adp_drv.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2
  3#include <linux/component.h>
  4#include <linux/iopoll.h>
  5#include <linux/of.h>
  6#include <linux/platform_device.h>
  7
  8#include <drm/drm_atomic.h>
  9#include <drm/drm_atomic_helper.h>
 10#include <drm/drm_bridge.h>
 11#include <drm/drm_bridge_connector.h>
 12#include <drm/drm_drv.h>
 13#include <drm/drm_fb_dma_helper.h>
 14#include <drm/drm_framebuffer.h>
 15#include <drm/drm_gem_atomic_helper.h>
 16#include <drm/drm_gem_dma_helper.h>
 17#include <drm/drm_gem_framebuffer_helper.h>
 18#include <drm/drm_of.h>
 19#include <drm/drm_print.h>
 20#include <drm/drm_probe_helper.h>
 21#include <drm/drm_vblank.h>
 22
 23#define ADP_INT_STATUS 0x34
 24#define ADP_INT_STATUS_INT_MASK 0x7
 25#define ADP_INT_STATUS_VBLANK 0x1
 26#define ADP_CTRL 0x100
 27#define ADP_CTRL_VBLANK_ON 0x12
 28#define ADP_CTRL_FIFO_ON 0x601
 29#define ADP_SCREEN_SIZE 0x0c
 30#define ADP_SCREEN_HSIZE GENMASK(15, 0)
 31#define ADP_SCREEN_VSIZE GENMASK(31, 16)
 32
 33#define ADBE_FIFO 0x10c0
 34#define ADBE_FIFO_SYNC 0xc0000000
 35
 36#define ADBE_BLEND_BYPASS 0x2020
 37#define ADBE_BLEND_EN1 0x2028
 38#define ADBE_BLEND_EN2 0x2074
 39#define ADBE_BLEND_EN3 0x202c
 40#define ADBE_BLEND_EN4 0x2034
 41#define ADBE_MASK_BUF 0x2200
 42
 43#define ADBE_SRC_START 0x4040
 44#define ADBE_SRC_SIZE 0x4048
 45#define ADBE_DST_START 0x4050
 46#define ADBE_DST_SIZE 0x4054
 47#define ADBE_STRIDE 0x4038
 48#define ADBE_FB_BASE 0x4030
 49
 50#define ADBE_LAYER_EN1 0x4020
 51#define ADBE_LAYER_EN2 0x4068
 52#define ADBE_LAYER_EN3 0x40b4
 53#define ADBE_LAYER_EN4 0x40f4
 54#define ADBE_SCALE_CTL 0x40ac
 55#define ADBE_SCALE_CTL_BYPASS 0x100000
 56
 57#define ADBE_LAYER_CTL 0x1038
 58#define ADBE_LAYER_CTL_ENABLE 0x10000
 59
 60#define ADBE_PIX_FMT 0x402c
 61#define ADBE_PIX_FMT_XRGB32 0x53e4001
 62
 63static int adp_open(struct inode *inode, struct file *filp)
 64{
 65	/*
 66	 * The modesetting driver does not check the non-desktop connector
 67	 * property and keeps the device open and locked. If the touchbar daemon
 68	 * opens the device first, modesetting breaks the whole X session.
 69	 * Simply refuse to open the device for X11 server processes as
 70	 * workaround.
 71	 */
 72	if (current->comm[0] == 'X')
 73		return -EBUSY;
 74
 75	return drm_open(inode, filp);
 76}
 77
 78static const struct file_operations adp_fops = {
 79	.owner          = THIS_MODULE,
 80	.open           = adp_open,
 81	.release        = drm_release,
 82	.unlocked_ioctl = drm_ioctl,
 83	.compat_ioctl   = drm_compat_ioctl,
 84	.poll           = drm_poll,
 85	.read           = drm_read,
 86	.llseek         = noop_llseek,
 87	.mmap           = drm_gem_mmap,
 88	.fop_flags      = FOP_UNSIGNED_OFFSET,
 89	DRM_GEM_DMA_UNMAPPED_AREA_FOPS
 90};
 91
 92static int adp_drm_gem_dumb_create(struct drm_file *file_priv,
 93					struct drm_device *drm,
 94					struct drm_mode_create_dumb *args)
 95{
 96	args->height = ALIGN(args->height, 64);
 97	args->size = args->pitch * args->height;
 98
 99	return drm_gem_dma_dumb_create_internal(file_priv, drm, args);
100}
101
102static const struct drm_driver adp_driver = {
103	.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
104	.fops = &adp_fops,
105	DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(adp_drm_gem_dumb_create),
106	.name = "adp",
107	.desc = "Apple Display Pipe DRM Driver",
108	.major = 0,
109	.minor = 1,
110};
111
112struct adp_drv_private {
113	struct drm_device drm;
114	struct drm_crtc crtc;
115	struct drm_encoder *encoder;
116	struct drm_connector *connector;
117	struct drm_bridge *next_bridge;
118	void __iomem *be;
119	void __iomem *fe;
120	u32 *mask_buf;
121	u64 mask_buf_size;
122	dma_addr_t mask_iova;
123	int be_irq;
124	int fe_irq;
125	struct drm_pending_vblank_event *event;
126};
127
128#define to_adp(x) container_of(x, struct adp_drv_private, drm)
129#define crtc_to_adp(x) container_of(x, struct adp_drv_private, crtc)
130
131static int adp_plane_atomic_check(struct drm_plane *plane,
132				    struct drm_atomic_state *state)
133{
134	struct drm_plane_state *new_plane_state;
135	struct drm_crtc_state *crtc_state;
136
137	new_plane_state = drm_atomic_get_new_plane_state(state, plane);
138
139	if (!new_plane_state->crtc)
140		return 0;
141
142	crtc_state = drm_atomic_get_crtc_state(state, new_plane_state->crtc);
143	if (IS_ERR(crtc_state))
144		return PTR_ERR(crtc_state);
145
146	return drm_atomic_helper_check_plane_state(new_plane_state,
147						   crtc_state,
148						   DRM_PLANE_NO_SCALING,
149						   DRM_PLANE_NO_SCALING,
150						   true, true);
151}
152
153static void adp_plane_atomic_update(struct drm_plane *plane,
154				    struct drm_atomic_state *state)
155{
156	struct adp_drv_private *adp;
157	struct drm_rect src_rect;
158	struct drm_gem_dma_object *obj;
159	struct drm_framebuffer *fb;
160	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state, plane);
161	u32 src_pos, src_size, dst_pos, dst_size;
162
163	if (!plane || !new_state)
164		return;
165
166	fb = new_state->fb;
167	if (!fb)
168		return;
169	adp = to_adp(plane->dev);
170
171	drm_rect_fp_to_int(&src_rect, &new_state->src);
172	src_pos = src_rect.x1 << 16 | src_rect.y1;
173	dst_pos = new_state->dst.x1 << 16 | new_state->dst.y1;
174	src_size = drm_rect_width(&src_rect) << 16 | drm_rect_height(&src_rect);
175	dst_size = drm_rect_width(&new_state->dst) << 16 |
176		drm_rect_height(&new_state->dst);
177	writel(src_pos, adp->be + ADBE_SRC_START);
178	writel(src_size, adp->be + ADBE_SRC_SIZE);
179	writel(dst_pos, adp->be + ADBE_DST_START);
180	writel(dst_size, adp->be + ADBE_DST_SIZE);
181	writel(fb->pitches[0], adp->be + ADBE_STRIDE);
182	obj = drm_fb_dma_get_gem_obj(fb, 0);
183	if (obj)
184		writel(obj->dma_addr + fb->offsets[0], adp->be + ADBE_FB_BASE);
185
186	writel(BIT(0), adp->be + ADBE_LAYER_EN1);
187	writel(BIT(0), adp->be + ADBE_LAYER_EN2);
188	writel(BIT(0), adp->be + ADBE_LAYER_EN3);
189	writel(BIT(0), adp->be + ADBE_LAYER_EN4);
190	writel(ADBE_SCALE_CTL_BYPASS, adp->be + ADBE_SCALE_CTL);
191	writel(ADBE_LAYER_CTL_ENABLE | BIT(0), adp->be + ADBE_LAYER_CTL);
192	writel(ADBE_PIX_FMT_XRGB32, adp->be + ADBE_PIX_FMT);
193}
194
195static void adp_plane_atomic_disable(struct drm_plane *plane,
196				     struct drm_atomic_state *state)
197{
198	struct adp_drv_private *adp = to_adp(plane->dev);
199
200	writel(0x0, adp->be + ADBE_LAYER_EN1);
201	writel(0x0, adp->be + ADBE_LAYER_EN2);
202	writel(0x0, adp->be + ADBE_LAYER_EN3);
203	writel(0x0, adp->be + ADBE_LAYER_EN4);
204	writel(ADBE_LAYER_CTL_ENABLE, adp->be + ADBE_LAYER_CTL);
205}
206
207static const struct drm_plane_helper_funcs adp_plane_helper_funcs = {
208	.atomic_check = adp_plane_atomic_check,
209	.atomic_update = adp_plane_atomic_update,
210	.atomic_disable = adp_plane_atomic_disable,
211	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS
212};
213
214static const struct drm_plane_funcs adp_plane_funcs = {
215	.update_plane = drm_atomic_helper_update_plane,
216	.disable_plane = drm_atomic_helper_disable_plane,
217	DRM_GEM_SHADOW_PLANE_FUNCS
218};
219
220static const u32 plane_formats[] = {
221	DRM_FORMAT_XRGB8888,
222};
223
224#define ALL_CRTCS 1
225
226static struct drm_plane *adp_plane_new(struct adp_drv_private *adp)
227{
228	struct drm_device *drm = &adp->drm;
229	struct drm_plane *plane;
230
231	plane = __drmm_universal_plane_alloc(drm, sizeof(struct drm_plane), 0,
232					     ALL_CRTCS, &adp_plane_funcs,
233					     plane_formats, ARRAY_SIZE(plane_formats),
234					     NULL, DRM_PLANE_TYPE_PRIMARY, "plane");
235	if (IS_ERR(plane)) {
236		drm_err(drm, "failed to allocate plane");
237		return plane;
238	}
239
240	drm_plane_helper_add(plane, &adp_plane_helper_funcs);
241	return plane;
242}
243
244static void adp_enable_vblank(struct adp_drv_private *adp)
245{
246	u32 cur_ctrl;
247
248	writel(ADP_INT_STATUS_INT_MASK, adp->fe + ADP_INT_STATUS);
249
250	cur_ctrl = readl(adp->fe + ADP_CTRL);
251	writel(cur_ctrl | ADP_CTRL_VBLANK_ON, adp->fe + ADP_CTRL);
252}
253
254static int adp_crtc_enable_vblank(struct drm_crtc *crtc)
255{
256	struct drm_device *dev = crtc->dev;
257	struct adp_drv_private *adp = to_adp(dev);
258
259	adp_enable_vblank(adp);
260
261	return 0;
262}
263
264static void adp_disable_vblank(struct adp_drv_private *adp)
265{
266	u32 cur_ctrl;
267
268	cur_ctrl = readl(adp->fe + ADP_CTRL);
269	writel(cur_ctrl & ~ADP_CTRL_VBLANK_ON, adp->fe + ADP_CTRL);
270	writel(ADP_INT_STATUS_INT_MASK, adp->fe + ADP_INT_STATUS);
271}
272
273static void adp_crtc_disable_vblank(struct drm_crtc *crtc)
274{
275	struct drm_device *dev = crtc->dev;
276	struct adp_drv_private *adp = to_adp(dev);
277
278	adp_disable_vblank(adp);
279}
280
281static void adp_crtc_atomic_enable(struct drm_crtc *crtc,
282				   struct drm_atomic_state *state)
283{
284	struct adp_drv_private *adp = crtc_to_adp(crtc);
285
286	writel(BIT(0), adp->be + ADBE_BLEND_EN2);
287	writel(BIT(4), adp->be + ADBE_BLEND_EN1);
288	writel(BIT(0), adp->be + ADBE_BLEND_EN3);
289	writel(BIT(0), adp->be + ADBE_BLEND_BYPASS);
290	writel(BIT(0), adp->be + ADBE_BLEND_EN4);
291	drm_crtc_vblank_on(crtc);
292}
293
294static void adp_crtc_atomic_disable(struct drm_crtc *crtc,
295				    struct drm_atomic_state *state)
296{
297	struct adp_drv_private *adp = crtc_to_adp(crtc);
298	struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state, crtc);
299
300	drm_atomic_helper_disable_planes_on_crtc(old_state, false);
301
302	writel(0x0, adp->be + ADBE_BLEND_EN2);
303	writel(0x0, adp->be + ADBE_BLEND_EN1);
304	writel(0x0, adp->be + ADBE_BLEND_EN3);
305	writel(0x0, adp->be + ADBE_BLEND_BYPASS);
306	writel(0x0, adp->be + ADBE_BLEND_EN4);
307	drm_crtc_vblank_off(crtc);
308}
309
310static void adp_crtc_atomic_flush(struct drm_crtc *crtc,
311				  struct drm_atomic_state *state)
312{
313	u32 frame_num = 1;
314	unsigned long flags;
315	struct adp_drv_private *adp = crtc_to_adp(crtc);
316	struct drm_crtc_state *new_state = drm_atomic_get_new_crtc_state(state, crtc);
317	u64 new_size = ALIGN(new_state->mode.hdisplay *
318			     new_state->mode.vdisplay * 4, PAGE_SIZE);
319
320	if (new_size != adp->mask_buf_size) {
321		if (adp->mask_buf)
322			dma_free_coherent(crtc->dev->dev, adp->mask_buf_size,
323					  adp->mask_buf, adp->mask_iova);
324		adp->mask_buf = NULL;
325		if (new_size != 0) {
326			adp->mask_buf = dma_alloc_coherent(crtc->dev->dev, new_size,
327							   &adp->mask_iova, GFP_KERNEL);
328			memset(adp->mask_buf, 0xFF, new_size);
329			writel(adp->mask_iova, adp->be + ADBE_MASK_BUF);
330		}
331		adp->mask_buf_size = new_size;
332	}
333	writel(ADBE_FIFO_SYNC | frame_num, adp->be + ADBE_FIFO);
334	//FIXME: use adbe flush interrupt
335	if (crtc->state->event) {
336		struct drm_pending_vblank_event *event = crtc->state->event;
337
338		crtc->state->event = NULL;
339		spin_lock_irqsave(&crtc->dev->event_lock, flags);
340
341		if (drm_crtc_vblank_get(crtc) != 0)
342			drm_crtc_send_vblank_event(crtc, event);
343		else
344			adp->event = event;
345
346		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
347	}
348}
349
350static const struct drm_crtc_funcs adp_crtc_funcs = {
351	.destroy = drm_crtc_cleanup,
352	.set_config = drm_atomic_helper_set_config,
353	.page_flip = drm_atomic_helper_page_flip,
354	.reset = drm_atomic_helper_crtc_reset,
355	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
356	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
357	.enable_vblank = adp_crtc_enable_vblank,
358	.disable_vblank = adp_crtc_disable_vblank,
359};
360
361
362static const struct drm_crtc_helper_funcs adp_crtc_helper_funcs = {
363	.atomic_enable = adp_crtc_atomic_enable,
364	.atomic_disable = adp_crtc_atomic_disable,
365	.atomic_flush = adp_crtc_atomic_flush,
366};
367
368static int adp_setup_crtc(struct adp_drv_private *adp)
369{
370	struct drm_device *drm = &adp->drm;
371	struct drm_plane *primary;
372	int ret;
373
374	primary = adp_plane_new(adp);
375	if (IS_ERR(primary))
376		return PTR_ERR(primary);
377
378	ret = drm_crtc_init_with_planes(drm, &adp->crtc, primary,
379					NULL, &adp_crtc_funcs, NULL);
380	if (ret)
381		return ret;
382
383	drm_crtc_helper_add(&adp->crtc, &adp_crtc_helper_funcs);
384	return 0;
385}
386
387static const struct drm_mode_config_funcs adp_mode_config_funcs = {
388	.fb_create = drm_gem_fb_create_with_dirty,
389	.atomic_check = drm_atomic_helper_check,
390	.atomic_commit = drm_atomic_helper_commit,
391};
392
393static int adp_setup_mode_config(struct adp_drv_private *adp)
394{
395	struct drm_device *drm = &adp->drm;
396	int ret;
397	u32 size;
398
399	ret = drmm_mode_config_init(drm);
400	if (ret)
401		return ret;
402
403	/*
404	 * Query screen size restrict the frame buffer size to the screen size
405	 * aligned to the next multiple of 64. This is not necessary but can be
406	 * used as simple check for non-desktop devices.
407	 * Xorg's modesetting driver does not care about the connector
408	 * "non-desktop" property. The max frame buffer width or height can be
409	 * easily checked and a device can be reject if the max width/height is
410	 * smaller than 120 for example.
411	 * Any touchbar daemon is not limited by this small framebuffer size.
412	 */
413	size = readl(adp->fe + ADP_SCREEN_SIZE);
414
415	drm->mode_config.min_width = 32;
416	drm->mode_config.min_height = 32;
417	drm->mode_config.max_width = ALIGN(FIELD_GET(ADP_SCREEN_HSIZE, size), 64);
418	drm->mode_config.max_height = ALIGN(FIELD_GET(ADP_SCREEN_VSIZE, size), 64);
419	drm->mode_config.preferred_depth = 24;
420	drm->mode_config.prefer_shadow = 0;
421	drm->mode_config.funcs = &adp_mode_config_funcs;
422
423	ret = adp_setup_crtc(adp);
424	if (ret) {
425		drm_err(drm, "failed to create crtc");
426		return ret;
427	}
428
429	adp->encoder = drmm_plain_encoder_alloc(drm, NULL, DRM_MODE_ENCODER_DSI, NULL);
430	if (IS_ERR(adp->encoder)) {
431		drm_err(drm, "failed to init encoder");
432		return PTR_ERR(adp->encoder);
433	}
434	adp->encoder->possible_crtcs = ALL_CRTCS;
435
436	ret = drm_bridge_attach(adp->encoder, adp->next_bridge, NULL,
437				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
438	if (ret) {
439		drm_err(drm, "failed to init bridge chain");
440		return ret;
441	}
442
443	adp->connector = drm_bridge_connector_init(drm, adp->encoder);
444	if (IS_ERR(adp->connector))
445		return PTR_ERR(adp->connector);
446
447	drm_connector_attach_encoder(adp->connector, adp->encoder);
448
449	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
450	if (ret < 0) {
451		drm_err(drm, "failed to initialize vblank");
452		return ret;
453	}
454
455	drm_mode_config_reset(drm);
456
457	return 0;
458}
459
460static int adp_parse_of(struct platform_device *pdev, struct adp_drv_private *adp)
461{
462	struct device *dev = &pdev->dev;
463
464	adp->be = devm_platform_ioremap_resource_byname(pdev, "be");
465	if (IS_ERR(adp->be)) {
466		dev_err(dev, "failed to map display backend mmio");
467		return PTR_ERR(adp->be);
468	}
469
470	adp->fe = devm_platform_ioremap_resource_byname(pdev, "fe");
471	if (IS_ERR(adp->fe)) {
472		dev_err(dev, "failed to map display pipe mmio");
473		return PTR_ERR(adp->fe);
474	}
475
476	adp->be_irq = platform_get_irq_byname(pdev, "be");
477	if (adp->be_irq < 0)
478		return adp->be_irq;
479
480	adp->fe_irq = platform_get_irq_byname(pdev, "fe");
481	if (adp->fe_irq < 0)
482		return adp->fe_irq;
483
484	return 0;
485}
486
487static irqreturn_t adp_fe_irq(int irq, void *arg)
488{
489	struct adp_drv_private *adp = (struct adp_drv_private *)arg;
490	u32 int_status;
491	u32 int_ctl;
492
493	int_status = readl(adp->fe + ADP_INT_STATUS);
494	if (int_status & ADP_INT_STATUS_VBLANK) {
495		drm_crtc_handle_vblank(&adp->crtc);
496		spin_lock(&adp->crtc.dev->event_lock);
497		if (adp->event) {
498			int_ctl = readl(adp->fe + ADP_CTRL);
499			if ((int_ctl & 0xF00) == 0x600) {
500				drm_crtc_send_vblank_event(&adp->crtc, adp->event);
501				adp->event = NULL;
502				drm_crtc_vblank_put(&adp->crtc);
503			}
504		}
505		spin_unlock(&adp->crtc.dev->event_lock);
506	}
507
508	writel(int_status, adp->fe + ADP_INT_STATUS);
509
510
511	return IRQ_HANDLED;
512}
513
514static int adp_drm_bind(struct device *dev)
515{
516	struct drm_device *drm = dev_get_drvdata(dev);
517	struct adp_drv_private *adp = to_adp(drm);
518	int err;
519
520	writel(ADP_CTRL_FIFO_ON, adp->fe + ADP_CTRL);
521
522	adp->next_bridge = drmm_of_get_bridge(&adp->drm, dev->of_node, 0, 0);
523	if (IS_ERR(adp->next_bridge)) {
524		dev_err(dev, "failed to find next bridge");
525		return PTR_ERR(adp->next_bridge);
526	}
527
528	err = adp_setup_mode_config(adp);
529	if (err < 0)
530		return err;
531
532	err = request_irq(adp->fe_irq, adp_fe_irq, 0, "adp-fe", adp);
533	if (err)
534		return err;
535
536	err = drm_dev_register(&adp->drm, 0);
537	if (err)
538		return err;
539
540	return 0;
541}
542
543static void adp_drm_unbind(struct device *dev)
544{
545	struct drm_device *drm = dev_get_drvdata(dev);
546	struct adp_drv_private *adp = to_adp(drm);
547
548	drm_dev_unregister(drm);
549	drm_atomic_helper_shutdown(drm);
550	free_irq(adp->fe_irq, adp);
551}
552
553static const struct component_master_ops adp_master_ops = {
554	.bind	= adp_drm_bind,
555	.unbind = adp_drm_unbind,
556};
557
558static int compare_dev(struct device *dev, void *data)
559{
560	return dev->of_node == data;
561}
562
563static int adp_probe(struct platform_device *pdev)
564{
565	struct device_node *port;
566	struct component_match *match = NULL;
567	struct adp_drv_private *adp;
568	int err;
569
570	adp = devm_drm_dev_alloc(&pdev->dev, &adp_driver, struct adp_drv_private, drm);
571	if (IS_ERR(adp))
572		return PTR_ERR(adp);
573
574	dev_set_drvdata(&pdev->dev, &adp->drm);
575
576	err = adp_parse_of(pdev, adp);
577	if (err < 0)
578		return err;
579
580	port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
581	if (!port)
582		return -ENODEV;
583
584	drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
585	of_node_put(port);
586
587	return component_master_add_with_match(&pdev->dev, &adp_master_ops, match);
588}
589
590static void adp_remove(struct platform_device *pdev)
591{
592	component_master_del(&pdev->dev, &adp_master_ops);
593	dev_set_drvdata(&pdev->dev, NULL);
594}
595
596static const struct of_device_id adp_of_match[] = {
597	{ .compatible = "apple,h7-display-pipe", },
598	{ },
599};
600MODULE_DEVICE_TABLE(of, adp_of_match);
601
602static struct platform_driver adp_platform_driver = {
603	.driver = {
604		.name = "adp",
605		.of_match_table = adp_of_match,
606	},
607	.probe = adp_probe,
608	.remove = adp_remove,
609};
610
611module_platform_driver(adp_platform_driver);
612
613MODULE_DESCRIPTION("Apple Display Pipe DRM driver");
614MODULE_LICENSE("GPL");