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