2 * Framebuffer driver for EFI/UEFI based system
4 * (c) 2006 Edgar Hucek <gimli@dark-green.com>
5 * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
9 #include <linux/kernel.h>
10 #include <linux/efi.h>
11 #include <linux/errno.h>
13 #include <linux/pci.h>
14 #include <linux/platform_device.h>
15 #include <linux/screen_info.h>
16 #include <video/vga.h>
19 static bool request_mem_succeeded = false;
21 static struct fb_var_screeninfo efifb_defined = {
22 .activate = FB_ACTIVATE_NOW,
29 .vmode = FB_VMODE_NONINTERLACED,
32 static struct fb_fix_screeninfo efifb_fix = {
34 .type = FB_TYPE_PACKED_PIXELS,
35 .accel = FB_ACCEL_NONE,
36 .visual = FB_VISUAL_TRUECOLOR,
39 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
40 unsigned blue, unsigned transp,
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.
50 if (regno >= info->cmap.len)
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);
65 static void efifb_destroy(struct fb_info *info)
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);
75 static struct fb_ops efifb_ops = {
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,
84 static int efifb_setup(char *options)
88 if (options && *options) {
89 while ((this_opt = strsep(&options, ",")) != NULL) {
90 if (!*this_opt) continue;
92 efifb_setup_from_dmi(&screen_info, this_opt);
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);
108 static inline bool fb_base_is_valid(void)
110 if (screen_info.lfb_base)
113 if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
116 if (screen_info.ext_lfb_base)
122 #define efifb_attr_decl(name, fmt) \
123 static ssize_t name##_show(struct device *dev, \
124 struct device_attribute *attr, \
127 return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
129 static DEVICE_ATTR_RO(name)
131 efifb_attr_decl(base, "0x%x");
132 efifb_attr_decl(linelength, "%u");
133 efifb_attr_decl(height, "%u");
134 efifb_attr_decl(width, "%u");
135 efifb_attr_decl(depth, "%u");
137 static struct attribute *efifb_attrs[] = {
139 &dev_attr_linelength.attr,
140 &dev_attr_width.attr,
141 &dev_attr_height.attr,
142 &dev_attr_depth.attr,
145 ATTRIBUTE_GROUPS(efifb);
147 static bool pci_dev_disabled; /* FB base matches BAR of a disabled device */
149 static int efifb_probe(struct platform_device *dev)
151 struct fb_info *info;
153 unsigned int size_vmode;
154 unsigned int size_remap;
155 unsigned int size_total;
158 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
161 if (fb_get_options("efifb", &option))
165 /* We don't get linelength from UGA Draw Protocol, only from
166 * EFI Graphics Protocol. So if it's not in DMI, and it's not
167 * passed in from the user, we really can't use the framebuffer.
169 if (!screen_info.lfb_linelength)
172 if (!screen_info.lfb_depth)
173 screen_info.lfb_depth = 32;
174 if (!screen_info.pages)
175 screen_info.pages = 1;
176 if (!fb_base_is_valid()) {
177 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
180 printk(KERN_INFO "efifb: probing for efifb\n");
182 /* just assume they're all unset if any are */
183 if (!screen_info.blue_size) {
184 screen_info.blue_size = 8;
185 screen_info.blue_pos = 0;
186 screen_info.green_size = 8;
187 screen_info.green_pos = 8;
188 screen_info.red_size = 8;
189 screen_info.red_pos = 16;
190 screen_info.rsvd_size = 8;
191 screen_info.rsvd_pos = 24;
194 efifb_fix.smem_start = screen_info.lfb_base;
196 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
199 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
200 efifb_fix.smem_start |= ext_lfb_base;
203 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
204 efifb_defined.xres = screen_info.lfb_width;
205 efifb_defined.yres = screen_info.lfb_height;
206 efifb_fix.line_length = screen_info.lfb_linelength;
208 /* size_vmode -- that is the amount of memory needed for the
209 * used video mode, i.e. the minimum amount of
211 size_vmode = efifb_defined.yres * efifb_fix.line_length;
213 /* size_total -- all video memory we have. Used for
214 * entries, ressource allocation and bounds
216 size_total = screen_info.lfb_size;
217 if (size_total < size_vmode)
218 size_total = size_vmode;
220 /* size_remap -- the amount of video memory we are going to
221 * use for efifb. With modern cards it is no
222 * option to simply use size_total as that
223 * wastes plenty of kernel address space. */
224 size_remap = size_vmode * 2;
225 if (size_remap > size_total)
226 size_remap = size_total;
227 if (size_remap % PAGE_SIZE)
228 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
229 efifb_fix.smem_len = size_remap;
231 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
232 request_mem_succeeded = true;
234 /* We cannot make this fatal. Sometimes this comes from magic
235 spaces our resource handlers simply don't know about */
236 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
237 efifb_fix.smem_start);
240 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
242 pr_err("efifb: cannot allocate framebuffer\n");
244 goto err_release_mem;
246 platform_set_drvdata(dev, info);
247 info->pseudo_palette = info->par;
250 info->apertures = alloc_apertures(1);
251 if (!info->apertures) {
255 info->apertures->ranges[0].base = efifb_fix.smem_start;
256 info->apertures->ranges[0].size = size_remap;
258 info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
259 if (!info->screen_base) {
260 pr_err("efifb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
261 efifb_fix.smem_len, efifb_fix.smem_start);
266 pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
267 efifb_fix.smem_start, size_remap/1024, size_total/1024);
268 pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
269 efifb_defined.xres, efifb_defined.yres,
270 efifb_defined.bits_per_pixel, efifb_fix.line_length,
273 efifb_defined.xres_virtual = efifb_defined.xres;
274 efifb_defined.yres_virtual = efifb_fix.smem_len /
275 efifb_fix.line_length;
276 pr_info("efifb: scrolling: redraw\n");
277 efifb_defined.yres_virtual = efifb_defined.yres;
279 /* some dummy values for timing to make fbset happy */
280 efifb_defined.pixclock = 10000000 / efifb_defined.xres *
281 1000 / efifb_defined.yres;
282 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
283 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
285 efifb_defined.red.offset = screen_info.red_pos;
286 efifb_defined.red.length = screen_info.red_size;
287 efifb_defined.green.offset = screen_info.green_pos;
288 efifb_defined.green.length = screen_info.green_size;
289 efifb_defined.blue.offset = screen_info.blue_pos;
290 efifb_defined.blue.length = screen_info.blue_size;
291 efifb_defined.transp.offset = screen_info.rsvd_pos;
292 efifb_defined.transp.length = screen_info.rsvd_size;
294 pr_info("efifb: %s: "
295 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
297 screen_info.rsvd_size,
298 screen_info.red_size,
299 screen_info.green_size,
300 screen_info.blue_size,
301 screen_info.rsvd_pos,
303 screen_info.green_pos,
304 screen_info.blue_pos);
306 efifb_fix.ypanstep = 0;
307 efifb_fix.ywrapstep = 0;
309 info->fbops = &efifb_ops;
310 info->var = efifb_defined;
311 info->fix = efifb_fix;
312 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
314 err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
316 pr_err("efifb: cannot add sysfs attrs\n");
319 err = fb_alloc_cmap(&info->cmap, 256, 0);
321 pr_err("efifb: cannot allocate colormap\n");
324 err = register_framebuffer(info);
326 pr_err("efifb: cannot register framebuffer\n");
329 fb_info(info, "%s frame buffer device\n", info->fix.id);
333 fb_dealloc_cmap(&info->cmap);
335 sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
337 iounmap(info->screen_base);
339 framebuffer_release(info);
341 if (request_mem_succeeded)
342 release_mem_region(efifb_fix.smem_start, size_total);
346 static int efifb_remove(struct platform_device *pdev)
348 struct fb_info *info = platform_get_drvdata(pdev);
350 unregister_framebuffer(info);
351 sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
352 framebuffer_release(info);
357 static struct platform_driver efifb_driver = {
359 .name = "efi-framebuffer",
361 .probe = efifb_probe,
362 .remove = efifb_remove,
365 builtin_platform_driver(efifb_driver);
367 #if defined(CONFIG_PCI) && !defined(CONFIG_X86)
369 static bool pci_bar_found; /* did we find a BAR matching the efifb base? */
371 static void claim_efifb_bar(struct pci_dev *dev, int idx)
375 pci_bar_found = true;
377 pci_read_config_word(dev, PCI_COMMAND, &word);
378 if (!(word & PCI_COMMAND_MEMORY)) {
379 pci_dev_disabled = true;
381 "BAR %d: assigned to efifb but device is disabled!\n",
386 if (pci_claim_resource(dev, idx)) {
387 pci_dev_disabled = true;
389 "BAR %d: failed to claim resource for efifb!\n", idx);
393 dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
396 static void efifb_fixup_resources(struct pci_dev *dev)
398 u64 base = screen_info.lfb_base;
399 u64 size = screen_info.lfb_size;
402 if (pci_bar_found || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
405 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
406 base |= (u64)screen_info.ext_lfb_base << 32;
411 for (i = 0; i < PCI_STD_RESOURCE_END; i++) {
412 struct resource *res = &dev->resource[i];
414 if (!(res->flags & IORESOURCE_MEM))
417 if (res->start <= base && res->end >= base + size - 1) {
418 claim_efifb_bar(dev, i);
423 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
424 16, efifb_fixup_resources);