linux/drivers/video/smscufx.c
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   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
  74struct dloarea {
  75        int x, y;
  76        int w, h;
  77};
  78
  79struct 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
  86struct 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
  95struct 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
 111static 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
 121static 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
 125static struct usb_device_id id_table[] = {
 126        {USB_DEVICE(0x0424, 0x9d00),},
 127        {USB_DEVICE(0x0424, 0x9d01),},
 128        {},
 129};
 130MODULE_DEVICE_TABLE(usb, id_table);
 131
 132/* module options */
 133static bool console;   /* Optionally allow fbcon to consume first framebuffer */
 134static bool fb_defio = true;  /* Optionally enable fb_defio mmap support */
 135
 136/* ufx keeps a list of urbs for efficient bulk transfers */
 137static void ufx_urb_completion(struct urb *urb);
 138static struct urb *ufx_get_urb(struct ufx_data *dev);
 139static int ufx_submit_urb(struct ufx_data *dev, struct urb * urb, size_t len);
 140static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size);
 141static void ufx_free_urb_list(struct ufx_data *dev);
 142
 143/* reads a control register */
 144static 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 */
 170static 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
 197static 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
 215static 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
 220static 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
 225static 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 */
 240static 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 */
 277static 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 */
 314static 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 */
 351static 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
 387static 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
 408static 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
 497struct 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
 508static 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 */
 532static 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 */
 616static 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
 661static 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
 778static 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
 813static 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
 852static 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. */
 900static 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
 920static 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
 932static 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
 943static 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. */
 958static 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
 988static 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 */
1037static int
1038ufx_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) */
1066static 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(struct fb_deferred_io), GFP_KERNEL);
1090
1091                if (fbdefio) {
1092                        fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1093                        fbdefio->deferred_io = ufx_dpy_deferred_io;
1094                }
1095
1096                info->fbdefio = fbdefio;
1097                fb_deferred_io_init(info);
1098        }
1099
1100        pr_debug("open /dev/fb%d user=%d fb_info=%p count=%d",
1101                info->node, user, info, dev->fb_count);
1102
1103        return 0;
1104}
1105
1106/*
1107 * Called when all client interfaces to start transactions have been disabled,
1108 * and all references to our device instance (ufx_data) are released.
1109 * Every transaction must have a reference, so we know are fully spun down
1110 */
1111static void ufx_free(struct kref *kref)
1112{
1113        struct ufx_data *dev = container_of(kref, struct ufx_data, kref);
1114
1115        /* this function will wait for all in-flight urbs to complete */
1116        if (dev->urbs.count > 0)
1117                ufx_free_urb_list(dev);
1118
1119        pr_debug("freeing ufx_data %p", dev);
1120
1121        kfree(dev);
1122}
1123
1124static void ufx_release_urb_work(struct work_struct *work)
1125{
1126        struct urb_node *unode = container_of(work, struct urb_node,
1127                                              release_urb_work.work);
1128
1129        up(&unode->dev->urbs.limit_sem);
1130}
1131
1132static void ufx_free_framebuffer_work(struct work_struct *work)
1133{
1134        struct ufx_data *dev = container_of(work, struct ufx_data,
1135                                            free_framebuffer_work.work);
1136        struct fb_info *info = dev->info;
1137        int node = info->node;
1138
1139        unregister_framebuffer(info);
1140
1141        if (info->cmap.len != 0)
1142                fb_dealloc_cmap(&info->cmap);
1143        if (info->monspecs.modedb)
1144                fb_destroy_modedb(info->monspecs.modedb);
1145        if (info->screen_base)
1146                vfree(info->screen_base);
1147
1148        fb_destroy_modelist(&info->modelist);
1149
1150        dev->info = 0;
1151
1152        /* Assume info structure is freed after this point */
1153        framebuffer_release(info);
1154
1155        pr_debug("fb_info for /dev/fb%d has been freed", node);
1156
1157        /* ref taken in probe() as part of registering framebfufer */
1158        kref_put(&dev->kref, ufx_free);
1159}
1160
1161/*
1162 * Assumes caller is holding info->lock mutex (for open and release at least)
1163 */
1164static int ufx_ops_release(struct fb_info *info, int user)
1165{
1166        struct ufx_data *dev = info->par;
1167
1168        dev->fb_count--;
1169
1170        /* We can't free fb_info here - fbmem will touch it when we return */
1171        if (dev->virtualized && (dev->fb_count == 0))
1172                schedule_delayed_work(&dev->free_framebuffer_work, HZ);
1173
1174        if ((dev->fb_count == 0) && (info->fbdefio)) {
1175                fb_deferred_io_cleanup(info);
1176                kfree(info->fbdefio);
1177                info->fbdefio = NULL;
1178                info->fbops->fb_mmap = ufx_ops_mmap;
1179        }
1180
1181        pr_debug("released /dev/fb%d user=%d count=%d",
1182                  info->node, user, dev->fb_count);
1183
1184        kref_put(&dev->kref, ufx_free);
1185
1186        return 0;
1187}
1188
1189/* Check whether a video mode is supported by the chip
1190 * We start from monitor's modes, so don't need to filter that here */
1191static int ufx_is_valid_mode(struct fb_videomode *mode,
1192                struct fb_info *info)
1193{
1194        if ((mode->xres * mode->yres) > (2048 * 1152)) {
1195                pr_debug("%dx%d too many pixels",
1196                       mode->xres, mode->yres);
1197                return 0;
1198        }
1199
1200        if (mode->pixclock < 5000) {
1201                pr_debug("%dx%d %dps pixel clock too fast",
1202                       mode->xres, mode->yres, mode->pixclock);
1203                return 0;
1204        }
1205
1206        pr_debug("%dx%d (pixclk %dps %dMHz) valid mode", mode->xres, mode->yres,
1207                mode->pixclock, (1000000 / mode->pixclock));
1208        return 1;
1209}
1210
1211static void ufx_var_color_format(struct fb_var_screeninfo *var)
1212{
1213        const struct fb_bitfield red = { 11, 5, 0 };
1214        const struct fb_bitfield green = { 5, 6, 0 };
1215        const struct fb_bitfield blue = { 0, 5, 0 };
1216
1217        var->bits_per_pixel = 16;
1218        var->red = red;
1219        var->green = green;
1220        var->blue = blue;
1221}
1222
1223static int ufx_ops_check_var(struct fb_var_screeninfo *var,
1224                                struct fb_info *info)
1225{
1226        struct fb_videomode mode;
1227
1228        /* TODO: support dynamically changing framebuffer size */
1229        if ((var->xres * var->yres * 2) > info->fix.smem_len)
1230                return -EINVAL;
1231
1232        /* set device-specific elements of var unrelated to mode */
1233        ufx_var_color_format(var);
1234
1235        fb_var_to_videomode(&mode, var);
1236
1237        if (!ufx_is_valid_mode(&mode, info))
1238                return -EINVAL;
1239
1240        return 0;
1241}
1242
1243static int ufx_ops_set_par(struct fb_info *info)
1244{
1245        struct ufx_data *dev = info->par;
1246        int result;
1247        u16 *pix_framebuffer;
1248        int i;
1249
1250        pr_debug("set_par mode %dx%d", info->var.xres, info->var.yres);
1251        result = ufx_set_vid_mode(dev, &info->var);
1252
1253        if ((result == 0) && (dev->fb_count == 0)) {
1254                /* paint greenscreen */
1255                pix_framebuffer = (u16 *) info->screen_base;
1256                for (i = 0; i < info->fix.smem_len / 2; i++)
1257                        pix_framebuffer[i] = 0x37e6;
1258
1259                ufx_handle_damage(dev, 0, 0, info->var.xres, info->var.yres);
1260        }
1261
1262        /* re-enable defio if previously disabled by damage tracking */
1263        if (info->fbdefio)
1264                info->fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1265
1266        return result;
1267}
1268
1269/* In order to come back from full DPMS off, we need to set the mode again */
1270static int ufx_ops_blank(int blank_mode, struct fb_info *info)
1271{
1272        struct ufx_data *dev = info->par;
1273        ufx_set_vid_mode(dev, &info->var);
1274        return 0;
1275}
1276
1277static struct fb_ops ufx_ops = {
1278        .owner = THIS_MODULE,
1279        .fb_read = fb_sys_read,
1280        .fb_write = ufx_ops_write,
1281        .fb_setcolreg = ufx_ops_setcolreg,
1282        .fb_fillrect = ufx_ops_fillrect,
1283        .fb_copyarea = ufx_ops_copyarea,
1284        .fb_imageblit = ufx_ops_imageblit,
1285        .fb_mmap = ufx_ops_mmap,
1286        .fb_ioctl = ufx_ops_ioctl,
1287        .fb_open = ufx_ops_open,
1288        .fb_release = ufx_ops_release,
1289        .fb_blank = ufx_ops_blank,
1290        .fb_check_var = ufx_ops_check_var,
1291        .fb_set_par = ufx_ops_set_par,
1292};
1293
1294/* Assumes &info->lock held by caller
1295 * Assumes no active clients have framebuffer open */
1296static int ufx_realloc_framebuffer(struct ufx_data *dev, struct fb_info *info)
1297{
1298        int retval = -ENOMEM;
1299        int old_len = info->fix.smem_len;
1300        int new_len;
1301        unsigned char *old_fb = info->screen_base;
1302        unsigned char *new_fb;
1303
1304        pr_debug("Reallocating framebuffer. Addresses will change!");
1305
1306        new_len = info->fix.line_length * info->var.yres;
1307
1308        if (PAGE_ALIGN(new_len) > old_len) {
1309                /*
1310                 * Alloc system memory for virtual framebuffer
1311                 */
1312                new_fb = vmalloc(new_len);
1313                if (!new_fb) {
1314                        pr_err("Virtual framebuffer alloc failed");
1315                        goto error;
1316                }
1317
1318                if (info->screen_base) {
1319                        memcpy(new_fb, old_fb, old_len);
1320                        vfree(info->screen_base);
1321                }
1322
1323                info->screen_base = new_fb;
1324                info->fix.smem_len = PAGE_ALIGN(new_len);
1325                info->fix.smem_start = (unsigned long) new_fb;
1326                info->flags = smscufx_info_flags;
1327        }
1328
1329        retval = 0;
1330
1331error:
1332        return retval;
1333}
1334
1335/* sets up I2C Controller for 100 Kbps, std. speed, 7-bit addr, master,
1336 * restart enabled, but no start byte, enable controller */
1337static int ufx_i2c_init(struct ufx_data *dev)
1338{
1339        u32 tmp;
1340
1341        /* disable the controller before it can be reprogrammed */
1342        int status = ufx_reg_write(dev, 0x106C, 0x00);
1343        check_warn_return(status, "failed to disable I2C");
1344
1345        /* Setup the clock count registers
1346         * (12+1) = 13 clks @ 2.5 MHz = 5.2 uS */
1347        status = ufx_reg_write(dev, 0x1018, 12);
1348        check_warn_return(status, "error writing 0x1018");
1349
1350        /* (6+8) = 14 clks @ 2.5 MHz = 5.6 uS */
1351        status = ufx_reg_write(dev, 0x1014, 6);
1352        check_warn_return(status, "error writing 0x1014");
1353
1354        status = ufx_reg_read(dev, 0x1000, &tmp);
1355        check_warn_return(status, "error reading 0x1000");
1356
1357        /* set speed to std mode */
1358        tmp &= ~(0x06);
1359        tmp |= 0x02;
1360
1361        /* 7-bit (not 10-bit) addressing */
1362        tmp &= ~(0x10);
1363
1364        /* enable restart conditions and master mode */
1365        tmp |= 0x21;
1366
1367        status = ufx_reg_write(dev, 0x1000, tmp);
1368        check_warn_return(status, "error writing 0x1000");
1369
1370        /* Set normal tx using target address 0 */
1371        status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0xC00, 0x000);
1372        check_warn_return(status, "error setting TX mode bits in 0x1004");
1373
1374        /* Enable the controller */
1375        status = ufx_reg_write(dev, 0x106C, 0x01);
1376        check_warn_return(status, "failed to enable I2C");
1377
1378        return 0;
1379}
1380
1381/* sets the I2C port mux and target address */
1382static int ufx_i2c_configure(struct ufx_data *dev)
1383{
1384        int status = ufx_reg_write(dev, 0x106C, 0x00);
1385        check_warn_return(status, "failed to disable I2C");
1386
1387        status = ufx_reg_write(dev, 0x3010, 0x00000000);
1388        check_warn_return(status, "failed to write 0x3010");
1389
1390        /* A0h is std for any EDID, right shifted by one */
1391        status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0x3FF, (0xA0 >> 1));
1392        check_warn_return(status, "failed to set TAR bits in 0x1004");
1393
1394        status = ufx_reg_write(dev, 0x106C, 0x01);
1395        check_warn_return(status, "failed to enable I2C");
1396
1397        return 0;
1398}
1399
1400/* wait for BUSY to clear, with a timeout of 50ms with 10ms sleeps. if no
1401 * monitor is connected, there is no error except for timeout */
1402static int ufx_i2c_wait_busy(struct ufx_data *dev)
1403{
1404        u32 tmp;
1405        int i, status;
1406
1407        for (i = 0; i < 15; i++) {
1408                status = ufx_reg_read(dev, 0x1100, &tmp);
1409                check_warn_return(status, "0x1100 read failed");
1410
1411                /* if BUSY is clear, check for error */
1412                if ((tmp & 0x80000000) == 0) {
1413                        if (tmp & 0x20000000) {
1414                                pr_warn("I2C read failed, 0x1100=0x%08x", tmp);
1415                                return -EIO;
1416                        }
1417
1418                        return 0;
1419                }
1420
1421                /* perform the first 10 retries without delay */
1422                if (i >= 10)
1423                        msleep(10);
1424        }
1425
1426        pr_warn("I2C access timed out, resetting I2C hardware");
1427        status =  ufx_reg_write(dev, 0x1100, 0x40000000);
1428        check_warn_return(status, "0x1100 write failed");
1429
1430        return -ETIMEDOUT;
1431}
1432
1433/* reads a 128-byte EDID block from the currently selected port and TAR */
1434static int ufx_read_edid(struct ufx_data *dev, u8 *edid, int edid_len)
1435{
1436        int i, j, status;
1437        u32 *edid_u32 = (u32 *)edid;
1438
1439        BUG_ON(edid_len != EDID_LENGTH);
1440
1441        status = ufx_i2c_configure(dev);
1442        if (status < 0) {
1443                pr_err("ufx_i2c_configure failed");
1444                return status;
1445        }
1446
1447        memset(edid, 0xff, EDID_LENGTH);
1448
1449        /* Read the 128-byte EDID as 2 bursts of 64 bytes */
1450        for (i = 0; i < 2; i++) {
1451                u32 temp = 0x28070000 | (63 << 20) | (((u32)(i * 64)) << 8);
1452                status = ufx_reg_write(dev, 0x1100, temp);
1453                check_warn_return(status, "Failed to write 0x1100");
1454
1455                temp |= 0x80000000;
1456                status = ufx_reg_write(dev, 0x1100, temp);
1457                check_warn_return(status, "Failed to write 0x1100");
1458
1459                status = ufx_i2c_wait_busy(dev);
1460                check_warn_return(status, "Timeout waiting for I2C BUSY to clear");
1461
1462                for (j = 0; j < 16; j++) {
1463                        u32 data_reg_addr = 0x1110 + (j * 4);
1464                        status = ufx_reg_read(dev, data_reg_addr, edid_u32++);
1465                        check_warn_return(status, "Error reading i2c data");
1466                }
1467        }
1468
1469        /* all FF's in the first 16 bytes indicates nothing is connected */
1470        for (i = 0; i < 16; i++) {
1471                if (edid[i] != 0xFF) {
1472                        pr_debug("edid data read successfully");
1473                        return EDID_LENGTH;
1474                }
1475        }
1476
1477        pr_warn("edid data contains all 0xff");
1478        return -ETIMEDOUT;
1479}
1480
1481/* 1) use sw default
1482 * 2) Parse into various fb_info structs
1483 * 3) Allocate virtual framebuffer memory to back highest res mode
1484 *
1485 * Parses EDID into three places used by various parts of fbdev:
1486 * fb_var_screeninfo contains the timing of the monitor's preferred mode
1487 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb
1488 * fb_info.modelist is a linked list of all monitor & VESA modes which work
1489 *
1490 * If EDID is not readable/valid, then modelist is all VESA modes,
1491 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
1492 * Returns 0 if successful */
1493static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info,
1494        char *default_edid, size_t default_edid_size)
1495{
1496        const struct fb_videomode *default_vmode = NULL;
1497        u8 *edid;
1498        int i, result = 0, tries = 3;
1499
1500        if (info->dev) /* only use mutex if info has been registered */
1501                mutex_lock(&info->lock);
1502
1503        edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
1504        if (!edid) {
1505                result = -ENOMEM;
1506                goto error;
1507        }
1508
1509        fb_destroy_modelist(&info->modelist);
1510        memset(&info->monspecs, 0, sizeof(info->monspecs));
1511
1512        /* Try to (re)read EDID from hardware first
1513         * EDID data may return, but not parse as valid
1514         * Try again a few times, in case of e.g. analog cable noise */
1515        while (tries--) {
1516                i = ufx_read_edid(dev, edid, EDID_LENGTH);
1517
1518                if (i >= EDID_LENGTH)
1519                        fb_edid_to_monspecs(edid, &info->monspecs);
1520
1521                if (info->monspecs.modedb_len > 0) {
1522                        dev->edid = edid;
1523                        dev->edid_size = i;
1524                        break;
1525                }
1526        }
1527
1528        /* If that fails, use a previously returned EDID if available */
1529        if (info->monspecs.modedb_len == 0) {
1530                pr_err("Unable to get valid EDID from device/display\n");
1531
1532                if (dev->edid) {
1533                        fb_edid_to_monspecs(dev->edid, &info->monspecs);
1534                        if (info->monspecs.modedb_len > 0)
1535                                pr_err("Using previously queried EDID\n");
1536                }
1537        }
1538
1539        /* If that fails, use the default EDID we were handed */
1540        if (info->monspecs.modedb_len == 0) {
1541                if (default_edid_size >= EDID_LENGTH) {
1542                        fb_edid_to_monspecs(default_edid, &info->monspecs);
1543                        if (info->monspecs.modedb_len > 0) {
1544                                memcpy(edid, default_edid, default_edid_size);
1545                                dev->edid = edid;
1546                                dev->edid_size = default_edid_size;
1547                                pr_err("Using default/backup EDID\n");
1548                        }
1549                }
1550        }
1551
1552        /* If we've got modes, let's pick a best default mode */
1553        if (info->monspecs.modedb_len > 0) {
1554
1555                for (i = 0; i < info->monspecs.modedb_len; i++) {
1556                        if (ufx_is_valid_mode(&info->monspecs.modedb[i], info))
1557                                fb_add_videomode(&info->monspecs.modedb[i],
1558                                        &info->modelist);
1559                        else /* if we've removed top/best mode */
1560                                info->monspecs.misc &= ~FB_MISC_1ST_DETAIL;
1561                }
1562
1563                default_vmode = fb_find_best_display(&info->monspecs,
1564                                                     &info->modelist);
1565        }
1566
1567        /* If everything else has failed, fall back to safe default mode */
1568        if (default_vmode == NULL) {
1569
1570                struct fb_videomode fb_vmode = {0};
1571
1572                /* Add the standard VESA modes to our modelist
1573                 * Since we don't have EDID, there may be modes that
1574                 * overspec monitor and/or are incorrect aspect ratio, etc.
1575                 * But at least the user has a chance to choose
1576                 */
1577                for (i = 0; i < VESA_MODEDB_SIZE; i++) {
1578                        if (ufx_is_valid_mode((struct fb_videomode *)
1579                                                &vesa_modes[i], info))
1580                                fb_add_videomode(&vesa_modes[i],
1581                                                 &info->modelist);
1582                }
1583
1584                /* default to resolution safe for projectors
1585                 * (since they are most common case without EDID)
1586                 */
1587                fb_vmode.xres = 800;
1588                fb_vmode.yres = 600;
1589                fb_vmode.refresh = 60;
1590                default_vmode = fb_find_nearest_mode(&fb_vmode,
1591                                                     &info->modelist);
1592        }
1593
1594        /* If we have good mode and no active clients */
1595        if ((default_vmode != NULL) && (dev->fb_count == 0)) {
1596
1597                fb_videomode_to_var(&info->var, default_vmode);
1598                ufx_var_color_format(&info->var);
1599
1600                /* with mode size info, we can now alloc our framebuffer */
1601                memcpy(&info->fix, &ufx_fix, sizeof(ufx_fix));
1602                info->fix.line_length = info->var.xres *
1603                        (info->var.bits_per_pixel / 8);
1604
1605                result = ufx_realloc_framebuffer(dev, info);
1606
1607        } else
1608                result = -EINVAL;
1609
1610error:
1611        if (edid && (dev->edid != edid))
1612                kfree(edid);
1613
1614        if (info->dev)
1615                mutex_unlock(&info->lock);
1616
1617        return result;
1618}
1619
1620static int ufx_usb_probe(struct usb_interface *interface,
1621                        const struct usb_device_id *id)
1622{
1623        struct usb_device *usbdev;
1624        struct ufx_data *dev;
1625        struct fb_info *info = 0;
1626        int retval = -ENOMEM;
1627        u32 id_rev, fpga_rev;
1628
1629        /* usb initialization */
1630        usbdev = interface_to_usbdev(interface);
1631        BUG_ON(!usbdev);
1632
1633        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1634        if (dev == NULL) {
1635                dev_err(&usbdev->dev, "ufx_usb_probe: failed alloc of dev struct\n");
1636                goto error;
1637        }
1638
1639        /* we need to wait for both usb and fbdev to spin down on disconnect */
1640        kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */
1641        kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */
1642
1643        dev->udev = usbdev;
1644        dev->gdev = &usbdev->dev; /* our generic struct device * */
1645        usb_set_intfdata(interface, dev);
1646
1647        dev_dbg(dev->gdev, "%s %s - serial #%s\n",
1648                usbdev->manufacturer, usbdev->product, usbdev->serial);
1649        dev_dbg(dev->gdev, "vid_%04x&pid_%04x&rev_%04x driver's ufx_data struct at %p\n",
1650                usbdev->descriptor.idVendor, usbdev->descriptor.idProduct,
1651                usbdev->descriptor.bcdDevice, dev);
1652        dev_dbg(dev->gdev, "console enable=%d\n", console);
1653        dev_dbg(dev->gdev, "fb_defio enable=%d\n", fb_defio);
1654
1655        if (!ufx_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
1656                retval = -ENOMEM;
1657                dev_err(dev->gdev, "ufx_alloc_urb_list failed\n");
1658                goto error;
1659        }
1660
1661        /* We don't register a new USB class. Our client interface is fbdev */
1662
1663        /* allocates framebuffer driver structure, not framebuffer memory */
1664        info = framebuffer_alloc(0, &usbdev->dev);
1665        if (!info) {
1666                retval = -ENOMEM;
1667                dev_err(dev->gdev, "framebuffer_alloc failed\n");
1668                goto error;
1669        }
1670
1671        dev->info = info;
1672        info->par = dev;
1673        info->pseudo_palette = dev->pseudo_palette;
1674        info->fbops = &ufx_ops;
1675
1676        retval = fb_alloc_cmap(&info->cmap, 256, 0);
1677        if (retval < 0) {
1678                dev_err(dev->gdev, "fb_alloc_cmap failed %x\n", retval);
1679                goto error;
1680        }
1681
1682        INIT_DELAYED_WORK(&dev->free_framebuffer_work,
1683                          ufx_free_framebuffer_work);
1684
1685        INIT_LIST_HEAD(&info->modelist);
1686
1687        retval = ufx_reg_read(dev, 0x3000, &id_rev);
1688        check_warn_goto_error(retval, "error %d reading 0x3000 register from device", retval);
1689        dev_dbg(dev->gdev, "ID_REV register value 0x%08x", id_rev);
1690
1691        retval = ufx_reg_read(dev, 0x3004, &fpga_rev);
1692        check_warn_goto_error(retval, "error %d reading 0x3004 register from device", retval);
1693        dev_dbg(dev->gdev, "FPGA_REV register value 0x%08x", fpga_rev);
1694
1695        dev_dbg(dev->gdev, "resetting device");
1696        retval = ufx_lite_reset(dev);
1697        check_warn_goto_error(retval, "error %d resetting device", retval);
1698
1699        dev_dbg(dev->gdev, "configuring system clock");
1700        retval = ufx_config_sys_clk(dev);
1701        check_warn_goto_error(retval, "error %d configuring system clock", retval);
1702
1703        dev_dbg(dev->gdev, "configuring DDR2 controller");
1704        retval = ufx_config_ddr2(dev);
1705        check_warn_goto_error(retval, "error %d initialising DDR2 controller", retval);
1706
1707        dev_dbg(dev->gdev, "configuring I2C controller");
1708        retval = ufx_i2c_init(dev);
1709        check_warn_goto_error(retval, "error %d initialising I2C controller", retval);
1710
1711        dev_dbg(dev->gdev, "selecting display mode");
1712        retval = ufx_setup_modes(dev, info, NULL, 0);
1713        check_warn_goto_error(retval, "unable to find common mode for display and adapter");
1714
1715        retval = ufx_reg_set_bits(dev, 0x4000, 0x00000001);
1716        check_warn_goto_error(retval, "error %d enabling graphics engine", retval);
1717
1718        /* ready to begin using device */
1719        atomic_set(&dev->usb_active, 1);
1720
1721        dev_dbg(dev->gdev, "checking var");
1722        retval = ufx_ops_check_var(&info->var, info);
1723        check_warn_goto_error(retval, "error %d ufx_ops_check_var", retval);
1724
1725        dev_dbg(dev->gdev, "setting par");
1726        retval = ufx_ops_set_par(info);
1727        check_warn_goto_error(retval, "error %d ufx_ops_set_par", retval);
1728
1729        dev_dbg(dev->gdev, "registering framebuffer");
1730        retval = register_framebuffer(info);
1731        check_warn_goto_error(retval, "error %d register_framebuffer", retval);
1732
1733        dev_info(dev->gdev, "SMSC UDX USB device /dev/fb%d attached. %dx%d resolution."
1734                " Using %dK framebuffer memory\n", info->node,
1735                info->var.xres, info->var.yres, info->fix.smem_len >> 10);
1736
1737        return 0;
1738
1739error:
1740        if (dev) {
1741                if (info) {
1742                        if (info->cmap.len != 0)
1743                                fb_dealloc_cmap(&info->cmap);
1744                        if (info->monspecs.modedb)
1745                                fb_destroy_modedb(info->monspecs.modedb);
1746                        if (info->screen_base)
1747                                vfree(info->screen_base);
1748
1749                        fb_destroy_modelist(&info->modelist);
1750
1751                        framebuffer_release(info);
1752                }
1753
1754                kref_put(&dev->kref, ufx_free); /* ref for framebuffer */
1755                kref_put(&dev->kref, ufx_free); /* last ref from kref_init */
1756
1757                /* dev has been deallocated. Do not dereference */
1758        }
1759
1760        return retval;
1761}
1762
1763static void ufx_usb_disconnect(struct usb_interface *interface)
1764{
1765        struct ufx_data *dev;
1766        struct fb_info *info;
1767
1768        dev = usb_get_intfdata(interface);
1769        info = dev->info;
1770
1771        pr_debug("USB disconnect starting\n");
1772
1773        /* we virtualize until all fb clients release. Then we free */
1774        dev->virtualized = true;
1775
1776        /* When non-active we'll update virtual framebuffer, but no new urbs */
1777        atomic_set(&dev->usb_active, 0);
1778
1779        usb_set_intfdata(interface, NULL);
1780
1781        /* if clients still have us open, will be freed on last close */
1782        if (dev->fb_count == 0)
1783                schedule_delayed_work(&dev->free_framebuffer_work, 0);
1784
1785        /* release reference taken by kref_init in probe() */
1786        kref_put(&dev->kref, ufx_free);
1787
1788        /* consider ufx_data freed */
1789}
1790
1791static struct usb_driver ufx_driver = {
1792        .name = "smscufx",
1793        .probe = ufx_usb_probe,
1794        .disconnect = ufx_usb_disconnect,
1795        .id_table = id_table,
1796};
1797
1798module_usb_driver(ufx_driver);
1799
1800static void ufx_urb_completion(struct urb *urb)
1801{
1802        struct urb_node *unode = urb->context;
1803        struct ufx_data *dev = unode->dev;
1804        unsigned long flags;
1805
1806        /* sync/async unlink faults aren't errors */
1807        if (urb->status) {
1808                if (!(urb->status == -ENOENT ||
1809                    urb->status == -ECONNRESET ||
1810                    urb->status == -ESHUTDOWN)) {
1811                        pr_err("%s - nonzero write bulk status received: %d\n",
1812                                __func__, urb->status);
1813                        atomic_set(&dev->lost_pixels, 1);
1814                }
1815        }
1816
1817        urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */
1818
1819        spin_lock_irqsave(&dev->urbs.lock, flags);
1820        list_add_tail(&unode->entry, &dev->urbs.list);
1821        dev->urbs.available++;
1822        spin_unlock_irqrestore(&dev->urbs.lock, flags);
1823
1824        /* When using fb_defio, we deadlock if up() is called
1825         * while another is waiting. So queue to another process */
1826        if (fb_defio)
1827                schedule_delayed_work(&unode->release_urb_work, 0);
1828        else
1829                up(&dev->urbs.limit_sem);
1830}
1831
1832static void ufx_free_urb_list(struct ufx_data *dev)
1833{
1834        int count = dev->urbs.count;
1835        struct list_head *node;
1836        struct urb_node *unode;
1837        struct urb *urb;
1838        int ret;
1839        unsigned long flags;
1840
1841        pr_debug("Waiting for completes and freeing all render urbs\n");
1842
1843        /* keep waiting and freeing, until we've got 'em all */
1844        while (count--) {
1845                /* Getting interrupted means a leak, but ok at shutdown*/
1846                ret = down_interruptible(&dev->urbs.limit_sem);
1847                if (ret)
1848                        break;
1849
1850                spin_lock_irqsave(&dev->urbs.lock, flags);
1851
1852                node = dev->urbs.list.next; /* have reserved one with sem */
1853                list_del_init(node);
1854
1855                spin_unlock_irqrestore(&dev->urbs.lock, flags);
1856
1857                unode = list_entry(node, struct urb_node, entry);
1858                urb = unode->urb;
1859
1860                /* Free each separately allocated piece */
1861                usb_free_coherent(urb->dev, dev->urbs.size,
1862                                  urb->transfer_buffer, urb->transfer_dma);
1863                usb_free_urb(urb);
1864                kfree(node);
1865        }
1866}
1867
1868static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size)
1869{
1870        int i = 0;
1871        struct urb *urb;
1872        struct urb_node *unode;
1873        char *buf;
1874
1875        spin_lock_init(&dev->urbs.lock);
1876
1877        dev->urbs.size = size;
1878        INIT_LIST_HEAD(&dev->urbs.list);
1879
1880        while (i < count) {
1881                unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
1882                if (!unode)
1883                        break;
1884                unode->dev = dev;
1885
1886                INIT_DELAYED_WORK(&unode->release_urb_work,
1887                          ufx_release_urb_work);
1888
1889                urb = usb_alloc_urb(0, GFP_KERNEL);
1890                if (!urb) {
1891                        kfree(unode);
1892                        break;
1893                }
1894                unode->urb = urb;
1895
1896                buf = usb_alloc_coherent(dev->udev, size, GFP_KERNEL,
1897                                         &urb->transfer_dma);
1898                if (!buf) {
1899                        kfree(unode);
1900                        usb_free_urb(urb);
1901                        break;
1902                }
1903
1904                /* urb->transfer_buffer_length set to actual before submit */
1905                usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1),
1906                        buf, size, ufx_urb_completion, unode);
1907                urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1908
1909                list_add_tail(&unode->entry, &dev->urbs.list);
1910
1911                i++;
1912        }
1913
1914        sema_init(&dev->urbs.limit_sem, i);
1915        dev->urbs.count = i;
1916        dev->urbs.available = i;
1917
1918        pr_debug("allocated %d %d byte urbs\n", i, (int) size);
1919
1920        return i;
1921}
1922
1923static struct urb *ufx_get_urb(struct ufx_data *dev)
1924{
1925        int ret = 0;
1926        struct list_head *entry;
1927        struct urb_node *unode;
1928        struct urb *urb = NULL;
1929        unsigned long flags;
1930
1931        /* Wait for an in-flight buffer to complete and get re-queued */
1932        ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT);
1933        if (ret) {
1934                atomic_set(&dev->lost_pixels, 1);
1935                pr_warn("wait for urb interrupted: %x available: %d\n",
1936                       ret, dev->urbs.available);
1937                goto error;
1938        }
1939
1940        spin_lock_irqsave(&dev->urbs.lock, flags);
1941
1942        BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */
1943        entry = dev->urbs.list.next;
1944        list_del_init(entry);
1945        dev->urbs.available--;
1946
1947        spin_unlock_irqrestore(&dev->urbs.lock, flags);
1948
1949        unode = list_entry(entry, struct urb_node, entry);
1950        urb = unode->urb;
1951
1952error:
1953        return urb;
1954}
1955
1956static int ufx_submit_urb(struct ufx_data *dev, struct urb *urb, size_t len)
1957{
1958        int ret;
1959
1960        BUG_ON(len > dev->urbs.size);
1961
1962        urb->transfer_buffer_length = len; /* set to actual payload len */
1963        ret = usb_submit_urb(urb, GFP_KERNEL);
1964        if (ret) {
1965                ufx_urb_completion(urb); /* because no one else will */
1966                atomic_set(&dev->lost_pixels, 1);
1967                pr_err("usb_submit_urb error %x\n", ret);
1968        }
1969        return ret;
1970}
1971
1972module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1973MODULE_PARM_DESC(console, "Allow fbcon to be used on this display");
1974
1975module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1976MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support");
1977
1978MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
1979MODULE_DESCRIPTION("SMSC UFX kernel framebuffer driver");
1980MODULE_LICENSE("GPL");
1981
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