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
27static char mode_option[32] = "640x480-16@60";
28static int  crt_option = 1;
29static char panel_option[32] = "";
30
31/* Modes relevant to the GX1 (taken from modedb.c) */
32static const struct fb_videomode __devinitdata 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
87static 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
100static 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
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	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
150static 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
157static 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
191static 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
198static int __devinit 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
240static 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
259static 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
271static struct fb_info * __devinit 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
321static int __devinit 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		fb_dealloc_cmap(&info->cmap);
379		framebuffer_release(info);
380	}
381
382	return ret;
383}
384
385static void __devexit 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	pci_set_drvdata(pdev, NULL);
403
404	framebuffer_release(info);
405}
406
407#ifndef MODULE
408static void __init gx1fb_setup(char *options)
409{
410	char *this_opt;
411
412	if (!options || !*options)
413		return;
414
415	while ((this_opt = strsep(&options, ","))) {
416		if (!*this_opt)
417			continue;
418
419		if (!strncmp(this_opt, "mode:", 5))
420			strlcpy(mode_option, this_opt + 5, sizeof(mode_option));
421		else if (!strncmp(this_opt, "crt:", 4))
422			crt_option = !!simple_strtoul(this_opt + 4, NULL, 0);
423		else if (!strncmp(this_opt, "panel:", 6))
424			strlcpy(panel_option, this_opt + 6, sizeof(panel_option));
425		else
426			strlcpy(mode_option, this_opt, sizeof(mode_option));
427	}
428}
429#endif
430
431static struct pci_device_id gx1fb_id_table[] = {
432	{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_VIDEO,
433	  PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
434	  0xff0000, 0 },
435	{ 0, }
436};
437
438MODULE_DEVICE_TABLE(pci, gx1fb_id_table);
439
440static struct pci_driver gx1fb_driver = {
441	.name		= "gx1fb",
442	.id_table	= gx1fb_id_table,
443	.probe		= gx1fb_probe,
444	.remove		= __devexit_p(gx1fb_remove),
445};
446
447static int __init gx1fb_init(void)
448{
449#ifndef MODULE
450	char *option = NULL;
451
452	if (fb_get_options("gx1fb", &option))
453		return -ENODEV;
454	gx1fb_setup(option);
455#endif
456	return pci_register_driver(&gx1fb_driver);
457}
458
459static void __devexit gx1fb_cleanup(void)
460{
461	pci_unregister_driver(&gx1fb_driver);
462}
463
464module_init(gx1fb_init);
465module_exit(gx1fb_cleanup);
466
467module_param_string(mode, mode_option, sizeof(mode_option), 0444);
468MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
469
470module_param_named(crt, crt_option, int, 0444);
471MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)");
472
473module_param_string(panel, panel_option, sizeof(panel_option), 0444);
474MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)");
475
476MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1");
477MODULE_LICENSE("GPL");
478