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1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/clk.h>
4#include <linux/of_clk.h>
5#include <linux/platform_data/simplefb.h>
6#include <linux/platform_device.h>
7#include <linux/regulator/consumer.h>
8
9#include <drm/drm_aperture.h>
10#include <drm/drm_atomic_state_helper.h>
11#include <drm/drm_connector.h>
12#include <drm/drm_damage_helper.h>
13#include <drm/drm_device.h>
14#include <drm/drm_drv.h>
15#include <drm/drm_fb_helper.h>
16#include <drm/drm_format_helper.h>
17#include <drm/drm_gem_atomic_helper.h>
18#include <drm/drm_gem_framebuffer_helper.h>
19#include <drm/drm_gem_shmem_helper.h>
20#include <drm/drm_managed.h>
21#include <drm/drm_modeset_helper_vtables.h>
22#include <drm/drm_probe_helper.h>
23#include <drm/drm_simple_kms_helper.h>
24
25#define DRIVER_NAME "simpledrm"
26#define DRIVER_DESC "DRM driver for simple-framebuffer platform devices"
27#define DRIVER_DATE "20200625"
28#define DRIVER_MAJOR 1
29#define DRIVER_MINOR 0
30
31/*
32 * Assume a monitor resolution of 96 dpi to
33 * get a somewhat reasonable screen size.
34 */
35#define RES_MM(d) \
36 (((d) * 254ul) / (96ul * 10ul))
37
38#define SIMPLEDRM_MODE(hd, vd) \
39 DRM_SIMPLE_MODE(hd, vd, RES_MM(hd), RES_MM(vd))
40
41/*
42 * Helpers for simplefb
43 */
44
45static int
46simplefb_get_validated_int(struct drm_device *dev, const char *name,
47 uint32_t value)
48{
49 if (value > INT_MAX) {
50 drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
51 name, value);
52 return -EINVAL;
53 }
54 return (int)value;
55}
56
57static int
58simplefb_get_validated_int0(struct drm_device *dev, const char *name,
59 uint32_t value)
60{
61 if (!value) {
62 drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
63 name, value);
64 return -EINVAL;
65 }
66 return simplefb_get_validated_int(dev, name, value);
67}
68
69static const struct drm_format_info *
70simplefb_get_validated_format(struct drm_device *dev, const char *format_name)
71{
72 static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
73 const struct simplefb_format *fmt = formats;
74 const struct simplefb_format *end = fmt + ARRAY_SIZE(formats);
75 const struct drm_format_info *info;
76
77 if (!format_name) {
78 drm_err(dev, "simplefb: missing framebuffer format\n");
79 return ERR_PTR(-EINVAL);
80 }
81
82 while (fmt < end) {
83 if (!strcmp(format_name, fmt->name)) {
84 info = drm_format_info(fmt->fourcc);
85 if (!info)
86 return ERR_PTR(-EINVAL);
87 return info;
88 }
89 ++fmt;
90 }
91
92 drm_err(dev, "simplefb: unknown framebuffer format %s\n",
93 format_name);
94
95 return ERR_PTR(-EINVAL);
96}
97
98static int
99simplefb_get_width_pd(struct drm_device *dev,
100 const struct simplefb_platform_data *pd)
101{
102 return simplefb_get_validated_int0(dev, "width", pd->width);
103}
104
105static int
106simplefb_get_height_pd(struct drm_device *dev,
107 const struct simplefb_platform_data *pd)
108{
109 return simplefb_get_validated_int0(dev, "height", pd->height);
110}
111
112static int
113simplefb_get_stride_pd(struct drm_device *dev,
114 const struct simplefb_platform_data *pd)
115{
116 return simplefb_get_validated_int(dev, "stride", pd->stride);
117}
118
119static const struct drm_format_info *
120simplefb_get_format_pd(struct drm_device *dev,
121 const struct simplefb_platform_data *pd)
122{
123 return simplefb_get_validated_format(dev, pd->format);
124}
125
126static int
127simplefb_read_u32_of(struct drm_device *dev, struct device_node *of_node,
128 const char *name, u32 *value)
129{
130 int ret = of_property_read_u32(of_node, name, value);
131
132 if (ret)
133 drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
134 name, ret);
135 return ret;
136}
137
138static int
139simplefb_read_string_of(struct drm_device *dev, struct device_node *of_node,
140 const char *name, const char **value)
141{
142 int ret = of_property_read_string(of_node, name, value);
143
144 if (ret)
145 drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
146 name, ret);
147 return ret;
148}
149
150static int
151simplefb_get_width_of(struct drm_device *dev, struct device_node *of_node)
152{
153 u32 width;
154 int ret = simplefb_read_u32_of(dev, of_node, "width", &width);
155
156 if (ret)
157 return ret;
158 return simplefb_get_validated_int0(dev, "width", width);
159}
160
161static int
162simplefb_get_height_of(struct drm_device *dev, struct device_node *of_node)
163{
164 u32 height;
165 int ret = simplefb_read_u32_of(dev, of_node, "height", &height);
166
167 if (ret)
168 return ret;
169 return simplefb_get_validated_int0(dev, "height", height);
170}
171
172static int
173simplefb_get_stride_of(struct drm_device *dev, struct device_node *of_node)
174{
175 u32 stride;
176 int ret = simplefb_read_u32_of(dev, of_node, "stride", &stride);
177
178 if (ret)
179 return ret;
180 return simplefb_get_validated_int(dev, "stride", stride);
181}
182
183static const struct drm_format_info *
184simplefb_get_format_of(struct drm_device *dev, struct device_node *of_node)
185{
186 const char *format;
187 int ret = simplefb_read_string_of(dev, of_node, "format", &format);
188
189 if (ret)
190 return ERR_PTR(ret);
191 return simplefb_get_validated_format(dev, format);
192}
193
194/*
195 * Simple Framebuffer device
196 */
197
198struct simpledrm_device {
199 struct drm_device dev;
200 struct platform_device *pdev;
201
202 /* clocks */
203#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
204 unsigned int clk_count;
205 struct clk **clks;
206#endif
207 /* regulators */
208#if defined CONFIG_OF && defined CONFIG_REGULATOR
209 unsigned int regulator_count;
210 struct regulator **regulators;
211#endif
212
213 /* simplefb settings */
214 struct drm_display_mode mode;
215 const struct drm_format_info *format;
216 unsigned int pitch;
217
218 /* memory management */
219 struct resource *mem;
220 void __iomem *screen_base;
221
222 /* modesetting */
223 uint32_t formats[8];
224 size_t nformats;
225 struct drm_connector connector;
226 struct drm_simple_display_pipe pipe;
227};
228
229static struct simpledrm_device *simpledrm_device_of_dev(struct drm_device *dev)
230{
231 return container_of(dev, struct simpledrm_device, dev);
232}
233
234/*
235 * Hardware
236 */
237
238#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
239/*
240 * Clock handling code.
241 *
242 * Here we handle the clocks property of our "simple-framebuffer" dt node.
243 * This is necessary so that we can make sure that any clocks needed by
244 * the display engine that the bootloader set up for us (and for which it
245 * provided a simplefb dt node), stay up, for the life of the simplefb
246 * driver.
247 *
248 * When the driver unloads, we cleanly disable, and then release the clocks.
249 *
250 * We only complain about errors here, no action is taken as the most likely
251 * error can only happen due to a mismatch between the bootloader which set
252 * up simplefb, and the clock definitions in the device tree. Chances are
253 * that there are no adverse effects, and if there are, a clean teardown of
254 * the fb probe will not help us much either. So just complain and carry on,
255 * and hope that the user actually gets a working fb at the end of things.
256 */
257
258static void simpledrm_device_release_clocks(void *res)
259{
260 struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
261 unsigned int i;
262
263 for (i = 0; i < sdev->clk_count; ++i) {
264 if (sdev->clks[i]) {
265 clk_disable_unprepare(sdev->clks[i]);
266 clk_put(sdev->clks[i]);
267 }
268 }
269}
270
271static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
272{
273 struct drm_device *dev = &sdev->dev;
274 struct platform_device *pdev = sdev->pdev;
275 struct device_node *of_node = pdev->dev.of_node;
276 struct clk *clock;
277 unsigned int i;
278 int ret;
279
280 if (dev_get_platdata(&pdev->dev) || !of_node)
281 return 0;
282
283 sdev->clk_count = of_clk_get_parent_count(of_node);
284 if (!sdev->clk_count)
285 return 0;
286
287 sdev->clks = drmm_kzalloc(dev, sdev->clk_count * sizeof(sdev->clks[0]),
288 GFP_KERNEL);
289 if (!sdev->clks)
290 return -ENOMEM;
291
292 for (i = 0; i < sdev->clk_count; ++i) {
293 clock = of_clk_get(of_node, i);
294 if (IS_ERR(clock)) {
295 ret = PTR_ERR(clock);
296 if (ret == -EPROBE_DEFER)
297 goto err;
298 drm_err(dev, "clock %u not found: %d\n", i, ret);
299 continue;
300 }
301 ret = clk_prepare_enable(clock);
302 if (ret) {
303 drm_err(dev, "failed to enable clock %u: %d\n",
304 i, ret);
305 clk_put(clock);
306 continue;
307 }
308 sdev->clks[i] = clock;
309 }
310
311 return devm_add_action_or_reset(&pdev->dev,
312 simpledrm_device_release_clocks,
313 sdev);
314
315err:
316 while (i) {
317 --i;
318 if (sdev->clks[i]) {
319 clk_disable_unprepare(sdev->clks[i]);
320 clk_put(sdev->clks[i]);
321 }
322 }
323 return ret;
324}
325#else
326static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
327{
328 return 0;
329}
330#endif
331
332#if defined CONFIG_OF && defined CONFIG_REGULATOR
333
334#define SUPPLY_SUFFIX "-supply"
335
336/*
337 * Regulator handling code.
338 *
339 * Here we handle the num-supplies and vin*-supply properties of our
340 * "simple-framebuffer" dt node. This is necessary so that we can make sure
341 * that any regulators needed by the display hardware that the bootloader
342 * set up for us (and for which it provided a simplefb dt node), stay up,
343 * for the life of the simplefb driver.
344 *
345 * When the driver unloads, we cleanly disable, and then release the
346 * regulators.
347 *
348 * We only complain about errors here, no action is taken as the most likely
349 * error can only happen due to a mismatch between the bootloader which set
350 * up simplefb, and the regulator definitions in the device tree. Chances are
351 * that there are no adverse effects, and if there are, a clean teardown of
352 * the fb probe will not help us much either. So just complain and carry on,
353 * and hope that the user actually gets a working fb at the end of things.
354 */
355
356static void simpledrm_device_release_regulators(void *res)
357{
358 struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
359 unsigned int i;
360
361 for (i = 0; i < sdev->regulator_count; ++i) {
362 if (sdev->regulators[i]) {
363 regulator_disable(sdev->regulators[i]);
364 regulator_put(sdev->regulators[i]);
365 }
366 }
367}
368
369static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
370{
371 struct drm_device *dev = &sdev->dev;
372 struct platform_device *pdev = sdev->pdev;
373 struct device_node *of_node = pdev->dev.of_node;
374 struct property *prop;
375 struct regulator *regulator;
376 const char *p;
377 unsigned int count = 0, i = 0;
378 int ret;
379
380 if (dev_get_platdata(&pdev->dev) || !of_node)
381 return 0;
382
383 /* Count the number of regulator supplies */
384 for_each_property_of_node(of_node, prop) {
385 p = strstr(prop->name, SUPPLY_SUFFIX);
386 if (p && p != prop->name)
387 ++count;
388 }
389
390 if (!count)
391 return 0;
392
393 sdev->regulators = drmm_kzalloc(dev,
394 count * sizeof(sdev->regulators[0]),
395 GFP_KERNEL);
396 if (!sdev->regulators)
397 return -ENOMEM;
398
399 for_each_property_of_node(of_node, prop) {
400 char name[32]; /* 32 is max size of property name */
401 size_t len;
402
403 p = strstr(prop->name, SUPPLY_SUFFIX);
404 if (!p || p == prop->name)
405 continue;
406 len = strlen(prop->name) - strlen(SUPPLY_SUFFIX) + 1;
407 strscpy(name, prop->name, min(sizeof(name), len));
408
409 regulator = regulator_get_optional(&pdev->dev, name);
410 if (IS_ERR(regulator)) {
411 ret = PTR_ERR(regulator);
412 if (ret == -EPROBE_DEFER)
413 goto err;
414 drm_err(dev, "regulator %s not found: %d\n",
415 name, ret);
416 continue;
417 }
418
419 ret = regulator_enable(regulator);
420 if (ret) {
421 drm_err(dev, "failed to enable regulator %u: %d\n",
422 i, ret);
423 regulator_put(regulator);
424 continue;
425 }
426
427 sdev->regulators[i++] = regulator;
428 }
429 sdev->regulator_count = i;
430
431 return devm_add_action_or_reset(&pdev->dev,
432 simpledrm_device_release_regulators,
433 sdev);
434
435err:
436 while (i) {
437 --i;
438 if (sdev->regulators[i]) {
439 regulator_disable(sdev->regulators[i]);
440 regulator_put(sdev->regulators[i]);
441 }
442 }
443 return ret;
444}
445#else
446static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
447{
448 return 0;
449}
450#endif
451
452/*
453 * Simplefb settings
454 */
455
456static struct drm_display_mode simpledrm_mode(unsigned int width,
457 unsigned int height)
458{
459 struct drm_display_mode mode = { SIMPLEDRM_MODE(width, height) };
460
461 mode.clock = 60 /* Hz */ * mode.hdisplay * mode.vdisplay;
462 drm_mode_set_name(&mode);
463
464 return mode;
465}
466
467static int simpledrm_device_init_fb(struct simpledrm_device *sdev)
468{
469 int width, height, stride;
470 const struct drm_format_info *format;
471 struct drm_device *dev = &sdev->dev;
472 struct platform_device *pdev = sdev->pdev;
473 const struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev);
474 struct device_node *of_node = pdev->dev.of_node;
475
476 if (pd) {
477 width = simplefb_get_width_pd(dev, pd);
478 if (width < 0)
479 return width;
480 height = simplefb_get_height_pd(dev, pd);
481 if (height < 0)
482 return height;
483 stride = simplefb_get_stride_pd(dev, pd);
484 if (stride < 0)
485 return stride;
486 format = simplefb_get_format_pd(dev, pd);
487 if (IS_ERR(format))
488 return PTR_ERR(format);
489 } else if (of_node) {
490 width = simplefb_get_width_of(dev, of_node);
491 if (width < 0)
492 return width;
493 height = simplefb_get_height_of(dev, of_node);
494 if (height < 0)
495 return height;
496 stride = simplefb_get_stride_of(dev, of_node);
497 if (stride < 0)
498 return stride;
499 format = simplefb_get_format_of(dev, of_node);
500 if (IS_ERR(format))
501 return PTR_ERR(format);
502 } else {
503 drm_err(dev, "no simplefb configuration found\n");
504 return -ENODEV;
505 }
506
507 sdev->mode = simpledrm_mode(width, height);
508 sdev->format = format;
509 sdev->pitch = stride;
510
511 drm_dbg_kms(dev, "display mode={" DRM_MODE_FMT "}\n",
512 DRM_MODE_ARG(&sdev->mode));
513 drm_dbg_kms(dev,
514 "framebuffer format=%p4cc, size=%dx%d, stride=%d byte\n",
515 &format->format, width, height, stride);
516
517 return 0;
518}
519
520/*
521 * Memory management
522 */
523
524static int simpledrm_device_init_mm(struct simpledrm_device *sdev)
525{
526 struct drm_device *dev = &sdev->dev;
527 struct platform_device *pdev = sdev->pdev;
528 struct resource *mem;
529 void __iomem *screen_base;
530 int ret;
531
532 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
533 if (!mem)
534 return -EINVAL;
535
536 ret = devm_aperture_acquire_from_firmware(dev, mem->start, resource_size(mem));
537 if (ret) {
538 drm_err(dev, "could not acquire memory range %pr: error %d\n",
539 mem, ret);
540 return ret;
541 }
542
543 screen_base = devm_ioremap_wc(&pdev->dev, mem->start,
544 resource_size(mem));
545 if (!screen_base)
546 return -ENOMEM;
547
548 sdev->mem = mem;
549 sdev->screen_base = screen_base;
550
551 return 0;
552}
553
554/*
555 * Modesetting
556 */
557
558/*
559 * Support all formats of simplefb and maybe more; in order
560 * of preference. The display's update function will do any
561 * conversion necessary.
562 *
563 * TODO: Add blit helpers for remaining formats and uncomment
564 * constants.
565 */
566static const uint32_t simpledrm_default_formats[] = {
567 DRM_FORMAT_XRGB8888,
568 DRM_FORMAT_ARGB8888,
569 DRM_FORMAT_RGB565,
570 //DRM_FORMAT_XRGB1555,
571 //DRM_FORMAT_ARGB1555,
572 DRM_FORMAT_RGB888,
573 //DRM_FORMAT_XRGB2101010,
574 //DRM_FORMAT_ARGB2101010,
575};
576
577static const uint64_t simpledrm_format_modifiers[] = {
578 DRM_FORMAT_MOD_LINEAR,
579 DRM_FORMAT_MOD_INVALID
580};
581
582static int simpledrm_connector_helper_get_modes(struct drm_connector *connector)
583{
584 struct simpledrm_device *sdev = simpledrm_device_of_dev(connector->dev);
585 struct drm_display_mode *mode;
586
587 mode = drm_mode_duplicate(connector->dev, &sdev->mode);
588 if (!mode)
589 return 0;
590
591 if (mode->name[0] == '\0')
592 drm_mode_set_name(mode);
593
594 mode->type |= DRM_MODE_TYPE_PREFERRED;
595 drm_mode_probed_add(connector, mode);
596
597 if (mode->width_mm)
598 connector->display_info.width_mm = mode->width_mm;
599 if (mode->height_mm)
600 connector->display_info.height_mm = mode->height_mm;
601
602 return 1;
603}
604
605static const struct drm_connector_helper_funcs simpledrm_connector_helper_funcs = {
606 .get_modes = simpledrm_connector_helper_get_modes,
607};
608
609static const struct drm_connector_funcs simpledrm_connector_funcs = {
610 .reset = drm_atomic_helper_connector_reset,
611 .fill_modes = drm_helper_probe_single_connector_modes,
612 .destroy = drm_connector_cleanup,
613 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
614 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
615};
616
617static int
618simpledrm_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
619 const struct drm_display_mode *mode)
620{
621 struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
622
623 if (mode->hdisplay != sdev->mode.hdisplay &&
624 mode->vdisplay != sdev->mode.vdisplay)
625 return MODE_ONE_SIZE;
626 else if (mode->hdisplay != sdev->mode.hdisplay)
627 return MODE_ONE_WIDTH;
628 else if (mode->vdisplay != sdev->mode.vdisplay)
629 return MODE_ONE_HEIGHT;
630
631 return MODE_OK;
632}
633
634static void
635simpledrm_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
636 struct drm_crtc_state *crtc_state,
637 struct drm_plane_state *plane_state)
638{
639 struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
640 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
641 struct drm_framebuffer *fb = plane_state->fb;
642 void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */
643 struct drm_device *dev = &sdev->dev;
644 int idx;
645
646 if (!fb)
647 return;
648
649 if (!drm_dev_enter(dev, &idx))
650 return;
651
652 drm_fb_blit_dstclip(sdev->screen_base, sdev->pitch,
653 sdev->format->format, vmap, fb);
654 drm_dev_exit(idx);
655}
656
657static void
658simpledrm_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
659{
660 struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
661 struct drm_device *dev = &sdev->dev;
662 int idx;
663
664 if (!drm_dev_enter(dev, &idx))
665 return;
666
667 /* Clear screen to black if disabled */
668 memset_io(sdev->screen_base, 0, sdev->pitch * sdev->mode.vdisplay);
669
670 drm_dev_exit(idx);
671}
672
673static void
674simpledrm_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
675 struct drm_plane_state *old_plane_state)
676{
677 struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
678 struct drm_plane_state *plane_state = pipe->plane.state;
679 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
680 void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */
681 struct drm_framebuffer *fb = plane_state->fb;
682 struct drm_device *dev = &sdev->dev;
683 struct drm_rect clip;
684 int idx;
685
686 if (!fb)
687 return;
688
689 if (!drm_atomic_helper_damage_merged(old_plane_state, plane_state, &clip))
690 return;
691
692 if (!drm_dev_enter(dev, &idx))
693 return;
694
695 drm_fb_blit_rect_dstclip(sdev->screen_base, sdev->pitch,
696 sdev->format->format, vmap, fb, &clip);
697
698 drm_dev_exit(idx);
699}
700
701static const struct drm_simple_display_pipe_funcs
702simpledrm_simple_display_pipe_funcs = {
703 .mode_valid = simpledrm_simple_display_pipe_mode_valid,
704 .enable = simpledrm_simple_display_pipe_enable,
705 .disable = simpledrm_simple_display_pipe_disable,
706 .update = simpledrm_simple_display_pipe_update,
707 DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
708};
709
710static const struct drm_mode_config_funcs simpledrm_mode_config_funcs = {
711 .fb_create = drm_gem_fb_create_with_dirty,
712 .atomic_check = drm_atomic_helper_check,
713 .atomic_commit = drm_atomic_helper_commit,
714};
715
716static const uint32_t *simpledrm_device_formats(struct simpledrm_device *sdev,
717 size_t *nformats_out)
718{
719 struct drm_device *dev = &sdev->dev;
720 size_t i;
721
722 if (sdev->nformats)
723 goto out; /* don't rebuild list on recurring calls */
724
725 /* native format goes first */
726 sdev->formats[0] = sdev->format->format;
727 sdev->nformats = 1;
728
729 /* default formats go second */
730 for (i = 0; i < ARRAY_SIZE(simpledrm_default_formats); ++i) {
731 if (simpledrm_default_formats[i] == sdev->format->format)
732 continue; /* native format already went first */
733 sdev->formats[sdev->nformats] = simpledrm_default_formats[i];
734 sdev->nformats++;
735 }
736
737 /*
738 * TODO: The simpledrm driver converts framebuffers to the native
739 * format when copying them to device memory. If there are more
740 * formats listed than supported by the driver, the native format
741 * is not supported by the conversion helpers. Therefore *only*
742 * support the native format and add a conversion helper ASAP.
743 */
744 if (drm_WARN_ONCE(dev, i != sdev->nformats,
745 "format conversion helpers required for %p4cc",
746 &sdev->format->format)) {
747 sdev->nformats = 1;
748 }
749
750out:
751 *nformats_out = sdev->nformats;
752 return sdev->formats;
753}
754
755static int simpledrm_device_init_modeset(struct simpledrm_device *sdev)
756{
757 struct drm_device *dev = &sdev->dev;
758 struct drm_display_mode *mode = &sdev->mode;
759 struct drm_connector *connector = &sdev->connector;
760 struct drm_simple_display_pipe *pipe = &sdev->pipe;
761 const uint32_t *formats;
762 size_t nformats;
763 int ret;
764
765 ret = drmm_mode_config_init(dev);
766 if (ret)
767 return ret;
768
769 dev->mode_config.min_width = mode->hdisplay;
770 dev->mode_config.max_width = mode->hdisplay;
771 dev->mode_config.min_height = mode->vdisplay;
772 dev->mode_config.max_height = mode->vdisplay;
773 dev->mode_config.prefer_shadow_fbdev = true;
774 dev->mode_config.preferred_depth = sdev->format->cpp[0] * 8;
775 dev->mode_config.funcs = &simpledrm_mode_config_funcs;
776
777 ret = drm_connector_init(dev, connector, &simpledrm_connector_funcs,
778 DRM_MODE_CONNECTOR_Unknown);
779 if (ret)
780 return ret;
781 drm_connector_helper_add(connector, &simpledrm_connector_helper_funcs);
782
783 formats = simpledrm_device_formats(sdev, &nformats);
784
785 ret = drm_simple_display_pipe_init(dev, pipe, &simpledrm_simple_display_pipe_funcs,
786 formats, nformats, simpledrm_format_modifiers,
787 connector);
788 if (ret)
789 return ret;
790
791 drm_mode_config_reset(dev);
792
793 return 0;
794}
795
796/*
797 * Init / Cleanup
798 */
799
800static struct simpledrm_device *
801simpledrm_device_create(struct drm_driver *drv, struct platform_device *pdev)
802{
803 struct simpledrm_device *sdev;
804 int ret;
805
806 sdev = devm_drm_dev_alloc(&pdev->dev, drv, struct simpledrm_device,
807 dev);
808 if (IS_ERR(sdev))
809 return ERR_CAST(sdev);
810 sdev->pdev = pdev;
811 platform_set_drvdata(pdev, sdev);
812
813 ret = simpledrm_device_init_clocks(sdev);
814 if (ret)
815 return ERR_PTR(ret);
816 ret = simpledrm_device_init_regulators(sdev);
817 if (ret)
818 return ERR_PTR(ret);
819 ret = simpledrm_device_init_fb(sdev);
820 if (ret)
821 return ERR_PTR(ret);
822 ret = simpledrm_device_init_mm(sdev);
823 if (ret)
824 return ERR_PTR(ret);
825 ret = simpledrm_device_init_modeset(sdev);
826 if (ret)
827 return ERR_PTR(ret);
828
829 return sdev;
830}
831
832/*
833 * DRM driver
834 */
835
836DEFINE_DRM_GEM_FOPS(simpledrm_fops);
837
838static struct drm_driver simpledrm_driver = {
839 DRM_GEM_SHMEM_DRIVER_OPS,
840 .name = DRIVER_NAME,
841 .desc = DRIVER_DESC,
842 .date = DRIVER_DATE,
843 .major = DRIVER_MAJOR,
844 .minor = DRIVER_MINOR,
845 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
846 .fops = &simpledrm_fops,
847};
848
849/*
850 * Platform driver
851 */
852
853static int simpledrm_probe(struct platform_device *pdev)
854{
855 struct simpledrm_device *sdev;
856 struct drm_device *dev;
857 int ret;
858
859 sdev = simpledrm_device_create(&simpledrm_driver, pdev);
860 if (IS_ERR(sdev))
861 return PTR_ERR(sdev);
862 dev = &sdev->dev;
863
864 ret = drm_dev_register(dev, 0);
865 if (ret)
866 return ret;
867
868 drm_fbdev_generic_setup(dev, 0);
869
870 return 0;
871}
872
873static int simpledrm_remove(struct platform_device *pdev)
874{
875 struct simpledrm_device *sdev = platform_get_drvdata(pdev);
876 struct drm_device *dev = &sdev->dev;
877
878 drm_dev_unplug(dev);
879
880 return 0;
881}
882
883static const struct of_device_id simpledrm_of_match_table[] = {
884 { .compatible = "simple-framebuffer", },
885 { },
886};
887MODULE_DEVICE_TABLE(of, simpledrm_of_match_table);
888
889static struct platform_driver simpledrm_platform_driver = {
890 .driver = {
891 .name = "simple-framebuffer", /* connect to sysfb */
892 .of_match_table = simpledrm_of_match_table,
893 },
894 .probe = simpledrm_probe,
895 .remove = simpledrm_remove,
896};
897
898module_platform_driver(simpledrm_platform_driver);
899
900MODULE_DESCRIPTION(DRIVER_DESC);
901MODULE_LICENSE("GPL v2");