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
12struct 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
28static int 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
43static 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
61static 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
69static 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->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
114static int 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		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 %s\n", dp->full_name);
154
155	err = register_framebuffer(info);
156	if (err < 0) {
157		printk(KERN_ERR "gfb: Could not register framebuffer %s\n",
158		       dp->full_name);
159		goto err_unmap_fb;
160	}
161
162	dev_set_drvdata(&op->dev, info);
163
164	return 0;
165
166err_unmap_fb:
167	of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
168
169err_release_fb:
170        framebuffer_release(info);
171
172err_out:
173	return err;
174}
175
176static int gfb_remove(struct platform_device *op)
177{
178	struct fb_info *info = dev_get_drvdata(&op->dev);
179	struct gfb_info *gp = info->par;
180
181	unregister_framebuffer(info);
182
183	iounmap(gp->fb_base);
184
185	of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
186
187        framebuffer_release(info);
188
189	return 0;
190}
191
192static const struct of_device_id gfb_match[] = {
193	{
194		.name = "SUNW,gfb",
195	},
196	{},
197};
198MODULE_DEVICE_TABLE(of, ffb_match);
199
200static struct platform_driver gfb_driver = {
201	.probe		= gfb_probe,
202	.remove		= gfb_remove,
203	.driver = {
204		.name		= "gfb",
205		.of_match_table	= gfb_match,
206	},
207};
208
209static int __init gfb_init(void)
210{
211	if (fb_get_options("gfb", NULL))
212		return -ENODEV;
213
214	return platform_driver_register(&gfb_driver);
215}
216
217static void __exit gfb_exit(void)
218{
219	platform_driver_unregister(&gfb_driver);
220}
221
222module_init(gfb_init);
223module_exit(gfb_exit);
224
225MODULE_DESCRIPTION("framebuffer driver for Sun XVR-1000 graphics");
226MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
227MODULE_VERSION("1.0");
228MODULE_LICENSE("GPL");
229