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[linux.git] / drivers / video / fbdev / geode / gx1fb_core.c
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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");
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