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1/*
2 * Copyright (C) 2016 Marek Vasut <marex@denx.de>
3 *
4 * This code is based on drivers/video/fbdev/mxsfb.c :
5 * Copyright (C) 2010 Juergen Beisert, Pengutronix
6 * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
7 * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19#include <linux/module.h>
20#include <linux/spinlock.h>
21#include <linux/clk.h>
22#include <linux/component.h>
23#include <linux/list.h>
24#include <linux/of_device.h>
25#include <linux/of_graph.h>
26#include <linux/of_reserved_mem.h>
27#include <linux/pm_runtime.h>
28#include <linux/reservation.h>
29
30#include <drm/drmP.h>
31#include <drm/drm_atomic.h>
32#include <drm/drm_atomic_helper.h>
33#include <drm/drm_crtc.h>
34#include <drm/drm_crtc_helper.h>
35#include <drm/drm_fb_helper.h>
36#include <drm/drm_fb_cma_helper.h>
37#include <drm/drm_gem_cma_helper.h>
38#include <drm/drm_of.h>
39#include <drm/drm_panel.h>
40#include <drm/drm_simple_kms_helper.h>
41
42#include "mxsfb_drv.h"
43#include "mxsfb_regs.h"
44
45enum mxsfb_devtype {
46 MXSFB_V3,
47 MXSFB_V4,
48};
49
50static const struct mxsfb_devdata mxsfb_devdata[] = {
51 [MXSFB_V3] = {
52 .transfer_count = LCDC_V3_TRANSFER_COUNT,
53 .cur_buf = LCDC_V3_CUR_BUF,
54 .next_buf = LCDC_V3_NEXT_BUF,
55 .debug0 = LCDC_V3_DEBUG0,
56 .hs_wdth_mask = 0xff,
57 .hs_wdth_shift = 24,
58 .ipversion = 3,
59 },
60 [MXSFB_V4] = {
61 .transfer_count = LCDC_V4_TRANSFER_COUNT,
62 .cur_buf = LCDC_V4_CUR_BUF,
63 .next_buf = LCDC_V4_NEXT_BUF,
64 .debug0 = LCDC_V4_DEBUG0,
65 .hs_wdth_mask = 0x3fff,
66 .hs_wdth_shift = 18,
67 .ipversion = 4,
68 },
69};
70
71static const uint32_t mxsfb_formats[] = {
72 DRM_FORMAT_XRGB8888,
73 DRM_FORMAT_RGB565
74};
75
76static struct mxsfb_drm_private *
77drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe)
78{
79 return container_of(pipe, struct mxsfb_drm_private, pipe);
80}
81
82void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
83{
84 if (mxsfb->clk_axi)
85 clk_prepare_enable(mxsfb->clk_axi);
86}
87
88void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
89{
90 if (mxsfb->clk_axi)
91 clk_disable_unprepare(mxsfb->clk_axi);
92}
93
94static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
95 .fb_create = drm_fb_cma_create,
96 .atomic_check = drm_atomic_helper_check,
97 .atomic_commit = drm_atomic_helper_commit,
98};
99
100static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
101 struct drm_crtc_state *crtc_state)
102{
103 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
104
105 mxsfb_crtc_enable(mxsfb);
106}
107
108static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
109{
110 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
111
112 mxsfb_crtc_disable(mxsfb);
113}
114
115static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
116 struct drm_plane_state *plane_state)
117{
118 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
119
120 mxsfb_plane_atomic_update(mxsfb, plane_state);
121}
122
123static int mxsfb_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
124 struct drm_plane_state *plane_state)
125{
126 return drm_fb_cma_prepare_fb(&pipe->plane, plane_state);
127}
128
129struct drm_simple_display_pipe_funcs mxsfb_funcs = {
130 .enable = mxsfb_pipe_enable,
131 .disable = mxsfb_pipe_disable,
132 .update = mxsfb_pipe_update,
133 .prepare_fb = mxsfb_pipe_prepare_fb,
134};
135
136static int mxsfb_load(struct drm_device *drm, unsigned long flags)
137{
138 struct platform_device *pdev = to_platform_device(drm->dev);
139 struct mxsfb_drm_private *mxsfb;
140 struct resource *res;
141 int ret;
142
143 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
144 if (!mxsfb)
145 return -ENOMEM;
146
147 drm->dev_private = mxsfb;
148 mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
149
150 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
151 mxsfb->base = devm_ioremap_resource(drm->dev, res);
152 if (IS_ERR(mxsfb->base))
153 return PTR_ERR(mxsfb->base);
154
155 mxsfb->clk = devm_clk_get(drm->dev, NULL);
156 if (IS_ERR(mxsfb->clk))
157 return PTR_ERR(mxsfb->clk);
158
159 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
160 if (IS_ERR(mxsfb->clk_axi))
161 mxsfb->clk_axi = NULL;
162
163 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
164 if (IS_ERR(mxsfb->clk_disp_axi))
165 mxsfb->clk_disp_axi = NULL;
166
167 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
168 if (ret)
169 return ret;
170
171 pm_runtime_enable(drm->dev);
172
173 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
174 if (ret < 0) {
175 dev_err(drm->dev, "Failed to initialise vblank\n");
176 goto err_vblank;
177 }
178
179 /* Modeset init */
180 drm_mode_config_init(drm);
181
182 ret = mxsfb_create_output(drm);
183 if (ret < 0) {
184 dev_err(drm->dev, "Failed to create outputs\n");
185 goto err_vblank;
186 }
187
188 ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
189 mxsfb_formats, ARRAY_SIZE(mxsfb_formats),
190 &mxsfb->connector);
191 if (ret < 0) {
192 dev_err(drm->dev, "Cannot setup simple display pipe\n");
193 goto err_vblank;
194 }
195
196 ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
197 if (ret) {
198 dev_err(drm->dev, "Cannot connect panel\n");
199 goto err_vblank;
200 }
201
202 drm->mode_config.min_width = MXSFB_MIN_XRES;
203 drm->mode_config.min_height = MXSFB_MIN_YRES;
204 drm->mode_config.max_width = MXSFB_MAX_XRES;
205 drm->mode_config.max_height = MXSFB_MAX_YRES;
206 drm->mode_config.funcs = &mxsfb_mode_config_funcs;
207
208 drm_mode_config_reset(drm);
209
210 pm_runtime_get_sync(drm->dev);
211 ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
212 pm_runtime_put_sync(drm->dev);
213
214 if (ret < 0) {
215 dev_err(drm->dev, "Failed to install IRQ handler\n");
216 goto err_irq;
217 }
218
219 drm_kms_helper_poll_init(drm);
220
221 mxsfb->fbdev = drm_fbdev_cma_init(drm, 32, drm->mode_config.num_crtc,
222 drm->mode_config.num_connector);
223 if (IS_ERR(mxsfb->fbdev)) {
224 mxsfb->fbdev = NULL;
225 dev_err(drm->dev, "Failed to init FB CMA area\n");
226 goto err_cma;
227 }
228
229 platform_set_drvdata(pdev, drm);
230
231 drm_helper_hpd_irq_event(drm);
232
233 return 0;
234
235err_cma:
236 drm_irq_uninstall(drm);
237err_irq:
238 drm_panel_detach(mxsfb->panel);
239err_vblank:
240 pm_runtime_disable(drm->dev);
241
242 return ret;
243}
244
245static void mxsfb_unload(struct drm_device *drm)
246{
247 struct mxsfb_drm_private *mxsfb = drm->dev_private;
248
249 if (mxsfb->fbdev)
250 drm_fbdev_cma_fini(mxsfb->fbdev);
251
252 drm_kms_helper_poll_fini(drm);
253 drm_mode_config_cleanup(drm);
254 drm_vblank_cleanup(drm);
255
256 pm_runtime_get_sync(drm->dev);
257 drm_irq_uninstall(drm);
258 pm_runtime_put_sync(drm->dev);
259
260 drm->dev_private = NULL;
261
262 pm_runtime_disable(drm->dev);
263}
264
265static void mxsfb_lastclose(struct drm_device *drm)
266{
267 struct mxsfb_drm_private *mxsfb = drm->dev_private;
268
269 drm_fbdev_cma_restore_mode(mxsfb->fbdev);
270}
271
272static int mxsfb_enable_vblank(struct drm_device *drm, unsigned int crtc)
273{
274 struct mxsfb_drm_private *mxsfb = drm->dev_private;
275
276 /* Clear and enable VBLANK IRQ */
277 mxsfb_enable_axi_clk(mxsfb);
278 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
279 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
280 mxsfb_disable_axi_clk(mxsfb);
281
282 return 0;
283}
284
285static void mxsfb_disable_vblank(struct drm_device *drm, unsigned int crtc)
286{
287 struct mxsfb_drm_private *mxsfb = drm->dev_private;
288
289 /* Disable and clear VBLANK IRQ */
290 mxsfb_enable_axi_clk(mxsfb);
291 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
292 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
293 mxsfb_disable_axi_clk(mxsfb);
294}
295
296static void mxsfb_irq_preinstall(struct drm_device *drm)
297{
298 mxsfb_disable_vblank(drm, 0);
299}
300
301static irqreturn_t mxsfb_irq_handler(int irq, void *data)
302{
303 struct drm_device *drm = data;
304 struct mxsfb_drm_private *mxsfb = drm->dev_private;
305 u32 reg;
306
307 mxsfb_enable_axi_clk(mxsfb);
308
309 reg = readl(mxsfb->base + LCDC_CTRL1);
310
311 if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
312 drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
313
314 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
315
316 mxsfb_disable_axi_clk(mxsfb);
317
318 return IRQ_HANDLED;
319}
320
321static const struct file_operations fops = {
322 .owner = THIS_MODULE,
323 .open = drm_open,
324 .release = drm_release,
325 .unlocked_ioctl = drm_ioctl,
326#ifdef CONFIG_COMPAT
327 .compat_ioctl = drm_compat_ioctl,
328#endif
329 .poll = drm_poll,
330 .read = drm_read,
331 .llseek = noop_llseek,
332 .mmap = drm_gem_cma_mmap,
333};
334
335static struct drm_driver mxsfb_driver = {
336 .driver_features = DRIVER_GEM | DRIVER_MODESET |
337 DRIVER_PRIME | DRIVER_ATOMIC |
338 DRIVER_HAVE_IRQ,
339 .lastclose = mxsfb_lastclose,
340 .irq_handler = mxsfb_irq_handler,
341 .irq_preinstall = mxsfb_irq_preinstall,
342 .irq_uninstall = mxsfb_irq_preinstall,
343 .get_vblank_counter = drm_vblank_no_hw_counter,
344 .enable_vblank = mxsfb_enable_vblank,
345 .disable_vblank = mxsfb_disable_vblank,
346 .gem_free_object = drm_gem_cma_free_object,
347 .gem_vm_ops = &drm_gem_cma_vm_ops,
348 .dumb_create = drm_gem_cma_dumb_create,
349 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
350 .dumb_destroy = drm_gem_dumb_destroy,
351 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
352 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
353 .gem_prime_export = drm_gem_prime_export,
354 .gem_prime_import = drm_gem_prime_import,
355 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
356 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
357 .gem_prime_vmap = drm_gem_cma_prime_vmap,
358 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
359 .gem_prime_mmap = drm_gem_cma_prime_mmap,
360 .fops = &fops,
361 .name = "mxsfb-drm",
362 .desc = "MXSFB Controller DRM",
363 .date = "20160824",
364 .major = 1,
365 .minor = 0,
366};
367
368static const struct platform_device_id mxsfb_devtype[] = {
369 { .name = "imx23-fb", .driver_data = MXSFB_V3, },
370 { .name = "imx28-fb", .driver_data = MXSFB_V4, },
371 { .name = "imx6sx-fb", .driver_data = MXSFB_V4, },
372 { /* sentinel */ }
373};
374MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
375
376static const struct of_device_id mxsfb_dt_ids[] = {
377 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
378 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
379 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], },
380 { /* sentinel */ }
381};
382MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
383
384static int mxsfb_probe(struct platform_device *pdev)
385{
386 struct drm_device *drm;
387 const struct of_device_id *of_id =
388 of_match_device(mxsfb_dt_ids, &pdev->dev);
389 int ret;
390
391 if (!pdev->dev.of_node)
392 return -ENODEV;
393
394 if (of_id)
395 pdev->id_entry = of_id->data;
396
397 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
398 if (!drm)
399 return -ENOMEM;
400
401 ret = mxsfb_load(drm, 0);
402 if (ret)
403 goto err_free;
404
405 ret = drm_dev_register(drm, 0);
406 if (ret)
407 goto err_unload;
408
409 return 0;
410
411err_unload:
412 mxsfb_unload(drm);
413err_free:
414 drm_dev_unref(drm);
415
416 return ret;
417}
418
419static int mxsfb_remove(struct platform_device *pdev)
420{
421 struct drm_device *drm = platform_get_drvdata(pdev);
422
423 drm_dev_unregister(drm);
424 mxsfb_unload(drm);
425 drm_dev_unref(drm);
426
427 return 0;
428}
429
430static struct platform_driver mxsfb_platform_driver = {
431 .probe = mxsfb_probe,
432 .remove = mxsfb_remove,
433 .id_table = mxsfb_devtype,
434 .driver = {
435 .name = "mxsfb",
436 .of_match_table = mxsfb_dt_ids,
437 },
438};
439
440module_platform_driver(mxsfb_platform_driver);
441
442MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
443MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
444MODULE_LICENSE("GPL");