target/linux/bcm27xx/patches-5.15/950-0072-vc_mem-Add-vc_mem-driver-for-querying-firmware-memor.patch

   1 From 47c1d1988df17bf39bbf3a188d78792eaa693068 Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Fri, 28 Oct 2016 15:36:43 +0100
   4 Subject: [PATCH] vc_mem: Add vc_mem driver for querying firmware
   5  memory addresses
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 Signed-off-by: popcornmix <popcornmix@gmail.com>
  11
  12 BCM270x: Move vc_mem
  13
  14 Make the vc_mem module available for ARCH_BCM2835 by moving it.
  15
  16 Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
  17
  18 char: vc_mem: Fix up compat ioctls for 64bit kernel
  19
  20 compat_ioctl wasn't defined, so 32bit user/64bit kernel
  21 always failed.
  22 VC_MEM_IOC_MEM_PHYS_ADDR was defined with parameter size
  23 unsigned long, so the ioctl cmd changes between sizes.
  24
  25 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  26
  27 char: vc_mem: Fix all coding style issues.
  28
  29 Cleans up all checkpatch errors in vc_mem.c and vc_mem.h
  30 No functional change to the code.
  31
  32 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  33
  34 char: vc_mem: Delete dead code
  35
  36 There are no error exists once device_create has succeeded, and
  37 therefore no need to call device_destroy from vc_mem_init.
  38
  39 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  40 ---
  41  drivers/char/broadcom/Kconfig   |  18 ++
  42  drivers/char/broadcom/Makefile  |   1 +
  43  drivers/char/broadcom/vc_mem.c  | 373 ++++++++++++++++++++++++++++++++
  44  include/linux/broadcom/vc_mem.h |  39 ++++
  45  4 files changed, 431 insertions(+)
  46  create mode 100644 drivers/char/broadcom/Kconfig
  47  create mode 100644 drivers/char/broadcom/Makefile
  48  create mode 100644 drivers/char/broadcom/vc_mem.c
  49  create mode 100644 include/linux/broadcom/vc_mem.h
  50
  51 --- /dev/null
  52 +++ b/drivers/char/broadcom/Kconfig
  53 @@ -0,0 +1,18 @@
  54 +#
  55 +# Broadcom char driver config
  56 +#
  57 +
  58 +menuconfig BRCM_CHAR_DRIVERS
  59 +       bool "Broadcom Char Drivers"
  60 +       help
  61 +         Broadcom's char drivers
  62 +
  63 +if BRCM_CHAR_DRIVERS
  64 +
  65 +config BCM2708_VCMEM
  66 +       bool "Videocore Memory"
  67 +        default y
  68 +        help
  69 +          Helper for videocore memory access and total size allocation.
  70 +
  71 +endif
  72 --- /dev/null
  73 +++ b/drivers/char/broadcom/Makefile
  74 @@ -0,0 +1 @@
  75 +obj-$(CONFIG_BCM2708_VCMEM)    += vc_mem.o
  76 --- /dev/null
  77 +++ b/drivers/char/broadcom/vc_mem.c
  78 @@ -0,0 +1,373 @@
  79 +/*
  80 + * Copyright 2010 - 2011 Broadcom Corporation.  All rights reserved.
  81 + *
  82 + * Unless you and Broadcom execute a separate written software license
  83 + * agreement governing use of this software, this software is licensed to you
  84 + * under the terms of the GNU General Public License version 2, available at
  85 + * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
  86 + *
  87 + * Notwithstanding the above, under no circumstances may you combine this
  88 + * software in any way with any other Broadcom software provided under a
  89 + * license other than the GPL, without Broadcom's express prior written
  90 + * consent.
  91 + */
  92 +
  93 +#include <linux/kernel.h>
  94 +#include <linux/module.h>
  95 +#include <linux/fs.h>
  96 +#include <linux/device.h>
  97 +#include <linux/cdev.h>
  98 +#include <linux/mm.h>
  99 +#include <linux/slab.h>
 100 +#include <linux/debugfs.h>
 101 +#include <linux/uaccess.h>
 102 +#include <linux/dma-mapping.h>
 103 +#include <linux/broadcom/vc_mem.h>
 104 +
 105 +#define DRIVER_NAME  "vc-mem"
 106 +
 107 +/* Device (/dev) related variables */
 108 +static dev_t vc_mem_devnum;
 109 +static struct class *vc_mem_class;
 110 +static struct cdev vc_mem_cdev;
 111 +static int vc_mem_inited;
 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;
 133 +EXPORT_SYMBOL(mm_vc_mem_phys_addr);
 134 +unsigned int mm_vc_mem_size;
 135 +EXPORT_SYMBOL(mm_vc_mem_size);
 136 +unsigned int mm_vc_mem_base;
 137 +EXPORT_SYMBOL(mm_vc_mem_base);
 138 +
 139 +static uint phys_addr;
 140 +static uint mem_size;
 141 +static uint mem_base;
 142 +
 143 +static int
 144 +vc_mem_open(struct inode *inode, struct file *file)
 145 +{
 146 +       (void)inode;
 147 +
 148 +       pr_debug("%s: called file = 0x%p\n", __func__, file);
 149 +
 150 +       return 0;
 151 +}
 152 +
 153 +static int
 154 +vc_mem_release(struct inode *inode, struct file *file)
 155 +{
 156 +       (void)inode;
 157 +
 158 +       pr_debug("%s: called file = 0x%p\n", __func__, file);
 159 +
 160 +       return 0;
 161 +}
 162 +
 163 +static void
 164 +vc_mem_get_size(void)
 165 +{
 166 +}
 167 +
 168 +static void
 169 +vc_mem_get_base(void)
 170 +{
 171 +}
 172 +
 173 +int
 174 +vc_mem_get_current_size(void)
 175 +{
 176 +       return mm_vc_mem_size;
 177 +}
 178 +EXPORT_SYMBOL_GPL(vc_mem_get_current_size);
 179 +
 180 +static long
 181 +vc_mem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 182 +{
 183 +       int rc = 0;
 184 +
 185 +       (void) cmd;
 186 +       (void) arg;
 187 +
 188 +       pr_debug("%s: called file = 0x%p, cmd %08x\n", __func__, file, cmd);
 189 +
 190 +       switch (cmd) {
 191 +       case VC_MEM_IOC_MEM_PHYS_ADDR:
 192 +               {
 193 +                       pr_debug("%s: VC_MEM_IOC_MEM_PHYS_ADDR=0x%p\n",
 194 +                               __func__, (void *)mm_vc_mem_phys_addr);
 195 +
 196 +                       if (copy_to_user((void *)arg, &mm_vc_mem_phys_addr,
 197 +                                        sizeof(mm_vc_mem_phys_addr))) {
 198 +                               rc = -EFAULT;
 199 +                       }
 200 +                       break;
 201 +               }
 202 +       case VC_MEM_IOC_MEM_SIZE:
 203 +               {
 204 +                       /* Get the videocore memory size first */
 205 +                       vc_mem_get_size();
 206 +
 207 +                       pr_debug("%s: VC_MEM_IOC_MEM_SIZE=%x\n", __func__,
 208 +                                mm_vc_mem_size);
 209 +
 210 +                       if (copy_to_user((void *)arg, &mm_vc_mem_size,
 211 +                                        sizeof(mm_vc_mem_size))) {
 212 +                               rc = -EFAULT;
 213 +                       }
 214 +                       break;
 215 +               }
 216 +       case VC_MEM_IOC_MEM_BASE:
 217 +               {
 218 +                       /* Get the videocore memory base */
 219 +                       vc_mem_get_base();
 220 +
 221 +                       pr_debug("%s: VC_MEM_IOC_MEM_BASE=%x\n", __func__,
 222 +                                mm_vc_mem_base);
 223 +
 224 +                       if (copy_to_user((void *)arg, &mm_vc_mem_base,
 225 +                                        sizeof(mm_vc_mem_base))) {
 226 +                               rc = -EFAULT;
 227 +                       }
 228 +                       break;
 229 +               }
 230 +       case VC_MEM_IOC_MEM_LOAD:
 231 +               {
 232 +                       /* Get the videocore memory base */
 233 +                       vc_mem_get_base();
 234 +
 235 +                       pr_debug("%s: VC_MEM_IOC_MEM_LOAD=%x\n", __func__,
 236 +                               mm_vc_mem_base);
 237 +
 238 +                       if (copy_to_user((void *)arg, &mm_vc_mem_base,
 239 +                                        sizeof(mm_vc_mem_base))) {
 240 +                               rc = -EFAULT;
 241 +                       }
 242 +                       break;
 243 +               }
 244 +       default:
 245 +               {
 246 +                       return -ENOTTY;
 247 +               }
 248 +       }
 249 +       pr_debug("%s: file = 0x%p returning %d\n", __func__, file, rc);
 250 +
 251 +       return rc;
 252 +}
 253 +
 254 +#ifdef CONFIG_COMPAT
 255 +static long
 256 +vc_mem_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 257 +{
 258 +       int rc = 0;
 259 +
 260 +       switch (cmd) {
 261 +       case VC_MEM_IOC_MEM_PHYS_ADDR32:
 262 +               pr_debug("%s: VC_MEM_IOC_MEM_PHYS_ADDR32=0x%p\n",
 263 +                        __func__, (void *)mm_vc_mem_phys_addr);
 264 +
 265 +               /* This isn't correct, but will cover us for now as
 266 +                * VideoCore is 32bit only.
 267 +                */
 268 +               if (copy_to_user((void *)arg, &mm_vc_mem_phys_addr,
 269 +                                sizeof(compat_ulong_t)))
 270 +                       rc = -EFAULT;
 271 +
 272 +               break;
 273 +
 274 +       default:
 275 +               rc = vc_mem_ioctl(file, cmd, arg);
 276 +               break;
 277 +       }
 278 +
 279 +       return rc;
 280 +}
 281 +#endif
 282 +
 283 +static int
 284 +vc_mem_mmap(struct file *filp, struct vm_area_struct *vma)
 285 +{
 286 +       int rc = 0;
 287 +       unsigned long length = vma->vm_end - vma->vm_start;
 288 +       unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 289 +
 290 +       pr_debug("%s: vm_start = 0x%08lx vm_end = 0x%08lx vm_pgoff = 0x%08lx\n",
 291 +                __func__, (long)vma->vm_start, (long)vma->vm_end,
 292 +                (long)vma->vm_pgoff);
 293 +
 294 +       if (offset + length > mm_vc_mem_size) {
 295 +               pr_err("%s: length %ld is too big\n", __func__, length);
 296 +               return -EINVAL;
 297 +       }
 298 +       /* Do not cache the memory map */
 299 +       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 300 +
 301 +       rc = remap_pfn_range(vma, vma->vm_start,
 302 +                            (mm_vc_mem_phys_addr >> PAGE_SHIFT) +
 303 +                            vma->vm_pgoff, length, vma->vm_page_prot);
 304 +       if (rc)
 305 +               pr_err("%s: remap_pfn_range failed (rc=%d)\n", __func__, rc);
 306 +
 307 +       return rc;
 308 +}
 309 +
 310 +/* File Operations for the driver. */
 311 +static const struct file_operations vc_mem_fops = {
 312 +       .owner = THIS_MODULE,
 313 +       .open = vc_mem_open,
 314 +       .release = vc_mem_release,
 315 +       .unlocked_ioctl = vc_mem_ioctl,
 316 +#ifdef CONFIG_COMPAT
 317 +       .compat_ioctl = vc_mem_compat_ioctl,
 318 +#endif
 319 +       .mmap = vc_mem_mmap,
 320 +};
 321 +
 322 +#ifdef CONFIG_DEBUG_FS
 323 +static void vc_mem_debugfs_deinit(void)
 324 +{
 325 +       debugfs_remove_recursive(vc_mem_debugfs_entry);
 326 +       vc_mem_debugfs_entry = NULL;
 327 +}
 328 +
 329 +
 330 +static int vc_mem_debugfs_init(
 331 +       struct device *dev)
 332 +{
 333 +       vc_mem_debugfs_entry = debugfs_create_dir(DRIVER_NAME, NULL);
 334 +       if (!vc_mem_debugfs_entry) {
 335 +               dev_warn(dev, "could not create debugfs entry\n");
 336 +               return -EFAULT;
 337 +       }
 338 +
 339 +       debugfs_create_x32("vc_mem_phys_addr",
 340 +                               0444,
 341 +                               vc_mem_debugfs_entry,
 342 +                               (u32 *)&mm_vc_mem_phys_addr);
 343 +       debugfs_create_x32("vc_mem_size",
 344 +                               0444,
 345 +                               vc_mem_debugfs_entry,
 346 +                               (u32 *)&mm_vc_mem_size);
 347 +       debugfs_create_x32("vc_mem_base",
 348 +                               0444,
 349 +                               vc_mem_debugfs_entry,
 350 +                               (u32 *)&mm_vc_mem_base);
 351 +
 352 +       return 0;
 353 +}
 354 +
 355 +#endif /* CONFIG_DEBUG_FS */
 356 +
 357 +/* Module load/unload functions */
 358 +
 359 +static int __init
 360 +vc_mem_init(void)
 361 +{
 362 +       int rc = -EFAULT;
 363 +       struct device *dev;
 364 +
 365 +       pr_debug("%s: called\n", __func__);
 366 +
 367 +       mm_vc_mem_phys_addr = phys_addr;
 368 +       mm_vc_mem_size = mem_size;
 369 +       mm_vc_mem_base = mem_base;
 370 +
 371 +       vc_mem_get_size();
 372 +
 373 +       pr_info("vc-mem: phys_addr:0x%08lx mem_base=0x%08x mem_size:0x%08x(%u MiB)\n",
 374 +               mm_vc_mem_phys_addr, mm_vc_mem_base, mm_vc_mem_size,
 375 +               mm_vc_mem_size / (1024 * 1024));
 376 +
 377 +       rc = alloc_chrdev_region(&vc_mem_devnum, 0, 1, DRIVER_NAME);
 378 +       if (rc < 0) {
 379 +               pr_err("%s: alloc_chrdev_region failed (rc=%d)\n",
 380 +                      __func__, rc);
 381 +               goto out_err;
 382 +       }
 383 +
 384 +       cdev_init(&vc_mem_cdev, &vc_mem_fops);
 385 +       rc = cdev_add(&vc_mem_cdev, vc_mem_devnum, 1);
 386 +       if (rc) {
 387 +               pr_err("%s: cdev_add failed (rc=%d)\n", __func__, rc);
 388 +               goto out_unregister;
 389 +       }
 390 +
 391 +       vc_mem_class = class_create(THIS_MODULE, DRIVER_NAME);
 392 +       if (IS_ERR(vc_mem_class)) {
 393 +               rc = PTR_ERR(vc_mem_class);
 394 +               pr_err("%s: class_create failed (rc=%d)\n", __func__, rc);
 395 +               goto out_cdev_del;
 396 +       }
 397 +
 398 +       dev = device_create(vc_mem_class, NULL, vc_mem_devnum, NULL,
 399 +                           DRIVER_NAME);
 400 +       if (IS_ERR(dev)) {
 401 +               rc = PTR_ERR(dev);
 402 +               pr_err("%s: device_create failed (rc=%d)\n", __func__, rc);
 403 +               goto out_class_destroy;
 404 +       }
 405 +
 406 +#ifdef CONFIG_DEBUG_FS
 407 +       /* don't fail if the debug entries cannot be created */
 408 +       vc_mem_debugfs_init(dev);
 409 +#endif
 410 +
 411 +       vc_mem_inited = 1;
 412 +       return 0;
 413 +
 414 +out_class_destroy:
 415 +       class_destroy(vc_mem_class);
 416 +       vc_mem_class = NULL;
 417 +
 418 +out_cdev_del:
 419 +       cdev_del(&vc_mem_cdev);
 420 +
 421 +out_unregister:
 422 +       unregister_chrdev_region(vc_mem_devnum, 1);
 423 +
 424 +out_err:
 425 +       return -1;
 426 +}
 427 +
 428 +static void __exit
 429 +vc_mem_exit(void)
 430 +{
 431 +       pr_debug("%s: called\n", __func__);
 432 +
 433 +       if (vc_mem_inited) {
 434 +#if CONFIG_DEBUG_FS
 435 +               vc_mem_debugfs_deinit();
 436 +#endif
 437 +               device_destroy(vc_mem_class, vc_mem_devnum);
 438 +               class_destroy(vc_mem_class);
 439 +               cdev_del(&vc_mem_cdev);
 440 +               unregister_chrdev_region(vc_mem_devnum, 1);
 441 +       }
 442 +}
 443 +
 444 +module_init(vc_mem_init);
 445 +module_exit(vc_mem_exit);
 446 +MODULE_LICENSE("GPL");
 447 +MODULE_AUTHOR("Broadcom Corporation");
 448 +
 449 +module_param(phys_addr, uint, 0644);
 450 +module_param(mem_size, uint, 0644);
 451 +module_param(mem_base, uint, 0644);
 452 --- /dev/null
 453 +++ b/include/linux/broadcom/vc_mem.h
 454 @@ -0,0 +1,39 @@
 455 +/*
 456 + * Copyright 2010 - 2011 Broadcom Corporation.  All rights reserved.
 457 + *
 458 + * Unless you and Broadcom execute a separate written software license
 459 + * agreement governing use of this software, this software is licensed to you
 460 + * under the terms of the GNU General Public License version 2, available at
 461 + * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
 462 + *
 463 + * Notwithstanding the above, under no circumstances may you combine this
 464 + * software in any way with any other Broadcom software provided under a
 465 + * license other than the GPL, without Broadcom's express prior written
 466 + * consent.
 467 + */
 468 +
 469 +#ifndef _VC_MEM_H
 470 +#define _VC_MEM_H
 471 +
 472 +#include <linux/ioctl.h>
 473 +
 474 +#define VC_MEM_IOC_MAGIC  'v'
 475 +
 476 +#define VC_MEM_IOC_MEM_PHYS_ADDR    _IOR(VC_MEM_IOC_MAGIC, 0, unsigned long)
 477 +#define VC_MEM_IOC_MEM_SIZE         _IOR(VC_MEM_IOC_MAGIC, 1, unsigned int)
 478 +#define VC_MEM_IOC_MEM_BASE         _IOR(VC_MEM_IOC_MAGIC, 2, unsigned int)
 479 +#define VC_MEM_IOC_MEM_LOAD         _IOR(VC_MEM_IOC_MAGIC, 3, unsigned int)
 480 +
 481 +#ifdef __KERNEL__
 482 +#define VC_MEM_TO_ARM_ADDR_MASK 0x3FFFFFFF
 483 +
 484 +extern unsigned long mm_vc_mem_phys_addr;
 485 +extern unsigned int  mm_vc_mem_size;
 486 +extern int vc_mem_get_current_size(void);
 487 +#endif
 488 +
 489 +#ifdef CONFIG_COMPAT
 490 +#define VC_MEM_IOC_MEM_PHYS_ADDR32  _IOR(VC_MEM_IOC_MAGIC, 0, compat_ulong_t)
 491 +#endif
 492 +
 493 +#endif  /* _VC_MEM_H */