1 /*
2 * Framebuffer driver for EFI/UEFI based system
3 *
4 * (c) 2006 Edgar Hucek <gimli@dark-green.com>
5 * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
6 *
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/efi.h>
11 #include <linux/errno.h>
12 #include <linux/fb.h>
13 #include <linux/pci.h>
14 #include <linux/platform_device.h>
15 #include <linux/screen_info.h>
16 #include <video/vga.h>
17 #include <asm/efi.h>
18
19 static bool request_mem_succeeded = false;
20
21 static struct fb_var_screeninfo efifb_defined = {
22 .activate = FB_ACTIVATE_NOW,
23 .height = -1,
24 .width = -1,
25 .right_margin = 32,
26 .upper_margin = 16,
27 .lower_margin = 4,
28 .vsync_len = 4,
29 .vmode = FB_VMODE_NONINTERLACED,
30 };
31
32 static struct fb_fix_screeninfo efifb_fix = {
33 .id = "EFI VGA",
34 .type = FB_TYPE_PACKED_PIXELS,
35 .accel = FB_ACCEL_NONE,
36 .visual = FB_VISUAL_TRUECOLOR,
37 };
38
efifb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)39 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
40 unsigned blue, unsigned transp,
41 struct fb_info *info)
42 {
43 /*
44 * Set a single color register. The values supplied are
45 * already rounded down to the hardware's capabilities
46 * (according to the entries in the `var' structure). Return
47 * != 0 for invalid regno.
48 */
49
50 if (regno >= info->cmap.len)
51 return 1;
52
53 if (regno < 16) {
54 red >>= 16 - info->var.red.length;
55 green >>= 16 - info->var.green.length;
56 blue >>= 16 - info->var.blue.length;
57 ((u32 *)(info->pseudo_palette))[regno] =
58 (red << info->var.red.offset) |
59 (green << info->var.green.offset) |
60 (blue << info->var.blue.offset);
61 }
62 return 0;
63 }
64
efifb_destroy(struct fb_info * info)65 static void efifb_destroy(struct fb_info *info)
66 {
67 if (info->screen_base)
68 iounmap(info->screen_base);
69 if (request_mem_succeeded)
70 release_mem_region(info->apertures->ranges[0].base,
71 info->apertures->ranges[0].size);
72 fb_dealloc_cmap(&info->cmap);
73 }
74
75 static struct fb_ops efifb_ops = {
76 .owner = THIS_MODULE,
77 .fb_destroy = efifb_destroy,
78 .fb_setcolreg = efifb_setcolreg,
79 .fb_fillrect = cfb_fillrect,
80 .fb_copyarea = cfb_copyarea,
81 .fb_imageblit = cfb_imageblit,
82 };
83
efifb_setup(char * options)84 static int efifb_setup(char *options)
85 {
86 char *this_opt;
87
88 if (options && *options) {
89 while ((this_opt = strsep(&options, ",")) != NULL) {
90 if (!*this_opt) continue;
91
92 efifb_setup_from_dmi(&screen_info, this_opt);
93
94 if (!strncmp(this_opt, "base:", 5))
95 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
96 else if (!strncmp(this_opt, "stride:", 7))
97 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
98 else if (!strncmp(this_opt, "height:", 7))
99 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
100 else if (!strncmp(this_opt, "width:", 6))
101 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
102 }
103 }
104
105 return 0;
106 }
107
fb_base_is_valid(void)108 static inline bool fb_base_is_valid(void)
109 {
110 if (screen_info.lfb_base)
111 return true;
112
113 if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
114 return false;
115
116 if (screen_info.ext_lfb_base)
117 return true;
118
119 return false;
120 }
121
122 static bool pci_dev_disabled; /* FB base matches BAR of a disabled device */
123
efifb_probe(struct platform_device * dev)124 static int efifb_probe(struct platform_device *dev)
125 {
126 struct fb_info *info;
127 int err;
128 unsigned int size_vmode;
129 unsigned int size_remap;
130 unsigned int size_total;
131 char *option = NULL;
132
133 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
134 return -ENODEV;
135
136 if (fb_get_options("efifb", &option))
137 return -ENODEV;
138 efifb_setup(option);
139
140 /* We don't get linelength from UGA Draw Protocol, only from
141 * EFI Graphics Protocol. So if it's not in DMI, and it's not
142 * passed in from the user, we really can't use the framebuffer.
143 */
144 if (!screen_info.lfb_linelength)
145 return -ENODEV;
146
147 if (!screen_info.lfb_depth)
148 screen_info.lfb_depth = 32;
149 if (!screen_info.pages)
150 screen_info.pages = 1;
151 if (!fb_base_is_valid()) {
152 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
153 return -ENODEV;
154 }
155 printk(KERN_INFO "efifb: probing for efifb\n");
156
157 /* just assume they're all unset if any are */
158 if (!screen_info.blue_size) {
159 screen_info.blue_size = 8;
160 screen_info.blue_pos = 0;
161 screen_info.green_size = 8;
162 screen_info.green_pos = 8;
163 screen_info.red_size = 8;
164 screen_info.red_pos = 16;
165 screen_info.rsvd_size = 8;
166 screen_info.rsvd_pos = 24;
167 }
168
169 efifb_fix.smem_start = screen_info.lfb_base;
170
171 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
172 u64 ext_lfb_base;
173
174 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
175 efifb_fix.smem_start |= ext_lfb_base;
176 }
177
178 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
179 efifb_defined.xres = screen_info.lfb_width;
180 efifb_defined.yres = screen_info.lfb_height;
181 efifb_fix.line_length = screen_info.lfb_linelength;
182
183 /* size_vmode -- that is the amount of memory needed for the
184 * used video mode, i.e. the minimum amount of
185 * memory we need. */
186 size_vmode = efifb_defined.yres * efifb_fix.line_length;
187
188 /* size_total -- all video memory we have. Used for
189 * entries, ressource allocation and bounds
190 * checking. */
191 size_total = screen_info.lfb_size;
192 if (size_total < size_vmode)
193 size_total = size_vmode;
194
195 /* size_remap -- the amount of video memory we are going to
196 * use for efifb. With modern cards it is no
197 * option to simply use size_total as that
198 * wastes plenty of kernel address space. */
199 size_remap = size_vmode * 2;
200 if (size_remap > size_total)
201 size_remap = size_total;
202 if (size_remap % PAGE_SIZE)
203 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
204 efifb_fix.smem_len = size_remap;
205
206 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
207 request_mem_succeeded = true;
208 } else {
209 /* We cannot make this fatal. Sometimes this comes from magic
210 spaces our resource handlers simply don't know about */
211 printk(KERN_WARNING
212 "efifb: cannot reserve video memory at 0x%lx\n",
213 efifb_fix.smem_start);
214 }
215
216 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
217 if (!info) {
218 printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
219 err = -ENOMEM;
220 goto err_release_mem;
221 }
222 platform_set_drvdata(dev, info);
223 info->pseudo_palette = info->par;
224 info->par = NULL;
225
226 info->apertures = alloc_apertures(1);
227 if (!info->apertures) {
228 err = -ENOMEM;
229 goto err_release_fb;
230 }
231 info->apertures->ranges[0].base = efifb_fix.smem_start;
232 info->apertures->ranges[0].size = size_remap;
233
234 info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
235 if (!info->screen_base) {
236 printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
237 "0x%x @ 0x%lx\n",
238 efifb_fix.smem_len, efifb_fix.smem_start);
239 err = -EIO;
240 goto err_release_fb;
241 }
242
243 printk(KERN_INFO "efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
244 efifb_fix.smem_start, size_remap/1024, size_total/1024);
245 printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
246 efifb_defined.xres, efifb_defined.yres,
247 efifb_defined.bits_per_pixel, efifb_fix.line_length,
248 screen_info.pages);
249
250 efifb_defined.xres_virtual = efifb_defined.xres;
251 efifb_defined.yres_virtual = efifb_fix.smem_len /
252 efifb_fix.line_length;
253 printk(KERN_INFO "efifb: scrolling: redraw\n");
254 efifb_defined.yres_virtual = efifb_defined.yres;
255
256 /* some dummy values for timing to make fbset happy */
257 efifb_defined.pixclock = 10000000 / efifb_defined.xres *
258 1000 / efifb_defined.yres;
259 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
260 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
261
262 efifb_defined.red.offset = screen_info.red_pos;
263 efifb_defined.red.length = screen_info.red_size;
264 efifb_defined.green.offset = screen_info.green_pos;
265 efifb_defined.green.length = screen_info.green_size;
266 efifb_defined.blue.offset = screen_info.blue_pos;
267 efifb_defined.blue.length = screen_info.blue_size;
268 efifb_defined.transp.offset = screen_info.rsvd_pos;
269 efifb_defined.transp.length = screen_info.rsvd_size;
270
271 printk(KERN_INFO "efifb: %s: "
272 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
273 "Truecolor",
274 screen_info.rsvd_size,
275 screen_info.red_size,
276 screen_info.green_size,
277 screen_info.blue_size,
278 screen_info.rsvd_pos,
279 screen_info.red_pos,
280 screen_info.green_pos,
281 screen_info.blue_pos);
282
283 efifb_fix.ypanstep = 0;
284 efifb_fix.ywrapstep = 0;
285
286 info->fbops = &efifb_ops;
287 info->var = efifb_defined;
288 info->fix = efifb_fix;
289 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
290
291 if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
292 printk(KERN_ERR "efifb: cannot allocate colormap\n");
293 goto err_unmap;
294 }
295 if ((err = register_framebuffer(info)) < 0) {
296 printk(KERN_ERR "efifb: cannot register framebuffer\n");
297 goto err_fb_dealoc;
298 }
299 fb_info(info, "%s frame buffer device\n", info->fix.id);
300 return 0;
301
302 err_fb_dealoc:
303 fb_dealloc_cmap(&info->cmap);
304 err_unmap:
305 iounmap(info->screen_base);
306 err_release_fb:
307 framebuffer_release(info);
308 err_release_mem:
309 if (request_mem_succeeded)
310 release_mem_region(efifb_fix.smem_start, size_total);
311 return err;
312 }
313
efifb_remove(struct platform_device * pdev)314 static int efifb_remove(struct platform_device *pdev)
315 {
316 struct fb_info *info = platform_get_drvdata(pdev);
317
318 unregister_framebuffer(info);
319 framebuffer_release(info);
320
321 return 0;
322 }
323
324 static struct platform_driver efifb_driver = {
325 .driver = {
326 .name = "efi-framebuffer",
327 },
328 .probe = efifb_probe,
329 .remove = efifb_remove,
330 };
331
332 builtin_platform_driver(efifb_driver);
333
334 #if defined(CONFIG_PCI) && !defined(CONFIG_X86)
335
336 static bool pci_bar_found; /* did we find a BAR matching the efifb base? */
337
claim_efifb_bar(struct pci_dev * dev,int idx)338 static void claim_efifb_bar(struct pci_dev *dev, int idx)
339 {
340 u16 word;
341
342 pci_bar_found = true;
343
344 pci_read_config_word(dev, PCI_COMMAND, &word);
345 if (!(word & PCI_COMMAND_MEMORY)) {
346 pci_dev_disabled = true;
347 dev_err(&dev->dev,
348 "BAR %d: assigned to efifb but device is disabled!\n",
349 idx);
350 return;
351 }
352
353 if (pci_claim_resource(dev, idx)) {
354 pci_dev_disabled = true;
355 dev_err(&dev->dev,
356 "BAR %d: failed to claim resource for efifb!\n", idx);
357 return;
358 }
359
360 dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
361 }
362
efifb_fixup_resources(struct pci_dev * dev)363 static void efifb_fixup_resources(struct pci_dev *dev)
364 {
365 u64 base = screen_info.lfb_base;
366 u64 size = screen_info.lfb_size;
367 int i;
368
369 if (pci_bar_found || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
370 return;
371
372 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
373 base |= (u64)screen_info.ext_lfb_base << 32;
374
375 if (!base)
376 return;
377
378 for (i = 0; i < PCI_STD_RESOURCE_END; i++) {
379 struct resource *res = &dev->resource[i];
380
381 if (!(res->flags & IORESOURCE_MEM))
382 continue;
383
384 if (res->start <= base && res->end >= base + size - 1) {
385 claim_efifb_bar(dev, i);
386 break;
387 }
388 }
389 }
390 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
391 16, efifb_fixup_resources);
392
393 #endif
394