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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_gem_framebuffer_helper.h>
39#include <drm/drm_of.h>
40#include <drm/drm_panel.h>
41#include <drm/drm_simple_kms_helper.h>
42
43#include "mxsfb_drv.h"
44#include "mxsfb_regs.h"
45
46enum mxsfb_devtype {
47 MXSFB_V3,
48 MXSFB_V4,
49};
50
51static const struct mxsfb_devdata mxsfb_devdata[] = {
52 [MXSFB_V3] = {
53 .transfer_count = LCDC_V3_TRANSFER_COUNT,
54 .cur_buf = LCDC_V3_CUR_BUF,
55 .next_buf = LCDC_V3_NEXT_BUF,
56 .debug0 = LCDC_V3_DEBUG0,
57 .hs_wdth_mask = 0xff,
58 .hs_wdth_shift = 24,
59 .ipversion = 3,
60 },
61 [MXSFB_V4] = {
62 .transfer_count = LCDC_V4_TRANSFER_COUNT,
63 .cur_buf = LCDC_V4_CUR_BUF,
64 .next_buf = LCDC_V4_NEXT_BUF,
65 .debug0 = LCDC_V4_DEBUG0,
66 .hs_wdth_mask = 0x3fff,
67 .hs_wdth_shift = 18,
68 .ipversion = 4,
69 },
70};
71
72static const uint32_t mxsfb_formats[] = {
73 DRM_FORMAT_XRGB8888,
74 DRM_FORMAT_RGB565
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 void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
102 struct drm_crtc_state *crtc_state)
103{
104 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
105
106 drm_panel_prepare(mxsfb->panel);
107 mxsfb_crtc_enable(mxsfb);
108 drm_panel_enable(mxsfb->panel);
109}
110
111static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
112{
113 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
114
115 drm_panel_disable(mxsfb->panel);
116 mxsfb_crtc_disable(mxsfb);
117 drm_panel_unprepare(mxsfb->panel);
118}
119
120static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
121 struct drm_plane_state *plane_state)
122{
123 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
124
125 mxsfb_plane_atomic_update(mxsfb, plane_state);
126}
127
128static int mxsfb_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
129 struct drm_plane_state *plane_state)
130{
131 return drm_gem_fb_prepare_fb(&pipe->plane, plane_state);
132}
133
134static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe)
135{
136 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
137
138 /* Clear and enable VBLANK IRQ */
139 mxsfb_enable_axi_clk(mxsfb);
140 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
141 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
142 mxsfb_disable_axi_clk(mxsfb);
143
144 return 0;
145}
146
147static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe)
148{
149 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
150
151 /* Disable and clear VBLANK IRQ */
152 mxsfb_enable_axi_clk(mxsfb);
153 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
154 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
155 mxsfb_disable_axi_clk(mxsfb);
156}
157
158static struct drm_simple_display_pipe_funcs mxsfb_funcs = {
159 .enable = mxsfb_pipe_enable,
160 .disable = mxsfb_pipe_disable,
161 .update = mxsfb_pipe_update,
162 .prepare_fb = mxsfb_pipe_prepare_fb,
163 .enable_vblank = mxsfb_pipe_enable_vblank,
164 .disable_vblank = mxsfb_pipe_disable_vblank,
165};
166
167static int mxsfb_load(struct drm_device *drm, unsigned long flags)
168{
169 struct platform_device *pdev = to_platform_device(drm->dev);
170 struct mxsfb_drm_private *mxsfb;
171 struct resource *res;
172 int ret;
173
174 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
175 if (!mxsfb)
176 return -ENOMEM;
177
178 drm->dev_private = mxsfb;
179 mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
180
181 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
182 mxsfb->base = devm_ioremap_resource(drm->dev, res);
183 if (IS_ERR(mxsfb->base))
184 return PTR_ERR(mxsfb->base);
185
186 mxsfb->clk = devm_clk_get(drm->dev, NULL);
187 if (IS_ERR(mxsfb->clk))
188 return PTR_ERR(mxsfb->clk);
189
190 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
191 if (IS_ERR(mxsfb->clk_axi))
192 mxsfb->clk_axi = NULL;
193
194 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
195 if (IS_ERR(mxsfb->clk_disp_axi))
196 mxsfb->clk_disp_axi = NULL;
197
198 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
199 if (ret)
200 return ret;
201
202 pm_runtime_enable(drm->dev);
203
204 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
205 if (ret < 0) {
206 dev_err(drm->dev, "Failed to initialise vblank\n");
207 goto err_vblank;
208 }
209
210 /* Modeset init */
211 drm_mode_config_init(drm);
212
213 ret = mxsfb_create_output(drm);
214 if (ret < 0) {
215 dev_err(drm->dev, "Failed to create outputs\n");
216 goto err_vblank;
217 }
218
219 ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
220 mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL,
221 &mxsfb->connector);
222 if (ret < 0) {
223 dev_err(drm->dev, "Cannot setup simple display pipe\n");
224 goto err_vblank;
225 }
226
227 ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
228 if (ret) {
229 dev_err(drm->dev, "Cannot connect panel\n");
230 goto err_vblank;
231 }
232
233 drm->mode_config.min_width = MXSFB_MIN_XRES;
234 drm->mode_config.min_height = MXSFB_MIN_YRES;
235 drm->mode_config.max_width = MXSFB_MAX_XRES;
236 drm->mode_config.max_height = MXSFB_MAX_YRES;
237 drm->mode_config.funcs = &mxsfb_mode_config_funcs;
238
239 drm_mode_config_reset(drm);
240
241 pm_runtime_get_sync(drm->dev);
242 ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
243 pm_runtime_put_sync(drm->dev);
244
245 if (ret < 0) {
246 dev_err(drm->dev, "Failed to install IRQ handler\n");
247 goto err_irq;
248 }
249
250 drm_kms_helper_poll_init(drm);
251
252 mxsfb->fbdev = drm_fbdev_cma_init(drm, 32,
253 drm->mode_config.num_connector);
254 if (IS_ERR(mxsfb->fbdev)) {
255 ret = PTR_ERR(mxsfb->fbdev);
256 mxsfb->fbdev = NULL;
257 dev_err(drm->dev, "Failed to init FB CMA area\n");
258 goto err_cma;
259 }
260
261 platform_set_drvdata(pdev, drm);
262
263 drm_helper_hpd_irq_event(drm);
264
265 return 0;
266
267err_cma:
268 drm_irq_uninstall(drm);
269err_irq:
270 drm_panel_detach(mxsfb->panel);
271err_vblank:
272 pm_runtime_disable(drm->dev);
273
274 return ret;
275}
276
277static void mxsfb_unload(struct drm_device *drm)
278{
279 struct mxsfb_drm_private *mxsfb = drm->dev_private;
280
281 if (mxsfb->fbdev)
282 drm_fbdev_cma_fini(mxsfb->fbdev);
283
284 drm_kms_helper_poll_fini(drm);
285 drm_mode_config_cleanup(drm);
286
287 pm_runtime_get_sync(drm->dev);
288 drm_irq_uninstall(drm);
289 pm_runtime_put_sync(drm->dev);
290
291 drm->dev_private = NULL;
292
293 pm_runtime_disable(drm->dev);
294}
295
296static void mxsfb_lastclose(struct drm_device *drm)
297{
298 struct mxsfb_drm_private *mxsfb = drm->dev_private;
299
300 drm_fbdev_cma_restore_mode(mxsfb->fbdev);
301}
302
303static void mxsfb_irq_preinstall(struct drm_device *drm)
304{
305 struct mxsfb_drm_private *mxsfb = drm->dev_private;
306
307 mxsfb_pipe_disable_vblank(&mxsfb->pipe);
308}
309
310static irqreturn_t mxsfb_irq_handler(int irq, void *data)
311{
312 struct drm_device *drm = data;
313 struct mxsfb_drm_private *mxsfb = drm->dev_private;
314 u32 reg;
315
316 mxsfb_enable_axi_clk(mxsfb);
317
318 reg = readl(mxsfb->base + LCDC_CTRL1);
319
320 if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
321 drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
322
323 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
324
325 mxsfb_disable_axi_clk(mxsfb);
326
327 return IRQ_HANDLED;
328}
329
330DEFINE_DRM_GEM_CMA_FOPS(fops);
331
332static struct drm_driver mxsfb_driver = {
333 .driver_features = DRIVER_GEM | DRIVER_MODESET |
334 DRIVER_PRIME | DRIVER_ATOMIC |
335 DRIVER_HAVE_IRQ,
336 .lastclose = mxsfb_lastclose,
337 .irq_handler = mxsfb_irq_handler,
338 .irq_preinstall = mxsfb_irq_preinstall,
339 .irq_uninstall = mxsfb_irq_preinstall,
340 .gem_free_object_unlocked = drm_gem_cma_free_object,
341 .gem_vm_ops = &drm_gem_cma_vm_ops,
342 .dumb_create = drm_gem_cma_dumb_create,
343 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
344 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
345 .gem_prime_export = drm_gem_prime_export,
346 .gem_prime_import = drm_gem_prime_import,
347 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
348 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
349 .gem_prime_vmap = drm_gem_cma_prime_vmap,
350 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
351 .gem_prime_mmap = drm_gem_cma_prime_mmap,
352 .fops = &fops,
353 .name = "mxsfb-drm",
354 .desc = "MXSFB Controller DRM",
355 .date = "20160824",
356 .major = 1,
357 .minor = 0,
358};
359
360static const struct platform_device_id mxsfb_devtype[] = {
361 { .name = "imx23-fb", .driver_data = MXSFB_V3, },
362 { .name = "imx28-fb", .driver_data = MXSFB_V4, },
363 { .name = "imx6sx-fb", .driver_data = MXSFB_V4, },
364 { /* sentinel */ }
365};
366MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
367
368static const struct of_device_id mxsfb_dt_ids[] = {
369 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
370 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
371 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], },
372 { /* sentinel */ }
373};
374MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
375
376static int mxsfb_probe(struct platform_device *pdev)
377{
378 struct drm_device *drm;
379 const struct of_device_id *of_id =
380 of_match_device(mxsfb_dt_ids, &pdev->dev);
381 int ret;
382
383 if (!pdev->dev.of_node)
384 return -ENODEV;
385
386 if (of_id)
387 pdev->id_entry = of_id->data;
388
389 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
390 if (IS_ERR(drm))
391 return PTR_ERR(drm);
392
393 ret = mxsfb_load(drm, 0);
394 if (ret)
395 goto err_free;
396
397 ret = drm_dev_register(drm, 0);
398 if (ret)
399 goto err_unload;
400
401 return 0;
402
403err_unload:
404 mxsfb_unload(drm);
405err_free:
406 drm_dev_unref(drm);
407
408 return ret;
409}
410
411static int mxsfb_remove(struct platform_device *pdev)
412{
413 struct drm_device *drm = platform_get_drvdata(pdev);
414
415 drm_dev_unregister(drm);
416 mxsfb_unload(drm);
417 drm_dev_unref(drm);
418
419 return 0;
420}
421
422static struct platform_driver mxsfb_platform_driver = {
423 .probe = mxsfb_probe,
424 .remove = mxsfb_remove,
425 .id_table = mxsfb_devtype,
426 .driver = {
427 .name = "mxsfb",
428 .of_match_table = mxsfb_dt_ids,
429 },
430};
431
432module_platform_driver(mxsfb_platform_driver);
433
434MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
435MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
436MODULE_LICENSE("GPL");