gxfb_core.c revision 9f1277bd1497858a05a80222a6e98f9c43343491 
1/*
2 * Geode GX framebuffer driver.
3 *
4 *   Copyright (C) 2006 Arcom Control Systems Ltd.
5 *
6 *   This program is free software; you can redistribute it and/or modify it
7 *   under the terms of the GNU General Public License as published by the
8 *   Free Software Foundation; either version 2 of the License, or (at your
9 *   option) any later version.
10 *
11 *
12 * This driver assumes that the BIOS has created a virtual PCI device header
13 * for the video device. The PCI header is assumed to contain the following
14 * BARs:
15 *
16 *    BAR0 - framebuffer memory
17 *    BAR1 - graphics processor registers
18 *    BAR2 - display controller registers
19 *    BAR3 - video processor and flat panel control registers.
20 *
21 * 16 MiB of framebuffer memory is assumed to be available.
22 */
23#include <linux/module.h>
24#include <linux/kernel.h>
25#include <linux/errno.h>
26#include <linux/string.h>
27#include <linux/mm.h>
28#include <linux/slab.h>
29#include <linux/delay.h>
30#include <linux/fb.h>
31#include <linux/init.h>
32#include <linux/pci.h>
33#include <asm/geode.h>
34
35#include "geodefb.h"
36#include "display_gx.h"
37#include "video_gx.h"
38#include "gxfb.h"
39
40static char *mode_option;
41static int vram;
42
43/* Modes relevant to the GX (taken from modedb.c) */
44static const struct fb_videomode gx_modedb[] __initdata = {
45	/* 640x480-60 VESA */
46	{ NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
47	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
48	/* 640x480-75 VESA */
49	{ NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
50	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
51	/* 640x480-85 VESA */
52	{ NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
53	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
54	/* 800x600-60 VESA */
55	{ NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
56	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
57	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
58	/* 800x600-75 VESA */
59	{ NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
60	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
61	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
62	/* 800x600-85 VESA */
63	{ NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
64	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
65	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
66	/* 1024x768-60 VESA */
67	{ NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
68	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
69	/* 1024x768-75 VESA */
70	{ NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
71	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
72	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
73	/* 1024x768-85 VESA */
74	{ NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
75	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
76	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
77	/* 1280x960-60 VESA */
78	{ NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
79	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
80	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
81	/* 1280x960-85 VESA */
82	{ NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
83	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
84	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
85	/* 1280x1024-60 VESA */
86	{ NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
87	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
88	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
89	/* 1280x1024-75 VESA */
90	{ NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
91	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
92	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
93	/* 1280x1024-85 VESA */
94	{ NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
95	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
96	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
97	/* 1600x1200-60 VESA */
98	{ NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
99	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
100	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
101	/* 1600x1200-75 VESA */
102	{ NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
103	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
104	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
105	/* 1600x1200-85 VESA */
106	{ NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
107	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
108	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
109};
110
111static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
112{
113	if (var->xres > 1600 || var->yres > 1200)
114		return -EINVAL;
115	if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
116		return -EINVAL;
117
118	if (var->bits_per_pixel == 32) {
119		var->red.offset   = 16; var->red.length   = 8;
120		var->green.offset =  8; var->green.length = 8;
121		var->blue.offset  =  0; var->blue.length  = 8;
122	} else if (var->bits_per_pixel == 16) {
123		var->red.offset   = 11; var->red.length   = 5;
124		var->green.offset =  5; var->green.length = 6;
125		var->blue.offset  =  0; var->blue.length  = 5;
126	} else if (var->bits_per_pixel == 8) {
127		var->red.offset   = 0; var->red.length   = 8;
128		var->green.offset = 0; var->green.length = 8;
129		var->blue.offset  = 0; var->blue.length  = 8;
130	} else
131		return -EINVAL;
132	var->transp.offset = 0; var->transp.length = 0;
133
134	/* Enough video memory? */
135	if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
136		return -EINVAL;
137
138	/* FIXME: Check timing parameters here? */
139
140	return 0;
141}
142
143static int gxfb_set_par(struct fb_info *info)
144{
145	struct geodefb_par *par = info->par;
146
147	if (info->var.bits_per_pixel > 8) {
148		info->fix.visual = FB_VISUAL_TRUECOLOR;
149		fb_dealloc_cmap(&info->cmap);
150	} else {
151		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
152		fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
153	}
154
155	info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
156
157	par->dc_ops->set_mode(info);
158
159	return 0;
160}
161
162static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
163{
164	chan &= 0xffff;
165	chan >>= 16 - bf->length;
166	return chan << bf->offset;
167}
168
169static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
170			   unsigned blue, unsigned transp,
171			   struct fb_info *info)
172{
173	struct geodefb_par *par = info->par;
174
175	if (info->var.grayscale) {
176		/* grayscale = 0.30*R + 0.59*G + 0.11*B */
177		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
178	}
179
180	/* Truecolor has hardware independent palette */
181	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
182		u32 *pal = info->pseudo_palette;
183		u32 v;
184
185		if (regno >= 16)
186			return -EINVAL;
187
188		v  = chan_to_field(red, &info->var.red);
189		v |= chan_to_field(green, &info->var.green);
190		v |= chan_to_field(blue, &info->var.blue);
191
192		pal[regno] = v;
193	} else {
194		if (regno >= 256)
195			return -EINVAL;
196
197		par->dc_ops->set_palette_reg(info, regno, red, green, blue);
198	}
199
200	return 0;
201}
202
203static int gxfb_blank(int blank_mode, struct fb_info *info)
204{
205	struct geodefb_par *par = info->par;
206
207	return par->vid_ops->blank_display(info, blank_mode);
208}
209
210static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
211{
212	struct geodefb_par *par = info->par;
213	int ret;
214
215	ret = pci_enable_device(dev);
216	if (ret < 0)
217		return ret;
218
219	ret = pci_request_region(dev, 3, "gxfb (video processor)");
220	if (ret < 0)
221		return ret;
222	par->vid_regs = ioremap(pci_resource_start(dev, 3),
223				pci_resource_len(dev, 3));
224	if (!par->vid_regs)
225		return -ENOMEM;
226
227	ret = pci_request_region(dev, 2, "gxfb (display controller)");
228	if (ret < 0)
229		return ret;
230	par->dc_regs = ioremap(pci_resource_start(dev, 2), pci_resource_len(dev, 2));
231	if (!par->dc_regs)
232		return -ENOMEM;
233
234	ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
235	if (ret < 0)
236		return ret;
237
238	info->fix.smem_start = pci_resource_start(dev, 0);
239	info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
240	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
241	if (!info->screen_base)
242		return -ENOMEM;
243
244	/* Set the 16MiB aligned base address of the graphics memory region
245	 * in the display controller */
246
247	write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
248
249	dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
250		 info->fix.smem_len / 1024, info->fix.smem_start);
251
252	return 0;
253}
254
255static struct fb_ops gxfb_ops = {
256	.owner		= THIS_MODULE,
257	.fb_check_var	= gxfb_check_var,
258	.fb_set_par	= gxfb_set_par,
259	.fb_setcolreg	= gxfb_setcolreg,
260	.fb_blank       = gxfb_blank,
261	/* No HW acceleration for now. */
262	.fb_fillrect	= cfb_fillrect,
263	.fb_copyarea	= cfb_copyarea,
264	.fb_imageblit	= cfb_imageblit,
265};
266
267static struct fb_info * __init gxfb_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, "Geode GX");
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		= &gxfb_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	return info;
304}
305
306static int __init gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
307{
308	struct geodefb_par *par;
309	struct fb_info *info;
310	int ret;
311	unsigned long val;
312
313	info = gxfb_init_fbinfo(&pdev->dev);
314	if (!info)
315		return -ENOMEM;
316	par = info->par;
317
318	/* GX display controller and GX video device. */
319	par->dc_ops  = &gx_dc_ops;
320	par->vid_ops = &gx_vid_ops;
321
322	if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
323		dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
324		goto err;
325	}
326
327	/* Figure out if this is a TFT or CRT part */
328
329	rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
330
331	if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
332		par->enable_crt = 0;
333	else
334		par->enable_crt = 1;
335
336	ret = fb_find_mode(&info->var, info, mode_option,
337			   gx_modedb, ARRAY_SIZE(gx_modedb), NULL, 16);
338	if (ret == 0 || ret == 4) {
339		dev_err(&pdev->dev, "could not find valid video mode\n");
340		ret = -EINVAL;
341		goto err;
342	}
343
344
345	/* Clear the frame buffer of garbage. */
346        memset_io(info->screen_base, 0, info->fix.smem_len);
347
348	gxfb_check_var(&info->var, info);
349	gxfb_set_par(info);
350
351	if (register_framebuffer(info) < 0) {
352		ret = -EINVAL;
353		goto err;
354	}
355	pci_set_drvdata(pdev, info);
356	printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, 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, 3);
367	}
368	if (par->dc_regs) {
369		iounmap(par->dc_regs);
370		pci_release_region(pdev, 2);
371	}
372
373	if (info)
374		framebuffer_release(info);
375	return ret;
376}
377
378static void gxfb_remove(struct pci_dev *pdev)
379{
380	struct fb_info *info = pci_get_drvdata(pdev);
381	struct geodefb_par *par = info->par;
382
383	unregister_framebuffer(info);
384
385	iounmap((void __iomem *)info->screen_base);
386	pci_release_region(pdev, 0);
387
388	iounmap(par->vid_regs);
389	pci_release_region(pdev, 3);
390
391	iounmap(par->dc_regs);
392	pci_release_region(pdev, 2);
393
394	pci_set_drvdata(pdev, NULL);
395
396	framebuffer_release(info);
397}
398
399static struct pci_device_id gxfb_id_table[] = {
400	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
401	{ 0, }
402};
403
404MODULE_DEVICE_TABLE(pci, gxfb_id_table);
405
406static struct pci_driver gxfb_driver = {
407	.name		= "gxfb",
408	.id_table	= gxfb_id_table,
409	.probe		= gxfb_probe,
410	.remove		= gxfb_remove,
411};
412
413#ifndef MODULE
414static int __init gxfb_setup(char *options)
415{
416
417	char *opt;
418
419	if (!options || !*options)
420		return 0;
421
422	while ((opt = strsep(&options, ",")) != NULL) {
423		if (!*opt)
424			continue;
425
426		mode_option = opt;
427	}
428
429	return 0;
430}
431#endif
432
433static int __init gxfb_init(void)
434{
435#ifndef MODULE
436	char *option = NULL;
437
438	if (fb_get_options("gxfb", &option))
439		return -ENODEV;
440
441	gxfb_setup(option);
442#endif
443	return pci_register_driver(&gxfb_driver);
444}
445
446static void __exit gxfb_cleanup(void)
447{
448	pci_unregister_driver(&gxfb_driver);
449}
450
451module_init(gxfb_init);
452module_exit(gxfb_cleanup);
453
454module_param(mode_option, charp, 0);
455MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
456
457module_param(vram, int, 0);
458MODULE_PARM_DESC(vram, "video memory size");
459
460MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
461MODULE_LICENSE("GPL");
462