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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_client_setup.h>
51#include <drm/drm_drv.h>
52#include <drm/drm_fbdev_dma.h>
53#include <drm/drm_fourcc.h>
54#include <drm/drm_gem_dma_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
67static 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
73static 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
189out_bridge:
190 if (panel)
191 drm_panel_bridge_remove(bridge);
192finish:
193 return ret;
194}
195
196static struct drm_gem_object *
197pl111_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_dma_prime_import_sg_table(dev, attach, sgt);
212}
213
214DEFINE_DRM_GEM_DMA_FOPS(drm_fops);
215
216static 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_dma_dumb_create,
228 .gem_prime_import_sg_table = pl111_gem_import_sg_table,
229 DRM_FBDEV_DMA_DRIVER_OPS,
230
231#if defined(CONFIG_DEBUG_FS)
232 .debugfs_init = pl111_debugfs_init,
233#endif
234};
235
236static int pl111_amba_probe(struct amba_device *amba_dev,
237 const struct amba_id *id)
238{
239 struct device *dev = &amba_dev->dev;
240 struct pl111_drm_dev_private *priv;
241 const struct pl111_variant_data *variant = id->data;
242 struct drm_device *drm;
243 int ret;
244
245 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
246 if (!priv)
247 return -ENOMEM;
248
249 drm = drm_dev_alloc(&pl111_drm_driver, dev);
250 if (IS_ERR(drm))
251 return PTR_ERR(drm);
252 amba_set_drvdata(amba_dev, drm);
253 priv->drm = drm;
254 drm->dev_private = priv;
255 priv->variant = variant;
256
257 ret = of_reserved_mem_device_init(dev);
258 if (!ret) {
259 dev_info(dev, "using device-specific reserved memory\n");
260 priv->use_device_memory = true;
261 }
262
263 if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
264 &priv->memory_bw)) {
265 dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
266 priv->memory_bw = 0;
267 }
268
269 /* The two main variants swap this register */
270 if (variant->is_pl110 || variant->is_lcdc) {
271 priv->ienb = CLCD_PL110_IENB;
272 priv->ctrl = CLCD_PL110_CNTL;
273 } else {
274 priv->ienb = CLCD_PL111_IENB;
275 priv->ctrl = CLCD_PL111_CNTL;
276 }
277
278 priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
279 if (IS_ERR(priv->regs)) {
280 dev_err(dev, "%s failed mmio\n", __func__);
281 ret = PTR_ERR(priv->regs);
282 goto dev_put;
283 }
284
285 /* This may override some variant settings */
286 ret = pl111_versatile_init(dev, priv);
287 if (ret)
288 goto dev_put;
289
290 pl111_nomadik_init(dev);
291
292 /* turn off interrupts before requesting the irq */
293 writel(0, priv->regs + priv->ienb);
294
295 ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
296 variant->name, priv);
297 if (ret != 0) {
298 dev_err(dev, "%s failed irq %d\n", __func__, ret);
299 return ret;
300 }
301
302 ret = pl111_modeset_init(drm);
303 if (ret != 0)
304 goto dev_put;
305
306 ret = drm_dev_register(drm, 0);
307 if (ret < 0)
308 goto dev_put;
309
310 drm_client_setup_with_color_mode(drm, priv->variant->fb_depth);
311
312 return 0;
313
314dev_put:
315 drm_dev_put(drm);
316 of_reserved_mem_device_release(dev);
317
318 return ret;
319}
320
321static void pl111_amba_remove(struct amba_device *amba_dev)
322{
323 struct device *dev = &amba_dev->dev;
324 struct drm_device *drm = amba_get_drvdata(amba_dev);
325 struct pl111_drm_dev_private *priv = drm->dev_private;
326
327 drm_dev_unregister(drm);
328 drm_atomic_helper_shutdown(drm);
329 if (priv->panel)
330 drm_panel_bridge_remove(priv->bridge);
331 drm_dev_put(drm);
332 of_reserved_mem_device_release(dev);
333}
334
335static void pl111_amba_shutdown(struct amba_device *amba_dev)
336{
337 drm_atomic_helper_shutdown(amba_get_drvdata(amba_dev));
338}
339
340/*
341 * This early variant lacks the 565 and 444 pixel formats.
342 */
343static const u32 pl110_pixel_formats[] = {
344 DRM_FORMAT_ABGR8888,
345 DRM_FORMAT_XBGR8888,
346 DRM_FORMAT_ARGB8888,
347 DRM_FORMAT_XRGB8888,
348 DRM_FORMAT_ABGR1555,
349 DRM_FORMAT_XBGR1555,
350 DRM_FORMAT_ARGB1555,
351 DRM_FORMAT_XRGB1555,
352};
353
354static const struct pl111_variant_data pl110_variant = {
355 .name = "PL110",
356 .is_pl110 = true,
357 .formats = pl110_pixel_formats,
358 .nformats = ARRAY_SIZE(pl110_pixel_formats),
359 .fb_depth = 16,
360};
361
362/* RealView, Versatile Express etc use this modern variant */
363static const u32 pl111_pixel_formats[] = {
364 DRM_FORMAT_ABGR8888,
365 DRM_FORMAT_XBGR8888,
366 DRM_FORMAT_ARGB8888,
367 DRM_FORMAT_XRGB8888,
368 DRM_FORMAT_BGR565,
369 DRM_FORMAT_RGB565,
370 DRM_FORMAT_ABGR1555,
371 DRM_FORMAT_XBGR1555,
372 DRM_FORMAT_ARGB1555,
373 DRM_FORMAT_XRGB1555,
374 DRM_FORMAT_ABGR4444,
375 DRM_FORMAT_XBGR4444,
376 DRM_FORMAT_ARGB4444,
377 DRM_FORMAT_XRGB4444,
378};
379
380static const struct pl111_variant_data pl111_variant = {
381 .name = "PL111",
382 .formats = pl111_pixel_formats,
383 .nformats = ARRAY_SIZE(pl111_pixel_formats),
384 .fb_depth = 32,
385};
386
387static const u32 pl110_nomadik_pixel_formats[] = {
388 DRM_FORMAT_RGB888,
389 DRM_FORMAT_BGR888,
390 DRM_FORMAT_ABGR8888,
391 DRM_FORMAT_XBGR8888,
392 DRM_FORMAT_ARGB8888,
393 DRM_FORMAT_XRGB8888,
394 DRM_FORMAT_BGR565,
395 DRM_FORMAT_RGB565,
396 DRM_FORMAT_ABGR1555,
397 DRM_FORMAT_XBGR1555,
398 DRM_FORMAT_ARGB1555,
399 DRM_FORMAT_XRGB1555,
400 DRM_FORMAT_ABGR4444,
401 DRM_FORMAT_XBGR4444,
402 DRM_FORMAT_ARGB4444,
403 DRM_FORMAT_XRGB4444,
404};
405
406static 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),
410 .is_lcdc = true,
411 .st_bitmux_control = true,
412 .broken_vblank = true,
413 .fb_depth = 16,
414};
415
416static const struct amba_id pl111_id_table[] = {
417 {
418 .id = 0x00041110,
419 .mask = 0x000fffff,
420 .data = (void *)&pl110_variant,
421 },
422 {
423 .id = 0x00180110,
424 .mask = 0x00fffffe,
425 .data = (void *)&pl110_nomadik_variant,
426 },
427 {
428 .id = 0x00041111,
429 .mask = 0x000fffff,
430 .data = (void *)&pl111_variant,
431 },
432 {0, 0},
433};
434MODULE_DEVICE_TABLE(amba, pl111_id_table);
435
436static struct amba_driver pl111_amba_driver __maybe_unused = {
437 .drv = {
438 .name = "drm-clcd-pl111",
439 },
440 .probe = pl111_amba_probe,
441 .remove = pl111_amba_remove,
442 .shutdown = pl111_amba_shutdown,
443 .id_table = pl111_id_table,
444};
445
446#ifdef CONFIG_ARM_AMBA
447module_amba_driver(pl111_amba_driver);
448#endif
449
450MODULE_DESCRIPTION(DRIVER_DESC);
451MODULE_AUTHOR("ARM Ltd.");
452MODULE_LICENSE("GPL");