drivers/gpu/drm/pl111/pl111_drv.c

   1 /*
   2  * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
   3  *
   4  * Parts of this file were based on sources as follows:
   5  *
   6  * Copyright (c) 2006-2008 Intel Corporation
   7  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   8  * Copyright (C) 2011 Texas Instruments
   9  *
  10  * This program is free software and is provided to you under the terms of the
  11  * GNU General Public License version 2 as published by the Free Software
  12  * Foundation, and any use by you of this program is subject to the terms of
  13  * such GNU licence.
  14  *
  15  */
  16
  17 /**
  18  * DOC: ARM PrimeCell PL111 CLCD Driver
  19  *
  20  * The PL111 is a simple LCD controller that can support TFT and STN
  21  * displays.  This driver exposes a standard KMS interface for them.
  22  *
  23  * This driver uses the same Device Tree binding as the fbdev CLCD
  24  * driver.  While the fbdev driver supports panels that may be
  25  * connected to the CLCD internally to the CLCD driver, in DRM the
  26  * panels get split out to drivers/gpu/drm/panels/.  This means that,
  27  * in converting from using fbdev to using DRM, you also need to write
  28  * a panel driver (which may be as simple as an entry in
  29  * panel-simple.c).
  30  *
  31  * The driver currently doesn't expose the cursor.  The DRM API for
  32  * cursors requires support for 64x64 ARGB8888 cursor images, while
  33  * the hardware can only support 64x64 monochrome with masking
  34  * cursors.  While one could imagine trying to hack something together
  35  * to look at the ARGB8888 and program reasonable in monochrome, we
  36  * just don't expose the cursor at all instead, and leave cursor
  37  * support to the X11 software cursor layer.
  38  *
  39  * TODO:
  40  *
  41  * - Fix race between setting plane base address and getting IRQ for
  42  *   vsync firing the pageflip completion.
  43  *
  44  * - Use the "max-memory-bandwidth" DT property to filter the
  45  *   supported formats.
  46  *
  47  * - Read back hardware state at boot to skip reprogramming the
  48  *   hardware when doing a no-op modeset.
  49  *
  50  * - Use the CLKSEL bit to support switching between the two external
  51  *   clock parents.
  52  */
  53
  54 #include <linux/amba/bus.h>
  55 #include <linux/amba/clcd-regs.h>
  56 #include <linux/version.h>
  57 #include <linux/shmem_fs.h>
  58 #include <linux/dma-buf.h>
  59 #include <linux/module.h>
  60 #include <linux/slab.h>
  61 #include <linux/of.h>
  62 #include <linux/of_graph.h>
  63
  64 #include <drm/drmP.h>
  65 #include <drm/drm_atomic_helper.h>
  66 #include <drm/drm_crtc_helper.h>
  67 #include <drm/drm_gem_cma_helper.h>
  68 #include <drm/drm_gem_framebuffer_helper.h>
  69 #include <drm/drm_fb_helper.h>
  70 #include <drm/drm_fb_cma_helper.h>
  71 #include <drm/drm_of.h>
  72 #include <drm/drm_bridge.h>
  73 #include <drm/drm_panel.h>
  74
  75 #include "pl111_drm.h"
  76 #include "pl111_versatile.h"
  77
  78 #define DRIVER_DESC      "DRM module for PL111"
  79
  80 static const struct drm_mode_config_funcs mode_config_funcs = {
  81         .fb_create = drm_gem_fb_create,
  82         .atomic_check = drm_atomic_helper_check,
  83         .atomic_commit = drm_atomic_helper_commit,
  84 };
  85
  86 static int pl111_modeset_init(struct drm_device *dev)
  87 {
  88         struct drm_mode_config *mode_config;
  89         struct pl111_drm_dev_private *priv = dev->dev_private;
  90         struct device_node *np = dev->dev->of_node;
  91         struct device_node *remote;
  92         struct drm_panel *panel = NULL;
  93         struct drm_bridge *bridge = NULL;
  94         bool defer = false;
  95         int ret = 0;
  96         int i;
  97
  98         drm_mode_config_init(dev);
  99         mode_config = &dev->mode_config;
 100         mode_config->funcs = &mode_config_funcs;
 101         mode_config->min_width = 1;
 102         mode_config->max_width = 1024;
 103         mode_config->min_height = 1;
 104         mode_config->max_height = 768;
 105
 106         i = 0;
 107         for_each_endpoint_of_node(np, remote) {
 108                 struct drm_panel *tmp_panel;
 109                 struct drm_bridge *tmp_bridge;
 110
 111                 dev_dbg(dev->dev, "checking endpoint %d\n", i);
 112
 113                 ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
 114                                                   0, i,
 115                                                   &tmp_panel,
 116                                                   &tmp_bridge);
 117                 if (ret) {
 118                         if (ret == -EPROBE_DEFER) {
 119                                 /*
 120                                  * Something deferred, but that is often just
 121                                  * another way of saying -ENODEV, but let's
 122                                  * cast a vote for later deferral.
 123                                  */
 124                                 defer = true;
 125                         } else if (ret != -ENODEV) {
 126                                 /* Continue, maybe something else is working */
 127                                 dev_err(dev->dev,
 128                                         "endpoint %d returns %d\n", i, ret);
 129                         }
 130                 }
 131
 132                 if (tmp_panel) {
 133                         dev_info(dev->dev,
 134                                  "found panel on endpoint %d\n", i);
 135                         panel = tmp_panel;
 136                 }
 137                 if (tmp_bridge) {
 138                         dev_info(dev->dev,
 139                                  "found bridge on endpoint %d\n", i);
 140                         bridge = tmp_bridge;
 141                 }
 142
 143                 i++;
 144         }
 145
 146         /*
 147          * If we can't find neither panel nor bridge on any of the
 148          * endpoints, and any of them retured -EPROBE_DEFER, then
 149          * let's defer this driver too.
 150          */
 151         if ((!panel && !bridge) && defer)
 152                 return -EPROBE_DEFER;
 153
 154         if (panel) {
 155                 bridge = drm_panel_bridge_add(panel,
 156                                               DRM_MODE_CONNECTOR_Unknown);
 157                 if (IS_ERR(bridge)) {
 158                         ret = PTR_ERR(bridge);
 159                         goto out_config;
 160                 }
 161         } else if (bridge) {
 162                 dev_info(dev->dev, "Using non-panel bridge\n");
 163         } else {
 164                 dev_err(dev->dev, "No bridge, exiting\n");
 165                 return -ENODEV;
 166         }
 167
 168         priv->bridge = bridge;
 169         if (panel) {
 170                 priv->panel = panel;
 171                 priv->connector = panel->connector;
 172         }
 173
 174         ret = pl111_display_init(dev);
 175         if (ret != 0) {
 176                 dev_err(dev->dev, "Failed to init display\n");
 177                 goto out_bridge;
 178         }
 179
 180         ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
 181                                                     bridge);
 182         if (ret)
 183                 return ret;
 184
 185         if (!priv->variant->broken_vblank) {
 186                 ret = drm_vblank_init(dev, 1);
 187                 if (ret != 0) {
 188                         dev_err(dev->dev, "Failed to init vblank\n");
 189                         goto out_bridge;
 190                 }
 191         }
 192
 193         drm_mode_config_reset(dev);
 194
 195         drm_fb_cma_fbdev_init(dev, 32, 0);
 196
 197         drm_kms_helper_poll_init(dev);
 198
 199         goto finish;
 200
 201 out_bridge:
 202         if (panel)
 203                 drm_panel_bridge_remove(bridge);
 204 out_config:
 205         drm_mode_config_cleanup(dev);
 206 finish:
 207         return ret;
 208 }
 209
 210 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
 211
 212 static struct drm_driver pl111_drm_driver = {
 213         .driver_features =
 214                 DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
 215         .lastclose = drm_fb_helper_lastclose,
 216         .ioctls = NULL,
 217         .fops = &drm_fops,
 218         .name = "pl111",
 219         .desc = DRIVER_DESC,
 220         .date = "20170317",
 221         .major = 1,
 222         .minor = 0,
 223         .patchlevel = 0,
 224         .dumb_create = drm_gem_cma_dumb_create,
 225         .gem_free_object_unlocked = drm_gem_cma_free_object,
 226         .gem_vm_ops = &drm_gem_cma_vm_ops,
 227         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 228         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 229         .gem_prime_import = drm_gem_prime_import,
 230         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 231         .gem_prime_export = drm_gem_prime_export,
 232         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 233
 234 #if defined(CONFIG_DEBUG_FS)
 235         .debugfs_init = pl111_debugfs_init,
 236 #endif
 237 };
 238
 239 static int pl111_amba_probe(struct amba_device *amba_dev,
 240                             const struct amba_id *id)
 241 {
 242         struct device *dev = &amba_dev->dev;
 243         struct pl111_drm_dev_private *priv;
 244         const struct pl111_variant_data *variant = id->data;
 245         struct drm_device *drm;
 246         int ret;
 247
 248         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 249         if (!priv)
 250                 return -ENOMEM;
 251
 252         if (!variant->broken_vblank) {
 253                 pl111_drm_driver.enable_vblank = pl111_enable_vblank;
 254                 pl111_drm_driver.disable_vblank = pl111_disable_vblank;
 255         }
 256
 257         drm = drm_dev_alloc(&pl111_drm_driver, dev);
 258         if (IS_ERR(drm))
 259                 return PTR_ERR(drm);
 260         amba_set_drvdata(amba_dev, drm);
 261         priv->drm = drm;
 262         drm->dev_private = priv;
 263         priv->variant = variant;
 264
 265         /* The two variants swap this register */
 266         if (variant->is_pl110) {
 267                 priv->ienb = CLCD_PL110_IENB;
 268                 priv->ctrl = CLCD_PL110_CNTL;
 269         } else {
 270                 priv->ienb = CLCD_PL111_IENB;
 271                 priv->ctrl = CLCD_PL111_CNTL;
 272         }
 273
 274         priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
 275         if (IS_ERR(priv->regs)) {
 276                 dev_err(dev, "%s failed mmio\n", __func__);
 277                 return PTR_ERR(priv->regs);
 278         }
 279
 280         /* This may override some variant settings */
 281         ret = pl111_versatile_init(dev, priv);
 282         if (ret)
 283                 goto dev_unref;
 284
 285         /* turn off interrupts before requesting the irq */
 286         writel(0, priv->regs + priv->ienb);
 287
 288         ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
 289                                variant->name, priv);
 290         if (ret != 0) {
 291                 dev_err(dev, "%s failed irq %d\n", __func__, ret);
 292                 return ret;
 293         }
 294
 295         ret = pl111_modeset_init(drm);
 296         if (ret != 0)
 297                 goto dev_unref;
 298
 299         ret = drm_dev_register(drm, 0);
 300         if (ret < 0)
 301                 goto dev_unref;
 302
 303         return 0;
 304
 305 dev_unref:
 306         drm_dev_unref(drm);
 307         return ret;
 308 }
 309
 310 static int pl111_amba_remove(struct amba_device *amba_dev)
 311 {
 312         struct drm_device *drm = amba_get_drvdata(amba_dev);
 313         struct pl111_drm_dev_private *priv = drm->dev_private;
 314
 315         drm_dev_unregister(drm);
 316         drm_fb_cma_fbdev_fini(drm);
 317         if (priv->panel)
 318                 drm_panel_bridge_remove(priv->bridge);
 319         drm_mode_config_cleanup(drm);
 320         drm_dev_unref(drm);
 321
 322         return 0;
 323 }
 324
 325 /*
 326  * This early variant lacks the 565 and 444 pixel formats.
 327  */
 328 static const u32 pl110_pixel_formats[] = {
 329         DRM_FORMAT_ABGR8888,
 330         DRM_FORMAT_XBGR8888,
 331         DRM_FORMAT_ARGB8888,
 332         DRM_FORMAT_XRGB8888,
 333         DRM_FORMAT_ABGR1555,
 334         DRM_FORMAT_XBGR1555,
 335         DRM_FORMAT_ARGB1555,
 336         DRM_FORMAT_XRGB1555,
 337 };
 338
 339 static const struct pl111_variant_data pl110_variant = {
 340         .name = "PL110",
 341         .is_pl110 = true,
 342         .formats = pl110_pixel_formats,
 343         .nformats = ARRAY_SIZE(pl110_pixel_formats),
 344 };
 345
 346 /* RealView, Versatile Express etc use this modern variant */
 347 static const u32 pl111_pixel_formats[] = {
 348         DRM_FORMAT_ABGR8888,
 349         DRM_FORMAT_XBGR8888,
 350         DRM_FORMAT_ARGB8888,
 351         DRM_FORMAT_XRGB8888,
 352         DRM_FORMAT_BGR565,
 353         DRM_FORMAT_RGB565,
 354         DRM_FORMAT_ABGR1555,
 355         DRM_FORMAT_XBGR1555,
 356         DRM_FORMAT_ARGB1555,
 357         DRM_FORMAT_XRGB1555,
 358         DRM_FORMAT_ABGR4444,
 359         DRM_FORMAT_XBGR4444,
 360         DRM_FORMAT_ARGB4444,
 361         DRM_FORMAT_XRGB4444,
 362 };
 363
 364 static const struct pl111_variant_data pl111_variant = {
 365         .name = "PL111",
 366         .formats = pl111_pixel_formats,
 367         .nformats = ARRAY_SIZE(pl111_pixel_formats),
 368 };
 369
 370 static const struct amba_id pl111_id_table[] = {
 371         {
 372                 .id = 0x00041110,
 373                 .mask = 0x000fffff,
 374                 .data = (void*)&pl110_variant,
 375         },
 376         {
 377                 .id = 0x00041111,
 378                 .mask = 0x000fffff,
 379                 .data = (void*)&pl111_variant,
 380         },
 381         {0, 0},
 382 };
 383
 384 static struct amba_driver pl111_amba_driver __maybe_unused = {
 385         .drv = {
 386                 .name = "drm-clcd-pl111",
 387         },
 388         .probe = pl111_amba_probe,
 389         .remove = pl111_amba_remove,
 390         .id_table = pl111_id_table,
 391 };
 392
 393 #ifdef CONFIG_ARM_AMBA
 394 module_amba_driver(pl111_amba_driver);
 395 #endif
 396
 397 MODULE_DESCRIPTION(DRIVER_DESC);
 398 MODULE_AUTHOR("ARM Ltd.");
 399 MODULE_LICENSE("GPL");