drivers/gpu/drm/pl111/pl111_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
   4  *
   5  * Parts of this file were based on sources as follows:
   6  *
   7  * Copyright (c) 2006-2008 Intel Corporation
   8  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   9  * Copyright (C) 2011 Texas Instruments
  10  */
  11
  12 /**
  13  * DOC: ARM PrimeCell PL110 and PL111 CLCD Driver
  14  *
  15  * The PL110/PL111 is a simple LCD controller that can support TFT
  16  * and STN displays. This driver exposes a standard KMS interface
  17  * for them.
  18  *
  19  * The driver currently doesn't expose the cursor.  The DRM API for
  20  * cursors requires support for 64x64 ARGB8888 cursor images, while
  21  * the hardware can only support 64x64 monochrome with masking
  22  * cursors.  While one could imagine trying to hack something together
  23  * to look at the ARGB8888 and program reasonable in monochrome, we
  24  * just don't expose the cursor at all instead, and leave cursor
  25  * support to the application software cursor layer.
  26  *
  27  * TODO:
  28  *
  29  * - Fix race between setting plane base address and getting IRQ for
  30  *   vsync firing the pageflip completion.
  31  *
  32  * - Read back hardware state at boot to skip reprogramming the
  33  *   hardware when doing a no-op modeset.
  34  *
  35  * - Use the CLKSEL bit to support switching between the two external
  36  *   clock parents.
  37  */
  38
  39 #include <linux/amba/bus.h>
  40 #include <linux/dma-buf.h>
  41 #include <linux/module.h>
  42 #include <linux/of.h>
  43 #include <linux/of_graph.h>
  44 #include <linux/of_reserved_mem.h>
  45 #include <linux/shmem_fs.h>
  46 #include <linux/slab.h>
  47 #include <linux/version.h>
  48
  49 #include <drm/drm_atomic_helper.h>
  50 #include <drm/drm_bridge.h>
  51 #include <drm/drm_drv.h>
  52 #include <drm/drm_fb_cma_helper.h>
  53 #include <drm/drm_fb_helper.h>
  54 #include <drm/drm_gem_cma_helper.h>
  55 #include <drm/drm_gem_framebuffer_helper.h>
  56 #include <drm/drm_of.h>
  57 #include <drm/drm_panel.h>
  58 #include <drm/drm_probe_helper.h>
  59 #include <drm/drm_vblank.h>
  60
  61 #include "pl111_drm.h"
  62 #include "pl111_versatile.h"
  63 #include "pl111_nomadik.h"
  64
  65 #define DRIVER_DESC      "DRM module for PL111"
  66
  67 static const struct drm_mode_config_funcs mode_config_funcs = {
  68         .fb_create = drm_gem_fb_create,
  69         .atomic_check = drm_atomic_helper_check,
  70         .atomic_commit = drm_atomic_helper_commit,
  71 };
  72
  73 static int pl111_modeset_init(struct drm_device *dev)
  74 {
  75         struct drm_mode_config *mode_config;
  76         struct pl111_drm_dev_private *priv = dev->dev_private;
  77         struct device_node *np = dev->dev->of_node;
  78         struct device_node *remote;
  79         struct drm_panel *panel = NULL;
  80         struct drm_bridge *bridge = NULL;
  81         bool defer = false;
  82         int ret;
  83         int i;
  84
  85         ret = drmm_mode_config_init(dev);
  86         if (ret)
  87                 return ret;
  88
  89         mode_config = &dev->mode_config;
  90         mode_config->funcs = &mode_config_funcs;
  91         mode_config->min_width = 1;
  92         mode_config->max_width = 1024;
  93         mode_config->min_height = 1;
  94         mode_config->max_height = 768;
  95
  96         i = 0;
  97         for_each_endpoint_of_node(np, remote) {
  98                 struct drm_panel *tmp_panel;
  99                 struct drm_bridge *tmp_bridge;
 100
 101                 dev_dbg(dev->dev, "checking endpoint %d\n", i);
 102
 103                 ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
 104                                                   0, i,
 105                                                   &tmp_panel,
 106                                                   &tmp_bridge);
 107                 if (ret) {
 108                         if (ret == -EPROBE_DEFER) {
 109                                 /*
 110                                  * Something deferred, but that is often just
 111                                  * another way of saying -ENODEV, but let's
 112                                  * cast a vote for later deferral.
 113                                  */
 114                                 defer = true;
 115                         } else if (ret != -ENODEV) {
 116                                 /* Continue, maybe something else is working */
 117                                 dev_err(dev->dev,
 118                                         "endpoint %d returns %d\n", i, ret);
 119                         }
 120                 }
 121
 122                 if (tmp_panel) {
 123                         dev_info(dev->dev,
 124                                  "found panel on endpoint %d\n", i);
 125                         panel = tmp_panel;
 126                 }
 127                 if (tmp_bridge) {
 128                         dev_info(dev->dev,
 129                                  "found bridge on endpoint %d\n", i);
 130                         bridge = tmp_bridge;
 131                 }
 132
 133                 i++;
 134         }
 135
 136         /*
 137          * If we can't find neither panel nor bridge on any of the
 138          * endpoints, and any of them retured -EPROBE_DEFER, then
 139          * let's defer this driver too.
 140          */
 141         if ((!panel && !bridge) && defer)
 142                 return -EPROBE_DEFER;
 143
 144         if (panel) {
 145                 bridge = drm_panel_bridge_add_typed(panel,
 146                                                     DRM_MODE_CONNECTOR_Unknown);
 147                 if (IS_ERR(bridge)) {
 148                         ret = PTR_ERR(bridge);
 149                         goto finish;
 150                 }
 151         } else if (bridge) {
 152                 dev_info(dev->dev, "Using non-panel bridge\n");
 153         } else {
 154                 dev_err(dev->dev, "No bridge, exiting\n");
 155                 return -ENODEV;
 156         }
 157
 158         priv->bridge = bridge;
 159         if (panel) {
 160                 priv->panel = panel;
 161                 priv->connector = drm_panel_bridge_connector(bridge);
 162         }
 163
 164         ret = pl111_display_init(dev);
 165         if (ret != 0) {
 166                 dev_err(dev->dev, "Failed to init display\n");
 167                 goto out_bridge;
 168         }
 169
 170         ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
 171                                                     bridge);
 172         if (ret)
 173                 return ret;
 174
 175         if (!priv->variant->broken_vblank) {
 176                 ret = drm_vblank_init(dev, 1);
 177                 if (ret != 0) {
 178                         dev_err(dev->dev, "Failed to init vblank\n");
 179                         goto out_bridge;
 180                 }
 181         }
 182
 183         drm_mode_config_reset(dev);
 184
 185         drm_kms_helper_poll_init(dev);
 186
 187         goto finish;
 188
 189 out_bridge:
 190         if (panel)
 191                 drm_panel_bridge_remove(bridge);
 192 finish:
 193         return ret;
 194 }
 195
 196 static struct drm_gem_object *
 197 pl111_gem_import_sg_table(struct drm_device *dev,
 198                           struct dma_buf_attachment *attach,
 199                           struct sg_table *sgt)
 200 {
 201         struct pl111_drm_dev_private *priv = dev->dev_private;
 202
 203         /*
 204          * When using device-specific reserved memory we can't import
 205          * DMA buffers: those are passed by reference in any global
 206          * memory and we can only handle a specific range of memory.
 207          */
 208         if (priv->use_device_memory)
 209                 return ERR_PTR(-EINVAL);
 210
 211         return drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
 212 }
 213
 214 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
 215
 216 static const struct drm_driver pl111_drm_driver = {
 217         .driver_features =
 218                 DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 219         .ioctls = NULL,
 220         .fops = &drm_fops,
 221         .name = "pl111",
 222         .desc = DRIVER_DESC,
 223         .date = "20170317",
 224         .major = 1,
 225         .minor = 0,
 226         .patchlevel = 0,
 227         .dumb_create = drm_gem_cma_dumb_create,
 228         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 229         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 230         .gem_prime_import_sg_table = pl111_gem_import_sg_table,
 231         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 232
 233 #if defined(CONFIG_DEBUG_FS)
 234         .debugfs_init = pl111_debugfs_init,
 235 #endif
 236 };
 237
 238 static int pl111_amba_probe(struct amba_device *amba_dev,
 239                             const struct amba_id *id)
 240 {
 241         struct device *dev = &amba_dev->dev;
 242         struct pl111_drm_dev_private *priv;
 243         const struct pl111_variant_data *variant = id->data;
 244         struct drm_device *drm;
 245         int ret;
 246
 247         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 248         if (!priv)
 249                 return -ENOMEM;
 250
 251         drm = drm_dev_alloc(&pl111_drm_driver, dev);
 252         if (IS_ERR(drm))
 253                 return PTR_ERR(drm);
 254         amba_set_drvdata(amba_dev, drm);
 255         priv->drm = drm;
 256         drm->dev_private = priv;
 257         priv->variant = variant;
 258
 259         ret = of_reserved_mem_device_init(dev);
 260         if (!ret) {
 261                 dev_info(dev, "using device-specific reserved memory\n");
 262                 priv->use_device_memory = true;
 263         }
 264
 265         if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
 266                                  &priv->memory_bw)) {
 267                 dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
 268                 priv->memory_bw = 0;
 269         }
 270
 271         /* The two main variants swap this register */
 272         if (variant->is_pl110 || variant->is_lcdc) {
 273                 priv->ienb = CLCD_PL110_IENB;
 274                 priv->ctrl = CLCD_PL110_CNTL;
 275         } else {
 276                 priv->ienb = CLCD_PL111_IENB;
 277                 priv->ctrl = CLCD_PL111_CNTL;
 278         }
 279
 280         priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
 281         if (IS_ERR(priv->regs)) {
 282                 dev_err(dev, "%s failed mmio\n", __func__);
 283                 ret = PTR_ERR(priv->regs);
 284                 goto dev_put;
 285         }
 286
 287         /* This may override some variant settings */
 288         ret = pl111_versatile_init(dev, priv);
 289         if (ret)
 290                 goto dev_put;
 291
 292         pl111_nomadik_init(dev);
 293
 294         /* turn off interrupts before requesting the irq */
 295         writel(0, priv->regs + priv->ienb);
 296
 297         ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
 298                                variant->name, priv);
 299         if (ret != 0) {
 300                 dev_err(dev, "%s failed irq %d\n", __func__, ret);
 301                 return ret;
 302         }
 303
 304         ret = pl111_modeset_init(drm);
 305         if (ret != 0)
 306                 goto dev_put;
 307
 308         ret = drm_dev_register(drm, 0);
 309         if (ret < 0)
 310                 goto dev_put;
 311
 312         drm_fbdev_generic_setup(drm, priv->variant->fb_bpp);
 313
 314         return 0;
 315
 316 dev_put:
 317         drm_dev_put(drm);
 318         of_reserved_mem_device_release(dev);
 319
 320         return ret;
 321 }
 322
 323 static int pl111_amba_remove(struct amba_device *amba_dev)
 324 {
 325         struct device *dev = &amba_dev->dev;
 326         struct drm_device *drm = amba_get_drvdata(amba_dev);
 327         struct pl111_drm_dev_private *priv = drm->dev_private;
 328
 329         drm_dev_unregister(drm);
 330         if (priv->panel)
 331                 drm_panel_bridge_remove(priv->bridge);
 332         drm_dev_put(drm);
 333         of_reserved_mem_device_release(dev);
 334
 335         return 0;
 336 }
 337
 338 /*
 339  * This early variant lacks the 565 and 444 pixel formats.
 340  */
 341 static const u32 pl110_pixel_formats[] = {
 342         DRM_FORMAT_ABGR8888,
 343         DRM_FORMAT_XBGR8888,
 344         DRM_FORMAT_ARGB8888,
 345         DRM_FORMAT_XRGB8888,
 346         DRM_FORMAT_ABGR1555,
 347         DRM_FORMAT_XBGR1555,
 348         DRM_FORMAT_ARGB1555,
 349         DRM_FORMAT_XRGB1555,
 350 };
 351
 352 static const struct pl111_variant_data pl110_variant = {
 353         .name = "PL110",
 354         .is_pl110 = true,
 355         .formats = pl110_pixel_formats,
 356         .nformats = ARRAY_SIZE(pl110_pixel_formats),
 357         .fb_bpp = 16,
 358 };
 359
 360 /* RealView, Versatile Express etc use this modern variant */
 361 static const u32 pl111_pixel_formats[] = {
 362         DRM_FORMAT_ABGR8888,
 363         DRM_FORMAT_XBGR8888,
 364         DRM_FORMAT_ARGB8888,
 365         DRM_FORMAT_XRGB8888,
 366         DRM_FORMAT_BGR565,
 367         DRM_FORMAT_RGB565,
 368         DRM_FORMAT_ABGR1555,
 369         DRM_FORMAT_XBGR1555,
 370         DRM_FORMAT_ARGB1555,
 371         DRM_FORMAT_XRGB1555,
 372         DRM_FORMAT_ABGR4444,
 373         DRM_FORMAT_XBGR4444,
 374         DRM_FORMAT_ARGB4444,
 375         DRM_FORMAT_XRGB4444,
 376 };
 377
 378 static const struct pl111_variant_data pl111_variant = {
 379         .name = "PL111",
 380         .formats = pl111_pixel_formats,
 381         .nformats = ARRAY_SIZE(pl111_pixel_formats),
 382         .fb_bpp = 32,
 383 };
 384
 385 static const u32 pl110_nomadik_pixel_formats[] = {
 386         DRM_FORMAT_RGB888,
 387         DRM_FORMAT_BGR888,
 388         DRM_FORMAT_ABGR8888,
 389         DRM_FORMAT_XBGR8888,
 390         DRM_FORMAT_ARGB8888,
 391         DRM_FORMAT_XRGB8888,
 392         DRM_FORMAT_BGR565,
 393         DRM_FORMAT_RGB565,
 394         DRM_FORMAT_ABGR1555,
 395         DRM_FORMAT_XBGR1555,
 396         DRM_FORMAT_ARGB1555,
 397         DRM_FORMAT_XRGB1555,
 398         DRM_FORMAT_ABGR4444,
 399         DRM_FORMAT_XBGR4444,
 400         DRM_FORMAT_ARGB4444,
 401         DRM_FORMAT_XRGB4444,
 402 };
 403
 404 static const struct pl111_variant_data pl110_nomadik_variant = {
 405         .name = "LCDC (PL110 Nomadik)",
 406         .formats = pl110_nomadik_pixel_formats,
 407         .nformats = ARRAY_SIZE(pl110_nomadik_pixel_formats),
 408         .is_lcdc = true,
 409         .st_bitmux_control = true,
 410         .broken_vblank = true,
 411         .fb_bpp = 16,
 412 };
 413
 414 static const struct amba_id pl111_id_table[] = {
 415         {
 416                 .id = 0x00041110,
 417                 .mask = 0x000fffff,
 418                 .data = (void *)&pl110_variant,
 419         },
 420         {
 421                 .id = 0x00180110,
 422                 .mask = 0x00fffffe,
 423                 .data = (void *)&pl110_nomadik_variant,
 424         },
 425         {
 426                 .id = 0x00041111,
 427                 .mask = 0x000fffff,
 428                 .data = (void *)&pl111_variant,
 429         },
 430         {0, 0},
 431 };
 432 MODULE_DEVICE_TABLE(amba, pl111_id_table);
 433
 434 static struct amba_driver pl111_amba_driver __maybe_unused = {
 435         .drv = {
 436                 .name = "drm-clcd-pl111",
 437         },
 438         .probe = pl111_amba_probe,
 439         .remove = pl111_amba_remove,
 440         .id_table = pl111_id_table,
 441 };
 442
 443 #ifdef CONFIG_ARM_AMBA
 444 module_amba_driver(pl111_amba_driver);
 445 #endif
 446
 447 MODULE_DESCRIPTION(DRIVER_DESC);
 448 MODULE_AUTHOR("ARM Ltd.");
 449 MODULE_LICENSE("GPL");