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#include <asm/system.h> 37 38#include <video/pmag-ba-fb.h> 39 40 41struct pmagbafb_par { 42 volatile void __iomem *mmio; 43 volatile u32 __iomem *dac; 44}; 45 46 47static struct fb_var_screeninfo pmagbafb_defined __devinitdata = { 48 .xres = 1024, 49 .yres = 864, 50 .xres_virtual = 1024, 51 .yres_virtual = 864, 52 .bits_per_pixel = 8, 53 .red.length = 8, 54 .green.length = 8, 55 .blue.length = 8, 56 .activate = FB_ACTIVATE_NOW, 57 .height = -1, 58 .width = -1, 59 .accel_flags = FB_ACCEL_NONE, 60 .pixclock = 14452, 61 .left_margin = 116, 62 .right_margin = 12, 63 .upper_margin = 34, 64 .lower_margin = 12, 65 .hsync_len = 128, 66 .vsync_len = 3, 67 .sync = FB_SYNC_ON_GREEN, 68 .vmode = FB_VMODE_NONINTERLACED, 69}; 70 71static struct fb_fix_screeninfo pmagbafb_fix __devinitdata = { 72 .id = "PMAG-BA", 73 .smem_len = (1024 * 1024), 74 .type = FB_TYPE_PACKED_PIXELS, 75 .visual = FB_VISUAL_PSEUDOCOLOR, 76 .line_length = 1024, 77 .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459, 78}; 79 80 81static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v) 82{ 83 writeb(v, par->dac + reg / 4); 84} 85 86static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg) 87{ 88 return readb(par->dac + reg / 4); 89} 90 91 92/* 93 * Set the palette. 94 */ 95static int pmagbafb_setcolreg(unsigned int regno, unsigned int red, 96 unsigned int green, unsigned int blue, 97 unsigned int transp, struct fb_info *info) 98{ 99 struct pmagbafb_par *par = info->par; 100 101 if (regno >= info->cmap.len) 102 return 1; 103 104 red >>= 8; /* The cmap fields are 16 bits */ 105 green >>= 8; /* wide, but the hardware colormap */ 106 blue >>= 8; /* registers are only 8 bits wide */ 107 108 mb(); 109 dac_write(par, BT459_ADDR_LO, regno); 110 dac_write(par, BT459_ADDR_HI, 0x00); 111 wmb(); 112 dac_write(par, BT459_CMAP, red); 113 wmb(); 114 dac_write(par, BT459_CMAP, green); 115 wmb(); 116 dac_write(par, BT459_CMAP, blue); 117 118 return 0; 119} 120 121static struct fb_ops pmagbafb_ops = { 122 .owner = THIS_MODULE, 123 .fb_setcolreg = pmagbafb_setcolreg, 124 .fb_fillrect = cfb_fillrect, 125 .fb_copyarea = cfb_copyarea, 126 .fb_imageblit = cfb_imageblit, 127}; 128 129 130/* 131 * Turn the hardware cursor off. 132 */ 133static void __init pmagbafb_erase_cursor(struct fb_info *info) 134{ 135 struct pmagbafb_par *par = info->par; 136 137 mb(); 138 dac_write(par, BT459_ADDR_LO, 0x00); 139 dac_write(par, BT459_ADDR_HI, 0x03); 140 wmb(); 141 dac_write(par, BT459_DATA, 0x00); 142} 143 144 145static int __devinit pmagbafb_probe(struct device *dev) 146{ 147 struct tc_dev *tdev = to_tc_dev(dev); 148 resource_size_t start, len; 149 struct fb_info *info; 150 struct pmagbafb_par *par; 151 int err; 152 153 info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev); 154 if (!info) { 155 printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev)); 156 return -ENOMEM; 157 } 158 159 par = info->par; 160 dev_set_drvdata(dev, info); 161 162 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 163 printk(KERN_ERR "%s: Cannot allocate color map\n", 164 dev_name(dev)); 165 err = -ENOMEM; 166 goto err_alloc; 167 } 168 169 info->fbops = &pmagbafb_ops; 170 info->fix = pmagbafb_fix; 171 info->var = pmagbafb_defined; 172 info->flags = FBINFO_DEFAULT; 173 174 /* Request the I/O MEM resource. */ 175 start = tdev->resource.start; 176 len = tdev->resource.end - start + 1; 177 if (!request_mem_region(start, len, dev_name(dev))) { 178 printk(KERN_ERR "%s: Cannot reserve FB region\n", 179 dev_name(dev)); 180 err = -EBUSY; 181 goto err_cmap; 182 } 183 184 /* MMIO mapping setup. */ 185 info->fix.mmio_start = start; 186 par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); 187 if (!par->mmio) { 188 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev)); 189 err = -ENOMEM; 190 goto err_resource; 191 } 192 par->dac = par->mmio + PMAG_BA_BT459; 193 194 /* Frame buffer mapping setup. */ 195 info->fix.smem_start = start + PMAG_BA_FBMEM; 196 info->screen_base = ioremap_nocache(info->fix.smem_start, 197 info->fix.smem_len); 198 if (!info->screen_base) { 199 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev)); 200 err = -ENOMEM; 201 goto err_mmio_map; 202 } 203 info->screen_size = info->fix.smem_len; 204 205 pmagbafb_erase_cursor(info); 206 207 err = register_framebuffer(info); 208 if (err < 0) { 209 printk(KERN_ERR "%s: Cannot register framebuffer\n", 210 dev_name(dev)); 211 goto err_smem_map; 212 } 213 214 get_device(dev); 215 216 pr_info("fb%d: %s frame buffer device at %s\n", 217 info->node, info->fix.id, dev_name(dev)); 218 219 return 0; 220 221 222err_smem_map: 223 iounmap(info->screen_base); 224 225err_mmio_map: 226 iounmap(par->mmio); 227 228err_resource: 229 release_mem_region(start, len); 230 231err_cmap: 232 fb_dealloc_cmap(&info->cmap); 233 234err_alloc: 235 framebuffer_release(info); 236 return err; 237} 238 239static int __exit pmagbafb_remove(struct device *dev) 240{ 241 struct tc_dev *tdev = to_tc_dev(dev); 242 struct fb_info *info = dev_get_drvdata(dev); 243 struct pmagbafb_par *par = info->par; 244 resource_size_t start, len; 245 246 put_device(dev); 247 unregister_framebuffer(info); 248 iounmap(info->screen_base); 249 iounmap(par->mmio); 250 start = tdev->resource.start; 251 len = tdev->resource.end - start + 1; 252 release_mem_region(start, len); 253 fb_dealloc_cmap(&info->cmap); 254 framebuffer_release(info); 255 return 0; 256} 257 258 259/* 260 * Initialize the framebuffer. 261 */ 262static const struct tc_device_id pmagbafb_tc_table[] = { 263 { "DEC ", "PMAG-BA " }, 264 { } 265}; 266MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table); 267 268static struct tc_driver pmagbafb_driver = { 269 .id_table = pmagbafb_tc_table, 270 .driver = { 271 .name = "pmagbafb", 272 .bus = &tc_bus_type, 273 .probe = pmagbafb_probe, 274 .remove = __exit_p(pmagbafb_remove), 275 }, 276}; 277 278static int __init pmagbafb_init(void) 279{ 280#ifndef MODULE 281 if (fb_get_options("pmagbafb", NULL)) 282 return -ENXIO; 283#endif 284 return tc_register_driver(&pmagbafb_driver); 285} 286 287static void __exit pmagbafb_exit(void) 288{ 289 tc_unregister_driver(&pmagbafb_driver); 290} 291 292 293module_init(pmagbafb_init); 294module_exit(pmagbafb_exit); 295 296MODULE_LICENSE("GPL"); 297