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 __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
 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 __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
114static 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
164err_unmap_fb:
165	of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size);
166
167err_release_fb:
168        framebuffer_release(info);
169
170err_out:
171	return err;
172}
173
174static 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
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		= __devexit_p(gfb_remove),
203	.driver = {
204		.name		= "gfb",
205		.owner		= THIS_MODULE,
206		.of_match_table	= gfb_match,
207	},
208};
209
210static 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
218static void __exit gfb_exit(void)
219{
220	platform_driver_unregister(&gfb_driver);
221}
222
223module_init(gfb_init);
224module_exit(gfb_exit);
225
226MODULE_DESCRIPTION("framebuffer driver for Sun XVR-1000 graphics");
227MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
228MODULE_VERSION("1.0");
229MODULE_LICENSE("GPL");