl(priv, finfo);
 359
 360                 clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
 361
 362                 regmap_write(priv->map, JZ_REG_LCD_DA0, priv->dma_hwdesc->next);
 363         }
 364
 365         if (event) {
 366                 state->event = NULL;
 367
 368                 spin_lock_irq(&crtc->dev->event_lock);
 369                 if (drm_crtc_vblank_get(crtc) == 0)
 370                         drm_crtc_arm_vblank_event(crtc, event);
 371                 else
 372                         drm_crtc_send_vblank_event(crtc, event);
 373                 spin_unlock_irq(&crtc->dev->event_lock);
 374         }
 375 }
 376
 377 static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
 378                                             struct drm_plane_state *oldstate)
 379 {
 380         struct ingenic_drm *priv = drm_plane_get_priv(plane);
 381         struct drm_plane_state *state = plane->state;
 382         unsigned int width, height, cpp;
 383         dma_addr_t addr;
 384
 385         if (state && state->fb) {
 386                 addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
 387                 width = state->src_w >> 16;
 388                 height = state->src_h >> 16;
 389                 cpp = state->fb->format->cpp[plane->index];
 390
 391                 priv->dma_hwdesc->addr = addr;
 392                 priv->dma_hwdesc->cmd = width * height * cpp / 4;
 393                 priv->dma_hwdesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
 394         }
 395 }
 396
 397 static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
 398                                                 struct drm_crtc_state *crtc_state,
 399                                                 struct drm_connector_state *conn_state)
 400 {
 401         struct ingenic_drm *priv = drm_encoder_get_priv(encoder);
 402         struct drm_display_mode *mode = &crtc_state->adjusted_mode;
 403         struct drm_connector *conn = conn_state->connector;
 404         struct drm_display_info *info = &conn->display_info;
 405         unsigned int cfg;
 406
 407         priv->panel_is_sharp = info->bus_flags & DRM_BUS_FLAG_SHARP_SIGNALS;
 408
 409         if (priv->panel_is_sharp) {
 410                 cfg = JZ_LCD_CFG_MODE_SPECIAL_TFT_1 | JZ_LCD_CFG_REV_POLARITY;
 411         } else {
 412                 cfg = JZ_LCD_CFG_PS_DISABLE | JZ_LCD_CFG_CLS_DISABLE
 413                     | JZ_LCD_CFG_SPL_DISABLE | JZ_LCD_CFG_REV_DISABLE;
 414         }
 415
 416         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 417                 cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
 418         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 419                 cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
 420         if (info->bus_flags & DRM_BUS_FLAG_DE_LOW)
 421                 cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
 422         if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
 423                 cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
 424
 425         if (!priv->panel_is_sharp) {
 426                 if (conn->connector_type == DRM_MODE_CONNECTOR_TV) {
 427                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 428                                 cfg |= JZ_LCD_CFG_MODE_TV_OUT_I;
 429                         else
 430                                 cfg |= JZ_LCD_CFG_MODE_TV_OUT_P;
 431                 } else {
 432                         switch (*info->bus_formats) {
 433                         case MEDIA_BUS_FMT_RGB565_1X16:
 434                                 cfg |= JZ_LCD_CFG_MODE_GENERIC_16BIT;
 435                                 break;
 436                         case MEDIA_BUS_FMT_RGB666_1X18:
 437                                 cfg |= JZ_LCD_CFG_MODE_GENERIC_18BIT;
 438                                 break;
 439                         case MEDIA_BUS_FMT_RGB888_1X24:
 440                                 cfg |= JZ_LCD_CFG_MODE_GENERIC_24BIT;
 441                                 break;
 442                         case MEDIA_BUS_FMT_RGB888_3X8:
 443                                 cfg |= JZ_LCD_CFG_MODE_8BIT_SERIAL;
 444                                 break;
 445                         default:
 446                                 break;
 447                         }
 448                 }
 449         }
 450
 451         regmap_write(priv->map, JZ_REG_LCD_CFG, cfg);
 452 }
 453
 454 static int ingenic_drm_encoder_atomic_check(struct drm_encoder *encoder,
 455                                             struct drm_crtc_state *crtc_state,
 456                                             struct drm_connector_state *conn_state)
 457 {
 458         struct drm_display_info *info = &conn_state->connector->display_info;
 459
 460         if (info->num_bus_formats != 1)
 461                 return -EINVAL;
 462
 463         if (conn_state->connector->connector_type == DRM_MODE_CONNECTOR_TV)
 464                 return 0;
 465
 466         switch (*info->bus_formats) {
 467         case MEDIA_BUS_FMT_RGB565_1X16:
 468         case MEDIA_BUS_FMT_RGB666_1X18:
 469         case MEDIA_BUS_FMT_RGB888_1X24:
 470         case MEDIA_BUS_FMT_RGB888_3X8:
 471                 return 0;
 472         default:
 473                 return -EINVAL;
 474         }
 475 }
 476
 477 static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
 478 {
 479         struct ingenic_drm *priv = drm_device_get_priv(arg);
 480         unsigned int state;
 481
 482         regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
 483
 484         regmap_update_bits(priv->map, JZ_REG_LCD_STATE,
 485                            JZ_LCD_STATE_EOF_IRQ, 0);
 486
 487         if (state & JZ_LCD_STATE_EOF_IRQ)
 488                 drm_crtc_handle_vblank(&priv->crtc);
 489
 490         return IRQ_HANDLED;
 491 }
 492
 493 static int ingenic_drm_enable_vblank(struct drm_crtc *crtc)
 494 {
 495         struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
 496
 497         regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
 498                            JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
 499
 500         return 0;
 501 }
 502
 503 static void ingenic_drm_disable_vblank(struct drm_crtc *crtc)
 504 {
 505         struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
 506
 507         regmap_update_bits(priv->map, JZ_REG_LCD_CTRL, JZ_LCD_CTRL_EOF_IRQ, 0);
 508 }
 509
 510 DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops);
 511
 512 static struct drm_driver ingenic_drm_driver_data = {
 513         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 514         .name                   = "ingenic-drm",
 515         .desc                   = "DRM module for Ingenic SoCs",
 516         .date                   = "20190422",
 517         .major                  = 1,
 518         .minor                  = 0,
 519         .patchlevel             = 0,
 520
 521         .fops                   = &ingenic_drm_fops,
 522         DRM_GEM_CMA_DRIVER_OPS,
 523
 524         .irq_handler            = ingenic_drm_irq_handler,
 525 };
 526
 527 static const struct drm_plane_funcs ingenic_drm_primary_plane_funcs = {
 528         .update_plane           = drm_atomic_helper_update_plane,
 529         .disable_plane          = drm_atomic_helper_disable_plane,
 530         .reset                  = drm_atomic_helper_plane_reset,
 531         .destroy                = drm_plane_cleanup,
 532
 533         .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 534         .atomic_destroy_state   = drm_atomic_helper_plane_destroy_state,
 535 };
 536
 537 static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {
 538         .set_config             = drm_atomic_helper_set_config,
 539         .page_flip              = drm_atomic_helper_page_flip,
 540         .reset                  = drm_atomic_helper_crtc_reset,
 541         .destroy                = drm_crtc_cleanup,
 542
 543         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 544         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
 545
 546         .enable_vblank          = ingenic_drm_enable_vblank,
 547         .disable_vblank         = ingenic_drm_disable_vblank,
 548
 549         .gamma_set              = drm_atomic_helper_legacy_gamma_set,
 550 };
 551
 552 static const struct drm_plane_helper_funcs ingenic_drm_plane_helper_funcs = {
 553         .atomic_update          = ingenic_drm_plane_atomic_update,
 554         .prepare_fb             = drm_gem_fb_prepare_fb,
 555 };
 556
 557 static const struct drm_crtc_helper_funcs ingenic_drm_crtc_helper_funcs = {
 558         .atomic_enable          = ingenic_drm_crtc_atomic_enable,
 559         .atomic_disable         = ingenic_drm_crtc_atomic_disable,
 560         .atomic_flush           = ingenic_drm_crtc_atomic_flush,
 561         .atomic_check           = ingenic_drm_crtc_atomic_check,
 562 };
 563
 564 static const struct drm_encoder_helper_funcs ingenic_drm_encoder_helper_funcs = {
 565         .atomic_mode_set        = ingenic_drm_encoder_atomic_mode_set,
 566         .atomic_check           = ingenic_drm_encoder_atomic_check,
 567 };
 568
 569 static const struct drm_mode_config_funcs ingenic_drm_mode_config_funcs = {
 570         .fb_create              = drm_gem_fb_create,
 571         .output_poll_changed    = drm_fb_helper_output_poll_changed,
 572         .atomic_check           = drm_atomic_helper_check,
 573         .atomic_commit          = drm_atomic_helper_commit,
 574 };
 575
 576 static void ingenic_drm_free_dma_hwdesc(void *d)
 577 {
 578         struct ingenic_drm *priv = d;
 579
 580         dma_free_coherent(priv->dev, sizeof(*priv->dma_hwdesc),
 581                           priv->dma_hwdesc, priv->dma_hwdesc_phys);
 582 }
 583
 584 static int ingenic_drm_probe(struct platform_device *pdev)
 585 {
 586         const struct jz_soc_info *soc_info;
 587         struct device *dev = &pdev->dev;
 588         struct ingenic_drm *priv;
 589         struct clk *parent_clk;
 590         struct drm_bridge *bridge;
 591         struct drm_panel *panel;
 592         struct drm_device *drm;
 593         void __iomem *base;
 594         long parent_rate;
 595         int ret, irq;
 596
 597         soc_info = of_device_get_match_data(dev);
 598         if (!soc_info) {
 599                 dev_err(dev, "Missing platform data\n");
 600                 return -EINVAL;
 601         }
 602
 603         priv = devm_drm_dev_alloc(dev, &ingenic_drm_driver_data,
 604                                   struct ingenic_drm, drm);
 605         if (IS_ERR(priv))
 606                 return PTR_ERR(priv);
 607
 608         priv->soc_info = soc_info;
 609         priv->dev = dev;
 610         drm = &priv->drm;
 611
 612         platform_set_drvdata(pdev, priv);
 613
 614         ret = drmm_mode_config_init(drm);
 615         if (ret)
 616                 return ret;
 617
 618         drm->mode_config.min_width = 0;
 619         drm->mode_config.min_height = 0;
 620         drm->mode_config.max_width = soc_info->max_width;
 621         drm->mode_config.max_height = 4095;
 622         drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
 623
 624         base = devm_platform_ioremap_resource(pdev, 0);
 625         if (IS_ERR(base)) {
 626                 dev_err(dev, "Failed to get memory resource");
 627                 return PTR_ERR(base);
 628         }
 629
 630         priv->map = devm_regmap_init_mmio(dev, base,
 631                                           &ingenic_drm_regmap_config);
 632         if (IS_ERR(priv->map)) {
 633                 dev_err(dev, "Failed to create regmap");
 634                 return PTR_ERR(priv->map);
 635         }
 636
 637         irq = platform_get_irq(pdev, 0);
 638         if (irq < 0)
 639                 return irq;
 640
 641         if (soc_info->needs_dev_clk) {
 642                 priv->lcd_clk = devm_clk_get(dev, "lcd");
 643                 if (IS_ERR(priv->lcd_clk)) {
 644                         dev_err(dev, "Failed to get lcd clock");
 645                         return PTR_ERR(priv->lcd_clk);
 646                 }
 647         }
 648
 649         priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
 650         if (IS_ERR(priv->pix_clk)) {
 651                 dev_err(dev, "Failed to get pixel clock");
 652                 return PTR_ERR(priv->pix_clk);
 653         }
 654
 655         ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
 656         if (ret) {
 657                 if (ret != -EPROBE_DEFER)
 658                         dev_err(dev, "Failed to get panel handle");
 659                 return ret;
 660         }
 661
 662         if (panel)
 663                 bridge = devm_drm_panel_bridge_add_typed(dev, panel,
 664                                                          DRM_MODE_CONNECTOR_DPI);
 665
 666         priv->dma_hwdesc = dma_alloc_coherent(dev, sizeof(*priv->dma_hwdesc),
 667                                               &priv->dma_hwdesc_phys,
 668                                               GFP_KERNEL);
 669         if (!priv->dma_hwdesc)
 670                 return -ENOMEM;
 671
 672         ret = devm_add_action_or_reset(dev, ingenic_drm_free_dma_hwdesc, priv);
 673         if (ret)
 674                 return ret;
 675
 676         priv->dma_hwdesc->next = priv->dma_hwdesc_phys;
 677         priv->dma_hwdesc->id = 0xdeafbead;
 678
 679         drm_plane_helper_add(&priv->primary, &ingenic_drm_plane_helper_funcs);
 680
 681         ret = drm_universal_plane_init(drm, &priv->primary,
 682                                        0, &ingenic_drm_primary_plane_funcs,
 683                                        ingenic_drm_primary_formats,
 684                                        ARRAY_SIZE(ingenic_drm_primary_formats),
 685                                        NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
 686         if (ret) {
 687                 dev_err(dev, "Failed to register primary plane: %i", ret);
 688                 return ret;
 689         }
 690
 691         drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
 692
 693         ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
 694                                         NULL, &ingenic_drm_crtc_funcs, NULL);
 695         if (ret) {
 696                 dev_err(dev, "Failed to init CRTC: %i", ret);
 697                 return ret;
 698         }
 699
 700         priv->encoder.possible_crtcs = 1;
 701
 702         drm_encoder_helper_add(&priv->encoder,
 703                                &ingenic_drm_encoder_helper_funcs);
 704
 705         ret = drm_simple_encoder_init(drm, &priv->encoder,
 706                                       DRM_MODE_ENCODER_DPI);
 707         if (ret) {
 708                 dev_err(dev, "Failed to init encoder: %i", ret);
 709                 return ret;
 710         }
 711
 712         ret = drm_bridge_attach(&priv->encoder, bridge, NULL, 0);
 713         if (ret) {
 714                 dev_err(dev, "Unable to attach bridge");
 715                 return ret;
 716         }
 717
 718         ret = drm_irq_install(drm, irq);
 719         if (ret) {
 720                 dev_err(dev, "Unable to install IRQ handler");
 721                 return ret;
 722         }
 723
 724         ret = drm_vblank_init(drm, 1);
 725         if (ret) {
 726                 dev_err(dev, "Failed calling drm_vblank_init()");
 727                 return ret;
 728         }
 729
 730         drm_mode_config_reset(drm);
 731
 732         ret = clk_prepare_enable(priv->pix_clk);
 733         if (ret) {
 734                 dev_err(dev, "Unable to start pixel clock");
 735                 return ret;
 736         }
 737
 738         if (priv->lcd_clk) {
 739                 parent_clk = clk_get_parent(priv->lcd_clk);
 740                 parent_rate = clk_get_rate(parent_clk);
 741
 742                 /* LCD Device clock must be 3x the pixel clock for STN panels,
 743                  * or 1.5x the pixel clock for TFT panels. To avoid having to
 744                  * check for the LCD device clock everytime we do a mode change,
 745                  * we set the LCD device clock to the highest rate possible.
 746                  */
 747                 ret = clk_set_rate(priv->lcd_clk, parent_rate);
 748                 if (ret) {
 749                         dev_err(dev, "Unable to set LCD clock rate");
 750                         goto err_pixclk_disable;
 751                 }
 752
 753                 ret = clk_prepare_enable(priv->lcd_clk);
 754                 if (ret) {
 755                         dev_err(dev, "Unable to start lcd clock");
 756                         goto err_pixclk_disable;
 757                 }
 758         }
 759
 760         ret = drm_dev_register(drm, 0);
 761         if (ret) {
 762                 dev_err(dev, "Failed to register DRM driver");
 763                 goto err_devclk_disable;
 764         }
 765
 766         drm_fbdev_generic_setup(drm, 32);
 767
 768         return 0;
 769
 770 err_devclk_disable:
 771         if (priv->lcd_clk)
 772                 clk_disable_unprepare(priv->lcd_clk);
 773 err_pixclk_disable:
 774         clk_disable_unprepare(priv->pix_clk);
 775         return ret;
 776 }
 777
 778 static int ingenic_drm_remove(struct platform_device *pdev)
 779 {
 780         struct ingenic_drm *priv = platform_get_drvdata(pdev);
 781
 782         if (priv->lcd_clk)
 783                 clk_disable_unprepare(priv->lcd_clk);
 784         clk_disable_unprepare(priv->pix_clk);
 785
 786         drm_dev_unregister(&priv->drm);
 787         drm_atomic_helper_shutdown(&priv->drm);
 788
 789         return 0;
 790 }
 791
 792 static const struct jz_soc_info jz4740_soc_info = {
 793         .needs_dev_clk = true,
 794         .max_width = 800,
 795         .max_height = 600,
 796 };
 797
 798 static const struct jz_soc_info jz4725b_soc_info = {
 799         .needs_dev_clk = false,
 800         .max_width = 800,
 801         .max_height = 600,
 802 };
 803
 804 static const struct jz_soc_info jz4770_soc_info = {
 805         .needs_dev_clk = false,
 806         .max_width = 1280,
 807         .max_height = 720,
 808 };
 809
 810 static const struct of_device_id ingenic_drm_of_match[] = {
 811         { .compatible = "ingenic,jz4740-lcd", .data = &jz4740_soc_info },
 812         { .compatible = "ingenic,jz4725b-lcd", .data = &jz4725b_soc_info },
 813         { .compatible = "ingenic,jz4770-lcd", .data = &jz4770_soc_info },
 814         { /* sentinel */ },
 815 };
 816 MODULE_DEVICE_TABLE(of, ingenic_drm_of_match);
 817
 818 static struct platform_driver ingenic_drm_driver = {
 819         .driver = {
 820                 .name = "ingenic-drm",
 821                 .of_match_table = of_match_ptr(ingenic_drm_of_match),
 822         },
 823         .probe = ingenic_drm_probe,
 824         .remove = ingenic_drm_remove,
 825 };
 826 module_platform_driver(ingenic_drm_driver);
 827
 828 MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
 829 MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n");
 830 MODULE_LICENSE("GPL v2");