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