sunxvr1000.c

  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.h>
 12#include <linux/platform_device.h>
 13
 14struct gfb_info {
 15	struct fb_info		*info;
 16
 17	char __iomem		*fb_base;
 18	unsigned long		fb_base_phys;
 19
 20	struct device_node	*of_node;
 21
 22	unsigned int		width;
 23	unsigned int		height;
 24	unsigned int		depth;
 25	unsigned int		fb_size;
 26
 27	u32			pseudo_palette[16];
 28};
 29
 30static int gfb_get_props(struct gfb_info *gp)
 31{
 32	gp->width = of_getintprop_default(gp->of_node, "width", 0);
 33	gp->height = of_getintprop_default(gp->of_node, "height", 0);
 34	gp->depth = of_getintprop_default(gp->of_node, "depth", 32);
 35
 36	if (!gp->width || !gp->height) {
 37		printk(KERN_ERR "gfb: Critical properties missing for %pOF\n",
 38		       gp->of_node);
 39		return -EINVAL;
 40	}
 41
 42	return 0;
 43}
 44
 45static int gfb_setcolreg(unsigned regno,
 46			 unsigned red, unsigned green, unsigned blue,
 47			 unsigned transp, struct fb_info *info)
 48{
 49	u32 value;
 50
 51	if (regno < 16) {
 52		red >>= 8;
 53		green >>= 8;
 54		blue >>= 8;
 55
 56		value = (blue << 16) | (green << 8) | red;
 57		((u32 *)info->pseudo_palette)[regno] = value;
 58	}
 59
 60	return 0;
 61}
 62
 63static const struct fb_ops gfb_ops = {
 64	.owner			= THIS_MODULE,
 65	FB_DEFAULT_IOMEM_OPS,
 66	.fb_setcolreg		= gfb_setcolreg,
 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->fbops = &gfb_ops;
 75	info->screen_base = gp->fb_base;
 76	info->screen_size = gp->fb_size;
 77
 78	info->pseudo_palette = gp->pseudo_palette;
 79
 80	/* Fill fix common fields */
 81	strscpy(info->fix.id, "gfb", sizeof(info->fix.id));
 82        info->fix.smem_start = gp->fb_base_phys;
 83        info->fix.smem_len = gp->fb_size;
 84        info->fix.type = FB_TYPE_PACKED_PIXELS;
 85	if (gp->depth == 32 || gp->depth == 24)
 86		info->fix.visual = FB_VISUAL_TRUECOLOR;
 87	else
 88		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 89
 90	var->xres = gp->width;
 91	var->yres = gp->height;
 92	var->xres_virtual = var->xres;
 93	var->yres_virtual = var->yres;
 94	var->bits_per_pixel = gp->depth;
 95
 96	var->red.offset = 0;
 97	var->red.length = 8;
 98	var->green.offset = 8;
 99	var->green.length = 8;
100	var->blue.offset = 16;
101	var->blue.length = 8;
102	var->transp.offset = 0;
103	var->transp.length = 0;
104
105	if (fb_alloc_cmap(&info->cmap, 256, 0)) {
106		printk(KERN_ERR "gfb: Cannot allocate color map.\n");
107		return -ENOMEM;
108	}
109
110        return 0;
111}
112
113static int gfb_probe(struct platform_device *op)
114{
115	struct device_node *dp = op->dev.of_node;
116	struct fb_info *info;
117	struct gfb_info *gp;
118	int err;
119
120	info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev);
121	if (!info) {
122		err = -ENOMEM;
123		goto err_out;
124	}
125
126	gp = info->par;
127	gp->info = info;
128	gp->of_node = dp;
129
130	gp->fb_base_phys = op->resource[6].start;
131
132	err = gfb_get_props(gp);
133	if (err)
134		goto err_release_fb;
135
136	/* Framebuffer length is the same regardless of resolution. */
137	info->fix.line_length = 16384;
138	gp->fb_size = info->fix.line_length * gp->height;
139
140	gp->fb_base = of_ioremap(&op->resource[6], 0,
141				 gp->fb_size, "gfb fb");
142	if (!gp->fb_base) {
143		err = -ENOMEM;
144		goto err_release_fb;
145	}
146
147	err = gfb_set_fbinfo(gp);
148	if (err)
149		goto err_unmap_fb;
150
151	printk("gfb: Found device at %pOF\n", dp);
152
153	err = register_framebuffer(info);
154	if (err < 0) {
155		printk(KERN_ERR "gfb: Could not register framebuffer %pOF\n",
156		       dp);
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 const struct of_device_id gfb_match[] = {
175	{
176		.name = "SUNW,gfb",
177	},
178	{},
179};
180
181static struct platform_driver gfb_driver = {
182	.probe		= gfb_probe,
183	.driver = {
184		.name			= "gfb",
185		.of_match_table		= gfb_match,
186		.suppress_bind_attrs	= true,
187	},
188};
189
190static int __init gfb_init(void)
191{
192	if (fb_get_options("gfb", NULL))
193		return -ENODEV;
194
195	return platform_driver_register(&gfb_driver);
196}
197device_initcall(gfb_init);