summaryrefslogtreecommitdiffstats
path: root/drivers/video/fbdev/sunxvr1000.c
blob: 490bd9a147638e6514cdc5fe23a8afacce2a5d3d (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
/* sunxvr1000.c: Sun XVR-1000 fb driver for sparc64 systems
 *
 * License: GPL
 *
 * Copyright (C) 2010 David S. Miller (davem@davemloft.net)
 */

#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/of_device.h>

struct gfb_info {
	struct fb_info		*info;

	char __iomem		*fb_base;
	unsigned long		fb_base_phys;

	struct device_node	*of_node;

	unsigned int		width;
	unsigned int		height;
	unsigned int		depth;
	unsigned int		fb_size;

	u32			pseudo_palette[16];
};

static int gfb_get_props(struct gfb_info *gp)
{
	gp->width = of_getintprop_default(gp->of_node, "width", 0);
	gp->height = of_getintprop_default(gp->of_node, "height", 0);
	gp->depth = of_getintprop_default(gp->of_node, "depth", 32);

	if (!gp->width || !gp->height) {
		printk(KERN_ERR "gfb: Critical properties missing for %pOF\n",
		       gp->of_node);
		return -EINVAL;
	}

	return 0;
}

static int gfb_setcolreg(unsigned regno,
			 unsigned red, unsigned green, unsigned blue,
			 unsigned transp, struct fb_info *info)
{
	u32 value;

	if (regno < 16) {
		red >>= 8;
		green >>= 8;
		blue >>= 8;

		value = (blue << 16) | (green << 8) | red;
		((u32 *)info->pseudo_palette)[regno] = value;
	}

	return 0;
}

static const struct fb_ops gfb_ops = {
	.owner			= THIS_MODULE,
	.fb_setcolreg		= gfb_setcolreg,
	.fb_fillrect		= cfb_fillrect,
	.fb_copyarea		= cfb_copyarea,
	.fb_imageblit		= cfb_imageblit,
};

static int gfb_set_fbinfo(struct gfb_info *gp)
{
	struct fb_info *info = gp->info;
	struct fb_var_screeninfo *var = &info->var;

	info->flags = FBINFO_DEFAULT;
	info->fbops = &gfb_ops;
	info->screen_base = gp->fb_base;
	info->screen_size = gp->fb_size;

	info->pseudo_palette = gp->pseudo_palette;

	/* Fill fix common fields */
	strscpy(info->fix.id, "gfb", sizeof(info->fix.id));
        info->fix.smem_start = gp->fb_base_phys;
        info->fix.smem_len = gp->fb_size;
        info->fix.type = FB_TYPE_PACKED_PIXELS;
	if (gp->depth == 32 || gp->depth == 24)
		info->fix.visual = FB_VISUAL_TRUECOLOR;
	else
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

	var->xres = gp->width;
	var->yres = gp->height;
	var->xres_virtual = var->xres;
	var->yres_virtual = var->yres;
	var->bits_per_pixel = gp->depth;

	var->red.offset = 0;
	var->red.length = 8;
	var->green.offset = 8;
	var->green.length = 8;
	var->blue.offset = 16;
	var->blue.length = 8;
	var->transp.offset = 0;
	var->transp.length = 0;

	if (fb_alloc_cmap(&info->cmap, 256, 0)) {
		printk(KERN_ERR "gfb: Cannot allocate color map.\n");
		return -ENOMEM;
	}

        return 0;
}

static int gfb_probe(struct platform_device *op)
{
	struct device_node *dp = op->dev.of_node;
	struct fb_info *info;
	struct gfb_info *gp;
	int err;

	info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev);
	if (!info) {
		err = -ENOMEM;
		goto err_out;
	}

	gp = info->par;
	gp->info = info;
	gp->of_node = dp;

	gp->fb_base_phys = op->resource[6].start;

	err = gfb_get_props(gp);
	if (err)
		goto err_release_fb;

	/* Framebuffer length is the same regardless of resolution. */
	info->fix.line_length = 16384;
	gp->fb_size = info->fix.line_length * gp->height;

	gp->fb_base = of_ioremap(&op->resource[6], 0,
				 gp->fb_size, "gfb fb");
	if (!gp->fb_base) {
		err = -ENOMEM;
		goto err_release_fb;
	}

	err = gfb_set_fbinfo(gp);
	if (err)
		goto err_unmap_fb;

	printk("gfb: Found device at %pOF\n", dp);

	err = register_framebuffer(info);
	if (err < 0) {
		printk(KERN_ERR "gfb: Could not register framebuffer %pOF\n",
		       dp);
		goto err_unmap_fb;
	}

	dev_set_drvdata(&op->dev, info);

	return 0;

err_unmap_fb:
	of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);

err_release_fb:
        framebuffer_release(info);

err_out:
	return err;
}

static const struct of_device_id gfb_match[] = {
	{
		.name = "SUNW,gfb",
	},
	{},
};

static struct platform_driver gfb_driver = {
	.probe		= gfb_probe,
	.driver = {
		.name			= "gfb",
		.of_match_table		= gfb_match,
		.suppress_bind_attrs	= true,
	},
};

static int __init gfb_init(void)
{
	if (fb_get_options("gfb", NULL))
		return -ENODEV;

	return platform_driver_register(&gfb_driver);
}
device_initcall(gfb_init);