Merge branch 'linus' into stackprotector
[linux-2.6] / drivers / video / efifb.c
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
19 static 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
30 static 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
37 enum {
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
55 static 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
76 static 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
84 static 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
112 static 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
136 static 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
162 static 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
170 static 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
202 static 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
349 err_fb_dealoc:
350         fb_dealloc_cmap(&info->cmap);
351 err_unmap:
352         iounmap(info->screen_base);
353 err_release_fb:
354         framebuffer_release(info);
355 err_release_mem:
356         if (request_succeeded)
357                 release_mem_region(efifb_fix.smem_start, size_total);
358         return err;
359 }
360
361 static struct platform_driver efifb_driver = {
362         .probe  = efifb_probe,
363         .driver = {
364                 .name   = "efifb",
365         },
366 };
367
368 static struct platform_device efifb_device = {
369         .name   = "efifb",
370 };
371
372 static 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 }
401 module_init(efifb_init);
402
403 MODULE_LICENSE("GPL");