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> | |
355b200b | 27 | #include <linux/module.h> |
5abe3b40 YY |
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 | ||
7d7fb0e6 | 127 | static struct fb_fix_screeninfo cobalt_lcdfb_fix __devinitdata = { |
5abe3b40 YY |
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 | ||
c2e13037 | 291 | static int __devinit cobalt_lcdfb_probe(struct platform_device *dev) |
5abe3b40 YY |
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 | ||
28f65c11 | 307 | info->screen_size = resource_size(res); |
5abe3b40 YY |
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"); |