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