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 48 #include <drm/drm_atomic_helper.h> 49 #include <drm/drm_bridge.h> 50 #include <drm/drm_drv.h> 51 #include <drm/drm_fbdev_dma.h> 52 #include <drm/drm_fourcc.h> 53 #include <drm/drm_gem_dma_helper.h> 54 #include <drm/drm_gem_framebuffer_helper.h> 55 #include <drm/drm_of.h> 56 #include <drm/drm_panel.h> 57 #include <drm/drm_probe_helper.h> 58 #include <drm/drm_vblank.h> 59 60 #include "pl111_drm.h" 61 #include "pl111_versatile.h" 62 #include "pl111_nomadik.h" 63 64 #define DRIVER_DESC "DRM module for PL111" 65 66 static const struct drm_mode_config_funcs mode_config_funcs = { 67 .fb_create = drm_gem_fb_create, 68 .atomic_check = drm_atomic_helper_check, 69 .atomic_commit = drm_atomic_helper_commit, 70 }; 71 72 static int pl111_modeset_init(struct drm_device *dev) 73 { 74 struct drm_mode_config *mode_config; 75 struct pl111_drm_dev_private *priv = dev->dev_private; 76 struct device_node *np = dev->dev->of_node; 77 struct device_node *remote; 78 struct drm_panel *panel = NULL; 79 struct drm_bridge *bridge = NULL; 80 bool defer = false; 81 int ret; 82 int i; 83 84 ret = drmm_mode_config_init(dev); 85 if (ret) 86 return ret; 87 88 mode_config = &dev->mode_config; 89 mode_config->funcs = &mode_config_funcs; 90 mode_config->min_width = 1; 91 mode_config->max_width = 1024; 92 mode_config->min_height = 1; 93 mode_config->max_height = 768; 94 95 i = 0; 96 for_each_endpoint_of_node(np, remote) { 97 struct drm_panel *tmp_panel; 98 struct drm_bridge *tmp_bridge; 99 100 dev_dbg(dev->dev, "checking endpoint %d\n", i); 101 102 ret = drm_of_find_panel_or_bridge(dev->dev->of_node, 103 0, i, 104 &tmp_panel, 105 &tmp_bridge); 106 if (ret) { 107 if (ret == -EPROBE_DEFER) { 108 /* 109 * Something deferred, but that is often just 110 * another way of saying -ENODEV, but let's 111 * cast a vote for later deferral. 112 */ 113 defer = true; 114 } else if (ret != -ENODEV) { 115 /* Continue, maybe something else is working */ 116 dev_err(dev->dev, 117 "endpoint %d returns %d\n", i, ret); 118 } 119 } 120 121 if (tmp_panel) { 122 dev_info(dev->dev, 123 "found panel on endpoint %d\n", i); 124 panel = tmp_panel; 125 } 126 if (tmp_bridge) { 127 dev_info(dev->dev, 128 "found bridge on endpoint %d\n", i); 129 bridge = tmp_bridge; 130 } 131 132 i++; 133 } 134 135 /* 136 * If we can't find neither panel nor bridge on any of the 137 * endpoints, and any of them retured -EPROBE_DEFER, then 138 * let's defer this driver too. 139 */ 140 if ((!panel && !bridge) && defer) 141 return -EPROBE_DEFER; 142 143 if (panel) { 144 bridge = drm_panel_bridge_add_typed(panel, 145 DRM_MODE_CONNECTOR_Unknown); 146 if (IS_ERR(bridge)) { 147 ret = PTR_ERR(bridge); 148 goto finish; 149 } 150 } else if (bridge) { 151 dev_info(dev->dev, "Using non-panel bridge\n"); 152 } else { 153 dev_err(dev->dev, "No bridge, exiting\n"); 154 return -ENODEV; 155 } 156 157 priv->bridge = bridge; 158 if (panel) { 159 priv->panel = panel; 160 priv->connector = drm_panel_bridge_connector(bridge); 161 } 162 163 ret = pl111_display_init(dev); 164 if (ret != 0) { 165 dev_err(dev->dev, "Failed to init display\n"); 166 goto out_bridge; 167 } 168 169 ret = drm_simple_display_pipe_attach_bridge(&priv->pipe, 170 bridge); 171 if (ret) 172 return ret; 173 174 if (!priv->variant->broken_vblank) { 175 ret = drm_vblank_init(dev, 1); 176 if (ret != 0) { 177 dev_err(dev->dev, "Failed to init vblank\n"); 178 goto out_bridge; 179 } 180 } 181 182 drm_mode_config_reset(dev); 183 184 drm_kms_helper_poll_init(dev); 185 186 goto finish; 187 188 out_bridge: 189 if (panel) 190 drm_panel_bridge_remove(bridge); 191 finish: 192 return ret; 193 } 194 195 static struct drm_gem_object * 196 pl111_gem_import_sg_table(struct drm_device *dev, 197 struct dma_buf_attachment *attach, 198 struct sg_table *sgt) 199 { 200 struct pl111_drm_dev_private *priv = dev->dev_private; 201 202 /* 203 * When using device-specific reserved memory we can't import 204 * DMA buffers: those are passed by reference in any global 205 * memory and we can only handle a specific range of memory. 206 */ 207 if (priv->use_device_memory) 208 return ERR_PTR(-EINVAL); 209 210 return drm_gem_dma_prime_import_sg_table(dev, attach, sgt); 211 } 212 213 DEFINE_DRM_GEM_DMA_FOPS(drm_fops); 214 215 static const struct drm_driver pl111_drm_driver = { 216 .driver_features = 217 DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 218 .ioctls = NULL, 219 .fops = &drm_fops, 220 .name = "pl111", 221 .desc = DRIVER_DESC, 222 .date = "20170317", 223 .major = 1, 224 .minor = 0, 225 .patchlevel = 0, 226 .dumb_create = drm_gem_dma_dumb_create, 227 .gem_prime_import_sg_table = pl111_gem_import_sg_table, 228 229 #if defined(CONFIG_DEBUG_FS) 230 .debugfs_init = pl111_debugfs_init, 231 #endif 232 }; 233 234 static int pl111_amba_probe(struct amba_device *amba_dev, 235 const struct amba_id *id) 236 { 237 struct device *dev = &amba_dev->dev; 238 struct pl111_drm_dev_private *priv; 239 const struct pl111_variant_data *variant = id->data; 240 struct drm_device *drm; 241 int ret; 242 243 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 244 if (!priv) 245 return -ENOMEM; 246 247 drm = drm_dev_alloc(&pl111_drm_driver, dev); 248 if (IS_ERR(drm)) 249 return PTR_ERR(drm); 250 amba_set_drvdata(amba_dev, drm); 251 priv->drm = drm; 252 drm->dev_private = priv; 253 priv->variant = variant; 254 255 ret = of_reserved_mem_device_init(dev); 256 if (!ret) { 257 dev_info(dev, "using device-specific reserved memory\n"); 258 priv->use_device_memory = true; 259 } 260 261 if (of_property_read_u32(dev->of_node, "max-memory-bandwidth", 262 &priv->memory_bw)) { 263 dev_info(dev, "no max memory bandwidth specified, assume unlimited\n"); 264 priv->memory_bw = 0; 265 } 266 267 /* The two main variants swap this register */ 268 if (variant->is_pl110 || variant->is_lcdc) { 269 priv->ienb = CLCD_PL110_IENB; 270 priv->ctrl = CLCD_PL110_CNTL; 271 } else { 272 priv->ienb = CLCD_PL111_IENB; 273 priv->ctrl = CLCD_PL111_CNTL; 274 } 275 276 priv->regs = devm_ioremap_resource(dev, &amba_dev->res); 277 if (IS_ERR(priv->regs)) { 278 dev_err(dev, "%s failed mmio\n", __func__); 279 ret = PTR_ERR(priv->regs); 280 goto dev_put; 281 } 282 283 /* This may override some variant settings */ 284 ret = pl111_versatile_init(dev, priv); 285 if (ret) 286 goto dev_put; 287 288 pl111_nomadik_init(dev); 289 290 /* turn off interrupts before requesting the irq */ 291 writel(0, priv->regs + priv->ienb); 292 293 ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0, 294 variant->name, priv); 295 if (ret != 0) { 296 dev_err(dev, "%s failed irq %d\n", __func__, ret); 297 return ret; 298 } 299 300 ret = pl111_modeset_init(drm); 301 if (ret != 0) 302 goto dev_put; 303 304 ret = drm_dev_register(drm, 0); 305 if (ret < 0) 306 goto dev_put; 307 308 drm_fbdev_dma_setup(drm, priv->variant->fb_depth); 309 310 return 0; 311 312 dev_put: 313 drm_dev_put(drm); 314 of_reserved_mem_device_release(dev); 315 316 return ret; 317 } 318 319 static void pl111_amba_remove(struct amba_device *amba_dev) 320 { 321 struct device *dev = &amba_dev->dev; 322 struct drm_device *drm = amba_get_drvdata(amba_dev); 323 struct pl111_drm_dev_private *priv = drm->dev_private; 324 325 drm_dev_unregister(drm); 326 if (priv->panel) 327 drm_panel_bridge_remove(priv->bridge); 328 drm_dev_put(drm); 329 of_reserved_mem_device_release(dev); 330 } 331 332 /* 333 * This early variant lacks the 565 and 444 pixel formats. 334 */ 335 static const u32 pl110_pixel_formats[] = { 336 DRM_FORMAT_ABGR8888, 337 DRM_FORMAT_XBGR8888, 338 DRM_FORMAT_ARGB8888, 339 DRM_FORMAT_XRGB8888, 340 DRM_FORMAT_ABGR1555, 341 DRM_FORMAT_XBGR1555, 342 DRM_FORMAT_ARGB1555, 343 DRM_FORMAT_XRGB1555, 344 }; 345 346 static const struct pl111_variant_data pl110_variant = { 347 .name = "PL110", 348 .is_pl110 = true, 349 .formats = pl110_pixel_formats, 350 .nformats = ARRAY_SIZE(pl110_pixel_formats), 351 .fb_depth = 16, 352 }; 353 354 /* RealView, Versatile Express etc use this modern variant */ 355 static const u32 pl111_pixel_formats[] = { 356 DRM_FORMAT_ABGR8888, 357 DRM_FORMAT_XBGR8888, 358 DRM_FORMAT_ARGB8888, 359 DRM_FORMAT_XRGB8888, 360 DRM_FORMAT_BGR565, 361 DRM_FORMAT_RGB565, 362 DRM_FORMAT_ABGR1555, 363 DRM_FORMAT_XBGR1555, 364 DRM_FORMAT_ARGB1555, 365 DRM_FORMAT_XRGB1555, 366 DRM_FORMAT_ABGR4444, 367 DRM_FORMAT_XBGR4444, 368 DRM_FORMAT_ARGB4444, 369 DRM_FORMAT_XRGB4444, 370 }; 371 372 static const struct pl111_variant_data pl111_variant = { 373 .name = "PL111", 374 .formats = pl111_pixel_formats, 375 .nformats = ARRAY_SIZE(pl111_pixel_formats), 376 .fb_depth = 32, 377 }; 378 379 static const u32 pl110_nomadik_pixel_formats[] = { 380 DRM_FORMAT_RGB888, 381 DRM_FORMAT_BGR888, 382 DRM_FORMAT_ABGR8888, 383 DRM_FORMAT_XBGR8888, 384 DRM_FORMAT_ARGB8888, 385 DRM_FORMAT_XRGB8888, 386 DRM_FORMAT_BGR565, 387 DRM_FORMAT_RGB565, 388 DRM_FORMAT_ABGR1555, 389 DRM_FORMAT_XBGR1555, 390 DRM_FORMAT_ARGB1555, 391 DRM_FORMAT_XRGB1555, 392 DRM_FORMAT_ABGR4444, 393 DRM_FORMAT_XBGR4444, 394 DRM_FORMAT_ARGB4444, 395 DRM_FORMAT_XRGB4444, 396 }; 397 398 static const struct pl111_variant_data pl110_nomadik_variant = { 399 .name = "LCDC (PL110 Nomadik)", 400 .formats = pl110_nomadik_pixel_formats, 401 .nformats = ARRAY_SIZE(pl110_nomadik_pixel_formats), 402 .is_lcdc = true, 403 .st_bitmux_control = true, 404 .broken_vblank = true, 405 .fb_depth = 16, 406 }; 407 408 static const struct amba_id pl111_id_table[] = { 409 { 410 .id = 0x00041110, 411 .mask = 0x000fffff, 412 .data = (void *)&pl110_variant, 413 }, 414 { 415 .id = 0x00180110, 416 .mask = 0x00fffffe, 417 .data = (void *)&pl110_nomadik_variant, 418 }, 419 { 420 .id = 0x00041111, 421 .mask = 0x000fffff, 422 .data = (void *)&pl111_variant, 423 }, 424 {0, 0}, 425 }; 426 MODULE_DEVICE_TABLE(amba, pl111_id_table); 427 428 static struct amba_driver pl111_amba_driver __maybe_unused = { 429 .drv = { 430 .name = "drm-clcd-pl111", 431 }, 432 .probe = pl111_amba_probe, 433 .remove = pl111_amba_remove, 434 .id_table = pl111_id_table, 435 }; 436 437 #ifdef CONFIG_ARM_AMBA 438 module_amba_driver(pl111_amba_driver); 439 #endif 440 441 MODULE_DESCRIPTION(DRIVER_DESC); 442 MODULE_AUTHOR("ARM Ltd."); 443 MODULE_LICENSE("GPL"); 444