drivers/gpu/drm/tiny/arcpgu.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ARC PGU DRM driver.
   4  *
   5  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <drm/drm_atomic_helper.h>
  10 #include <drm/drm_debugfs.h>
  11 #include <drm/drm_device.h>
  12 #include <drm/drm_drv.h>
  13 #include <drm/drm_fb_cma_helper.h>
  14 #include <drm/drm_fb_helper.h>
  15 #include <drm/drm_fourcc.h>
  16 #include <drm/drm_gem_cma_helper.h>
  17 #include <drm/drm_gem_framebuffer_helper.h>
  18 #include <drm/drm_module.h>
  19 #include <drm/drm_of.h>
  20 #include <drm/drm_probe_helper.h>
  21 #include <drm/drm_simple_kms_helper.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/module.h>
  24 #include <linux/of_reserved_mem.h>
  25 #include <linux/platform_device.h>
  26
  27 #define ARCPGU_REG_CTRL         0x00
  28 #define ARCPGU_REG_STAT         0x04
  29 #define ARCPGU_REG_FMT          0x10
  30 #define ARCPGU_REG_HSYNC        0x14
  31 #define ARCPGU_REG_VSYNC        0x18
  32 #define ARCPGU_REG_ACTIVE       0x1c
  33 #define ARCPGU_REG_BUF0_ADDR    0x40
  34 #define ARCPGU_REG_STRIDE       0x50
  35 #define ARCPGU_REG_START_SET    0x84
  36
  37 #define ARCPGU_REG_ID           0x3FC
  38
  39 #define ARCPGU_CTRL_ENABLE_MASK 0x02
  40 #define ARCPGU_CTRL_VS_POL_MASK 0x1
  41 #define ARCPGU_CTRL_VS_POL_OFST 0x3
  42 #define ARCPGU_CTRL_HS_POL_MASK 0x1
  43 #define ARCPGU_CTRL_HS_POL_OFST 0x4
  44 #define ARCPGU_MODE_XRGB8888    BIT(2)
  45 #define ARCPGU_STAT_BUSY_MASK   0x02
  46
  47 struct arcpgu_drm_private {
  48         struct drm_device       drm;
  49         void __iomem            *regs;
  50         struct clk              *clk;
  51         struct drm_simple_display_pipe pipe;
  52         struct drm_connector    sim_conn;
  53 };
  54
  55 #define dev_to_arcpgu(x) container_of(x, struct arcpgu_drm_private, drm)
  56
  57 #define pipe_to_arcpgu_priv(x) container_of(x, struct arcpgu_drm_private, pipe)
  58
  59 static inline void arc_pgu_write(struct arcpgu_drm_private *arcpgu,
  60                                  unsigned int reg, u32 value)
  61 {
  62         iowrite32(value, arcpgu->regs + reg);
  63 }
  64
  65 static inline u32 arc_pgu_read(struct arcpgu_drm_private *arcpgu,
  66                                unsigned int reg)
  67 {
  68         return ioread32(arcpgu->regs + reg);
  69 }
  70
  71 #define XRES_DEF        640
  72 #define YRES_DEF        480
  73
  74 #define XRES_MAX        8192
  75 #define YRES_MAX        8192
  76
  77 static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
  78 {
  79         int count;
  80
  81         count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
  82         drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
  83         return count;
  84 }
  85
  86 static const struct drm_connector_helper_funcs
  87 arcpgu_drm_connector_helper_funcs = {
  88         .get_modes = arcpgu_drm_connector_get_modes,
  89 };
  90
  91 static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
  92         .reset = drm_atomic_helper_connector_reset,
  93         .fill_modes = drm_helper_probe_single_connector_modes,
  94         .destroy = drm_connector_cleanup,
  95         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  96         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  97 };
  98
  99 static int arcpgu_drm_sim_init(struct drm_device *drm, struct drm_connector *connector)
 100 {
 101         drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
 102         return drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
 103                                   DRM_MODE_CONNECTOR_VIRTUAL);
 104 }
 105
 106 #define ENCODE_PGU_XY(x, y)     ((((x) - 1) << 16) | ((y) - 1))
 107
 108 static const u32 arc_pgu_supported_formats[] = {
 109         DRM_FORMAT_RGB565,
 110         DRM_FORMAT_XRGB8888,
 111         DRM_FORMAT_ARGB8888,
 112 };
 113
 114 static void arc_pgu_set_pxl_fmt(struct arcpgu_drm_private *arcpgu)
 115 {
 116         const struct drm_framebuffer *fb = arcpgu->pipe.plane.state->fb;
 117         uint32_t pixel_format = fb->format->format;
 118         u32 format = DRM_FORMAT_INVALID;
 119         int i;
 120         u32 reg_ctrl;
 121
 122         for (i = 0; i < ARRAY_SIZE(arc_pgu_supported_formats); i++) {
 123                 if (arc_pgu_supported_formats[i] == pixel_format)
 124                         format = arc_pgu_supported_formats[i];
 125         }
 126
 127         if (WARN_ON(format == DRM_FORMAT_INVALID))
 128                 return;
 129
 130         reg_ctrl = arc_pgu_read(arcpgu, ARCPGU_REG_CTRL);
 131         if (format == DRM_FORMAT_RGB565)
 132                 reg_ctrl &= ~ARCPGU_MODE_XRGB8888;
 133         else
 134                 reg_ctrl |= ARCPGU_MODE_XRGB8888;
 135         arc_pgu_write(arcpgu, ARCPGU_REG_CTRL, reg_ctrl);
 136 }
 137
 138 static enum drm_mode_status arc_pgu_mode_valid(struct drm_simple_display_pipe *pipe,
 139                                                const struct drm_display_mode *mode)
 140 {
 141         struct arcpgu_drm_private *arcpgu = pipe_to_arcpgu_priv(pipe);
 142         long rate, clk_rate = mode->clock * 1000;
 143         long diff = clk_rate / 200; /* +-0.5% allowed by HDMI spec */
 144
 145         rate = clk_round_rate(arcpgu->clk, clk_rate);
 146         if ((max(rate, clk_rate) - min(rate, clk_rate) < diff) && (rate > 0))
 147                 return MODE_OK;
 148
 149         return MODE_NOCLOCK;
 150 }
 151
 152 static void arc_pgu_mode_set(struct arcpgu_drm_private *arcpgu)
 153 {
 154         struct drm_display_mode *m = &arcpgu->pipe.crtc.state->adjusted_mode;
 155         u32 val;
 156
 157         arc_pgu_write(arcpgu, ARCPGU_REG_FMT,
 158                       ENCODE_PGU_XY(m->crtc_htotal, m->crtc_vtotal));
 159
 160         arc_pgu_write(arcpgu, ARCPGU_REG_HSYNC,
 161                       ENCODE_PGU_XY(m->crtc_hsync_start - m->crtc_hdisplay,
 162                                     m->crtc_hsync_end - m->crtc_hdisplay));
 163
 164         arc_pgu_write(arcpgu, ARCPGU_REG_VSYNC,
 165                       ENCODE_PGU_XY(m->crtc_vsync_start - m->crtc_vdisplay,
 166                                     m->crtc_vsync_end - m->crtc_vdisplay));
 167
 168         arc_pgu_write(arcpgu, ARCPGU_REG_ACTIVE,
 169                       ENCODE_PGU_XY(m->crtc_hblank_end - m->crtc_hblank_start,
 170                                     m->crtc_vblank_end - m->crtc_vblank_start));
 171
 172         val = arc_pgu_read(arcpgu, ARCPGU_REG_CTRL);
 173
 174         if (m->flags & DRM_MODE_FLAG_PVSYNC)
 175                 val |= ARCPGU_CTRL_VS_POL_MASK << ARCPGU_CTRL_VS_POL_OFST;
 176         else
 177                 val &= ~(ARCPGU_CTRL_VS_POL_MASK << ARCPGU_CTRL_VS_POL_OFST);
 178
 179         if (m->flags & DRM_MODE_FLAG_PHSYNC)
 180                 val |= ARCPGU_CTRL_HS_POL_MASK << ARCPGU_CTRL_HS_POL_OFST;
 181         else
 182                 val &= ~(ARCPGU_CTRL_HS_POL_MASK << ARCPGU_CTRL_HS_POL_OFST);
 183
 184         arc_pgu_write(arcpgu, ARCPGU_REG_CTRL, val);
 185         arc_pgu_write(arcpgu, ARCPGU_REG_STRIDE, 0);
 186         arc_pgu_write(arcpgu, ARCPGU_REG_START_SET, 1);
 187
 188         arc_pgu_set_pxl_fmt(arcpgu);
 189
 190         clk_set_rate(arcpgu->clk, m->crtc_clock * 1000);
 191 }
 192
 193 static void arc_pgu_enable(struct drm_simple_display_pipe *pipe,
 194                            struct drm_crtc_state *crtc_state,
 195                            struct drm_plane_state *plane_state)
 196 {
 197         struct arcpgu_drm_private *arcpgu = pipe_to_arcpgu_priv(pipe);
 198
 199         arc_pgu_mode_set(arcpgu);
 200
 201         clk_prepare_enable(arcpgu->clk);
 202         arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
 203                       arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) |
 204                       ARCPGU_CTRL_ENABLE_MASK);
 205 }
 206
 207 static void arc_pgu_disable(struct drm_simple_display_pipe *pipe)
 208 {
 209         struct arcpgu_drm_private *arcpgu = pipe_to_arcpgu_priv(pipe);
 210
 211         clk_disable_unprepare(arcpgu->clk);
 212         arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
 213                               arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) &
 214                               ~ARCPGU_CTRL_ENABLE_MASK);
 215 }
 216
 217 static void arc_pgu_update(struct drm_simple_display_pipe *pipe,
 218                            struct drm_plane_state *state)
 219 {
 220         struct arcpgu_drm_private *arcpgu;
 221         struct drm_gem_cma_object *gem;
 222
 223         if (!pipe->plane.state->fb)
 224                 return;
 225
 226         arcpgu = pipe_to_arcpgu_priv(pipe);
 227         gem = drm_fb_cma_get_gem_obj(pipe->plane.state->fb, 0);
 228         arc_pgu_write(arcpgu, ARCPGU_REG_BUF0_ADDR, gem->paddr);
 229 }
 230
 231 static const struct drm_simple_display_pipe_funcs arc_pgu_pipe_funcs = {
 232         .update = arc_pgu_update,
 233         .mode_valid = arc_pgu_mode_valid,
 234         .enable = arc_pgu_enable,
 235         .disable = arc_pgu_disable,
 236 };
 237
 238 static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
 239         .fb_create  = drm_gem_fb_create,
 240         .atomic_check = drm_atomic_helper_check,
 241         .atomic_commit = drm_atomic_helper_commit,
 242 };
 243
 244 DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
 245
 246 static int arcpgu_load(struct arcpgu_drm_private *arcpgu)
 247 {
 248         struct platform_device *pdev = to_platform_device(arcpgu->drm.dev);
 249         struct device_node *encoder_node = NULL, *endpoint_node = NULL;
 250         struct drm_connector *connector = NULL;
 251         struct drm_device *drm = &arcpgu->drm;
 252         struct resource *res;
 253         int ret;
 254
 255         arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
 256         if (IS_ERR(arcpgu->clk))
 257                 return PTR_ERR(arcpgu->clk);
 258
 259         ret = drmm_mode_config_init(drm);
 260         if (ret)
 261                 return ret;
 262
 263         drm->mode_config.min_width = 0;
 264         drm->mode_config.min_height = 0;
 265         drm->mode_config.max_width = 1920;
 266         drm->mode_config.max_height = 1080;
 267         drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
 268
 269         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 270         arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
 271         if (IS_ERR(arcpgu->regs))
 272                 return PTR_ERR(arcpgu->regs);
 273
 274         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
 275                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
 276
 277         /* Get the optional framebuffer memory resource */
 278         ret = of_reserved_mem_device_init(drm->dev);
 279         if (ret && ret != -ENODEV)
 280                 return ret;
 281
 282         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
 283                 return -ENODEV;
 284
 285         /*
 286          * There is only one output port inside each device. It is linked with
 287          * encoder endpoint.
 288          */
 289         endpoint_node = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
 290         if (endpoint_node) {
 291                 encoder_node = of_graph_get_remote_port_parent(endpoint_node);
 292                 of_node_put(endpoint_node);
 293         } else {
 294                 connector = &arcpgu->sim_conn;
 295                 dev_info(drm->dev, "no encoder found. Assumed virtual LCD on simulation platform\n");
 296                 ret = arcpgu_drm_sim_init(drm, connector);
 297                 if (ret < 0)
 298                         return ret;
 299         }
 300
 301         ret = drm_simple_display_pipe_init(drm, &arcpgu->pipe, &arc_pgu_pipe_funcs,
 302                                            arc_pgu_supported_formats,
 303                                            ARRAY_SIZE(arc_pgu_supported_formats),
 304                                            NULL, connector);
 305         if (ret)
 306                 return ret;
 307
 308         if (encoder_node) {
 309                 struct drm_bridge *bridge;
 310
 311                 /* Locate drm bridge from the hdmi encoder DT node */
 312                 bridge = of_drm_find_bridge(encoder_node);
 313                 if (!bridge)
 314                         return -EPROBE_DEFER;
 315
 316                 ret = drm_simple_display_pipe_attach_bridge(&arcpgu->pipe, bridge);
 317                 if (ret)
 318                         return ret;
 319         }
 320
 321         drm_mode_config_reset(drm);
 322         drm_kms_helper_poll_init(drm);
 323
 324         platform_set_drvdata(pdev, drm);
 325         return 0;
 326 }
 327
 328 static int arcpgu_unload(struct drm_device *drm)
 329 {
 330         drm_kms_helper_poll_fini(drm);
 331         drm_atomic_helper_shutdown(drm);
 332
 333         return 0;
 334 }
 335
 336 #ifdef CONFIG_DEBUG_FS
 337 static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
 338 {
 339         struct drm_info_node *node = (struct drm_info_node *)m->private;
 340         struct drm_device *drm = node->minor->dev;
 341         struct arcpgu_drm_private *arcpgu = dev_to_arcpgu(drm);
 342         unsigned long clkrate = clk_get_rate(arcpgu->clk);
 343         unsigned long mode_clock = arcpgu->pipe.crtc.mode.crtc_clock * 1000;
 344
 345         seq_printf(m, "hw  : %lu\n", clkrate);
 346         seq_printf(m, "mode: %lu\n", mode_clock);
 347         return 0;
 348 }
 349
 350 static struct drm_info_list arcpgu_debugfs_list[] = {
 351         { "clocks", arcpgu_show_pxlclock, 0 },
 352 };
 353
 354 static void arcpgu_debugfs_init(struct drm_minor *minor)
 355 {
 356         drm_debugfs_create_files(arcpgu_debugfs_list,
 357                                  ARRAY_SIZE(arcpgu_debugfs_list),
 358                                  minor->debugfs_root, minor);
 359 }
 360 #endif
 361
 362 static const struct drm_driver arcpgu_drm_driver = {
 363         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 364         .name = "arcpgu",
 365         .desc = "ARC PGU Controller",
 366         .date = "20160219",
 367         .major = 1,
 368         .minor = 0,
 369         .patchlevel = 0,
 370         .fops = &arcpgu_drm_ops,
 371         DRM_GEM_CMA_DRIVER_OPS,
 372 #ifdef CONFIG_DEBUG_FS
 373         .debugfs_init = arcpgu_debugfs_init,
 374 #endif
 375 };
 376
 377 static int arcpgu_probe(struct platform_device *pdev)
 378 {
 379         struct arcpgu_drm_private *arcpgu;
 380         int ret;
 381
 382         arcpgu = devm_drm_dev_alloc(&pdev->dev, &arcpgu_drm_driver,
 383                                     struct arcpgu_drm_private, drm);
 384         if (IS_ERR(arcpgu))
 385                 return PTR_ERR(arcpgu);
 386
 387         ret = arcpgu_load(arcpgu);
 388         if (ret)
 389                 return ret;
 390
 391         ret = drm_dev_register(&arcpgu->drm, 0);
 392         if (ret)
 393                 goto err_unload;
 394
 395         drm_fbdev_generic_setup(&arcpgu->drm, 16);
 396
 397         return 0;
 398
 399 err_unload:
 400         arcpgu_unload(&arcpgu->drm);
 401
 402         return ret;
 403 }
 404
 405 static int arcpgu_remove(struct platform_device *pdev)
 406 {
 407         struct drm_device *drm = platform_get_drvdata(pdev);
 408
 409         drm_dev_unregister(drm);
 410         arcpgu_unload(drm);
 411
 412         return 0;
 413 }
 414
 415 static const struct of_device_id arcpgu_of_table[] = {
 416         {.compatible = "snps,arcpgu"},
 417         {}
 418 };
 419
 420 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 421
 422 static struct platform_driver arcpgu_platform_driver = {
 423         .probe = arcpgu_probe,
 424         .remove = arcpgu_remove,
 425         .driver = {
 426                    .name = "arcpgu",
 427                    .of_match_table = arcpgu_of_table,
 428                    },
 429 };
 430
 431 drm_module_platform_driver(arcpgu_platform_driver);
 432
 433 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 434 MODULE_DESCRIPTION("ARC PGU DRM driver");
 435 MODULE_LICENSE("GPL");