xref: /openbmc/linux/drivers/gpu/drm/mxsfb/mxsfb_drv.c (revision 2b77dcc5) 
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/component.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/list.h>
15 #include <linux/module.h>
16 #include <linux/of_device.h>
17 #include <linux/of_graph.h>
18 #include <linux/of_reserved_mem.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/dma-resv.h>
21 #include <linux/spinlock.h>
22 
23 #include <drm/drm_atomic.h>
24 #include <drm/drm_atomic_helper.h>
25 #include <drm/drm_crtc.h>
26 #include <drm/drm_drv.h>
27 #include <drm/drm_fb_cma_helper.h>
28 #include <drm/drm_fb_helper.h>
29 #include <drm/drm_gem_cma_helper.h>
30 #include <drm/drm_gem_framebuffer_helper.h>
31 #include <drm/drm_irq.h>
32 #include <drm/drm_of.h>
33 #include <drm/drm_panel.h>
34 #include <drm/drm_probe_helper.h>
35 #include <drm/drm_simple_kms_helper.h>
36 #include <drm/drm_vblank.h>
37 
38 #include "mxsfb_drv.h"
39 #include "mxsfb_regs.h"
40 
41 enum mxsfb_devtype {
42 	MXSFB_V3,
43 	MXSFB_V4,
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 		.debug0		= LCDC_V3_DEBUG0,
52 		.hs_wdth_mask	= 0xff,
53 		.hs_wdth_shift	= 24,
54 		.ipversion	= 3,
55 	},
56 	[MXSFB_V4] = {
57 		.transfer_count	= LCDC_V4_TRANSFER_COUNT,
58 		.cur_buf	= LCDC_V4_CUR_BUF,
59 		.next_buf	= LCDC_V4_NEXT_BUF,
60 		.debug0		= LCDC_V4_DEBUG0,
61 		.hs_wdth_mask	= 0x3fff,
62 		.hs_wdth_shift	= 18,
63 		.ipversion	= 4,
64 	},
65 };
66 
67 static const uint32_t mxsfb_formats[] = {
68 	DRM_FORMAT_XRGB8888,
69 	DRM_FORMAT_RGB565
70 };
71 
72 static struct mxsfb_drm_private *
73 drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe)
74 {
75 	return container_of(pipe, struct mxsfb_drm_private, pipe);
76 }
77 
78 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
79 {
80 	if (mxsfb->clk_axi)
81 		clk_prepare_enable(mxsfb->clk_axi);
82 }
83 
84 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
85 {
86 	if (mxsfb->clk_axi)
87 		clk_disable_unprepare(mxsfb->clk_axi);
88 }
89 
90 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
91 	.fb_create		= drm_gem_fb_create,
92 	.atomic_check		= drm_atomic_helper_check,
93 	.atomic_commit		= drm_atomic_helper_commit,
94 };
95 
96 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
97 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
98 };
99 
100 static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
101 			      struct drm_crtc_state *crtc_state,
102 			      struct drm_plane_state *plane_state)
103 {
104 	struct drm_connector *connector;
105 	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
106 	struct drm_device *drm = pipe->plane.dev;
107 
108 	if (!mxsfb->connector) {
109 		list_for_each_entry(connector,
110 				    &drm->mode_config.connector_list,
111 				    head)
112 			if (connector->encoder == &mxsfb->pipe.encoder) {
113 				mxsfb->connector = connector;
114 				break;
115 			}
116 	}
117 
118 	if (!mxsfb->connector) {
119 		dev_warn(drm->dev, "No connector attached, using default\n");
120 		mxsfb->connector = &mxsfb->panel_connector;
121 	}
122 
123 	pm_runtime_get_sync(drm->dev);
124 	drm_panel_prepare(mxsfb->panel);
125 	mxsfb_crtc_enable(mxsfb);
126 	drm_panel_enable(mxsfb->panel);
127 }
128 
129 static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
130 {
131 	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
132 	struct drm_device *drm = pipe->plane.dev;
133 	struct drm_crtc *crtc = &pipe->crtc;
134 	struct drm_pending_vblank_event *event;
135 
136 	drm_panel_disable(mxsfb->panel);
137 	mxsfb_crtc_disable(mxsfb);
138 	drm_panel_unprepare(mxsfb->panel);
139 	pm_runtime_put_sync(drm->dev);
140 
141 	spin_lock_irq(&drm->event_lock);
142 	event = crtc->state->event;
143 	if (event) {
144 		crtc->state->event = NULL;
145 		drm_crtc_send_vblank_event(crtc, event);
146 	}
147 	spin_unlock_irq(&drm->event_lock);
148 
149 	if (mxsfb->connector != &mxsfb->panel_connector)
150 		mxsfb->connector = NULL;
151 }
152 
153 static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
154 			      struct drm_plane_state *plane_state)
155 {
156 	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
157 
158 	mxsfb_plane_atomic_update(mxsfb, plane_state);
159 }
160 
161 static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe)
162 {
163 	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
164 
165 	/* Clear and enable VBLANK IRQ */
166 	mxsfb_enable_axi_clk(mxsfb);
167 	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
168 	writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
169 	mxsfb_disable_axi_clk(mxsfb);
170 
171 	return 0;
172 }
173 
174 static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe)
175 {
176 	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
177 
178 	/* Disable and clear VBLANK IRQ */
179 	mxsfb_enable_axi_clk(mxsfb);
180 	writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
181 	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
182 	mxsfb_disable_axi_clk(mxsfb);
183 }
184 
185 static struct drm_simple_display_pipe_funcs mxsfb_funcs = {
186 	.enable		= mxsfb_pipe_enable,
187 	.disable	= mxsfb_pipe_disable,
188 	.update		= mxsfb_pipe_update,
189 	.prepare_fb	= drm_gem_fb_simple_display_pipe_prepare_fb,
190 	.enable_vblank	= mxsfb_pipe_enable_vblank,
191 	.disable_vblank	= mxsfb_pipe_disable_vblank,
192 };
193 
194 static int mxsfb_load(struct drm_device *drm, unsigned long flags)
195 {
196 	struct platform_device *pdev = to_platform_device(drm->dev);
197 	struct mxsfb_drm_private *mxsfb;
198 	struct resource *res;
199 	int ret;
200 
201 	mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
202 	if (!mxsfb)
203 		return -ENOMEM;
204 
205 	drm->dev_private = mxsfb;
206 	mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
207 
208 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
209 	mxsfb->base = devm_ioremap_resource(drm->dev, res);
210 	if (IS_ERR(mxsfb->base))
211 		return PTR_ERR(mxsfb->base);
212 
213 	mxsfb->clk = devm_clk_get(drm->dev, NULL);
214 	if (IS_ERR(mxsfb->clk))
215 		return PTR_ERR(mxsfb->clk);
216 
217 	mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
218 	if (IS_ERR(mxsfb->clk_axi))
219 		mxsfb->clk_axi = NULL;
220 
221 	mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
222 	if (IS_ERR(mxsfb->clk_disp_axi))
223 		mxsfb->clk_disp_axi = NULL;
224 
225 	ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
226 	if (ret)
227 		return ret;
228 
229 	pm_runtime_enable(drm->dev);
230 
231 	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
232 	if (ret < 0) {
233 		dev_err(drm->dev, "Failed to initialise vblank\n");
234 		goto err_vblank;
235 	}
236 
237 	/* Modeset init */
238 	drm_mode_config_init(drm);
239 
240 	ret = mxsfb_create_output(drm);
241 	if (ret < 0) {
242 		dev_err(drm->dev, "Failed to create outputs\n");
243 		goto err_vblank;
244 	}
245 
246 	ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
247 			mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL,
248 			mxsfb->connector);
249 	if (ret < 0) {
250 		dev_err(drm->dev, "Cannot setup simple display pipe\n");
251 		goto err_vblank;
252 	}
253 
254 	/*
255 	 * Attach panel only if there is one.
256 	 * If there is no panel attach, it must be a bridge. In this case, we
257 	 * need a reference to its connector for a proper initialization.
258 	 * We will do this check in pipe->enable(), since the connector won't
259 	 * be attached to an encoder until then.
260 	 */
261 
262 	if (mxsfb->panel) {
263 		ret = drm_panel_attach(mxsfb->panel, mxsfb->connector);
264 		if (ret) {
265 			dev_err(drm->dev, "Cannot connect panel: %d\n", ret);
266 			goto err_vblank;
267 		}
268 	} else if (mxsfb->bridge) {
269 		ret = drm_simple_display_pipe_attach_bridge(&mxsfb->pipe,
270 							    mxsfb->bridge);
271 		if (ret) {
272 			dev_err(drm->dev, "Cannot connect bridge: %d\n", ret);
273 			goto err_vblank;
274 		}
275 	}
276 
277 	drm->mode_config.min_width	= MXSFB_MIN_XRES;
278 	drm->mode_config.min_height	= MXSFB_MIN_YRES;
279 	drm->mode_config.max_width	= MXSFB_MAX_XRES;
280 	drm->mode_config.max_height	= MXSFB_MAX_YRES;
281 	drm->mode_config.funcs		= &mxsfb_mode_config_funcs;
282 	drm->mode_config.helper_private	= &mxsfb_mode_config_helpers;
283 
284 	drm_mode_config_reset(drm);
285 
286 	pm_runtime_get_sync(drm->dev);
287 	ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
288 	pm_runtime_put_sync(drm->dev);
289 
290 	if (ret < 0) {
291 		dev_err(drm->dev, "Failed to install IRQ handler\n");
292 		goto err_irq;
293 	}
294 
295 	drm_kms_helper_poll_init(drm);
296 
297 	platform_set_drvdata(pdev, drm);
298 
299 	drm_helper_hpd_irq_event(drm);
300 
301 	return 0;
302 
303 err_irq:
304 	drm_panel_detach(mxsfb->panel);
305 err_vblank:
306 	pm_runtime_disable(drm->dev);
307 
308 	return ret;
309 }
310 
311 static void mxsfb_unload(struct drm_device *drm)
312 {
313 	drm_kms_helper_poll_fini(drm);
314 	drm_mode_config_cleanup(drm);
315 
316 	pm_runtime_get_sync(drm->dev);
317 	drm_irq_uninstall(drm);
318 	pm_runtime_put_sync(drm->dev);
319 
320 	drm->dev_private = NULL;
321 
322 	pm_runtime_disable(drm->dev);
323 }
324 
325 static void mxsfb_irq_preinstall(struct drm_device *drm)
326 {
327 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
328 
329 	mxsfb_pipe_disable_vblank(&mxsfb->pipe);
330 }
331 
332 static irqreturn_t mxsfb_irq_handler(int irq, void *data)
333 {
334 	struct drm_device *drm = data;
335 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
336 	u32 reg;
337 
338 	mxsfb_enable_axi_clk(mxsfb);
339 
340 	reg = readl(mxsfb->base + LCDC_CTRL1);
341 
342 	if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
343 		drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
344 
345 	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
346 
347 	mxsfb_disable_axi_clk(mxsfb);
348 
349 	return IRQ_HANDLED;
350 }
351 
352 DEFINE_DRM_GEM_CMA_FOPS(fops);
353 
354 static struct drm_driver mxsfb_driver = {
355 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
356 	.irq_handler		= mxsfb_irq_handler,
357 	.irq_preinstall		= mxsfb_irq_preinstall,
358 	.irq_uninstall		= mxsfb_irq_preinstall,
359 	.gem_free_object_unlocked = drm_gem_cma_free_object,
360 	.gem_vm_ops		= &drm_gem_cma_vm_ops,
361 	.dumb_create		= drm_gem_cma_dumb_create,
362 	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
363 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
364 	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
365 	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
366 	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
367 	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
368 	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
369 	.fops	= &fops,
370 	.name	= "mxsfb-drm",
371 	.desc	= "MXSFB Controller DRM",
372 	.date	= "20160824",
373 	.major	= 1,
374 	.minor	= 0,
375 };
376 
377 static const struct platform_device_id mxsfb_devtype[] = {
378 	{ .name = "imx23-fb", .driver_data = MXSFB_V3, },
379 	{ .name = "imx28-fb", .driver_data = MXSFB_V4, },
380 	{ .name = "imx6sx-fb", .driver_data = MXSFB_V4, },
381 	{ /* sentinel */ }
382 };
383 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
384 
385 static const struct of_device_id mxsfb_dt_ids[] = {
386 	{ .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
387 	{ .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
388 	{ .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], },
389 	{ /* sentinel */ }
390 };
391 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
392 
393 static int mxsfb_probe(struct platform_device *pdev)
394 {
395 	struct drm_device *drm;
396 	const struct of_device_id *of_id =
397 			of_match_device(mxsfb_dt_ids, &pdev->dev);
398 	int ret;
399 
400 	if (!pdev->dev.of_node)
401 		return -ENODEV;
402 
403 	if (of_id)
404 		pdev->id_entry = of_id->data;
405 
406 	drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
407 	if (IS_ERR(drm))
408 		return PTR_ERR(drm);
409 
410 	ret = mxsfb_load(drm, 0);
411 	if (ret)
412 		goto err_free;
413 
414 	ret = drm_dev_register(drm, 0);
415 	if (ret)
416 		goto err_unload;
417 
418 	drm_fbdev_generic_setup(drm, 32);
419 
420 	return 0;
421 
422 err_unload:
423 	mxsfb_unload(drm);
424 err_free:
425 	drm_dev_put(drm);
426 
427 	return ret;
428 }
429 
430 static int mxsfb_remove(struct platform_device *pdev)
431 {
432 	struct drm_device *drm = platform_get_drvdata(pdev);
433 
434 	drm_dev_unregister(drm);
435 	mxsfb_unload(drm);
436 	drm_dev_put(drm);
437 
438 	return 0;
439 }
440 
441 #ifdef CONFIG_PM_SLEEP
442 static int mxsfb_suspend(struct device *dev)
443 {
444 	struct drm_device *drm = dev_get_drvdata(dev);
445 
446 	return drm_mode_config_helper_suspend(drm);
447 }
448 
449 static int mxsfb_resume(struct device *dev)
450 {
451 	struct drm_device *drm = dev_get_drvdata(dev);
452 
453 	return drm_mode_config_helper_resume(drm);
454 }
455 #endif
456 
457 static const struct dev_pm_ops mxsfb_pm_ops = {
458 	SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)
459 };
460 
461 static struct platform_driver mxsfb_platform_driver = {
462 	.probe		= mxsfb_probe,
463 	.remove		= mxsfb_remove,
464 	.id_table	= mxsfb_devtype,
465 	.driver	= {
466 		.name		= "mxsfb",
467 		.of_match_table	= mxsfb_dt_ids,
468 		.pm		= &mxsfb_pm_ops,
469 	},
470 };
471 
472 module_platform_driver(mxsfb_platform_driver);
473 
474 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
475 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
476 MODULE_LICENSE("GPL");
477