1 /* 2 * linux/drivers/video/pmag-ba-fb.c 3 * 4 * PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support, 5 * derived from: 6 * "HP300 Topcat framebuffer support (derived from macfb of all things) 7 * Phil Blundell <philb@gnu.org> 1998", the original code can be 8 * found in the file hpfb.c in the same directory. 9 * 10 * Based on digital document: 11 * "PMAG-BA TURBOchannel Color Frame Buffer 12 * Functional Specification", Revision 1.2, August 27, 1990 13 * 14 * DECstation related code Copyright (C) 1999, 2000, 2001 by 15 * Michael Engel <engel@unix-ag.org>, 16 * Karsten Merker <merker@linuxtag.org> and 17 * Harald Koerfgen. 18 * Copyright (c) 2005, 2006 Maciej W. Rozycki 19 * Copyright (c) 2005 James Simmons 20 * 21 * This file is subject to the terms and conditions of the GNU General 22 * Public License. See the file COPYING in the main directory of this 23 * archive for more details. 24 */ 25 26 #include <linux/compiler.h> 27 #include <linux/errno.h> 28 #include <linux/fb.h> 29 #include <linux/init.h> 30 #include <linux/kernel.h> 31 #include <linux/module.h> 32 #include <linux/tc.h> 33 #include <linux/types.h> 34 35 #include <asm/io.h> 36 37 #include <video/pmag-ba-fb.h> 38 39 40 struct pmagbafb_par { 41 volatile void __iomem *mmio; 42 volatile u32 __iomem *dac; 43 }; 44 45 46 static const struct fb_var_screeninfo pmagbafb_defined = { 47 .xres = 1024, 48 .yres = 864, 49 .xres_virtual = 1024, 50 .yres_virtual = 864, 51 .bits_per_pixel = 8, 52 .red.length = 8, 53 .green.length = 8, 54 .blue.length = 8, 55 .activate = FB_ACTIVATE_NOW, 56 .height = -1, 57 .width = -1, 58 .accel_flags = FB_ACCEL_NONE, 59 .pixclock = 14452, 60 .left_margin = 116, 61 .right_margin = 12, 62 .upper_margin = 34, 63 .lower_margin = 0, 64 .hsync_len = 128, 65 .vsync_len = 3, 66 .sync = FB_SYNC_ON_GREEN, 67 .vmode = FB_VMODE_NONINTERLACED, 68 }; 69 70 static const struct fb_fix_screeninfo pmagbafb_fix = { 71 .id = "PMAG-BA", 72 .smem_len = (1024 * 1024), 73 .type = FB_TYPE_PACKED_PIXELS, 74 .visual = FB_VISUAL_PSEUDOCOLOR, 75 .line_length = 1024, 76 .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459, 77 }; 78 79 80 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v) 81 { 82 writeb(v, par->dac + reg / 4); 83 } 84 85 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg) 86 { 87 return readb(par->dac + reg / 4); 88 } 89 90 91 /* 92 * Set the palette. 93 */ 94 static int pmagbafb_setcolreg(unsigned int regno, unsigned int red, 95 unsigned int green, unsigned int blue, 96 unsigned int transp, struct fb_info *info) 97 { 98 struct pmagbafb_par *par = info->par; 99 100 if (regno >= info->cmap.len) 101 return 1; 102 103 red >>= 8; /* The cmap fields are 16 bits */ 104 green >>= 8; /* wide, but the hardware colormap */ 105 blue >>= 8; /* registers are only 8 bits wide */ 106 107 mb(); 108 dac_write(par, BT459_ADDR_LO, regno); 109 dac_write(par, BT459_ADDR_HI, 0x00); 110 wmb(); 111 dac_write(par, BT459_CMAP, red); 112 wmb(); 113 dac_write(par, BT459_CMAP, green); 114 wmb(); 115 dac_write(par, BT459_CMAP, blue); 116 117 return 0; 118 } 119 120 static const struct fb_ops pmagbafb_ops = { 121 .owner = THIS_MODULE, 122 .fb_setcolreg = pmagbafb_setcolreg, 123 .fb_fillrect = cfb_fillrect, 124 .fb_copyarea = cfb_copyarea, 125 .fb_imageblit = cfb_imageblit, 126 }; 127 128 129 /* 130 * Turn the hardware cursor off. 131 */ 132 static void pmagbafb_erase_cursor(struct fb_info *info) 133 { 134 struct pmagbafb_par *par = info->par; 135 136 mb(); 137 dac_write(par, BT459_ADDR_LO, 0x00); 138 dac_write(par, BT459_ADDR_HI, 0x03); 139 wmb(); 140 dac_write(par, BT459_DATA, 0x00); 141 } 142 143 144 static int pmagbafb_probe(struct device *dev) 145 { 146 struct tc_dev *tdev = to_tc_dev(dev); 147 resource_size_t start, len; 148 struct fb_info *info; 149 struct pmagbafb_par *par; 150 int err; 151 152 info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev); 153 if (!info) 154 return -ENOMEM; 155 156 par = info->par; 157 dev_set_drvdata(dev, info); 158 159 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 160 printk(KERN_ERR "%s: Cannot allocate color map\n", 161 dev_name(dev)); 162 err = -ENOMEM; 163 goto err_alloc; 164 } 165 166 info->fbops = &pmagbafb_ops; 167 info->fix = pmagbafb_fix; 168 info->var = pmagbafb_defined; 169 170 /* Request the I/O MEM resource. */ 171 start = tdev->resource.start; 172 len = tdev->resource.end - start + 1; 173 if (!request_mem_region(start, len, dev_name(dev))) { 174 printk(KERN_ERR "%s: Cannot reserve FB region\n", 175 dev_name(dev)); 176 err = -EBUSY; 177 goto err_cmap; 178 } 179 180 /* MMIO mapping setup. */ 181 info->fix.mmio_start = start; 182 par->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len); 183 if (!par->mmio) { 184 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev)); 185 err = -ENOMEM; 186 goto err_resource; 187 } 188 par->dac = par->mmio + PMAG_BA_BT459; 189 190 /* Frame buffer mapping setup. */ 191 info->fix.smem_start = start + PMAG_BA_FBMEM; 192 info->screen_base = ioremap(info->fix.smem_start, 193 info->fix.smem_len); 194 if (!info->screen_base) { 195 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev)); 196 err = -ENOMEM; 197 goto err_mmio_map; 198 } 199 info->screen_size = info->fix.smem_len; 200 201 pmagbafb_erase_cursor(info); 202 203 err = register_framebuffer(info); 204 if (err < 0) { 205 printk(KERN_ERR "%s: Cannot register framebuffer\n", 206 dev_name(dev)); 207 goto err_smem_map; 208 } 209 210 get_device(dev); 211 212 fb_info(info, "%s frame buffer device at %s\n", 213 info->fix.id, dev_name(dev)); 214 215 return 0; 216 217 218 err_smem_map: 219 iounmap(info->screen_base); 220 221 err_mmio_map: 222 iounmap(par->mmio); 223 224 err_resource: 225 release_mem_region(start, len); 226 227 err_cmap: 228 fb_dealloc_cmap(&info->cmap); 229 230 err_alloc: 231 framebuffer_release(info); 232 return err; 233 } 234 235 static int pmagbafb_remove(struct device *dev) 236 { 237 struct tc_dev *tdev = to_tc_dev(dev); 238 struct fb_info *info = dev_get_drvdata(dev); 239 struct pmagbafb_par *par = info->par; 240 resource_size_t start, len; 241 242 put_device(dev); 243 unregister_framebuffer(info); 244 iounmap(info->screen_base); 245 iounmap(par->mmio); 246 start = tdev->resource.start; 247 len = tdev->resource.end - start + 1; 248 release_mem_region(start, len); 249 fb_dealloc_cmap(&info->cmap); 250 framebuffer_release(info); 251 return 0; 252 } 253 254 255 /* 256 * Initialize the framebuffer. 257 */ 258 static const struct tc_device_id pmagbafb_tc_table[] = { 259 { "DEC ", "PMAG-BA " }, 260 { } 261 }; 262 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table); 263 264 static struct tc_driver pmagbafb_driver = { 265 .id_table = pmagbafb_tc_table, 266 .driver = { 267 .name = "pmagbafb", 268 .bus = &tc_bus_type, 269 .probe = pmagbafb_probe, 270 .remove = pmagbafb_remove, 271 }, 272 }; 273 274 static int __init pmagbafb_init(void) 275 { 276 #ifndef MODULE 277 if (fb_get_options("pmagbafb", NULL)) 278 return -ENXIO; 279 #endif 280 return tc_register_driver(&pmagbafb_driver); 281 } 282 283 static void __exit pmagbafb_exit(void) 284 { 285 tc_unregister_driver(&pmagbafb_driver); 286 } 287 288 289 module_init(pmagbafb_init); 290 module_exit(pmagbafb_exit); 291 292 MODULE_LICENSE("GPL"); 293