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