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