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