i2c: tegra: Add stub runtime power management
[linux-2.6.git] / drivers / video / sunxvr1000.c
1 /* sunxvr1000.c: Sun XVR-1000 driver for sparc64 systems
2  *
3  * Copyright (C) 2010 David S. Miller (davem@davemloft.net)
4  */
5
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/fb.h>
9 #include <linux/init.h>
10 #include <linux/of_device.h>
11
12 struct gfb_info {
13         struct fb_info          *info;
14
15         char __iomem            *fb_base;
16         unsigned long           fb_base_phys;
17
18         struct device_node      *of_node;
19
20         unsigned int            width;
21         unsigned int            height;
22         unsigned int            depth;
23         unsigned int            fb_size;
24
25         u32                     pseudo_palette[16];
26 };
27
28 static int __devinit gfb_get_props(struct gfb_info *gp)
29 {
30         gp->width = of_getintprop_default(gp->of_node, "width", 0);
31         gp->height = of_getintprop_default(gp->of_node, "height", 0);
32         gp->depth = of_getintprop_default(gp->of_node, "depth", 32);
33
34         if (!gp->width || !gp->height) {
35                 printk(KERN_ERR "gfb: Critical properties missing for %s\n",
36                        gp->of_node->full_name);
37                 return -EINVAL;
38         }
39
40         return 0;
41 }
42
43 static int gfb_setcolreg(unsigned regno,
44                          unsigned red, unsigned green, unsigned blue,
45                          unsigned transp, struct fb_info *info)
46 {
47         u32 value;
48
49         if (regno < 16) {
50                 red >>= 8;
51                 green >>= 8;
52                 blue >>= 8;
53
54                 value = (blue << 16) | (green << 8) | red;
55                 ((u32 *)info->pseudo_palette)[regno] = value;
56         }
57
58         return 0;
59 }
60
61 static struct fb_ops gfb_ops = {
62         .owner                  = THIS_MODULE,
63         .fb_setcolreg           = gfb_setcolreg,
64         .fb_fillrect            = cfb_fillrect,
65         .fb_copyarea            = cfb_copyarea,
66         .fb_imageblit           = cfb_imageblit,
67 };
68
69 static int __devinit 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->flags = FBINFO_DEFAULT;
75         info->fbops = &gfb_ops;
76         info->screen_base = gp->fb_base;
77         info->screen_size = gp->fb_size;
78
79         info->pseudo_palette = gp->pseudo_palette;
80
81         /* Fill fix common fields */
82         strlcpy(info->fix.id, "gfb", sizeof(info->fix.id));
83         info->fix.smem_start = gp->fb_base_phys;
84         info->fix.smem_len = gp->fb_size;
85         info->fix.type = FB_TYPE_PACKED_PIXELS;
86         if (gp->depth == 32 || gp->depth == 24)
87                 info->fix.visual = FB_VISUAL_TRUECOLOR;
88         else
89                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
90
91         var->xres = gp->width;
92         var->yres = gp->height;
93         var->xres_virtual = var->xres;
94         var->yres_virtual = var->yres;
95         var->bits_per_pixel = gp->depth;
96
97         var->red.offset = 0;
98         var->red.length = 8;
99         var->green.offset = 8;
100         var->green.length = 8;
101         var->blue.offset = 16;
102         var->blue.length = 8;
103         var->transp.offset = 0;
104         var->transp.length = 0;
105
106         if (fb_alloc_cmap(&info->cmap, 256, 0)) {
107                 printk(KERN_ERR "gfb: Cannot allocate color map.\n");
108                 return -ENOMEM;
109         }
110
111         return 0;
112 }
113
114 static int __devinit gfb_probe(struct platform_device *op)
115 {
116         struct device_node *dp = op->dev.of_node;
117         struct fb_info *info;
118         struct gfb_info *gp;
119         int err;
120
121         info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev);
122         if (!info) {
123                 printk(KERN_ERR "gfb: Cannot allocate fb_info\n");
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                 goto err_release_fb;
146
147         err = gfb_set_fbinfo(gp);
148         if (err)
149                 goto err_unmap_fb;
150
151         printk("gfb: Found device at %s\n", dp->full_name);
152
153         err = register_framebuffer(info);
154         if (err < 0) {
155                 printk(KERN_ERR "gfb: Could not register framebuffer %s\n",
156                        dp->full_name);
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 int __devexit gfb_remove(struct platform_device *op)
175 {
176         struct fb_info *info = dev_get_drvdata(&op->dev);
177         struct gfb_info *gp = info->par;
178
179         unregister_framebuffer(info);
180
181         iounmap(gp->fb_base);
182
183         of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
184
185         framebuffer_release(info);
186
187         dev_set_drvdata(&op->dev, NULL);
188
189         return 0;
190 }
191
192 static const struct of_device_id gfb_match[] = {
193         {
194                 .name = "SUNW,gfb",
195         },
196         {},
197 };
198 MODULE_DEVICE_TABLE(of, ffb_match);
199
200 static struct platform_driver gfb_driver = {
201         .probe          = gfb_probe,
202         .remove         = __devexit_p(gfb_remove),
203         .driver = {
204                 .name           = "gfb",
205                 .owner          = THIS_MODULE,
206                 .of_match_table = gfb_match,
207         },
208 };
209
210 static int __init gfb_init(void)
211 {
212         if (fb_get_options("gfb", NULL))
213                 return -ENODEV;
214
215         return platform_driver_register(&gfb_driver);
216 }
217
218 static void __exit gfb_exit(void)
219 {
220         platform_driver_unregister(&gfb_driver);
221 }
222
223 module_init(gfb_init);
224 module_exit(gfb_exit);
225
226 MODULE_DESCRIPTION("framebuffer driver for Sun XVR-1000 graphics");
227 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
228 MODULE_VERSION("1.0");
229 MODULE_LICENSE("GPL");