tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
17#include <video/vga.h>
18
19static struct fb_var_screeninfo efifb_defined __initdata = {
20 .activate = FB_ACTIVATE_NOW,
21 .height = -1,
22 .width = -1,
23 .right_margin = 32,
24 .upper_margin = 16,
25 .lower_margin = 4,
26 .vsync_len = 4,
27 .vmode = FB_VMODE_NONINTERLACED,
28};
29
30static struct fb_fix_screeninfo efifb_fix __initdata = {
31 .id = "EFI VGA",
32 .type = FB_TYPE_PACKED_PIXELS,
33 .accel = FB_ACCEL_NONE,
34 .visual = FB_VISUAL_TRUECOLOR,
35};
36
37enum {
38 M_I17, /* 17-Inch iMac */
39 M_I20, /* 20-Inch iMac */
40 M_I20_SR, /* 20-Inch iMac (Santa Rosa) */
41 M_I24, /* 24-Inch iMac */
42 M_MINI, /* Mac Mini */
43 M_MB, /* MacBook */
44 M_MB_2, /* MacBook, 2nd rev. */
45 M_MB_3, /* MacBook, 3rd rev. */
46 M_MB_SR, /* MacBook, 2nd gen, (Santa Rosa) */
47 M_MBA, /* MacBook Air */
48 M_MBP, /* MacBook Pro */
49 M_MBP_2, /* MacBook Pro 2nd gen */
50 M_MBP_SR, /* MacBook Pro (Santa Rosa) */
51 M_MBP_4, /* MacBook Pro, 4th gen */
52 M_UNKNOWN /* placeholder */
53};
54
55static struct efifb_dmi_info {
56 char *optname;
57 unsigned long base;
58 int stride;
59 int width;
60 int height;
61} dmi_list[] = {
62 [M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900 },
63 [M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050 }, /* guess */
64 [M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050 },
65 [M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200 }, /* guess */
66 [M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768 },
67 [M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800 },
68 [M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800 },
69 [M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900 },
70 [M_MBP_2] = { "mbp2", 0, 0, 0, 0 }, /* placeholder */
71 [M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900 },
72 [M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200 },
73 [M_UNKNOWN] = { NULL, 0, 0, 0, 0 }
74};
75
76static int set_system(const struct dmi_system_id *id);
77
78#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid) \
79 { set_system, name, { \
80 DMI_MATCH(DMI_BIOS_VENDOR, vendor), \
81 DMI_MATCH(DMI_PRODUCT_NAME, name) }, \
82 &dmi_list[enumid] }
83
84static struct dmi_system_id __initdata dmi_system_table[] = {
85 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
86 /* At least one of these two will be right; maybe both? */
87 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
88 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
89 /* At least one of these two will be right; maybe both? */
90 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
91 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
92 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
93 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
94 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
95 /* At least one of these two will be right; maybe both? */
96 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
97 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
98 /* At least one of these two will be right; maybe both? */
99 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
100 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
101 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
102 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
103 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
104 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
105 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
106 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
107 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
108 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
109 {},
110};
111
112static int set_system(const struct dmi_system_id *id)
113{
114 struct efifb_dmi_info *info = id->driver_data;
115 if (info->base == 0)
116 return -ENODEV;
117
118 printk(KERN_INFO "efifb: dmi detected %s - framebuffer at %p "
119 "(%dx%d, stride %d)\n", id->ident,
120 (void *)info->base, info->width, info->height,
121 info->stride);
122
123 /* Trust the bootloader over the DMI tables */
124 if (screen_info.lfb_base == 0)
125 screen_info.lfb_base = info->base;
126 if (screen_info.lfb_linelength == 0)
127 screen_info.lfb_linelength = info->stride;
128 if (screen_info.lfb_width == 0)
129 screen_info.lfb_width = info->width;
130 if (screen_info.lfb_height == 0)
131 screen_info.lfb_height = info->height;
132
133 return 0;
134}
135
136static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
137 unsigned blue, unsigned transp,
138 struct fb_info *info)
139{
140 /*
141 * Set a single color register. The values supplied are
142 * already rounded down to the hardware's capabilities
143 * (according to the entries in the `var' structure). Return
144 * != 0 for invalid regno.
145 */
146
147 if (regno >= info->cmap.len)
148 return 1;
149
150 if (regno < 16) {
151 red >>= 8;
152 green >>= 8;
153 blue >>= 8;
154 ((u32 *)(info->pseudo_palette))[regno] =
155 (red << info->var.red.offset) |
156 (green << info->var.green.offset) |
157 (blue << info->var.blue.offset);
158 }
159 return 0;
160}
161
162static struct fb_ops efifb_ops = {
163 .owner = THIS_MODULE,
164 .fb_setcolreg = efifb_setcolreg,
165 .fb_fillrect = cfb_fillrect,
166 .fb_copyarea = cfb_copyarea,
167 .fb_imageblit = cfb_imageblit,
168};
169
170static int __init efifb_setup(char *options)
171{
172 char *this_opt;
173 int i;
174
175 if (!options || !*options)
176 return 0;
177
178 while ((this_opt = strsep(&options, ",")) != NULL) {
179 if (!*this_opt) continue;
180
181 for (i = 0; i < M_UNKNOWN; i++) {
182 if (!strcmp(this_opt, dmi_list[i].optname) &&
183 dmi_list[i].base != 0) {
184 screen_info.lfb_base = dmi_list[i].base;
185 screen_info.lfb_linelength = dmi_list[i].stride;
186 screen_info.lfb_width = dmi_list[i].width;
187 screen_info.lfb_height = dmi_list[i].height;
188 }
189 }
190 if (!strncmp(this_opt, "base:", 5))
191 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
192 else if (!strncmp(this_opt, "stride:", 7))
193 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
194 else if (!strncmp(this_opt, "height:", 7))
195 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
196 else if (!strncmp(this_opt, "width:", 6))
197 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
198 }
199 return 0;
200}
201
202static int __init efifb_probe(struct platform_device *dev)
203{
204 struct fb_info *info;
205 int err;
206 unsigned int size_vmode;
207 unsigned int size_remap;
208 unsigned int size_total;
209 int request_succeeded = 0;
210
211 printk(KERN_INFO "efifb: probing for efifb\n");
212
213 if (!screen_info.lfb_depth)
214 screen_info.lfb_depth = 32;
215 if (!screen_info.pages)
216 screen_info.pages = 1;
217
218 /* just assume they're all unset if any are */
219 if (!screen_info.blue_size) {
220 screen_info.blue_size = 8;
221 screen_info.blue_pos = 0;
222 screen_info.green_size = 8;
223 screen_info.green_pos = 8;
224 screen_info.red_size = 8;
225 screen_info.red_pos = 16;
226 screen_info.rsvd_size = 8;
227 screen_info.rsvd_pos = 24;
228 }
229
230 efifb_fix.smem_start = screen_info.lfb_base;
231 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
232 efifb_defined.xres = screen_info.lfb_width;
233 efifb_defined.yres = screen_info.lfb_height;
234 efifb_fix.line_length = screen_info.lfb_linelength;
235
236 /* size_vmode -- that is the amount of memory needed for the
237 * used video mode, i.e. the minimum amount of
238 * memory we need. */
239 size_vmode = efifb_defined.yres * efifb_fix.line_length;
240
241 /* size_total -- all video memory we have. Used for
242 * entries, ressource allocation and bounds
243 * checking. */
244 size_total = screen_info.lfb_size;
245 if (size_total < size_vmode)
246 size_total = size_vmode;
247
248 /* size_remap -- the amount of video memory we are going to
249 * use for efifb. With modern cards it is no
250 * option to simply use size_total as that
251 * wastes plenty of kernel address space. */
252 size_remap = size_vmode * 2;
253 if (size_remap > size_total)
254 size_remap = size_total;
255 if (size_remap % PAGE_SIZE)
256 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
257 efifb_fix.smem_len = size_remap;
258
259 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
260 request_succeeded = 1;
261 } else {
262 /* We cannot make this fatal. Sometimes this comes from magic
263 spaces our resource handlers simply don't know about */
264 printk(KERN_WARNING
265 "efifb: cannot reserve video memory at 0x%lx\n",
266 efifb_fix.smem_start);
267 }
268
269 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
270 if (!info) {
271 printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
272 err = -ENOMEM;
273 goto err_release_mem;
274 }
275 info->pseudo_palette = info->par;
276 info->par = NULL;
277
278 info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
279 if (!info->screen_base) {
280 printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
281 "0x%x @ 0x%lx\n",
282 efifb_fix.smem_len, efifb_fix.smem_start);
283 err = -EIO;
284 goto err_release_fb;
285 }
286
287 printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
288 "using %dk, total %dk\n",
289 efifb_fix.smem_start, info->screen_base,
290 size_remap/1024, size_total/1024);
291 printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
292 efifb_defined.xres, efifb_defined.yres,
293 efifb_defined.bits_per_pixel, efifb_fix.line_length,
294 screen_info.pages);
295
296 efifb_defined.xres_virtual = efifb_defined.xres;
297 efifb_defined.yres_virtual = efifb_fix.smem_len /
298 efifb_fix.line_length;
299 printk(KERN_INFO "efifb: scrolling: redraw\n");
300 efifb_defined.yres_virtual = efifb_defined.yres;
301
302 /* some dummy values for timing to make fbset happy */
303 efifb_defined.pixclock = 10000000 / efifb_defined.xres *
304 1000 / efifb_defined.yres;
305 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
306 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
307
308 efifb_defined.red.offset = screen_info.red_pos;
309 efifb_defined.red.length = screen_info.red_size;
310 efifb_defined.green.offset = screen_info.green_pos;
311 efifb_defined.green.length = screen_info.green_size;
312 efifb_defined.blue.offset = screen_info.blue_pos;
313 efifb_defined.blue.length = screen_info.blue_size;
314 efifb_defined.transp.offset = screen_info.rsvd_pos;
315 efifb_defined.transp.length = screen_info.rsvd_size;
316
317 printk(KERN_INFO "efifb: %s: "
318 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
319 "Truecolor",
320 screen_info.rsvd_size,
321 screen_info.red_size,
322 screen_info.green_size,
323 screen_info.blue_size,
324 screen_info.rsvd_pos,
325 screen_info.red_pos,
326 screen_info.green_pos,
327 screen_info.blue_pos);
328
329 efifb_fix.ypanstep = 0;
330 efifb_fix.ywrapstep = 0;
331
332 info->fbops = &efifb_ops;
333 info->var = efifb_defined;
334 info->fix = efifb_fix;
335 info->flags = FBINFO_FLAG_DEFAULT;
336
337 if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
338 printk(KERN_ERR "efifb: cannot allocate colormap\n");
339 goto err_unmap;
340 }
341 if ((err = register_framebuffer(info)) < 0) {
342 printk(KERN_ERR "efifb: cannot register framebuffer\n");
343 goto err_fb_dealoc;
344 }
345 printk(KERN_INFO "fb%d: %s frame buffer device\n",
346 info->node, info->fix.id);
347 return 0;
348
349err_fb_dealoc:
350 fb_dealloc_cmap(&info->cmap);
351err_unmap:
352 iounmap(info->screen_base);
353err_release_fb:
354 framebuffer_release(info);
355err_release_mem:
356 if (request_succeeded)
357 release_mem_region(efifb_fix.smem_start, size_total);
358 return err;
359}
360
361static struct platform_driver efifb_driver = {
362 .probe = efifb_probe,
363 .driver = {
364 .name = "efifb",
365 },
366};
367
368static struct platform_device efifb_device = {
369 .name = "efifb",
370};
371
372static int __init efifb_init(void)
373{
374 int ret;
375 char *option = NULL;
376
377 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
378 return -ENODEV;
379 dmi_check_system(dmi_system_table);
380
381 if (fb_get_options("efifb", &option))
382 return -ENODEV;
383 efifb_setup(option);
384
385 /* We don't get linelength from UGA Draw Protocol, only from
386 * EFI Graphics Protocol. So if it's not in DMI, and it's not
387 * passed in from the user, we really can't use the framebuffer.
388 */
389 if (!screen_info.lfb_linelength)
390 return -ENODEV;
391
392 ret = platform_driver_register(&efifb_driver);
393
394 if (!ret) {
395 ret = platform_device_register(&efifb_device);
396 if (ret)
397 platform_driver_unregister(&efifb_driver);
398 }
399 return ret;
400}
401module_init(efifb_init);
402
403MODULE_LICENSE("GPL");