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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
41enum mxsfb_devtype {
42 MXSFB_V3,
43 MXSFB_V4,
44};
45
46static 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
67static const uint32_t mxsfb_formats[] = {
68 DRM_FORMAT_XRGB8888,
69 DRM_FORMAT_RGB565
70};
71
72static const uint64_t mxsfb_modifiers[] = {
73 DRM_FORMAT_MOD_LINEAR,
74 DRM_FORMAT_MOD_INVALID
75};
76
77static struct mxsfb_drm_private *
78drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe)
79{
80 return container_of(pipe, struct mxsfb_drm_private, pipe);
81}
82
83void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
84{
85 if (mxsfb->clk_axi)
86 clk_prepare_enable(mxsfb->clk_axi);
87}
88
89void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
90{
91 if (mxsfb->clk_axi)
92 clk_disable_unprepare(mxsfb->clk_axi);
93}
94
95static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
96 .fb_create = drm_gem_fb_create,
97 .atomic_check = drm_atomic_helper_check,
98 .atomic_commit = drm_atomic_helper_commit,
99};
100
101static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
102 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
103};
104
105static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
106 struct drm_crtc_state *crtc_state,
107 struct drm_plane_state *plane_state)
108{
109 struct drm_connector *connector;
110 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
111 struct drm_device *drm = pipe->plane.dev;
112
113 if (!mxsfb->connector) {
114 list_for_each_entry(connector,
115 &drm->mode_config.connector_list,
116 head)
117 if (connector->encoder == &mxsfb->pipe.encoder) {
118 mxsfb->connector = connector;
119 break;
120 }
121 }
122
123 if (!mxsfb->connector) {
124 dev_warn(drm->dev, "No connector attached, using default\n");
125 mxsfb->connector = &mxsfb->panel_connector;
126 }
127
128 pm_runtime_get_sync(drm->dev);
129 drm_panel_prepare(mxsfb->panel);
130 mxsfb_crtc_enable(mxsfb);
131 drm_panel_enable(mxsfb->panel);
132}
133
134static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
135{
136 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
137 struct drm_device *drm = pipe->plane.dev;
138 struct drm_crtc *crtc = &pipe->crtc;
139 struct drm_pending_vblank_event *event;
140
141 drm_panel_disable(mxsfb->panel);
142 mxsfb_crtc_disable(mxsfb);
143 drm_panel_unprepare(mxsfb->panel);
144 pm_runtime_put_sync(drm->dev);
145
146 spin_lock_irq(&drm->event_lock);
147 event = crtc->state->event;
148 if (event) {
149 crtc->state->event = NULL;
150 drm_crtc_send_vblank_event(crtc, event);
151 }
152 spin_unlock_irq(&drm->event_lock);
153
154 if (mxsfb->connector != &mxsfb->panel_connector)
155 mxsfb->connector = NULL;
156}
157
158static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
159 struct drm_plane_state *plane_state)
160{
161 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
162
163 mxsfb_plane_atomic_update(mxsfb, plane_state);
164}
165
166static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe)
167{
168 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
169
170 /* Clear and enable VBLANK IRQ */
171 mxsfb_enable_axi_clk(mxsfb);
172 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
173 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
174 mxsfb_disable_axi_clk(mxsfb);
175
176 return 0;
177}
178
179static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe)
180{
181 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
182
183 /* Disable and clear VBLANK IRQ */
184 mxsfb_enable_axi_clk(mxsfb);
185 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
186 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
187 mxsfb_disable_axi_clk(mxsfb);
188}
189
190static struct drm_simple_display_pipe_funcs mxsfb_funcs = {
191 .enable = mxsfb_pipe_enable,
192 .disable = mxsfb_pipe_disable,
193 .update = mxsfb_pipe_update,
194 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
195 .enable_vblank = mxsfb_pipe_enable_vblank,
196 .disable_vblank = mxsfb_pipe_disable_vblank,
197};
198
199static int mxsfb_load(struct drm_device *drm)
200{
201 struct platform_device *pdev = to_platform_device(drm->dev);
202 struct mxsfb_drm_private *mxsfb;
203 struct resource *res;
204 int ret;
205
206 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
207 if (!mxsfb)
208 return -ENOMEM;
209
210 drm->dev_private = mxsfb;
211 mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
212
213 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
214 mxsfb->base = devm_ioremap_resource(drm->dev, res);
215 if (IS_ERR(mxsfb->base))
216 return PTR_ERR(mxsfb->base);
217
218 mxsfb->clk = devm_clk_get(drm->dev, NULL);
219 if (IS_ERR(mxsfb->clk))
220 return PTR_ERR(mxsfb->clk);
221
222 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
223 if (IS_ERR(mxsfb->clk_axi))
224 mxsfb->clk_axi = NULL;
225
226 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
227 if (IS_ERR(mxsfb->clk_disp_axi))
228 mxsfb->clk_disp_axi = NULL;
229
230 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
231 if (ret)
232 return ret;
233
234 pm_runtime_enable(drm->dev);
235
236 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
237 if (ret < 0) {
238 dev_err(drm->dev, "Failed to initialise vblank\n");
239 goto err_vblank;
240 }
241
242 /* Modeset init */
243 drm_mode_config_init(drm);
244
245 ret = mxsfb_create_output(drm);
246 if (ret < 0) {
247 dev_err(drm->dev, "Failed to create outputs\n");
248 goto err_vblank;
249 }
250
251 ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
252 mxsfb_formats, ARRAY_SIZE(mxsfb_formats),
253 mxsfb_modifiers, mxsfb->connector);
254 if (ret < 0) {
255 dev_err(drm->dev, "Cannot setup simple display pipe\n");
256 goto err_vblank;
257 }
258
259 /*
260 * Attach panel only if there is one.
261 * If there is no panel attach, it must be a bridge. In this case, we
262 * need a reference to its connector for a proper initialization.
263 * We will do this check in pipe->enable(), since the connector won't
264 * be attached to an encoder until then.
265 */
266
267 if (mxsfb->panel) {
268 ret = drm_panel_attach(mxsfb->panel, mxsfb->connector);
269 if (ret) {
270 dev_err(drm->dev, "Cannot connect panel: %d\n", ret);
271 goto err_vblank;
272 }
273 } else if (mxsfb->bridge) {
274 ret = drm_simple_display_pipe_attach_bridge(&mxsfb->pipe,
275 mxsfb->bridge);
276 if (ret) {
277 dev_err(drm->dev, "Cannot connect bridge: %d\n", ret);
278 goto err_vblank;
279 }
280 }
281
282 drm->mode_config.min_width = MXSFB_MIN_XRES;
283 drm->mode_config.min_height = MXSFB_MIN_YRES;
284 drm->mode_config.max_width = MXSFB_MAX_XRES;
285 drm->mode_config.max_height = MXSFB_MAX_YRES;
286 drm->mode_config.funcs = &mxsfb_mode_config_funcs;
287 drm->mode_config.helper_private = &mxsfb_mode_config_helpers;
288
289 drm_mode_config_reset(drm);
290
291 pm_runtime_get_sync(drm->dev);
292 ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
293 pm_runtime_put_sync(drm->dev);
294
295 if (ret < 0) {
296 dev_err(drm->dev, "Failed to install IRQ handler\n");
297 goto err_irq;
298 }
299
300 drm_kms_helper_poll_init(drm);
301
302 platform_set_drvdata(pdev, drm);
303
304 drm_helper_hpd_irq_event(drm);
305
306 return 0;
307
308err_irq:
309 drm_panel_detach(mxsfb->panel);
310err_vblank:
311 pm_runtime_disable(drm->dev);
312
313 return ret;
314}
315
316static void mxsfb_unload(struct drm_device *drm)
317{
318 drm_kms_helper_poll_fini(drm);
319 drm_mode_config_cleanup(drm);
320
321 pm_runtime_get_sync(drm->dev);
322 drm_irq_uninstall(drm);
323 pm_runtime_put_sync(drm->dev);
324
325 drm->dev_private = NULL;
326
327 pm_runtime_disable(drm->dev);
328}
329
330static void mxsfb_irq_preinstall(struct drm_device *drm)
331{
332 struct mxsfb_drm_private *mxsfb = drm->dev_private;
333
334 mxsfb_pipe_disable_vblank(&mxsfb->pipe);
335}
336
337static irqreturn_t mxsfb_irq_handler(int irq, void *data)
338{
339 struct drm_device *drm = data;
340 struct mxsfb_drm_private *mxsfb = drm->dev_private;
341 u32 reg;
342
343 mxsfb_enable_axi_clk(mxsfb);
344
345 reg = readl(mxsfb->base + LCDC_CTRL1);
346
347 if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
348 drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
349
350 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
351
352 mxsfb_disable_axi_clk(mxsfb);
353
354 return IRQ_HANDLED;
355}
356
357DEFINE_DRM_GEM_CMA_FOPS(fops);
358
359static struct drm_driver mxsfb_driver = {
360 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
361 .irq_handler = mxsfb_irq_handler,
362 .irq_preinstall = mxsfb_irq_preinstall,
363 .irq_uninstall = mxsfb_irq_preinstall,
364 DRM_GEM_CMA_DRIVER_OPS,
365 .fops = &fops,
366 .name = "mxsfb-drm",
367 .desc = "MXSFB Controller DRM",
368 .date = "20160824",
369 .major = 1,
370 .minor = 0,
371};
372
373static const struct platform_device_id mxsfb_devtype[] = {
374 { .name = "imx23-fb", .driver_data = MXSFB_V3, },
375 { .name = "imx28-fb", .driver_data = MXSFB_V4, },
376 { .name = "imx6sx-fb", .driver_data = MXSFB_V4, },
377 { /* sentinel */ }
378};
379MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
380
381static const struct of_device_id mxsfb_dt_ids[] = {
382 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
383 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
384 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], },
385 { /* sentinel */ }
386};
387MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
388
389static int mxsfb_probe(struct platform_device *pdev)
390{
391 struct drm_device *drm;
392 const struct of_device_id *of_id =
393 of_match_device(mxsfb_dt_ids, &pdev->dev);
394 int ret;
395
396 if (!pdev->dev.of_node)
397 return -ENODEV;
398
399 if (of_id)
400 pdev->id_entry = of_id->data;
401
402 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
403 if (IS_ERR(drm))
404 return PTR_ERR(drm);
405
406 ret = mxsfb_load(drm);
407 if (ret)
408 goto err_free;
409
410 ret = drm_dev_register(drm, 0);
411 if (ret)
412 goto err_unload;
413
414 drm_fbdev_generic_setup(drm, 32);
415
416 return 0;
417
418err_unload:
419 mxsfb_unload(drm);
420err_free:
421 drm_dev_put(drm);
422
423 return ret;
424}
425
426static int mxsfb_remove(struct platform_device *pdev)
427{
428 struct drm_device *drm = platform_get_drvdata(pdev);
429
430 drm_dev_unregister(drm);
431 mxsfb_unload(drm);
432 drm_dev_put(drm);
433
434 return 0;
435}
436
437#ifdef CONFIG_PM_SLEEP
438static int mxsfb_suspend(struct device *dev)
439{
440 struct drm_device *drm = dev_get_drvdata(dev);
441
442 return drm_mode_config_helper_suspend(drm);
443}
444
445static int mxsfb_resume(struct device *dev)
446{
447 struct drm_device *drm = dev_get_drvdata(dev);
448
449 return drm_mode_config_helper_resume(drm);
450}
451#endif
452
453static const struct dev_pm_ops mxsfb_pm_ops = {
454 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)
455};
456
457static struct platform_driver mxsfb_platform_driver = {
458 .probe = mxsfb_probe,
459 .remove = mxsfb_remove,
460 .id_table = mxsfb_devtype,
461 .driver = {
462 .name = "mxsfb",
463 .of_match_table = mxsfb_dt_ids,
464 .pm = &mxsfb_pm_ops,
465 },
466};
467
468module_platform_driver(mxsfb_platform_driver);
469
470MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
471MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
472MODULE_LICENSE("GPL");