xref: /openbmc/linux/drivers/video/fbdev/sunxvr1000.c (revision 6236402b)
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.h>
12 #include <linux/platform_device.h>
13 
14 struct gfb_info {
15 	struct fb_info		*info;
16 
17 	char __iomem		*fb_base;
18 	unsigned long		fb_base_phys;
19 
20 	struct device_node	*of_node;
21 
22 	unsigned int		width;
23 	unsigned int		height;
24 	unsigned int		depth;
25 	unsigned int		fb_size;
26 
27 	u32			pseudo_palette[16];
28 };
29 
gfb_get_props(struct gfb_info * gp)30 static int gfb_get_props(struct gfb_info *gp)
31 {
32 	gp->width = of_getintprop_default(gp->of_node, "width", 0);
33 	gp->height = of_getintprop_default(gp->of_node, "height", 0);
34 	gp->depth = of_getintprop_default(gp->of_node, "depth", 32);
35 
36 	if (!gp->width || !gp->height) {
37 		printk(KERN_ERR "gfb: Critical properties missing for %pOF\n",
38 		       gp->of_node);
39 		return -EINVAL;
40 	}
41 
42 	return 0;
43 }
44 
gfb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)45 static int gfb_setcolreg(unsigned regno,
46 			 unsigned red, unsigned green, unsigned blue,
47 			 unsigned transp, struct fb_info *info)
48 {
49 	u32 value;
50 
51 	if (regno < 16) {
52 		red >>= 8;
53 		green >>= 8;
54 		blue >>= 8;
55 
56 		value = (blue << 16) | (green << 8) | red;
57 		((u32 *)info->pseudo_palette)[regno] = value;
58 	}
59 
60 	return 0;
61 }
62 
63 static const struct fb_ops gfb_ops = {
64 	.owner			= THIS_MODULE,
65 	FB_DEFAULT_IOMEM_OPS,
66 	.fb_setcolreg		= gfb_setcolreg,
67 };
68 
gfb_set_fbinfo(struct gfb_info * gp)69 static int gfb_set_fbinfo(struct gfb_info *gp)
70 {
71 	struct fb_info *info = gp->info;
72 	struct fb_var_screeninfo *var = &info->var;
73 
74 	info->fbops = &gfb_ops;
75 	info->screen_base = gp->fb_base;
76 	info->screen_size = gp->fb_size;
77 
78 	info->pseudo_palette = gp->pseudo_palette;
79 
80 	/* Fill fix common fields */
81 	strscpy(info->fix.id, "gfb", sizeof(info->fix.id));
82         info->fix.smem_start = gp->fb_base_phys;
83         info->fix.smem_len = gp->fb_size;
84         info->fix.type = FB_TYPE_PACKED_PIXELS;
85 	if (gp->depth == 32 || gp->depth == 24)
86 		info->fix.visual = FB_VISUAL_TRUECOLOR;
87 	else
88 		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
89 
90 	var->xres = gp->width;
91 	var->yres = gp->height;
92 	var->xres_virtual = var->xres;
93 	var->yres_virtual = var->yres;
94 	var->bits_per_pixel = gp->depth;
95 
96 	var->red.offset = 0;
97 	var->red.length = 8;
98 	var->green.offset = 8;
99 	var->green.length = 8;
100 	var->blue.offset = 16;
101 	var->blue.length = 8;
102 	var->transp.offset = 0;
103 	var->transp.length = 0;
104 
105 	if (fb_alloc_cmap(&info->cmap, 256, 0)) {
106 		printk(KERN_ERR "gfb: Cannot allocate color map.\n");
107 		return -ENOMEM;
108 	}
109 
110         return 0;
111 }
112 
gfb_probe(struct platform_device * op)113 static int gfb_probe(struct platform_device *op)
114 {
115 	struct device_node *dp = op->dev.of_node;
116 	struct fb_info *info;
117 	struct gfb_info *gp;
118 	int err;
119 
120 	info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev);
121 	if (!info) {
122 		err = -ENOMEM;
123 		goto err_out;
124 	}
125 
126 	gp = info->par;
127 	gp->info = info;
128 	gp->of_node = dp;
129 
130 	gp->fb_base_phys = op->resource[6].start;
131 
132 	err = gfb_get_props(gp);
133 	if (err)
134 		goto err_release_fb;
135 
136 	/* Framebuffer length is the same regardless of resolution. */
137 	info->fix.line_length = 16384;
138 	gp->fb_size = info->fix.line_length * gp->height;
139 
140 	gp->fb_base = of_ioremap(&op->resource[6], 0,
141 				 gp->fb_size, "gfb fb");
142 	if (!gp->fb_base) {
143 		err = -ENOMEM;
144 		goto err_release_fb;
145 	}
146 
147 	err = gfb_set_fbinfo(gp);
148 	if (err)
149 		goto err_unmap_fb;
150 
151 	printk("gfb: Found device at %pOF\n", dp);
152 
153 	err = register_framebuffer(info);
154 	if (err < 0) {
155 		printk(KERN_ERR "gfb: Could not register framebuffer %pOF\n",
156 		       dp);
157 		goto err_unmap_fb;
158 	}
159 
160 	dev_set_drvdata(&op->dev, info);
161 
162 	return 0;
163 
164 err_unmap_fb:
165 	of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
166 
167 err_release_fb:
168         framebuffer_release(info);
169 
170 err_out:
171 	return err;
172 }
173 
174 static const struct of_device_id gfb_match[] = {
175 	{
176 		.name = "SUNW,gfb",
177 	},
178 	{},
179 };
180 
181 static struct platform_driver gfb_driver = {
182 	.probe		= gfb_probe,
183 	.driver = {
184 		.name			= "gfb",
185 		.of_match_table		= gfb_match,
186 		.suppress_bind_attrs	= true,
187 	},
188 };
189 
gfb_init(void)190 static int __init gfb_init(void)
191 {
192 	if (fb_get_options("gfb", NULL))
193 		return -ENODEV;
194 
195 	return platform_driver_register(&gfb_driver);
196 }
197 device_initcall(gfb_init);
198