summaryrefslogtreecommitdiff
path: root/drivers/video/geode/gx1fb_core.c
blob: 83830d24bcdaa352ea7cb98570a48dfd47a12e3f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/*
 * drivers/video/geode/gx1fb_core.c
 *   -- Geode GX1 framebuffer driver
 *
 * Copyright (C) 2005 Arcom Control Systems Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>

#include "geodefb.h"
#include "display_gx1.h"
#include "video_cs5530.h"

static char mode_option[32] = "640x480-16@60";
static int  crt_option = 1;
static char panel_option[32] = "";

static int gx1_line_delta(int xres, int bpp)
{
	int line_delta = xres * (bpp >> 3);

	if (line_delta > 2048)
		line_delta = 4096;
	else if (line_delta > 1024)
		line_delta = 2048;
	else
		line_delta = 1024;
	return line_delta;
}

static int gx1fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	struct geodefb_par *par = info->par;

	printk(KERN_DEBUG "%s()\n", __FUNCTION__);

	/* Maximum resolution is 1280x1024. */
	if (var->xres > 1280 || var->yres > 1024)
		return -EINVAL;

	if (par->panel_x && (var->xres > par->panel_x || var->yres > par->panel_y))
		return -EINVAL;

	/* Only 16 bpp and 8 bpp is supported by the hardware. */
	if (var->bits_per_pixel == 16) {
		var->red.offset   = 11; var->red.length   = 5;
		var->green.offset =  5; var->green.length = 6;
		var->blue.offset  =  0; var->blue.length  = 5;
		var->transp.offset = 0; var->transp.length = 0;
	} else if (var->bits_per_pixel == 8) {
		var->red.offset   = 0; var->red.length   = 8;
		var->green.offset = 0; var->green.length = 8;
		var->blue.offset  = 0; var->blue.length  = 8;
		var->transp.offset = 0; var->transp.length = 0;
	} else
		return -EINVAL;

	/* Enough video memory? */
	if (gx1_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
		return -EINVAL;

	/* FIXME: Check timing parameters here? */

	return 0;
}

static int gx1fb_set_par(struct fb_info *info)
{
	struct geodefb_par *par = info->par;

	if (info->var.bits_per_pixel == 16) {
		info->fix.visual = FB_VISUAL_TRUECOLOR;
		fb_dealloc_cmap(&info->cmap);
	} else {
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
	}

	info->fix.line_length = gx1_line_delta(info->var.xres, info->var.bits_per_pixel);

	par->dc_ops->set_mode(info);

	return 0;
}

static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
{
	chan &= 0xffff;
	chan >>= 16 - bf->length;
	return chan << bf->offset;
}

static int gx1fb_setcolreg(unsigned regno, unsigned red, unsigned green,
			   unsigned blue, unsigned transp,
			   struct fb_info *info)
{
	struct geodefb_par *par = info->par;

	if (info->var.grayscale) {
		/* grayscale = 0.30*R + 0.59*G + 0.11*B */
		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
	}

	/* Truecolor has hardware independent palette */
	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
		u32 *pal = info->pseudo_palette;
		u32 v;

		if (regno >= 16)
			return -EINVAL;

		v  = chan_to_field(red, &info->var.red);
		v |= chan_to_field(green, &info->var.green);
		v |= chan_to_field(blue, &info->var.blue);

		pal[regno] = v;
	} else {
		if (regno >= 256)
			return -EINVAL;

		par->dc_ops->set_palette_reg(info, regno, red, green, blue);
	}

	return 0;
}

static int gx1fb_blank(int blank_mode, struct fb_info *info)
{
	struct geodefb_par *par = info->par;

	return par->vid_ops->blank_display(info, blank_mode);
}

static int __init gx1fb_map_video_memory(struct fb_info *info)
{
	struct geodefb_par *par = info->par;
	unsigned gx_base;
	int fb_len;

	gx_base = gx1_gx_base();
	if (!gx_base)
		return -ENODEV;

	par->vid_dev = pci_get_device(PCI_VENDOR_ID_CYRIX,
				      PCI_DEVICE_ID_CYRIX_5530_VIDEO, NULL);
	if (!par->vid_dev)
		return -ENODEV;

	par->vid_regs = ioremap(pci_resource_start(par->vid_dev, 1),
				pci_resource_len(par->vid_dev, 1));
	if (!par->vid_regs)
		return -ENOMEM;

	par->dc_regs = ioremap(gx_base + 0x8300, 0x100);
	if (!par->dc_regs)
		return -ENOMEM;

	info->fix.smem_start = gx_base + 0x800000;
	if ((fb_len = gx1_frame_buffer_size()) < 0)
		return -ENOMEM;
	info->fix.smem_len = fb_len;
	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
	if (!info->screen_base)
		return -ENOMEM;

	printk(KERN_INFO "%s: %d Kibyte of video memory at 0x%lx\n",
	       info->fix.id, info->fix.smem_len / 1024, info->fix.smem_start);

	return 0;
}

static int parse_panel_option(struct fb_info *info)
{
	struct geodefb_par *par = info->par;

	if (strcmp(panel_option, "") != 0) {
		int x, y;
		char *s;
		x = simple_strtol(panel_option, &s, 10);
		if (!x)
			return -EINVAL;
		y = simple_strtol(s + 1, NULL, 10);
		if (!y)
			return -EINVAL;
		par->panel_x = x;
		par->panel_y = y;
	}
	return 0;
}

static struct fb_ops gx1fb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= gx1fb_check_var,
	.fb_set_par	= gx1fb_set_par,
	.fb_setcolreg	= gx1fb_setcolreg,
	.fb_blank       = gx1fb_blank,
	/* No HW acceleration for now. */
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_cursor	= soft_cursor,
};

static struct fb_info * __init gx1fb_init_fbinfo(void)
{
	struct fb_info *info;
	struct geodefb_par *par;

	/* Alloc enough space for the pseudo palette. */
	info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, NULL);
	if (!info)
		return NULL;

	par = info->par;

	strcpy(info->fix.id, "GX1");

	info->fix.type		= FB_TYPE_PACKED_PIXELS;
	info->fix.type_aux	= 0;
	info->fix.xpanstep	= 0;
	info->fix.ypanstep	= 0;
	info->fix.ywrapstep	= 0;
	info->fix.accel		= FB_ACCEL_NONE;

	info->var.nonstd	= 0;
	info->var.activate	= FB_ACTIVATE_NOW;
	info->var.height	= -1;
	info->var.width	= -1;
	info->var.accel_flags = 0;
	info->var.vmode	= FB_VMODE_NONINTERLACED;

	info->fbops		= &gx1fb_ops;
	info->flags		= FBINFO_DEFAULT;
	info->node		= -1;

	info->pseudo_palette	= (void *)par + sizeof(struct geodefb_par);

	info->var.grayscale	= 0;

	/* CRT and panel options */
	par->enable_crt = crt_option;
	if (parse_panel_option(info) < 0)
		printk(KERN_WARNING "%s: invalid 'panel' option -- disabling flat panel\n",
		       info->fix.id);
	if (!par->panel_x)
		par->enable_crt = 1; /* fall back to CRT if no panel is specified */

	return info;
}


static struct fb_info *gx1fb_info;

static int __init gx1fb_init(void)
{
	struct fb_info *info;
        struct geodefb_par *par;
	int ret;

#ifndef MODULE
	if (fb_get_options("gx1fb", NULL))
		return -ENODEV;
#endif

	info = gx1fb_init_fbinfo();
	if (!info)
		return -ENOMEM;
	gx1fb_info = info;

	par = info->par;

	/* GX1 display controller and CS5530 video device */
	par->dc_ops  = &gx1_dc_ops;
	par->vid_ops = &cs5530_vid_ops;

	if ((ret = gx1fb_map_video_memory(info)) < 0) {
		printk(KERN_ERR "%s: gx1fb_map_video_memory() failed\n", info->fix.id);
		goto err;
	}

	ret = fb_find_mode(&info->var, info, mode_option, NULL, 0, NULL, 16);
	if (ret == 0 || ret == 4) {
		printk(KERN_ERR "%s: could not find valid video mode\n", info->fix.id);
		ret = -EINVAL;
		goto err;
	}

        /* Clear the frame buffer of garbage. */
        memset_io(info->screen_base, 0, info->fix.smem_len);

	gx1fb_check_var(&info->var, info);
	gx1fb_set_par(info);

	if (register_framebuffer(info) < 0) {
		ret = -EINVAL;
		goto err;
	}
	printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
	return 0;

  err:
	if (info->screen_base)
		iounmap(info->screen_base);
	if (par->vid_regs)
		iounmap(par->vid_regs);
	if (par->dc_regs)
		iounmap(par->dc_regs);
	if (par->vid_dev)
		pci_dev_put(par->vid_dev);
	if (info)
		framebuffer_release(info);
	return ret;
}

static void __exit gx1fb_cleanup(void)
{
	struct fb_info *info = gx1fb_info;
	struct geodefb_par *par = gx1fb_info->par;

	unregister_framebuffer(info);

	iounmap((void __iomem *)info->screen_base);
	iounmap(par->vid_regs);
	iounmap(par->dc_regs);

	pci_dev_put(par->vid_dev);

	framebuffer_release(info);
}

module_init(gx1fb_init);
module_exit(gx1fb_cleanup);

module_param_string(mode, mode_option, sizeof(mode_option), 0444);
MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");

module_param_named(crt, crt_option, int, 0444);
MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)");

module_param_string(panel, panel_option, sizeof(panel_option), 0444);
MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)");

MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1");
MODULE_LICENSE("GPL");