1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2022 Marek Vasut <marex@denx.de>
4 *
5 * This code is based on drivers/gpu/drm/mxsfb/mxsfb*
6 */
7
8 #include <linux/clk.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/io.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_graph.h>
14 #include <linux/platform_device.h>
15 #include <linux/pm_runtime.h>
16
17 #include <drm/drm_atomic_helper.h>
18 #include <drm/drm_bridge.h>
19 #include <drm/drm_drv.h>
20 #include <drm/drm_encoder.h>
21 #include <drm/drm_fbdev_dma.h>
22 #include <drm/drm_gem_dma_helper.h>
23 #include <drm/drm_gem_framebuffer_helper.h>
24 #include <drm/drm_mode_config.h>
25 #include <drm/drm_module.h>
26 #include <drm/drm_of.h>
27 #include <drm/drm_probe_helper.h>
28 #include <drm/drm_vblank.h>
29
30 #include "lcdif_drv.h"
31 #include "lcdif_regs.h"
32
33 static const struct drm_mode_config_funcs lcdif_mode_config_funcs = {
34 .fb_create = drm_gem_fb_create,
35 .atomic_check = drm_atomic_helper_check,
36 .atomic_commit = drm_atomic_helper_commit,
37 };
38
39 static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = {
40 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
41 };
42
43 static const struct drm_encoder_funcs lcdif_encoder_funcs = {
44 .destroy = drm_encoder_cleanup,
45 };
46
lcdif_attach_bridge(struct lcdif_drm_private * lcdif)47 static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
48 {
49 struct device *dev = lcdif->drm->dev;
50 struct device_node *ep;
51 struct drm_bridge *bridge;
52 int ret;
53
54 for_each_endpoint_of_node(dev->of_node, ep) {
55 struct device_node *remote;
56 struct of_endpoint of_ep;
57 struct drm_encoder *encoder;
58
59 remote = of_graph_get_remote_port_parent(ep);
60 if (!of_device_is_available(remote)) {
61 of_node_put(remote);
62 continue;
63 }
64 of_node_put(remote);
65
66 ret = of_graph_parse_endpoint(ep, &of_ep);
67 if (ret < 0) {
68 dev_err(dev, "Failed to parse endpoint %pOF\n", ep);
69 of_node_put(ep);
70 return ret;
71 }
72
73 bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, of_ep.id);
74 if (IS_ERR(bridge)) {
75 of_node_put(ep);
76 return dev_err_probe(dev, PTR_ERR(bridge),
77 "Failed to get bridge for endpoint%u\n",
78 of_ep.id);
79 }
80
81 encoder = devm_kzalloc(dev, sizeof(*encoder), GFP_KERNEL);
82 if (!encoder) {
83 dev_err(dev, "Failed to allocate encoder for endpoint%u\n",
84 of_ep.id);
85 of_node_put(ep);
86 return -ENOMEM;
87 }
88
89 encoder->possible_crtcs = drm_crtc_mask(&lcdif->crtc);
90 ret = drm_encoder_init(lcdif->drm, encoder, &lcdif_encoder_funcs,
91 DRM_MODE_ENCODER_NONE, NULL);
92 if (ret) {
93 dev_err(dev, "Failed to initialize encoder for endpoint%u: %d\n",
94 of_ep.id, ret);
95 of_node_put(ep);
96 return ret;
97 }
98
99 ret = drm_bridge_attach(encoder, bridge, NULL, 0);
100 if (ret) {
101 of_node_put(ep);
102 return dev_err_probe(dev, ret,
103 "Failed to attach bridge for endpoint%u\n",
104 of_ep.id);
105 }
106 }
107
108 return 0;
109 }
110
lcdif_irq_handler(int irq,void * data)111 static irqreturn_t lcdif_irq_handler(int irq, void *data)
112 {
113 struct drm_device *drm = data;
114 struct lcdif_drm_private *lcdif = drm->dev_private;
115 u32 reg, stat;
116
117 stat = readl(lcdif->base + LCDC_V8_INT_STATUS_D0);
118 if (!stat)
119 return IRQ_NONE;
120
121 if (stat & INT_STATUS_D0_VS_BLANK) {
122 reg = readl(lcdif->base + LCDC_V8_CTRLDESCL0_5);
123 if (!(reg & CTRLDESCL0_5_SHADOW_LOAD_EN))
124 drm_crtc_handle_vblank(&lcdif->crtc);
125 }
126
127 writel(stat, lcdif->base + LCDC_V8_INT_STATUS_D0);
128
129 return IRQ_HANDLED;
130 }
131
lcdif_load(struct drm_device * drm)132 static int lcdif_load(struct drm_device *drm)
133 {
134 struct platform_device *pdev = to_platform_device(drm->dev);
135 struct lcdif_drm_private *lcdif;
136 struct resource *res;
137 int ret;
138
139 lcdif = devm_kzalloc(&pdev->dev, sizeof(*lcdif), GFP_KERNEL);
140 if (!lcdif)
141 return -ENOMEM;
142
143 lcdif->drm = drm;
144 drm->dev_private = lcdif;
145
146 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
147 lcdif->base = devm_ioremap_resource(drm->dev, res);
148 if (IS_ERR(lcdif->base))
149 return PTR_ERR(lcdif->base);
150
151 lcdif->clk = devm_clk_get(drm->dev, "pix");
152 if (IS_ERR(lcdif->clk))
153 return PTR_ERR(lcdif->clk);
154
155 lcdif->clk_axi = devm_clk_get(drm->dev, "axi");
156 if (IS_ERR(lcdif->clk_axi))
157 return PTR_ERR(lcdif->clk_axi);
158
159 lcdif->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
160 if (IS_ERR(lcdif->clk_disp_axi))
161 return PTR_ERR(lcdif->clk_disp_axi);
162
163 platform_set_drvdata(pdev, drm);
164
165 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(36));
166 if (ret)
167 return ret;
168
169 /* Modeset init */
170 drm_mode_config_init(drm);
171
172 ret = lcdif_kms_init(lcdif);
173 if (ret < 0) {
174 dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
175 return ret;
176 }
177
178 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
179 if (ret < 0) {
180 dev_err(drm->dev, "Failed to initialise vblank\n");
181 return ret;
182 }
183
184 /* Start with vertical blanking interrupt reporting disabled. */
185 drm_crtc_vblank_off(&lcdif->crtc);
186
187 ret = lcdif_attach_bridge(lcdif);
188 if (ret)
189 return dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");
190
191 drm->mode_config.min_width = LCDIF_MIN_XRES;
192 drm->mode_config.min_height = LCDIF_MIN_YRES;
193 drm->mode_config.max_width = LCDIF_MAX_XRES;
194 drm->mode_config.max_height = LCDIF_MAX_YRES;
195 drm->mode_config.funcs = &lcdif_mode_config_funcs;
196 drm->mode_config.helper_private = &lcdif_mode_config_helpers;
197
198 drm_mode_config_reset(drm);
199
200 ret = platform_get_irq(pdev, 0);
201 if (ret < 0)
202 return ret;
203 lcdif->irq = ret;
204
205 ret = devm_request_irq(drm->dev, lcdif->irq, lcdif_irq_handler, 0,
206 drm->driver->name, drm);
207 if (ret < 0) {
208 dev_err(drm->dev, "Failed to install IRQ handler\n");
209 return ret;
210 }
211
212 drm_kms_helper_poll_init(drm);
213
214 drm_helper_hpd_irq_event(drm);
215
216 pm_runtime_enable(drm->dev);
217
218 return 0;
219 }
220
lcdif_unload(struct drm_device * drm)221 static void lcdif_unload(struct drm_device *drm)
222 {
223 struct lcdif_drm_private *lcdif = drm->dev_private;
224
225 pm_runtime_get_sync(drm->dev);
226
227 drm_crtc_vblank_off(&lcdif->crtc);
228
229 drm_kms_helper_poll_fini(drm);
230 drm_mode_config_cleanup(drm);
231
232 pm_runtime_put_sync(drm->dev);
233 pm_runtime_disable(drm->dev);
234
235 drm->dev_private = NULL;
236 }
237
238 DEFINE_DRM_GEM_DMA_FOPS(fops);
239
240 static const struct drm_driver lcdif_driver = {
241 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
242 DRM_GEM_DMA_DRIVER_OPS,
243 .fops = &fops,
244 .name = "imx-lcdif",
245 .desc = "i.MX LCDIF Controller DRM",
246 .date = "20220417",
247 .major = 1,
248 .minor = 0,
249 };
250
251 static const struct of_device_id lcdif_dt_ids[] = {
252 { .compatible = "fsl,imx8mp-lcdif" },
253 { .compatible = "fsl,imx93-lcdif" },
254 { /* sentinel */ }
255 };
256 MODULE_DEVICE_TABLE(of, lcdif_dt_ids);
257
lcdif_probe(struct platform_device * pdev)258 static int lcdif_probe(struct platform_device *pdev)
259 {
260 struct drm_device *drm;
261 int ret;
262
263 drm = drm_dev_alloc(&lcdif_driver, &pdev->dev);
264 if (IS_ERR(drm))
265 return PTR_ERR(drm);
266
267 ret = lcdif_load(drm);
268 if (ret)
269 goto err_free;
270
271 ret = drm_dev_register(drm, 0);
272 if (ret)
273 goto err_unload;
274
275 drm_fbdev_dma_setup(drm, 32);
276
277 return 0;
278
279 err_unload:
280 lcdif_unload(drm);
281 err_free:
282 drm_dev_put(drm);
283
284 return ret;
285 }
286
lcdif_remove(struct platform_device * pdev)287 static void lcdif_remove(struct platform_device *pdev)
288 {
289 struct drm_device *drm = platform_get_drvdata(pdev);
290
291 drm_dev_unregister(drm);
292 drm_atomic_helper_shutdown(drm);
293 lcdif_unload(drm);
294 drm_dev_put(drm);
295 }
296
lcdif_shutdown(struct platform_device * pdev)297 static void lcdif_shutdown(struct platform_device *pdev)
298 {
299 struct drm_device *drm = platform_get_drvdata(pdev);
300
301 drm_atomic_helper_shutdown(drm);
302 }
303
lcdif_rpm_suspend(struct device * dev)304 static int __maybe_unused lcdif_rpm_suspend(struct device *dev)
305 {
306 struct drm_device *drm = dev_get_drvdata(dev);
307 struct lcdif_drm_private *lcdif = drm->dev_private;
308
309 /* These clock supply the DISPLAY CLOCK Domain */
310 clk_disable_unprepare(lcdif->clk);
311 /* These clock supply the System Bus, AXI, Write Path, LFIFO */
312 clk_disable_unprepare(lcdif->clk_disp_axi);
313 /* These clock supply the Control Bus, APB, APBH Ctrl Registers */
314 clk_disable_unprepare(lcdif->clk_axi);
315
316 return 0;
317 }
318
lcdif_rpm_resume(struct device * dev)319 static int __maybe_unused lcdif_rpm_resume(struct device *dev)
320 {
321 struct drm_device *drm = dev_get_drvdata(dev);
322 struct lcdif_drm_private *lcdif = drm->dev_private;
323
324 /* These clock supply the Control Bus, APB, APBH Ctrl Registers */
325 clk_prepare_enable(lcdif->clk_axi);
326 /* These clock supply the System Bus, AXI, Write Path, LFIFO */
327 clk_prepare_enable(lcdif->clk_disp_axi);
328 /* These clock supply the DISPLAY CLOCK Domain */
329 clk_prepare_enable(lcdif->clk);
330
331 return 0;
332 }
333
lcdif_suspend(struct device * dev)334 static int __maybe_unused lcdif_suspend(struct device *dev)
335 {
336 struct drm_device *drm = dev_get_drvdata(dev);
337 int ret;
338
339 ret = drm_mode_config_helper_suspend(drm);
340 if (ret)
341 return ret;
342
343 if (pm_runtime_suspended(dev))
344 return 0;
345
346 return lcdif_rpm_suspend(dev);
347 }
348
lcdif_resume(struct device * dev)349 static int __maybe_unused lcdif_resume(struct device *dev)
350 {
351 struct drm_device *drm = dev_get_drvdata(dev);
352
353 if (!pm_runtime_suspended(dev))
354 lcdif_rpm_resume(dev);
355
356 return drm_mode_config_helper_resume(drm);
357 }
358
359 static const struct dev_pm_ops lcdif_pm_ops = {
360 SET_SYSTEM_SLEEP_PM_OPS(lcdif_suspend, lcdif_resume)
361 SET_RUNTIME_PM_OPS(lcdif_rpm_suspend, lcdif_rpm_resume, NULL)
362 };
363
364 static struct platform_driver lcdif_platform_driver = {
365 .probe = lcdif_probe,
366 .remove_new = lcdif_remove,
367 .shutdown = lcdif_shutdown,
368 .driver = {
369 .name = "imx-lcdif",
370 .of_match_table = lcdif_dt_ids,
371 .pm = &lcdif_pm_ops,
372 },
373 };
374
375 drm_module_platform_driver(lcdif_platform_driver);
376
377 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
378 MODULE_DESCRIPTION("Freescale LCDIF DRM/KMS driver");
379 MODULE_LICENSE("GPL");
380