1 // SPDX-License-Identifier: GPL-2.0-only
2 /**************************************************************************
3  * Copyright (c) 2007-2011, Intel Corporation.
4  * All Rights Reserved.
5  *
6  **************************************************************************/
7 
8 #include <linux/console.h>
9 #include <linux/delay.h>
10 #include <linux/errno.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/module.h>
15 #include <linux/pfn_t.h>
16 #include <linux/slab.h>
17 #include <linux/string.h>
18 #include <linux/tty.h>
19 
20 #include <drm/drm.h>
21 #include <drm/drm_crtc.h>
22 #include <drm/drm_fb_helper.h>
23 #include <drm/drm_fourcc.h>
24 #include <drm/drm_gem_framebuffer_helper.h>
25 
26 #include "framebuffer.h"
27 #include "gem.h"
28 #include "gtt.h"
29 #include "psb_drv.h"
30 #include "psb_intel_drv.h"
31 #include "psb_intel_reg.h"
32 
33 static const struct drm_framebuffer_funcs psb_fb_funcs = {
34 	.destroy = drm_gem_fb_destroy,
35 	.create_handle = drm_gem_fb_create_handle,
36 };
37 
38 #define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
39 
40 static int psbfb_setcolreg(unsigned regno, unsigned red, unsigned green,
41 			   unsigned blue, unsigned transp,
42 			   struct fb_info *info)
43 {
44 	struct drm_fb_helper *fb_helper = info->par;
45 	struct drm_framebuffer *fb = fb_helper->fb;
46 	uint32_t v;
47 
48 	if (!fb)
49 		return -ENOMEM;
50 
51 	if (regno > 255)
52 		return 1;
53 
54 	red = CMAP_TOHW(red, info->var.red.length);
55 	blue = CMAP_TOHW(blue, info->var.blue.length);
56 	green = CMAP_TOHW(green, info->var.green.length);
57 	transp = CMAP_TOHW(transp, info->var.transp.length);
58 
59 	v = (red << info->var.red.offset) |
60 	    (green << info->var.green.offset) |
61 	    (blue << info->var.blue.offset) |
62 	    (transp << info->var.transp.offset);
63 
64 	if (regno < 16) {
65 		switch (fb->format->cpp[0] * 8) {
66 		case 16:
67 			((uint32_t *) info->pseudo_palette)[regno] = v;
68 			break;
69 		case 24:
70 		case 32:
71 			((uint32_t *) info->pseudo_palette)[regno] = v;
72 			break;
73 		}
74 	}
75 
76 	return 0;
77 }
78 
79 static vm_fault_t psbfb_vm_fault(struct vm_fault *vmf)
80 {
81 	struct vm_area_struct *vma = vmf->vma;
82 	struct drm_framebuffer *fb = vma->vm_private_data;
83 	struct drm_device *dev = fb->dev;
84 	struct drm_psb_private *dev_priv = dev->dev_private;
85 	struct gtt_range *gtt = to_gtt_range(fb->obj[0]);
86 	int page_num;
87 	int i;
88 	unsigned long address;
89 	vm_fault_t ret = VM_FAULT_SIGBUS;
90 	unsigned long pfn;
91 	unsigned long phys_addr = (unsigned long)dev_priv->stolen_base +
92 				  gtt->offset;
93 
94 	page_num = vma_pages(vma);
95 	address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
96 
97 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
98 
99 	for (i = 0; i < page_num; i++) {
100 		pfn = (phys_addr >> PAGE_SHIFT);
101 
102 		ret = vmf_insert_mixed(vma, address,
103 				__pfn_to_pfn_t(pfn, PFN_DEV));
104 		if (unlikely(ret & VM_FAULT_ERROR))
105 			break;
106 		address += PAGE_SIZE;
107 		phys_addr += PAGE_SIZE;
108 	}
109 	return ret;
110 }
111 
112 static void psbfb_vm_open(struct vm_area_struct *vma)
113 {
114 }
115 
116 static void psbfb_vm_close(struct vm_area_struct *vma)
117 {
118 }
119 
120 static const struct vm_operations_struct psbfb_vm_ops = {
121 	.fault	= psbfb_vm_fault,
122 	.open	= psbfb_vm_open,
123 	.close	= psbfb_vm_close
124 };
125 
126 static int psbfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
127 {
128 	struct drm_fb_helper *fb_helper = info->par;
129 	struct drm_framebuffer *fb = fb_helper->fb;
130 
131 	if (vma->vm_pgoff != 0)
132 		return -EINVAL;
133 	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
134 		return -EINVAL;
135 
136 	/*
137 	 * If this is a GEM object then info->screen_base is the virtual
138 	 * kernel remapping of the object. FIXME: Review if this is
139 	 * suitable for our mmap work
140 	 */
141 	vma->vm_ops = &psbfb_vm_ops;
142 	vma->vm_private_data = (void *)fb;
143 	vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
144 	return 0;
145 }
146 
147 static const struct fb_ops psbfb_unaccel_ops = {
148 	.owner = THIS_MODULE,
149 	DRM_FB_HELPER_DEFAULT_OPS,
150 	.fb_setcolreg = psbfb_setcolreg,
151 	.fb_fillrect = drm_fb_helper_cfb_fillrect,
152 	.fb_copyarea = drm_fb_helper_cfb_copyarea,
153 	.fb_imageblit = drm_fb_helper_cfb_imageblit,
154 	.fb_mmap = psbfb_mmap,
155 };
156 
157 /**
158  *	psb_framebuffer_init	-	initialize a framebuffer
159  *	@dev: our DRM device
160  *	@fb: framebuffer to set up
161  *	@mode_cmd: mode description
162  *	@obj: backing object
163  *
164  *	Configure and fill in the boilerplate for our frame buffer. Return
165  *	0 on success or an error code if we fail.
166  */
167 static int psb_framebuffer_init(struct drm_device *dev,
168 					struct drm_framebuffer *fb,
169 					const struct drm_mode_fb_cmd2 *mode_cmd,
170 					struct drm_gem_object *obj)
171 {
172 	const struct drm_format_info *info;
173 	int ret;
174 
175 	/*
176 	 * Reject unknown formats, YUV formats, and formats with more than
177 	 * 4 bytes per pixel.
178 	 */
179 	info = drm_get_format_info(dev, mode_cmd);
180 	if (!info || !info->depth || info->cpp[0] > 4)
181 		return -EINVAL;
182 
183 	if (mode_cmd->pitches[0] & 63)
184 		return -EINVAL;
185 
186 	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
187 	fb->obj[0] = obj;
188 	ret = drm_framebuffer_init(dev, fb, &psb_fb_funcs);
189 	if (ret) {
190 		dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
191 		return ret;
192 	}
193 	return 0;
194 }
195 
196 /**
197  *	psb_framebuffer_create	-	create a framebuffer backed by gt
198  *	@dev: our DRM device
199  *	@mode_cmd: the description of the requested mode
200  *	@obj: the backing object
201  *
202  *	Create a framebuffer object backed by the gt, and fill in the
203  *	boilerplate required
204  *
205  *	TODO: review object references
206  */
207 
208 static struct drm_framebuffer *psb_framebuffer_create
209 			(struct drm_device *dev,
210 			 const struct drm_mode_fb_cmd2 *mode_cmd,
211 			 struct drm_gem_object *obj)
212 {
213 	struct drm_framebuffer *fb;
214 	int ret;
215 
216 	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
217 	if (!fb)
218 		return ERR_PTR(-ENOMEM);
219 
220 	ret = psb_framebuffer_init(dev, fb, mode_cmd, obj);
221 	if (ret) {
222 		kfree(fb);
223 		return ERR_PTR(ret);
224 	}
225 	return fb;
226 }
227 
228 /**
229  *	psbfb_alloc		-	allocate frame buffer memory
230  *	@dev: the DRM device
231  *	@aligned_size: space needed
232  *
233  *	Allocate the frame buffer. In the usual case we get a GTT range that
234  *	is stolen memory backed and life is simple. If there isn't sufficient
235  *	we fail as we don't have the virtual mapping space to really vmap it
236  *	and the kernel console code can't handle non linear framebuffers.
237  *
238  *	Re-address this as and if the framebuffer layer grows this ability.
239  */
240 static struct gtt_range *psbfb_alloc(struct drm_device *dev, int aligned_size)
241 {
242 	struct gtt_range *backing;
243 	/* Begin by trying to use stolen memory backing */
244 	backing = psb_gtt_alloc_range(dev, aligned_size, "fb", 1, PAGE_SIZE);
245 	if (backing) {
246 		backing->gem.funcs = &psb_gem_object_funcs;
247 		drm_gem_private_object_init(dev, &backing->gem, aligned_size);
248 		return backing;
249 	}
250 	return NULL;
251 }
252 
253 /**
254  *	psbfb_create		-	create a framebuffer
255  *	@fb_helper: the framebuffer helper
256  *	@sizes: specification of the layout
257  *
258  *	Create a framebuffer to the specifications provided
259  */
260 static int psbfb_create(struct drm_fb_helper *fb_helper,
261 				struct drm_fb_helper_surface_size *sizes)
262 {
263 	struct drm_device *dev = fb_helper->dev;
264 	struct drm_psb_private *dev_priv = dev->dev_private;
265 	struct pci_dev *pdev = to_pci_dev(dev->dev);
266 	struct fb_info *info;
267 	struct drm_framebuffer *fb;
268 	struct drm_mode_fb_cmd2 mode_cmd;
269 	int size;
270 	int ret;
271 	struct gtt_range *backing;
272 	u32 bpp, depth;
273 
274 	mode_cmd.width = sizes->surface_width;
275 	mode_cmd.height = sizes->surface_height;
276 	bpp = sizes->surface_bpp;
277 	depth = sizes->surface_depth;
278 
279 	/* No 24bit packed */
280 	if (bpp == 24)
281 		bpp = 32;
282 
283 	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64);
284 
285 	size = mode_cmd.pitches[0] * mode_cmd.height;
286 	size = ALIGN(size, PAGE_SIZE);
287 
288 	/* Allocate the framebuffer in the GTT with stolen page backing */
289 	backing = psbfb_alloc(dev, size);
290 	if (backing == NULL)
291 		return -ENOMEM;
292 
293 	memset(dev_priv->vram_addr + backing->offset, 0, size);
294 
295 	info = drm_fb_helper_alloc_fbi(fb_helper);
296 	if (IS_ERR(info)) {
297 		ret = PTR_ERR(info);
298 		goto out;
299 	}
300 
301 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);
302 
303 	fb = psb_framebuffer_create(dev, &mode_cmd, &backing->gem);
304 	if (IS_ERR(fb)) {
305 		ret = PTR_ERR(fb);
306 		goto out;
307 	}
308 
309 	fb_helper->fb = fb;
310 
311 	info->fbops = &psbfb_unaccel_ops;
312 
313 	info->fix.smem_start = dev->mode_config.fb_base;
314 	info->fix.smem_len = size;
315 	info->fix.ywrapstep = 0;
316 	info->fix.ypanstep = 0;
317 
318 	/* Accessed stolen memory directly */
319 	info->screen_base = dev_priv->vram_addr + backing->offset;
320 	info->screen_size = size;
321 
322 	if (dev_priv->gtt.stolen_size) {
323 		info->apertures->ranges[0].base = dev->mode_config.fb_base;
324 		info->apertures->ranges[0].size = dev_priv->gtt.stolen_size;
325 	}
326 
327 	drm_fb_helper_fill_info(info, fb_helper, sizes);
328 
329 	info->fix.mmio_start = pci_resource_start(pdev, 0);
330 	info->fix.mmio_len = pci_resource_len(pdev, 0);
331 
332 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
333 
334 	dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);
335 
336 	return 0;
337 out:
338 	psb_gtt_free_range(dev, backing);
339 	return ret;
340 }
341 
342 /**
343  *	psb_user_framebuffer_create	-	create framebuffer
344  *	@dev: our DRM device
345  *	@filp: client file
346  *	@cmd: mode request
347  *
348  *	Create a new framebuffer backed by a userspace GEM object
349  */
350 static struct drm_framebuffer *psb_user_framebuffer_create
351 			(struct drm_device *dev, struct drm_file *filp,
352 			 const struct drm_mode_fb_cmd2 *cmd)
353 {
354 	struct drm_gem_object *obj;
355 	struct drm_framebuffer *fb;
356 
357 	/*
358 	 *	Find the GEM object and thus the gtt range object that is
359 	 *	to back this space
360 	 */
361 	obj = drm_gem_object_lookup(filp, cmd->handles[0]);
362 	if (obj == NULL)
363 		return ERR_PTR(-ENOENT);
364 
365 	/* Let the core code do all the work */
366 	fb = psb_framebuffer_create(dev, cmd, obj);
367 	if (IS_ERR(fb))
368 		drm_gem_object_put(obj);
369 
370 	return fb;
371 }
372 
373 static int psbfb_probe(struct drm_fb_helper *fb_helper,
374 				struct drm_fb_helper_surface_size *sizes)
375 {
376 	struct drm_device *dev = fb_helper->dev;
377 	struct drm_psb_private *dev_priv = dev->dev_private;
378 	unsigned int fb_size;
379 	int bytespp;
380 
381 	bytespp = sizes->surface_bpp / 8;
382 	if (bytespp == 3)	/* no 24bit packed */
383 		bytespp = 4;
384 
385 	/* If the mode will not fit in 32bit then switch to 16bit to get
386 	   a console on full resolution. The X mode setting server will
387 	   allocate its own 32bit GEM framebuffer */
388 	fb_size = ALIGN(sizes->surface_width * bytespp, 64) *
389 		  sizes->surface_height;
390 	fb_size = ALIGN(fb_size, PAGE_SIZE);
391 
392 	if (fb_size > dev_priv->vram_stolen_size) {
393                 sizes->surface_bpp = 16;
394                 sizes->surface_depth = 16;
395         }
396 
397 	return psbfb_create(fb_helper, sizes);
398 }
399 
400 static const struct drm_fb_helper_funcs psb_fb_helper_funcs = {
401 	.fb_probe = psbfb_probe,
402 };
403 
404 static int psb_fbdev_destroy(struct drm_device *dev,
405 			     struct drm_fb_helper *fb_helper)
406 {
407 	struct drm_framebuffer *fb = fb_helper->fb;
408 
409 	drm_fb_helper_unregister_fbi(fb_helper);
410 
411 	drm_fb_helper_fini(fb_helper);
412 	drm_framebuffer_unregister_private(fb);
413 	drm_framebuffer_cleanup(fb);
414 
415 	if (fb->obj[0])
416 		drm_gem_object_put(fb->obj[0]);
417 	kfree(fb);
418 
419 	return 0;
420 }
421 
422 int psb_fbdev_init(struct drm_device *dev)
423 {
424 	struct drm_fb_helper *fb_helper;
425 	struct drm_psb_private *dev_priv = dev->dev_private;
426 	int ret;
427 
428 	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
429 	if (!fb_helper) {
430 		dev_err(dev->dev, "no memory\n");
431 		return -ENOMEM;
432 	}
433 
434 	dev_priv->fb_helper = fb_helper;
435 
436 	drm_fb_helper_prepare(dev, fb_helper, &psb_fb_helper_funcs);
437 
438 	ret = drm_fb_helper_init(dev, fb_helper);
439 	if (ret)
440 		goto free;
441 
442 	/* disable all the possible outputs/crtcs before entering KMS mode */
443 	drm_helper_disable_unused_functions(dev);
444 
445 	ret = drm_fb_helper_initial_config(fb_helper, 32);
446 	if (ret)
447 		goto fini;
448 
449 	return 0;
450 
451 fini:
452 	drm_fb_helper_fini(fb_helper);
453 free:
454 	kfree(fb_helper);
455 	return ret;
456 }
457 
458 static void psb_fbdev_fini(struct drm_device *dev)
459 {
460 	struct drm_psb_private *dev_priv = dev->dev_private;
461 
462 	if (!dev_priv->fb_helper)
463 		return;
464 
465 	psb_fbdev_destroy(dev, dev_priv->fb_helper);
466 	kfree(dev_priv->fb_helper);
467 	dev_priv->fb_helper = NULL;
468 }
469 
470 static const struct drm_mode_config_funcs psb_mode_funcs = {
471 	.fb_create = psb_user_framebuffer_create,
472 	.output_poll_changed = drm_fb_helper_output_poll_changed,
473 };
474 
475 static void psb_setup_outputs(struct drm_device *dev)
476 {
477 	struct drm_psb_private *dev_priv = dev->dev_private;
478 	struct drm_connector *connector;
479 
480 	drm_mode_create_scaling_mode_property(dev);
481 
482 	/* It is ok for this to fail - we just don't get backlight control */
483 	if (!dev_priv->backlight_property)
484 		dev_priv->backlight_property = drm_property_create_range(dev, 0,
485 							"backlight", 0, 100);
486 	dev_priv->ops->output_init(dev);
487 
488 	list_for_each_entry(connector, &dev->mode_config.connector_list,
489 			    head) {
490 		struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
491 		struct drm_encoder *encoder = &gma_encoder->base;
492 		int crtc_mask = 0, clone_mask = 0;
493 
494 		/* valid crtcs */
495 		switch (gma_encoder->type) {
496 		case INTEL_OUTPUT_ANALOG:
497 			crtc_mask = (1 << 0);
498 			clone_mask = (1 << INTEL_OUTPUT_ANALOG);
499 			break;
500 		case INTEL_OUTPUT_SDVO:
501 			crtc_mask = dev_priv->ops->sdvo_mask;
502 			clone_mask = 0;
503 			break;
504 		case INTEL_OUTPUT_LVDS:
505 			crtc_mask = dev_priv->ops->lvds_mask;
506 			clone_mask = 0;
507 			break;
508 		case INTEL_OUTPUT_MIPI:
509 			crtc_mask = (1 << 0);
510 			clone_mask = 0;
511 			break;
512 		case INTEL_OUTPUT_MIPI2:
513 			crtc_mask = (1 << 2);
514 			clone_mask = 0;
515 			break;
516 		case INTEL_OUTPUT_HDMI:
517 			crtc_mask = dev_priv->ops->hdmi_mask;
518 			clone_mask = (1 << INTEL_OUTPUT_HDMI);
519 			break;
520 		case INTEL_OUTPUT_DISPLAYPORT:
521 			crtc_mask = (1 << 0) | (1 << 1);
522 			clone_mask = 0;
523 			break;
524 		case INTEL_OUTPUT_EDP:
525 			crtc_mask = (1 << 1);
526 			clone_mask = 0;
527 		}
528 		encoder->possible_crtcs = crtc_mask;
529 		encoder->possible_clones =
530 		    gma_connector_clones(dev, clone_mask);
531 	}
532 }
533 
534 void psb_modeset_init(struct drm_device *dev)
535 {
536 	struct drm_psb_private *dev_priv = dev->dev_private;
537 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
538 	struct pci_dev *pdev = to_pci_dev(dev->dev);
539 	int i;
540 
541 	drm_mode_config_init(dev);
542 
543 	dev->mode_config.min_width = 0;
544 	dev->mode_config.min_height = 0;
545 
546 	dev->mode_config.funcs = &psb_mode_funcs;
547 
548 	/* set memory base */
549 	/* Oaktrail and Poulsbo should use BAR 2*/
550 	pci_read_config_dword(pdev, PSB_BSM, (u32 *)&(dev->mode_config.fb_base));
551 
552 	/* num pipes is 2 for PSB but 1 for Mrst */
553 	for (i = 0; i < dev_priv->num_pipe; i++)
554 		psb_intel_crtc_init(dev, i, mode_dev);
555 
556 	dev->mode_config.max_width = 4096;
557 	dev->mode_config.max_height = 4096;
558 
559 	psb_setup_outputs(dev);
560 
561 	if (dev_priv->ops->errata)
562 	        dev_priv->ops->errata(dev);
563 
564         dev_priv->modeset = true;
565 }
566 
567 void psb_modeset_cleanup(struct drm_device *dev)
568 {
569 	struct drm_psb_private *dev_priv = dev->dev_private;
570 	if (dev_priv->modeset) {
571 		drm_kms_helper_poll_fini(dev);
572 		psb_fbdev_fini(dev);
573 		drm_mode_config_cleanup(dev);
574 	}
575 }
576