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, addr: address, pfn: __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(helper: fb_helper);
122
123 drm_framebuffer_unregister_private(fb);
124 fb->obj[0] = NULL;
125 drm_framebuffer_cleanup(fb);
126 kfree(objp: fb);
127
128 drm_gem_object_put(obj);
129
130 drm_client_release(client: &fb_helper->client);
131
132 drm_fb_helper_unprepare(fb_helper);
133 kfree(objp: 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, name: "fb", stolen: true, PAGE_SIZE);
199 if (IS_ERR(ptr: backing))
200 return PTR_ERR(ptr: backing);
201 obj = &backing->base;
202
203 fb = psb_framebuffer_create(dev, mode_cmd: &mode_cmd, obj);
204 if (IS_ERR(ptr: fb)) {
205 ret = PTR_ERR(ptr: 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(ptr: info)) {
213 ret = PTR_ERR(ptr: 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(addr: info->screen_base, c: 0, n: 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(objp: 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(client: &fb_helper->client);
267 kfree(objp: fb_helper);
268 }
269}
270
271static int psb_fbdev_client_restore(struct drm_client_dev *client)
272{
273 drm_fb_helper_lastclose(dev: 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(fb_helper: dev->fb_helper);
286
287 ret = drm_fb_helper_init(dev, helper: 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(helper: 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(size: sizeof(*fb_helper), GFP_KERNEL);
321 if (!fb_helper)
322 return;
323 drm_fb_helper_prepare(dev, helper: fb_helper, preferred_bpp: 32, funcs: &psb_fbdev_fb_helper_funcs);
324
325 ret = drm_client_init(dev, client: &fb_helper->client, name: "fbdev-gma500", funcs: &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(client: &fb_helper->client);
332
333 return;
334
335err_drm_fb_helper_unprepare:
336 drm_fb_helper_unprepare(fb_helper);
337 kfree(objp: fb_helper);
338}
339

source code of linux/drivers/gpu/drm/gma500/fbdev.c