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