1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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>
28#include <linux/module.h>
29
30
31
32
33
34
35
36
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
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
66#ifdef CONFIG_MIPS_COBALT
67static inline void lcd_write_control(struct fb_info *info, u8 control)
68{
69 writel((u32)control << 24, info->screen_base);
70}
71
72static inline u8 lcd_read_control(struct fb_info *info)
73{
74 return readl(info->screen_base) >> 24;
75}
76
77static 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
82static inline u8 lcd_read_data(struct fb_info *info)
83{
84 return readl(info->screen_base + LCD_DATA_REG_OFFSET) >> 24;
85}
86#else
87
88#define LCD_CTL 0x00
89#define LCD_DATA 0x08
90#define CPLD_STATUS 0x10
91#define CPLD_DATA 0x18
92
93static inline void cpld_wait(struct fb_info *info)
94{
95 do {
96 } while (readl(info->screen_base + CPLD_STATUS) & 1);
97}
98
99static 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
105static 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
113static 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
119static 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
127
128static 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
151static 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
170static struct fb_fix_screeninfo cobalt_lcdfb_fix = {
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
179static 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
225static 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
271static 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
291static 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
326static 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
334static int cobalt_lcdfb_probe(struct platform_device *dev)
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
350 info->screen_size = resource_size(res);
351 info->screen_base = devm_ioremap(&dev->dev, res->start,
352 info->screen_size);
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) {
363 framebuffer_release(info);
364 return retval;
365 }
366
367 platform_set_drvdata(dev, info);
368
369 lcd_clear(info);
370
371 fb_info(info, "Cobalt server LCD frame buffer device\n");
372
373 return 0;
374}
375
376static int cobalt_lcdfb_remove(struct platform_device *dev)
377{
378 struct fb_info *info;
379
380 info = platform_get_drvdata(dev);
381 if (info) {
382 unregister_framebuffer(info);
383 framebuffer_release(info);
384 }
385
386 return 0;
387}
388
389static struct platform_driver cobalt_lcdfb_driver = {
390 .probe = cobalt_lcdfb_probe,
391 .remove = cobalt_lcdfb_remove,
392 .driver = {
393 .name = "cobalt-lcd",
394 .owner = THIS_MODULE,
395 },
396};
397module_platform_driver(cobalt_lcdfb_driver);
398
399MODULE_LICENSE("GPL v2");
400MODULE_AUTHOR("Yoichi Yuasa");
401MODULE_DESCRIPTION("Cobalt server LCD frame buffer driver");
402
