1 /* sunxvr1000.c: Sun XVR-1000 fb driver for sparc64 systems
2  *
3  * License: GPL
4  *
5  * Copyright (C) 2010 David S. Miller (davem@davemloft.net)
6  */
7 
8 #include <linux/kernel.h>
9 #include <linux/fb.h>
10 #include <linux/init.h>
11 #include <linux/of_device.h>
12 
13 struct gfb_info {
14 	struct fb_info		*info;
15 
16 	char __iomem		*fb_base;
17 	unsigned long		fb_base_phys;
18 
19 	struct device_node	*of_node;
20 
21 	unsigned int		width;
22 	unsigned int		height;
23 	unsigned int		depth;
24 	unsigned int		fb_size;
25 
26 	u32			pseudo_palette[16];
27 };
28 
gfb_get_props(struct gfb_info * gp)29 static int gfb_get_props(struct gfb_info *gp)
30 {
31 	gp->width = of_getintprop_default(gp->of_node, "width", 0);
32 	gp->height = of_getintprop_default(gp->of_node, "height", 0);
33 	gp->depth = of_getintprop_default(gp->of_node, "depth", 32);
34 
35 	if (!gp->width || !gp->height) {
36 		printk(KERN_ERR "gfb: Critical properties missing for %pOF\n",
37 		       gp->of_node);
38 		return -EINVAL;
39 	}
40 
41 	return 0;
42 }
43 
gfb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)44 static int gfb_setcolreg(unsigned regno,
45 			 unsigned red, unsigned green, unsigned blue,
46 			 unsigned transp, struct fb_info *info)
47 {
48 	u32 value;
49 
50 	if (regno < 16) {
51 		red >>= 8;
52 		green >>= 8;
53 		blue >>= 8;
54 
55 		value = (blue << 16) | (green << 8) | red;
56 		((u32 *)info->pseudo_palette)[regno] = value;
57 	}
58 
59 	return 0;
60 }
61 
62 static const struct fb_ops gfb_ops = {
63 	.owner			= THIS_MODULE,
64 	.fb_setcolreg		= gfb_setcolreg,
65 	.fb_fillrect		= cfb_fillrect,
66 	.fb_copyarea		= cfb_copyarea,
67 	.fb_imageblit		= cfb_imageblit,
68 };
69 
gfb_set_fbinfo(struct gfb_info * gp)70 static int gfb_set_fbinfo(struct gfb_info *gp)
71 {
72 	struct fb_info *info = gp->info;
73 	struct fb_var_screeninfo *var = &info->var;
74 
75 	info->flags = FBINFO_DEFAULT;
76 	info->fbops = &gfb_ops;
77 	info->screen_base = gp->fb_base;
78 	info->screen_size = gp->fb_size;
79 
80 	info->pseudo_palette = gp->pseudo_palette;
81 
82 	/* Fill fix common fields */
83 	strlcpy(info->fix.id, "gfb", sizeof(info->fix.id));
84         info->fix.smem_start = gp->fb_base_phys;
85         info->fix.smem_len = gp->fb_size;
86         info->fix.type = FB_TYPE_PACKED_PIXELS;
87 	if (gp->depth == 32 || gp->depth == 24)
88 		info->fix.visual = FB_VISUAL_TRUECOLOR;
89 	else
90 		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
91 
92 	var->xres = gp->width;
93 	var->yres = gp->height;
94 	var->xres_virtual = var->xres;
95 	var->yres_virtual = var->yres;
96 	var->bits_per_pixel = gp->depth;
97 
98 	var->red.offset = 0;
99 	var->red.length = 8;
100 	var->green.offset = 8;
101 	var->green.length = 8;
102 	var->blue.offset = 16;
103 	var->blue.length = 8;
104 	var->transp.offset = 0;
105 	var->transp.length = 0;
106 
107 	if (fb_alloc_cmap(&info->cmap, 256, 0)) {
108 		printk(KERN_ERR "gfb: Cannot allocate color map.\n");
109 		return -ENOMEM;
110 	}
111 
112         return 0;
113 }
114 
gfb_probe(struct platform_device * op)115 static int gfb_probe(struct platform_device *op)
116 {
117 	struct device_node *dp = op->dev.of_node;
118 	struct fb_info *info;
119 	struct gfb_info *gp;
120 	int err;
121 
122 	info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev);
123 	if (!info) {
124 		err = -ENOMEM;
125 		goto err_out;
126 	}
127 
128 	gp = info->par;
129 	gp->info = info;
130 	gp->of_node = dp;
131 
132 	gp->fb_base_phys = op->resource[6].start;
133 
134 	err = gfb_get_props(gp);
135 	if (err)
136 		goto err_release_fb;
137 
138 	/* Framebuffer length is the same regardless of resolution. */
139 	info->fix.line_length = 16384;
140 	gp->fb_size = info->fix.line_length * gp->height;
141 
142 	gp->fb_base = of_ioremap(&op->resource[6], 0,
143 				 gp->fb_size, "gfb fb");
144 	if (!gp->fb_base) {
145 		err = -ENOMEM;
146 		goto err_release_fb;
147 	}
148 
149 	err = gfb_set_fbinfo(gp);
150 	if (err)
151 		goto err_unmap_fb;
152 
153 	printk("gfb: Found device at %pOF\n", dp);
154 
155 	err = register_framebuffer(info);
156 	if (err < 0) {
157 		printk(KERN_ERR "gfb: Could not register framebuffer %pOF\n",
158 		       dp);
159 		goto err_unmap_fb;
160 	}
161 
162 	dev_set_drvdata(&op->dev, info);
163 
164 	return 0;
165 
166 err_unmap_fb:
167 	of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
168 
169 err_release_fb:
170         framebuffer_release(info);
171 
172 err_out:
173 	return err;
174 }
175 
176 static const struct of_device_id gfb_match[] = {
177 	{
178 		.name = "SUNW,gfb",
179 	},
180 	{},
181 };
182 
183 static struct platform_driver gfb_driver = {
184 	.probe		= gfb_probe,
185 	.driver = {
186 		.name			= "gfb",
187 		.of_match_table		= gfb_match,
188 		.suppress_bind_attrs	= true,
189 	},
190 };
191 
gfb_init(void)192 static int __init gfb_init(void)
193 {
194 	if (fb_get_options("gfb", NULL))
195 		return -ENODEV;
196 
197 	return platform_driver_register(&gfb_driver);
198 }
199 device_initcall(gfb_init);
200