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
13struct 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
29static 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
44static 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
62static 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
70static 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
115static 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
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 const struct of_device_id gfb_match[] = {
177	{
178		.name = "SUNW,gfb",
179	},
180	{},
181};
182
183static 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
192static 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}
199device_initcall(gfb_init);
200