blob: 30a8369757e7ceca4b2a82ef49c98f7f9cb05cf3 [file] [log] [blame]
Jaya Kumar1154ea72005-06-21 17:17:04 -07001/*
2 * linux/drivers/video/arcfb.c -- FB driver for Arc monochrome LCD board
3 *
4 * Copyright (C) 2005, Jaya Kumar <jayalk@intworks.biz>
5 * http://www.intworks.biz/arclcd
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
9 * more details.
10 *
11 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
12 *
13 * This driver was written to be used with the Arc LCD board. Arc uses a
14 * set of KS108 chips that control individual 64x64 LCD matrices. The board
15 * can be paneled in a variety of setups such as 2x1=128x64, 4x4=256x256 and
16 * so on. The interface between the board and the host is TTL based GPIO. The
17 * GPIO requirements are 8 writable data lines and 4+n lines for control. On a
18 * GPIO-less system, the board can be tested by connecting the respective sigs
19 * up to a parallel port connector. The driver requires the IO addresses for
20 * data and control GPIO at load time. It is unable to probe for the
21 * existence of the LCD so it must be told at load time whether it should
22 * be enabled or not.
23 *
24 * Todo:
25 * - testing with 4x4
26 * - testing with interrupt hw
27 *
28 * General notes:
29 * - User must set tuhold. It's in microseconds. According to the 108 spec,
30 * the hold time is supposed to be at least 1 microsecond.
31 * - User must set num_cols=x num_rows=y, eg: x=2 means 128
32 * - User must set arcfb_enable=1 to enable it
33 * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR
34 *
35 */
36
37#include <linux/module.h>
38#include <linux/kernel.h>
39#include <linux/errno.h>
40#include <linux/string.h>
41#include <linux/mm.h>
Jaya Kumar1154ea72005-06-21 17:17:04 -070042#include <linux/slab.h>
43#include <linux/vmalloc.h>
44#include <linux/delay.h>
45#include <linux/interrupt.h>
46#include <linux/fb.h>
47#include <linux/init.h>
48#include <linux/arcfb.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010049#include <linux/platform_device.h>
Jaya Kumar1154ea72005-06-21 17:17:04 -070050
51#include <asm/uaccess.h>
52
53#define floor8(a) (a&(~0x07))
54#define floorXres(a,xres) (a&(~(xres - 1)))
55#define iceil8(a) (((int)((a+7)/8))*8)
56#define ceil64(a) (a|0x3F)
57#define ceilXres(a,xres) (a|(xres - 1))
58
59/* ks108 chipset specific defines and code */
60
61#define KS_SET_DPY_START_LINE 0xC0
62#define KS_SET_PAGE_NUM 0xB8
63#define KS_SET_X 0x40
64#define KS_CEHI 0x01
65#define KS_CELO 0x00
66#define KS_SEL_CMD 0x08
67#define KS_SEL_DATA 0x00
68#define KS_DPY_ON 0x3F
69#define KS_DPY_OFF 0x3E
70#define KS_INTACK 0x40
71#define KS_CLRINT 0x02
72
73struct arcfb_par {
74 unsigned long dio_addr;
75 unsigned long cio_addr;
76 unsigned long c2io_addr;
77 atomic_t ref_count;
78 unsigned char cslut[9];
79 struct fb_info *info;
80 unsigned int irq;
81 spinlock_t lock;
82};
83
84static struct fb_fix_screeninfo arcfb_fix __initdata = {
85 .id = "arcfb",
86 .type = FB_TYPE_PACKED_PIXELS,
87 .visual = FB_VISUAL_MONO01,
88 .xpanstep = 0,
89 .ypanstep = 1,
90 .ywrapstep = 0,
91 .accel = FB_ACCEL_NONE,
92};
93
94static struct fb_var_screeninfo arcfb_var __initdata = {
95 .xres = 128,
96 .yres = 64,
97 .xres_virtual = 128,
98 .yres_virtual = 64,
99 .bits_per_pixel = 1,
100 .nonstd = 1,
101};
102
103static unsigned long num_cols;
104static unsigned long num_rows;
105static unsigned long dio_addr;
106static unsigned long cio_addr;
107static unsigned long c2io_addr;
108static unsigned long splashval;
109static unsigned long tuhold;
110static unsigned int nosplash;
111static unsigned int arcfb_enable;
112static unsigned int irq;
113
114static DECLARE_WAIT_QUEUE_HEAD(arcfb_waitq);
115
116static void ks108_writeb_ctl(struct arcfb_par *par,
117 unsigned int chipindex, unsigned char value)
118{
119 unsigned char chipselval = par->cslut[chipindex];
120
121 outb(chipselval|KS_CEHI|KS_SEL_CMD, par->cio_addr);
122 outb(value, par->dio_addr);
123 udelay(tuhold);
124 outb(chipselval|KS_CELO|KS_SEL_CMD, par->cio_addr);
125}
126
127static void ks108_writeb_mainctl(struct arcfb_par *par, unsigned char value)
128{
129
130 outb(value, par->cio_addr);
131 udelay(tuhold);
132}
133
134static unsigned char ks108_readb_ctl2(struct arcfb_par *par)
135{
136 return inb(par->c2io_addr);
137}
138
139static void ks108_writeb_data(struct arcfb_par *par,
140 unsigned int chipindex, unsigned char value)
141{
142 unsigned char chipselval = par->cslut[chipindex];
143
144 outb(chipselval|KS_CEHI|KS_SEL_DATA, par->cio_addr);
145 outb(value, par->dio_addr);
146 udelay(tuhold);
147 outb(chipselval|KS_CELO|KS_SEL_DATA, par->cio_addr);
148}
149
150static void ks108_set_start_line(struct arcfb_par *par,
151 unsigned int chipindex, unsigned char y)
152{
153 ks108_writeb_ctl(par, chipindex, KS_SET_DPY_START_LINE|y);
154}
155
156static void ks108_set_yaddr(struct arcfb_par *par,
157 unsigned int chipindex, unsigned char y)
158{
159 ks108_writeb_ctl(par, chipindex, KS_SET_PAGE_NUM|y);
160}
161
162static void ks108_set_xaddr(struct arcfb_par *par,
163 unsigned int chipindex, unsigned char x)
164{
165 ks108_writeb_ctl(par, chipindex, KS_SET_X|x);
166}
167
168static void ks108_clear_lcd(struct arcfb_par *par, unsigned int chipindex)
169{
170 int i,j;
171
172 for (i = 0; i <= 8; i++) {
173 ks108_set_yaddr(par, chipindex, i);
174 ks108_set_xaddr(par, chipindex, 0);
175 for (j = 0; j < 64; j++) {
176 ks108_writeb_data(par, chipindex,
177 (unsigned char) splashval);
178 }
179 }
180}
181
182/* main arcfb functions */
183
184static int arcfb_open(struct fb_info *info, int user)
185{
186 struct arcfb_par *par = info->par;
187
188 atomic_inc(&par->ref_count);
189 return 0;
190}
191
192static int arcfb_release(struct fb_info *info, int user)
193{
194 struct arcfb_par *par = info->par;
195 int count = atomic_read(&par->ref_count);
196
197 if (!count)
198 return -EINVAL;
199 atomic_dec(&par->ref_count);
200 return 0;
201}
202
203static int arcfb_pan_display(struct fb_var_screeninfo *var,
204 struct fb_info *info)
205{
206 int i;
207 struct arcfb_par *par = info->par;
208
209 if ((var->vmode & FB_VMODE_YWRAP) && (var->yoffset < 64)
210 && (info->var.yres <= 64)) {
211 for (i = 0; i < num_cols; i++) {
212 ks108_set_start_line(par, i, var->yoffset);
213 }
214 info->var.yoffset = var->yoffset;
215 return 0;
216 }
217
218 return -EINVAL;
219}
220
David Howells7d12e782006-10-05 14:55:46 +0100221static irqreturn_t arcfb_interrupt(int vec, void *dev_instance)
Jaya Kumar1154ea72005-06-21 17:17:04 -0700222{
223 struct fb_info *info = dev_instance;
224 unsigned char ctl2status;
225 struct arcfb_par *par = info->par;
226
227 ctl2status = ks108_readb_ctl2(par);
228
229 if (!(ctl2status & KS_INTACK)) /* not arc generated interrupt */
230 return IRQ_NONE;
231
232 ks108_writeb_mainctl(par, KS_CLRINT);
233
234 spin_lock(&par->lock);
235 if (waitqueue_active(&arcfb_waitq)) {
236 wake_up(&arcfb_waitq);
237 }
238 spin_unlock(&par->lock);
239
240 return IRQ_HANDLED;
241}
242
243/*
244 * here we handle a specific page on the lcd. the complexity comes from
245 * the fact that the fb is laidout in 8xX vertical columns. we extract
246 * each write of 8 vertical pixels. then we shift out as we move along
247 * X. That's what rightshift does. bitmask selects the desired input bit.
248 */
249static void arcfb_lcd_update_page(struct arcfb_par *par, unsigned int upper,
250 unsigned int left, unsigned int right, unsigned int distance)
251{
252 unsigned char *src;
253 unsigned int xindex, yindex, chipindex, linesize;
Antonino A. Daplas604cc992006-03-11 03:27:21 -0800254 int i;
Jaya Kumar1154ea72005-06-21 17:17:04 -0700255 unsigned char val;
256 unsigned char bitmask, rightshift;
257
258 xindex = left >> 6;
259 yindex = upper >> 6;
260 chipindex = (xindex + (yindex*num_cols));
261
262 ks108_set_yaddr(par, chipindex, upper/8);
263
264 linesize = par->info->var.xres/8;
265 src = par->info->screen_base + (left/8) + (upper * linesize);
266 ks108_set_xaddr(par, chipindex, left);
267
268 bitmask=1;
269 rightshift=0;
270 while (left <= right) {
271 val = 0;
272 for (i = 0; i < 8; i++) {
273 if ( i > rightshift) {
274 val |= (*(src + (i*linesize)) & bitmask)
275 << (i - rightshift);
276 } else {
277 val |= (*(src + (i*linesize)) & bitmask)
278 >> (rightshift - i);
279 }
280 }
281 ks108_writeb_data(par, chipindex, val);
282 left++;
Jaya Kumar1154ea72005-06-21 17:17:04 -0700283 if (bitmask == 0x80) {
284 bitmask = 1;
285 src++;
286 rightshift=0;
287 } else {
288 bitmask <<= 1;
289 rightshift++;
290 }
291 }
292}
293
294/*
295 * here we handle the entire vertical page of the update. we write across
296 * lcd chips. update_page uses the upper/left values to decide which
297 * chip to select for the right. upper is needed for setting the page
298 * desired for the write.
299 */
300static void arcfb_lcd_update_vert(struct arcfb_par *par, unsigned int top,
301 unsigned int bottom, unsigned int left, unsigned int right)
302{
303 unsigned int distance, upper, lower;
304
305 distance = (bottom - top) + 1;
306 upper = top;
307 lower = top + 7;
308
309 while (distance > 0) {
310 distance -= 8;
311 arcfb_lcd_update_page(par, upper, left, right, 8);
312 upper = lower + 1;
313 lower = upper + 7;
314 }
315}
316
317/*
318 * here we handle horizontal blocks for the update. update_vert will
319 * handle spaning multiple pages. we break out each horizontal
320 * block in to individual blocks no taller than 64 pixels.
321 */
322static void arcfb_lcd_update_horiz(struct arcfb_par *par, unsigned int left,
323 unsigned int right, unsigned int top, unsigned int h)
324{
325 unsigned int distance, upper, lower;
326
327 distance = h;
328 upper = floor8(top);
329 lower = min(upper + distance - 1, ceil64(upper));
330
331 while (distance > 0) {
332 distance -= ((lower - upper) + 1 );
333 arcfb_lcd_update_vert(par, upper, lower, left, right);
334 upper = lower + 1;
335 lower = min(upper + distance - 1, ceil64(upper));
336 }
337}
338
339/*
340 * here we start the process of spliting out the fb update into
341 * individual blocks of pixels. we end up spliting into 64x64 blocks
342 * and finally down to 64x8 pages.
343 */
344static void arcfb_lcd_update(struct arcfb_par *par, unsigned int dx,
345 unsigned int dy, unsigned int w, unsigned int h)
346{
347 unsigned int left, right, distance, y;
348
349 /* align the request first */
350 y = floor8(dy);
351 h += dy - y;
352 h = iceil8(h);
353
354 distance = w;
355 left = dx;
356 right = min(left + w - 1, ceil64(left));
357
358 while (distance > 0) {
359 arcfb_lcd_update_horiz(par, left, right, y, h);
360 distance -= ((right - left) + 1);
361 left = right + 1;
362 right = min(left + distance - 1, ceil64(left));
363 }
364}
365
Adrian Bunka0aa7d02006-01-09 20:54:04 -0800366static void arcfb_fillrect(struct fb_info *info,
367 const struct fb_fillrect *rect)
Jaya Kumar1154ea72005-06-21 17:17:04 -0700368{
369 struct arcfb_par *par = info->par;
370
371 cfb_fillrect(info, rect);
372
373 /* update the physical lcd */
374 arcfb_lcd_update(par, rect->dx, rect->dy, rect->width, rect->height);
375}
376
Adrian Bunka0aa7d02006-01-09 20:54:04 -0800377static void arcfb_copyarea(struct fb_info *info,
378 const struct fb_copyarea *area)
Jaya Kumar1154ea72005-06-21 17:17:04 -0700379{
380 struct arcfb_par *par = info->par;
381
382 cfb_copyarea(info, area);
383
384 /* update the physical lcd */
385 arcfb_lcd_update(par, area->dx, area->dy, area->width, area->height);
386}
387
Adrian Bunka0aa7d02006-01-09 20:54:04 -0800388static void arcfb_imageblit(struct fb_info *info, const struct fb_image *image)
Jaya Kumar1154ea72005-06-21 17:17:04 -0700389{
390 struct arcfb_par *par = info->par;
391
392 cfb_imageblit(info, image);
393
394 /* update the physical lcd */
395 arcfb_lcd_update(par, image->dx, image->dy, image->width,
396 image->height);
397}
398
Christoph Hellwig67a66802006-01-14 13:21:25 -0800399static int arcfb_ioctl(struct fb_info *info,
400 unsigned int cmd, unsigned long arg)
Jaya Kumar1154ea72005-06-21 17:17:04 -0700401{
402 void __user *argp = (void __user *)arg;
403 struct arcfb_par *par = info->par;
404 unsigned long flags;
405
406 switch (cmd) {
407 case FBIO_WAITEVENT:
408 {
409 DEFINE_WAIT(wait);
410 /* illegal to wait on arc if no irq will occur */
411 if (!par->irq)
412 return -EINVAL;
413
414 /* wait until the Arc has generated an interrupt
415 * which will wake us up */
416 spin_lock_irqsave(&par->lock, flags);
417 prepare_to_wait(&arcfb_waitq, &wait,
418 TASK_INTERRUPTIBLE);
419 spin_unlock_irqrestore(&par->lock, flags);
420 schedule();
421 finish_wait(&arcfb_waitq, &wait);
422 }
423 case FBIO_GETCONTROL2:
424 {
425 unsigned char ctl2;
426
427 ctl2 = ks108_readb_ctl2(info->par);
428 if (copy_to_user(argp, &ctl2, sizeof(ctl2)))
429 return -EFAULT;
430 return 0;
431 }
432 default:
433 return -EINVAL;
434 }
435}
436
437/*
438 * this is the access path from userspace. they can seek and write to
439 * the fb. it's inefficient for them to do anything less than 64*8
440 * writes since we update the lcd in each write() anyway.
441 */
Al Virod2204392005-12-15 09:18:15 +0000442static ssize_t arcfb_write(struct file *file, const char __user *buf, size_t count,
Jaya Kumar1154ea72005-06-21 17:17:04 -0700443 loff_t *ppos)
444{
445 /* modded from epson 1355 */
446
447 struct inode *inode;
448 int fbidx;
449 struct fb_info *info;
450 unsigned long p;
451 int err=-EINVAL;
452 unsigned int fbmemlength,x,y,w,h, bitppos, startpos, endpos, bitcount;
453 struct arcfb_par *par;
454 unsigned int xres;
455
456 p = *ppos;
Josef Sipekad9a8242006-12-08 02:37:48 -0800457 inode = file->f_path.dentry->d_inode;
Jaya Kumar1154ea72005-06-21 17:17:04 -0700458 fbidx = iminor(inode);
459 info = registered_fb[fbidx];
Jaya Kumar1154ea72005-06-21 17:17:04 -0700460
461 if (!info || !info->screen_base)
462 return -ENODEV;
463
Antonino A. Daplas939205b2006-03-11 03:27:23 -0800464 par = info->par;
Jaya Kumar1154ea72005-06-21 17:17:04 -0700465 xres = info->var.xres;
466 fbmemlength = (xres * info->var.yres)/8;
467
468 if (p > fbmemlength)
469 return -ENOSPC;
470
471 err = 0;
472 if ((count + p) > fbmemlength) {
473 count = fbmemlength - p;
474 err = -ENOSPC;
475 }
476
477 if (count) {
478 char *base_addr;
479
480 base_addr = info->screen_base;
481 count -= copy_from_user(base_addr + p, buf, count);
482 *ppos += count;
483 err = -EFAULT;
484 }
485
486
487 bitppos = p*8;
488 startpos = floorXres(bitppos, xres);
489 endpos = ceilXres((bitppos + (count*8)), xres);
490 bitcount = endpos - startpos;
491
492 x = startpos % xres;
493 y = startpos / xres;
494 w = xres;
495 h = bitcount / xres;
496 arcfb_lcd_update(par, x, y, w, h);
497
498 if (count)
499 return count;
500 return err;
501}
502
Jaya Kumar1154ea72005-06-21 17:17:04 -0700503static struct fb_ops arcfb_ops = {
504 .owner = THIS_MODULE,
505 .fb_open = arcfb_open,
506 .fb_write = arcfb_write,
507 .fb_release = arcfb_release,
508 .fb_pan_display = arcfb_pan_display,
509 .fb_fillrect = arcfb_fillrect,
510 .fb_copyarea = arcfb_copyarea,
511 .fb_imageblit = arcfb_imageblit,
Jaya Kumar1154ea72005-06-21 17:17:04 -0700512 .fb_ioctl = arcfb_ioctl,
513};
514
Russell King3ae5eae2005-11-09 22:32:44 +0000515static int __init arcfb_probe(struct platform_device *dev)
Jaya Kumar1154ea72005-06-21 17:17:04 -0700516{
Jaya Kumar1154ea72005-06-21 17:17:04 -0700517 struct fb_info *info;
518 int retval = -ENOMEM;
519 int videomemorysize;
520 unsigned char *videomemory;
521 struct arcfb_par *par;
522 int i;
523
524 videomemorysize = (((64*64)*num_cols)*num_rows)/8;
525
526 /* We need a flat backing store for the Arc's
527 less-flat actual paged framebuffer */
528 if (!(videomemory = vmalloc(videomemorysize)))
529 return retval;
530
531 memset(videomemory, 0, videomemorysize);
532
533 info = framebuffer_alloc(sizeof(struct arcfb_par), &dev->dev);
534 if (!info)
535 goto err;
536
537 info->screen_base = (char __iomem *)videomemory;
538 info->fbops = &arcfb_ops;
539
540 info->var = arcfb_var;
541 info->fix = arcfb_fix;
542 par = info->par;
543 par->info = info;
544
545 if (!dio_addr || !cio_addr || !c2io_addr) {
546 printk(KERN_WARNING "no IO addresses supplied\n");
547 goto err1;
548 }
549 par->dio_addr = dio_addr;
550 par->cio_addr = cio_addr;
551 par->c2io_addr = c2io_addr;
552 par->cslut[0] = 0x00;
553 par->cslut[1] = 0x06;
554 info->flags = FBINFO_FLAG_DEFAULT;
555 spin_lock_init(&par->lock);
556 retval = register_framebuffer(info);
557 if (retval < 0)
558 goto err1;
Russell King3ae5eae2005-11-09 22:32:44 +0000559 platform_set_drvdata(dev, info);
Jaya Kumar1154ea72005-06-21 17:17:04 -0700560 if (irq) {
561 par->irq = irq;
Thomas Gleixner63a43392006-07-01 19:29:45 -0700562 if (request_irq(par->irq, &arcfb_interrupt, IRQF_SHARED,
Jaya Kumar1154ea72005-06-21 17:17:04 -0700563 "arcfb", info)) {
564 printk(KERN_INFO
565 "arcfb: Failed req IRQ %d\n", par->irq);
566 goto err1;
567 }
568 }
569 printk(KERN_INFO
570 "fb%d: Arc frame buffer device, using %dK of video memory\n",
571 info->node, videomemorysize >> 10);
572
573 /* this inits the lcd but doesn't clear dirty pixels */
574 for (i = 0; i < num_cols * num_rows; i++) {
575 ks108_writeb_ctl(par, i, KS_DPY_OFF);
576 ks108_set_start_line(par, i, 0);
577 ks108_set_yaddr(par, i, 0);
578 ks108_set_xaddr(par, i, 0);
579 ks108_writeb_ctl(par, i, KS_DPY_ON);
580 }
581
582 /* if we were told to splash the screen, we just clear it */
583 if (!nosplash) {
584 for (i = 0; i < num_cols * num_rows; i++) {
585 printk(KERN_INFO "fb%d: splashing lcd %d\n",
586 info->node, i);
587 ks108_set_start_line(par, i, 0);
588 ks108_clear_lcd(par, i);
589 }
590 }
591
592 return 0;
593err1:
594 framebuffer_release(info);
595err:
596 vfree(videomemory);
597 return retval;
598}
599
Russell King3ae5eae2005-11-09 22:32:44 +0000600static int arcfb_remove(struct platform_device *dev)
Jaya Kumar1154ea72005-06-21 17:17:04 -0700601{
Russell King3ae5eae2005-11-09 22:32:44 +0000602 struct fb_info *info = platform_get_drvdata(dev);
Jaya Kumar1154ea72005-06-21 17:17:04 -0700603
604 if (info) {
605 unregister_framebuffer(info);
606 vfree(info->screen_base);
607 framebuffer_release(info);
608 }
609 return 0;
610}
611
Russell King3ae5eae2005-11-09 22:32:44 +0000612static struct platform_driver arcfb_driver = {
Jaya Kumar1154ea72005-06-21 17:17:04 -0700613 .probe = arcfb_probe,
614 .remove = arcfb_remove,
Russell King3ae5eae2005-11-09 22:32:44 +0000615 .driver = {
616 .name = "arcfb",
617 },
Jaya Kumar1154ea72005-06-21 17:17:04 -0700618};
619
Russell King8d972a92005-11-05 21:21:38 +0000620static struct platform_device *arcfb_device;
Jaya Kumar1154ea72005-06-21 17:17:04 -0700621
622static int __init arcfb_init(void)
623{
624 int ret;
625
626 if (!arcfb_enable)
627 return -ENXIO;
628
Russell King3ae5eae2005-11-09 22:32:44 +0000629 ret = platform_driver_register(&arcfb_driver);
Jaya Kumar1154ea72005-06-21 17:17:04 -0700630 if (!ret) {
Russell King8d972a92005-11-05 21:21:38 +0000631 arcfb_device = platform_device_alloc("arcfb", 0);
632 if (arcfb_device) {
633 ret = platform_device_add(arcfb_device);
634 } else {
635 ret = -ENOMEM;
636 }
637 if (ret) {
638 platform_device_put(arcfb_device);
Russell King3ae5eae2005-11-09 22:32:44 +0000639 platform_driver_unregister(&arcfb_driver);
Russell King8d972a92005-11-05 21:21:38 +0000640 }
Jaya Kumar1154ea72005-06-21 17:17:04 -0700641 }
642 return ret;
643
644}
645
646static void __exit arcfb_exit(void)
647{
Russell King8d972a92005-11-05 21:21:38 +0000648 platform_device_unregister(arcfb_device);
Russell King3ae5eae2005-11-09 22:32:44 +0000649 platform_driver_unregister(&arcfb_driver);
Jaya Kumar1154ea72005-06-21 17:17:04 -0700650}
651
652module_param(num_cols, ulong, 0);
653MODULE_PARM_DESC(num_cols, "Num horiz panels, eg: 2 = 128 bit wide");
654module_param(num_rows, ulong, 0);
655MODULE_PARM_DESC(num_rows, "Num vert panels, eg: 1 = 64 bit high");
656module_param(nosplash, uint, 0);
657MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
658module_param(arcfb_enable, uint, 0);
659MODULE_PARM_DESC(arcfb_enable, "Enable communication with Arc board");
660module_param(dio_addr, ulong, 0);
661MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");
662module_param(cio_addr, ulong, 0);
663MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");
664module_param(c2io_addr, ulong, 0);
665MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408");
666module_param(splashval, ulong, 0);
667MODULE_PARM_DESC(splashval, "Splash pattern: 0xFF is black, 0x00 is green");
668module_param(tuhold, ulong, 0);
669MODULE_PARM_DESC(tuhold, "Time to hold between strobing data to Arc board");
670module_param(irq, uint, 0);
671MODULE_PARM_DESC(irq, "IRQ for the Arc board");
672
673module_init(arcfb_init);
674module_exit(arcfb_exit);
675
676MODULE_DESCRIPTION("fbdev driver for Arc monochrome LCD board");
677MODULE_AUTHOR("Jaya Kumar");
678MODULE_LICENSE("GPL");
679