xref: /linux/drivers/gpu/drm/mxsfb/mxsfb_drv.c (revision 4f2c0a4acffbec01079c28f839422e64ddeff004) 
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2016 Marek Vasut <marex@denx.de>
4  *
5  * This code is based on drivers/video/fbdev/mxsfb.c :
6  * Copyright (C) 2010 Juergen Beisert, Pengutronix
7  * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
8  * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
9  */
10 
11 #include <linux/clk.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/of_device.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_runtime.h>
18 
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_bridge.h>
21 #include <drm/drm_connector.h>
22 #include <drm/drm_drv.h>
23 #include <drm/drm_fb_helper.h>
24 #include <drm/drm_fourcc.h>
25 #include <drm/drm_gem_dma_helper.h>
26 #include <drm/drm_gem_framebuffer_helper.h>
27 #include <drm/drm_mode_config.h>
28 #include <drm/drm_module.h>
29 #include <drm/drm_of.h>
30 #include <drm/drm_probe_helper.h>
31 #include <drm/drm_vblank.h>
32 
33 #include "mxsfb_drv.h"
34 #include "mxsfb_regs.h"
35 
36 enum mxsfb_devtype {
37 	MXSFB_V3,
38 	MXSFB_V4,
39 	/*
40 	 * Starting at i.MX6 the hardware version register is gone, use the
41 	 * i.MX family number as the version.
42 	 */
43 	MXSFB_V6,
44 };
45 
46 static const struct mxsfb_devdata mxsfb_devdata[] = {
47 	[MXSFB_V3] = {
48 		.transfer_count	= LCDC_V3_TRANSFER_COUNT,
49 		.cur_buf	= LCDC_V3_CUR_BUF,
50 		.next_buf	= LCDC_V3_NEXT_BUF,
51 		.hs_wdth_mask	= 0xff,
52 		.hs_wdth_shift	= 24,
53 		.has_overlay	= false,
54 		.has_ctrl2	= false,
55 		.has_crc32	= false,
56 	},
57 	[MXSFB_V4] = {
58 		.transfer_count	= LCDC_V4_TRANSFER_COUNT,
59 		.cur_buf	= LCDC_V4_CUR_BUF,
60 		.next_buf	= LCDC_V4_NEXT_BUF,
61 		.hs_wdth_mask	= 0x3fff,
62 		.hs_wdth_shift	= 18,
63 		.has_overlay	= false,
64 		.has_ctrl2	= true,
65 		.has_crc32	= true,
66 	},
67 	[MXSFB_V6] = {
68 		.transfer_count	= LCDC_V4_TRANSFER_COUNT,
69 		.cur_buf	= LCDC_V4_CUR_BUF,
70 		.next_buf	= LCDC_V4_NEXT_BUF,
71 		.hs_wdth_mask	= 0x3fff,
72 		.hs_wdth_shift	= 18,
73 		.has_overlay	= true,
74 		.has_ctrl2	= true,
75 		.has_crc32	= true,
76 	},
77 };
78 
79 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
80 {
81 	if (mxsfb->clk_axi)
82 		clk_prepare_enable(mxsfb->clk_axi);
83 }
84 
85 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
86 {
87 	if (mxsfb->clk_axi)
88 		clk_disable_unprepare(mxsfb->clk_axi);
89 }
90 
91 static struct drm_framebuffer *
92 mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv,
93 		const struct drm_mode_fb_cmd2 *mode_cmd)
94 {
95 	const struct drm_format_info *info;
96 
97 	info = drm_get_format_info(dev, mode_cmd);
98 	if (!info)
99 		return ERR_PTR(-EINVAL);
100 
101 	if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) {
102 		dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n");
103 		return ERR_PTR(-EINVAL);
104 	}
105 
106 	return drm_gem_fb_create(dev, file_priv, mode_cmd);
107 }
108 
109 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
110 	.fb_create		= mxsfb_fb_create,
111 	.atomic_check		= drm_atomic_helper_check,
112 	.atomic_commit		= drm_atomic_helper_commit,
113 };
114 
115 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
116 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
117 };
118 
119 static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
120 {
121 	struct drm_device *drm = mxsfb->drm;
122 	struct drm_connector_list_iter iter;
123 	struct drm_panel *panel;
124 	struct drm_bridge *bridge;
125 	int ret;
126 
127 	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,
128 					  &bridge);
129 	if (ret)
130 		return ret;
131 
132 	if (panel) {
133 		bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel,
134 							 DRM_MODE_CONNECTOR_DPI);
135 		if (IS_ERR(bridge))
136 			return PTR_ERR(bridge);
137 	}
138 
139 	if (!bridge)
140 		return -ENODEV;
141 
142 	ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0);
143 	if (ret)
144 		return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
145 
146 	mxsfb->bridge = bridge;
147 
148 	/*
149 	 * Get hold of the connector. This is a bit of a hack, until the bridge
150 	 * API gives us bus flags and formats.
151 	 */
152 	drm_connector_list_iter_begin(drm, &iter);
153 	mxsfb->connector = drm_connector_list_iter_next(&iter);
154 	drm_connector_list_iter_end(&iter);
155 
156 	return 0;
157 }
158 
159 static irqreturn_t mxsfb_irq_handler(int irq, void *data)
160 {
161 	struct drm_device *drm = data;
162 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
163 	u32 reg, crc;
164 	u64 vbc;
165 
166 	reg = readl(mxsfb->base + LCDC_CTRL1);
167 
168 	if (reg & CTRL1_CUR_FRAME_DONE_IRQ) {
169 		drm_crtc_handle_vblank(&mxsfb->crtc);
170 		if (mxsfb->crc_active) {
171 			crc = readl(mxsfb->base + LCDC_V4_CRC_STAT);
172 			vbc = drm_crtc_accurate_vblank_count(&mxsfb->crtc);
173 			drm_crtc_add_crc_entry(&mxsfb->crtc, true, vbc, &crc);
174 		}
175 	}
176 
177 	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
178 
179 	return IRQ_HANDLED;
180 }
181 
182 static void mxsfb_irq_disable(struct drm_device *drm)
183 {
184 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
185 
186 	mxsfb_enable_axi_clk(mxsfb);
187 
188 	/* Disable and clear VBLANK IRQ */
189 	writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
190 	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
191 
192 	mxsfb_disable_axi_clk(mxsfb);
193 }
194 
195 static int mxsfb_irq_install(struct drm_device *dev, int irq)
196 {
197 	if (irq == IRQ_NOTCONNECTED)
198 		return -ENOTCONN;
199 
200 	mxsfb_irq_disable(dev);
201 
202 	return request_irq(irq, mxsfb_irq_handler, 0,  dev->driver->name, dev);
203 }
204 
205 static void mxsfb_irq_uninstall(struct drm_device *dev)
206 {
207 	struct mxsfb_drm_private *mxsfb = dev->dev_private;
208 
209 	mxsfb_irq_disable(dev);
210 	free_irq(mxsfb->irq, dev);
211 }
212 
213 static int mxsfb_load(struct drm_device *drm,
214 		      const struct mxsfb_devdata *devdata)
215 {
216 	struct platform_device *pdev = to_platform_device(drm->dev);
217 	struct mxsfb_drm_private *mxsfb;
218 	struct resource *res;
219 	int ret;
220 
221 	mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
222 	if (!mxsfb)
223 		return -ENOMEM;
224 
225 	mxsfb->drm = drm;
226 	drm->dev_private = mxsfb;
227 	mxsfb->devdata = devdata;
228 
229 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
230 	mxsfb->base = devm_ioremap_resource(drm->dev, res);
231 	if (IS_ERR(mxsfb->base))
232 		return PTR_ERR(mxsfb->base);
233 
234 	mxsfb->clk = devm_clk_get(drm->dev, NULL);
235 	if (IS_ERR(mxsfb->clk))
236 		return PTR_ERR(mxsfb->clk);
237 
238 	mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
239 	if (IS_ERR(mxsfb->clk_axi))
240 		mxsfb->clk_axi = NULL;
241 
242 	mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
243 	if (IS_ERR(mxsfb->clk_disp_axi))
244 		mxsfb->clk_disp_axi = NULL;
245 
246 	ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
247 	if (ret)
248 		return ret;
249 
250 	pm_runtime_enable(drm->dev);
251 
252 	/* Modeset init */
253 	drm_mode_config_init(drm);
254 
255 	ret = mxsfb_kms_init(mxsfb);
256 	if (ret < 0) {
257 		dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
258 		goto err_vblank;
259 	}
260 
261 	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
262 	if (ret < 0) {
263 		dev_err(drm->dev, "Failed to initialise vblank\n");
264 		goto err_vblank;
265 	}
266 
267 	/* Start with vertical blanking interrupt reporting disabled. */
268 	drm_crtc_vblank_off(&mxsfb->crtc);
269 
270 	ret = mxsfb_attach_bridge(mxsfb);
271 	if (ret) {
272 		dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");
273 		goto err_vblank;
274 	}
275 
276 	drm->mode_config.min_width	= MXSFB_MIN_XRES;
277 	drm->mode_config.min_height	= MXSFB_MIN_YRES;
278 	drm->mode_config.max_width	= MXSFB_MAX_XRES;
279 	drm->mode_config.max_height	= MXSFB_MAX_YRES;
280 	drm->mode_config.funcs		= &mxsfb_mode_config_funcs;
281 	drm->mode_config.helper_private	= &mxsfb_mode_config_helpers;
282 
283 	drm_mode_config_reset(drm);
284 
285 	ret = platform_get_irq(pdev, 0);
286 	if (ret < 0)
287 		goto err_vblank;
288 	mxsfb->irq = ret;
289 
290 	pm_runtime_get_sync(drm->dev);
291 	ret = mxsfb_irq_install(drm, mxsfb->irq);
292 	pm_runtime_put_sync(drm->dev);
293 
294 	if (ret < 0) {
295 		dev_err(drm->dev, "Failed to install IRQ handler\n");
296 		goto err_vblank;
297 	}
298 
299 	drm_kms_helper_poll_init(drm);
300 
301 	platform_set_drvdata(pdev, drm);
302 
303 	drm_helper_hpd_irq_event(drm);
304 
305 	return 0;
306 
307 err_vblank:
308 	pm_runtime_disable(drm->dev);
309 
310 	return ret;
311 }
312 
313 static void mxsfb_unload(struct drm_device *drm)
314 {
315 	drm_kms_helper_poll_fini(drm);
316 	drm_mode_config_cleanup(drm);
317 
318 	pm_runtime_get_sync(drm->dev);
319 	mxsfb_irq_uninstall(drm);
320 	pm_runtime_put_sync(drm->dev);
321 
322 	drm->dev_private = NULL;
323 
324 	pm_runtime_disable(drm->dev);
325 }
326 
327 DEFINE_DRM_GEM_DMA_FOPS(fops);
328 
329 static const struct drm_driver mxsfb_driver = {
330 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
331 	DRM_GEM_DMA_DRIVER_OPS,
332 	.fops	= &fops,
333 	.name	= "mxsfb-drm",
334 	.desc	= "MXSFB Controller DRM",
335 	.date	= "20160824",
336 	.major	= 1,
337 	.minor	= 0,
338 };
339 
340 static const struct of_device_id mxsfb_dt_ids[] = {
341 	{ .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], },
342 	{ .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], },
343 	{ .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], },
344 	{ /* sentinel */ }
345 };
346 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
347 
348 static int mxsfb_probe(struct platform_device *pdev)
349 {
350 	struct drm_device *drm;
351 	const struct of_device_id *of_id =
352 			of_match_device(mxsfb_dt_ids, &pdev->dev);
353 	int ret;
354 
355 	if (!pdev->dev.of_node)
356 		return -ENODEV;
357 
358 	drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
359 	if (IS_ERR(drm))
360 		return PTR_ERR(drm);
361 
362 	ret = mxsfb_load(drm, of_id->data);
363 	if (ret)
364 		goto err_free;
365 
366 	ret = drm_dev_register(drm, 0);
367 	if (ret)
368 		goto err_unload;
369 
370 	drm_fbdev_generic_setup(drm, 32);
371 
372 	return 0;
373 
374 err_unload:
375 	mxsfb_unload(drm);
376 err_free:
377 	drm_dev_put(drm);
378 
379 	return ret;
380 }
381 
382 static int mxsfb_remove(struct platform_device *pdev)
383 {
384 	struct drm_device *drm = platform_get_drvdata(pdev);
385 
386 	drm_dev_unregister(drm);
387 	drm_atomic_helper_shutdown(drm);
388 	mxsfb_unload(drm);
389 	drm_dev_put(drm);
390 
391 	return 0;
392 }
393 
394 static void mxsfb_shutdown(struct platform_device *pdev)
395 {
396 	struct drm_device *drm = platform_get_drvdata(pdev);
397 
398 	drm_atomic_helper_shutdown(drm);
399 }
400 
401 #ifdef CONFIG_PM_SLEEP
402 static int mxsfb_suspend(struct device *dev)
403 {
404 	struct drm_device *drm = dev_get_drvdata(dev);
405 
406 	return drm_mode_config_helper_suspend(drm);
407 }
408 
409 static int mxsfb_resume(struct device *dev)
410 {
411 	struct drm_device *drm = dev_get_drvdata(dev);
412 
413 	return drm_mode_config_helper_resume(drm);
414 }
415 #endif
416 
417 static const struct dev_pm_ops mxsfb_pm_ops = {
418 	SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)
419 };
420 
421 static struct platform_driver mxsfb_platform_driver = {
422 	.probe		= mxsfb_probe,
423 	.remove		= mxsfb_remove,
424 	.shutdown	= mxsfb_shutdown,
425 	.driver	= {
426 		.name		= "mxsfb",
427 		.of_match_table	= mxsfb_dt_ids,
428 		.pm		= &mxsfb_pm_ops,
429 	},
430 };
431 
432 drm_module_platform_driver(mxsfb_platform_driver);
433 
434 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
435 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
436 MODULE_LICENSE("GPL");
437