Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
/*
 * Copyright (C) 2016 Marek Vasut <marex@denx.de>
 *
 * This code is based on drivers/video/fbdev/mxsfb.c :
 * Copyright (C) 2010 Juergen Beisert, Pengutronix
 * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/list.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>
#include <linux/pm_runtime.h>
#include <linux/reservation.h>

#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_simple_kms_helper.h>

#include "mxsfb_drv.h"
#include "mxsfb_regs.h"

enum mxsfb_devtype {
	MXSFB_V3,
	MXSFB_V4,
};

static const struct mxsfb_devdata mxsfb_devdata[] = {
	[MXSFB_V3] = {
		.transfer_count	= LCDC_V3_TRANSFER_COUNT,
		.cur_buf	= LCDC_V3_CUR_BUF,
		.next_buf	= LCDC_V3_NEXT_BUF,
		.debug0		= LCDC_V3_DEBUG0,
		.hs_wdth_mask	= 0xff,
		.hs_wdth_shift	= 24,
		.ipversion	= 3,
	},
	[MXSFB_V4] = {
		.transfer_count	= LCDC_V4_TRANSFER_COUNT,
		.cur_buf	= LCDC_V4_CUR_BUF,
		.next_buf	= LCDC_V4_NEXT_BUF,
		.debug0		= LCDC_V4_DEBUG0,
		.hs_wdth_mask	= 0x3fff,
		.hs_wdth_shift	= 18,
		.ipversion	= 4,
	},
};

static const uint32_t mxsfb_formats[] = {
	DRM_FORMAT_XRGB8888,
	DRM_FORMAT_RGB565
};

static struct mxsfb_drm_private *
drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe)
{
	return container_of(pipe, struct mxsfb_drm_private, pipe);
}

void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
{
	if (mxsfb->clk_axi)
		clk_prepare_enable(mxsfb->clk_axi);
}

void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
{
	if (mxsfb->clk_axi)
		clk_disable_unprepare(mxsfb->clk_axi);
}

static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
	.fb_create		= drm_fb_cma_create,
	.atomic_check		= drm_atomic_helper_check,
	.atomic_commit		= drm_atomic_helper_commit,
};

static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
			      struct drm_crtc_state *crtc_state)
{
	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);

	drm_panel_prepare(mxsfb->panel);
	mxsfb_crtc_enable(mxsfb);
	drm_panel_enable(mxsfb->panel);
}

static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
{
	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);

	drm_panel_disable(mxsfb->panel);
	mxsfb_crtc_disable(mxsfb);
	drm_panel_unprepare(mxsfb->panel);
}

static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
			      struct drm_plane_state *plane_state)
{
	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);

	mxsfb_plane_atomic_update(mxsfb, plane_state);
}

static int mxsfb_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
				 struct drm_plane_state *plane_state)
{
	return drm_fb_cma_prepare_fb(&pipe->plane, plane_state);
}

static struct drm_simple_display_pipe_funcs mxsfb_funcs = {
	.enable		= mxsfb_pipe_enable,
	.disable	= mxsfb_pipe_disable,
	.update		= mxsfb_pipe_update,
	.prepare_fb	= mxsfb_pipe_prepare_fb,
};

static int mxsfb_load(struct drm_device *drm, unsigned long flags)
{
	struct platform_device *pdev = to_platform_device(drm->dev);
	struct mxsfb_drm_private *mxsfb;
	struct resource *res;
	int ret;

	mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
	if (!mxsfb)
		return -ENOMEM;

	drm->dev_private = mxsfb;
	mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	mxsfb->base = devm_ioremap_resource(drm->dev, res);
	if (IS_ERR(mxsfb->base))
		return PTR_ERR(mxsfb->base);

	mxsfb->clk = devm_clk_get(drm->dev, NULL);
	if (IS_ERR(mxsfb->clk))
		return PTR_ERR(mxsfb->clk);

	mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
	if (IS_ERR(mxsfb->clk_axi))
		mxsfb->clk_axi = NULL;

	mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
	if (IS_ERR(mxsfb->clk_disp_axi))
		mxsfb->clk_disp_axi = NULL;

	ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	pm_runtime_enable(drm->dev);

	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
	if (ret < 0) {
		dev_err(drm->dev, "Failed to initialise vblank\n");
		goto err_vblank;
	}

	/* Modeset init */
	drm_mode_config_init(drm);

	ret = mxsfb_create_output(drm);
	if (ret < 0) {
		dev_err(drm->dev, "Failed to create outputs\n");
		goto err_vblank;
	}

	ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
			mxsfb_formats, ARRAY_SIZE(mxsfb_formats),
			&mxsfb->connector);
	if (ret < 0) {
		dev_err(drm->dev, "Cannot setup simple display pipe\n");
		goto err_vblank;
	}

	ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
	if (ret) {
		dev_err(drm->dev, "Cannot connect panel\n");
		goto err_vblank;
	}

	drm->mode_config.min_width	= MXSFB_MIN_XRES;
	drm->mode_config.min_height	= MXSFB_MIN_YRES;
	drm->mode_config.max_width	= MXSFB_MAX_XRES;
	drm->mode_config.max_height	= MXSFB_MAX_YRES;
	drm->mode_config.funcs		= &mxsfb_mode_config_funcs;

	drm_mode_config_reset(drm);

	pm_runtime_get_sync(drm->dev);
	ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
	pm_runtime_put_sync(drm->dev);

	if (ret < 0) {
		dev_err(drm->dev, "Failed to install IRQ handler\n");
		goto err_irq;
	}

	drm_kms_helper_poll_init(drm);

	mxsfb->fbdev = drm_fbdev_cma_init(drm, 32,
					  drm->mode_config.num_connector);
	if (IS_ERR(mxsfb->fbdev)) {
		ret = PTR_ERR(mxsfb->fbdev);
		mxsfb->fbdev = NULL;
		dev_err(drm->dev, "Failed to init FB CMA area\n");
		goto err_cma;
	}

	platform_set_drvdata(pdev, drm);

	drm_helper_hpd_irq_event(drm);

	return 0;

err_cma:
	drm_irq_uninstall(drm);
err_irq:
	drm_panel_detach(mxsfb->panel);
err_vblank:
	pm_runtime_disable(drm->dev);

	return ret;
}

static void mxsfb_unload(struct drm_device *drm)
{
	struct mxsfb_drm_private *mxsfb = drm->dev_private;

	if (mxsfb->fbdev)
		drm_fbdev_cma_fini(mxsfb->fbdev);

	drm_kms_helper_poll_fini(drm);
	drm_mode_config_cleanup(drm);
	drm_vblank_cleanup(drm);

	pm_runtime_get_sync(drm->dev);
	drm_irq_uninstall(drm);
	pm_runtime_put_sync(drm->dev);

	drm->dev_private = NULL;

	pm_runtime_disable(drm->dev);
}

static void mxsfb_lastclose(struct drm_device *drm)
{
	struct mxsfb_drm_private *mxsfb = drm->dev_private;

	drm_fbdev_cma_restore_mode(mxsfb->fbdev);
}

static int mxsfb_enable_vblank(struct drm_device *drm, unsigned int crtc)
{
	struct mxsfb_drm_private *mxsfb = drm->dev_private;

	/* Clear and enable VBLANK IRQ */
	mxsfb_enable_axi_clk(mxsfb);
	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
	writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
	mxsfb_disable_axi_clk(mxsfb);

	return 0;
}

static void mxsfb_disable_vblank(struct drm_device *drm, unsigned int crtc)
{
	struct mxsfb_drm_private *mxsfb = drm->dev_private;

	/* Disable and clear VBLANK IRQ */
	mxsfb_enable_axi_clk(mxsfb);
	writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
	mxsfb_disable_axi_clk(mxsfb);
}

static void mxsfb_irq_preinstall(struct drm_device *drm)
{
	mxsfb_disable_vblank(drm, 0);
}

static irqreturn_t mxsfb_irq_handler(int irq, void *data)
{
	struct drm_device *drm = data;
	struct mxsfb_drm_private *mxsfb = drm->dev_private;
	u32 reg;

	mxsfb_enable_axi_clk(mxsfb);

	reg = readl(mxsfb->base + LCDC_CTRL1);

	if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
		drm_crtc_handle_vblank(&mxsfb->pipe.crtc);

	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);

	mxsfb_disable_axi_clk(mxsfb);

	return IRQ_HANDLED;
}

DEFINE_DRM_GEM_CMA_FOPS(fops);

static struct drm_driver mxsfb_driver = {
	.driver_features	= DRIVER_GEM | DRIVER_MODESET |
				  DRIVER_PRIME | DRIVER_ATOMIC |
				  DRIVER_HAVE_IRQ,
	.lastclose		= mxsfb_lastclose,
	.irq_handler		= mxsfb_irq_handler,
	.irq_preinstall		= mxsfb_irq_preinstall,
	.irq_uninstall		= mxsfb_irq_preinstall,
	.enable_vblank		= mxsfb_enable_vblank,
	.disable_vblank		= mxsfb_disable_vblank,
	.gem_free_object	= drm_gem_cma_free_object,
	.gem_vm_ops		= &drm_gem_cma_vm_ops,
	.dumb_create		= drm_gem_cma_dumb_create,
	.dumb_map_offset	= drm_gem_cma_dumb_map_offset,
	.dumb_destroy		= drm_gem_dumb_destroy,
	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
	.gem_prime_export	= drm_gem_prime_export,
	.gem_prime_import	= drm_gem_prime_import,
	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
	.fops	= &fops,
	.name	= "mxsfb-drm",
	.desc	= "MXSFB Controller DRM",
	.date	= "20160824",
	.major	= 1,
	.minor	= 0,
};

static const struct platform_device_id mxsfb_devtype[] = {
	{ .name = "imx23-fb", .driver_data = MXSFB_V3, },
	{ .name = "imx28-fb", .driver_data = MXSFB_V4, },
	{ .name = "imx6sx-fb", .driver_data = MXSFB_V4, },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, mxsfb_devtype);

static const struct of_device_id mxsfb_dt_ids[] = {
	{ .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
	{ .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
	{ .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);

static int mxsfb_probe(struct platform_device *pdev)
{
	struct drm_device *drm;
	const struct of_device_id *of_id =
			of_match_device(mxsfb_dt_ids, &pdev->dev);
	int ret;

	if (!pdev->dev.of_node)
		return -ENODEV;

	if (of_id)
		pdev->id_entry = of_id->data;

	drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
	if (IS_ERR(drm))
		return PTR_ERR(drm);

	ret = mxsfb_load(drm, 0);
	if (ret)
		goto err_free;

	ret = drm_dev_register(drm, 0);
	if (ret)
		goto err_unload;

	return 0;

err_unload:
	mxsfb_unload(drm);
err_free:
	drm_dev_unref(drm);

	return ret;
}

static int mxsfb_remove(struct platform_device *pdev)
{
	struct drm_device *drm = platform_get_drvdata(pdev);

	drm_dev_unregister(drm);
	mxsfb_unload(drm);
	drm_dev_unref(drm);

	return 0;
}

static struct platform_driver mxsfb_platform_driver = {
	.probe		= mxsfb_probe,
	.remove		= mxsfb_remove,
	.id_table	= mxsfb_devtype,
	.driver	= {
		.name		= "mxsfb",
		.of_match_table	= mxsfb_dt_ids,
	},
};

module_platform_driver(mxsfb_platform_driver);

MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
MODULE_LICENSE("GPL");