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