1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Geode GX framebuffer driver.
4 *
5 * Copyright (C) 2006 Arcom Control Systems Ltd.
6 *
7 * This driver assumes that the BIOS has created a virtual PCI device header
8 * for the video device. The PCI header is assumed to contain the following
9 * BARs:
10 *
11 * BAR0 - framebuffer memory
12 * BAR1 - graphics processor registers
13 * BAR2 - display controller registers
14 * BAR3 - video processor and flat panel control registers.
15 *
16 * 16 MiB of framebuffer memory is assumed to be available.
17 */
18 #include <linux/aperture.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/string.h>
23 #include <linux/mm.h>
24 #include <linux/delay.h>
25 #include <linux/fb.h>
26 #include <linux/console.h>
27 #include <linux/suspend.h>
28 #include <linux/init.h>
29 #include <linux/pci.h>
30 #include <linux/cs5535.h>
31
32 #include <asm/olpc.h>
33
34 #include "gxfb.h"
35
36 static char *mode_option;
37 static int vram;
38 static int vt_switch;
39
40 /* Modes relevant to the GX (taken from modedb.c) */
41 static struct fb_videomode gx_modedb[] = {
42 /* 640x480-60 VESA */
43 { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2,
44 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
45 /* 640x480-75 VESA */
46 { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
47 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
48 /* 640x480-85 VESA */
49 { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
50 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
51 /* 800x600-60 VESA */
52 { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
53 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
54 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
55 /* 800x600-75 VESA */
56 { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
57 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
58 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
59 /* 800x600-85 VESA */
60 { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
61 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
62 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
63 /* 1024x768-60 VESA */
64 { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
65 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
66 /* 1024x768-75 VESA */
67 { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
68 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
69 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
70 /* 1024x768-85 VESA */
71 { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
72 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
73 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
74 /* 1280x960-60 VESA */
75 { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
76 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
77 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
78 /* 1280x960-85 VESA */
79 { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
80 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
81 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
82 /* 1280x1024-60 VESA */
83 { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
84 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
85 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
86 /* 1280x1024-75 VESA */
87 { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
88 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
89 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
90 /* 1280x1024-85 VESA */
91 { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
92 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
93 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
94 /* 1600x1200-60 VESA */
95 { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
96 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
97 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
98 /* 1600x1200-75 VESA */
99 { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
100 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
101 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
102 /* 1600x1200-85 VESA */
103 { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
104 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
105 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
106 };
107
108 static struct fb_videomode gx_dcon_modedb[] = {
109 /* The only mode the DCON has is 1200x900 */
110 { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
111 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
112 FB_VMODE_NONINTERLACED, 0 }
113 };
114
get_modedb(struct fb_videomode ** modedb,unsigned int * size)115 static void get_modedb(struct fb_videomode **modedb, unsigned int *size)
116 {
117 if (olpc_has_dcon()) {
118 *modedb = (struct fb_videomode *) gx_dcon_modedb;
119 *size = ARRAY_SIZE(gx_dcon_modedb);
120 } else {
121 *modedb = (struct fb_videomode *) gx_modedb;
122 *size = ARRAY_SIZE(gx_modedb);
123 }
124 }
125
gxfb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)126 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
127 {
128 if (var->xres > 1600 || var->yres > 1200)
129 return -EINVAL;
130 if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
131 return -EINVAL;
132
133 if (var->bits_per_pixel == 32) {
134 var->red.offset = 16; var->red.length = 8;
135 var->green.offset = 8; var->green.length = 8;
136 var->blue.offset = 0; var->blue.length = 8;
137 } else if (var->bits_per_pixel == 16) {
138 var->red.offset = 11; var->red.length = 5;
139 var->green.offset = 5; var->green.length = 6;
140 var->blue.offset = 0; var->blue.length = 5;
141 } else if (var->bits_per_pixel == 8) {
142 var->red.offset = 0; var->red.length = 8;
143 var->green.offset = 0; var->green.length = 8;
144 var->blue.offset = 0; var->blue.length = 8;
145 } else
146 return -EINVAL;
147 var->transp.offset = 0; var->transp.length = 0;
148
149 /* Enough video memory? */
150 if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
151 return -EINVAL;
152
153 /* FIXME: Check timing parameters here? */
154
155 return 0;
156 }
157
gxfb_set_par(struct fb_info * info)158 static int gxfb_set_par(struct fb_info *info)
159 {
160 if (info->var.bits_per_pixel > 8)
161 info->fix.visual = FB_VISUAL_TRUECOLOR;
162 else
163 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
164
165 info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
166
167 gx_set_mode(info);
168
169 return 0;
170 }
171
chan_to_field(u_int chan,struct fb_bitfield * bf)172 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
173 {
174 chan &= 0xffff;
175 chan >>= 16 - bf->length;
176 return chan << bf->offset;
177 }
178
gxfb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)179 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
180 unsigned blue, unsigned transp,
181 struct fb_info *info)
182 {
183 if (info->var.grayscale) {
184 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
185 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
186 }
187
188 /* Truecolor has hardware independent palette */
189 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
190 u32 *pal = info->pseudo_palette;
191 u32 v;
192
193 if (regno >= 16)
194 return -EINVAL;
195
196 v = chan_to_field(red, &info->var.red);
197 v |= chan_to_field(green, &info->var.green);
198 v |= chan_to_field(blue, &info->var.blue);
199
200 pal[regno] = v;
201 } else {
202 if (regno >= 256)
203 return -EINVAL;
204
205 gx_set_hw_palette_reg(info, regno, red, green, blue);
206 }
207
208 return 0;
209 }
210
gxfb_blank(int blank_mode,struct fb_info * info)211 static int gxfb_blank(int blank_mode, struct fb_info *info)
212 {
213 return gx_blank_display(info, blank_mode);
214 }
215
gxfb_map_video_memory(struct fb_info * info,struct pci_dev * dev)216 static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
217 {
218 struct gxfb_par *par = info->par;
219 int ret;
220
221 ret = pci_enable_device(dev);
222 if (ret < 0)
223 return ret;
224
225 ret = pci_request_region(dev, 3, "gxfb (video processor)");
226 if (ret < 0)
227 return ret;
228 par->vid_regs = pci_ioremap_bar(dev, 3);
229 if (!par->vid_regs)
230 return -ENOMEM;
231
232 ret = pci_request_region(dev, 2, "gxfb (display controller)");
233 if (ret < 0)
234 return ret;
235 par->dc_regs = pci_ioremap_bar(dev, 2);
236 if (!par->dc_regs)
237 return -ENOMEM;
238
239 ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
240 if (ret < 0)
241 return ret;
242 par->gp_regs = pci_ioremap_bar(dev, 1);
243
244 if (!par->gp_regs)
245 return -ENOMEM;
246
247 ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
248 if (ret < 0)
249 return ret;
250
251 info->fix.smem_start = pci_resource_start(dev, 0);
252 info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
253 info->screen_base = ioremap_wc(info->fix.smem_start,
254 info->fix.smem_len);
255 if (!info->screen_base)
256 return -ENOMEM;
257
258 /* Set the 16MiB aligned base address of the graphics memory region
259 * in the display controller */
260
261 write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
262
263 dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
264 info->fix.smem_len / 1024, info->fix.smem_start);
265
266 return 0;
267 }
268
269 static const struct fb_ops gxfb_ops = {
270 .owner = THIS_MODULE,
271 .fb_check_var = gxfb_check_var,
272 .fb_set_par = gxfb_set_par,
273 .fb_setcolreg = gxfb_setcolreg,
274 .fb_blank = gxfb_blank,
275 /* No HW acceleration for now. */
276 .fb_fillrect = cfb_fillrect,
277 .fb_copyarea = cfb_copyarea,
278 .fb_imageblit = cfb_imageblit,
279 };
280
gxfb_init_fbinfo(struct device * dev)281 static struct fb_info *gxfb_init_fbinfo(struct device *dev)
282 {
283 struct gxfb_par *par;
284 struct fb_info *info;
285
286 /* Alloc enough space for the pseudo palette. */
287 info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,
288 dev);
289 if (!info)
290 return NULL;
291
292 par = info->par;
293
294 strcpy(info->fix.id, "Geode GX");
295
296 info->fix.type = FB_TYPE_PACKED_PIXELS;
297 info->fix.type_aux = 0;
298 info->fix.xpanstep = 0;
299 info->fix.ypanstep = 0;
300 info->fix.ywrapstep = 0;
301 info->fix.accel = FB_ACCEL_NONE;
302
303 info->var.nonstd = 0;
304 info->var.activate = FB_ACTIVATE_NOW;
305 info->var.height = -1;
306 info->var.width = -1;
307 info->var.accel_flags = 0;
308 info->var.vmode = FB_VMODE_NONINTERLACED;
309
310 info->fbops = &gxfb_ops;
311 info->flags = FBINFO_DEFAULT;
312 info->node = -1;
313
314 info->pseudo_palette = (void *)par + sizeof(struct gxfb_par);
315
316 info->var.grayscale = 0;
317
318 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
319 framebuffer_release(info);
320 return NULL;
321 }
322
323 return info;
324 }
325
gxfb_suspend(struct device * dev)326 static int __maybe_unused gxfb_suspend(struct device *dev)
327 {
328 struct fb_info *info = dev_get_drvdata(dev);
329
330 console_lock();
331 gx_powerdown(info);
332 fb_set_suspend(info, 1);
333 console_unlock();
334
335 /* there's no point in setting PCI states; we emulate PCI, so
336 * we don't end up getting power savings anyways */
337
338 return 0;
339 }
340
gxfb_resume(struct device * dev)341 static int __maybe_unused gxfb_resume(struct device *dev)
342 {
343 struct fb_info *info = dev_get_drvdata(dev);
344 int ret;
345
346 console_lock();
347 ret = gx_powerup(info);
348 if (ret) {
349 printk(KERN_ERR "gxfb: power up failed!\n");
350 return ret;
351 }
352
353 fb_set_suspend(info, 0);
354 console_unlock();
355 return 0;
356 }
357
gxfb_probe(struct pci_dev * pdev,const struct pci_device_id * id)358 static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
359 {
360 struct gxfb_par *par;
361 struct fb_info *info;
362 int ret;
363 unsigned long val;
364
365 struct fb_videomode *modedb_ptr;
366 unsigned int modedb_size;
367
368 ret = aperture_remove_conflicting_pci_devices(pdev, "gxfb");
369 if (ret)
370 return ret;
371
372 info = gxfb_init_fbinfo(&pdev->dev);
373 if (!info)
374 return -ENOMEM;
375 par = info->par;
376
377 if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
378 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
379 goto err;
380 }
381
382 /* Figure out if this is a TFT or CRT part */
383
384 rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
385
386 if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
387 par->enable_crt = 0;
388 else
389 par->enable_crt = 1;
390
391 get_modedb(&modedb_ptr, &modedb_size);
392 ret = fb_find_mode(&info->var, info, mode_option,
393 modedb_ptr, modedb_size, NULL, 16);
394 if (ret == 0 || ret == 4) {
395 dev_err(&pdev->dev, "could not find valid video mode\n");
396 ret = -EINVAL;
397 goto err;
398 }
399
400
401 /* Clear the frame buffer of garbage. */
402 memset_io(info->screen_base, 0, info->fix.smem_len);
403
404 gxfb_check_var(&info->var, info);
405 gxfb_set_par(info);
406
407 pm_set_vt_switch(vt_switch);
408
409 if (register_framebuffer(info) < 0) {
410 ret = -EINVAL;
411 goto err;
412 }
413 pci_set_drvdata(pdev, info);
414 fb_info(info, "%s frame buffer device\n", info->fix.id);
415 return 0;
416
417 err:
418 if (info->screen_base) {
419 iounmap(info->screen_base);
420 pci_release_region(pdev, 0);
421 }
422 if (par->vid_regs) {
423 iounmap(par->vid_regs);
424 pci_release_region(pdev, 3);
425 }
426 if (par->dc_regs) {
427 iounmap(par->dc_regs);
428 pci_release_region(pdev, 2);
429 }
430 if (par->gp_regs) {
431 iounmap(par->gp_regs);
432 pci_release_region(pdev, 1);
433 }
434
435 fb_dealloc_cmap(&info->cmap);
436 framebuffer_release(info);
437 return ret;
438 }
439
gxfb_remove(struct pci_dev * pdev)440 static void gxfb_remove(struct pci_dev *pdev)
441 {
442 struct fb_info *info = pci_get_drvdata(pdev);
443 struct gxfb_par *par = info->par;
444
445 unregister_framebuffer(info);
446
447 iounmap((void __iomem *)info->screen_base);
448 pci_release_region(pdev, 0);
449
450 iounmap(par->vid_regs);
451 pci_release_region(pdev, 3);
452
453 iounmap(par->dc_regs);
454 pci_release_region(pdev, 2);
455
456 iounmap(par->gp_regs);
457 pci_release_region(pdev, 1);
458
459 fb_dealloc_cmap(&info->cmap);
460
461 framebuffer_release(info);
462 }
463
464 static const struct pci_device_id gxfb_id_table[] = {
465 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
466 { 0, }
467 };
468
469 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
470
471 static const struct dev_pm_ops gxfb_pm_ops = {
472 #ifdef CONFIG_PM_SLEEP
473 .suspend = gxfb_suspend,
474 .resume = gxfb_resume,
475 .freeze = NULL,
476 .thaw = gxfb_resume,
477 .poweroff = NULL,
478 .restore = gxfb_resume,
479 #endif
480 };
481
482 static struct pci_driver gxfb_driver = {
483 .name = "gxfb",
484 .id_table = gxfb_id_table,
485 .probe = gxfb_probe,
486 .remove = gxfb_remove,
487 .driver.pm = &gxfb_pm_ops,
488 };
489
490 #ifndef MODULE
gxfb_setup(char * options)491 static int __init gxfb_setup(char *options)
492 {
493
494 char *opt;
495
496 if (!options || !*options)
497 return 0;
498
499 while ((opt = strsep(&options, ",")) != NULL) {
500 if (!*opt)
501 continue;
502
503 mode_option = opt;
504 }
505
506 return 0;
507 }
508 #endif
509
gxfb_init(void)510 static int __init gxfb_init(void)
511 {
512 #ifndef MODULE
513 char *option = NULL;
514
515 if (fb_get_options("gxfb", &option))
516 return -ENODEV;
517
518 gxfb_setup(option);
519 #endif
520 return pci_register_driver(&gxfb_driver);
521 }
522
gxfb_cleanup(void)523 static void __exit gxfb_cleanup(void)
524 {
525 pci_unregister_driver(&gxfb_driver);
526 }
527
528 module_init(gxfb_init);
529 module_exit(gxfb_cleanup);
530
531 module_param(mode_option, charp, 0);
532 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
533
534 module_param(vram, int, 0);
535 MODULE_PARM_DESC(vram, "video memory size");
536
537 module_param(vt_switch, int, 0);
538 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");
539
540 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
541 MODULE_LICENSE("GPL");
542
