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