Commit | Line | Data |
---|---|---|
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> |
5abe3b40 YY |
29 | |
30 | /* | |
31 | * Cursor position address | |
32 | * \X 0 1 2 ... 14 15 | |
33 | * Y+----+----+----+---+----+----+ | |
34 | * 0|0x00|0x01|0x02|...|0x0e|0x0f| | |
35 | * +----+----+----+---+----+----+ | |
36 | * 1|0x40|0x41|0x42|...|0x4e|0x4f| | |
37 | * +----+----+----+---+----+----+ | |
38 | */ | |
39 | #define LCD_DATA_REG_OFFSET 0x10 | |
40 | #define LCD_XRES_MAX 16 | |
41 | #define LCD_YRES_MAX 2 | |
42 | #define LCD_CHARS_MAX 32 | |
43 | ||
44 | #define LCD_CLEAR 0x01 | |
45 | #define LCD_CURSOR_MOVE_HOME 0x02 | |
46 | #define LCD_RESET 0x06 | |
47 | #define LCD_OFF 0x08 | |
48 | #define LCD_CURSOR_OFF 0x0c | |
49 | #define LCD_CURSOR_BLINK_OFF 0x0e | |
50 | #define LCD_CURSOR_ON 0x0f | |
51 | #define LCD_ON LCD_CURSOR_ON | |
52 | #define LCD_CURSOR_MOVE_LEFT 0x10 | |
53 | #define LCD_CURSOR_MOVE_RIGHT 0x14 | |
54 | #define LCD_DISPLAY_LEFT 0x18 | |
55 | #define LCD_DISPLAY_RIGHT 0x1c | |
56 | #define LCD_PRERESET 0x3f /* execute 4 times continuously */ | |
57 | #define LCD_BUSY 0x80 | |
58 | ||
59 | #define LCD_GRAPHIC_MODE 0x40 | |
60 | #define LCD_TEXT_MODE 0x80 | |
61 | #define LCD_CUR_POS_MASK 0x7f | |
62 | ||
63 | #define LCD_CUR_POS(x) ((x) & LCD_CUR_POS_MASK) | |
64 | #define LCD_TEXT_POS(x) ((x) | LCD_TEXT_MODE) | |
65 | ||
13f36e9e | 66 | #ifdef CONFIG_MIPS_COBALT |
5abe3b40 YY |
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 | } | |
13f36e9e SH |
86 | #else |
87 | ||
88 | #define LCD_CTL 0x00 | |
89 | #define LCD_DATA 0x08 | |
90 | #define CPLD_STATUS 0x10 | |
91 | #define CPLD_DATA 0x18 | |
92 | ||
93 | static inline void cpld_wait(struct fb_info *info) | |
94 | { | |
95 | do { | |
96 | } while (readl(info->screen_base + CPLD_STATUS) & 1); | |
97 | } | |
98 | ||
99 | static inline void lcd_write_control(struct fb_info *info, u8 control) | |
100 | { | |
101 | cpld_wait(info); | |
102 | writel(control, info->screen_base + LCD_CTL); | |
103 | } | |
104 | ||
105 | static inline u8 lcd_read_control(struct fb_info *info) | |
106 | { | |
107 | cpld_wait(info); | |
108 | readl(info->screen_base + LCD_CTL); | |
109 | cpld_wait(info); | |
110 | return readl(info->screen_base + CPLD_DATA) & 0xff; | |
111 | } | |
112 | ||
113 | static inline void lcd_write_data(struct fb_info *info, u8 data) | |
114 | { | |
115 | cpld_wait(info); | |
116 | writel(data, info->screen_base + LCD_DATA); | |
117 | } | |
118 | ||
119 | static inline u8 lcd_read_data(struct fb_info *info) | |
120 | { | |
121 | cpld_wait(info); | |
122 | readl(info->screen_base + LCD_DATA); | |
123 | cpld_wait(info); | |
124 | return readl(info->screen_base + CPLD_DATA) & 0xff; | |
125 | } | |
126 | #endif | |
5abe3b40 YY |
127 | |
128 | static int lcd_busy_wait(struct fb_info *info) | |
129 | { | |
130 | u8 val = 0; | |
131 | int timeout = 10, retval = 0; | |
132 | ||
133 | do { | |
134 | val = lcd_read_control(info); | |
135 | val &= LCD_BUSY; | |
136 | if (val != LCD_BUSY) | |
137 | break; | |
138 | ||
139 | if (msleep_interruptible(1)) | |
140 | return -EINTR; | |
141 | ||
142 | timeout--; | |
143 | } while (timeout); | |
144 | ||
145 | if (val == LCD_BUSY) | |
146 | retval = -EBUSY; | |
147 | ||
148 | return retval; | |
149 | } | |
150 | ||
151 | static void lcd_clear(struct fb_info *info) | |
152 | { | |
153 | int i; | |
154 | ||
155 | for (i = 0; i < 4; i++) { | |
156 | udelay(150); | |
157 | ||
158 | lcd_write_control(info, LCD_PRERESET); | |
159 | } | |
160 | ||
161 | udelay(150); | |
162 | ||
163 | lcd_write_control(info, LCD_CLEAR); | |
164 | ||
165 | udelay(150); | |
166 | ||
167 | lcd_write_control(info, LCD_RESET); | |
168 | } | |
169 | ||
48c68c4f | 170 | static struct fb_fix_screeninfo cobalt_lcdfb_fix = { |
5abe3b40 YY |
171 | .id = "cobalt-lcd", |
172 | .type = FB_TYPE_TEXT, | |
173 | .type_aux = FB_AUX_TEXT_MDA, | |
174 | .visual = FB_VISUAL_MONO01, | |
175 | .line_length = LCD_XRES_MAX, | |
176 | .accel = FB_ACCEL_NONE, | |
177 | }; | |
178 | ||
179 | static ssize_t cobalt_lcdfb_read(struct fb_info *info, char __user *buf, | |
180 | size_t count, loff_t *ppos) | |
181 | { | |
182 | char src[LCD_CHARS_MAX]; | |
183 | unsigned long pos; | |
184 | int len, retval = 0; | |
185 | ||
186 | pos = *ppos; | |
187 | if (pos >= LCD_CHARS_MAX || count == 0) | |
188 | return 0; | |
189 | ||
190 | if (count > LCD_CHARS_MAX) | |
191 | count = LCD_CHARS_MAX; | |
192 | ||
193 | if (pos + count > LCD_CHARS_MAX) | |
194 | count = LCD_CHARS_MAX - pos; | |
195 | ||
196 | for (len = 0; len < count; len++) { | |
197 | retval = lcd_busy_wait(info); | |
198 | if (retval < 0) | |
199 | break; | |
200 | ||
201 | lcd_write_control(info, LCD_TEXT_POS(pos)); | |
202 | ||
203 | retval = lcd_busy_wait(info); | |
204 | if (retval < 0) | |
205 | break; | |
206 | ||
207 | src[len] = lcd_read_data(info); | |
208 | if (pos == 0x0f) | |
209 | pos = 0x40; | |
210 | else | |
211 | pos++; | |
212 | } | |
213 | ||
214 | if (retval < 0 && signal_pending(current)) | |
215 | return -ERESTARTSYS; | |
216 | ||
217 | if (copy_to_user(buf, src, len)) | |
218 | return -EFAULT; | |
219 | ||
220 | *ppos += len; | |
221 | ||
222 | return len; | |
223 | } | |
224 | ||
225 | static ssize_t cobalt_lcdfb_write(struct fb_info *info, const char __user *buf, | |
226 | size_t count, loff_t *ppos) | |
227 | { | |
228 | char dst[LCD_CHARS_MAX]; | |
229 | unsigned long pos; | |
230 | int len, retval = 0; | |
231 | ||
232 | pos = *ppos; | |
233 | if (pos >= LCD_CHARS_MAX || count == 0) | |
234 | return 0; | |
235 | ||
236 | if (count > LCD_CHARS_MAX) | |
237 | count = LCD_CHARS_MAX; | |
238 | ||
239 | if (pos + count > LCD_CHARS_MAX) | |
240 | count = LCD_CHARS_MAX - pos; | |
241 | ||
242 | if (copy_from_user(dst, buf, count)) | |
243 | return -EFAULT; | |
244 | ||
245 | for (len = 0; len < count; len++) { | |
246 | retval = lcd_busy_wait(info); | |
247 | if (retval < 0) | |
248 | break; | |
249 | ||
250 | lcd_write_control(info, LCD_TEXT_POS(pos)); | |
251 | ||
252 | retval = lcd_busy_wait(info); | |
253 | if (retval < 0) | |
254 | break; | |
255 | ||
256 | lcd_write_data(info, dst[len]); | |
257 | if (pos == 0x0f) | |
258 | pos = 0x40; | |
259 | else | |
260 | pos++; | |
261 | } | |
262 | ||
263 | if (retval < 0 && signal_pending(current)) | |
264 | return -ERESTARTSYS; | |
265 | ||
266 | *ppos += len; | |
267 | ||
268 | return len; | |
269 | } | |
270 | ||
271 | static int cobalt_lcdfb_blank(int blank_mode, struct fb_info *info) | |
272 | { | |
273 | int retval; | |
274 | ||
275 | retval = lcd_busy_wait(info); | |
276 | if (retval < 0) | |
277 | return retval; | |
278 | ||
279 | switch (blank_mode) { | |
280 | case FB_BLANK_UNBLANK: | |
281 | lcd_write_control(info, LCD_ON); | |
282 | break; | |
283 | default: | |
284 | lcd_write_control(info, LCD_OFF); | |
285 | break; | |
286 | } | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static int cobalt_lcdfb_cursor(struct fb_info *info, struct fb_cursor *cursor) | |
292 | { | |
293 | u32 x, y; | |
294 | int retval; | |
295 | ||
296 | switch (cursor->set) { | |
297 | case FB_CUR_SETPOS: | |
298 | x = cursor->image.dx; | |
299 | y = cursor->image.dy; | |
300 | if (x >= LCD_XRES_MAX || y >= LCD_YRES_MAX) | |
301 | return -EINVAL; | |
302 | ||
303 | retval = lcd_busy_wait(info); | |
304 | if (retval < 0) | |
305 | return retval; | |
306 | ||
307 | lcd_write_control(info, | |
308 | LCD_TEXT_POS(info->fix.line_length * y + x)); | |
309 | break; | |
310 | default: | |
311 | return -EINVAL; | |
312 | } | |
313 | ||
314 | retval = lcd_busy_wait(info); | |
315 | if (retval < 0) | |
316 | return retval; | |
317 | ||
318 | if (cursor->enable) | |
319 | lcd_write_control(info, LCD_CURSOR_ON); | |
320 | else | |
321 | lcd_write_control(info, LCD_CURSOR_OFF); | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static struct fb_ops cobalt_lcd_fbops = { | |
327 | .owner = THIS_MODULE, | |
328 | .fb_read = cobalt_lcdfb_read, | |
329 | .fb_write = cobalt_lcdfb_write, | |
330 | .fb_blank = cobalt_lcdfb_blank, | |
331 | .fb_cursor = cobalt_lcdfb_cursor, | |
332 | }; | |
333 | ||
48c68c4f | 334 | static int cobalt_lcdfb_probe(struct platform_device *dev) |
5abe3b40 YY |
335 | { |
336 | struct fb_info *info; | |
337 | struct resource *res; | |
338 | int retval; | |
339 | ||
340 | info = framebuffer_alloc(0, &dev->dev); | |
341 | if (!info) | |
342 | return -ENOMEM; | |
343 | ||
344 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
345 | if (!res) { | |
346 | framebuffer_release(info); | |
347 | return -EBUSY; | |
348 | } | |
349 | ||
28f65c11 | 350 | info->screen_size = resource_size(res); |
d1bea502 DC |
351 | info->screen_base = devm_ioremap(&dev->dev, res->start, |
352 | info->screen_size); | |
5abe3b40 YY |
353 | info->fbops = &cobalt_lcd_fbops; |
354 | info->fix = cobalt_lcdfb_fix; | |
355 | info->fix.smem_start = res->start; | |
356 | info->fix.smem_len = info->screen_size; | |
357 | info->pseudo_palette = NULL; | |
358 | info->par = NULL; | |
359 | info->flags = FBINFO_DEFAULT; | |
360 | ||
361 | retval = register_framebuffer(info); | |
362 | if (retval < 0) { | |
5abe3b40 YY |
363 | framebuffer_release(info); |
364 | return retval; | |
365 | } | |
366 | ||
367 | platform_set_drvdata(dev, info); | |
368 | ||
369 | lcd_clear(info); | |
370 | ||
31b6780c | 371 | fb_info(info, "Cobalt server LCD frame buffer device\n"); |
5abe3b40 YY |
372 | |
373 | return 0; | |
374 | } | |
375 | ||
48c68c4f | 376 | static int cobalt_lcdfb_remove(struct platform_device *dev) |
5abe3b40 YY |
377 | { |
378 | struct fb_info *info; | |
379 | ||
380 | info = platform_get_drvdata(dev); | |
381 | if (info) { | |
5abe3b40 YY |
382 | unregister_framebuffer(info); |
383 | framebuffer_release(info); | |
384 | } | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static struct platform_driver cobalt_lcdfb_driver = { | |
390 | .probe = cobalt_lcdfb_probe, | |
48c68c4f | 391 | .remove = cobalt_lcdfb_remove, |
5abe3b40 YY |
392 | .driver = { |
393 | .name = "cobalt-lcd", | |
5abe3b40 YY |
394 | }, |
395 | }; | |
be75b5b5 | 396 | module_platform_driver(cobalt_lcdfb_driver); |
5abe3b40 YY |
397 | |
398 | MODULE_LICENSE("GPL v2"); | |
399 | MODULE_AUTHOR("Yoichi Yuasa"); | |
400 | MODULE_DESCRIPTION("Cobalt server LCD frame buffer driver"); |