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