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Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[zen-stable.git] / drivers / video / smscufx.c
blobaaccffac67ab2fa50be66f0938b644864c640000
1 /*
2 * smscufx.c -- Framebuffer driver for SMSC UFX USB controller
3 *
4 * Copyright (C) 2011 Steve Glendinning <steve.glendinning@smsc.com>
5 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
6 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
7 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License v2. See the file COPYING in the main directory of this archive for
11 * more details.
12 *
13 * Based on udlfb, with work from Florian Echtler, Henrik Bjerregaard Pedersen,
14 * and others.
15 *
16 * Works well with Bernie Thompson's X DAMAGE patch to xf86-video-fbdev
17 * available from http://git.plugable.com
18 *
19 * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
20 * usb-skeleton by GregKH.
21 */
22
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/usb.h>
29 #include <linux/uaccess.h>
30 #include <linux/mm.h>
31 #include <linux/fb.h>
32 #include <linux/vmalloc.h>
33 #include <linux/slab.h>
34 #include <linux/delay.h>
35 #include "edid.h"
36
37 #define check_warn(status, fmt, args...) \
38 ({ if (status < 0) pr_warn(fmt, ##args); })
39
40 #define check_warn_return(status, fmt, args...) \
41 ({ if (status < 0) { pr_warn(fmt, ##args); return status; } })
42
43 #define check_warn_goto_error(status, fmt, args...) \
44 ({ if (status < 0) { pr_warn(fmt, ##args); goto error; } })
45
46 #define all_bits_set(x, bits) (((x) & (bits)) == (bits))
47
48 #define USB_VENDOR_REQUEST_WRITE_REGISTER 0xA0
49 #define USB_VENDOR_REQUEST_READ_REGISTER 0xA1
50
51 /*
52 * TODO: Propose standard fb.h ioctl for reporting damage,
53 * using _IOWR() and one of the existing area structs from fb.h
54 * Consider these ioctls deprecated, but they're still used by the
55 * DisplayLink X server as yet - need both to be modified in tandem
56 * when new ioctl(s) are ready.
57 */
58 #define UFX_IOCTL_RETURN_EDID (0xAD)
59 #define UFX_IOCTL_REPORT_DAMAGE (0xAA)
60
61 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
62 #define BULK_SIZE (512)
63 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
64 #define WRITES_IN_FLIGHT (4)
65
66 #define GET_URB_TIMEOUT (HZ)
67 #define FREE_URB_TIMEOUT (HZ*2)
68
69 #define BPP 2
70
71 #define UFX_DEFIO_WRITE_DELAY 5 /* fb_deferred_io.delay in jiffies */
72 #define UFX_DEFIO_WRITE_DISABLE (HZ*60) /* "disable" with long delay */
73
74 struct dloarea {
75 int x, y;
76 int w, h;
77 };
78
79 struct urb_node {
80 struct list_head entry;
81 struct ufx_data *dev;
82 struct delayed_work release_urb_work;
83 struct urb *urb;
84 };
85
86 struct urb_list {
87 struct list_head list;
88 spinlock_t lock;
89 struct semaphore limit_sem;
90 int available;
91 int count;
92 size_t size;
93 };
94
95 struct ufx_data {
96 struct usb_device *udev;
97 struct device *gdev; /* &udev->dev */
98 struct fb_info *info;
99 struct urb_list urbs;
100 struct kref kref;
101 int fb_count;
102 bool virtualized; /* true when physical usb device not present */
103 struct delayed_work free_framebuffer_work;
104 atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */
105 atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
106 u8 *edid; /* null until we read edid from hw or get from sysfs */
107 size_t edid_size;
108 u32 pseudo_palette[256];
109 };
110
111 static struct fb_fix_screeninfo ufx_fix = {
112 .id = "smscufx",
113 .type = FB_TYPE_PACKED_PIXELS,
114 .visual = FB_VISUAL_TRUECOLOR,
115 .xpanstep = 0,
116 .ypanstep = 0,
117 .ywrapstep = 0,
118 .accel = FB_ACCEL_NONE,
119 };
120
121 static const u32 smscufx_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
122 FBINFO_VIRTFB | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
123 FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
124
125 static struct usb_device_id id_table[] = {
126 {USB_DEVICE(0x0424, 0x9d00),},
127 {USB_DEVICE(0x0424, 0x9d01),},
128 {},
129 };
130 MODULE_DEVICE_TABLE(usb, id_table);
131
132 /* module options */
133 static int console; /* Optionally allow fbcon to consume first framebuffer */
134 static int fb_defio = true; /* Optionally enable fb_defio mmap support */
135
136 /* ufx keeps a list of urbs for efficient bulk transfers */
137 static void ufx_urb_completion(struct urb *urb);
138 static struct urb *ufx_get_urb(struct ufx_data *dev);
139 static int ufx_submit_urb(struct ufx_data *dev, struct urb * urb, size_t len);
140 static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size);
141 static void ufx_free_urb_list(struct ufx_data *dev);
142
143 /* reads a control register */
144 static int ufx_reg_read(struct ufx_data *dev, u32 index, u32 *data)
145 {
146 u32 *buf = kmalloc(4, GFP_KERNEL);
147 int ret;
148
149 BUG_ON(!dev);
150
151 if (!buf)
152 return -ENOMEM;
153
154 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
155 USB_VENDOR_REQUEST_READ_REGISTER,
156 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
157 00, index, buf, 4, USB_CTRL_GET_TIMEOUT);
158
159 le32_to_cpus(buf);
160 *data = *buf;
161 kfree(buf);
162
163 if (unlikely(ret < 0))
164 pr_warn("Failed to read register index 0x%08x\n", index);
165
166 return ret;
167 }
168
169 /* writes a control register */
170 static int ufx_reg_write(struct ufx_data *dev, u32 index, u32 data)
171 {
172 u32 *buf = kmalloc(4, GFP_KERNEL);
173 int ret;
174
175 BUG_ON(!dev);
176
177 if (!buf)
178 return -ENOMEM;
179
180 *buf = data;
181 cpu_to_le32s(buf);
182
183 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
184 USB_VENDOR_REQUEST_WRITE_REGISTER,
185 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
186 00, index, buf, 4, USB_CTRL_SET_TIMEOUT);
187
188 kfree(buf);
189
190 if (unlikely(ret < 0))
191 pr_warn("Failed to write register index 0x%08x with value "
192 "0x%08x\n", index, data);
193
194 return ret;
195 }
196
197 static int ufx_reg_clear_and_set_bits(struct ufx_data *dev, u32 index,
198 u32 bits_to_clear, u32 bits_to_set)
199 {
200 u32 data;
201 int status = ufx_reg_read(dev, index, &data);
202 check_warn_return(status, "ufx_reg_clear_and_set_bits error reading "
203 "0x%x", index);
204
205 data &= (~bits_to_clear);
206 data |= bits_to_set;
207
208 status = ufx_reg_write(dev, index, data);
209 check_warn_return(status, "ufx_reg_clear_and_set_bits error writing "
210 "0x%x", index);
211
212 return 0;
213 }
214
215 static int ufx_reg_set_bits(struct ufx_data *dev, u32 index, u32 bits)
216 {
217 return ufx_reg_clear_and_set_bits(dev, index, 0, bits);
218 }
219
220 static int ufx_reg_clear_bits(struct ufx_data *dev, u32 index, u32 bits)
221 {
222 return ufx_reg_clear_and_set_bits(dev, index, bits, 0);
223 }
224
225 static int ufx_lite_reset(struct ufx_data *dev)
226 {
227 int status;
228 u32 value;
229
230 status = ufx_reg_write(dev, 0x3008, 0x00000001);
231 check_warn_return(status, "ufx_lite_reset error writing 0x3008");
232
233 status = ufx_reg_read(dev, 0x3008, &value);
234 check_warn_return(status, "ufx_lite_reset error reading 0x3008");
235
236 return (value == 0) ? 0 : -EIO;
237 }
238
239 /* If display is unblanked, then blank it */
240 static int ufx_blank(struct ufx_data *dev, bool wait)
241 {
242 u32 dc_ctrl, dc_sts;
243 int i;
244
245 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
246 check_warn_return(status, "ufx_blank error reading 0x2004");
247
248 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
249 check_warn_return(status, "ufx_blank error reading 0x2000");
250
251 /* return success if display is already blanked */
252 if ((dc_sts & 0x00000100) || (dc_ctrl & 0x00000100))
253 return 0;
254
255 /* request the DC to blank the display */
256 dc_ctrl |= 0x00000100;
257 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
258 check_warn_return(status, "ufx_blank error writing 0x2000");
259
260 /* return success immediately if we don't have to wait */
261 if (!wait)
262 return 0;
263
264 for (i = 0; i < 250; i++) {
265 status = ufx_reg_read(dev, 0x2004, &dc_sts);
266 check_warn_return(status, "ufx_blank error reading 0x2004");
267
268 if (dc_sts & 0x00000100)
269 return 0;
270 }
271
272 /* timed out waiting for display to blank */
273 return -EIO;
274 }
275
276 /* If display is blanked, then unblank it */
277 static int ufx_unblank(struct ufx_data *dev, bool wait)
278 {
279 u32 dc_ctrl, dc_sts;
280 int i;
281
282 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
283 check_warn_return(status, "ufx_unblank error reading 0x2004");
284
285 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
286 check_warn_return(status, "ufx_unblank error reading 0x2000");
287
288 /* return success if display is already unblanked */
289 if (((dc_sts & 0x00000100) == 0) || ((dc_ctrl & 0x00000100) == 0))
290 return 0;
291
292 /* request the DC to unblank the display */
293 dc_ctrl &= ~0x00000100;
294 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
295 check_warn_return(status, "ufx_unblank error writing 0x2000");
296
297 /* return success immediately if we don't have to wait */
298 if (!wait)
299 return 0;
300
301 for (i = 0; i < 250; i++) {
302 status = ufx_reg_read(dev, 0x2004, &dc_sts);
303 check_warn_return(status, "ufx_unblank error reading 0x2004");
304
305 if ((dc_sts & 0x00000100) == 0)
306 return 0;
307 }
308
309 /* timed out waiting for display to unblank */
310 return -EIO;
311 }
312
313 /* If display is enabled, then disable it */
314 static int ufx_disable(struct ufx_data *dev, bool wait)
315 {
316 u32 dc_ctrl, dc_sts;
317 int i;
318
319 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
320 check_warn_return(status, "ufx_disable error reading 0x2004");
321
322 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
323 check_warn_return(status, "ufx_disable error reading 0x2000");
324
325 /* return success if display is already disabled */
326 if (((dc_sts & 0x00000001) == 0) || ((dc_ctrl & 0x00000001) == 0))
327 return 0;
328
329 /* request the DC to disable the display */
330 dc_ctrl &= ~(0x00000001);
331 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
332 check_warn_return(status, "ufx_disable error writing 0x2000");
333
334 /* return success immediately if we don't have to wait */
335 if (!wait)
336 return 0;
337
338 for (i = 0; i < 250; i++) {
339 status = ufx_reg_read(dev, 0x2004, &dc_sts);
340 check_warn_return(status, "ufx_disable error reading 0x2004");
341
342 if ((dc_sts & 0x00000001) == 0)
343 return 0;
344 }
345
346 /* timed out waiting for display to disable */
347 return -EIO;
348 }
349
350 /* If display is disabled, then enable it */
351 static int ufx_enable(struct ufx_data *dev, bool wait)
352 {
353 u32 dc_ctrl, dc_sts;
354 int i;
355
356 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
357 check_warn_return(status, "ufx_enable error reading 0x2004");
358
359 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
360 check_warn_return(status, "ufx_enable error reading 0x2000");
361
362 /* return success if display is already enabled */
363 if ((dc_sts & 0x00000001) || (dc_ctrl & 0x00000001))
364 return 0;
365
366 /* request the DC to enable the display */
367 dc_ctrl |= 0x00000001;
368 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
369 check_warn_return(status, "ufx_enable error writing 0x2000");
370
371 /* return success immediately if we don't have to wait */
372 if (!wait)
373 return 0;
374
375 for (i = 0; i < 250; i++) {
376 status = ufx_reg_read(dev, 0x2004, &dc_sts);
377 check_warn_return(status, "ufx_enable error reading 0x2004");
378
379 if (dc_sts & 0x00000001)
380 return 0;
381 }
382
383 /* timed out waiting for display to enable */
384 return -EIO;
385 }
386
387 static int ufx_config_sys_clk(struct ufx_data *dev)
388 {
389 int status = ufx_reg_write(dev, 0x700C, 0x8000000F);
390 check_warn_return(status, "error writing 0x700C");
391
392 status = ufx_reg_write(dev, 0x7014, 0x0010024F);
393 check_warn_return(status, "error writing 0x7014");
394
395 status = ufx_reg_write(dev, 0x7010, 0x00000000);
396 check_warn_return(status, "error writing 0x7010");
397
398 status = ufx_reg_clear_bits(dev, 0x700C, 0x0000000A);
399 check_warn_return(status, "error clearing PLL1 bypass in 0x700C");
400 msleep(1);
401
402 status = ufx_reg_clear_bits(dev, 0x700C, 0x80000000);
403 check_warn_return(status, "error clearing output gate in 0x700C");
404
405 return 0;
406 }
407
408 static int ufx_config_ddr2(struct ufx_data *dev)
409 {
410 int status, i = 0;
411 u32 tmp;
412
413 status = ufx_reg_write(dev, 0x0004, 0x001F0F77);
414 check_warn_return(status, "error writing 0x0004");
415
416 status = ufx_reg_write(dev, 0x0008, 0xFFF00000);
417 check_warn_return(status, "error writing 0x0008");
418
419 status = ufx_reg_write(dev, 0x000C, 0x0FFF2222);
420 check_warn_return(status, "error writing 0x000C");
421
422 status = ufx_reg_write(dev, 0x0010, 0x00030814);
423 check_warn_return(status, "error writing 0x0010");
424
425 status = ufx_reg_write(dev, 0x0014, 0x00500019);
426 check_warn_return(status, "error writing 0x0014");
427
428 status = ufx_reg_write(dev, 0x0018, 0x020D0F15);
429 check_warn_return(status, "error writing 0x0018");
430
431 status = ufx_reg_write(dev, 0x001C, 0x02532305);
432 check_warn_return(status, "error writing 0x001C");
433
434 status = ufx_reg_write(dev, 0x0020, 0x0B030905);
435 check_warn_return(status, "error writing 0x0020");
436
437 status = ufx_reg_write(dev, 0x0024, 0x00000827);
438 check_warn_return(status, "error writing 0x0024");
439
440 status = ufx_reg_write(dev, 0x0028, 0x00000000);
441 check_warn_return(status, "error writing 0x0028");
442
443 status = ufx_reg_write(dev, 0x002C, 0x00000042);
444 check_warn_return(status, "error writing 0x002C");
445
446 status = ufx_reg_write(dev, 0x0030, 0x09520000);
447 check_warn_return(status, "error writing 0x0030");
448
449 status = ufx_reg_write(dev, 0x0034, 0x02223314);
450 check_warn_return(status, "error writing 0x0034");
451
452 status = ufx_reg_write(dev, 0x0038, 0x00430043);
453 check_warn_return(status, "error writing 0x0038");
454
455 status = ufx_reg_write(dev, 0x003C, 0xF00F000F);
456 check_warn_return(status, "error writing 0x003C");
457
458 status = ufx_reg_write(dev, 0x0040, 0xF380F00F);
459 check_warn_return(status, "error writing 0x0040");
460
461 status = ufx_reg_write(dev, 0x0044, 0xF00F0496);
462 check_warn_return(status, "error writing 0x0044");
463
464 status = ufx_reg_write(dev, 0x0048, 0x03080406);
465 check_warn_return(status, "error writing 0x0048");
466
467 status = ufx_reg_write(dev, 0x004C, 0x00001000);
468 check_warn_return(status, "error writing 0x004C");
469
470 status = ufx_reg_write(dev, 0x005C, 0x00000007);
471 check_warn_return(status, "error writing 0x005C");
472
473 status = ufx_reg_write(dev, 0x0100, 0x54F00012);
474 check_warn_return(status, "error writing 0x0100");
475
476 status = ufx_reg_write(dev, 0x0104, 0x00004012);
477 check_warn_return(status, "error writing 0x0104");
478
479 status = ufx_reg_write(dev, 0x0118, 0x40404040);
480 check_warn_return(status, "error writing 0x0118");
481
482 status = ufx_reg_write(dev, 0x0000, 0x00000001);
483 check_warn_return(status, "error writing 0x0000");
484
485 while (i++ < 500) {
486 status = ufx_reg_read(dev, 0x0000, &tmp);
487 check_warn_return(status, "error reading 0x0000");
488
489 if (all_bits_set(tmp, 0xC0000000))
490 return 0;
491 }
492
493 pr_err("DDR2 initialisation timed out, reg 0x0000=0x%08x", tmp);
494 return -ETIMEDOUT;
495 }
496
497 struct pll_values {
498 u32 div_r0;
499 u32 div_f0;
500 u32 div_q0;
501 u32 range0;
502 u32 div_r1;
503 u32 div_f1;
504 u32 div_q1;
505 u32 range1;
506 };
507
508 static u32 ufx_calc_range(u32 ref_freq)
509 {
510 if (ref_freq >= 88000000)
511 return 7;
512
513 if (ref_freq >= 54000000)
514 return 6;
515
516 if (ref_freq >= 34000000)
517 return 5;
518
519 if (ref_freq >= 21000000)
520 return 4;
521
522 if (ref_freq >= 13000000)
523 return 3;
524
525 if (ref_freq >= 8000000)
526 return 2;
527
528 return 1;
529 }
530
531 /* calculates PLL divider settings for a desired target frequency */
532 static void ufx_calc_pll_values(const u32 clk_pixel_pll, struct pll_values *asic_pll)
533 {
534 const u32 ref_clk = 25000000;
535 u32 div_r0, div_f0, div_q0, div_r1, div_f1, div_q1;
536 u32 min_error = clk_pixel_pll;
537
538 for (div_r0 = 1; div_r0 <= 32; div_r0++) {
539 u32 ref_freq0 = ref_clk / div_r0;
540 if (ref_freq0 < 5000000)
541 break;
542
543 if (ref_freq0 > 200000000)
544 continue;
545
546 for (div_f0 = 1; div_f0 <= 256; div_f0++) {
547 u32 vco_freq0 = ref_freq0 * div_f0;
548
549 if (vco_freq0 < 350000000)
550 continue;
551
552 if (vco_freq0 > 700000000)
553 break;
554
555 for (div_q0 = 0; div_q0 < 7; div_q0++) {
556 u32 pllout_freq0 = vco_freq0 / (1 << div_q0);
557
558 if (pllout_freq0 < 5000000)
559 break;
560
561 if (pllout_freq0 > 200000000)
562 continue;
563
564 for (div_r1 = 1; div_r1 <= 32; div_r1++) {
565 u32 ref_freq1 = pllout_freq0 / div_r1;
566
567 if (ref_freq1 < 5000000)
568 break;
569
570 for (div_f1 = 1; div_f1 <= 256; div_f1++) {
571 u32 vco_freq1 = ref_freq1 * div_f1;
572
573 if (vco_freq1 < 350000000)
574 continue;
575
576 if (vco_freq1 > 700000000)
577 break;
578
579 for (div_q1 = 0; div_q1 < 7; div_q1++) {
580 u32 pllout_freq1 = vco_freq1 / (1 << div_q1);
581 int error = abs(pllout_freq1 - clk_pixel_pll);
582
583 if (pllout_freq1 < 5000000)
584 break;
585
586 if (pllout_freq1 > 700000000)
587 continue;
588
589 if (error < min_error) {
590 min_error = error;
591
592 /* final returned value is equal to calculated value - 1
593 * because a value of 0 = divide by 1 */
594 asic_pll->div_r0 = div_r0 - 1;
595 asic_pll->div_f0 = div_f0 - 1;
596 asic_pll->div_q0 = div_q0;
597 asic_pll->div_r1 = div_r1 - 1;
598 asic_pll->div_f1 = div_f1 - 1;
599 asic_pll->div_q1 = div_q1;
600
601 asic_pll->range0 = ufx_calc_range(ref_freq0);
602 asic_pll->range1 = ufx_calc_range(ref_freq1);
603
604 if (min_error == 0)
605 return;
606 }
607 }
608 }
609 }
610 }
611 }
612 }
613 }
614
615 /* sets analog bit PLL configuration values */
616 static int ufx_config_pix_clk(struct ufx_data *dev, u32 pixclock)
617 {
618 struct pll_values asic_pll = {0};
619 u32 value, clk_pixel, clk_pixel_pll;
620 int status;
621
622 /* convert pixclock (in ps) to frequency (in Hz) */
623 clk_pixel = PICOS2KHZ(pixclock) * 1000;
624 pr_debug("pixclock %d ps = clk_pixel %d Hz", pixclock, clk_pixel);
625
626 /* clk_pixel = 1/2 clk_pixel_pll */
627 clk_pixel_pll = clk_pixel * 2;
628
629 ufx_calc_pll_values(clk_pixel_pll, &asic_pll);
630
631 /* Keep BYPASS and RESET signals asserted until configured */
632 status = ufx_reg_write(dev, 0x7000, 0x8000000F);
633 check_warn_return(status, "error writing 0x7000");
634
635 value = (asic_pll.div_f1 | (asic_pll.div_r1 << 8) |
636 (asic_pll.div_q1 << 16) | (asic_pll.range1 << 20));
637 status = ufx_reg_write(dev, 0x7008, value);
638 check_warn_return(status, "error writing 0x7008");
639
640 value = (asic_pll.div_f0 | (asic_pll.div_r0 << 8) |
641 (asic_pll.div_q0 << 16) | (asic_pll.range0 << 20));
642 status = ufx_reg_write(dev, 0x7004, value);
643 check_warn_return(status, "error writing 0x7004");
644
645 status = ufx_reg_clear_bits(dev, 0x7000, 0x00000005);
646 check_warn_return(status,
647 "error clearing PLL0 bypass bits in 0x7000");
648 msleep(1);
649
650 status = ufx_reg_clear_bits(dev, 0x7000, 0x0000000A);
651 check_warn_return(status,
652 "error clearing PLL1 bypass bits in 0x7000");
653 msleep(1);
654
655 status = ufx_reg_clear_bits(dev, 0x7000, 0x80000000);
656 check_warn_return(status, "error clearing gate bits in 0x7000");
657
658 return 0;
659 }
660
661 static int ufx_set_vid_mode(struct ufx_data *dev, struct fb_var_screeninfo *var)
662 {
663 u32 temp;
664 u16 h_total, h_active, h_blank_start, h_blank_end, h_sync_start, h_sync_end;
665 u16 v_total, v_active, v_blank_start, v_blank_end, v_sync_start, v_sync_end;
666
667 int status = ufx_reg_write(dev, 0x8028, 0);
668 check_warn_return(status, "ufx_set_vid_mode error disabling RGB pad");
669
670 status = ufx_reg_write(dev, 0x8024, 0);
671 check_warn_return(status, "ufx_set_vid_mode error disabling VDAC");
672
673 /* shut everything down before changing timing */
674 status = ufx_blank(dev, true);
675 check_warn_return(status, "ufx_set_vid_mode error blanking display");
676
677 status = ufx_disable(dev, true);
678 check_warn_return(status, "ufx_set_vid_mode error disabling display");
679
680 status = ufx_config_pix_clk(dev, var->pixclock);
681 check_warn_return(status, "ufx_set_vid_mode error configuring pixclock");
682
683 status = ufx_reg_write(dev, 0x2000, 0x00000104);
684 check_warn_return(status, "ufx_set_vid_mode error writing 0x2000");
685
686 /* set horizontal timings */
687 h_total = var->xres + var->right_margin + var->hsync_len + var->left_margin;
688 h_active = var->xres;
689 h_blank_start = var->xres + var->right_margin;
690 h_blank_end = var->xres + var->right_margin + var->hsync_len;
691 h_sync_start = var->xres + var->right_margin;
692 h_sync_end = var->xres + var->right_margin + var->hsync_len;
693
694 temp = ((h_total - 1) << 16) | (h_active - 1);
695 status = ufx_reg_write(dev, 0x2008, temp);
696 check_warn_return(status, "ufx_set_vid_mode error writing 0x2008");
697
698 temp = ((h_blank_start - 1) << 16) | (h_blank_end - 1);
699 status = ufx_reg_write(dev, 0x200C, temp);
700 check_warn_return(status, "ufx_set_vid_mode error writing 0x200C");
701
702 temp = ((h_sync_start - 1) << 16) | (h_sync_end - 1);
703 status = ufx_reg_write(dev, 0x2010, temp);
704 check_warn_return(status, "ufx_set_vid_mode error writing 0x2010");
705
706 /* set vertical timings */
707 v_total = var->upper_margin + var->yres + var->lower_margin + var->vsync_len;
708 v_active = var->yres;
709 v_blank_start = var->yres + var->lower_margin;
710 v_blank_end = var->yres + var->lower_margin + var->vsync_len;
711 v_sync_start = var->yres + var->lower_margin;
712 v_sync_end = var->yres + var->lower_margin + var->vsync_len;
713
714 temp = ((v_total - 1) << 16) | (v_active - 1);
715 status = ufx_reg_write(dev, 0x2014, temp);
716 check_warn_return(status, "ufx_set_vid_mode error writing 0x2014");
717
718 temp = ((v_blank_start - 1) << 16) | (v_blank_end - 1);
719 status = ufx_reg_write(dev, 0x2018, temp);
720 check_warn_return(status, "ufx_set_vid_mode error writing 0x2018");
721
722 temp = ((v_sync_start - 1) << 16) | (v_sync_end - 1);
723 status = ufx_reg_write(dev, 0x201C, temp);
724 check_warn_return(status, "ufx_set_vid_mode error writing 0x201C");
725
726 status = ufx_reg_write(dev, 0x2020, 0x00000000);
727 check_warn_return(status, "ufx_set_vid_mode error writing 0x2020");
728
729 status = ufx_reg_write(dev, 0x2024, 0x00000000);
730 check_warn_return(status, "ufx_set_vid_mode error writing 0x2024");
731
732 /* Set the frame length register (#pix * 2 bytes/pixel) */
733 temp = var->xres * var->yres * 2;
734 temp = (temp + 7) & (~0x7);
735 status = ufx_reg_write(dev, 0x2028, temp);
736 check_warn_return(status, "ufx_set_vid_mode error writing 0x2028");
737
738 /* enable desired output interface & disable others */
739 status = ufx_reg_write(dev, 0x2040, 0);
740 check_warn_return(status, "ufx_set_vid_mode error writing 0x2040");
741
742 status = ufx_reg_write(dev, 0x2044, 0);
743 check_warn_return(status, "ufx_set_vid_mode error writing 0x2044");
744
745 status = ufx_reg_write(dev, 0x2048, 0);
746 check_warn_return(status, "ufx_set_vid_mode error writing 0x2048");
747
748 /* set the sync polarities & enable bit */
749 temp = 0x00000001;
750 if (var->sync & FB_SYNC_HOR_HIGH_ACT)
751 temp |= 0x00000010;
752
753 if (var->sync & FB_SYNC_VERT_HIGH_ACT)
754 temp |= 0x00000008;
755
756 status = ufx_reg_write(dev, 0x2040, temp);
757 check_warn_return(status, "ufx_set_vid_mode error writing 0x2040");
758
759 /* start everything back up */
760 status = ufx_enable(dev, true);
761 check_warn_return(status, "ufx_set_vid_mode error enabling display");
762
763 /* Unblank the display */
764 status = ufx_unblank(dev, true);
765 check_warn_return(status, "ufx_set_vid_mode error unblanking display");
766
767 /* enable RGB pad */
768 status = ufx_reg_write(dev, 0x8028, 0x00000003);
769 check_warn_return(status, "ufx_set_vid_mode error enabling RGB pad");
770
771 /* enable VDAC */
772 status = ufx_reg_write(dev, 0x8024, 0x00000007);
773 check_warn_return(status, "ufx_set_vid_mode error enabling VDAC");
774
775 return 0;
776 }
777
778 static int ufx_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
779 {
780 unsigned long start = vma->vm_start;
781 unsigned long size = vma->vm_end - vma->vm_start;
782 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
783 unsigned long page, pos;
784
785 if (offset + size > info->fix.smem_len)
786 return -EINVAL;
787
788 pos = (unsigned long)info->fix.smem_start + offset;
789
790 pr_debug("mmap() framebuffer addr:%lu size:%lu\n",
791 pos, size);
792
793 while (size > 0) {
794 page = vmalloc_to_pfn((void *)pos);
795 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
796 return -EAGAIN;
797
798 start += PAGE_SIZE;
799 pos += PAGE_SIZE;
800 if (size > PAGE_SIZE)
801 size -= PAGE_SIZE;
802 else
803 size = 0;
804 }
805
806 vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
807 return 0;
808 }
809
810 static void ufx_raw_rect(struct ufx_data *dev, u16 *cmd, int x, int y,
811 int width, int height)
812 {
813 size_t packed_line_len = ALIGN((width * 2), 4);
814 size_t packed_rect_len = packed_line_len * height;
815 int line;
816
817 BUG_ON(!dev);
818 BUG_ON(!dev->info);
819
820 /* command word */
821 *((u32 *)&cmd[0]) = cpu_to_le32(0x01);
822
823 /* length word */
824 *((u32 *)&cmd[2]) = cpu_to_le32(packed_rect_len + 16);
825
826 cmd[4] = cpu_to_le16(x);
827 cmd[5] = cpu_to_le16(y);
828 cmd[6] = cpu_to_le16(width);
829 cmd[7] = cpu_to_le16(height);
830
831 /* frame base address */
832 *((u32 *)&cmd[8]) = cpu_to_le32(0);
833
834 /* color mode and horizontal resolution */
835 cmd[10] = cpu_to_le16(0x4000 | dev->info->var.xres);
836
837 /* vertical resolution */
838 cmd[11] = cpu_to_le16(dev->info->var.yres);
839
840 /* packed data */
841 for (line = 0; line < height; line++) {
842 const int line_offset = dev->info->fix.line_length * (y + line);
843 const int byte_offset = line_offset + (x * BPP);
844 memcpy(&cmd[(24 + (packed_line_len * line)) / 2],
845 (char *)dev->info->fix.smem_start + byte_offset, width * BPP);
846 }
847 }
848
849 int ufx_handle_damage(struct ufx_data *dev, int x, int y,
850 int width, int height)
851 {
852 size_t packed_line_len = ALIGN((width * 2), 4);
853 int len, status, urb_lines, start_line = 0;
854
855 if ((width <= 0) || (height <= 0) ||
856 (x + width > dev->info->var.xres) ||
857 (y + height > dev->info->var.yres))
858 return -EINVAL;
859
860 if (!atomic_read(&dev->usb_active))
861 return 0;
862
863 while (start_line < height) {
864 struct urb *urb = ufx_get_urb(dev);
865 if (!urb) {
866 pr_warn("ufx_handle_damage unable to get urb");
867 return 0;
868 }
869
870 /* assume we have enough space to transfer at least one line */
871 BUG_ON(urb->transfer_buffer_length < (24 + (width * 2)));
872
873 /* calculate the maximum number of lines we could fit in */
874 urb_lines = (urb->transfer_buffer_length - 24) / packed_line_len;
875
876 /* but we might not need this many */
877 urb_lines = min(urb_lines, (height - start_line));
878
879 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
880
881 ufx_raw_rect(dev, urb->transfer_buffer, x, (y + start_line), width, urb_lines);
882 len = 24 + (packed_line_len * urb_lines);
883
884 status = ufx_submit_urb(dev, urb, len);
885 check_warn_return(status, "Error submitting URB");
886
887 start_line += urb_lines;
888 }
889
890 return 0;
891 }
892
893 /* Path triggered by usermode clients who write to filesystem
894 * e.g. cat filename > /dev/fb1
895 * Not used by X Windows or text-mode console. But useful for testing.
896 * Slow because of extra copy and we must assume all pixels dirty. */
897 static ssize_t ufx_ops_write(struct fb_info *info, const char __user *buf,
898 size_t count, loff_t *ppos)
899 {
900 ssize_t result;
901 struct ufx_data *dev = info->par;
902 u32 offset = (u32) *ppos;
903
904 result = fb_sys_write(info, buf, count, ppos);
905
906 if (result > 0) {
907 int start = max((int)(offset / info->fix.line_length) - 1, 0);
908 int lines = min((u32)((result / info->fix.line_length) + 1),
909 (u32)info->var.yres);
910
911 ufx_handle_damage(dev, 0, start, info->var.xres, lines);
912 }
913
914 return result;
915 }
916
917 static void ufx_ops_copyarea(struct fb_info *info,
918 const struct fb_copyarea *area)
919 {
920
921 struct ufx_data *dev = info->par;
922
923 sys_copyarea(info, area);
924
925 ufx_handle_damage(dev, area->dx, area->dy,
926 area->width, area->height);
927 }
928
929 static void ufx_ops_imageblit(struct fb_info *info,
930 const struct fb_image *image)
931 {
932 struct ufx_data *dev = info->par;
933
934 sys_imageblit(info, image);
935
936 ufx_handle_damage(dev, image->dx, image->dy,
937 image->width, image->height);
938 }
939
940 static void ufx_ops_fillrect(struct fb_info *info,
941 const struct fb_fillrect *rect)
942 {
943 struct ufx_data *dev = info->par;
944
945 sys_fillrect(info, rect);
946
947 ufx_handle_damage(dev, rect->dx, rect->dy, rect->width,
948 rect->height);
949 }
950
951 /* NOTE: fb_defio.c is holding info->fbdefio.mutex
952 * Touching ANY framebuffer memory that triggers a page fault
953 * in fb_defio will cause a deadlock, when it also tries to
954 * grab the same mutex. */
955 static void ufx_dpy_deferred_io(struct fb_info *info,
956 struct list_head *pagelist)
957 {
958 struct page *cur;
959 struct fb_deferred_io *fbdefio = info->fbdefio;
960 struct ufx_data *dev = info->par;
961
962 if (!fb_defio)
963 return;
964
965 if (!atomic_read(&dev->usb_active))
966 return;
967
968 /* walk the written page list and render each to device */
969 list_for_each_entry(cur, &fbdefio->pagelist, lru) {
970 /* create a rectangle of full screen width that encloses the
971 * entire dirty framebuffer page */
972 const int x = 0;
973 const int width = dev->info->var.xres;
974 const int y = (cur->index << PAGE_SHIFT) / (width * 2);
975 int height = (PAGE_SIZE / (width * 2)) + 1;
976 height = min(height, (int)(dev->info->var.yres - y));
977
978 BUG_ON(y >= dev->info->var.yres);
979 BUG_ON((y + height) > dev->info->var.yres);
980
981 ufx_handle_damage(dev, x, y, width, height);
982 }
983 }
984
985 static int ufx_ops_ioctl(struct fb_info *info, unsigned int cmd,
986 unsigned long arg)
987 {
988 struct ufx_data *dev = info->par;
989 struct dloarea *area = NULL;
990
991 if (!atomic_read(&dev->usb_active))
992 return 0;
993
994 /* TODO: Update X server to get this from sysfs instead */
995 if (cmd == UFX_IOCTL_RETURN_EDID) {
996 u8 __user *edid = (u8 __user *)arg;
997 if (copy_to_user(edid, dev->edid, dev->edid_size))
998 return -EFAULT;
999 return 0;
1000 }
1001
1002 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */
1003 if (cmd == UFX_IOCTL_REPORT_DAMAGE) {
1004 /* If we have a damage-aware client, turn fb_defio "off"
1005 * To avoid perf imact of unecessary page fault handling.
1006 * Done by resetting the delay for this fb_info to a very
1007 * long period. Pages will become writable and stay that way.
1008 * Reset to normal value when all clients have closed this fb.
1009 */
1010 if (info->fbdefio)
1011 info->fbdefio->delay = UFX_DEFIO_WRITE_DISABLE;
1012
1013 area = (struct dloarea *)arg;
1014
1015 if (area->x < 0)
1016 area->x = 0;
1017
1018 if (area->x > info->var.xres)
1019 area->x = info->var.xres;
1020
1021 if (area->y < 0)
1022 area->y = 0;
1023
1024 if (area->y > info->var.yres)
1025 area->y = info->var.yres;
1026
1027 ufx_handle_damage(dev, area->x, area->y, area->w, area->h);
1028 }
1029
1030 return 0;
1031 }
1032
1033 /* taken from vesafb */
1034 static int
1035 ufx_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
1036 unsigned blue, unsigned transp, struct fb_info *info)
1037 {
1038 int err = 0;
1039
1040 if (regno >= info->cmap.len)
1041 return 1;
1042
1043 if (regno < 16) {
1044 if (info->var.red.offset == 10) {
1045 /* 1:5:5:5 */
1046 ((u32 *) (info->pseudo_palette))[regno] =
1047 ((red & 0xf800) >> 1) |
1048 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
1049 } else {
1050 /* 0:5:6:5 */
1051 ((u32 *) (info->pseudo_palette))[regno] =
1052 ((red & 0xf800)) |
1053 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
1054 }
1055 }
1056
1057 return err;
1058 }
1059
1060 /* It's common for several clients to have framebuffer open simultaneously.
1061 * e.g. both fbcon and X. Makes things interesting.
1062 * Assumes caller is holding info->lock (for open and release at least) */
1063 static int ufx_ops_open(struct fb_info *info, int user)
1064 {
1065 struct ufx_data *dev = info->par;
1066
1067 /* fbcon aggressively connects to first framebuffer it finds,
1068 * preventing other clients (X) from working properly. Usually
1069 * not what the user wants. Fail by default with option to enable. */
1070 if (user == 0 && !console)
1071 return -EBUSY;
1072
1073 /* If the USB device is gone, we don't accept new opens */
1074 if (dev->virtualized)
1075 return -ENODEV;
1076
1077 dev->fb_count++;
1078
1079 kref_get(&dev->kref);
1080
1081 if (fb_defio && (info->fbdefio == NULL)) {
1082 /* enable defio at last moment if not disabled by client */
1083
1084 struct fb_deferred_io *fbdefio;
1085
1086 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
1087
1088 if (fbdefio) {
1089 fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1090 fbdefio->deferred_io = ufx_dpy_deferred_io;
1091 }
1092
1093 info->fbdefio = fbdefio;
1094 fb_deferred_io_init(info);
1095 }
1096
1097 pr_debug("open /dev/fb%d user=%d fb_info=%p count=%d",
1098 info->node, user, info, dev->fb_count);
1099
1100 return 0;
1101 }
1102
1103 /*
1104 * Called when all client interfaces to start transactions have been disabled,
1105 * and all references to our device instance (ufx_data) are released.
1106 * Every transaction must have a reference, so we know are fully spun down
1107 */
1108 static void ufx_free(struct kref *kref)
1109 {
1110 struct ufx_data *dev = container_of(kref, struct ufx_data, kref);
1111
1112 /* this function will wait for all in-flight urbs to complete */
1113 if (dev->urbs.count > 0)
1114 ufx_free_urb_list(dev);
1115
1116 pr_debug("freeing ufx_data %p", dev);
1117
1118 kfree(dev);
1119 }
1120
1121 static void ufx_release_urb_work(struct work_struct *work)
1122 {
1123 struct urb_node *unode = container_of(work, struct urb_node,
1124 release_urb_work.work);
1125
1126 up(&unode->dev->urbs.limit_sem);
1127 }
1128
1129 static void ufx_free_framebuffer_work(struct work_struct *work)
1130 {
1131 struct ufx_data *dev = container_of(work, struct ufx_data,
1132 free_framebuffer_work.work);
1133 struct fb_info *info = dev->info;
1134 int node = info->node;
1135
1136 unregister_framebuffer(info);
1137
1138 if (info->cmap.len != 0)
1139 fb_dealloc_cmap(&info->cmap);
1140 if (info->monspecs.modedb)
1141 fb_destroy_modedb(info->monspecs.modedb);
1142 if (info->screen_base)
1143 vfree(info->screen_base);
1144
1145 fb_destroy_modelist(&info->modelist);
1146
1147 dev->info = 0;
1148
1149 /* Assume info structure is freed after this point */
1150 framebuffer_release(info);
1151
1152 pr_debug("fb_info for /dev/fb%d has been freed", node);
1153
1154 /* ref taken in probe() as part of registering framebfufer */
1155 kref_put(&dev->kref, ufx_free);
1156 }
1157
1158 /*
1159 * Assumes caller is holding info->lock mutex (for open and release at least)
1160 */
1161 static int ufx_ops_release(struct fb_info *info, int user)
1162 {
1163 struct ufx_data *dev = info->par;
1164
1165 dev->fb_count--;
1166
1167 /* We can't free fb_info here - fbmem will touch it when we return */
1168 if (dev->virtualized && (dev->fb_count == 0))
1169 schedule_delayed_work(&dev->free_framebuffer_work, HZ);
1170
1171 if ((dev->fb_count == 0) && (info->fbdefio)) {
1172 fb_deferred_io_cleanup(info);
1173 kfree(info->fbdefio);
1174 info->fbdefio = NULL;
1175 info->fbops->fb_mmap = ufx_ops_mmap;
1176 }
1177
1178 pr_debug("released /dev/fb%d user=%d count=%d",
1179 info->node, user, dev->fb_count);
1180
1181 kref_put(&dev->kref, ufx_free);
1182
1183 return 0;
1184 }
1185
1186 /* Check whether a video mode is supported by the chip
1187 * We start from monitor's modes, so don't need to filter that here */
1188 static int ufx_is_valid_mode(struct fb_videomode *mode,
1189 struct fb_info *info)
1190 {
1191 if ((mode->xres * mode->yres) > (2048 * 1152)) {
1192 pr_debug("%dx%d too many pixels",
1193 mode->xres, mode->yres);
1194 return 0;
1195 }
1196
1197 if (mode->pixclock < 5000) {
1198 pr_debug("%dx%d %dps pixel clock too fast",
1199 mode->xres, mode->yres, mode->pixclock);
1200 return 0;
1201 }
1202
1203 pr_debug("%dx%d (pixclk %dps %dMHz) valid mode", mode->xres, mode->yres,
1204 mode->pixclock, (1000000 / mode->pixclock));
1205 return 1;
1206 }
1207
1208 static void ufx_var_color_format(struct fb_var_screeninfo *var)
1209 {
1210 const struct fb_bitfield red = { 11, 5, 0 };
1211 const struct fb_bitfield green = { 5, 6, 0 };
1212 const struct fb_bitfield blue = { 0, 5, 0 };
1213
1214 var->bits_per_pixel = 16;
1215 var->red = red;
1216 var->green = green;
1217 var->blue = blue;
1218 }
1219
1220 static int ufx_ops_check_var(struct fb_var_screeninfo *var,
1221 struct fb_info *info)
1222 {
1223 struct fb_videomode mode;
1224
1225 /* TODO: support dynamically changing framebuffer size */
1226 if ((var->xres * var->yres * 2) > info->fix.smem_len)
1227 return -EINVAL;
1228
1229 /* set device-specific elements of var unrelated to mode */
1230 ufx_var_color_format(var);
1231
1232 fb_var_to_videomode(&mode, var);
1233
1234 if (!ufx_is_valid_mode(&mode, info))
1235 return -EINVAL;
1236
1237 return 0;
1238 }
1239
1240 static int ufx_ops_set_par(struct fb_info *info)
1241 {
1242 struct ufx_data *dev = info->par;
1243 int result;
1244 u16 *pix_framebuffer;
1245 int i;
1246
1247 pr_debug("set_par mode %dx%d", info->var.xres, info->var.yres);
1248 result = ufx_set_vid_mode(dev, &info->var);
1249
1250 if ((result == 0) && (dev->fb_count == 0)) {
1251 /* paint greenscreen */
1252 pix_framebuffer = (u16 *) info->screen_base;
1253 for (i = 0; i < info->fix.smem_len / 2; i++)
1254 pix_framebuffer[i] = 0x37e6;
1255
1256 ufx_handle_damage(dev, 0, 0, info->var.xres, info->var.yres);
1257 }
1258
1259 /* re-enable defio if previously disabled by damage tracking */
1260 if (info->fbdefio)
1261 info->fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1262
1263 return result;
1264 }
1265
1266 /* In order to come back from full DPMS off, we need to set the mode again */
1267 static int ufx_ops_blank(int blank_mode, struct fb_info *info)
1268 {
1269 struct ufx_data *dev = info->par;
1270 ufx_set_vid_mode(dev, &info->var);
1271 return 0;
1272 }
1273
1274 static struct fb_ops ufx_ops = {
1275 .owner = THIS_MODULE,
1276 .fb_read = fb_sys_read,
1277 .fb_write = ufx_ops_write,
1278 .fb_setcolreg = ufx_ops_setcolreg,
1279 .fb_fillrect = ufx_ops_fillrect,
1280 .fb_copyarea = ufx_ops_copyarea,
1281 .fb_imageblit = ufx_ops_imageblit,
1282 .fb_mmap = ufx_ops_mmap,
1283 .fb_ioctl = ufx_ops_ioctl,
1284 .fb_open = ufx_ops_open,
1285 .fb_release = ufx_ops_release,
1286 .fb_blank = ufx_ops_blank,
1287 .fb_check_var = ufx_ops_check_var,
1288 .fb_set_par = ufx_ops_set_par,
1289 };
1290
1291 /* Assumes &info->lock held by caller
1292 * Assumes no active clients have framebuffer open */
1293 static int ufx_realloc_framebuffer(struct ufx_data *dev, struct fb_info *info)
1294 {
1295 int retval = -ENOMEM;
1296 int old_len = info->fix.smem_len;
1297 int new_len;
1298 unsigned char *old_fb = info->screen_base;
1299 unsigned char *new_fb;
1300
1301 pr_debug("Reallocating framebuffer. Addresses will change!");
1302
1303 new_len = info->fix.line_length * info->var.yres;
1304
1305 if (PAGE_ALIGN(new_len) > old_len) {
1306 /*
1307 * Alloc system memory for virtual framebuffer
1308 */
1309 new_fb = vmalloc(new_len);
1310 if (!new_fb) {
1311 pr_err("Virtual framebuffer alloc failed");
1312 goto error;
1313 }
1314
1315 if (info->screen_base) {
1316 memcpy(new_fb, old_fb, old_len);
1317 vfree(info->screen_base);
1318 }
1319
1320 info->screen_base = new_fb;
1321 info->fix.smem_len = PAGE_ALIGN(new_len);
1322 info->fix.smem_start = (unsigned long) new_fb;
1323 info->flags = smscufx_info_flags;
1324 }
1325
1326 retval = 0;
1327
1328 error:
1329 return retval;
1330 }
1331
1332 /* sets up I2C Controller for 100 Kbps, std. speed, 7-bit addr, master,
1333 * restart enabled, but no start byte, enable controller */
1334 static int ufx_i2c_init(struct ufx_data *dev)
1335 {
1336 u32 tmp;
1337
1338 /* disable the controller before it can be reprogrammed */
1339 int status = ufx_reg_write(dev, 0x106C, 0x00);
1340 check_warn_return(status, "failed to disable I2C");
1341
1342 /* Setup the clock count registers
1343 * (12+1) = 13 clks @ 2.5 MHz = 5.2 uS */
1344 status = ufx_reg_write(dev, 0x1018, 12);
1345 check_warn_return(status, "error writing 0x1018");
1346
1347 /* (6+8) = 14 clks @ 2.5 MHz = 5.6 uS */
1348 status = ufx_reg_write(dev, 0x1014, 6);
1349 check_warn_return(status, "error writing 0x1014");
1350
1351 status = ufx_reg_read(dev, 0x1000, &tmp);
1352 check_warn_return(status, "error reading 0x1000");
1353
1354 /* set speed to std mode */
1355 tmp &= ~(0x06);
1356 tmp |= 0x02;
1357
1358 /* 7-bit (not 10-bit) addressing */
1359 tmp &= ~(0x10);
1360
1361 /* enable restart conditions and master mode */
1362 tmp |= 0x21;
1363
1364 status = ufx_reg_write(dev, 0x1000, tmp);
1365 check_warn_return(status, "error writing 0x1000");
1366
1367 /* Set normal tx using target address 0 */
1368 status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0xC00, 0x000);
1369 check_warn_return(status, "error setting TX mode bits in 0x1004");
1370
1371 /* Enable the controller */
1372 status = ufx_reg_write(dev, 0x106C, 0x01);
1373 check_warn_return(status, "failed to enable I2C");
1374
1375 return 0;
1376 }
1377
1378 /* sets the I2C port mux and target address */
1379 static int ufx_i2c_configure(struct ufx_data *dev)
1380 {
1381 int status = ufx_reg_write(dev, 0x106C, 0x00);
1382 check_warn_return(status, "failed to disable I2C");
1383
1384 status = ufx_reg_write(dev, 0x3010, 0x00000000);
1385 check_warn_return(status, "failed to write 0x3010");
1386
1387 /* A0h is std for any EDID, right shifted by one */
1388 status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0x3FF, (0xA0 >> 1));
1389 check_warn_return(status, "failed to set TAR bits in 0x1004");
1390
1391 status = ufx_reg_write(dev, 0x106C, 0x01);
1392 check_warn_return(status, "failed to enable I2C");
1393
1394 return 0;
1395 }
1396
1397 /* wait for BUSY to clear, with a timeout of 50ms with 10ms sleeps. if no
1398 * monitor is connected, there is no error except for timeout */
1399 static int ufx_i2c_wait_busy(struct ufx_data *dev)
1400 {
1401 u32 tmp;
1402 int i, status;
1403
1404 for (i = 0; i < 15; i++) {
1405 status = ufx_reg_read(dev, 0x1100, &tmp);
1406 check_warn_return(status, "0x1100 read failed");
1407
1408 /* if BUSY is clear, check for error */
1409 if ((tmp & 0x80000000) == 0) {
1410 if (tmp & 0x20000000) {
1411 pr_warn("I2C read failed, 0x1100=0x%08x", tmp);
1412 return -EIO;
1413 }
1414
1415 return 0;
1416 }
1417
1418 /* perform the first 10 retries without delay */
1419 if (i >= 10)
1420 msleep(10);
1421 }
1422
1423 pr_warn("I2C access timed out, resetting I2C hardware");
1424 status = ufx_reg_write(dev, 0x1100, 0x40000000);
1425 check_warn_return(status, "0x1100 write failed");
1426
1427 return -ETIMEDOUT;
1428 }
1429
1430 /* reads a 128-byte EDID block from the currently selected port and TAR */
1431 static int ufx_read_edid(struct ufx_data *dev, u8 *edid, int edid_len)
1432 {
1433 int i, j, status;
1434 u32 *edid_u32 = (u32 *)edid;
1435
1436 BUG_ON(edid_len != EDID_LENGTH);
1437
1438 status = ufx_i2c_configure(dev);
1439 if (status < 0) {
1440 pr_err("ufx_i2c_configure failed");
1441 return status;
1442 }
1443
1444 memset(edid, 0xff, EDID_LENGTH);
1445
1446 /* Read the 128-byte EDID as 2 bursts of 64 bytes */
1447 for (i = 0; i < 2; i++) {
1448 u32 temp = 0x28070000 | (63 << 20) | (((u32)(i * 64)) << 8);
1449 status = ufx_reg_write(dev, 0x1100, temp);
1450 check_warn_return(status, "Failed to write 0x1100");
1451
1452 temp |= 0x80000000;
1453 status = ufx_reg_write(dev, 0x1100, temp);
1454 check_warn_return(status, "Failed to write 0x1100");
1455
1456 status = ufx_i2c_wait_busy(dev);
1457 check_warn_return(status, "Timeout waiting for I2C BUSY to clear");
1458
1459 for (j = 0; j < 16; j++) {
1460 u32 data_reg_addr = 0x1110 + (j * 4);
1461 status = ufx_reg_read(dev, data_reg_addr, edid_u32++);
1462 check_warn_return(status, "Error reading i2c data");
1463 }
1464 }
1465
1466 /* all FF's in the first 16 bytes indicates nothing is connected */
1467 for (i = 0; i < 16; i++) {
1468 if (edid[i] != 0xFF) {
1469 pr_debug("edid data read succesfully");
1470 return EDID_LENGTH;
1471 }
1472 }
1473
1474 pr_warn("edid data contains all 0xff");
1475 return -ETIMEDOUT;
1476 }
1477
1478 /* 1) use sw default
1479 * 2) Parse into various fb_info structs
1480 * 3) Allocate virtual framebuffer memory to back highest res mode
1481 *
1482 * Parses EDID into three places used by various parts of fbdev:
1483 * fb_var_screeninfo contains the timing of the monitor's preferred mode
1484 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb
1485 * fb_info.modelist is a linked list of all monitor & VESA modes which work
1486 *
1487 * If EDID is not readable/valid, then modelist is all VESA modes,
1488 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
1489 * Returns 0 if successful */
1490 static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info,
1491 char *default_edid, size_t default_edid_size)
1492 {
1493 const struct fb_videomode *default_vmode = NULL;
1494 u8 *edid;
1495 int i, result = 0, tries = 3;
1496
1497 if (info->dev) /* only use mutex if info has been registered */
1498 mutex_lock(&info->lock);
1499
1500 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
1501 if (!edid) {
1502 result = -ENOMEM;
1503 goto error;
1504 }
1505
1506 fb_destroy_modelist(&info->modelist);
1507 memset(&info->monspecs, 0, sizeof(info->monspecs));
1508
1509 /* Try to (re)read EDID from hardware first
1510 * EDID data may return, but not parse as valid
1511 * Try again a few times, in case of e.g. analog cable noise */
1512 while (tries--) {
1513 i = ufx_read_edid(dev, edid, EDID_LENGTH);
1514
1515 if (i >= EDID_LENGTH)
1516 fb_edid_to_monspecs(edid, &info->monspecs);
1517
1518 if (info->monspecs.modedb_len > 0) {
1519 dev->edid = edid;
1520 dev->edid_size = i;
1521 break;
1522 }
1523 }
1524
1525 /* If that fails, use a previously returned EDID if available */
1526 if (info->monspecs.modedb_len == 0) {
1527 pr_err("Unable to get valid EDID from device/display\n");
1528
1529 if (dev->edid) {
1530 fb_edid_to_monspecs(dev->edid, &info->monspecs);
1531 if (info->monspecs.modedb_len > 0)
1532 pr_err("Using previously queried EDID\n");
1533 }
1534 }
1535
1536 /* If that fails, use the default EDID we were handed */
1537 if (info->monspecs.modedb_len == 0) {
1538 if (default_edid_size >= EDID_LENGTH) {
1539 fb_edid_to_monspecs(default_edid, &info->monspecs);
1540 if (info->monspecs.modedb_len > 0) {
1541 memcpy(edid, default_edid, default_edid_size);
1542 dev->edid = edid;
1543 dev->edid_size = default_edid_size;
1544 pr_err("Using default/backup EDID\n");
1545 }
1546 }
1547 }
1548
1549 /* If we've got modes, let's pick a best default mode */
1550 if (info->monspecs.modedb_len > 0) {
1551
1552 for (i = 0; i < info->monspecs.modedb_len; i++) {
1553 if (ufx_is_valid_mode(&info->monspecs.modedb[i], info))
1554 fb_add_videomode(&info->monspecs.modedb[i],
1555 &info->modelist);
1556 else /* if we've removed top/best mode */
1557 info->monspecs.misc &= ~FB_MISC_1ST_DETAIL;
1558 }
1559
1560 default_vmode = fb_find_best_display(&info->monspecs,
1561 &info->modelist);
1562 }
1563
1564 /* If everything else has failed, fall back to safe default mode */
1565 if (default_vmode == NULL) {
1566
1567 struct fb_videomode fb_vmode = {0};
1568
1569 /* Add the standard VESA modes to our modelist
1570 * Since we don't have EDID, there may be modes that
1571 * overspec monitor and/or are incorrect aspect ratio, etc.
1572 * But at least the user has a chance to choose
1573 */
1574 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
1575 if (ufx_is_valid_mode((struct fb_videomode *)
1576 &vesa_modes[i], info))
1577 fb_add_videomode(&vesa_modes[i],
1578 &info->modelist);
1579 }
1580
1581 /* default to resolution safe for projectors
1582 * (since they are most common case without EDID)
1583 */
1584 fb_vmode.xres = 800;
1585 fb_vmode.yres = 600;
1586 fb_vmode.refresh = 60;
1587 default_vmode = fb_find_nearest_mode(&fb_vmode,
1588 &info->modelist);
1589 }
1590
1591 /* If we have good mode and no active clients */
1592 if ((default_vmode != NULL) && (dev->fb_count == 0)) {
1593
1594 fb_videomode_to_var(&info->var, default_vmode);
1595 ufx_var_color_format(&info->var);
1596
1597 /* with mode size info, we can now alloc our framebuffer */
1598 memcpy(&info->fix, &ufx_fix, sizeof(ufx_fix));
1599 info->fix.line_length = info->var.xres *
1600 (info->var.bits_per_pixel / 8);
1601
1602 result = ufx_realloc_framebuffer(dev, info);
1603
1604 } else
1605 result = -EINVAL;
1606
1607 error:
1608 if (edid && (dev->edid != edid))
1609 kfree(edid);
1610
1611 if (info->dev)
1612 mutex_unlock(&info->lock);
1613
1614 return result;
1615 }
1616
1617 static int ufx_usb_probe(struct usb_interface *interface,
1618 const struct usb_device_id *id)
1619 {
1620 struct usb_device *usbdev;
1621 struct ufx_data *dev;
1622 struct fb_info *info = 0;
1623 int retval = -ENOMEM;
1624 u32 id_rev, fpga_rev;
1625
1626 /* usb initialization */
1627 usbdev = interface_to_usbdev(interface);
1628 BUG_ON(!usbdev);
1629
1630 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1631 if (dev == NULL) {
1632 dev_err(&usbdev->dev, "ufx_usb_probe: failed alloc of dev struct\n");
1633 goto error;
1634 }
1635
1636 /* we need to wait for both usb and fbdev to spin down on disconnect */
1637 kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */
1638 kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */
1639
1640 dev->udev = usbdev;
1641 dev->gdev = &usbdev->dev; /* our generic struct device * */
1642 usb_set_intfdata(interface, dev);
1643
1644 dev_dbg(dev->gdev, "%s %s - serial #%s\n",
1645 usbdev->manufacturer, usbdev->product, usbdev->serial);
1646 dev_dbg(dev->gdev, "vid_%04x&pid_%04x&rev_%04x driver's ufx_data struct at %p\n",
1647 usbdev->descriptor.idVendor, usbdev->descriptor.idProduct,
1648 usbdev->descriptor.bcdDevice, dev);
1649 dev_dbg(dev->gdev, "console enable=%d\n", console);
1650 dev_dbg(dev->gdev, "fb_defio enable=%d\n", fb_defio);
1651
1652 if (!ufx_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
1653 retval = -ENOMEM;
1654 dev_err(dev->gdev, "ufx_alloc_urb_list failed\n");
1655 goto error;
1656 }
1657
1658 /* We don't register a new USB class. Our client interface is fbdev */
1659
1660 /* allocates framebuffer driver structure, not framebuffer memory */
1661 info = framebuffer_alloc(0, &usbdev->dev);
1662 if (!info) {
1663 retval = -ENOMEM;
1664 dev_err(dev->gdev, "framebuffer_alloc failed\n");
1665 goto error;
1666 }
1667
1668 dev->info = info;
1669 info->par = dev;
1670 info->pseudo_palette = dev->pseudo_palette;
1671 info->fbops = &ufx_ops;
1672
1673 retval = fb_alloc_cmap(&info->cmap, 256, 0);
1674 if (retval < 0) {
1675 dev_err(dev->gdev, "fb_alloc_cmap failed %x\n", retval);
1676 goto error;
1677 }
1678
1679 INIT_DELAYED_WORK(&dev->free_framebuffer_work,
1680 ufx_free_framebuffer_work);
1681
1682 INIT_LIST_HEAD(&info->modelist);
1683
1684 retval = ufx_reg_read(dev, 0x3000, &id_rev);
1685 check_warn_goto_error(retval, "error %d reading 0x3000 register from device", retval);
1686 dev_dbg(dev->gdev, "ID_REV register value 0x%08x", id_rev);
1687
1688 retval = ufx_reg_read(dev, 0x3004, &fpga_rev);
1689 check_warn_goto_error(retval, "error %d reading 0x3004 register from device", retval);
1690 dev_dbg(dev->gdev, "FPGA_REV register value 0x%08x", fpga_rev);
1691
1692 dev_dbg(dev->gdev, "resetting device");
1693 retval = ufx_lite_reset(dev);
1694 check_warn_goto_error(retval, "error %d resetting device", retval);
1695
1696 dev_dbg(dev->gdev, "configuring system clock");
1697 retval = ufx_config_sys_clk(dev);
1698 check_warn_goto_error(retval, "error %d configuring system clock", retval);
1699
1700 dev_dbg(dev->gdev, "configuring DDR2 controller");
1701 retval = ufx_config_ddr2(dev);
1702 check_warn_goto_error(retval, "error %d initialising DDR2 controller", retval);
1703
1704 dev_dbg(dev->gdev, "configuring I2C controller");
1705 retval = ufx_i2c_init(dev);
1706 check_warn_goto_error(retval, "error %d initialising I2C controller", retval);
1707
1708 dev_dbg(dev->gdev, "selecting display mode");
1709 retval = ufx_setup_modes(dev, info, NULL, 0);
1710 check_warn_goto_error(retval, "unable to find common mode for display and adapter");
1711
1712 retval = ufx_reg_set_bits(dev, 0x4000, 0x00000001);
1713 check_warn_goto_error(retval, "error %d enabling graphics engine", retval);
1714
1715 /* ready to begin using device */
1716 atomic_set(&dev->usb_active, 1);
1717
1718 dev_dbg(dev->gdev, "checking var");
1719 retval = ufx_ops_check_var(&info->var, info);
1720 check_warn_goto_error(retval, "error %d ufx_ops_check_var", retval);
1721
1722 dev_dbg(dev->gdev, "setting par");
1723 retval = ufx_ops_set_par(info);
1724 check_warn_goto_error(retval, "error %d ufx_ops_set_par", retval);
1725
1726 dev_dbg(dev->gdev, "registering framebuffer");
1727 retval = register_framebuffer(info);
1728 check_warn_goto_error(retval, "error %d register_framebuffer", retval);
1729
1730 dev_info(dev->gdev, "SMSC UDX USB device /dev/fb%d attached. %dx%d resolution."
1731 " Using %dK framebuffer memory\n", info->node,
1732 info->var.xres, info->var.yres, info->fix.smem_len >> 10);
1733
1734 return 0;
1735
1736 error:
1737 if (dev) {
1738 if (info) {
1739 if (info->cmap.len != 0)
1740 fb_dealloc_cmap(&info->cmap);
1741 if (info->monspecs.modedb)
1742 fb_destroy_modedb(info->monspecs.modedb);
1743 if (info->screen_base)
1744 vfree(info->screen_base);
1745
1746 fb_destroy_modelist(&info->modelist);
1747
1748 framebuffer_release(info);
1749 }
1750
1751 kref_put(&dev->kref, ufx_free); /* ref for framebuffer */
1752 kref_put(&dev->kref, ufx_free); /* last ref from kref_init */
1753
1754 /* dev has been deallocated. Do not dereference */
1755 }
1756
1757 return retval;
1758 }
1759
1760 static void ufx_usb_disconnect(struct usb_interface *interface)
1761 {
1762 struct ufx_data *dev;
1763 struct fb_info *info;
1764
1765 dev = usb_get_intfdata(interface);
1766 info = dev->info;
1767
1768 pr_debug("USB disconnect starting\n");
1769
1770 /* we virtualize until all fb clients release. Then we free */
1771 dev->virtualized = true;
1772
1773 /* When non-active we'll update virtual framebuffer, but no new urbs */
1774 atomic_set(&dev->usb_active, 0);
1775
1776 usb_set_intfdata(interface, NULL);
1777
1778 /* if clients still have us open, will be freed on last close */
1779 if (dev->fb_count == 0)
1780 schedule_delayed_work(&dev->free_framebuffer_work, 0);
1781
1782 /* release reference taken by kref_init in probe() */
1783 kref_put(&dev->kref, ufx_free);
1784
1785 /* consider ufx_data freed */
1786 }
1787
1788 static struct usb_driver ufx_driver = {
1789 .name = "smscufx",
1790 .probe = ufx_usb_probe,
1791 .disconnect = ufx_usb_disconnect,
1792 .id_table = id_table,
1793 };
1794
1795 static int __init ufx_module_init(void)
1796 {
1797 int res;
1798
1799 res = usb_register(&ufx_driver);
1800 if (res)
1801 err("usb_register failed. Error number %d", res);
1802
1803 return res;
1804 }
1805
1806 static void __exit ufx_module_exit(void)
1807 {
1808 usb_deregister(&ufx_driver);
1809 }
1810
1811 module_init(ufx_module_init);
1812 module_exit(ufx_module_exit);
1813
1814 static void ufx_urb_completion(struct urb *urb)
1815 {
1816 struct urb_node *unode = urb->context;
1817 struct ufx_data *dev = unode->dev;
1818 unsigned long flags;
1819
1820 /* sync/async unlink faults aren't errors */
1821 if (urb->status) {
1822 if (!(urb->status == -ENOENT ||
1823 urb->status == -ECONNRESET ||
1824 urb->status == -ESHUTDOWN)) {
1825 pr_err("%s - nonzero write bulk status received: %d\n",
1826 __func__, urb->status);
1827 atomic_set(&dev->lost_pixels, 1);
1828 }
1829 }
1830
1831 urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */
1832
1833 spin_lock_irqsave(&dev->urbs.lock, flags);
1834 list_add_tail(&unode->entry, &dev->urbs.list);
1835 dev->urbs.available++;
1836 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1837
1838 /* When using fb_defio, we deadlock if up() is called
1839 * while another is waiting. So queue to another process */
1840 if (fb_defio)
1841 schedule_delayed_work(&unode->release_urb_work, 0);
1842 else
1843 up(&dev->urbs.limit_sem);
1844 }
1845
1846 static void ufx_free_urb_list(struct ufx_data *dev)
1847 {
1848 int count = dev->urbs.count;
1849 struct list_head *node;
1850 struct urb_node *unode;
1851 struct urb *urb;
1852 int ret;
1853 unsigned long flags;
1854
1855 pr_debug("Waiting for completes and freeing all render urbs\n");
1856
1857 /* keep waiting and freeing, until we've got 'em all */
1858 while (count--) {
1859 /* Getting interrupted means a leak, but ok at shutdown*/
1860 ret = down_interruptible(&dev->urbs.limit_sem);
1861 if (ret)
1862 break;
1863
1864 spin_lock_irqsave(&dev->urbs.lock, flags);
1865
1866 node = dev->urbs.list.next; /* have reserved one with sem */
1867 list_del_init(node);
1868
1869 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1870
1871 unode = list_entry(node, struct urb_node, entry);
1872 urb = unode->urb;
1873
1874 /* Free each separately allocated piece */
1875 usb_free_coherent(urb->dev, dev->urbs.size,
1876 urb->transfer_buffer, urb->transfer_dma);
1877 usb_free_urb(urb);
1878 kfree(node);
1879 }
1880 }
1881
1882 static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size)
1883 {
1884 int i = 0;
1885 struct urb *urb;
1886 struct urb_node *unode;
1887 char *buf;
1888
1889 spin_lock_init(&dev->urbs.lock);
1890
1891 dev->urbs.size = size;
1892 INIT_LIST_HEAD(&dev->urbs.list);
1893
1894 while (i < count) {
1895 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
1896 if (!unode)
1897 break;
1898 unode->dev = dev;
1899
1900 INIT_DELAYED_WORK(&unode->release_urb_work,
1901 ufx_release_urb_work);
1902
1903 urb = usb_alloc_urb(0, GFP_KERNEL);
1904 if (!urb) {
1905 kfree(unode);
1906 break;
1907 }
1908 unode->urb = urb;
1909
1910 buf = usb_alloc_coherent(dev->udev, size, GFP_KERNEL,
1911 &urb->transfer_dma);
1912 if (!buf) {
1913 kfree(unode);
1914 usb_free_urb(urb);
1915 break;
1916 }
1917
1918 /* urb->transfer_buffer_length set to actual before submit */
1919 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1),
1920 buf, size, ufx_urb_completion, unode);
1921 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1922
1923 list_add_tail(&unode->entry, &dev->urbs.list);
1924
1925 i++;
1926 }
1927
1928 sema_init(&dev->urbs.limit_sem, i);
1929 dev->urbs.count = i;
1930 dev->urbs.available = i;
1931
1932 pr_debug("allocated %d %d byte urbs\n", i, (int) size);
1933
1934 return i;
1935 }
1936
1937 static struct urb *ufx_get_urb(struct ufx_data *dev)
1938 {
1939 int ret = 0;
1940 struct list_head *entry;
1941 struct urb_node *unode;
1942 struct urb *urb = NULL;
1943 unsigned long flags;
1944
1945 /* Wait for an in-flight buffer to complete and get re-queued */
1946 ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT);
1947 if (ret) {
1948 atomic_set(&dev->lost_pixels, 1);
1949 pr_warn("wait for urb interrupted: %x available: %d\n",
1950 ret, dev->urbs.available);
1951 goto error;
1952 }
1953
1954 spin_lock_irqsave(&dev->urbs.lock, flags);
1955
1956 BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */
1957 entry = dev->urbs.list.next;
1958 list_del_init(entry);
1959 dev->urbs.available--;
1960
1961 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1962
1963 unode = list_entry(entry, struct urb_node, entry);
1964 urb = unode->urb;
1965
1966 error:
1967 return urb;
1968 }
1969
1970 static int ufx_submit_urb(struct ufx_data *dev, struct urb *urb, size_t len)
1971 {
1972 int ret;
1973
1974 BUG_ON(len > dev->urbs.size);
1975
1976 urb->transfer_buffer_length = len; /* set to actual payload len */
1977 ret = usb_submit_urb(urb, GFP_KERNEL);
1978 if (ret) {
1979 ufx_urb_completion(urb); /* because no one else will */
1980 atomic_set(&dev->lost_pixels, 1);
1981 pr_err("usb_submit_urb error %x\n", ret);
1982 }
1983 return ret;
1984 }
1985
1986 module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1987 MODULE_PARM_DESC(console, "Allow fbcon to be used on this display");
1988
1989 module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1990 MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support");
1991
1992 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@smsc.com>");
1993 MODULE_DESCRIPTION("SMSC UFX kernel framebuffer driver");
1994 MODULE_LICENSE("GPL");