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 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 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_DEFAULT_IOMEM_OPS, 65 .fb_setcolreg = gfb_setcolreg, 66 }; 67 68 static int gfb_set_fbinfo(struct gfb_info *gp) 69 { 70 struct fb_info *info = gp->info; 71 struct fb_var_screeninfo *var = &info->var; 72 73 info->fbops = &gfb_ops; 74 info->screen_base = gp->fb_base; 75 info->screen_size = gp->fb_size; 76 77 info->pseudo_palette = gp->pseudo_palette; 78 79 /* Fill fix common fields */ 80 strscpy(info->fix.id, "gfb", sizeof(info->fix.id)); 81 info->fix.smem_start = gp->fb_base_phys; 82 info->fix.smem_len = gp->fb_size; 83 info->fix.type = FB_TYPE_PACKED_PIXELS; 84 if (gp->depth == 32 || gp->depth == 24) 85 info->fix.visual = FB_VISUAL_TRUECOLOR; 86 else 87 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 88 89 var->xres = gp->width; 90 var->yres = gp->height; 91 var->xres_virtual = var->xres; 92 var->yres_virtual = var->yres; 93 var->bits_per_pixel = gp->depth; 94 95 var->red.offset = 0; 96 var->red.length = 8; 97 var->green.offset = 8; 98 var->green.length = 8; 99 var->blue.offset = 16; 100 var->blue.length = 8; 101 var->transp.offset = 0; 102 var->transp.length = 0; 103 104 if (fb_alloc_cmap(&info->cmap, 256, 0)) { 105 printk(KERN_ERR "gfb: Cannot allocate color map.\n"); 106 return -ENOMEM; 107 } 108 109 return 0; 110 } 111 112 static int gfb_probe(struct platform_device *op) 113 { 114 struct device_node *dp = op->dev.of_node; 115 struct fb_info *info; 116 struct gfb_info *gp; 117 int err; 118 119 info = framebuffer_alloc(sizeof(struct gfb_info), &op->dev); 120 if (!info) { 121 err = -ENOMEM; 122 goto err_out; 123 } 124 125 gp = info->par; 126 gp->info = info; 127 gp->of_node = dp; 128 129 gp->fb_base_phys = op->resource[6].start; 130 131 err = gfb_get_props(gp); 132 if (err) 133 goto err_release_fb; 134 135 /* Framebuffer length is the same regardless of resolution. */ 136 info->fix.line_length = 16384; 137 gp->fb_size = info->fix.line_length * gp->height; 138 139 gp->fb_base = of_ioremap(&op->resource[6], 0, 140 gp->fb_size, "gfb fb"); 141 if (!gp->fb_base) { 142 err = -ENOMEM; 143 goto err_release_fb; 144 } 145 146 err = gfb_set_fbinfo(gp); 147 if (err) 148 goto err_unmap_fb; 149 150 printk("gfb: Found device at %pOF\n", dp); 151 152 err = register_framebuffer(info); 153 if (err < 0) { 154 printk(KERN_ERR "gfb: Could not register framebuffer %pOF\n", 155 dp); 156 goto err_unmap_fb; 157 } 158 159 dev_set_drvdata(&op->dev, info); 160 161 return 0; 162 163 err_unmap_fb: 164 of_iounmap(&op->resource[6], gp->fb_base, gp->fb_size); 165 166 err_release_fb: 167 framebuffer_release(info); 168 169 err_out: 170 return err; 171 } 172 173 static const struct of_device_id gfb_match[] = { 174 { 175 .name = "SUNW,gfb", 176 }, 177 {}, 178 }; 179 180 static struct platform_driver gfb_driver = { 181 .probe = gfb_probe, 182 .driver = { 183 .name = "gfb", 184 .of_match_table = gfb_match, 185 .suppress_bind_attrs = true, 186 }, 187 }; 188 189 static int __init gfb_init(void) 190 { 191 if (fb_get_options("gfb", NULL)) 192 return -ENODEV; 193 194 return platform_driver_register(&gfb_driver); 195 } 196 device_initcall(gfb_init); 197