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/fb.h>
9#include <linux/pfn_t.h>
10
11#include <drm/drm_crtc_helper.h>
12#include <drm/drm_drv.h>
13#include <drm/drm_fb_helper.h>
14#include <drm/drm_framebuffer.h>
15
16#include "gem.h"
17#include "psb_drv.h"
18
19/*
20 * VM area struct
21 */
22
23static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf)
24{
25	struct vm_area_struct *vma = vmf->vma;
26	struct fb_info *info = vma->vm_private_data;
27	unsigned long address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
28	unsigned long pfn = info->fix.smem_start >> PAGE_SHIFT;
29	vm_fault_t err = VM_FAULT_SIGBUS;
30	unsigned long page_num = vma_pages(vma);
31	unsigned long i;
32
33	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
34
35	for (i = 0; i < page_num; ++i) {
36		err = vmf_insert_mixed(vma, address, __pfn_to_pfn_t(pfn, PFN_DEV));
37		if (unlikely(err & VM_FAULT_ERROR))
38			break;
39		address += PAGE_SIZE;
40		++pfn;
41	}
42
43	return err;
44}
45
46static const struct vm_operations_struct psb_fbdev_vm_ops = {
47	.fault	= psb_fbdev_vm_fault,
48};
49
50/*
51 * struct fb_ops
52 */
53
54#define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
55
56static int psb_fbdev_fb_setcolreg(unsigned int regno,
57				  unsigned int red, unsigned int green,
58				  unsigned int blue, unsigned int transp,
59				  struct fb_info *info)
60{
61	struct drm_fb_helper *fb_helper = info->par;
62	struct drm_framebuffer *fb = fb_helper->fb;
63	uint32_t v;
64
65	if (!fb)
66		return -ENOMEM;
67
68	if (regno > 255)
69		return 1;
70
71	red = CMAP_TOHW(red, info->var.red.length);
72	blue = CMAP_TOHW(blue, info->var.blue.length);
73	green = CMAP_TOHW(green, info->var.green.length);
74	transp = CMAP_TOHW(transp, info->var.transp.length);
75
76	v = (red << info->var.red.offset) |
77	    (green << info->var.green.offset) |
78	    (blue << info->var.blue.offset) |
79	    (transp << info->var.transp.offset);
80
81	if (regno < 16) {
82		switch (fb->format->cpp[0] * 8) {
83		case 16:
84			((uint32_t *) info->pseudo_palette)[regno] = v;
85			break;
86		case 24:
87		case 32:
88			((uint32_t *) info->pseudo_palette)[regno] = v;
89			break;
90		}
91	}
92
93	return 0;
94}
95
96static int psb_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
97{
98	if (vma->vm_pgoff != 0)
99		return -EINVAL;
100	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
101		return -EINVAL;
102
103	/*
104	 * If this is a GEM object then info->screen_base is the virtual
105	 * kernel remapping of the object. FIXME: Review if this is
106	 * suitable for our mmap work
107	 */
108	vma->vm_ops = &psb_fbdev_vm_ops;
109	vma->vm_private_data = info;
110	vm_flags_set(vma, VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP);
111
112	return 0;
113}
114
115static void psb_fbdev_fb_destroy(struct fb_info *info)
116{
117	struct drm_fb_helper *fb_helper = info->par;
118	struct drm_framebuffer *fb = fb_helper->fb;
119	struct drm_gem_object *obj = fb->obj[0];
120
121	drm_fb_helper_fini(fb_helper);
122
123	drm_framebuffer_unregister_private(fb);
124	fb->obj[0] = NULL;
125	drm_framebuffer_cleanup(fb);
126	kfree(fb);
127
128	drm_gem_object_put(obj);
129
130	drm_client_release(&fb_helper->client);
131
132	drm_fb_helper_unprepare(fb_helper);
133	kfree(fb_helper);
134}
135
136static const struct fb_ops psb_fbdev_fb_ops = {
137	.owner = THIS_MODULE,
138	__FB_DEFAULT_IOMEM_OPS_RDWR,
139	DRM_FB_HELPER_DEFAULT_OPS,
140	.fb_setcolreg = psb_fbdev_fb_setcolreg,
141	__FB_DEFAULT_IOMEM_OPS_DRAW,
142	.fb_mmap = psb_fbdev_fb_mmap,
143	.fb_destroy = psb_fbdev_fb_destroy,
144};
145
146/*
147 * struct drm_fb_helper_funcs
148 */
149
150static int psb_fbdev_fb_probe(struct drm_fb_helper *fb_helper,
151			      struct drm_fb_helper_surface_size *sizes)
152{
153	struct drm_device *dev = fb_helper->dev;
154	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
155	struct pci_dev *pdev = to_pci_dev(dev->dev);
156	struct fb_info *info;
157	struct drm_framebuffer *fb;
158	struct drm_mode_fb_cmd2 mode_cmd = { };
159	int size;
160	int ret;
161	struct psb_gem_object *backing;
162	struct drm_gem_object *obj;
163	u32 bpp, depth;
164
165	/* No 24-bit packed mode */
166	if (sizes->surface_bpp == 24) {
167		sizes->surface_bpp = 32;
168		sizes->surface_depth = 24;
169	}
170	bpp = sizes->surface_bpp;
171	depth = sizes->surface_depth;
172
173	/*
174	 * If the mode does not fit in 32 bit then switch to 16 bit to get
175	 * a console on full resolution. The X mode setting server will
176	 * allocate its own 32-bit GEM framebuffer.
177	 */
178	size = ALIGN(sizes->surface_width * DIV_ROUND_UP(bpp, 8), 64) *
179		     sizes->surface_height;
180	size = ALIGN(size, PAGE_SIZE);
181
182	if (size > dev_priv->vram_stolen_size) {
183		sizes->surface_bpp = 16;
184		sizes->surface_depth = 16;
185	}
186	bpp = sizes->surface_bpp;
187	depth = sizes->surface_depth;
188
189	mode_cmd.width = sizes->surface_width;
190	mode_cmd.height = sizes->surface_height;
191	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64);
192	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);
193
194	size = mode_cmd.pitches[0] * mode_cmd.height;
195	size = ALIGN(size, PAGE_SIZE);
196
197	/* Allocate the framebuffer in the GTT with stolen page backing */
198	backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE);
199	if (IS_ERR(backing))
200		return PTR_ERR(backing);
201	obj = &backing->base;
202
203	fb = psb_framebuffer_create(dev, &mode_cmd, obj);
204	if (IS_ERR(fb)) {
205		ret = PTR_ERR(fb);
206		goto err_drm_gem_object_put;
207	}
208
209	fb_helper->fb = fb;
210
211	info = drm_fb_helper_alloc_info(fb_helper);
212	if (IS_ERR(info)) {
213		ret = PTR_ERR(info);
214		goto err_drm_framebuffer_unregister_private;
215	}
216
217	info->fbops = &psb_fbdev_fb_ops;
218
219	/* Accessed stolen memory directly */
220	info->screen_base = dev_priv->vram_addr + backing->offset;
221	info->screen_size = size;
222
223	drm_fb_helper_fill_info(info, fb_helper, sizes);
224
225	info->fix.smem_start = dev_priv->stolen_base + backing->offset;
226	info->fix.smem_len = size;
227	info->fix.ywrapstep = 0;
228	info->fix.ypanstep = 0;
229	info->fix.mmio_start = pci_resource_start(pdev, 0);
230	info->fix.mmio_len = pci_resource_len(pdev, 0);
231
232	fb_memset_io(info->screen_base, 0, info->screen_size);
233
234	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
235
236	dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);
237
238	return 0;
239
240err_drm_framebuffer_unregister_private:
241	drm_framebuffer_unregister_private(fb);
242	fb->obj[0] = NULL;
243	drm_framebuffer_cleanup(fb);
244	kfree(fb);
245err_drm_gem_object_put:
246	drm_gem_object_put(obj);
247	return ret;
248}
249
250static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
251	.fb_probe = psb_fbdev_fb_probe,
252};
253
254/*
255 * struct drm_client_funcs and setup code
256 */
257
258static void psb_fbdev_client_unregister(struct drm_client_dev *client)
259{
260	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
261
262	if (fb_helper->info) {
263		drm_fb_helper_unregister_info(fb_helper);
264	} else {
265		drm_fb_helper_unprepare(fb_helper);
266		drm_client_release(&fb_helper->client);
267		kfree(fb_helper);
268	}
269}
270
271static int psb_fbdev_client_restore(struct drm_client_dev *client)
272{
273	drm_fb_helper_lastclose(client->dev);
274
275	return 0;
276}
277
278static int psb_fbdev_client_hotplug(struct drm_client_dev *client)
279{
280	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
281	struct drm_device *dev = client->dev;
282	int ret;
283
284	if (dev->fb_helper)
285		return drm_fb_helper_hotplug_event(dev->fb_helper);
286
287	ret = drm_fb_helper_init(dev, fb_helper);
288	if (ret)
289		goto err_drm_err;
290
291	if (!drm_drv_uses_atomic_modeset(dev))
292		drm_helper_disable_unused_functions(dev);
293
294	ret = drm_fb_helper_initial_config(fb_helper);
295	if (ret)
296		goto err_drm_fb_helper_fini;
297
298	return 0;
299
300err_drm_fb_helper_fini:
301	drm_fb_helper_fini(fb_helper);
302err_drm_err:
303	drm_err(dev, "Failed to setup gma500 fbdev emulation (ret=%d)\n", ret);
304	return ret;
305}
306
307static const struct drm_client_funcs psb_fbdev_client_funcs = {
308	.owner		= THIS_MODULE,
309	.unregister	= psb_fbdev_client_unregister,
310	.restore	= psb_fbdev_client_restore,
311	.hotplug	= psb_fbdev_client_hotplug,
312};
313
314void psb_fbdev_setup(struct drm_psb_private *dev_priv)
315{
316	struct drm_device *dev = &dev_priv->dev;
317	struct drm_fb_helper *fb_helper;
318	int ret;
319
320	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
321	if (!fb_helper)
322		return;
323	drm_fb_helper_prepare(dev, fb_helper, 32, &psb_fbdev_fb_helper_funcs);
324
325	ret = drm_client_init(dev, &fb_helper->client, "fbdev-gma500", &psb_fbdev_client_funcs);
326	if (ret) {
327		drm_err(dev, "Failed to register client: %d\n", ret);
328		goto err_drm_fb_helper_unprepare;
329	}
330
331	drm_client_register(&fb_helper->client);
332
333	return;
334
335err_drm_fb_helper_unprepare:
336	drm_fb_helper_unprepare(fb_helper);
337	kfree(fb_helper);
338}
339