target/linux/brcm2708/patches-4.4/0037-vc_mem-Add-vc_mem-driver.patch

   1 From 1dc99a2709085bc7bda11bd457280e9f00fd173b Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Wed, 17 Jun 2015 16:07:06 +0100
   4 Subject: [PATCH 037/423] vc_mem: Add vc_mem driver
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Signed-off-by: popcornmix <popcornmix@gmail.com>
  10
  11 BCM270x: Move vc_mem
  12
  13 Make the vc_mem module available for ARCH_BCM2835 by moving it.
  14
  15 Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
  16 ---
  17  arch/arm/mach-bcm2709/include/mach/vc_mem.h |  35 ---
  18  arch/arm/mach-bcm2709/vc_mem.c              | 431 ----------------------------
  19  drivers/char/broadcom/Kconfig               |  12 +-
  20  drivers/char/broadcom/Makefile              |   1 +
  21  drivers/char/broadcom/vc_mem.c              | 422 +++++++++++++++++++++++++++
  22  include/linux/broadcom/vc_mem.h             |  35 +++
  23  6 files changed, 469 insertions(+), 467 deletions(-)
  24  delete mode 100644 arch/arm/mach-bcm2709/include/mach/vc_mem.h
  25  delete mode 100644 arch/arm/mach-bcm2709/vc_mem.c
  26  create mode 100644 drivers/char/broadcom/vc_mem.c
  27  create mode 100644 include/linux/broadcom/vc_mem.h
  28
  29 --- a/arch/arm/mach-bcm2709/include/mach/vc_mem.h
  30 +++ /dev/null
  31 @@ -1,35 +0,0 @@
  32 -/*****************************************************************************
  33 -* Copyright 2010 - 2011 Broadcom Corporation.  All rights reserved.
  34 -*
  35 -* Unless you and Broadcom execute a separate written software license
  36 -* agreement governing use of this software, this software is licensed to you
  37 -* under the terms of the GNU General Public License version 2, available at
  38 -* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
  39 -*
  40 -* Notwithstanding the above, under no circumstances may you combine this
  41 -* software in any way with any other Broadcom software provided under a
  42 -* license other than the GPL, without Broadcom's express prior written
  43 -* consent.
  44 -*****************************************************************************/
  45 -
  46 -#if !defined( VC_MEM_H )
  47 -#define VC_MEM_H
  48 -
  49 -#include <linux/ioctl.h>
  50 -
  51 -#define VC_MEM_IOC_MAGIC  'v'
  52 -
  53 -#define VC_MEM_IOC_MEM_PHYS_ADDR    _IOR( VC_MEM_IOC_MAGIC, 0, unsigned long )
  54 -#define VC_MEM_IOC_MEM_SIZE         _IOR( VC_MEM_IOC_MAGIC, 1, unsigned int )
  55 -#define VC_MEM_IOC_MEM_BASE         _IOR( VC_MEM_IOC_MAGIC, 2, unsigned int )
  56 -#define VC_MEM_IOC_MEM_LOAD         _IOR( VC_MEM_IOC_MAGIC, 3, unsigned int )
  57 -
  58 -#if defined( __KERNEL__ )
  59 -#define VC_MEM_TO_ARM_ADDR_MASK 0x3FFFFFFF
  60 -
  61 -extern unsigned long mm_vc_mem_phys_addr;
  62 -extern unsigned int  mm_vc_mem_size;
  63 -extern int vc_mem_get_current_size( void );
  64 -#endif
  65 -
  66 -#endif  /* VC_MEM_H */
  67 --- a/arch/arm/mach-bcm2709/vc_mem.c
  68 +++ /dev/null
  69 @@ -1,431 +0,0 @@
  70 -/*****************************************************************************
  71 -* Copyright 2010 - 2011 Broadcom Corporation.  All rights reserved.
  72 -*
  73 -* Unless you and Broadcom execute a separate written software license
  74 -* agreement governing use of this software, this software is licensed to you
  75 -* under the terms of the GNU General Public License version 2, available at
  76 -* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
  77 -*
  78 -* Notwithstanding the above, under no circumstances may you combine this
  79 -* software in any way with any other Broadcom software provided under a
  80 -* license other than the GPL, without Broadcom's express prior written
  81 -* consent.
  82 -*****************************************************************************/
  83 -
  84 -#include <linux/kernel.h>
  85 -#include <linux/module.h>
  86 -#include <linux/fs.h>
  87 -#include <linux/device.h>
  88 -#include <linux/cdev.h>
  89 -#include <linux/mm.h>
  90 -#include <linux/slab.h>
  91 -#include <linux/debugfs.h>
  92 -#include <asm/uaccess.h>
  93 -#include <linux/dma-mapping.h>
  94 -#include <linux/platform_data/mailbox-bcm2708.h>
  95 -
  96 -#ifdef CONFIG_ARCH_KONA
  97 -#include <chal/chal_ipc.h>
  98 -#elif defined(CONFIG_ARCH_BCM2708) || defined(CONFIG_ARCH_BCM2709)
  99 -#else
 100 -#include <csp/chal_ipc.h>
 101 -#endif
 102 -
 103 -#include "mach/vc_mem.h"
 104 -
 105 -#define DRIVER_NAME  "vc-mem"
 106 -
 107 -// Device (/dev) related variables
 108 -static dev_t vc_mem_devnum = 0;
 109 -static struct class *vc_mem_class = NULL;
 110 -static struct cdev vc_mem_cdev;
 111 -static int vc_mem_inited = 0;
 112 -
 113 -#ifdef CONFIG_DEBUG_FS
 114 -static struct dentry *vc_mem_debugfs_entry;
 115 -#endif
 116 -
 117 -/*
 118 - * Videocore memory addresses and size
 119 - *
 120 - * Drivers that wish to know the videocore memory addresses and sizes should
 121 - * use these variables instead of the MM_IO_BASE and MM_ADDR_IO defines in
 122 - * headers. This allows the other drivers to not be tied down to a a certain
 123 - * address/size at compile time.
 124 - *
 125 - * In the future, the goal is to have the videocore memory virtual address and
 126 - * size be calculated at boot time rather than at compile time. The decision of
 127 - * where the videocore memory resides and its size would be in the hands of the
 128 - * bootloader (and/or kernel). When that happens, the values of these variables
 129 - * would be calculated and assigned in the init function.
 130 - */
 131 -// in the 2835 VC in mapped above ARM, but ARM has full access to VC space
 132 -unsigned long mm_vc_mem_phys_addr = 0x00000000;
 133 -unsigned int mm_vc_mem_size = 0;
 134 -unsigned int mm_vc_mem_base = 0;
 135 -
 136 -EXPORT_SYMBOL(mm_vc_mem_phys_addr);
 137 -EXPORT_SYMBOL(mm_vc_mem_size);
 138 -EXPORT_SYMBOL(mm_vc_mem_base);
 139 -
 140 -static uint phys_addr = 0;
 141 -static uint mem_size = 0;
 142 -static uint mem_base = 0;
 143 -
 144 -
 145 -/****************************************************************************
 146 -*
 147 -*   vc_mem_open
 148 -*
 149 -***************************************************************************/
 150 -
 151 -static int
 152 -vc_mem_open(struct inode *inode, struct file *file)
 153 -{
 154 -       (void) inode;
 155 -       (void) file;
 156 -
 157 -       pr_debug("%s: called file = 0x%p\n", __func__, file);
 158 -
 159 -       return 0;
 160 -}
 161 -
 162 -/****************************************************************************
 163 -*
 164 -*   vc_mem_release
 165 -*
 166 -***************************************************************************/
 167 -
 168 -static int
 169 -vc_mem_release(struct inode *inode, struct file *file)
 170 -{
 171 -       (void) inode;
 172 -       (void) file;
 173 -
 174 -       pr_debug("%s: called file = 0x%p\n", __func__, file);
 175 -
 176 -       return 0;
 177 -}
 178 -
 179 -/****************************************************************************
 180 -*
 181 -*   vc_mem_get_size
 182 -*
 183 -***************************************************************************/
 184 -
 185 -static void
 186 -vc_mem_get_size(void)
 187 -{
 188 -}
 189 -
 190 -/****************************************************************************
 191 -*
 192 -*   vc_mem_get_base
 193 -*
 194 -***************************************************************************/
 195 -
 196 -static void
 197 -vc_mem_get_base(void)
 198 -{
 199 -}
 200 -
 201 -/****************************************************************************
 202 -*
 203 -*   vc_mem_get_current_size
 204 -*
 205 -***************************************************************************/
 206 -
 207 -int
 208 -vc_mem_get_current_size(void)
 209 -{
 210 -       return mm_vc_mem_size;
 211 -}
 212 -
 213 -EXPORT_SYMBOL_GPL(vc_mem_get_current_size);
 214 -
 215 -/****************************************************************************
 216 -*
 217 -*   vc_mem_ioctl
 218 -*
 219 -***************************************************************************/
 220 -
 221 -static long
 222 -vc_mem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 223 -{
 224 -       int rc = 0;
 225 -
 226 -       (void) cmd;
 227 -       (void) arg;
 228 -
 229 -       pr_debug("%s: called file = 0x%p\n", __func__, file);
 230 -
 231 -       switch (cmd) {
 232 -       case VC_MEM_IOC_MEM_PHYS_ADDR:
 233 -               {
 234 -                       pr_debug("%s: VC_MEM_IOC_MEM_PHYS_ADDR=0x%p\n",
 235 -                               __func__, (void *) mm_vc_mem_phys_addr);
 236 -
 237 -                       if (copy_to_user((void *) arg, &mm_vc_mem_phys_addr,
 238 -                                        sizeof (mm_vc_mem_phys_addr)) != 0) {
 239 -                               rc = -EFAULT;
 240 -                       }
 241 -                       break;
 242 -               }
 243 -       case VC_MEM_IOC_MEM_SIZE:
 244 -               {
 245 -                       // Get the videocore memory size first
 246 -                       vc_mem_get_size();
 247 -
 248 -                       pr_debug("%s: VC_MEM_IOC_MEM_SIZE=%u\n", __func__,
 249 -                               mm_vc_mem_size);
 250 -
 251 -                       if (copy_to_user((void *) arg, &mm_vc_mem_size,
 252 -                                        sizeof (mm_vc_mem_size)) != 0) {
 253 -                               rc = -EFAULT;
 254 -                       }
 255 -                       break;
 256 -               }
 257 -       case VC_MEM_IOC_MEM_BASE:
 258 -               {
 259 -                       // Get the videocore memory base
 260 -                       vc_mem_get_base();
 261 -
 262 -                       pr_debug("%s: VC_MEM_IOC_MEM_BASE=%u\n", __func__,
 263 -                               mm_vc_mem_base);
 264 -
 265 -                       if (copy_to_user((void *) arg, &mm_vc_mem_base,
 266 -                                        sizeof (mm_vc_mem_base)) != 0) {
 267 -                               rc = -EFAULT;
 268 -                       }
 269 -                       break;
 270 -               }
 271 -       case VC_MEM_IOC_MEM_LOAD:
 272 -               {
 273 -                       // Get the videocore memory base
 274 -                       vc_mem_get_base();
 275 -
 276 -                       pr_debug("%s: VC_MEM_IOC_MEM_LOAD=%u\n", __func__,
 277 -                               mm_vc_mem_base);
 278 -
 279 -                       if (copy_to_user((void *) arg, &mm_vc_mem_base,
 280 -                                        sizeof (mm_vc_mem_base)) != 0) {
 281 -                               rc = -EFAULT;
 282 -                       }
 283 -                       break;
 284 -               }
 285 -       default:
 286 -               {
 287 -                       return -ENOTTY;
 288 -               }
 289 -       }
 290 -       pr_debug("%s: file = 0x%p returning %d\n", __func__, file, rc);
 291 -
 292 -       return rc;
 293 -}
 294 -
 295 -/****************************************************************************
 296 -*
 297 -*   vc_mem_mmap
 298 -*
 299 -***************************************************************************/
 300 -
 301 -static int
 302 -vc_mem_mmap(struct file *filp, struct vm_area_struct *vma)
 303 -{
 304 -       int rc = 0;
 305 -       unsigned long length = vma->vm_end - vma->vm_start;
 306 -       unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 307 -
 308 -       pr_debug("%s: vm_start = 0x%08lx vm_end = 0x%08lx vm_pgoff = 0x%08lx\n",
 309 -               __func__, (long) vma->vm_start, (long) vma->vm_end,
 310 -               (long) vma->vm_pgoff);
 311 -
 312 -       if (offset + length > mm_vc_mem_size) {
 313 -               pr_err("%s: length %ld is too big\n", __func__, length);
 314 -               return -EINVAL;
 315 -       }
 316 -       // Do not cache the memory map
 317 -       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 318 -
 319 -       rc = remap_pfn_range(vma, vma->vm_start,
 320 -                            (mm_vc_mem_phys_addr >> PAGE_SHIFT) +
 321 -                            vma->vm_pgoff, length, vma->vm_page_prot);
 322 -       if (rc != 0) {
 323 -               pr_err("%s: remap_pfn_range failed (rc=%d)\n", __func__, rc);
 324 -       }
 325 -
 326 -       return rc;
 327 -}
 328 -
 329 -/****************************************************************************
 330 -*
 331 -*   File Operations for the driver.
 332 -*
 333 -***************************************************************************/
 334 -
 335 -static const struct file_operations vc_mem_fops = {
 336 -       .owner = THIS_MODULE,
 337 -       .open = vc_mem_open,
 338 -       .release = vc_mem_release,
 339 -       .unlocked_ioctl = vc_mem_ioctl,
 340 -       .mmap = vc_mem_mmap,
 341 -};
 342 -
 343 -#ifdef CONFIG_DEBUG_FS
 344 -static void vc_mem_debugfs_deinit(void)
 345 -{
 346 -       debugfs_remove_recursive(vc_mem_debugfs_entry);
 347 -       vc_mem_debugfs_entry = NULL;
 348 -}
 349 -
 350 -
 351 -static int vc_mem_debugfs_init(
 352 -       struct device *dev)
 353 -{
 354 -       vc_mem_debugfs_entry = debugfs_create_dir(DRIVER_NAME, NULL);
 355 -       if (!vc_mem_debugfs_entry) {
 356 -               dev_warn(dev, "could not create debugfs entry\n");
 357 -               return -EFAULT;
 358 -       }
 359 -
 360 -       if (!debugfs_create_x32("vc_mem_phys_addr",
 361 -                               0444,
 362 -                               vc_mem_debugfs_entry,
 363 -                               (u32 *)&mm_vc_mem_phys_addr)) {
 364 -               dev_warn(dev, "%s:could not create vc_mem_phys entry\n",
 365 -                       __func__);
 366 -               goto fail;
 367 -       }
 368 -
 369 -       if (!debugfs_create_x32("vc_mem_size",
 370 -                               0444,
 371 -                               vc_mem_debugfs_entry,
 372 -                               (u32 *)&mm_vc_mem_size)) {
 373 -               dev_warn(dev, "%s:could not create vc_mem_size entry\n",
 374 -                       __func__);
 375 -               goto fail;
 376 -       }
 377 -
 378 -       if (!debugfs_create_x32("vc_mem_base",
 379 -                               0444,
 380 -                               vc_mem_debugfs_entry,
 381 -                               (u32 *)&mm_vc_mem_base)) {
 382 -               dev_warn(dev, "%s:could not create vc_mem_base entry\n",
 383 -                        __func__);
 384 -               goto fail;
 385 -       }
 386 -
 387 -       return 0;
 388 -
 389 -fail:
 390 -       vc_mem_debugfs_deinit();
 391 -       return -EFAULT;
 392 -}
 393 -
 394 -#endif /* CONFIG_DEBUG_FS */
 395 -
 396 -
 397 -/****************************************************************************
 398 -*
 399 -*   vc_mem_init
 400 -*
 401 -***************************************************************************/
 402 -
 403 -static int __init
 404 -vc_mem_init(void)
 405 -{
 406 -       int rc = -EFAULT;
 407 -       struct device *dev;
 408 -
 409 -       pr_debug("%s: called\n", __func__);
 410 -
 411 -       mm_vc_mem_phys_addr = phys_addr;
 412 -       mm_vc_mem_size = mem_size;
 413 -       mm_vc_mem_base = mem_base;
 414 -
 415 -       vc_mem_get_size();
 416 -
 417 -       pr_info("vc-mem: phys_addr:0x%08lx mem_base=0x%08x mem_size:0x%08x(%u MiB)\n",
 418 -               mm_vc_mem_phys_addr, mm_vc_mem_base, mm_vc_mem_size, mm_vc_mem_size / (1024 * 1024));
 419 -
 420 -       if ((rc = alloc_chrdev_region(&vc_mem_devnum, 0, 1, DRIVER_NAME)) < 0) {
 421 -               pr_err("%s: alloc_chrdev_region failed (rc=%d)\n",
 422 -                      __func__, rc);
 423 -               goto out_err;
 424 -       }
 425 -
 426 -       cdev_init(&vc_mem_cdev, &vc_mem_fops);
 427 -       if ((rc = cdev_add(&vc_mem_cdev, vc_mem_devnum, 1)) != 0) {
 428 -               pr_err("%s: cdev_add failed (rc=%d)\n", __func__, rc);
 429 -               goto out_unregister;
 430 -       }
 431 -
 432 -       vc_mem_class = class_create(THIS_MODULE, DRIVER_NAME);
 433 -       if (IS_ERR(vc_mem_class)) {
 434 -               rc = PTR_ERR(vc_mem_class);
 435 -               pr_err("%s: class_create failed (rc=%d)\n", __func__, rc);
 436 -               goto out_cdev_del;
 437 -       }
 438 -
 439 -       dev = device_create(vc_mem_class, NULL, vc_mem_devnum, NULL,
 440 -                           DRIVER_NAME);
 441 -       if (IS_ERR(dev)) {
 442 -               rc = PTR_ERR(dev);
 443 -               pr_err("%s: device_create failed (rc=%d)\n", __func__, rc);
 444 -               goto out_class_destroy;
 445 -       }
 446 -
 447 -#ifdef CONFIG_DEBUG_FS
 448 -       /* don't fail if the debug entries cannot be created */
 449 -       vc_mem_debugfs_init(dev);
 450 -#endif
 451 -
 452 -       vc_mem_inited = 1;
 453 -       return 0;
 454 -
 455 -       device_destroy(vc_mem_class, vc_mem_devnum);
 456 -
 457 -      out_class_destroy:
 458 -       class_destroy(vc_mem_class);
 459 -       vc_mem_class = NULL;
 460 -
 461 -      out_cdev_del:
 462 -       cdev_del(&vc_mem_cdev);
 463 -
 464 -      out_unregister:
 465 -       unregister_chrdev_region(vc_mem_devnum, 1);
 466 -
 467 -      out_err:
 468 -       return -1;
 469 -}
 470 -
 471 -/****************************************************************************
 472 -*
 473 -*   vc_mem_exit
 474 -*
 475 -***************************************************************************/
 476 -
 477 -static void __exit
 478 -vc_mem_exit(void)
 479 -{
 480 -       pr_debug("%s: called\n", __func__);
 481 -
 482 -       if (vc_mem_inited) {
 483 -#if CONFIG_DEBUG_FS
 484 -               vc_mem_debugfs_deinit();
 485 -#endif
 486 -               device_destroy(vc_mem_class, vc_mem_devnum);
 487 -               class_destroy(vc_mem_class);
 488 -               cdev_del(&vc_mem_cdev);
 489 -               unregister_chrdev_region(vc_mem_devnum, 1);
 490 -       }
 491 -}
 492 -
 493 -module_init(vc_mem_init);
 494 -module_exit(vc_mem_exit);
 495 -MODULE_LICENSE("GPL");
 496 -MODULE_AUTHOR("Broadcom Corporation");
 497 -
 498 -module_param(phys_addr, uint, 0644);
 499 -module_param(mem_size, uint, 0644);
 500 -module_param(mem_base, uint, 0644);
 501 --- a/drivers/char/broadcom/Kconfig
 502 +++ b/drivers/char/broadcom/Kconfig
 503 @@ -7,9 +7,19 @@ menuconfig BRCM_CHAR_DRIVERS
 504         help
 505           Broadcom's char drivers
 506
 507 +if BRCM_CHAR_DRIVERS
 508 +
 509  config BCM_VC_CMA
 510         bool "Videocore CMA"
 511 -       depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
 512 +       depends on CMA && BCM2708_VCHIQ
 513         default n
 514          help
 515            Helper for videocore CMA access.
 516 +
 517 +config BCM2708_VCMEM
 518 +       bool "Videocore Memory"
 519 +        default y
 520 +        help
 521 +          Helper for videocore memory access and total size allocation.
 522 +
 523 +endif
 524 --- a/drivers/char/broadcom/Makefile
 525 +++ b/drivers/char/broadcom/Makefile
 526 @@ -1 +1,2 @@
 527  obj-$(CONFIG_BCM_VC_CMA)       += vc_cma/
 528 +obj-$(CONFIG_BCM2708_VCMEM)    += vc_mem.o
 529 --- /dev/null
 530 +++ b/drivers/char/broadcom/vc_mem.c
 531 @@ -0,0 +1,422 @@
 532 +/*****************************************************************************
 533 +* Copyright 2010 - 2011 Broadcom Corporation.  All rights reserved.
 534 +*
 535 +* Unless you and Broadcom execute a separate written software license
 536 +* agreement governing use of this software, this software is licensed to you
 537 +* under the terms of the GNU General Public License version 2, available at
 538 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
 539 +*
 540 +* Notwithstanding the above, under no circumstances may you combine this
 541 +* software in any way with any other Broadcom software provided under a
 542 +* license other than the GPL, without Broadcom's express prior written
 543 +* consent.
 544 +*****************************************************************************/
 545 +
 546 +#include <linux/kernel.h>
 547 +#include <linux/module.h>
 548 +#include <linux/fs.h>
 549 +#include <linux/device.h>
 550 +#include <linux/cdev.h>
 551 +#include <linux/mm.h>
 552 +#include <linux/slab.h>
 553 +#include <linux/debugfs.h>
 554 +#include <asm/uaccess.h>
 555 +#include <linux/dma-mapping.h>
 556 +#include <linux/broadcom/vc_mem.h>
 557 +
 558 +#define DRIVER_NAME  "vc-mem"
 559 +
 560 +// Device (/dev) related variables
 561 +static dev_t vc_mem_devnum = 0;
 562 +static struct class *vc_mem_class = NULL;
 563 +static struct cdev vc_mem_cdev;
 564 +static int vc_mem_inited = 0;
 565 +
 566 +#ifdef CONFIG_DEBUG_FS
 567 +static struct dentry *vc_mem_debugfs_entry;
 568 +#endif
 569 +
 570 +/*
 571 + * Videocore memory addresses and size
 572 + *
 573 + * Drivers that wish to know the videocore memory addresses and sizes should
 574 + * use these variables instead of the MM_IO_BASE and MM_ADDR_IO defines in
 575 + * headers. This allows the other drivers to not be tied down to a a certain
 576 + * address/size at compile time.
 577 + *
 578 + * In the future, the goal is to have the videocore memory virtual address and
 579 + * size be calculated at boot time rather than at compile time. The decision of
 580 + * where the videocore memory resides and its size would be in the hands of the
 581 + * bootloader (and/or kernel). When that happens, the values of these variables
 582 + * would be calculated and assigned in the init function.
 583 + */
 584 +// in the 2835 VC in mapped above ARM, but ARM has full access to VC space
 585 +unsigned long mm_vc_mem_phys_addr = 0x00000000;
 586 +unsigned int mm_vc_mem_size = 0;
 587 +unsigned int mm_vc_mem_base = 0;
 588 +
 589 +EXPORT_SYMBOL(mm_vc_mem_phys_addr);
 590 +EXPORT_SYMBOL(mm_vc_mem_size);
 591 +EXPORT_SYMBOL(mm_vc_mem_base);
 592 +
 593 +static uint phys_addr = 0;
 594 +static uint mem_size = 0;
 595 +static uint mem_base = 0;
 596 +
 597 +
 598 +/****************************************************************************
 599 +*
 600 +*   vc_mem_open
 601 +*
 602 +***************************************************************************/
 603 +
 604 +static int
 605 +vc_mem_open(struct inode *inode, struct file *file)
 606 +{
 607 +       (void) inode;
 608 +       (void) file;
 609 +
 610 +       pr_debug("%s: called file = 0x%p\n", __func__, file);
 611 +
 612 +       return 0;
 613 +}
 614 +
 615 +/****************************************************************************
 616 +*
 617 +*   vc_mem_release
 618 +*
 619 +***************************************************************************/
 620 +
 621 +static int
 622 +vc_mem_release(struct inode *inode, struct file *file)
 623 +{
 624 +       (void) inode;
 625 +       (void) file;
 626 +
 627 +       pr_debug("%s: called file = 0x%p\n", __func__, file);
 628 +
 629 +       return 0;
 630 +}
 631 +
 632 +/****************************************************************************
 633 +*
 634 +*   vc_mem_get_size
 635 +*
 636 +***************************************************************************/
 637 +
 638 +static void
 639 +vc_mem_get_size(void)
 640 +{
 641 +}
 642 +
 643 +/****************************************************************************
 644 +*
 645 +*   vc_mem_get_base
 646 +*
 647 +***************************************************************************/
 648 +
 649 +static void
 650 +vc_mem_get_base(void)
 651 +{
 652 +}
 653 +
 654 +/****************************************************************************
 655 +*
 656 +*   vc_mem_get_current_size
 657 +*
 658 +***************************************************************************/
 659 +
 660 +int
 661 +vc_mem_get_current_size(void)
 662 +{
 663 +       return mm_vc_mem_size;
 664 +}
 665 +
 666 +EXPORT_SYMBOL_GPL(vc_mem_get_current_size);
 667 +
 668 +/****************************************************************************
 669 +*
 670 +*   vc_mem_ioctl
 671 +*
 672 +***************************************************************************/
 673 +
 674 +static long
 675 +vc_mem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 676 +{
 677 +       int rc = 0;
 678 +
 679 +       (void) cmd;
 680 +       (void) arg;
 681 +
 682 +       pr_debug("%s: called file = 0x%p\n", __func__, file);
 683 +
 684 +       switch (cmd) {
 685 +       case VC_MEM_IOC_MEM_PHYS_ADDR:
 686 +               {
 687 +                       pr_debug("%s: VC_MEM_IOC_MEM_PHYS_ADDR=0x%p\n",
 688 +                               __func__, (void *) mm_vc_mem_phys_addr);
 689 +
 690 +                       if (copy_to_user((void *) arg, &mm_vc_mem_phys_addr,
 691 +                                        sizeof (mm_vc_mem_phys_addr)) != 0) {
 692 +                               rc = -EFAULT;
 693 +                       }
 694 +                       break;
 695 +               }
 696 +       case VC_MEM_IOC_MEM_SIZE:
 697 +               {
 698 +                       // Get the videocore memory size first
 699 +                       vc_mem_get_size();
 700 +
 701 +                       pr_debug("%s: VC_MEM_IOC_MEM_SIZE=%u\n", __func__,
 702 +                               mm_vc_mem_size);
 703 +
 704 +                       if (copy_to_user((void *) arg, &mm_vc_mem_size,
 705 +                                        sizeof (mm_vc_mem_size)) != 0) {
 706 +                               rc = -EFAULT;
 707 +                       }
 708 +                       break;
 709 +               }
 710 +       case VC_MEM_IOC_MEM_BASE:
 711 +               {
 712 +                       // Get the videocore memory base
 713 +                       vc_mem_get_base();
 714 +
 715 +                       pr_debug("%s: VC_MEM_IOC_MEM_BASE=%u\n", __func__,
 716 +                               mm_vc_mem_base);
 717 +
 718 +                       if (copy_to_user((void *) arg, &mm_vc_mem_base,
 719 +                                        sizeof (mm_vc_mem_base)) != 0) {
 720 +                               rc = -EFAULT;
 721 +                       }
 722 +                       break;
 723 +               }
 724 +       case VC_MEM_IOC_MEM_LOAD:
 725 +               {
 726 +                       // Get the videocore memory base
 727 +                       vc_mem_get_base();
 728 +
 729 +                       pr_debug("%s: VC_MEM_IOC_MEM_LOAD=%u\n", __func__,
 730 +                               mm_vc_mem_base);
 731 +
 732 +                       if (copy_to_user((void *) arg, &mm_vc_mem_base,
 733 +                                        sizeof (mm_vc_mem_base)) != 0) {
 734 +                               rc = -EFAULT;
 735 +                       }
 736 +                       break;
 737 +               }
 738 +       default:
 739 +               {
 740 +                       return -ENOTTY;
 741 +               }
 742 +       }
 743 +       pr_debug("%s: file = 0x%p returning %d\n", __func__, file, rc);
 744 +
 745 +       return rc;
 746 +}
 747 +
 748 +/****************************************************************************
 749 +*
 750 +*   vc_mem_mmap
 751 +*
 752 +***************************************************************************/
 753 +
 754 +static int
 755 +vc_mem_mmap(struct file *filp, struct vm_area_struct *vma)
 756 +{
 757 +       int rc = 0;
 758 +       unsigned long length = vma->vm_end - vma->vm_start;
 759 +       unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 760 +
 761 +       pr_debug("%s: vm_start = 0x%08lx vm_end = 0x%08lx vm_pgoff = 0x%08lx\n",
 762 +               __func__, (long) vma->vm_start, (long) vma->vm_end,
 763 +               (long) vma->vm_pgoff);
 764 +
 765 +       if (offset + length > mm_vc_mem_size) {
 766 +               pr_err("%s: length %ld is too big\n", __func__, length);
 767 +               return -EINVAL;
 768 +       }
 769 +       // Do not cache the memory map
 770 +       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 771 +
 772 +       rc = remap_pfn_range(vma, vma->vm_start,
 773 +                            (mm_vc_mem_phys_addr >> PAGE_SHIFT) +
 774 +                            vma->vm_pgoff, length, vma->vm_page_prot);
 775 +       if (rc != 0) {
 776 +               pr_err("%s: remap_pfn_range failed (rc=%d)\n", __func__, rc);
 777 +       }
 778 +
 779 +       return rc;
 780 +}
 781 +
 782 +/****************************************************************************
 783 +*
 784 +*   File Operations for the driver.
 785 +*
 786 +***************************************************************************/
 787 +
 788 +static const struct file_operations vc_mem_fops = {
 789 +       .owner = THIS_MODULE,
 790 +       .open = vc_mem_open,
 791 +       .release = vc_mem_release,
 792 +       .unlocked_ioctl = vc_mem_ioctl,
 793 +       .mmap = vc_mem_mmap,
 794 +};
 795 +
 796 +#ifdef CONFIG_DEBUG_FS
 797 +static void vc_mem_debugfs_deinit(void)
 798 +{
 799 +       debugfs_remove_recursive(vc_mem_debugfs_entry);
 800 +       vc_mem_debugfs_entry = NULL;
 801 +}
 802 +
 803 +
 804 +static int vc_mem_debugfs_init(
 805 +       struct device *dev)
 806 +{
 807 +       vc_mem_debugfs_entry = debugfs_create_dir(DRIVER_NAME, NULL);
 808 +       if (!vc_mem_debugfs_entry) {
 809 +               dev_warn(dev, "could not create debugfs entry\n");
 810 +               return -EFAULT;
 811 +       }
 812 +
 813 +       if (!debugfs_create_x32("vc_mem_phys_addr",
 814 +                               0444,
 815 +                               vc_mem_debugfs_entry,
 816 +                               (u32 *)&mm_vc_mem_phys_addr)) {
 817 +               dev_warn(dev, "%s:could not create vc_mem_phys entry\n",
 818 +                       __func__);
 819 +               goto fail;
 820 +       }
 821 +
 822 +       if (!debugfs_create_x32("vc_mem_size",
 823 +                               0444,
 824 +                               vc_mem_debugfs_entry,
 825 +                               (u32 *)&mm_vc_mem_size)) {
 826 +               dev_warn(dev, "%s:could not create vc_mem_size entry\n",
 827 +                       __func__);
 828 +               goto fail;
 829 +       }
 830 +
 831 +       if (!debugfs_create_x32("vc_mem_base",
 832 +                               0444,
 833 +                               vc_mem_debugfs_entry,
 834 +                               (u32 *)&mm_vc_mem_base)) {
 835 +               dev_warn(dev, "%s:could not create vc_mem_base entry\n",
 836 +                        __func__);
 837 +               goto fail;
 838 +       }
 839 +
 840 +       return 0;
 841 +
 842 +fail:
 843 +       vc_mem_debugfs_deinit();
 844 +       return -EFAULT;
 845 +}
 846 +
 847 +#endif /* CONFIG_DEBUG_FS */
 848 +
 849 +
 850 +/****************************************************************************
 851 +*
 852 +*   vc_mem_init
 853 +*
 854 +***************************************************************************/
 855 +
 856 +static int __init
 857 +vc_mem_init(void)
 858 +{
 859 +       int rc = -EFAULT;
 860 +       struct device *dev;
 861 +
 862 +       pr_debug("%s: called\n", __func__);
 863 +
 864 +       mm_vc_mem_phys_addr = phys_addr;
 865 +       mm_vc_mem_size = mem_size;
 866 +       mm_vc_mem_base = mem_base;
 867 +
 868 +       vc_mem_get_size();
 869 +
 870 +       pr_info("vc-mem: phys_addr:0x%08lx mem_base=0x%08x mem_size:0x%08x(%u MiB)\n",
 871 +               mm_vc_mem_phys_addr, mm_vc_mem_base, mm_vc_mem_size, mm_vc_mem_size / (1024 * 1024));
 872 +
 873 +       if ((rc = alloc_chrdev_region(&vc_mem_devnum, 0, 1, DRIVER_NAME)) < 0) {
 874 +               pr_err("%s: alloc_chrdev_region failed (rc=%d)\n",
 875 +                      __func__, rc);
 876 +               goto out_err;
 877 +       }
 878 +
 879 +       cdev_init(&vc_mem_cdev, &vc_mem_fops);
 880 +       if ((rc = cdev_add(&vc_mem_cdev, vc_mem_devnum, 1)) != 0) {
 881 +               pr_err("%s: cdev_add failed (rc=%d)\n", __func__, rc);
 882 +               goto out_unregister;
 883 +       }
 884 +
 885 +       vc_mem_class = class_create(THIS_MODULE, DRIVER_NAME);
 886 +       if (IS_ERR(vc_mem_class)) {
 887 +               rc = PTR_ERR(vc_mem_class);
 888 +               pr_err("%s: class_create failed (rc=%d)\n", __func__, rc);
 889 +               goto out_cdev_del;
 890 +       }
 891 +
 892 +       dev = device_create(vc_mem_class, NULL, vc_mem_devnum, NULL,
 893 +                           DRIVER_NAME);
 894 +       if (IS_ERR(dev)) {
 895 +               rc = PTR_ERR(dev);
 896 +               pr_err("%s: device_create failed (rc=%d)\n", __func__, rc);
 897 +               goto out_class_destroy;
 898 +       }
 899 +
 900 +#ifdef CONFIG_DEBUG_FS
 901 +       /* don't fail if the debug entries cannot be created */
 902 +       vc_mem_debugfs_init(dev);
 903 +#endif
 904 +
 905 +       vc_mem_inited = 1;
 906 +       return 0;
 907 +
 908 +       device_destroy(vc_mem_class, vc_mem_devnum);
 909 +
 910 +      out_class_destroy:
 911 +       class_destroy(vc_mem_class);
 912 +       vc_mem_class = NULL;
 913 +
 914 +      out_cdev_del:
 915 +       cdev_del(&vc_mem_cdev);
 916 +
 917 +      out_unregister:
 918 +       unregister_chrdev_region(vc_mem_devnum, 1);
 919 +
 920 +      out_err:
 921 +       return -1;
 922 +}
 923 +
 924 +/****************************************************************************
 925 +*
 926 +*   vc_mem_exit
 927 +*
 928 +***************************************************************************/
 929 +
 930 +static void __exit
 931 +vc_mem_exit(void)
 932 +{
 933 +       pr_debug("%s: called\n", __func__);
 934 +
 935 +       if (vc_mem_inited) {
 936 +#if CONFIG_DEBUG_FS
 937 +               vc_mem_debugfs_deinit();
 938 +#endif
 939 +               device_destroy(vc_mem_class, vc_mem_devnum);
 940 +               class_destroy(vc_mem_class);
 941 +               cdev_del(&vc_mem_cdev);
 942 +               unregister_chrdev_region(vc_mem_devnum, 1);
 943 +       }
 944 +}
 945 +
 946 +module_init(vc_mem_init);
 947 +module_exit(vc_mem_exit);
 948 +MODULE_LICENSE("GPL");
 949 +MODULE_AUTHOR("Broadcom Corporation");
 950 +
 951 +module_param(phys_addr, uint, 0644);
 952 +module_param(mem_size, uint, 0644);
 953 +module_param(mem_base, uint, 0644);
 954 --- /dev/null
 955 +++ b/include/linux/broadcom/vc_mem.h
 956 @@ -0,0 +1,35 @@
 957 +/*****************************************************************************
 958 +* Copyright 2010 - 2011 Broadcom Corporation.  All rights reserved.
 959 +*
 960 +* Unless you and Broadcom execute a separate written software license
 961 +* agreement governing use of this software, this software is licensed to you
 962 +* under the terms of the GNU General Public License version 2, available at
 963 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
 964 +*
 965 +* Notwithstanding the above, under no circumstances may you combine this
 966 +* software in any way with any other Broadcom software provided under a
 967 +* license other than the GPL, without Broadcom's express prior written
 968 +* consent.
 969 +*****************************************************************************/
 970 +
 971 +#ifndef _VC_MEM_H
 972 +#define _VC_MEM_H
 973 +
 974 +#include <linux/ioctl.h>
 975 +
 976 +#define VC_MEM_IOC_MAGIC  'v'
 977 +
 978 +#define VC_MEM_IOC_MEM_PHYS_ADDR    _IOR( VC_MEM_IOC_MAGIC, 0, unsigned long )
 979 +#define VC_MEM_IOC_MEM_SIZE         _IOR( VC_MEM_IOC_MAGIC, 1, unsigned int )
 980 +#define VC_MEM_IOC_MEM_BASE         _IOR( VC_MEM_IOC_MAGIC, 2, unsigned int )
 981 +#define VC_MEM_IOC_MEM_LOAD         _IOR( VC_MEM_IOC_MAGIC, 3, unsigned int )
 982 +
 983 +#if defined( __KERNEL__ )
 984 +#define VC_MEM_TO_ARM_ADDR_MASK 0x3FFFFFFF
 985 +
 986 +extern unsigned long mm_vc_mem_phys_addr;
 987 +extern unsigned int  mm_vc_mem_size;
 988 +extern int vc_mem_get_current_size( void );
 989 +#endif
 990 +
 991 +#endif  /* _VC_MEM_H */