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
  62 #include <drm/drmP.h>
  63 #include <drm/drm_atomic_helper.h>
  64 #include <drm/drm_crtc_helper.h>
  65 #include <drm/drm_gem_cma_helper.h>
  66 #include <drm/drm_gem_framebuffer_helper.h>
  67 #include <drm/drm_fb_helper.h>
  68 #include <drm/drm_fb_cma_helper.h>
  69 #include <drm/drm_of.h>
  70 #include <drm/drm_bridge.h>
  71 #include <drm/drm_panel.h>
  72
  73 #include "pl111_drm.h"
  74 #include "pl111_versatile.h"
  75
  76 #define DRIVER_DESC      "DRM module for PL111"
  77
  78 static const struct drm_mode_config_funcs mode_config_funcs = {
  79         .fb_create = drm_gem_fb_create,
  80         .atomic_check = drm_atomic_helper_check,
  81         .atomic_commit = drm_atomic_helper_commit,
  82 };
  83
  84 static int pl111_modeset_init(struct drm_device *dev)
  85 {
  86         struct drm_mode_config *mode_config;
  87         struct pl111_drm_dev_private *priv = dev->dev_private;
  88         struct drm_panel *panel;
  89         struct drm_bridge *bridge;
  90         int ret = 0;
  91
  92         drm_mode_config_init(dev);
  93         mode_config = &dev->mode_config;
  94         mode_config->funcs = &mode_config_funcs;
  95         mode_config->min_width = 1;
  96         mode_config->max_width = 1024;
  97         mode_config->min_height = 1;
  98         mode_config->max_height = 768;
  99
 100         ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
 101                                           0, 0, &panel, &bridge);
 102         if (ret && ret != -ENODEV)
 103                 return ret;
 104         if (panel) {
 105                 bridge = drm_panel_bridge_add(panel,
 106                                               DRM_MODE_CONNECTOR_Unknown);
 107                 if (IS_ERR(bridge)) {
 108                         ret = PTR_ERR(bridge);
 109                         goto out_config;
 110                 }
 111                 /*
 112                  * TODO: when we are using a different bridge than a panel
 113                  * (such as a dumb VGA connector) we need to devise a different
 114                  * method to get the connector out of the bridge.
 115                  */
 116         }
 117
 118         ret = pl111_display_init(dev);
 119         if (ret != 0) {
 120                 dev_err(dev->dev, "Failed to init display\n");
 121                 goto out_bridge;
 122         }
 123
 124         ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
 125                                                     bridge);
 126         if (ret)
 127                 return ret;
 128
 129         priv->bridge = bridge;
 130         priv->panel = panel;
 131         priv->connector = panel->connector;
 132
 133         ret = drm_vblank_init(dev, 1);
 134         if (ret != 0) {
 135                 dev_err(dev->dev, "Failed to init vblank\n");
 136                 goto out_bridge;
 137         }
 138
 139         drm_mode_config_reset(dev);
 140
 141         drm_fb_cma_fbdev_init(dev, 32, 0);
 142
 143         drm_kms_helper_poll_init(dev);
 144
 145         goto finish;
 146
 147 out_bridge:
 148         if (panel)
 149                 drm_panel_bridge_remove(bridge);
 150 out_config:
 151         drm_mode_config_cleanup(dev);
 152 finish:
 153         return ret;
 154 }
 155
 156 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
 157
 158 static struct drm_driver pl111_drm_driver = {
 159         .driver_features =
 160                 DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
 161         .lastclose = drm_fb_helper_lastclose,
 162         .ioctls = NULL,
 163         .fops = &drm_fops,
 164         .name = "pl111",
 165         .desc = DRIVER_DESC,
 166         .date = "20170317",
 167         .major = 1,
 168         .minor = 0,
 169         .patchlevel = 0,
 170         .dumb_create = drm_gem_cma_dumb_create,
 171         .gem_free_object_unlocked = drm_gem_cma_free_object,
 172         .gem_vm_ops = &drm_gem_cma_vm_ops,
 173
 174         .enable_vblank = pl111_enable_vblank,
 175         .disable_vblank = pl111_disable_vblank,
 176
 177         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 178         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 179         .gem_prime_import = drm_gem_prime_import,
 180         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 181         .gem_prime_export = drm_gem_prime_export,
 182         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 183
 184 #if defined(CONFIG_DEBUG_FS)
 185         .debugfs_init = pl111_debugfs_init,
 186 #endif
 187 };
 188
 189 static int pl111_amba_probe(struct amba_device *amba_dev,
 190                             const struct amba_id *id)
 191 {
 192         struct device *dev = &amba_dev->dev;
 193         struct pl111_drm_dev_private *priv;
 194         struct pl111_variant_data *variant = id->data;
 195         struct drm_device *drm;
 196         int ret;
 197
 198         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 199         if (!priv)
 200                 return -ENOMEM;
 201
 202         drm = drm_dev_alloc(&pl111_drm_driver, dev);
 203         if (IS_ERR(drm))
 204                 return PTR_ERR(drm);
 205         amba_set_drvdata(amba_dev, drm);
 206         priv->drm = drm;
 207         drm->dev_private = priv;
 208         priv->variant = variant;
 209
 210         /*
 211          * The PL110 and PL111 variants have two registers
 212          * swapped: interrupt enable and control. For this reason
 213          * we use offsets that we can change per variant.
 214          */
 215         if (variant->is_pl110) {
 216                 /*
 217                  * The ARM Versatile boards are even more special:
 218                  * their PrimeCell ID say they are PL110 but the
 219                  * control and interrupt enable registers are anyway
 220                  * swapped to the PL111 order so they are not following
 221                  * the PL110 datasheet.
 222                  */
 223                 if (of_machine_is_compatible("arm,versatile-ab") ||
 224                     of_machine_is_compatible("arm,versatile-pb")) {
 225                         priv->ienb = CLCD_PL111_IENB;
 226                         priv->ctrl = CLCD_PL111_CNTL;
 227                 } else {
 228                         priv->ienb = CLCD_PL110_IENB;
 229                         priv->ctrl = CLCD_PL110_CNTL;
 230                 }
 231         } else {
 232                 priv->ienb = CLCD_PL111_IENB;
 233                 priv->ctrl = CLCD_PL111_CNTL;
 234         }
 235
 236         priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
 237         if (IS_ERR(priv->regs)) {
 238                 dev_err(dev, "%s failed mmio\n", __func__);
 239                 return PTR_ERR(priv->regs);
 240         }
 241
 242         /* turn off interrupts before requesting the irq */
 243         writel(0, priv->regs + priv->ienb);
 244
 245         ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
 246                                variant->name, priv);
 247         if (ret != 0) {
 248                 dev_err(dev, "%s failed irq %d\n", __func__, ret);
 249                 return ret;
 250         }
 251
 252         ret = pl111_versatile_init(dev, priv);
 253         if (ret)
 254                 goto dev_unref;
 255
 256         ret = pl111_modeset_init(drm);
 257         if (ret != 0)
 258                 goto dev_unref;
 259
 260         ret = drm_dev_register(drm, 0);
 261         if (ret < 0)
 262                 goto dev_unref;
 263
 264         return 0;
 265
 266 dev_unref:
 267         drm_dev_unref(drm);
 268         return ret;
 269 }
 270
 271 static int pl111_amba_remove(struct amba_device *amba_dev)
 272 {
 273         struct drm_device *drm = amba_get_drvdata(amba_dev);
 274         struct pl111_drm_dev_private *priv = drm->dev_private;
 275
 276         drm_dev_unregister(drm);
 277         drm_fb_cma_fbdev_fini(drm);
 278         if (priv->panel)
 279                 drm_panel_bridge_remove(priv->bridge);
 280         drm_mode_config_cleanup(drm);
 281         drm_dev_unref(drm);
 282
 283         return 0;
 284 }
 285
 286 /*
 287  * This variant exist in early versions like the ARM Integrator
 288  * and this version lacks the 565 and 444 pixel formats.
 289  */
 290 static const u32 pl110_pixel_formats[] = {
 291         DRM_FORMAT_ABGR8888,
 292         DRM_FORMAT_XBGR8888,
 293         DRM_FORMAT_ARGB8888,
 294         DRM_FORMAT_XRGB8888,
 295         DRM_FORMAT_ABGR1555,
 296         DRM_FORMAT_XBGR1555,
 297         DRM_FORMAT_ARGB1555,
 298         DRM_FORMAT_XRGB1555,
 299 };
 300
 301 static const struct pl111_variant_data pl110_variant = {
 302         .name = "PL110",
 303         .is_pl110 = true,
 304         .formats = pl110_pixel_formats,
 305         .nformats = ARRAY_SIZE(pl110_pixel_formats),
 306 };
 307
 308 /* RealView, Versatile Express etc use this modern variant */
 309 static const u32 pl111_pixel_formats[] = {
 310         DRM_FORMAT_ABGR8888,
 311         DRM_FORMAT_XBGR8888,
 312         DRM_FORMAT_ARGB8888,
 313         DRM_FORMAT_XRGB8888,
 314         DRM_FORMAT_BGR565,
 315         DRM_FORMAT_RGB565,
 316         DRM_FORMAT_ABGR1555,
 317         DRM_FORMAT_XBGR1555,
 318         DRM_FORMAT_ARGB1555,
 319         DRM_FORMAT_XRGB1555,
 320         DRM_FORMAT_ABGR4444,
 321         DRM_FORMAT_XBGR4444,
 322         DRM_FORMAT_ARGB4444,
 323         DRM_FORMAT_XRGB4444,
 324 };
 325
 326 static const struct pl111_variant_data pl111_variant = {
 327         .name = "PL111",
 328         .formats = pl111_pixel_formats,
 329         .nformats = ARRAY_SIZE(pl111_pixel_formats),
 330 };
 331
 332 static const struct amba_id pl111_id_table[] = {
 333         {
 334                 .id = 0x00041110,
 335                 .mask = 0x000fffff,
 336                 .data = (void*)&pl110_variant,
 337         },
 338         {
 339                 .id = 0x00041111,
 340                 .mask = 0x000fffff,
 341                 .data = (void*)&pl111_variant,
 342         },
 343         {0, 0},
 344 };
 345
 346 static struct amba_driver pl111_amba_driver __maybe_unused = {
 347         .drv = {
 348                 .name = "drm-clcd-pl111",
 349         },
 350         .probe = pl111_amba_probe,
 351         .remove = pl111_amba_remove,
 352         .id_table = pl111_id_table,
 353 };
 354
 355 #ifdef CONFIG_ARM_AMBA
 356 module_amba_driver(pl111_amba_driver);
 357 #endif
 358
 359 MODULE_DESCRIPTION(DRIVER_DESC);
 360 MODULE_AUTHOR("ARM Ltd.");
 361 MODULE_LICENSE("GPL");