1/* 2 * Cobalt server LCD frame buffer driver. 3 * 4 * Copyright (C) 2008 Yoichi Yuasa <yuasa@linux-mips.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20#include <linux/delay.h> 21#include <linux/fb.h> 22#include <linux/init.h> 23#include <linux/io.h> 24#include <linux/ioport.h> 25#include <linux/uaccess.h> 26#include <linux/platform_device.h> 27 28/* 29 * Cursor position address 30 * \X 0 1 2 ... 14 15 31 * Y+----+----+----+---+----+----+ 32 * 0|0x00|0x01|0x02|...|0x0e|0x0f| 33 * +----+----+----+---+----+----+ 34 * 1|0x40|0x41|0x42|...|0x4e|0x4f| 35 * +----+----+----+---+----+----+ 36 */ 37#define LCD_XRES_MAX 16 38#define LCD_YRES_MAX 2 39#define LCD_CHARS_MAX 32 40 41#define LCD_CLEAR 0x01 42#define LCD_CURSOR_MOVE_HOME 0x02 43#define LCD_RESET 0x06 44#define LCD_OFF 0x08 45#define LCD_CURSOR_OFF 0x0c 46#define LCD_CURSOR_BLINK_OFF 0x0e 47#define LCD_CURSOR_ON 0x0f 48#define LCD_ON LCD_CURSOR_ON 49#define LCD_CURSOR_MOVE_LEFT 0x10 50#define LCD_CURSOR_MOVE_RIGHT 0x14 51#define LCD_DISPLAY_LEFT 0x18 52#define LCD_DISPLAY_RIGHT 0x1c 53#define LCD_PRERESET 0x3f /* execute 4 times continuously */ 54#define LCD_BUSY 0x80 55 56#define LCD_GRAPHIC_MODE 0x40 57#define LCD_TEXT_MODE 0x80 58#define LCD_CUR_POS_MASK 0x7f 59 60#define LCD_CUR_POS(x) ((x) & LCD_CUR_POS_MASK) 61#define LCD_TEXT_POS(x) ((x) | LCD_TEXT_MODE) 62 63 64#ifdef CONFIG_MIPS_SEAD3 65 66#define LCD_CTL 0x00 67#define LCD_DATA 0x08 68#define CPLD_STATUS 0x10 69#define CPLD_DATA 0x18 70 71static inline void cpld_wait(struct fb_info *info) 72{ 73 do { 74 } while (readl(info->screen_base + CPLD_STATUS) & 1); 75} 76 77static inline void lcd_write_control(struct fb_info *info, u8 control) 78{ 79 cpld_wait(info); 80 writel(control, info->screen_base + LCD_CTL); 81} 82 83static inline u8 lcd_read_control(struct fb_info *info) 84{ 85 cpld_wait(info); 86 readl(info->screen_base + LCD_CTL); 87 cpld_wait(info); 88 return readl(info->screen_base + CPLD_DATA) & 0xff; 89} 90 91static inline void lcd_write_data(struct fb_info *info, u8 data) 92{ 93 cpld_wait(info); 94 writel(data, info->screen_base + LCD_DATA); 95} 96 97static inline u8 lcd_read_data(struct fb_info *info) 98{ 99 cpld_wait(info); 100 readl(info->screen_base + LCD_DATA); 101 cpld_wait(info); 102 return readl(info->screen_base + CPLD_DATA) & 0xff; 103} 104#endif 105 106#ifdef CONFIG_MIPS_COBALT 107 108#define LCD_DATA_REG_OFFSET 0x10 109 110static inline void lcd_write_control(struct fb_info *info, u8 control) 111{ 112 writel((u32)control << 24, info->screen_base); 113} 114 115static inline u8 lcd_read_control(struct fb_info *info) 116{ 117 return readl(info->screen_base) >> 24; 118} 119 120static inline void lcd_write_data(struct fb_info *info, u8 data) 121{ 122 writel((u32)data << 24, info->screen_base + LCD_DATA_REG_OFFSET); 123} 124 125static inline u8 lcd_read_data(struct fb_info *info) 126{ 127 return readl(info->screen_base + LCD_DATA_REG_OFFSET) >> 24; 128} 129#endif 130 131static int lcd_busy_wait(struct fb_info *info) 132{ 133 u8 val = 0; 134 int timeout = 10, retval = 0; 135 136 do { 137 val = lcd_read_control(info); 138 val &= LCD_BUSY; 139 if (val != LCD_BUSY) 140 break; 141 142 if (msleep_interruptible(1)) 143 return -EINTR; 144 145 timeout--; 146 } while (timeout); 147 148 if (val == LCD_BUSY) 149 retval = -EBUSY; 150 151 return retval; 152} 153 154static void lcd_clear(struct fb_info *info) 155{ 156 int i; 157 158 for (i = 0; i < 4; i++) { 159 udelay(150); 160 161 lcd_write_control(info, LCD_PRERESET); 162 } 163 164 udelay(150); 165 166 lcd_write_control(info, LCD_CLEAR); 167 168 udelay(150); 169 170 lcd_write_control(info, LCD_RESET); 171} 172 173static struct fb_fix_screeninfo cobalt_lcdfb_fix __devinitdata = { 174 .id = "cobalt-lcd", 175 .type = FB_TYPE_TEXT, 176 .type_aux = FB_AUX_TEXT_MDA, 177 .visual = FB_VISUAL_MONO01, 178 .line_length = LCD_XRES_MAX, 179 .accel = FB_ACCEL_NONE, 180}; 181 182static ssize_t cobalt_lcdfb_read(struct fb_info *info, char __user *buf, 183 size_t count, loff_t *ppos) 184{ 185 char src[LCD_CHARS_MAX]; 186 unsigned long pos; 187 int len, retval = 0; 188 189 pos = *ppos; 190 if (pos >= LCD_CHARS_MAX || count == 0) 191 return 0; 192 193 if (count > LCD_CHARS_MAX) 194 count = LCD_CHARS_MAX; 195 196 if (pos + count > LCD_CHARS_MAX) 197 count = LCD_CHARS_MAX - pos; 198 199 for (len = 0; len < count; len++) { 200 retval = lcd_busy_wait(info); 201 if (retval < 0) 202 break; 203 204 lcd_write_control(info, LCD_TEXT_POS(pos)); 205 206 retval = lcd_busy_wait(info); 207 if (retval < 0) 208 break; 209 210 src[len] = lcd_read_data(info); 211 if (pos == 0x0f) 212 pos = 0x40; 213 else 214 pos++; 215 } 216 217 if (retval < 0 && signal_pending(current)) 218 return -ERESTARTSYS; 219 220 if (copy_to_user(buf, src, len)) 221 return -EFAULT; 222 223 *ppos += len; 224 225 return len; 226} 227 228static ssize_t cobalt_lcdfb_write(struct fb_info *info, const char __user *buf, 229 size_t count, loff_t *ppos) 230{ 231 char dst[LCD_CHARS_MAX]; 232 unsigned long pos; 233 int len, retval = 0; 234 235 pos = *ppos; 236 if (pos >= LCD_CHARS_MAX || count == 0) 237 return 0; 238 239 if (count > LCD_CHARS_MAX) 240 count = LCD_CHARS_MAX; 241 242 if (pos + count > LCD_CHARS_MAX) 243 count = LCD_CHARS_MAX - pos; 244 245 if (copy_from_user(dst, buf, count)) 246 return -EFAULT; 247 248 for (len = 0; len < count; len++) { 249 retval = lcd_busy_wait(info); 250 if (retval < 0) 251 break; 252 253 lcd_write_control(info, LCD_TEXT_POS(pos)); 254 255 retval = lcd_busy_wait(info); 256 if (retval < 0) 257 break; 258 259 lcd_write_data(info, dst[len]); 260 if (pos == 0x0f) 261 pos = 0x40; 262 else 263 pos++; 264 } 265 266 if (retval < 0 && signal_pending(current)) 267 return -ERESTARTSYS; 268 269 *ppos += len; 270 271 return len; 272} 273 274static int cobalt_lcdfb_blank(int blank_mode, struct fb_info *info) 275{ 276 int retval; 277 278 retval = lcd_busy_wait(info); 279 if (retval < 0) 280 return retval; 281 282 switch (blank_mode) { 283 case FB_BLANK_UNBLANK: 284 lcd_write_control(info, LCD_ON); 285 break; 286 default: 287 lcd_write_control(info, LCD_OFF); 288 break; 289 } 290 291 return 0; 292} 293 294static int cobalt_lcdfb_cursor(struct fb_info *info, struct fb_cursor *cursor) 295{ 296 u32 x, y; 297 int retval; 298 299 switch (cursor->set) { 300 case FB_CUR_SETPOS: 301 x = cursor->image.dx; 302 y = cursor->image.dy; 303 if (x >= LCD_XRES_MAX || y >= LCD_YRES_MAX) 304 return -EINVAL; 305 306 retval = lcd_busy_wait(info); 307 if (retval < 0) 308 return retval; 309 310 lcd_write_control(info, 311 LCD_TEXT_POS(info->fix.line_length * y + x)); 312 break; 313 default: 314 return -EINVAL; 315 } 316 317 retval = lcd_busy_wait(info); 318 if (retval < 0) 319 return retval; 320 321 if (cursor->enable) 322 lcd_write_control(info, LCD_CURSOR_ON); 323 else 324 lcd_write_control(info, LCD_CURSOR_OFF); 325 326 return 0; 327} 328 329static struct fb_ops cobalt_lcd_fbops = { 330 .owner = THIS_MODULE, 331 .fb_read = cobalt_lcdfb_read, 332 .fb_write = cobalt_lcdfb_write, 333 .fb_blank = cobalt_lcdfb_blank, 334 .fb_cursor = cobalt_lcdfb_cursor, 335}; 336 337static int __devinit cobalt_lcdfb_probe(struct platform_device *dev) 338{ 339 struct fb_info *info; 340 struct resource *res; 341 int retval; 342 343 info = framebuffer_alloc(0, &dev->dev); 344 if (!info) 345 return -ENOMEM; 346 347 res = platform_get_resource(dev, IORESOURCE_MEM, 0); 348 if (!res) { 349 framebuffer_release(info); 350 return -EBUSY; 351 } 352 353 info->screen_size = res->end - res->start + 1; 354 info->screen_base = ioremap(res->start, info->screen_size); 355 info->fbops = &cobalt_lcd_fbops; 356 info->fix = cobalt_lcdfb_fix; 357 info->fix.smem_start = res->start; 358 info->fix.smem_len = info->screen_size; 359 info->pseudo_palette = NULL; 360 info->par = NULL; 361 info->flags = FBINFO_DEFAULT; 362 363 retval = register_framebuffer(info); 364 if (retval < 0) { 365 iounmap(info->screen_base); 366 framebuffer_release(info); 367 return retval; 368 } 369 370 platform_set_drvdata(dev, info); 371 372 lcd_clear(info); 373 374 printk(KERN_INFO "fb%d: Cobalt server LCD frame buffer device\n", 375 info->node); 376 377 return 0; 378} 379 380static int __devexit cobalt_lcdfb_remove(struct platform_device *dev) 381{ 382 struct fb_info *info; 383 384 info = platform_get_drvdata(dev); 385 if (info) { 386 iounmap(info->screen_base); 387 unregister_framebuffer(info); 388 framebuffer_release(info); 389 } 390 391 return 0; 392} 393 394static struct platform_driver cobalt_lcdfb_driver = { 395 .probe = cobalt_lcdfb_probe, 396 .remove = __devexit_p(cobalt_lcdfb_remove), 397 .driver = { 398 .name = "cobalt-lcd", 399 .owner = THIS_MODULE, 400 }, 401}; 402 403static int __init cobalt_lcdfb_init(void) 404{ 405 return platform_driver_register(&cobalt_lcdfb_driver); 406} 407 408static void __exit cobalt_lcdfb_exit(void) 409{ 410 platform_driver_unregister(&cobalt_lcdfb_driver); 411} 412 413module_init(cobalt_lcdfb_init); 414module_exit(cobalt_lcdfb_exit); 415 416MODULE_LICENSE("GPL v2"); 417MODULE_AUTHOR("Yoichi Yuasa"); 418MODULE_DESCRIPTION("Cobalt server LCD frame buffer driver"); 419