1 /* 2 * linux/drivers/video/q40fb.c -- Q40 frame buffer device 3 * 4 * Copyright (C) 2001 5 * 6 * Richard Zidlicky <rz@linux-m68k.org> 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file COPYING in the main directory of this archive for 10 * more details. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/errno.h> 15 #include <linux/string.h> 16 #include <linux/mm.h> 17 #include <linux/delay.h> 18 #include <linux/interrupt.h> 19 #include <linux/platform_device.h> 20 21 #include <linux/uaccess.h> 22 #include <asm/setup.h> 23 #include <asm/q40_master.h> 24 #include <linux/fb.h> 25 #include <linux/module.h> 26 27 #define Q40_PHYS_SCREEN_ADDR 0xFE800000 28 29 static struct fb_fix_screeninfo q40fb_fix = { 30 .id = "Q40", 31 .smem_len = 1024*1024, 32 .type = FB_TYPE_PACKED_PIXELS, 33 .visual = FB_VISUAL_TRUECOLOR, 34 .line_length = 1024*2, 35 .accel = FB_ACCEL_NONE, 36 }; 37 38 static const struct fb_var_screeninfo q40fb_var = { 39 .xres = 1024, 40 .yres = 512, 41 .xres_virtual = 1024, 42 .yres_virtual = 512, 43 .bits_per_pixel = 16, 44 .red = {6, 5, 0}, 45 .green = {11, 5, 0}, 46 .blue = {0, 6, 0}, 47 .activate = FB_ACTIVATE_NOW, 48 .height = 230, 49 .width = 300, 50 .vmode = FB_VMODE_NONINTERLACED, 51 }; 52 53 static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green, 54 unsigned blue, unsigned transp, 55 struct fb_info *info) 56 { 57 /* 58 * Set a single color register. The values supplied have a 16 bit 59 * magnitude. 60 * Return != 0 for invalid regno. 61 */ 62 63 if (regno > 255) 64 return 1; 65 red>>=11; 66 green>>=11; 67 blue>>=10; 68 69 if (regno < 16) { 70 ((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) | 71 ((green & 31) << 11) | 72 (blue & 63); 73 } 74 return 0; 75 } 76 77 static const struct fb_ops q40fb_ops = { 78 .owner = THIS_MODULE, 79 FB_DEFAULT_IOMEM_OPS, 80 .fb_setcolreg = q40fb_setcolreg, 81 }; 82 83 static int q40fb_probe(struct platform_device *dev) 84 { 85 struct fb_info *info; 86 87 if (!MACH_IS_Q40) 88 return -ENXIO; 89 90 /* mapped in q40/config.c */ 91 q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR; 92 93 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev); 94 if (!info) 95 return -ENOMEM; 96 97 info->var = q40fb_var; 98 info->fix = q40fb_fix; 99 info->fbops = &q40fb_ops; 100 info->pseudo_palette = info->par; 101 info->par = NULL; 102 info->screen_base = (char *) q40fb_fix.smem_start; 103 104 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 105 framebuffer_release(info); 106 return -ENOMEM; 107 } 108 109 master_outb(3, DISPLAY_CONTROL_REG); 110 111 if (register_framebuffer(info) < 0) { 112 printk(KERN_ERR "Unable to register Q40 frame buffer\n"); 113 fb_dealloc_cmap(&info->cmap); 114 framebuffer_release(info); 115 return -EINVAL; 116 } 117 118 fb_info(info, "Q40 frame buffer alive and kicking !\n"); 119 return 0; 120 } 121 122 static struct platform_driver q40fb_driver = { 123 .probe = q40fb_probe, 124 .driver = { 125 .name = "q40fb", 126 }, 127 }; 128 129 static struct platform_device q40fb_device = { 130 .name = "q40fb", 131 }; 132 133 static int __init q40fb_init(void) 134 { 135 int ret = 0; 136 137 if (fb_get_options("q40fb", NULL)) 138 return -ENODEV; 139 140 ret = platform_driver_register(&q40fb_driver); 141 142 if (!ret) { 143 ret = platform_device_register(&q40fb_device); 144 if (ret) 145 platform_driver_unregister(&q40fb_driver); 146 } 147 return ret; 148 } 149 150 module_init(q40fb_init); 151 MODULE_LICENSE("GPL"); 152