1 // SPDX-License-Identifier: GPL-2.0-only
3 * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
5 * Parts of this file were based on sources as follows:
7 * Copyright (c) 2006-2008 Intel Corporation
8 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
9 * Copyright (C) 2011 Texas Instruments
13 * DOC: ARM PrimeCell PL110 and PL111 CLCD Driver
15 * The PL110/PL111 is a simple LCD controller that can support TFT
16 * and STN displays. This driver exposes a standard KMS interface
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.
29 * - Fix race between setting plane base address and getting IRQ for
30 * vsync firing the pageflip completion.
32 * - Read back hardware state at boot to skip reprogramming the
33 * hardware when doing a no-op modeset.
35 * - Use the CLKSEL bit to support switching between the two external
39 #include <linux/amba/bus.h>
40 #include <linux/dma-buf.h>
41 #include <linux/module.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>
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>
61 #include "pl111_drm.h"
62 #include "pl111_versatile.h"
63 #include "pl111_nomadik.h"
65 #define DRIVER_DESC "DRM module for PL111"
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,
73 static int pl111_modeset_init(struct drm_device *dev)
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;
85 ret = drmm_mode_config_init(dev);
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;
97 for_each_endpoint_of_node(np, remote) {
98 struct drm_panel *tmp_panel;
99 struct drm_bridge *tmp_bridge;
101 dev_dbg(dev->dev, "checking endpoint %d\n", i);
103 ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
108 if (ret == -EPROBE_DEFER) {
110 * Something deferred, but that is often just
111 * another way of saying -ENODEV, but let's
112 * cast a vote for later deferral.
115 } else if (ret != -ENODEV) {
116 /* Continue, maybe something else is working */
118 "endpoint %d returns %d\n", i, ret);
124 "found panel on endpoint %d\n", i);
129 "found bridge on endpoint %d\n", i);
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.
141 if ((!panel && !bridge) && defer)
142 return -EPROBE_DEFER;
145 bridge = drm_panel_bridge_add_typed(panel,
146 DRM_MODE_CONNECTOR_Unknown);
147 if (IS_ERR(bridge)) {
148 ret = PTR_ERR(bridge);
152 dev_info(dev->dev, "Using non-panel bridge\n");
154 dev_err(dev->dev, "No bridge, exiting\n");
158 priv->bridge = bridge;
161 priv->connector = drm_panel_bridge_connector(bridge);
164 ret = pl111_display_init(dev);
166 dev_err(dev->dev, "Failed to init display\n");
170 ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
175 if (!priv->variant->broken_vblank) {
176 ret = drm_vblank_init(dev, 1);
178 dev_err(dev->dev, "Failed to init vblank\n");
183 drm_mode_config_reset(dev);
185 drm_kms_helper_poll_init(dev);
191 drm_panel_bridge_remove(bridge);
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)
201 struct pl111_drm_dev_private *priv = dev->dev_private;
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.
208 if (priv->use_device_memory)
209 return ERR_PTR(-EINVAL);
211 return drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
214 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
216 static struct drm_driver pl111_drm_driver = {
218 DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
227 .dumb_create = drm_gem_cma_dumb_create,
228 .gem_free_object_unlocked = drm_gem_cma_free_object,
229 .gem_vm_ops = &drm_gem_cma_vm_ops,
230 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
231 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
232 .gem_prime_import_sg_table = pl111_gem_import_sg_table,
233 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
234 .gem_prime_mmap = drm_gem_cma_prime_mmap,
235 .gem_prime_vmap = drm_gem_cma_prime_vmap,
237 #if defined(CONFIG_DEBUG_FS)
238 .debugfs_init = pl111_debugfs_init,
242 static int pl111_amba_probe(struct amba_device *amba_dev,
243 const struct amba_id *id)
245 struct device *dev = &amba_dev->dev;
246 struct pl111_drm_dev_private *priv;
247 const struct pl111_variant_data *variant = id->data;
248 struct drm_device *drm;
251 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
255 drm = drm_dev_alloc(&pl111_drm_driver, dev);
258 amba_set_drvdata(amba_dev, drm);
260 drm->dev_private = priv;
261 priv->variant = variant;
263 ret = of_reserved_mem_device_init(dev);
265 dev_info(dev, "using device-specific reserved memory\n");
266 priv->use_device_memory = true;
269 if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
271 dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
275 /* The two main variants swap this register */
276 if (variant->is_pl110 || variant->is_lcdc) {
277 priv->ienb = CLCD_PL110_IENB;
278 priv->ctrl = CLCD_PL110_CNTL;
280 priv->ienb = CLCD_PL111_IENB;
281 priv->ctrl = CLCD_PL111_CNTL;
284 priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
285 if (IS_ERR(priv->regs)) {
286 dev_err(dev, "%s failed mmio\n", __func__);
287 ret = PTR_ERR(priv->regs);
291 /* This may override some variant settings */
292 ret = pl111_versatile_init(dev, priv);
296 pl111_nomadik_init(dev);
298 /* turn off interrupts before requesting the irq */
299 writel(0, priv->regs + priv->ienb);
301 ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
302 variant->name, priv);
304 dev_err(dev, "%s failed irq %d\n", __func__, ret);
308 ret = pl111_modeset_init(drm);
312 ret = drm_dev_register(drm, 0);
316 drm_fbdev_generic_setup(drm, priv->variant->fb_bpp);
322 of_reserved_mem_device_release(dev);
327 static void pl111_amba_remove(struct amba_device *amba_dev)
329 struct device *dev = &amba_dev->dev;
330 struct drm_device *drm = amba_get_drvdata(amba_dev);
331 struct pl111_drm_dev_private *priv = drm->dev_private;
333 drm_dev_unregister(drm);
335 drm_panel_bridge_remove(priv->bridge);
337 of_reserved_mem_device_release(dev);
341 * This early variant lacks the 565 and 444 pixel formats.
343 static const u32 pl110_pixel_formats[] = {
354 static const struct pl111_variant_data pl110_variant = {
357 .formats = pl110_pixel_formats,
358 .nformats = ARRAY_SIZE(pl110_pixel_formats),
362 /* RealView, Versatile Express etc use this modern variant */
363 static const u32 pl111_pixel_formats[] = {
380 static const struct pl111_variant_data pl111_variant = {
382 .formats = pl111_pixel_formats,
383 .nformats = ARRAY_SIZE(pl111_pixel_formats),
387 static const u32 pl110_nomadik_pixel_formats[] = {
406 static const struct pl111_variant_data pl110_nomadik_variant = {
407 .name = "LCDC (PL110 Nomadik)",
408 .formats = pl110_nomadik_pixel_formats,
409 .nformats = ARRAY_SIZE(pl110_nomadik_pixel_formats),
411 .st_bitmux_control = true,
412 .broken_vblank = true,
416 static const struct amba_id pl111_id_table[] = {
420 .data = (void *)&pl110_variant,
425 .data = (void *)&pl110_nomadik_variant,
430 .data = (void *)&pl111_variant,
434 MODULE_DEVICE_TABLE(amba, pl111_id_table);
436 static struct amba_driver pl111_amba_driver __maybe_unused = {
438 .name = "drm-clcd-pl111",
440 .probe = pl111_amba_probe,
441 .remove = pl111_amba_remove,
442 .id_table = pl111_id_table,
445 #ifdef CONFIG_ARM_AMBA
446 module_amba_driver(pl111_amba_driver);
449 MODULE_DESCRIPTION(DRIVER_DESC);
450 MODULE_AUTHOR("ARM Ltd.");
451 MODULE_LICENSE("GPL");