1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * drivers/video/geode/gx1fb_core.c
4 * -- Geode GX1 framebuffer driver
5 *
6 * Copyright (C) 2005 Arcom Control Systems Ltd.
7 */
8
9 #include <linux/aperture.h>
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/mm.h>
15 #include <linux/delay.h>
16 #include <linux/fb.h>
17 #include <linux/init.h>
18 #include <linux/pci.h>
19
20 #include "geodefb.h"
21 #include "display_gx1.h"
22 #include "video_cs5530.h"
23
24 static char mode_option[32] = "640x480-16@60";
25 static int crt_option = 1;
26 static char panel_option[32] = "";
27
28 /* Modes relevant to the GX1 (taken from modedb.c) */
29 static const struct fb_videomode gx1_modedb[] = {
30 /* 640x480-60 VESA */
31 { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2,
32 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
33 /* 640x480-75 VESA */
34 { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
35 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
36 /* 640x480-85 VESA */
37 { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
38 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
39 /* 800x600-60 VESA */
40 { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
41 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
42 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
43 /* 800x600-75 VESA */
44 { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
45 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
46 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
47 /* 800x600-85 VESA */
48 { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
49 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
50 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
51 /* 1024x768-60 VESA */
52 { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
53 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
54 /* 1024x768-75 VESA */
55 { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
56 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
57 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
58 /* 1024x768-85 VESA */
59 { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
60 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
61 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
62 /* 1280x960-60 VESA */
63 { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
64 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
65 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
66 /* 1280x960-85 VESA */
67 { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
68 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
69 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
70 /* 1280x1024-60 VESA */
71 { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
72 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
73 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
74 /* 1280x1024-75 VESA */
75 { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
76 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
77 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
78 /* 1280x1024-85 VESA */
79 { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
80 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
81 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
82 };
83
gx1_line_delta(int xres,int bpp)84 static int gx1_line_delta(int xres, int bpp)
85 {
86 int line_delta = xres * (bpp >> 3);
87
88 if (line_delta > 2048)
89 line_delta = 4096;
90 else if (line_delta > 1024)
91 line_delta = 2048;
92 else
93 line_delta = 1024;
94 return line_delta;
95 }
96
gx1fb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)97 static int gx1fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
98 {
99 struct geodefb_par *par = info->par;
100
101 /* Maximum resolution is 1280x1024. */
102 if (var->xres > 1280 || var->yres > 1024)
103 return -EINVAL;
104
105 if (par->panel_x && (var->xres > par->panel_x || var->yres > par->panel_y))
106 return -EINVAL;
107
108 /* Only 16 bpp and 8 bpp is supported by the hardware. */
109 if (var->bits_per_pixel == 16) {
110 var->red.offset = 11; var->red.length = 5;
111 var->green.offset = 5; var->green.length = 6;
112 var->blue.offset = 0; var->blue.length = 5;
113 var->transp.offset = 0; var->transp.length = 0;
114 } else if (var->bits_per_pixel == 8) {
115 var->red.offset = 0; var->red.length = 8;
116 var->green.offset = 0; var->green.length = 8;
117 var->blue.offset = 0; var->blue.length = 8;
118 var->transp.offset = 0; var->transp.length = 0;
119 } else
120 return -EINVAL;
121
122 /* Enough video memory? */
123 if (gx1_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
124 return -EINVAL;
125
126 /* FIXME: Check timing parameters here? */
127
128 return 0;
129 }
130
gx1fb_set_par(struct fb_info * info)131 static int gx1fb_set_par(struct fb_info *info)
132 {
133 struct geodefb_par *par = info->par;
134
135 if (info->var.bits_per_pixel == 16)
136 info->fix.visual = FB_VISUAL_TRUECOLOR;
137 else
138 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
139
140 info->fix.line_length = gx1_line_delta(info->var.xres, info->var.bits_per_pixel);
141
142 par->dc_ops->set_mode(info);
143
144 return 0;
145 }
146
chan_to_field(u_int chan,struct fb_bitfield * bf)147 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
148 {
149 chan &= 0xffff;
150 chan >>= 16 - bf->length;
151 return chan << bf->offset;
152 }
153
gx1fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)154 static int gx1fb_setcolreg(unsigned regno, unsigned red, unsigned green,
155 unsigned blue, unsigned transp,
156 struct fb_info *info)
157 {
158 struct geodefb_par *par = info->par;
159
160 if (info->var.grayscale) {
161 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
162 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
163 }
164
165 /* Truecolor has hardware independent palette */
166 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
167 u32 *pal = info->pseudo_palette;
168 u32 v;
169
170 if (regno >= 16)
171 return -EINVAL;
172
173 v = chan_to_field(red, &info->var.red);
174 v |= chan_to_field(green, &info->var.green);
175 v |= chan_to_field(blue, &info->var.blue);
176
177 pal[regno] = v;
178 } else {
179 if (regno >= 256)
180 return -EINVAL;
181
182 par->dc_ops->set_palette_reg(info, regno, red, green, blue);
183 }
184
185 return 0;
186 }
187
gx1fb_blank(int blank_mode,struct fb_info * info)188 static int gx1fb_blank(int blank_mode, struct fb_info *info)
189 {
190 struct geodefb_par *par = info->par;
191
192 return par->vid_ops->blank_display(info, blank_mode);
193 }
194
gx1fb_map_video_memory(struct fb_info * info,struct pci_dev * dev)195 static int gx1fb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
196 {
197 struct geodefb_par *par = info->par;
198 unsigned gx_base;
199 int fb_len;
200 int ret;
201
202 gx_base = gx1_gx_base();
203 if (!gx_base)
204 return -ENODEV;
205
206 ret = pci_enable_device(dev);
207 if (ret < 0)
208 return ret;
209
210 ret = pci_request_region(dev, 0, "gx1fb (video)");
211 if (ret < 0)
212 return ret;
213 par->vid_regs = pci_ioremap_bar(dev, 0);
214 if (!par->vid_regs)
215 return -ENOMEM;
216
217 if (!request_mem_region(gx_base + 0x8300, 0x100, "gx1fb (display controller)"))
218 return -EBUSY;
219 par->dc_regs = ioremap(gx_base + 0x8300, 0x100);
220 if (!par->dc_regs)
221 return -ENOMEM;
222
223 if ((fb_len = gx1_frame_buffer_size()) < 0)
224 return -ENOMEM;
225 info->fix.smem_start = gx_base + 0x800000;
226 info->fix.smem_len = fb_len;
227 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
228 if (!info->screen_base)
229 return -ENOMEM;
230
231 dev_info(&dev->dev, "%d Kibyte of video memory at 0x%lx\n",
232 info->fix.smem_len / 1024, info->fix.smem_start);
233
234 return 0;
235 }
236
parse_panel_option(struct fb_info * info)237 static int parse_panel_option(struct fb_info *info)
238 {
239 struct geodefb_par *par = info->par;
240
241 if (strcmp(panel_option, "") != 0) {
242 int x, y;
243 char *s;
244 x = simple_strtol(panel_option, &s, 10);
245 if (!x)
246 return -EINVAL;
247 y = simple_strtol(s + 1, NULL, 10);
248 if (!y)
249 return -EINVAL;
250 par->panel_x = x;
251 par->panel_y = y;
252 }
253 return 0;
254 }
255
256 static const struct fb_ops gx1fb_ops = {
257 .owner = THIS_MODULE,
258 FB_DEFAULT_IOMEM_OPS,
259 .fb_check_var = gx1fb_check_var,
260 .fb_set_par = gx1fb_set_par,
261 .fb_setcolreg = gx1fb_setcolreg,
262 .fb_blank = gx1fb_blank,
263 };
264
gx1fb_init_fbinfo(struct device * dev)265 static struct fb_info *gx1fb_init_fbinfo(struct device *dev)
266 {
267 struct geodefb_par *par;
268 struct fb_info *info;
269
270 /* Alloc enough space for the pseudo palette. */
271 info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, dev);
272 if (!info)
273 return NULL;
274
275 par = info->par;
276
277 strcpy(info->fix.id, "GX1");
278
279 info->fix.type = FB_TYPE_PACKED_PIXELS;
280 info->fix.type_aux = 0;
281 info->fix.xpanstep = 0;
282 info->fix.ypanstep = 0;
283 info->fix.ywrapstep = 0;
284 info->fix.accel = FB_ACCEL_NONE;
285
286 info->var.nonstd = 0;
287 info->var.activate = FB_ACTIVATE_NOW;
288 info->var.height = -1;
289 info->var.width = -1;
290 info->var.accel_flags = 0;
291 info->var.vmode = FB_VMODE_NONINTERLACED;
292
293 info->fbops = &gx1fb_ops;
294 info->node = -1;
295
296 info->pseudo_palette = (void *)par + sizeof(struct geodefb_par);
297
298 info->var.grayscale = 0;
299
300 /* CRT and panel options */
301 par->enable_crt = crt_option;
302 if (parse_panel_option(info) < 0)
303 printk(KERN_WARNING "gx1fb: invalid 'panel' option -- disabling flat panel\n");
304 if (!par->panel_x)
305 par->enable_crt = 1; /* fall back to CRT if no panel is specified */
306
307 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
308 framebuffer_release(info);
309 return NULL;
310 }
311 return info;
312 }
313
gx1fb_probe(struct pci_dev * pdev,const struct pci_device_id * id)314 static int gx1fb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
315 {
316 struct geodefb_par *par;
317 struct fb_info *info;
318 int ret;
319
320 ret = aperture_remove_conflicting_pci_devices(pdev, "gx1fb");
321 if (ret)
322 return ret;
323
324 info = gx1fb_init_fbinfo(&pdev->dev);
325 if (!info)
326 return -ENOMEM;
327 par = info->par;
328
329 /* GX1 display controller and CS5530 video device */
330 par->dc_ops = &gx1_dc_ops;
331 par->vid_ops = &cs5530_vid_ops;
332
333 if ((ret = gx1fb_map_video_memory(info, pdev)) < 0) {
334 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
335 goto err;
336 }
337
338 ret = fb_find_mode(&info->var, info, mode_option,
339 gx1_modedb, ARRAY_SIZE(gx1_modedb), NULL, 16);
340 if (ret == 0 || ret == 4) {
341 dev_err(&pdev->dev, "could not find valid video mode\n");
342 ret = -EINVAL;
343 goto err;
344 }
345
346 /* Clear the frame buffer of garbage. */
347 memset_io(info->screen_base, 0, info->fix.smem_len);
348
349 gx1fb_check_var(&info->var, info);
350 gx1fb_set_par(info);
351
352 if (register_framebuffer(info) < 0) {
353 ret = -EINVAL;
354 goto err;
355 }
356 pci_set_drvdata(pdev, info);
357 fb_info(info, "%s frame buffer device\n", info->fix.id);
358 return 0;
359
360 err:
361 if (info->screen_base) {
362 iounmap(info->screen_base);
363 pci_release_region(pdev, 0);
364 }
365 if (par->vid_regs) {
366 iounmap(par->vid_regs);
367 pci_release_region(pdev, 1);
368 }
369 if (par->dc_regs) {
370 iounmap(par->dc_regs);
371 release_mem_region(gx1_gx_base() + 0x8300, 0x100);
372 }
373
374 fb_dealloc_cmap(&info->cmap);
375 framebuffer_release(info);
376
377 return ret;
378 }
379
gx1fb_remove(struct pci_dev * pdev)380 static void gx1fb_remove(struct pci_dev *pdev)
381 {
382 struct fb_info *info = pci_get_drvdata(pdev);
383 struct geodefb_par *par = info->par;
384
385 unregister_framebuffer(info);
386
387 iounmap((void __iomem *)info->screen_base);
388 pci_release_region(pdev, 0);
389
390 iounmap(par->vid_regs);
391 pci_release_region(pdev, 1);
392
393 iounmap(par->dc_regs);
394 release_mem_region(gx1_gx_base() + 0x8300, 0x100);
395
396 fb_dealloc_cmap(&info->cmap);
397
398 framebuffer_release(info);
399 }
400
401 #ifndef MODULE
gx1fb_setup(char * options)402 static void __init gx1fb_setup(char *options)
403 {
404 char *this_opt;
405
406 if (!options || !*options)
407 return;
408
409 while ((this_opt = strsep(&options, ","))) {
410 if (!*this_opt)
411 continue;
412
413 if (!strncmp(this_opt, "mode:", 5))
414 strscpy(mode_option, this_opt + 5, sizeof(mode_option));
415 else if (!strncmp(this_opt, "crt:", 4))
416 crt_option = !!simple_strtoul(this_opt + 4, NULL, 0);
417 else if (!strncmp(this_opt, "panel:", 6))
418 strscpy(panel_option, this_opt + 6, sizeof(panel_option));
419 else
420 strscpy(mode_option, this_opt, sizeof(mode_option));
421 }
422 }
423 #endif
424
425 static struct pci_device_id gx1fb_id_table[] = {
426 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_VIDEO,
427 PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
428 0xff0000, 0 },
429 { 0, }
430 };
431
432 MODULE_DEVICE_TABLE(pci, gx1fb_id_table);
433
434 static struct pci_driver gx1fb_driver = {
435 .name = "gx1fb",
436 .id_table = gx1fb_id_table,
437 .probe = gx1fb_probe,
438 .remove = gx1fb_remove,
439 };
440
gx1fb_init(void)441 static int __init gx1fb_init(void)
442 {
443 #ifndef MODULE
444 char *option = NULL;
445 #endif
446
447 if (fb_modesetting_disabled("gx1fb"))
448 return -ENODEV;
449
450 #ifndef MODULE
451 if (fb_get_options("gx1fb", &option))
452 return -ENODEV;
453 gx1fb_setup(option);
454 #endif
455 return pci_register_driver(&gx1fb_driver);
456 }
457
gx1fb_cleanup(void)458 static void gx1fb_cleanup(void)
459 {
460 pci_unregister_driver(&gx1fb_driver);
461 }
462
463 module_init(gx1fb_init);
464 module_exit(gx1fb_cleanup);
465
466 module_param_string(mode, mode_option, sizeof(mode_option), 0444);
467 MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
468
469 module_param_named(crt, crt_option, int, 0444);
470 MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)");
471
472 module_param_string(panel, panel_option, sizeof(panel_option), 0444);
473 MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)");
474
475 MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1");
476 MODULE_LICENSE("GPL");
477
