1 /* 2 * smscufx.c -- Framebuffer driver for SMSC UFX USB controller 3 * 4 * Copyright (C) 2011 Steve Glendinning <steve.glendinning@shawell.net> 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 const 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 bool console; /* Optionally allow fbcon to consume first framebuffer */ 134 static bool 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 (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) 786 return -EINVAL; 787 if (size > info->fix.smem_len) 788 return -EINVAL; 789 if (offset > info->fix.smem_len - size) 790 return -EINVAL; 791 792 pos = (unsigned long)info->fix.smem_start + offset; 793 794 pr_debug("mmap() framebuffer addr:%lu size:%lu\n", 795 pos, size); 796 797 while (size > 0) { 798 page = vmalloc_to_pfn((void *)pos); 799 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) 800 return -EAGAIN; 801 802 start += PAGE_SIZE; 803 pos += PAGE_SIZE; 804 if (size > PAGE_SIZE) 805 size -= PAGE_SIZE; 806 else 807 size = 0; 808 } 809 810 return 0; 811 } 812 813 static void ufx_raw_rect(struct ufx_data *dev, u16 *cmd, int x, int y, 814 int width, int height) 815 { 816 size_t packed_line_len = ALIGN((width * 2), 4); 817 size_t packed_rect_len = packed_line_len * height; 818 int line; 819 820 BUG_ON(!dev); 821 BUG_ON(!dev->info); 822 823 /* command word */ 824 *((u32 *)&cmd[0]) = cpu_to_le32(0x01); 825 826 /* length word */ 827 *((u32 *)&cmd[2]) = cpu_to_le32(packed_rect_len + 16); 828 829 cmd[4] = cpu_to_le16(x); 830 cmd[5] = cpu_to_le16(y); 831 cmd[6] = cpu_to_le16(width); 832 cmd[7] = cpu_to_le16(height); 833 834 /* frame base address */ 835 *((u32 *)&cmd[8]) = cpu_to_le32(0); 836 837 /* color mode and horizontal resolution */ 838 cmd[10] = cpu_to_le16(0x4000 | dev->info->var.xres); 839 840 /* vertical resolution */ 841 cmd[11] = cpu_to_le16(dev->info->var.yres); 842 843 /* packed data */ 844 for (line = 0; line < height; line++) { 845 const int line_offset = dev->info->fix.line_length * (y + line); 846 const int byte_offset = line_offset + (x * BPP); 847 memcpy(&cmd[(24 + (packed_line_len * line)) / 2], 848 (char *)dev->info->fix.smem_start + byte_offset, width * BPP); 849 } 850 } 851 852 static int ufx_handle_damage(struct ufx_data *dev, int x, int y, 853 int width, int height) 854 { 855 size_t packed_line_len = ALIGN((width * 2), 4); 856 int len, status, urb_lines, start_line = 0; 857 858 if ((width <= 0) || (height <= 0) || 859 (x + width > dev->info->var.xres) || 860 (y + height > dev->info->var.yres)) 861 return -EINVAL; 862 863 if (!atomic_read(&dev->usb_active)) 864 return 0; 865 866 while (start_line < height) { 867 struct urb *urb = ufx_get_urb(dev); 868 if (!urb) { 869 pr_warn("ufx_handle_damage unable to get urb"); 870 return 0; 871 } 872 873 /* assume we have enough space to transfer at least one line */ 874 BUG_ON(urb->transfer_buffer_length < (24 + (width * 2))); 875 876 /* calculate the maximum number of lines we could fit in */ 877 urb_lines = (urb->transfer_buffer_length - 24) / packed_line_len; 878 879 /* but we might not need this many */ 880 urb_lines = min(urb_lines, (height - start_line)); 881 882 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 883 884 ufx_raw_rect(dev, urb->transfer_buffer, x, (y + start_line), width, urb_lines); 885 len = 24 + (packed_line_len * urb_lines); 886 887 status = ufx_submit_urb(dev, urb, len); 888 check_warn_return(status, "Error submitting URB"); 889 890 start_line += urb_lines; 891 } 892 893 return 0; 894 } 895 896 /* Path triggered by usermode clients who write to filesystem 897 * e.g. cat filename > /dev/fb1 898 * Not used by X Windows or text-mode console. But useful for testing. 899 * Slow because of extra copy and we must assume all pixels dirty. */ 900 static ssize_t ufx_ops_write(struct fb_info *info, const char __user *buf, 901 size_t count, loff_t *ppos) 902 { 903 ssize_t result; 904 struct ufx_data *dev = info->par; 905 u32 offset = (u32) *ppos; 906 907 result = fb_sys_write(info, buf, count, ppos); 908 909 if (result > 0) { 910 int start = max((int)(offset / info->fix.line_length), 0); 911 int lines = min((u32)((result / info->fix.line_length) + 1), 912 (u32)info->var.yres); 913 914 ufx_handle_damage(dev, 0, start, info->var.xres, lines); 915 } 916 917 return result; 918 } 919 920 static void ufx_ops_copyarea(struct fb_info *info, 921 const struct fb_copyarea *area) 922 { 923 924 struct ufx_data *dev = info->par; 925 926 sys_copyarea(info, area); 927 928 ufx_handle_damage(dev, area->dx, area->dy, 929 area->width, area->height); 930 } 931 932 static void ufx_ops_imageblit(struct fb_info *info, 933 const struct fb_image *image) 934 { 935 struct ufx_data *dev = info->par; 936 937 sys_imageblit(info, image); 938 939 ufx_handle_damage(dev, image->dx, image->dy, 940 image->width, image->height); 941 } 942 943 static void ufx_ops_fillrect(struct fb_info *info, 944 const struct fb_fillrect *rect) 945 { 946 struct ufx_data *dev = info->par; 947 948 sys_fillrect(info, rect); 949 950 ufx_handle_damage(dev, rect->dx, rect->dy, rect->width, 951 rect->height); 952 } 953 954 /* NOTE: fb_defio.c is holding info->fbdefio.mutex 955 * Touching ANY framebuffer memory that triggers a page fault 956 * in fb_defio will cause a deadlock, when it also tries to 957 * grab the same mutex. */ 958 static void ufx_dpy_deferred_io(struct fb_info *info, 959 struct list_head *pagelist) 960 { 961 struct page *cur; 962 struct fb_deferred_io *fbdefio = info->fbdefio; 963 struct ufx_data *dev = info->par; 964 965 if (!fb_defio) 966 return; 967 968 if (!atomic_read(&dev->usb_active)) 969 return; 970 971 /* walk the written page list and render each to device */ 972 list_for_each_entry(cur, &fbdefio->pagelist, lru) { 973 /* create a rectangle of full screen width that encloses the 974 * entire dirty framebuffer page */ 975 const int x = 0; 976 const int width = dev->info->var.xres; 977 const int y = (cur->index << PAGE_SHIFT) / (width * 2); 978 int height = (PAGE_SIZE / (width * 2)) + 1; 979 height = min(height, (int)(dev->info->var.yres - y)); 980 981 BUG_ON(y >= dev->info->var.yres); 982 BUG_ON((y + height) > dev->info->var.yres); 983 984 ufx_handle_damage(dev, x, y, width, height); 985 } 986 } 987 988 static int ufx_ops_ioctl(struct fb_info *info, unsigned int cmd, 989 unsigned long arg) 990 { 991 struct ufx_data *dev = info->par; 992 struct dloarea *area = NULL; 993 994 if (!atomic_read(&dev->usb_active)) 995 return 0; 996 997 /* TODO: Update X server to get this from sysfs instead */ 998 if (cmd == UFX_IOCTL_RETURN_EDID) { 999 u8 __user *edid = (u8 __user *)arg; 1000 if (copy_to_user(edid, dev->edid, dev->edid_size)) 1001 return -EFAULT; 1002 return 0; 1003 } 1004 1005 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ 1006 if (cmd == UFX_IOCTL_REPORT_DAMAGE) { 1007 /* If we have a damage-aware client, turn fb_defio "off" 1008 * To avoid perf imact of unnecessary page fault handling. 1009 * Done by resetting the delay for this fb_info to a very 1010 * long period. Pages will become writable and stay that way. 1011 * Reset to normal value when all clients have closed this fb. 1012 */ 1013 if (info->fbdefio) 1014 info->fbdefio->delay = UFX_DEFIO_WRITE_DISABLE; 1015 1016 area = (struct dloarea *)arg; 1017 1018 if (area->x < 0) 1019 area->x = 0; 1020 1021 if (area->x > info->var.xres) 1022 area->x = info->var.xres; 1023 1024 if (area->y < 0) 1025 area->y = 0; 1026 1027 if (area->y > info->var.yres) 1028 area->y = info->var.yres; 1029 1030 ufx_handle_damage(dev, area->x, area->y, area->w, area->h); 1031 } 1032 1033 return 0; 1034 } 1035 1036 /* taken from vesafb */ 1037 static int 1038 ufx_ops_setcolreg(unsigned regno, unsigned red, unsigned green, 1039 unsigned blue, unsigned transp, struct fb_info *info) 1040 { 1041 int err = 0; 1042 1043 if (regno >= info->cmap.len) 1044 return 1; 1045 1046 if (regno < 16) { 1047 if (info->var.red.offset == 10) { 1048 /* 1:5:5:5 */ 1049 ((u32 *) (info->pseudo_palette))[regno] = 1050 ((red & 0xf800) >> 1) | 1051 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); 1052 } else { 1053 /* 0:5:6:5 */ 1054 ((u32 *) (info->pseudo_palette))[regno] = 1055 ((red & 0xf800)) | 1056 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); 1057 } 1058 } 1059 1060 return err; 1061 } 1062 1063 /* It's common for several clients to have framebuffer open simultaneously. 1064 * e.g. both fbcon and X. Makes things interesting. 1065 * Assumes caller is holding info->lock (for open and release at least) */ 1066 static int ufx_ops_open(struct fb_info *info, int user) 1067 { 1068 struct ufx_data *dev = info->par; 1069 1070 /* fbcon aggressively connects to first framebuffer it finds, 1071 * preventing other clients (X) from working properly. Usually 1072 * not what the user wants. Fail by default with option to enable. */ 1073 if (user == 0 && !console) 1074 return -EBUSY; 1075 1076 /* If the USB device is gone, we don't accept new opens */ 1077 if (dev->virtualized) 1078 return -ENODEV; 1079 1080 dev->fb_count++; 1081 1082 kref_get(&dev->kref); 1083 1084 if (fb_defio && (info->fbdefio == NULL)) { 1085 /* enable defio at last moment if not disabled by client */ 1086 1087 struct fb_deferred_io *fbdefio; 1088 1089 fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL); 1090 if (fbdefio) { 1091 fbdefio->delay = UFX_DEFIO_WRITE_DELAY; 1092 fbdefio->deferred_io = ufx_dpy_deferred_io; 1093 } 1094 1095 info->fbdefio = fbdefio; 1096 fb_deferred_io_init(info); 1097 } 1098 1099 pr_debug("open /dev/fb%d user=%d fb_info=%p count=%d", 1100 info->node, user, info, dev->fb_count); 1101 1102 return 0; 1103 } 1104 1105 /* 1106 * Called when all client interfaces to start transactions have been disabled, 1107 * and all references to our device instance (ufx_data) are released. 1108 * Every transaction must have a reference, so we know are fully spun down 1109 */ 1110 static void ufx_free(struct kref *kref) 1111 { 1112 struct ufx_data *dev = container_of(kref, struct ufx_data, kref); 1113 1114 /* this function will wait for all in-flight urbs to complete */ 1115 if (dev->urbs.count > 0) 1116 ufx_free_urb_list(dev); 1117 1118 pr_debug("freeing ufx_data %p", dev); 1119 1120 kfree(dev); 1121 } 1122 1123 static void ufx_release_urb_work(struct work_struct *work) 1124 { 1125 struct urb_node *unode = container_of(work, struct urb_node, 1126 release_urb_work.work); 1127 1128 up(&unode->dev->urbs.limit_sem); 1129 } 1130 1131 static void ufx_free_framebuffer_work(struct work_struct *work) 1132 { 1133 struct ufx_data *dev = container_of(work, struct ufx_data, 1134 free_framebuffer_work.work); 1135 struct fb_info *info = dev->info; 1136 int node = info->node; 1137 1138 unregister_framebuffer(info); 1139 1140 if (info->cmap.len != 0) 1141 fb_dealloc_cmap(&info->cmap); 1142 if (info->monspecs.modedb) 1143 fb_destroy_modedb(info->monspecs.modedb); 1144 vfree(info->screen_base); 1145 1146 fb_destroy_modelist(&info->modelist); 1147 1148 dev->info = NULL; 1149 1150 /* Assume info structure is freed after this point */ 1151 framebuffer_release(info); 1152 1153 pr_debug("fb_info for /dev/fb%d has been freed", node); 1154 1155 /* ref taken in probe() as part of registering framebfufer */ 1156 kref_put(&dev->kref, ufx_free); 1157 } 1158 1159 /* 1160 * Assumes caller is holding info->lock mutex (for open and release at least) 1161 */ 1162 static int ufx_ops_release(struct fb_info *info, int user) 1163 { 1164 struct ufx_data *dev = info->par; 1165 1166 dev->fb_count--; 1167 1168 /* We can't free fb_info here - fbmem will touch it when we return */ 1169 if (dev->virtualized && (dev->fb_count == 0)) 1170 schedule_delayed_work(&dev->free_framebuffer_work, HZ); 1171 1172 if ((dev->fb_count == 0) && (info->fbdefio)) { 1173 fb_deferred_io_cleanup(info); 1174 kfree(info->fbdefio); 1175 info->fbdefio = NULL; 1176 info->fbops->fb_mmap = ufx_ops_mmap; 1177 } 1178 1179 pr_debug("released /dev/fb%d user=%d count=%d", 1180 info->node, user, dev->fb_count); 1181 1182 kref_put(&dev->kref, ufx_free); 1183 1184 return 0; 1185 } 1186 1187 /* Check whether a video mode is supported by the chip 1188 * We start from monitor's modes, so don't need to filter that here */ 1189 static int ufx_is_valid_mode(struct fb_videomode *mode, 1190 struct fb_info *info) 1191 { 1192 if ((mode->xres * mode->yres) > (2048 * 1152)) { 1193 pr_debug("%dx%d too many pixels", 1194 mode->xres, mode->yres); 1195 return 0; 1196 } 1197 1198 if (mode->pixclock < 5000) { 1199 pr_debug("%dx%d %dps pixel clock too fast", 1200 mode->xres, mode->yres, mode->pixclock); 1201 return 0; 1202 } 1203 1204 pr_debug("%dx%d (pixclk %dps %dMHz) valid mode", mode->xres, mode->yres, 1205 mode->pixclock, (1000000 / mode->pixclock)); 1206 return 1; 1207 } 1208 1209 static void ufx_var_color_format(struct fb_var_screeninfo *var) 1210 { 1211 const struct fb_bitfield red = { 11, 5, 0 }; 1212 const struct fb_bitfield green = { 5, 6, 0 }; 1213 const struct fb_bitfield blue = { 0, 5, 0 }; 1214 1215 var->bits_per_pixel = 16; 1216 var->red = red; 1217 var->green = green; 1218 var->blue = blue; 1219 } 1220 1221 static int ufx_ops_check_var(struct fb_var_screeninfo *var, 1222 struct fb_info *info) 1223 { 1224 struct fb_videomode mode; 1225 1226 /* TODO: support dynamically changing framebuffer size */ 1227 if ((var->xres * var->yres * 2) > info->fix.smem_len) 1228 return -EINVAL; 1229 1230 /* set device-specific elements of var unrelated to mode */ 1231 ufx_var_color_format(var); 1232 1233 fb_var_to_videomode(&mode, var); 1234 1235 if (!ufx_is_valid_mode(&mode, info)) 1236 return -EINVAL; 1237 1238 return 0; 1239 } 1240 1241 static int ufx_ops_set_par(struct fb_info *info) 1242 { 1243 struct ufx_data *dev = info->par; 1244 int result; 1245 u16 *pix_framebuffer; 1246 int i; 1247 1248 pr_debug("set_par mode %dx%d", info->var.xres, info->var.yres); 1249 result = ufx_set_vid_mode(dev, &info->var); 1250 1251 if ((result == 0) && (dev->fb_count == 0)) { 1252 /* paint greenscreen */ 1253 pix_framebuffer = (u16 *) info->screen_base; 1254 for (i = 0; i < info->fix.smem_len / 2; i++) 1255 pix_framebuffer[i] = 0x37e6; 1256 1257 ufx_handle_damage(dev, 0, 0, info->var.xres, info->var.yres); 1258 } 1259 1260 /* re-enable defio if previously disabled by damage tracking */ 1261 if (info->fbdefio) 1262 info->fbdefio->delay = UFX_DEFIO_WRITE_DELAY; 1263 1264 return result; 1265 } 1266 1267 /* In order to come back from full DPMS off, we need to set the mode again */ 1268 static int ufx_ops_blank(int blank_mode, struct fb_info *info) 1269 { 1270 struct ufx_data *dev = info->par; 1271 ufx_set_vid_mode(dev, &info->var); 1272 return 0; 1273 } 1274 1275 static struct fb_ops ufx_ops = { 1276 .owner = THIS_MODULE, 1277 .fb_read = fb_sys_read, 1278 .fb_write = ufx_ops_write, 1279 .fb_setcolreg = ufx_ops_setcolreg, 1280 .fb_fillrect = ufx_ops_fillrect, 1281 .fb_copyarea = ufx_ops_copyarea, 1282 .fb_imageblit = ufx_ops_imageblit, 1283 .fb_mmap = ufx_ops_mmap, 1284 .fb_ioctl = ufx_ops_ioctl, 1285 .fb_open = ufx_ops_open, 1286 .fb_release = ufx_ops_release, 1287 .fb_blank = ufx_ops_blank, 1288 .fb_check_var = ufx_ops_check_var, 1289 .fb_set_par = ufx_ops_set_par, 1290 }; 1291 1292 /* Assumes &info->lock held by caller 1293 * Assumes no active clients have framebuffer open */ 1294 static int ufx_realloc_framebuffer(struct ufx_data *dev, struct fb_info *info) 1295 { 1296 int retval = -ENOMEM; 1297 int old_len = info->fix.smem_len; 1298 int new_len; 1299 unsigned char *old_fb = info->screen_base; 1300 unsigned char *new_fb; 1301 1302 pr_debug("Reallocating framebuffer. Addresses will change!"); 1303 1304 new_len = info->fix.line_length * info->var.yres; 1305 1306 if (PAGE_ALIGN(new_len) > old_len) { 1307 /* 1308 * Alloc system memory for virtual framebuffer 1309 */ 1310 new_fb = vmalloc(new_len); 1311 if (!new_fb) { 1312 pr_err("Virtual framebuffer alloc failed"); 1313 goto error; 1314 } 1315 1316 if (info->screen_base) { 1317 memcpy(new_fb, old_fb, old_len); 1318 vfree(info->screen_base); 1319 } 1320 1321 info->screen_base = new_fb; 1322 info->fix.smem_len = PAGE_ALIGN(new_len); 1323 info->fix.smem_start = (unsigned long) new_fb; 1324 info->flags = smscufx_info_flags; 1325 } 1326 1327 retval = 0; 1328 1329 error: 1330 return retval; 1331 } 1332 1333 /* sets up I2C Controller for 100 Kbps, std. speed, 7-bit addr, master, 1334 * restart enabled, but no start byte, enable controller */ 1335 static int ufx_i2c_init(struct ufx_data *dev) 1336 { 1337 u32 tmp; 1338 1339 /* disable the controller before it can be reprogrammed */ 1340 int status = ufx_reg_write(dev, 0x106C, 0x00); 1341 check_warn_return(status, "failed to disable I2C"); 1342 1343 /* Setup the clock count registers 1344 * (12+1) = 13 clks @ 2.5 MHz = 5.2 uS */ 1345 status = ufx_reg_write(dev, 0x1018, 12); 1346 check_warn_return(status, "error writing 0x1018"); 1347 1348 /* (6+8) = 14 clks @ 2.5 MHz = 5.6 uS */ 1349 status = ufx_reg_write(dev, 0x1014, 6); 1350 check_warn_return(status, "error writing 0x1014"); 1351 1352 status = ufx_reg_read(dev, 0x1000, &tmp); 1353 check_warn_return(status, "error reading 0x1000"); 1354 1355 /* set speed to std mode */ 1356 tmp &= ~(0x06); 1357 tmp |= 0x02; 1358 1359 /* 7-bit (not 10-bit) addressing */ 1360 tmp &= ~(0x10); 1361 1362 /* enable restart conditions and master mode */ 1363 tmp |= 0x21; 1364 1365 status = ufx_reg_write(dev, 0x1000, tmp); 1366 check_warn_return(status, "error writing 0x1000"); 1367 1368 /* Set normal tx using target address 0 */ 1369 status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0xC00, 0x000); 1370 check_warn_return(status, "error setting TX mode bits in 0x1004"); 1371 1372 /* Enable the controller */ 1373 status = ufx_reg_write(dev, 0x106C, 0x01); 1374 check_warn_return(status, "failed to enable I2C"); 1375 1376 return 0; 1377 } 1378 1379 /* sets the I2C port mux and target address */ 1380 static int ufx_i2c_configure(struct ufx_data *dev) 1381 { 1382 int status = ufx_reg_write(dev, 0x106C, 0x00); 1383 check_warn_return(status, "failed to disable I2C"); 1384 1385 status = ufx_reg_write(dev, 0x3010, 0x00000000); 1386 check_warn_return(status, "failed to write 0x3010"); 1387 1388 /* A0h is std for any EDID, right shifted by one */ 1389 status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0x3FF, (0xA0 >> 1)); 1390 check_warn_return(status, "failed to set TAR bits in 0x1004"); 1391 1392 status = ufx_reg_write(dev, 0x106C, 0x01); 1393 check_warn_return(status, "failed to enable I2C"); 1394 1395 return 0; 1396 } 1397 1398 /* wait for BUSY to clear, with a timeout of 50ms with 10ms sleeps. if no 1399 * monitor is connected, there is no error except for timeout */ 1400 static int ufx_i2c_wait_busy(struct ufx_data *dev) 1401 { 1402 u32 tmp; 1403 int i, status; 1404 1405 for (i = 0; i < 15; i++) { 1406 status = ufx_reg_read(dev, 0x1100, &tmp); 1407 check_warn_return(status, "0x1100 read failed"); 1408 1409 /* if BUSY is clear, check for error */ 1410 if ((tmp & 0x80000000) == 0) { 1411 if (tmp & 0x20000000) { 1412 pr_warn("I2C read failed, 0x1100=0x%08x", tmp); 1413 return -EIO; 1414 } 1415 1416 return 0; 1417 } 1418 1419 /* perform the first 10 retries without delay */ 1420 if (i >= 10) 1421 msleep(10); 1422 } 1423 1424 pr_warn("I2C access timed out, resetting I2C hardware"); 1425 status = ufx_reg_write(dev, 0x1100, 0x40000000); 1426 check_warn_return(status, "0x1100 write failed"); 1427 1428 return -ETIMEDOUT; 1429 } 1430 1431 /* reads a 128-byte EDID block from the currently selected port and TAR */ 1432 static int ufx_read_edid(struct ufx_data *dev, u8 *edid, int edid_len) 1433 { 1434 int i, j, status; 1435 u32 *edid_u32 = (u32 *)edid; 1436 1437 BUG_ON(edid_len != EDID_LENGTH); 1438 1439 status = ufx_i2c_configure(dev); 1440 if (status < 0) { 1441 pr_err("ufx_i2c_configure failed"); 1442 return status; 1443 } 1444 1445 memset(edid, 0xff, EDID_LENGTH); 1446 1447 /* Read the 128-byte EDID as 2 bursts of 64 bytes */ 1448 for (i = 0; i < 2; i++) { 1449 u32 temp = 0x28070000 | (63 << 20) | (((u32)(i * 64)) << 8); 1450 status = ufx_reg_write(dev, 0x1100, temp); 1451 check_warn_return(status, "Failed to write 0x1100"); 1452 1453 temp |= 0x80000000; 1454 status = ufx_reg_write(dev, 0x1100, temp); 1455 check_warn_return(status, "Failed to write 0x1100"); 1456 1457 status = ufx_i2c_wait_busy(dev); 1458 check_warn_return(status, "Timeout waiting for I2C BUSY to clear"); 1459 1460 for (j = 0; j < 16; j++) { 1461 u32 data_reg_addr = 0x1110 + (j * 4); 1462 status = ufx_reg_read(dev, data_reg_addr, edid_u32++); 1463 check_warn_return(status, "Error reading i2c data"); 1464 } 1465 } 1466 1467 /* all FF's in the first 16 bytes indicates nothing is connected */ 1468 for (i = 0; i < 16; i++) { 1469 if (edid[i] != 0xFF) { 1470 pr_debug("edid data read successfully"); 1471 return EDID_LENGTH; 1472 } 1473 } 1474 1475 pr_warn("edid data contains all 0xff"); 1476 return -ETIMEDOUT; 1477 } 1478 1479 /* 1) use sw default 1480 * 2) Parse into various fb_info structs 1481 * 3) Allocate virtual framebuffer memory to back highest res mode 1482 * 1483 * Parses EDID into three places used by various parts of fbdev: 1484 * fb_var_screeninfo contains the timing of the monitor's preferred mode 1485 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb 1486 * fb_info.modelist is a linked list of all monitor & VESA modes which work 1487 * 1488 * If EDID is not readable/valid, then modelist is all VESA modes, 1489 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode 1490 * Returns 0 if successful */ 1491 static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info, 1492 char *default_edid, size_t default_edid_size) 1493 { 1494 const struct fb_videomode *default_vmode = NULL; 1495 u8 *edid; 1496 int i, result = 0, tries = 3; 1497 1498 if (info->dev) /* only use mutex if info has been registered */ 1499 mutex_lock(&info->lock); 1500 1501 edid = kmalloc(EDID_LENGTH, GFP_KERNEL); 1502 if (!edid) { 1503 result = -ENOMEM; 1504 goto error; 1505 } 1506 1507 fb_destroy_modelist(&info->modelist); 1508 memset(&info->monspecs, 0, sizeof(info->monspecs)); 1509 1510 /* Try to (re)read EDID from hardware first 1511 * EDID data may return, but not parse as valid 1512 * Try again a few times, in case of e.g. analog cable noise */ 1513 while (tries--) { 1514 i = ufx_read_edid(dev, edid, EDID_LENGTH); 1515 1516 if (i >= EDID_LENGTH) 1517 fb_edid_to_monspecs(edid, &info->monspecs); 1518 1519 if (info->monspecs.modedb_len > 0) { 1520 dev->edid = edid; 1521 dev->edid_size = i; 1522 break; 1523 } 1524 } 1525 1526 /* If that fails, use a previously returned EDID if available */ 1527 if (info->monspecs.modedb_len == 0) { 1528 pr_err("Unable to get valid EDID from device/display\n"); 1529 1530 if (dev->edid) { 1531 fb_edid_to_monspecs(dev->edid, &info->monspecs); 1532 if (info->monspecs.modedb_len > 0) 1533 pr_err("Using previously queried EDID\n"); 1534 } 1535 } 1536 1537 /* If that fails, use the default EDID we were handed */ 1538 if (info->monspecs.modedb_len == 0) { 1539 if (default_edid_size >= EDID_LENGTH) { 1540 fb_edid_to_monspecs(default_edid, &info->monspecs); 1541 if (info->monspecs.modedb_len > 0) { 1542 memcpy(edid, default_edid, default_edid_size); 1543 dev->edid = edid; 1544 dev->edid_size = default_edid_size; 1545 pr_err("Using default/backup EDID\n"); 1546 } 1547 } 1548 } 1549 1550 /* If we've got modes, let's pick a best default mode */ 1551 if (info->monspecs.modedb_len > 0) { 1552 1553 for (i = 0; i < info->monspecs.modedb_len; i++) { 1554 if (ufx_is_valid_mode(&info->monspecs.modedb[i], info)) 1555 fb_add_videomode(&info->monspecs.modedb[i], 1556 &info->modelist); 1557 else /* if we've removed top/best mode */ 1558 info->monspecs.misc &= ~FB_MISC_1ST_DETAIL; 1559 } 1560 1561 default_vmode = fb_find_best_display(&info->monspecs, 1562 &info->modelist); 1563 } 1564 1565 /* If everything else has failed, fall back to safe default mode */ 1566 if (default_vmode == NULL) { 1567 1568 struct fb_videomode fb_vmode = {0}; 1569 1570 /* Add the standard VESA modes to our modelist 1571 * Since we don't have EDID, there may be modes that 1572 * overspec monitor and/or are incorrect aspect ratio, etc. 1573 * But at least the user has a chance to choose 1574 */ 1575 for (i = 0; i < VESA_MODEDB_SIZE; i++) { 1576 if (ufx_is_valid_mode((struct fb_videomode *) 1577 &vesa_modes[i], info)) 1578 fb_add_videomode(&vesa_modes[i], 1579 &info->modelist); 1580 } 1581 1582 /* default to resolution safe for projectors 1583 * (since they are most common case without EDID) 1584 */ 1585 fb_vmode.xres = 800; 1586 fb_vmode.yres = 600; 1587 fb_vmode.refresh = 60; 1588 default_vmode = fb_find_nearest_mode(&fb_vmode, 1589 &info->modelist); 1590 } 1591 1592 /* If we have good mode and no active clients */ 1593 if ((default_vmode != NULL) && (dev->fb_count == 0)) { 1594 1595 fb_videomode_to_var(&info->var, default_vmode); 1596 ufx_var_color_format(&info->var); 1597 1598 /* with mode size info, we can now alloc our framebuffer */ 1599 memcpy(&info->fix, &ufx_fix, sizeof(ufx_fix)); 1600 info->fix.line_length = info->var.xres * 1601 (info->var.bits_per_pixel / 8); 1602 1603 result = ufx_realloc_framebuffer(dev, info); 1604 1605 } else 1606 result = -EINVAL; 1607 1608 error: 1609 if (edid && (dev->edid != edid)) 1610 kfree(edid); 1611 1612 if (info->dev) 1613 mutex_unlock(&info->lock); 1614 1615 return result; 1616 } 1617 1618 static int ufx_usb_probe(struct usb_interface *interface, 1619 const struct usb_device_id *id) 1620 { 1621 struct usb_device *usbdev; 1622 struct ufx_data *dev; 1623 struct fb_info *info = NULL; 1624 int retval = -ENOMEM; 1625 u32 id_rev, fpga_rev; 1626 1627 /* usb initialization */ 1628 usbdev = interface_to_usbdev(interface); 1629 BUG_ON(!usbdev); 1630 1631 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1632 if (dev == NULL) { 1633 dev_err(&usbdev->dev, "ufx_usb_probe: failed alloc of dev struct\n"); 1634 goto error; 1635 } 1636 1637 /* we need to wait for both usb and fbdev to spin down on disconnect */ 1638 kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */ 1639 kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */ 1640 1641 dev->udev = usbdev; 1642 dev->gdev = &usbdev->dev; /* our generic struct device * */ 1643 usb_set_intfdata(interface, dev); 1644 1645 dev_dbg(dev->gdev, "%s %s - serial #%s\n", 1646 usbdev->manufacturer, usbdev->product, usbdev->serial); 1647 dev_dbg(dev->gdev, "vid_%04x&pid_%04x&rev_%04x driver's ufx_data struct at %p\n", 1648 le16_to_cpu(usbdev->descriptor.idVendor), 1649 le16_to_cpu(usbdev->descriptor.idProduct), 1650 le16_to_cpu(usbdev->descriptor.bcdDevice), dev); 1651 dev_dbg(dev->gdev, "console enable=%d\n", console); 1652 dev_dbg(dev->gdev, "fb_defio enable=%d\n", fb_defio); 1653 1654 if (!ufx_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { 1655 retval = -ENOMEM; 1656 dev_err(dev->gdev, "ufx_alloc_urb_list failed\n"); 1657 goto error; 1658 } 1659 1660 /* We don't register a new USB class. Our client interface is fbdev */ 1661 1662 /* allocates framebuffer driver structure, not framebuffer memory */ 1663 info = framebuffer_alloc(0, &usbdev->dev); 1664 if (!info) { 1665 retval = -ENOMEM; 1666 dev_err(dev->gdev, "framebuffer_alloc failed\n"); 1667 goto error; 1668 } 1669 1670 dev->info = info; 1671 info->par = dev; 1672 info->pseudo_palette = dev->pseudo_palette; 1673 info->fbops = &ufx_ops; 1674 1675 retval = fb_alloc_cmap(&info->cmap, 256, 0); 1676 if (retval < 0) { 1677 dev_err(dev->gdev, "fb_alloc_cmap failed %x\n", retval); 1678 goto error; 1679 } 1680 1681 INIT_DELAYED_WORK(&dev->free_framebuffer_work, 1682 ufx_free_framebuffer_work); 1683 1684 INIT_LIST_HEAD(&info->modelist); 1685 1686 retval = ufx_reg_read(dev, 0x3000, &id_rev); 1687 check_warn_goto_error(retval, "error %d reading 0x3000 register from device", retval); 1688 dev_dbg(dev->gdev, "ID_REV register value 0x%08x", id_rev); 1689 1690 retval = ufx_reg_read(dev, 0x3004, &fpga_rev); 1691 check_warn_goto_error(retval, "error %d reading 0x3004 register from device", retval); 1692 dev_dbg(dev->gdev, "FPGA_REV register value 0x%08x", fpga_rev); 1693 1694 dev_dbg(dev->gdev, "resetting device"); 1695 retval = ufx_lite_reset(dev); 1696 check_warn_goto_error(retval, "error %d resetting device", retval); 1697 1698 dev_dbg(dev->gdev, "configuring system clock"); 1699 retval = ufx_config_sys_clk(dev); 1700 check_warn_goto_error(retval, "error %d configuring system clock", retval); 1701 1702 dev_dbg(dev->gdev, "configuring DDR2 controller"); 1703 retval = ufx_config_ddr2(dev); 1704 check_warn_goto_error(retval, "error %d initialising DDR2 controller", retval); 1705 1706 dev_dbg(dev->gdev, "configuring I2C controller"); 1707 retval = ufx_i2c_init(dev); 1708 check_warn_goto_error(retval, "error %d initialising I2C controller", retval); 1709 1710 dev_dbg(dev->gdev, "selecting display mode"); 1711 retval = ufx_setup_modes(dev, info, NULL, 0); 1712 check_warn_goto_error(retval, "unable to find common mode for display and adapter"); 1713 1714 retval = ufx_reg_set_bits(dev, 0x4000, 0x00000001); 1715 check_warn_goto_error(retval, "error %d enabling graphics engine", retval); 1716 1717 /* ready to begin using device */ 1718 atomic_set(&dev->usb_active, 1); 1719 1720 dev_dbg(dev->gdev, "checking var"); 1721 retval = ufx_ops_check_var(&info->var, info); 1722 check_warn_goto_error(retval, "error %d ufx_ops_check_var", retval); 1723 1724 dev_dbg(dev->gdev, "setting par"); 1725 retval = ufx_ops_set_par(info); 1726 check_warn_goto_error(retval, "error %d ufx_ops_set_par", retval); 1727 1728 dev_dbg(dev->gdev, "registering framebuffer"); 1729 retval = register_framebuffer(info); 1730 check_warn_goto_error(retval, "error %d register_framebuffer", retval); 1731 1732 dev_info(dev->gdev, "SMSC UDX USB device /dev/fb%d attached. %dx%d resolution." 1733 " Using %dK framebuffer memory\n", info->node, 1734 info->var.xres, info->var.yres, info->fix.smem_len >> 10); 1735 1736 return 0; 1737 1738 error: 1739 if (dev) { 1740 if (info) { 1741 if (info->cmap.len != 0) 1742 fb_dealloc_cmap(&info->cmap); 1743 if (info->monspecs.modedb) 1744 fb_destroy_modedb(info->monspecs.modedb); 1745 vfree(info->screen_base); 1746 1747 fb_destroy_modelist(&info->modelist); 1748 1749 framebuffer_release(info); 1750 } 1751 1752 kref_put(&dev->kref, ufx_free); /* ref for framebuffer */ 1753 kref_put(&dev->kref, ufx_free); /* last ref from kref_init */ 1754 1755 /* dev has been deallocated. Do not dereference */ 1756 } 1757 1758 return retval; 1759 } 1760 1761 static void ufx_usb_disconnect(struct usb_interface *interface) 1762 { 1763 struct ufx_data *dev; 1764 1765 dev = usb_get_intfdata(interface); 1766 1767 pr_debug("USB disconnect starting\n"); 1768 1769 /* we virtualize until all fb clients release. Then we free */ 1770 dev->virtualized = true; 1771 1772 /* When non-active we'll update virtual framebuffer, but no new urbs */ 1773 atomic_set(&dev->usb_active, 0); 1774 1775 usb_set_intfdata(interface, NULL); 1776 1777 /* if clients still have us open, will be freed on last close */ 1778 if (dev->fb_count == 0) 1779 schedule_delayed_work(&dev->free_framebuffer_work, 0); 1780 1781 /* release reference taken by kref_init in probe() */ 1782 kref_put(&dev->kref, ufx_free); 1783 1784 /* consider ufx_data freed */ 1785 } 1786 1787 static struct usb_driver ufx_driver = { 1788 .name = "smscufx", 1789 .probe = ufx_usb_probe, 1790 .disconnect = ufx_usb_disconnect, 1791 .id_table = id_table, 1792 }; 1793 1794 module_usb_driver(ufx_driver); 1795 1796 static void ufx_urb_completion(struct urb *urb) 1797 { 1798 struct urb_node *unode = urb->context; 1799 struct ufx_data *dev = unode->dev; 1800 unsigned long flags; 1801 1802 /* sync/async unlink faults aren't errors */ 1803 if (urb->status) { 1804 if (!(urb->status == -ENOENT || 1805 urb->status == -ECONNRESET || 1806 urb->status == -ESHUTDOWN)) { 1807 pr_err("%s - nonzero write bulk status received: %d\n", 1808 __func__, urb->status); 1809 atomic_set(&dev->lost_pixels, 1); 1810 } 1811 } 1812 1813 urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */ 1814 1815 spin_lock_irqsave(&dev->urbs.lock, flags); 1816 list_add_tail(&unode->entry, &dev->urbs.list); 1817 dev->urbs.available++; 1818 spin_unlock_irqrestore(&dev->urbs.lock, flags); 1819 1820 /* When using fb_defio, we deadlock if up() is called 1821 * while another is waiting. So queue to another process */ 1822 if (fb_defio) 1823 schedule_delayed_work(&unode->release_urb_work, 0); 1824 else 1825 up(&dev->urbs.limit_sem); 1826 } 1827 1828 static void ufx_free_urb_list(struct ufx_data *dev) 1829 { 1830 int count = dev->urbs.count; 1831 struct list_head *node; 1832 struct urb_node *unode; 1833 struct urb *urb; 1834 int ret; 1835 unsigned long flags; 1836 1837 pr_debug("Waiting for completes and freeing all render urbs\n"); 1838 1839 /* keep waiting and freeing, until we've got 'em all */ 1840 while (count--) { 1841 /* Getting interrupted means a leak, but ok at shutdown*/ 1842 ret = down_interruptible(&dev->urbs.limit_sem); 1843 if (ret) 1844 break; 1845 1846 spin_lock_irqsave(&dev->urbs.lock, flags); 1847 1848 node = dev->urbs.list.next; /* have reserved one with sem */ 1849 list_del_init(node); 1850 1851 spin_unlock_irqrestore(&dev->urbs.lock, flags); 1852 1853 unode = list_entry(node, struct urb_node, entry); 1854 urb = unode->urb; 1855 1856 /* Free each separately allocated piece */ 1857 usb_free_coherent(urb->dev, dev->urbs.size, 1858 urb->transfer_buffer, urb->transfer_dma); 1859 usb_free_urb(urb); 1860 kfree(node); 1861 } 1862 } 1863 1864 static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size) 1865 { 1866 int i = 0; 1867 struct urb *urb; 1868 struct urb_node *unode; 1869 char *buf; 1870 1871 spin_lock_init(&dev->urbs.lock); 1872 1873 dev->urbs.size = size; 1874 INIT_LIST_HEAD(&dev->urbs.list); 1875 1876 while (i < count) { 1877 unode = kzalloc(sizeof(*unode), GFP_KERNEL); 1878 if (!unode) 1879 break; 1880 unode->dev = dev; 1881 1882 INIT_DELAYED_WORK(&unode->release_urb_work, 1883 ufx_release_urb_work); 1884 1885 urb = usb_alloc_urb(0, GFP_KERNEL); 1886 if (!urb) { 1887 kfree(unode); 1888 break; 1889 } 1890 unode->urb = urb; 1891 1892 buf = usb_alloc_coherent(dev->udev, size, GFP_KERNEL, 1893 &urb->transfer_dma); 1894 if (!buf) { 1895 kfree(unode); 1896 usb_free_urb(urb); 1897 break; 1898 } 1899 1900 /* urb->transfer_buffer_length set to actual before submit */ 1901 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1), 1902 buf, size, ufx_urb_completion, unode); 1903 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1904 1905 list_add_tail(&unode->entry, &dev->urbs.list); 1906 1907 i++; 1908 } 1909 1910 sema_init(&dev->urbs.limit_sem, i); 1911 dev->urbs.count = i; 1912 dev->urbs.available = i; 1913 1914 pr_debug("allocated %d %d byte urbs\n", i, (int) size); 1915 1916 return i; 1917 } 1918 1919 static struct urb *ufx_get_urb(struct ufx_data *dev) 1920 { 1921 int ret = 0; 1922 struct list_head *entry; 1923 struct urb_node *unode; 1924 struct urb *urb = NULL; 1925 unsigned long flags; 1926 1927 /* Wait for an in-flight buffer to complete and get re-queued */ 1928 ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT); 1929 if (ret) { 1930 atomic_set(&dev->lost_pixels, 1); 1931 pr_warn("wait for urb interrupted: %x available: %d\n", 1932 ret, dev->urbs.available); 1933 goto error; 1934 } 1935 1936 spin_lock_irqsave(&dev->urbs.lock, flags); 1937 1938 BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */ 1939 entry = dev->urbs.list.next; 1940 list_del_init(entry); 1941 dev->urbs.available--; 1942 1943 spin_unlock_irqrestore(&dev->urbs.lock, flags); 1944 1945 unode = list_entry(entry, struct urb_node, entry); 1946 urb = unode->urb; 1947 1948 error: 1949 return urb; 1950 } 1951 1952 static int ufx_submit_urb(struct ufx_data *dev, struct urb *urb, size_t len) 1953 { 1954 int ret; 1955 1956 BUG_ON(len > dev->urbs.size); 1957 1958 urb->transfer_buffer_length = len; /* set to actual payload len */ 1959 ret = usb_submit_urb(urb, GFP_KERNEL); 1960 if (ret) { 1961 ufx_urb_completion(urb); /* because no one else will */ 1962 atomic_set(&dev->lost_pixels, 1); 1963 pr_err("usb_submit_urb error %x\n", ret); 1964 } 1965 return ret; 1966 } 1967 1968 module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1969 MODULE_PARM_DESC(console, "Allow fbcon to be used on this display"); 1970 1971 module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1972 MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support"); 1973 1974 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>"); 1975 MODULE_DESCRIPTION("SMSC UFX kernel framebuffer driver"); 1976 MODULE_LICENSE("GPL"); 1977