Yoichi Yuasa | 5abe3b4 | 2008-07-23 21:31:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Cobalt server LCD frame buffer driver. |
| 3 | * |
Yoichi Yuasa | ada8e95 | 2009-07-03 00:39:38 +0900 | [diff] [blame] | 4 | * Copyright (C) 2008 Yoichi Yuasa <yuasa@linux-mips.org> |
Yoichi Yuasa | 5abe3b4 | 2008-07-23 21:31:40 -0700 | [diff] [blame] | 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> |
Paul Gortmaker | 355b200 | 2011-07-03 16:17:28 -0400 | [diff] [blame] | 27 | #include <linux/module.h> |
Yoichi Yuasa | 5abe3b4 | 2008-07-23 21:31:40 -0700 | [diff] [blame] | 28 | |
| 29 | /* |
| 30 | * Cursor position address |
| 31 | * \X 0 1 2 ... 14 15 |
| 32 | * Y+----+----+----+---+----+----+ |
| 33 | * 0|0x00|0x01|0x02|...|0x0e|0x0f| |
| 34 | * +----+----+----+---+----+----+ |
| 35 | * 1|0x40|0x41|0x42|...|0x4e|0x4f| |
| 36 | * +----+----+----+---+----+----+ |
| 37 | */ |
| 38 | #define LCD_DATA_REG_OFFSET 0x10 |
| 39 | #define LCD_XRES_MAX 16 |
| 40 | #define LCD_YRES_MAX 2 |
| 41 | #define LCD_CHARS_MAX 32 |
| 42 | |
| 43 | #define LCD_CLEAR 0x01 |
| 44 | #define LCD_CURSOR_MOVE_HOME 0x02 |
| 45 | #define LCD_RESET 0x06 |
| 46 | #define LCD_OFF 0x08 |
| 47 | #define LCD_CURSOR_OFF 0x0c |
| 48 | #define LCD_CURSOR_BLINK_OFF 0x0e |
| 49 | #define LCD_CURSOR_ON 0x0f |
| 50 | #define LCD_ON LCD_CURSOR_ON |
| 51 | #define LCD_CURSOR_MOVE_LEFT 0x10 |
| 52 | #define LCD_CURSOR_MOVE_RIGHT 0x14 |
| 53 | #define LCD_DISPLAY_LEFT 0x18 |
| 54 | #define LCD_DISPLAY_RIGHT 0x1c |
| 55 | #define LCD_PRERESET 0x3f /* execute 4 times continuously */ |
| 56 | #define LCD_BUSY 0x80 |
| 57 | |
| 58 | #define LCD_GRAPHIC_MODE 0x40 |
| 59 | #define LCD_TEXT_MODE 0x80 |
| 60 | #define LCD_CUR_POS_MASK 0x7f |
| 61 | |
| 62 | #define LCD_CUR_POS(x) ((x) & LCD_CUR_POS_MASK) |
| 63 | #define LCD_TEXT_POS(x) ((x) | LCD_TEXT_MODE) |
| 64 | |
| 65 | static inline void lcd_write_control(struct fb_info *info, u8 control) |
| 66 | { |
| 67 | writel((u32)control << 24, info->screen_base); |
| 68 | } |
| 69 | |
| 70 | static inline u8 lcd_read_control(struct fb_info *info) |
| 71 | { |
| 72 | return readl(info->screen_base) >> 24; |
| 73 | } |
| 74 | |
| 75 | static inline void lcd_write_data(struct fb_info *info, u8 data) |
| 76 | { |
| 77 | writel((u32)data << 24, info->screen_base + LCD_DATA_REG_OFFSET); |
| 78 | } |
| 79 | |
| 80 | static inline u8 lcd_read_data(struct fb_info *info) |
| 81 | { |
| 82 | return readl(info->screen_base + LCD_DATA_REG_OFFSET) >> 24; |
| 83 | } |
| 84 | |
| 85 | static int lcd_busy_wait(struct fb_info *info) |
| 86 | { |
| 87 | u8 val = 0; |
| 88 | int timeout = 10, retval = 0; |
| 89 | |
| 90 | do { |
| 91 | val = lcd_read_control(info); |
| 92 | val &= LCD_BUSY; |
| 93 | if (val != LCD_BUSY) |
| 94 | break; |
| 95 | |
| 96 | if (msleep_interruptible(1)) |
| 97 | return -EINTR; |
| 98 | |
| 99 | timeout--; |
| 100 | } while (timeout); |
| 101 | |
| 102 | if (val == LCD_BUSY) |
| 103 | retval = -EBUSY; |
| 104 | |
| 105 | return retval; |
| 106 | } |
| 107 | |
| 108 | static void lcd_clear(struct fb_info *info) |
| 109 | { |
| 110 | int i; |
| 111 | |
| 112 | for (i = 0; i < 4; i++) { |
| 113 | udelay(150); |
| 114 | |
| 115 | lcd_write_control(info, LCD_PRERESET); |
| 116 | } |
| 117 | |
| 118 | udelay(150); |
| 119 | |
| 120 | lcd_write_control(info, LCD_CLEAR); |
| 121 | |
| 122 | udelay(150); |
| 123 | |
| 124 | lcd_write_control(info, LCD_RESET); |
| 125 | } |
| 126 | |
Henrik Kretzschmar | 7d7fb0e | 2010-04-28 12:25:02 +0200 | [diff] [blame] | 127 | static struct fb_fix_screeninfo cobalt_lcdfb_fix __devinitdata = { |
Yoichi Yuasa | 5abe3b4 | 2008-07-23 21:31:40 -0700 | [diff] [blame] | 128 | .id = "cobalt-lcd", |
| 129 | .type = FB_TYPE_TEXT, |
| 130 | .type_aux = FB_AUX_TEXT_MDA, |
| 131 | .visual = FB_VISUAL_MONO01, |
| 132 | .line_length = LCD_XRES_MAX, |
| 133 | .accel = FB_ACCEL_NONE, |
| 134 | }; |
| 135 | |
| 136 | static ssize_t cobalt_lcdfb_read(struct fb_info *info, char __user *buf, |
| 137 | size_t count, loff_t *ppos) |
| 138 | { |
| 139 | char src[LCD_CHARS_MAX]; |
| 140 | unsigned long pos; |
| 141 | int len, retval = 0; |
| 142 | |
| 143 | pos = *ppos; |
| 144 | if (pos >= LCD_CHARS_MAX || count == 0) |
| 145 | return 0; |
| 146 | |
| 147 | if (count > LCD_CHARS_MAX) |
| 148 | count = LCD_CHARS_MAX; |
| 149 | |
| 150 | if (pos + count > LCD_CHARS_MAX) |
| 151 | count = LCD_CHARS_MAX - pos; |
| 152 | |
| 153 | for (len = 0; len < count; len++) { |
| 154 | retval = lcd_busy_wait(info); |
| 155 | if (retval < 0) |
| 156 | break; |
| 157 | |
| 158 | lcd_write_control(info, LCD_TEXT_POS(pos)); |
| 159 | |
| 160 | retval = lcd_busy_wait(info); |
| 161 | if (retval < 0) |
| 162 | break; |
| 163 | |
| 164 | src[len] = lcd_read_data(info); |
| 165 | if (pos == 0x0f) |
| 166 | pos = 0x40; |
| 167 | else |
| 168 | pos++; |
| 169 | } |
| 170 | |
| 171 | if (retval < 0 && signal_pending(current)) |
| 172 | return -ERESTARTSYS; |
| 173 | |
| 174 | if (copy_to_user(buf, src, len)) |
| 175 | return -EFAULT; |
| 176 | |
| 177 | *ppos += len; |
| 178 | |
| 179 | return len; |
| 180 | } |
| 181 | |
| 182 | static ssize_t cobalt_lcdfb_write(struct fb_info *info, const char __user *buf, |
| 183 | size_t count, loff_t *ppos) |
| 184 | { |
| 185 | char dst[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 | if (copy_from_user(dst, buf, count)) |
| 200 | return -EFAULT; |
| 201 | |
| 202 | for (len = 0; len < count; len++) { |
| 203 | retval = lcd_busy_wait(info); |
| 204 | if (retval < 0) |
| 205 | break; |
| 206 | |
| 207 | lcd_write_control(info, LCD_TEXT_POS(pos)); |
| 208 | |
| 209 | retval = lcd_busy_wait(info); |
| 210 | if (retval < 0) |
| 211 | break; |
| 212 | |
| 213 | lcd_write_data(info, dst[len]); |
| 214 | if (pos == 0x0f) |
| 215 | pos = 0x40; |
| 216 | else |
| 217 | pos++; |
| 218 | } |
| 219 | |
| 220 | if (retval < 0 && signal_pending(current)) |
| 221 | return -ERESTARTSYS; |
| 222 | |
| 223 | *ppos += len; |
| 224 | |
| 225 | return len; |
| 226 | } |
| 227 | |
| 228 | static int cobalt_lcdfb_blank(int blank_mode, struct fb_info *info) |
| 229 | { |
| 230 | int retval; |
| 231 | |
| 232 | retval = lcd_busy_wait(info); |
| 233 | if (retval < 0) |
| 234 | return retval; |
| 235 | |
| 236 | switch (blank_mode) { |
| 237 | case FB_BLANK_UNBLANK: |
| 238 | lcd_write_control(info, LCD_ON); |
| 239 | break; |
| 240 | default: |
| 241 | lcd_write_control(info, LCD_OFF); |
| 242 | break; |
| 243 | } |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static int cobalt_lcdfb_cursor(struct fb_info *info, struct fb_cursor *cursor) |
| 249 | { |
| 250 | u32 x, y; |
| 251 | int retval; |
| 252 | |
| 253 | switch (cursor->set) { |
| 254 | case FB_CUR_SETPOS: |
| 255 | x = cursor->image.dx; |
| 256 | y = cursor->image.dy; |
| 257 | if (x >= LCD_XRES_MAX || y >= LCD_YRES_MAX) |
| 258 | return -EINVAL; |
| 259 | |
| 260 | retval = lcd_busy_wait(info); |
| 261 | if (retval < 0) |
| 262 | return retval; |
| 263 | |
| 264 | lcd_write_control(info, |
| 265 | LCD_TEXT_POS(info->fix.line_length * y + x)); |
| 266 | break; |
| 267 | default: |
| 268 | return -EINVAL; |
| 269 | } |
| 270 | |
| 271 | retval = lcd_busy_wait(info); |
| 272 | if (retval < 0) |
| 273 | return retval; |
| 274 | |
| 275 | if (cursor->enable) |
| 276 | lcd_write_control(info, LCD_CURSOR_ON); |
| 277 | else |
| 278 | lcd_write_control(info, LCD_CURSOR_OFF); |
| 279 | |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static struct fb_ops cobalt_lcd_fbops = { |
| 284 | .owner = THIS_MODULE, |
| 285 | .fb_read = cobalt_lcdfb_read, |
| 286 | .fb_write = cobalt_lcdfb_write, |
| 287 | .fb_blank = cobalt_lcdfb_blank, |
| 288 | .fb_cursor = cobalt_lcdfb_cursor, |
| 289 | }; |
| 290 | |
Uwe Kleine-König | c2e1303 | 2010-02-04 20:56:51 +0100 | [diff] [blame] | 291 | static int __devinit cobalt_lcdfb_probe(struct platform_device *dev) |
Yoichi Yuasa | 5abe3b4 | 2008-07-23 21:31:40 -0700 | [diff] [blame] | 292 | { |
| 293 | struct fb_info *info; |
| 294 | struct resource *res; |
| 295 | int retval; |
| 296 | |
| 297 | info = framebuffer_alloc(0, &dev->dev); |
| 298 | if (!info) |
| 299 | return -ENOMEM; |
| 300 | |
| 301 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
| 302 | if (!res) { |
| 303 | framebuffer_release(info); |
| 304 | return -EBUSY; |
| 305 | } |
| 306 | |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 307 | info->screen_size = resource_size(res); |
Yoichi Yuasa | 5abe3b4 | 2008-07-23 21:31:40 -0700 | [diff] [blame] | 308 | info->screen_base = ioremap(res->start, info->screen_size); |
| 309 | info->fbops = &cobalt_lcd_fbops; |
| 310 | info->fix = cobalt_lcdfb_fix; |
| 311 | info->fix.smem_start = res->start; |
| 312 | info->fix.smem_len = info->screen_size; |
| 313 | info->pseudo_palette = NULL; |
| 314 | info->par = NULL; |
| 315 | info->flags = FBINFO_DEFAULT; |
| 316 | |
| 317 | retval = register_framebuffer(info); |
| 318 | if (retval < 0) { |
| 319 | iounmap(info->screen_base); |
| 320 | framebuffer_release(info); |
| 321 | return retval; |
| 322 | } |
| 323 | |
| 324 | platform_set_drvdata(dev, info); |
| 325 | |
| 326 | lcd_clear(info); |
| 327 | |
| 328 | printk(KERN_INFO "fb%d: Cobalt server LCD frame buffer device\n", |
| 329 | info->node); |
| 330 | |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | static int __devexit cobalt_lcdfb_remove(struct platform_device *dev) |
| 335 | { |
| 336 | struct fb_info *info; |
| 337 | |
| 338 | info = platform_get_drvdata(dev); |
| 339 | if (info) { |
| 340 | iounmap(info->screen_base); |
| 341 | unregister_framebuffer(info); |
| 342 | framebuffer_release(info); |
| 343 | } |
| 344 | |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | static struct platform_driver cobalt_lcdfb_driver = { |
| 349 | .probe = cobalt_lcdfb_probe, |
| 350 | .remove = __devexit_p(cobalt_lcdfb_remove), |
| 351 | .driver = { |
| 352 | .name = "cobalt-lcd", |
| 353 | .owner = THIS_MODULE, |
| 354 | }, |
| 355 | }; |
| 356 | |
| 357 | static int __init cobalt_lcdfb_init(void) |
| 358 | { |
| 359 | return platform_driver_register(&cobalt_lcdfb_driver); |
| 360 | } |
| 361 | |
| 362 | static void __exit cobalt_lcdfb_exit(void) |
| 363 | { |
| 364 | platform_driver_unregister(&cobalt_lcdfb_driver); |
| 365 | } |
| 366 | |
| 367 | module_init(cobalt_lcdfb_init); |
| 368 | module_exit(cobalt_lcdfb_exit); |
| 369 | |
| 370 | MODULE_LICENSE("GPL v2"); |
| 371 | MODULE_AUTHOR("Yoichi Yuasa"); |
| 372 | MODULE_DESCRIPTION("Cobalt server LCD frame buffer driver"); |