Commit | Line | Data |
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5abe3b40 | 1 | /* |
13f36e9e | 2 | * Cobalt/SEAD3 LCD frame buffer driver. |
5abe3b40 | 3 | * |
ada8e951 | 4 | * Copyright (C) 2008 Yoichi Yuasa <yuasa@linux-mips.org> |
13f36e9e | 5 | * Copyright (C) 2012 MIPS Technologies, Inc. |
5abe3b40 YY |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | #include <linux/delay.h> | |
22 | #include <linux/fb.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/io.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/uaccess.h> | |
27 | #include <linux/platform_device.h> | |
355b200b | 28 | #include <linux/module.h> |
174cd4b1 | 29 | #include <linux/sched/signal.h> |
5abe3b40 YY |
30 | |
31 | /* | |
32 | * Cursor position address | |
33 | * \X 0 1 2 ... 14 15 | |
34 | * Y+----+----+----+---+----+----+ | |
35 | * 0|0x00|0x01|0x02|...|0x0e|0x0f| | |
36 | * +----+----+----+---+----+----+ | |
37 | * 1|0x40|0x41|0x42|...|0x4e|0x4f| | |
38 | * +----+----+----+---+----+----+ | |
39 | */ | |
40 | #define LCD_DATA_REG_OFFSET 0x10 | |
41 | #define LCD_XRES_MAX 16 | |
42 | #define LCD_YRES_MAX 2 | |
43 | #define LCD_CHARS_MAX 32 | |
44 | ||
45 | #define LCD_CLEAR 0x01 | |
46 | #define LCD_CURSOR_MOVE_HOME 0x02 | |
47 | #define LCD_RESET 0x06 | |
48 | #define LCD_OFF 0x08 | |
49 | #define LCD_CURSOR_OFF 0x0c | |
50 | #define LCD_CURSOR_BLINK_OFF 0x0e | |
51 | #define LCD_CURSOR_ON 0x0f | |
52 | #define LCD_ON LCD_CURSOR_ON | |
53 | #define LCD_CURSOR_MOVE_LEFT 0x10 | |
54 | #define LCD_CURSOR_MOVE_RIGHT 0x14 | |
55 | #define LCD_DISPLAY_LEFT 0x18 | |
56 | #define LCD_DISPLAY_RIGHT 0x1c | |
57 | #define LCD_PRERESET 0x3f /* execute 4 times continuously */ | |
58 | #define LCD_BUSY 0x80 | |
59 | ||
60 | #define LCD_GRAPHIC_MODE 0x40 | |
61 | #define LCD_TEXT_MODE 0x80 | |
62 | #define LCD_CUR_POS_MASK 0x7f | |
63 | ||
64 | #define LCD_CUR_POS(x) ((x) & LCD_CUR_POS_MASK) | |
65 | #define LCD_TEXT_POS(x) ((x) | LCD_TEXT_MODE) | |
66 | ||
67 | static inline void lcd_write_control(struct fb_info *info, u8 control) | |
68 | { | |
69 | writel((u32)control << 24, info->screen_base); | |
70 | } | |
71 | ||
72 | static inline u8 lcd_read_control(struct fb_info *info) | |
73 | { | |
74 | return readl(info->screen_base) >> 24; | |
75 | } | |
76 | ||
77 | static inline void lcd_write_data(struct fb_info *info, u8 data) | |
78 | { | |
79 | writel((u32)data << 24, info->screen_base + LCD_DATA_REG_OFFSET); | |
80 | } | |
81 | ||
82 | static inline u8 lcd_read_data(struct fb_info *info) | |
83 | { | |
84 | return readl(info->screen_base + LCD_DATA_REG_OFFSET) >> 24; | |
85 | } | |
86 | ||
87 | static int lcd_busy_wait(struct fb_info *info) | |
88 | { | |
89 | u8 val = 0; | |
90 | int timeout = 10, retval = 0; | |
91 | ||
92 | do { | |
93 | val = lcd_read_control(info); | |
94 | val &= LCD_BUSY; | |
95 | if (val != LCD_BUSY) | |
96 | break; | |
97 | ||
98 | if (msleep_interruptible(1)) | |
99 | return -EINTR; | |
100 | ||
101 | timeout--; | |
102 | } while (timeout); | |
103 | ||
104 | if (val == LCD_BUSY) | |
105 | retval = -EBUSY; | |
106 | ||
107 | return retval; | |
108 | } | |
109 | ||
110 | static void lcd_clear(struct fb_info *info) | |
111 | { | |
112 | int i; | |
113 | ||
114 | for (i = 0; i < 4; i++) { | |
115 | udelay(150); | |
116 | ||
117 | lcd_write_control(info, LCD_PRERESET); | |
118 | } | |
119 | ||
120 | udelay(150); | |
121 | ||
122 | lcd_write_control(info, LCD_CLEAR); | |
123 | ||
124 | udelay(150); | |
125 | ||
126 | lcd_write_control(info, LCD_RESET); | |
127 | } | |
128 | ||
c9742729 | 129 | static const struct fb_fix_screeninfo cobalt_lcdfb_fix = { |
5abe3b40 YY |
130 | .id = "cobalt-lcd", |
131 | .type = FB_TYPE_TEXT, | |
132 | .type_aux = FB_AUX_TEXT_MDA, | |
133 | .visual = FB_VISUAL_MONO01, | |
134 | .line_length = LCD_XRES_MAX, | |
135 | .accel = FB_ACCEL_NONE, | |
136 | }; | |
137 | ||
138 | static ssize_t cobalt_lcdfb_read(struct fb_info *info, char __user *buf, | |
139 | size_t count, loff_t *ppos) | |
140 | { | |
141 | char src[LCD_CHARS_MAX]; | |
142 | unsigned long pos; | |
143 | int len, retval = 0; | |
144 | ||
145 | pos = *ppos; | |
146 | if (pos >= LCD_CHARS_MAX || count == 0) | |
147 | return 0; | |
148 | ||
149 | if (count > LCD_CHARS_MAX) | |
150 | count = LCD_CHARS_MAX; | |
151 | ||
152 | if (pos + count > LCD_CHARS_MAX) | |
153 | count = LCD_CHARS_MAX - pos; | |
154 | ||
155 | for (len = 0; len < count; len++) { | |
156 | retval = lcd_busy_wait(info); | |
157 | if (retval < 0) | |
158 | break; | |
159 | ||
160 | lcd_write_control(info, LCD_TEXT_POS(pos)); | |
161 | ||
162 | retval = lcd_busy_wait(info); | |
163 | if (retval < 0) | |
164 | break; | |
165 | ||
166 | src[len] = lcd_read_data(info); | |
167 | if (pos == 0x0f) | |
168 | pos = 0x40; | |
169 | else | |
170 | pos++; | |
171 | } | |
172 | ||
173 | if (retval < 0 && signal_pending(current)) | |
174 | return -ERESTARTSYS; | |
175 | ||
176 | if (copy_to_user(buf, src, len)) | |
177 | return -EFAULT; | |
178 | ||
179 | *ppos += len; | |
180 | ||
181 | return len; | |
182 | } | |
183 | ||
184 | static ssize_t cobalt_lcdfb_write(struct fb_info *info, const char __user *buf, | |
185 | size_t count, loff_t *ppos) | |
186 | { | |
187 | char dst[LCD_CHARS_MAX]; | |
188 | unsigned long pos; | |
189 | int len, retval = 0; | |
190 | ||
191 | pos = *ppos; | |
192 | if (pos >= LCD_CHARS_MAX || count == 0) | |
193 | return 0; | |
194 | ||
195 | if (count > LCD_CHARS_MAX) | |
196 | count = LCD_CHARS_MAX; | |
197 | ||
198 | if (pos + count > LCD_CHARS_MAX) | |
199 | count = LCD_CHARS_MAX - pos; | |
200 | ||
201 | if (copy_from_user(dst, buf, count)) | |
202 | return -EFAULT; | |
203 | ||
204 | for (len = 0; len < count; len++) { | |
205 | retval = lcd_busy_wait(info); | |
206 | if (retval < 0) | |
207 | break; | |
208 | ||
209 | lcd_write_control(info, LCD_TEXT_POS(pos)); | |
210 | ||
211 | retval = lcd_busy_wait(info); | |
212 | if (retval < 0) | |
213 | break; | |
214 | ||
215 | lcd_write_data(info, dst[len]); | |
216 | if (pos == 0x0f) | |
217 | pos = 0x40; | |
218 | else | |
219 | pos++; | |
220 | } | |
221 | ||
222 | if (retval < 0 && signal_pending(current)) | |
223 | return -ERESTARTSYS; | |
224 | ||
225 | *ppos += len; | |
226 | ||
227 | return len; | |
228 | } | |
229 | ||
230 | static int cobalt_lcdfb_blank(int blank_mode, struct fb_info *info) | |
231 | { | |
232 | int retval; | |
233 | ||
234 | retval = lcd_busy_wait(info); | |
235 | if (retval < 0) | |
236 | return retval; | |
237 | ||
238 | switch (blank_mode) { | |
239 | case FB_BLANK_UNBLANK: | |
240 | lcd_write_control(info, LCD_ON); | |
241 | break; | |
242 | default: | |
243 | lcd_write_control(info, LCD_OFF); | |
244 | break; | |
245 | } | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | static int cobalt_lcdfb_cursor(struct fb_info *info, struct fb_cursor *cursor) | |
251 | { | |
252 | u32 x, y; | |
253 | int retval; | |
254 | ||
255 | switch (cursor->set) { | |
256 | case FB_CUR_SETPOS: | |
257 | x = cursor->image.dx; | |
258 | y = cursor->image.dy; | |
259 | if (x >= LCD_XRES_MAX || y >= LCD_YRES_MAX) | |
260 | return -EINVAL; | |
261 | ||
262 | retval = lcd_busy_wait(info); | |
263 | if (retval < 0) | |
264 | return retval; | |
265 | ||
266 | lcd_write_control(info, | |
267 | LCD_TEXT_POS(info->fix.line_length * y + x)); | |
268 | break; | |
269 | default: | |
270 | return -EINVAL; | |
271 | } | |
272 | ||
273 | retval = lcd_busy_wait(info); | |
274 | if (retval < 0) | |
275 | return retval; | |
276 | ||
277 | if (cursor->enable) | |
278 | lcd_write_control(info, LCD_CURSOR_ON); | |
279 | else | |
280 | lcd_write_control(info, LCD_CURSOR_OFF); | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static struct fb_ops cobalt_lcd_fbops = { | |
286 | .owner = THIS_MODULE, | |
287 | .fb_read = cobalt_lcdfb_read, | |
288 | .fb_write = cobalt_lcdfb_write, | |
289 | .fb_blank = cobalt_lcdfb_blank, | |
290 | .fb_cursor = cobalt_lcdfb_cursor, | |
291 | }; | |
292 | ||
48c68c4f | 293 | static int cobalt_lcdfb_probe(struct platform_device *dev) |
5abe3b40 YY |
294 | { |
295 | struct fb_info *info; | |
296 | struct resource *res; | |
297 | int retval; | |
298 | ||
299 | info = framebuffer_alloc(0, &dev->dev); | |
300 | if (!info) | |
301 | return -ENOMEM; | |
302 | ||
303 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
304 | if (!res) { | |
305 | framebuffer_release(info); | |
306 | return -EBUSY; | |
307 | } | |
308 | ||
28f65c11 | 309 | info->screen_size = resource_size(res); |
d1bea502 DC |
310 | info->screen_base = devm_ioremap(&dev->dev, res->start, |
311 | info->screen_size); | |
4dcd19bf AY |
312 | if (!info->screen_base) { |
313 | framebuffer_release(info); | |
314 | return -ENOMEM; | |
315 | } | |
316 | ||
5abe3b40 YY |
317 | info->fbops = &cobalt_lcd_fbops; |
318 | info->fix = cobalt_lcdfb_fix; | |
319 | info->fix.smem_start = res->start; | |
320 | info->fix.smem_len = info->screen_size; | |
321 | info->pseudo_palette = NULL; | |
322 | info->par = NULL; | |
323 | info->flags = FBINFO_DEFAULT; | |
324 | ||
325 | retval = register_framebuffer(info); | |
326 | if (retval < 0) { | |
5abe3b40 YY |
327 | framebuffer_release(info); |
328 | return retval; | |
329 | } | |
330 | ||
331 | platform_set_drvdata(dev, info); | |
332 | ||
333 | lcd_clear(info); | |
334 | ||
31b6780c | 335 | fb_info(info, "Cobalt server LCD frame buffer device\n"); |
5abe3b40 YY |
336 | |
337 | return 0; | |
338 | } | |
339 | ||
48c68c4f | 340 | static int cobalt_lcdfb_remove(struct platform_device *dev) |
5abe3b40 YY |
341 | { |
342 | struct fb_info *info; | |
343 | ||
344 | info = platform_get_drvdata(dev); | |
345 | if (info) { | |
5abe3b40 YY |
346 | unregister_framebuffer(info); |
347 | framebuffer_release(info); | |
348 | } | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | static struct platform_driver cobalt_lcdfb_driver = { | |
354 | .probe = cobalt_lcdfb_probe, | |
48c68c4f | 355 | .remove = cobalt_lcdfb_remove, |
5abe3b40 YY |
356 | .driver = { |
357 | .name = "cobalt-lcd", | |
5abe3b40 YY |
358 | }, |
359 | }; | |
be75b5b5 | 360 | module_platform_driver(cobalt_lcdfb_driver); |
5abe3b40 YY |
361 | |
362 | MODULE_LICENSE("GPL v2"); | |
363 | MODULE_AUTHOR("Yoichi Yuasa"); | |
364 | MODULE_DESCRIPTION("Cobalt server LCD frame buffer driver"); |