Commit | Line | Data |
---|---|---|
5abe3b40 YY |
1 | /* |
2 | * Cobalt server LCD frame buffer driver. | |
3 | * | |
ada8e951 | 4 | * Copyright (C) 2008 Yoichi Yuasa <yuasa@linux-mips.org> |
5abe3b40 YY |
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_DATA_REG_OFFSET 0x10 | |
38 | #define LCD_XRES_MAX 16 | |
39 | #define LCD_YRES_MAX 2 | |
40 | #define LCD_CHARS_MAX 32 | |
41 | ||
42 | #define LCD_CLEAR 0x01 | |
43 | #define LCD_CURSOR_MOVE_HOME 0x02 | |
44 | #define LCD_RESET 0x06 | |
45 | #define LCD_OFF 0x08 | |
46 | #define LCD_CURSOR_OFF 0x0c | |
47 | #define LCD_CURSOR_BLINK_OFF 0x0e | |
48 | #define LCD_CURSOR_ON 0x0f | |
49 | #define LCD_ON LCD_CURSOR_ON | |
50 | #define LCD_CURSOR_MOVE_LEFT 0x10 | |
51 | #define LCD_CURSOR_MOVE_RIGHT 0x14 | |
52 | #define LCD_DISPLAY_LEFT 0x18 | |
53 | #define LCD_DISPLAY_RIGHT 0x1c | |
54 | #define LCD_PRERESET 0x3f /* execute 4 times continuously */ | |
55 | #define LCD_BUSY 0x80 | |
56 | ||
57 | #define LCD_GRAPHIC_MODE 0x40 | |
58 | #define LCD_TEXT_MODE 0x80 | |
59 | #define LCD_CUR_POS_MASK 0x7f | |
60 | ||
61 | #define LCD_CUR_POS(x) ((x) & LCD_CUR_POS_MASK) | |
62 | #define LCD_TEXT_POS(x) ((x) | LCD_TEXT_MODE) | |
63 | ||
64 | static inline void lcd_write_control(struct fb_info *info, u8 control) | |
65 | { | |
66 | writel((u32)control << 24, info->screen_base); | |
67 | } | |
68 | ||
69 | static inline u8 lcd_read_control(struct fb_info *info) | |
70 | { | |
71 | return readl(info->screen_base) >> 24; | |
72 | } | |
73 | ||
74 | static inline void lcd_write_data(struct fb_info *info, u8 data) | |
75 | { | |
76 | writel((u32)data << 24, info->screen_base + LCD_DATA_REG_OFFSET); | |
77 | } | |
78 | ||
79 | static inline u8 lcd_read_data(struct fb_info *info) | |
80 | { | |
81 | return readl(info->screen_base + LCD_DATA_REG_OFFSET) >> 24; | |
82 | } | |
83 | ||
84 | static int lcd_busy_wait(struct fb_info *info) | |
85 | { | |
86 | u8 val = 0; | |
87 | int timeout = 10, retval = 0; | |
88 | ||
89 | do { | |
90 | val = lcd_read_control(info); | |
91 | val &= LCD_BUSY; | |
92 | if (val != LCD_BUSY) | |
93 | break; | |
94 | ||
95 | if (msleep_interruptible(1)) | |
96 | return -EINTR; | |
97 | ||
98 | timeout--; | |
99 | } while (timeout); | |
100 | ||
101 | if (val == LCD_BUSY) | |
102 | retval = -EBUSY; | |
103 | ||
104 | return retval; | |
105 | } | |
106 | ||
107 | static void lcd_clear(struct fb_info *info) | |
108 | { | |
109 | int i; | |
110 | ||
111 | for (i = 0; i < 4; i++) { | |
112 | udelay(150); | |
113 | ||
114 | lcd_write_control(info, LCD_PRERESET); | |
115 | } | |
116 | ||
117 | udelay(150); | |
118 | ||
119 | lcd_write_control(info, LCD_CLEAR); | |
120 | ||
121 | udelay(150); | |
122 | ||
123 | lcd_write_control(info, LCD_RESET); | |
124 | } | |
125 | ||
126 | static struct fb_fix_screeninfo cobalt_lcdfb_fix __initdata = { | |
127 | .id = "cobalt-lcd", | |
128 | .type = FB_TYPE_TEXT, | |
129 | .type_aux = FB_AUX_TEXT_MDA, | |
130 | .visual = FB_VISUAL_MONO01, | |
131 | .line_length = LCD_XRES_MAX, | |
132 | .accel = FB_ACCEL_NONE, | |
133 | }; | |
134 | ||
135 | static ssize_t cobalt_lcdfb_read(struct fb_info *info, char __user *buf, | |
136 | size_t count, loff_t *ppos) | |
137 | { | |
138 | char src[LCD_CHARS_MAX]; | |
139 | unsigned long pos; | |
140 | int len, retval = 0; | |
141 | ||
142 | pos = *ppos; | |
143 | if (pos >= LCD_CHARS_MAX || count == 0) | |
144 | return 0; | |
145 | ||
146 | if (count > LCD_CHARS_MAX) | |
147 | count = LCD_CHARS_MAX; | |
148 | ||
149 | if (pos + count > LCD_CHARS_MAX) | |
150 | count = LCD_CHARS_MAX - pos; | |
151 | ||
152 | for (len = 0; len < count; len++) { | |
153 | retval = lcd_busy_wait(info); | |
154 | if (retval < 0) | |
155 | break; | |
156 | ||
157 | lcd_write_control(info, LCD_TEXT_POS(pos)); | |
158 | ||
159 | retval = lcd_busy_wait(info); | |
160 | if (retval < 0) | |
161 | break; | |
162 | ||
163 | src[len] = lcd_read_data(info); | |
164 | if (pos == 0x0f) | |
165 | pos = 0x40; | |
166 | else | |
167 | pos++; | |
168 | } | |
169 | ||
170 | if (retval < 0 && signal_pending(current)) | |
171 | return -ERESTARTSYS; | |
172 | ||
173 | if (copy_to_user(buf, src, len)) | |
174 | return -EFAULT; | |
175 | ||
176 | *ppos += len; | |
177 | ||
178 | return len; | |
179 | } | |
180 | ||
181 | static ssize_t cobalt_lcdfb_write(struct fb_info *info, const char __user *buf, | |
182 | size_t count, loff_t *ppos) | |
183 | { | |
184 | char dst[LCD_CHARS_MAX]; | |
185 | unsigned long pos; | |
186 | int len, retval = 0; | |
187 | ||
188 | pos = *ppos; | |
189 | if (pos >= LCD_CHARS_MAX || count == 0) | |
190 | return 0; | |
191 | ||
192 | if (count > LCD_CHARS_MAX) | |
193 | count = LCD_CHARS_MAX; | |
194 | ||
195 | if (pos + count > LCD_CHARS_MAX) | |
196 | count = LCD_CHARS_MAX - pos; | |
197 | ||
198 | if (copy_from_user(dst, buf, count)) | |
199 | return -EFAULT; | |
200 | ||
201 | for (len = 0; len < count; len++) { | |
202 | retval = lcd_busy_wait(info); | |
203 | if (retval < 0) | |
204 | break; | |
205 | ||
206 | lcd_write_control(info, LCD_TEXT_POS(pos)); | |
207 | ||
208 | retval = lcd_busy_wait(info); | |
209 | if (retval < 0) | |
210 | break; | |
211 | ||
212 | lcd_write_data(info, dst[len]); | |
213 | if (pos == 0x0f) | |
214 | pos = 0x40; | |
215 | else | |
216 | pos++; | |
217 | } | |
218 | ||
219 | if (retval < 0 && signal_pending(current)) | |
220 | return -ERESTARTSYS; | |
221 | ||
222 | *ppos += len; | |
223 | ||
224 | return len; | |
225 | } | |
226 | ||
227 | static int cobalt_lcdfb_blank(int blank_mode, struct fb_info *info) | |
228 | { | |
229 | int retval; | |
230 | ||
231 | retval = lcd_busy_wait(info); | |
232 | if (retval < 0) | |
233 | return retval; | |
234 | ||
235 | switch (blank_mode) { | |
236 | case FB_BLANK_UNBLANK: | |
237 | lcd_write_control(info, LCD_ON); | |
238 | break; | |
239 | default: | |
240 | lcd_write_control(info, LCD_OFF); | |
241 | break; | |
242 | } | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static int cobalt_lcdfb_cursor(struct fb_info *info, struct fb_cursor *cursor) | |
248 | { | |
249 | u32 x, y; | |
250 | int retval; | |
251 | ||
252 | switch (cursor->set) { | |
253 | case FB_CUR_SETPOS: | |
254 | x = cursor->image.dx; | |
255 | y = cursor->image.dy; | |
256 | if (x >= LCD_XRES_MAX || y >= LCD_YRES_MAX) | |
257 | return -EINVAL; | |
258 | ||
259 | retval = lcd_busy_wait(info); | |
260 | if (retval < 0) | |
261 | return retval; | |
262 | ||
263 | lcd_write_control(info, | |
264 | LCD_TEXT_POS(info->fix.line_length * y + x)); | |
265 | break; | |
266 | default: | |
267 | return -EINVAL; | |
268 | } | |
269 | ||
270 | retval = lcd_busy_wait(info); | |
271 | if (retval < 0) | |
272 | return retval; | |
273 | ||
274 | if (cursor->enable) | |
275 | lcd_write_control(info, LCD_CURSOR_ON); | |
276 | else | |
277 | lcd_write_control(info, LCD_CURSOR_OFF); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static struct fb_ops cobalt_lcd_fbops = { | |
283 | .owner = THIS_MODULE, | |
284 | .fb_read = cobalt_lcdfb_read, | |
285 | .fb_write = cobalt_lcdfb_write, | |
286 | .fb_blank = cobalt_lcdfb_blank, | |
287 | .fb_cursor = cobalt_lcdfb_cursor, | |
288 | }; | |
289 | ||
290 | static int __init cobalt_lcdfb_probe(struct platform_device *dev) | |
291 | { | |
292 | struct fb_info *info; | |
293 | struct resource *res; | |
294 | int retval; | |
295 | ||
296 | info = framebuffer_alloc(0, &dev->dev); | |
297 | if (!info) | |
298 | return -ENOMEM; | |
299 | ||
300 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
301 | if (!res) { | |
302 | framebuffer_release(info); | |
303 | return -EBUSY; | |
304 | } | |
305 | ||
306 | info->screen_size = res->end - res->start + 1; | |
307 | info->screen_base = ioremap(res->start, info->screen_size); | |
308 | info->fbops = &cobalt_lcd_fbops; | |
309 | info->fix = cobalt_lcdfb_fix; | |
310 | info->fix.smem_start = res->start; | |
311 | info->fix.smem_len = info->screen_size; | |
312 | info->pseudo_palette = NULL; | |
313 | info->par = NULL; | |
314 | info->flags = FBINFO_DEFAULT; | |
315 | ||
316 | retval = register_framebuffer(info); | |
317 | if (retval < 0) { | |
318 | iounmap(info->screen_base); | |
319 | framebuffer_release(info); | |
320 | return retval; | |
321 | } | |
322 | ||
323 | platform_set_drvdata(dev, info); | |
324 | ||
325 | lcd_clear(info); | |
326 | ||
327 | printk(KERN_INFO "fb%d: Cobalt server LCD frame buffer device\n", | |
328 | info->node); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | static int __devexit cobalt_lcdfb_remove(struct platform_device *dev) | |
334 | { | |
335 | struct fb_info *info; | |
336 | ||
337 | info = platform_get_drvdata(dev); | |
338 | if (info) { | |
339 | iounmap(info->screen_base); | |
340 | unregister_framebuffer(info); | |
341 | framebuffer_release(info); | |
342 | } | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | static struct platform_driver cobalt_lcdfb_driver = { | |
348 | .probe = cobalt_lcdfb_probe, | |
349 | .remove = __devexit_p(cobalt_lcdfb_remove), | |
350 | .driver = { | |
351 | .name = "cobalt-lcd", | |
352 | .owner = THIS_MODULE, | |
353 | }, | |
354 | }; | |
355 | ||
356 | static int __init cobalt_lcdfb_init(void) | |
357 | { | |
358 | return platform_driver_register(&cobalt_lcdfb_driver); | |
359 | } | |
360 | ||
361 | static void __exit cobalt_lcdfb_exit(void) | |
362 | { | |
363 | platform_driver_unregister(&cobalt_lcdfb_driver); | |
364 | } | |
365 | ||
366 | module_init(cobalt_lcdfb_init); | |
367 | module_exit(cobalt_lcdfb_exit); | |
368 | ||
369 | MODULE_LICENSE("GPL v2"); | |
370 | MODULE_AUTHOR("Yoichi Yuasa"); | |
371 | MODULE_DESCRIPTION("Cobalt server LCD frame buffer driver"); |