target/linux/brcm2708/patches-3.10/0041-Add-Simon-Hall-s-dma-helper-module-useful-in-future-.patch

   1 From ed83da894caf28e267eab3a01ef037a7198391a1 Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Mon, 19 Nov 2012 18:27:05 +0000
   4 Subject: [PATCH 041/196] Add Simon Hall's dma helper module, useful in future
   5  for X acceleration
   6
   7 ---
   8  arch/arm/mach-bcm2708/Kconfig                   |   8 +
   9  arch/arm/mach-bcm2708/Makefile                  |   3 +
  10  arch/arm/mach-bcm2708/dmaer.c                   | 887 ++++++++++++++++++++++++
  11  arch/arm/mach-bcm2708/include/mach/vc_support.h |  69 ++
  12  arch/arm/mach-bcm2708/vc_support.c              | 319 +++++++++
  13  5 files changed, 1286 insertions(+)
  14  create mode 100755 arch/arm/mach-bcm2708/dmaer.c
  15  create mode 100755 arch/arm/mach-bcm2708/include/mach/vc_support.h
  16  create mode 100755 arch/arm/mach-bcm2708/vc_support.c
  17
  18 diff --git a/arch/arm/mach-bcm2708/Kconfig b/arch/arm/mach-bcm2708/Kconfig
  19 index a35ff89..b85bb8d 100644
  20 --- a/arch/arm/mach-bcm2708/Kconfig
  21 +++ b/arch/arm/mach-bcm2708/Kconfig
  22 @@ -38,4 +38,12 @@ config BCM2708_SPIDEV
  23          default y
  24          help
  25            Binds spidev driver to the SPI0 master
  26 +
  27 +config BCM2708_DMAER
  28 +       tristate "BCM2708 DMA helper"
  29 +       depends on MACH_BCM2708
  30 +        default n
  31 +        help
  32 +          Enable DMA helper for accelerating X composition
  33 +
  34  endmenu
  35 diff --git a/arch/arm/mach-bcm2708/Makefile b/arch/arm/mach-bcm2708/Makefile
  36 index 164ecb2..0da162c 100644
  37 --- a/arch/arm/mach-bcm2708/Makefile
  38 +++ b/arch/arm/mach-bcm2708/Makefile
  39 @@ -6,3 +6,6 @@ obj-$(CONFIG_MACH_BCM2708)      += clock.o bcm2708.o armctrl.o vcio.o power.o dma.o
  40  obj-$(CONFIG_BCM2708_GPIO)     += bcm2708_gpio.o
  41  obj-$(CONFIG_BCM2708_VCMEM)    += vc_mem.o
  42
  43 +obj-$(CONFIG_BCM2708_DMAER)    += dmaer_master.o
  44 +dmaer_master-objs              := dmaer.o vc_support.o
  45 +
  46 diff --git a/arch/arm/mach-bcm2708/dmaer.c b/arch/arm/mach-bcm2708/dmaer.c
  47 new file mode 100755
  48 index 0000000..d1bc0fa
  49 --- /dev/null
  50 +++ b/arch/arm/mach-bcm2708/dmaer.c
  51 @@ -0,0 +1,887 @@
  52 +#include <linux/init.h>
  53 +#include <linux/sched.h>
  54 +#include <linux/module.h>
  55 +#include <linux/types.h>
  56 +#include <linux/kdev_t.h>
  57 +#include <linux/fs.h>
  58 +#include <linux/cdev.h>
  59 +#include <linux/mm.h>
  60 +#include <linux/slab.h>
  61 +#include <linux/pagemap.h>
  62 +#include <linux/device.h>
  63 +#include <linux/jiffies.h>
  64 +#include <linux/timex.h>
  65 +#include <linux/dma-mapping.h>
  66 +
  67 +#include <asm/uaccess.h>
  68 +#include <asm/atomic.h>
  69 +#include <asm/cacheflush.h>
  70 +#include <asm/io.h>
  71 +
  72 +#include <mach/dma.h>
  73 +#include <mach/vc_support.h>
  74 +
  75 +#ifdef ECLIPSE_IGNORE
  76 +
  77 +#define __user
  78 +#define __init
  79 +#define __exit
  80 +#define __iomem
  81 +#define KERN_DEBUG
  82 +#define KERN_ERR
  83 +#define KERN_WARNING
  84 +#define KERN_INFO
  85 +#define _IOWR(a, b, c) b
  86 +#define _IOW(a, b, c) b
  87 +#define _IO(a, b) b
  88 +
  89 +#endif
  90 +
  91 +//#define inline
  92 +
  93 +#define PRINTK(args...) printk(args)
  94 +//#define PRINTK_VERBOSE(args...) printk(args)
  95 +//#define PRINTK(args...)
  96 +#define PRINTK_VERBOSE(args...)
  97 +
  98 +/***** TYPES ****/
  99 +#define PAGES_PER_LIST 500
 100 +struct PageList
 101 +{
 102 +       struct page *m_pPages[PAGES_PER_LIST];
 103 +       unsigned int m_used;
 104 +       struct PageList *m_pNext;
 105 +};
 106 +
 107 +struct VmaPageList
 108 +{
 109 +       //each vma has a linked list of pages associated with it
 110 +       struct PageList *m_pPageHead;
 111 +       struct PageList *m_pPageTail;
 112 +       unsigned int m_refCount;
 113 +};
 114 +
 115 +struct DmaControlBlock
 116 +{
 117 +       unsigned int m_transferInfo;
 118 +       void __user *m_pSourceAddr;
 119 +       void __user *m_pDestAddr;
 120 +       unsigned int m_xferLen;
 121 +       unsigned int m_tdStride;
 122 +       struct DmaControlBlock *m_pNext;
 123 +       unsigned int m_blank1, m_blank2;
 124 +};
 125 +
 126 +/***** DEFINES ******/
 127 +//magic number defining the module
 128 +#define DMA_MAGIC              0xdd
 129 +
 130 +//do user virtual to physical translation of the CB chain
 131 +#define DMA_PREPARE            _IOWR(DMA_MAGIC, 0, struct DmaControlBlock *)
 132 +
 133 +//kick the pre-prepared CB chain
 134 +#define DMA_KICK               _IOW(DMA_MAGIC, 1, struct DmaControlBlock *)
 135 +
 136 +//prepare it, kick it, wait for it
 137 +#define DMA_PREPARE_KICK_WAIT  _IOWR(DMA_MAGIC, 2, struct DmaControlBlock *)
 138 +
 139 +//prepare it, kick it, don't wait for it
 140 +#define DMA_PREPARE_KICK       _IOWR(DMA_MAGIC, 3, struct DmaControlBlock *)
 141 +
 142 +//not currently implemented
 143 +#define DMA_WAIT_ONE           _IO(DMA_MAGIC, 4, struct DmaControlBlock *)
 144 +
 145 +//wait on all kicked CB chains
 146 +#define DMA_WAIT_ALL           _IO(DMA_MAGIC, 5)
 147 +
 148 +//in order to discover the largest AXI burst that should be programmed into the transfer params
 149 +#define DMA_MAX_BURST          _IO(DMA_MAGIC, 6)
 150 +
 151 +//set the address range through which the user address is assumed to already by a physical address
 152 +#define DMA_SET_MIN_PHYS       _IOW(DMA_MAGIC, 7, unsigned long)
 153 +#define DMA_SET_MAX_PHYS       _IOW(DMA_MAGIC, 8, unsigned long)
 154 +#define DMA_SET_PHYS_OFFSET    _IOW(DMA_MAGIC, 9, unsigned long)
 155 +
 156 +//used to define the size for the CMA-based allocation *in pages*, can only be done once once the file is opened
 157 +#define DMA_CMA_SET_SIZE       _IOW(DMA_MAGIC, 10, unsigned long)
 158 +
 159 +//used to get the version of the module, to test for a capability
 160 +#define DMA_GET_VERSION                _IO(DMA_MAGIC, 99)
 161 +
 162 +#define VERSION_NUMBER 1
 163 +
 164 +#define VIRT_TO_BUS_CACHE_SIZE 8
 165 +
 166 +/***** FILE OPS *****/
 167 +static int Open(struct inode *pInode, struct file *pFile);
 168 +static int Release(struct inode *pInode, struct file *pFile);
 169 +static long Ioctl(struct file *pFile, unsigned int cmd, unsigned long arg);
 170 +static ssize_t Read(struct file *pFile, char __user *pUser, size_t count, loff_t *offp);
 171 +static int Mmap(struct file *pFile, struct vm_area_struct *pVma);
 172 +
 173 +/***** VMA OPS ****/
 174 +static void VmaOpen4k(struct vm_area_struct *pVma);
 175 +static void VmaClose4k(struct vm_area_struct *pVma);
 176 +static int VmaFault4k(struct vm_area_struct *pVma, struct vm_fault *pVmf);
 177 +
 178 +/**** DMA PROTOTYPES */
 179 +static struct DmaControlBlock __user *DmaPrepare(struct DmaControlBlock __user *pUserCB, int *pError);
 180 +static int DmaKick(struct DmaControlBlock __user *pUserCB);
 181 +static void DmaWaitAll(void);
 182 +
 183 +/**** GENERIC ****/
 184 +static int __init dmaer_init(void);
 185 +static void __exit dmaer_exit(void);
 186 +
 187 +/*** OPS ***/
 188 +static struct vm_operations_struct g_vmOps4k = {
 189 +       .open = VmaOpen4k,
 190 +       .close = VmaClose4k,
 191 +       .fault = VmaFault4k,
 192 +};
 193 +
 194 +static struct file_operations g_fOps = {
 195 +       .owner = THIS_MODULE,
 196 +       .llseek = 0,
 197 +       .read = Read,
 198 +       .write = 0,
 199 +       .unlocked_ioctl = Ioctl,
 200 +       .open = Open,
 201 +       .release = Release,
 202 +       .mmap = Mmap,
 203 +};
 204 +
 205 +/***** GLOBALS ******/
 206 +static dev_t g_majorMinor;
 207 +
 208 +//tracking usage of the two files
 209 +static atomic_t g_oneLock4k = ATOMIC_INIT(1);
 210 +
 211 +//device operations
 212 +static struct cdev g_cDev;
 213 +static int g_trackedPages = 0;
 214 +
 215 +//dma control
 216 +static unsigned int *g_pDmaChanBase;
 217 +static int g_dmaIrq;
 218 +static int g_dmaChan;
 219 +
 220 +//cma allocation
 221 +static int g_cmaHandle;
 222 +
 223 +//user virtual to bus address translation acceleration
 224 +static unsigned long g_virtAddr[VIRT_TO_BUS_CACHE_SIZE];
 225 +static unsigned long g_busAddr[VIRT_TO_BUS_CACHE_SIZE];
 226 +static unsigned long g_cbVirtAddr;
 227 +static unsigned long g_cbBusAddr;
 228 +static int g_cacheInsertAt;
 229 +static int g_cacheHit, g_cacheMiss;
 230 +
 231 +//off by default
 232 +static void __user *g_pMinPhys;
 233 +static void __user *g_pMaxPhys;
 234 +static unsigned long g_physOffset;
 235 +
 236 +/****** CACHE OPERATIONS ********/
 237 +static inline void FlushAddrCache(void)
 238 +{
 239 +       int count = 0;
 240 +       for (count = 0; count < VIRT_TO_BUS_CACHE_SIZE; count++)
 241 +               g_virtAddr[count] = 0xffffffff;                 //never going to match as we always chop the bottom bits anyway
 242 +
 243 +       g_cbVirtAddr = 0xffffffff;
 244 +
 245 +       g_cacheInsertAt = 0;
 246 +}
 247 +
 248 +//translate from a user virtual address to a bus address by mapping the page
 249 +//NB this won't lock a page in memory, so to avoid potential paging issues using kernel logical addresses
 250 +static inline void __iomem *UserVirtualToBus(void __user *pUser)
 251 +{
 252 +       int mapped;
 253 +       struct page *pPage;
 254 +       void *phys;
 255 +
 256 +       //map it (requiring that the pointer points to something that does not hang off the page boundary)
 257 +       mapped = get_user_pages(current, current->mm,
 258 +               (unsigned long)pUser, 1,
 259 +               1, 0,
 260 +               &pPage,
 261 +               0);
 262 +
 263 +       if (mapped <= 0)                //error
 264 +               return 0;
 265 +
 266 +       PRINTK_VERBOSE(KERN_DEBUG "user virtual %p arm phys %p bus %p\n",
 267 +                       pUser, page_address(pPage), (void __iomem *)__virt_to_bus(page_address(pPage)));
 268 +
 269 +       //get the arm physical address
 270 +       phys = page_address(pPage) + offset_in_page(pUser);
 271 +       page_cache_release(pPage);
 272 +
 273 +       //and now the bus address
 274 +       return (void __iomem *)__virt_to_bus(phys);
 275 +}
 276 +
 277 +static inline void __iomem *UserVirtualToBusViaCbCache(void __user *pUser)
 278 +{
 279 +       unsigned long virtual_page = (unsigned long)pUser & ~4095;
 280 +       unsigned long page_offset = (unsigned long)pUser & 4095;
 281 +       unsigned long bus_addr;
 282 +
 283 +       if (g_cbVirtAddr == virtual_page)
 284 +       {
 285 +               bus_addr = g_cbBusAddr + page_offset;
 286 +               g_cacheHit++;
 287 +               return (void __iomem *)bus_addr;
 288 +       }
 289 +       else
 290 +       {
 291 +               bus_addr = (unsigned long)UserVirtualToBus(pUser);
 292 +
 293 +               if (!bus_addr)
 294 +                       return 0;
 295 +
 296 +               g_cbVirtAddr = virtual_page;
 297 +               g_cbBusAddr = bus_addr & ~4095;
 298 +               g_cacheMiss++;
 299 +
 300 +               return (void __iomem *)bus_addr;
 301 +       }
 302 +}
 303 +
 304 +//do the same as above, by query our virt->bus cache
 305 +static inline void __iomem *UserVirtualToBusViaCache(void __user *pUser)
 306 +{
 307 +       int count;
 308 +       //get the page and its offset
 309 +       unsigned long virtual_page = (unsigned long)pUser & ~4095;
 310 +       unsigned long page_offset = (unsigned long)pUser & 4095;
 311 +       unsigned long bus_addr;
 312 +
 313 +       if (pUser >= g_pMinPhys && pUser < g_pMaxPhys)
 314 +       {
 315 +               PRINTK_VERBOSE(KERN_DEBUG "user->phys passthrough on %p\n", pUser);
 316 +               return (void __iomem *)((unsigned long)pUser + g_physOffset);
 317 +       }
 318 +
 319 +       //check the cache for our entry
 320 +       for (count = 0; count < VIRT_TO_BUS_CACHE_SIZE; count++)
 321 +               if (g_virtAddr[count] == virtual_page)
 322 +               {
 323 +                       bus_addr = g_busAddr[count] + page_offset;
 324 +                       g_cacheHit++;
 325 +                       return (void __iomem *)bus_addr;
 326 +               }
 327 +
 328 +       //not found, look up manually and then insert its page address
 329 +       bus_addr = (unsigned long)UserVirtualToBus(pUser);
 330 +
 331 +       if (!bus_addr)
 332 +               return 0;
 333 +
 334 +       g_virtAddr[g_cacheInsertAt] = virtual_page;
 335 +       g_busAddr[g_cacheInsertAt] = bus_addr & ~4095;
 336 +
 337 +       //round robin
 338 +       g_cacheInsertAt++;
 339 +       if (g_cacheInsertAt == VIRT_TO_BUS_CACHE_SIZE)
 340 +               g_cacheInsertAt = 0;
 341 +
 342 +       g_cacheMiss++;
 343 +
 344 +       return (void __iomem *)bus_addr;
 345 +}
 346 +
 347 +/***** FILE OPERATIONS ****/
 348 +static int Open(struct inode *pInode, struct file *pFile)
 349 +{
 350 +       PRINTK(KERN_DEBUG "file opening: %d/%d\n", imajor(pInode), iminor(pInode));
 351 +
 352 +       //check which device we are
 353 +       if (iminor(pInode) == 0)                //4k
 354 +       {
 355 +               //only one at a time
 356 +               if (!atomic_dec_and_test(&g_oneLock4k))
 357 +               {
 358 +                       atomic_inc(&g_oneLock4k);
 359 +                       return -EBUSY;
 360 +               }
 361 +       }
 362 +       else
 363 +               return -EINVAL;
 364 +
 365 +       //todo there will be trouble if two different processes open the files
 366 +
 367 +       //reset after any file is opened
 368 +       g_pMinPhys = (void __user *)-1;
 369 +       g_pMaxPhys = (void __user *)0;
 370 +       g_physOffset = 0;
 371 +       g_cmaHandle = 0;
 372 +
 373 +       return 0;
 374 +}
 375 +
 376 +static int Release(struct inode *pInode, struct file *pFile)
 377 +{
 378 +       PRINTK(KERN_DEBUG "file closing, %d pages tracked\n", g_trackedPages);
 379 +       if (g_trackedPages)
 380 +               PRINTK(KERN_ERR "we\'re leaking memory!\n");
 381 +
 382 +       //wait for any dmas to finish
 383 +       DmaWaitAll();
 384 +
 385 +       //free this memory on the application closing the file or it crashing (implicitly closing the file)
 386 +       if (g_cmaHandle)
 387 +       {
 388 +               PRINTK(KERN_DEBUG "unlocking vc memory\n");
 389 +               if (UnlockVcMemory(g_cmaHandle))
 390 +                       PRINTK(KERN_ERR "uh-oh, unable to unlock vc memory!\n");
 391 +               PRINTK(KERN_DEBUG "releasing vc memory\n");
 392 +               if (ReleaseVcMemory(g_cmaHandle))
 393 +                       PRINTK(KERN_ERR "uh-oh, unable to release vc memory!\n");
 394 +       }
 395 +
 396 +       if (iminor(pInode) == 0)
 397 +               atomic_inc(&g_oneLock4k);
 398 +       else
 399 +               return -EINVAL;
 400 +
 401 +       return 0;
 402 +}
 403 +
 404 +static struct DmaControlBlock __user *DmaPrepare(struct DmaControlBlock __user *pUserCB, int *pError)
 405 +{
 406 +       struct DmaControlBlock kernCB;
 407 +       struct DmaControlBlock __user *pUNext;
 408 +       void __iomem *pSourceBus, __iomem *pDestBus;
 409 +
 410 +       //get the control block into kernel memory so we can work on it
 411 +       if (copy_from_user(&kernCB, pUserCB, sizeof(struct DmaControlBlock)) != 0)
 412 +       {
 413 +               PRINTK(KERN_ERR "copy_from_user failed for user cb %p\n", pUserCB);
 414 +               *pError = 1;
 415 +               return 0;
 416 +       }
 417 +
 418 +       if (kernCB.m_pSourceAddr == 0 || kernCB.m_pDestAddr == 0)
 419 +       {
 420 +               PRINTK(KERN_ERR "faulty source (%p) dest (%p) addresses for user cb %p\n",
 421 +                       kernCB.m_pSourceAddr, kernCB.m_pDestAddr, pUserCB);
 422 +               *pError = 1;
 423 +               return 0;
 424 +       }
 425 +
 426 +       pSourceBus = UserVirtualToBusViaCache(kernCB.m_pSourceAddr);
 427 +       pDestBus = UserVirtualToBusViaCache(kernCB.m_pDestAddr);
 428 +
 429 +       if (!pSourceBus || !pDestBus)
 430 +       {
 431 +               PRINTK(KERN_ERR "virtual to bus translation failure for source/dest %p/%p->%p/%p\n",
 432 +                               kernCB.m_pSourceAddr, kernCB.m_pDestAddr,
 433 +                               pSourceBus, pDestBus);
 434 +               *pError = 1;
 435 +               return 0;
 436 +       }
 437 +
 438 +       //update the user structure with the new bus addresses
 439 +       kernCB.m_pSourceAddr = pSourceBus;
 440 +       kernCB.m_pDestAddr = pDestBus;
 441 +
 442 +       PRINTK_VERBOSE(KERN_DEBUG "final source %p dest %p\n", kernCB.m_pSourceAddr, kernCB.m_pDestAddr);
 443 +
 444 +       //sort out the bus address for the next block
 445 +       pUNext = kernCB.m_pNext;
 446 +
 447 +       if (kernCB.m_pNext)
 448 +       {
 449 +               void __iomem *pNextBus;
 450 +               pNextBus = UserVirtualToBusViaCbCache(kernCB.m_pNext);
 451 +
 452 +               if (!pNextBus)
 453 +               {
 454 +                       PRINTK(KERN_ERR "virtual to bus translation failure for m_pNext\n");
 455 +                       *pError = 1;
 456 +                       return 0;
 457 +               }
 458 +
 459 +               //update the pointer with the bus address
 460 +               kernCB.m_pNext = pNextBus;
 461 +       }
 462 +
 463 +       //write it back to user space
 464 +       if (copy_to_user(pUserCB, &kernCB, sizeof(struct DmaControlBlock)) != 0)
 465 +       {
 466 +               PRINTK(KERN_ERR "copy_to_user failed for cb %p\n", pUserCB);
 467 +               *pError = 1;
 468 +               return 0;
 469 +       }
 470 +
 471 +       __cpuc_flush_dcache_area(pUserCB, 32);
 472 +
 473 +       *pError = 0;
 474 +       return pUNext;
 475 +}
 476 +
 477 +static int DmaKick(struct DmaControlBlock __user *pUserCB)
 478 +{
 479 +       void __iomem *pBusCB;
 480 +
 481 +       pBusCB = UserVirtualToBusViaCbCache(pUserCB);
 482 +       if (!pBusCB)
 483 +       {
 484 +               PRINTK(KERN_ERR "virtual to bus translation failure for cb\n");
 485 +               return 1;
 486 +       }
 487 +
 488 +       //flush_cache_all();
 489 +
 490 +       bcm_dma_start(g_pDmaChanBase, (dma_addr_t)pBusCB);
 491 +
 492 +       return 0;
 493 +}
 494 +
 495 +static void DmaWaitAll(void)
 496 +{
 497 +       int counter = 0;
 498 +       volatile int inner_count;
 499 +       volatile unsigned int cs;
 500 +       unsigned long time_before, time_after;
 501 +
 502 +       time_before = jiffies;
 503 +       //bcm_dma_wait_idle(g_pDmaChanBase);
 504 +       dsb();
 505 +
 506 +       cs = readl(g_pDmaChanBase);
 507 +
 508 +       while ((cs & 1) == 1)
 509 +       {
 510 +               cs = readl(g_pDmaChanBase);
 511 +               counter++;
 512 +
 513 +               for (inner_count = 0; inner_count < 32; inner_count++);
 514 +
 515 +               asm volatile ("MCR p15,0,r0,c7,c0,4 \n");
 516 +               //cpu_do_idle();
 517 +               if (counter >= 1000000)
 518 +               {
 519 +                       PRINTK(KERN_WARNING "DMA failed to finish in a timely fashion\n");
 520 +                       break;
 521 +               }
 522 +       }
 523 +       time_after = jiffies;
 524 +       PRINTK_VERBOSE(KERN_DEBUG "done, counter %d, cs %08x", counter, cs);
 525 +       PRINTK_VERBOSE(KERN_DEBUG "took %ld jiffies, %d HZ\n", time_after - time_before, HZ);
 526 +}
 527 +
 528 +static long Ioctl(struct file *pFile, unsigned int cmd, unsigned long arg)
 529 +{
 530 +       int error = 0;
 531 +       PRINTK_VERBOSE(KERN_DEBUG "ioctl cmd %x arg %lx\n", cmd, arg);
 532 +
 533 +       switch (cmd)
 534 +       {
 535 +       case DMA_PREPARE:
 536 +       case DMA_PREPARE_KICK:
 537 +       case DMA_PREPARE_KICK_WAIT:
 538 +               {
 539 +                       struct DmaControlBlock __user *pUCB = (struct DmaControlBlock *)arg;
 540 +                       int steps = 0;
 541 +                       unsigned long start_time = jiffies;
 542 +                       (void)start_time;
 543 +
 544 +                       //flush our address cache
 545 +                       FlushAddrCache();
 546 +
 547 +                       PRINTK_VERBOSE(KERN_DEBUG "dma prepare\n");
 548 +
 549 +                       //do virtual to bus translation for each entry
 550 +                       do
 551 +                       {
 552 +                               pUCB = DmaPrepare(pUCB, &error);
 553 +                       } while (error == 0 && ++steps && pUCB);
 554 +                       PRINTK_VERBOSE(KERN_DEBUG "prepare done in %d steps, %ld\n", steps, jiffies - start_time);
 555 +
 556 +                       //carry straight on if we want to kick too
 557 +                       if (cmd == DMA_PREPARE || error)
 558 +                       {
 559 +                               PRINTK_VERBOSE(KERN_DEBUG "falling out\n");
 560 +                               return error ? -EINVAL : 0;
 561 +                       }
 562 +               }
 563 +       case DMA_KICK:
 564 +               PRINTK_VERBOSE(KERN_DEBUG "dma begin\n");
 565 +
 566 +               if (cmd == DMA_KICK)
 567 +                       FlushAddrCache();
 568 +
 569 +               DmaKick((struct DmaControlBlock __user *)arg);
 570 +
 571 +               if (cmd != DMA_PREPARE_KICK_WAIT)
 572 +                       break;
 573 +/*     case DMA_WAIT_ONE:
 574 +               //PRINTK(KERN_DEBUG "dma wait one\n");
 575 +               break;*/
 576 +       case DMA_WAIT_ALL:
 577 +               //PRINTK(KERN_DEBUG "dma wait all\n");
 578 +               DmaWaitAll();
 579 +               break;
 580 +       case DMA_MAX_BURST:
 581 +               if (g_dmaChan == 0)
 582 +                       return 10;
 583 +               else
 584 +                       return 5;
 585 +       case DMA_SET_MIN_PHYS:
 586 +               g_pMinPhys = (void __user *)arg;
 587 +               PRINTK(KERN_DEBUG "min/max user/phys bypass set to %p %p\n", g_pMinPhys, g_pMaxPhys);
 588 +               break;
 589 +       case DMA_SET_MAX_PHYS:
 590 +               g_pMaxPhys = (void __user *)arg;
 591 +               PRINTK(KERN_DEBUG "min/max user/phys bypass set to %p %p\n", g_pMinPhys, g_pMaxPhys);
 592 +               break;
 593 +       case DMA_SET_PHYS_OFFSET:
 594 +               g_physOffset = arg;
 595 +               PRINTK(KERN_DEBUG "user/phys bypass offset set to %ld\n", g_physOffset);
 596 +               break;
 597 +       case DMA_CMA_SET_SIZE:
 598 +       {
 599 +               unsigned int pBusAddr;
 600 +
 601 +               if (g_cmaHandle)
 602 +               {
 603 +                       PRINTK(KERN_ERR "memory has already been allocated (handle %d)\n", g_cmaHandle);
 604 +                       return -EINVAL;
 605 +               }
 606 +
 607 +               PRINTK(KERN_INFO "allocating %ld bytes of VC memory\n", arg * 4096);
 608 +
 609 +               //get the memory
 610 +               if (AllocateVcMemory(&g_cmaHandle, arg * 4096, 4096, MEM_FLAG_L1_NONALLOCATING | MEM_FLAG_NO_INIT | MEM_FLAG_HINT_PERMALOCK))
 611 +               {
 612 +                       PRINTK(KERN_ERR "failed to allocate %ld bytes of VC memory\n", arg * 4096);
 613 +                       g_cmaHandle = 0;
 614 +                       return -EINVAL;
 615 +               }
 616 +
 617 +               //get an address for it
 618 +               PRINTK(KERN_INFO "trying to map VC memory\n");
 619 +
 620 +               if (LockVcMemory(&pBusAddr, g_cmaHandle))
 621 +               {
 622 +                       PRINTK(KERN_ERR "failed to map CMA handle %d, releasing memory\n", g_cmaHandle);
 623 +                       ReleaseVcMemory(g_cmaHandle);
 624 +                       g_cmaHandle = 0;
 625 +               }
 626 +
 627 +               PRINTK(KERN_INFO "bus address for CMA memory is %x\n", pBusAddr);
 628 +               return pBusAddr;
 629 +       }
 630 +       case DMA_GET_VERSION:
 631 +               PRINTK(KERN_DEBUG "returning version number, %d\n", VERSION_NUMBER);
 632 +               return VERSION_NUMBER;
 633 +       default:
 634 +               PRINTK(KERN_DEBUG "unknown ioctl: %d\n", cmd);
 635 +               return -EINVAL;
 636 +       }
 637 +
 638 +       return 0;
 639 +}
 640 +
 641 +static ssize_t Read(struct file *pFile, char __user *pUser, size_t count, loff_t *offp)
 642 +{
 643 +       return -EIO;
 644 +}
 645 +
 646 +static int Mmap(struct file *pFile, struct vm_area_struct *pVma)
 647 +{
 648 +       struct PageList *pPages;
 649 +       struct VmaPageList *pVmaList;
 650 +
 651 +       PRINTK_VERBOSE(KERN_DEBUG "MMAP vma %p, length %ld (%s %d)\n",
 652 +               pVma, pVma->vm_end - pVma->vm_start,
 653 +               current->comm, current->pid);
 654 +       PRINTK_VERBOSE(KERN_DEBUG "MMAP %p %d (tracked %d)\n", pVma, current->pid, g_trackedPages);
 655 +
 656 +       //make a new page list
 657 +       pPages = (struct PageList *)kmalloc(sizeof(struct PageList), GFP_KERNEL);
 658 +       if (!pPages)
 659 +       {
 660 +               PRINTK(KERN_ERR "couldn\'t allocate a new page list (%s %d)\n",
 661 +                       current->comm, current->pid);
 662 +               return -ENOMEM;
 663 +       }
 664 +
 665 +       //clear the page list
 666 +       pPages->m_used = 0;
 667 +       pPages->m_pNext = 0;
 668 +
 669 +       //insert our vma and new page list somewhere
 670 +       if (!pVma->vm_private_data)
 671 +       {
 672 +               struct VmaPageList *pList;
 673 +
 674 +               PRINTK_VERBOSE(KERN_DEBUG "new vma list, making new one (%s %d)\n",
 675 +                       current->comm, current->pid);
 676 +
 677 +               //make a new vma list
 678 +               pList = (struct VmaPageList *)kmalloc(sizeof(struct VmaPageList), GFP_KERNEL);
 679 +               if (!pList)
 680 +               {
 681 +                       PRINTK(KERN_ERR "couldn\'t allocate vma page list (%s %d)\n",
 682 +                               current->comm, current->pid);
 683 +                       kfree(pPages);
 684 +                       return -ENOMEM;
 685 +               }
 686 +
 687 +               //clear this list
 688 +               pVma->vm_private_data = (void *)pList;
 689 +               pList->m_refCount = 0;
 690 +       }
 691 +
 692 +       pVmaList = (struct VmaPageList *)pVma->vm_private_data;
 693 +
 694 +       //add it to the vma list
 695 +       pVmaList->m_pPageHead = pPages;
 696 +       pVmaList->m_pPageTail = pPages;
 697 +
 698 +       pVma->vm_ops = &g_vmOps4k;
 699 +       pVma->vm_flags |= VM_IO;
 700 +
 701 +       VmaOpen4k(pVma);
 702 +
 703 +       return 0;
 704 +}
 705 +
 706 +/****** VMA OPERATIONS ******/
 707 +
 708 +static void VmaOpen4k(struct vm_area_struct *pVma)
 709 +{
 710 +       struct VmaPageList *pVmaList;
 711 +
 712 +       PRINTK_VERBOSE(KERN_DEBUG "vma open %p private %p (%s %d), %d live pages\n", pVma, pVma->vm_private_data, current->comm, current->pid, g_trackedPages);
 713 +       PRINTK_VERBOSE(KERN_DEBUG "OPEN %p %d %ld pages (tracked pages %d)\n",
 714 +               pVma, current->pid, (pVma->vm_end - pVma->vm_start) >> 12,
 715 +               g_trackedPages);
 716 +
 717 +       pVmaList = (struct VmaPageList *)pVma->vm_private_data;
 718 +
 719 +       if (pVmaList)
 720 +       {
 721 +               pVmaList->m_refCount++;
 722 +               PRINTK_VERBOSE(KERN_DEBUG "ref count is now %d\n", pVmaList->m_refCount);
 723 +       }
 724 +       else
 725 +       {
 726 +               PRINTK_VERBOSE(KERN_DEBUG "err, open but no vma page list\n");
 727 +       }
 728 +}
 729 +
 730 +static void VmaClose4k(struct vm_area_struct *pVma)
 731 +{
 732 +       struct VmaPageList *pVmaList;
 733 +       int freed = 0;
 734 +
 735 +       PRINTK_VERBOSE(KERN_DEBUG "vma close %p private %p (%s %d)\n", pVma, pVma->vm_private_data, current->comm, current->pid);
 736 +
 737 +       //wait for any dmas to finish
 738 +       DmaWaitAll();
 739 +
 740 +       //find our vma in the list
 741 +       pVmaList = (struct VmaPageList *)pVma->vm_private_data;
 742 +
 743 +       //may be a fork
 744 +       if (pVmaList)
 745 +       {
 746 +               struct PageList *pPages;
 747 +
 748 +               pVmaList->m_refCount--;
 749 +
 750 +               if (pVmaList->m_refCount == 0)
 751 +               {
 752 +                       PRINTK_VERBOSE(KERN_DEBUG "found vma, freeing pages (%s %d)\n",
 753 +                               current->comm, current->pid);
 754 +
 755 +                       pPages = pVmaList->m_pPageHead;
 756 +
 757 +                       if (!pPages)
 758 +                       {
 759 +                               PRINTK(KERN_ERR "no page list (%s %d)!\n",
 760 +                                       current->comm, current->pid);
 761 +                               return;
 762 +                       }
 763 +
 764 +                       while (pPages)
 765 +                       {
 766 +                               struct PageList *next;
 767 +                               int count;
 768 +
 769 +                               PRINTK_VERBOSE(KERN_DEBUG "page list (%s %d)\n",
 770 +                                       current->comm, current->pid);
 771 +
 772 +                               next = pPages->m_pNext;
 773 +                               for (count = 0; count < pPages->m_used; count++)
 774 +                               {
 775 +                                       PRINTK_VERBOSE(KERN_DEBUG "freeing page %p (%s %d)\n",
 776 +                                               pPages->m_pPages[count],
 777 +                                               current->comm, current->pid);
 778 +                                       __free_pages(pPages->m_pPages[count], 0);
 779 +                                       g_trackedPages--;
 780 +                                       freed++;
 781 +                               }
 782 +
 783 +                               PRINTK_VERBOSE(KERN_DEBUG "freeing page list (%s %d)\n",
 784 +                                       current->comm, current->pid);
 785 +                               kfree(pPages);
 786 +                               pPages = next;
 787 +                       }
 788 +
 789 +                       //remove our vma from the list
 790 +                       kfree(pVmaList);
 791 +                       pVma->vm_private_data = 0;
 792 +               }
 793 +               else
 794 +               {
 795 +                       PRINTK_VERBOSE(KERN_DEBUG "ref count is %d, not closing\n", pVmaList->m_refCount);
 796 +               }
 797 +       }
 798 +       else
 799 +       {
 800 +               PRINTK_VERBOSE(KERN_ERR "uh-oh, vma %p not found (%s %d)!\n", pVma, current->comm, current->pid);
 801 +               PRINTK_VERBOSE(KERN_ERR "CLOSE ERR\n");
 802 +       }
 803 +
 804 +       PRINTK_VERBOSE(KERN_DEBUG "CLOSE %p %d %d pages (tracked pages %d)",
 805 +               pVma, current->pid, freed, g_trackedPages);
 806 +
 807 +       PRINTK_VERBOSE(KERN_DEBUG "%d pages open\n", g_trackedPages);
 808 +}
 809 +
 810 +static int VmaFault4k(struct vm_area_struct *pVma, struct vm_fault *pVmf)
 811 +{
 812 +       PRINTK_VERBOSE(KERN_DEBUG "vma fault for vma %p private %p at offset %ld (%s %d)\n", pVma, pVma->vm_private_data, pVmf->pgoff,
 813 +               current->comm, current->pid);
 814 +       PRINTK_VERBOSE(KERN_DEBUG "FAULT\n");
 815 +       pVmf->page = alloc_page(GFP_KERNEL);
 816 +
 817 +       if (pVmf->page)
 818 +       {
 819 +               PRINTK_VERBOSE(KERN_DEBUG "alloc page virtual %p\n", page_address(pVmf->page));
 820 +       }
 821 +
 822 +       if (!pVmf->page)
 823 +       {
 824 +               PRINTK(KERN_ERR "vma fault oom (%s %d)\n", current->comm, current->pid);
 825 +               return VM_FAULT_OOM;
 826 +       }
 827 +       else
 828 +       {
 829 +               struct VmaPageList *pVmaList;
 830 +
 831 +               get_page(pVmf->page);
 832 +               g_trackedPages++;
 833 +
 834 +               //find our vma in the list
 835 +               pVmaList = (struct VmaPageList *)pVma->vm_private_data;
 836 +
 837 +               if (pVmaList)
 838 +               {
 839 +                       PRINTK_VERBOSE(KERN_DEBUG "vma found (%s %d)\n", current->comm, current->pid);
 840 +
 841 +                       if (pVmaList->m_pPageTail->m_used == PAGES_PER_LIST)
 842 +                       {
 843 +                               PRINTK_VERBOSE(KERN_DEBUG "making new page list (%s %d)\n", current->comm, current->pid);
 844 +                               //making a new page list
 845 +                               pVmaList->m_pPageTail->m_pNext = (struct PageList *)kmalloc(sizeof(struct PageList), GFP_KERNEL);
 846 +                               if (!pVmaList->m_pPageTail->m_pNext)
 847 +                                       return -ENOMEM;
 848 +
 849 +                               //update the tail pointer
 850 +                               pVmaList->m_pPageTail = pVmaList->m_pPageTail->m_pNext;
 851 +                               pVmaList->m_pPageTail->m_used = 0;
 852 +                               pVmaList->m_pPageTail->m_pNext = 0;
 853 +                       }
 854 +
 855 +                       PRINTK_VERBOSE(KERN_DEBUG "adding page to list (%s %d)\n", current->comm, current->pid);
 856 +
 857 +                       pVmaList->m_pPageTail->m_pPages[pVmaList->m_pPageTail->m_used] = pVmf->page;
 858 +                       pVmaList->m_pPageTail->m_used++;
 859 +               }
 860 +               else
 861 +                       PRINTK(KERN_ERR "returned page for vma we don\'t know %p (%s %d)\n", pVma, current->comm, current->pid);
 862 +
 863 +               return 0;
 864 +       }
 865 +}
 866 +
 867 +/****** GENERIC FUNCTIONS ******/
 868 +static int __init dmaer_init(void)
 869 +{
 870 +       int result = alloc_chrdev_region(&g_majorMinor, 0, 1, "dmaer");
 871 +       if (result < 0)
 872 +       {
 873 +               PRINTK(KERN_ERR "unable to get major device number\n");
 874 +               return result;
 875 +       }
 876 +       else
 877 +               PRINTK(KERN_DEBUG "major device number %d\n", MAJOR(g_majorMinor));
 878 +
 879 +       PRINTK(KERN_DEBUG "vma list size %d, page list size %d, page size %ld\n",
 880 +               sizeof(struct VmaPageList), sizeof(struct PageList), PAGE_SIZE);
 881 +
 882 +       //get a dma channel to work with
 883 +       result = bcm_dma_chan_alloc(BCM_DMA_FEATURE_FAST, (void **)&g_pDmaChanBase, &g_dmaIrq);
 884 +
 885 +       //uncomment to force to channel 0
 886 +       //result = 0;
 887 +       //g_pDmaChanBase = 0xce808000;
 888 +
 889 +       if (result < 0)
 890 +       {
 891 +               PRINTK(KERN_ERR "failed to allocate dma channel\n");
 892 +               cdev_del(&g_cDev);
 893 +               unregister_chrdev_region(g_majorMinor, 1);
 894 +       }
 895 +
 896 +       //reset the channel
 897 +       PRINTK(KERN_DEBUG "allocated dma channel %d (%p), initial state %08x\n", result, g_pDmaChanBase, *g_pDmaChanBase);
 898 +       *g_pDmaChanBase = 1 << 31;
 899 +       PRINTK(KERN_DEBUG "post-reset %08x\n", *g_pDmaChanBase);
 900 +
 901 +       g_dmaChan = result;
 902 +
 903 +       //clear the cache stats
 904 +       g_cacheHit = 0;
 905 +       g_cacheMiss = 0;
 906 +
 907 +       //register our device - after this we are go go go
 908 +       cdev_init(&g_cDev, &g_fOps);
 909 +       g_cDev.owner = THIS_MODULE;
 910 +       g_cDev.ops = &g_fOps;
 911 +
 912 +       result = cdev_add(&g_cDev, g_majorMinor, 1);
 913 +       if (result < 0)
 914 +       {
 915 +               PRINTK(KERN_ERR "failed to add character device\n");
 916 +               unregister_chrdev_region(g_majorMinor, 1);
 917 +               bcm_dma_chan_free(g_dmaChan);
 918 +               return result;
 919 +       }
 920 +
 921 +       return 0;
 922 +}
 923 +
 924 +static void __exit dmaer_exit(void)
 925 +{
 926 +       PRINTK(KERN_INFO "closing dmaer device, cache stats: %d hits %d misses\n", g_cacheHit, g_cacheMiss);
 927 +       //unregister the device
 928 +       cdev_del(&g_cDev);
 929 +       unregister_chrdev_region(g_majorMinor, 1);
 930 +       //free the dma channel
 931 +       bcm_dma_chan_free(g_dmaChan);
 932 +}
 933 +
 934 +MODULE_LICENSE("Dual BSD/GPL");
 935 +MODULE_AUTHOR("Simon Hall");
 936 +module_init(dmaer_init);
 937 +module_exit(dmaer_exit);
 938 +
 939 diff --git a/arch/arm/mach-bcm2708/include/mach/vc_support.h b/arch/arm/mach-bcm2708/include/mach/vc_support.h
 940 new file mode 100755
 941 index 0000000..70e809f
 942 --- /dev/null
 943 +++ b/arch/arm/mach-bcm2708/include/mach/vc_support.h
 944 @@ -0,0 +1,69 @@
 945 +#ifndef _VC_SUPPORT_H_
 946 +#define _VC_SUPPORT_H_
 947 +
 948 +/*
 949 + * vc_support.h
 950 + *
 951 + *  Created on: 25 Nov 2012
 952 + *      Author: Simon
 953 + */
 954 +
 955 +enum {
 956 +/*
 957 +      If a MEM_HANDLE_T is discardable, the memory manager may resize it to size
 958 +      0 at any time when it is not locked or retained.
 959 +   */
 960 +   MEM_FLAG_DISCARDABLE = 1 << 0,
 961 +
 962 +   /*
 963 +      If a MEM_HANDLE_T is allocating (or normal), its block of memory will be
 964 +      accessed in an allocating fashion through the cache.
 965 +   */
 966 +   MEM_FLAG_NORMAL = 0 << 2,
 967 +   MEM_FLAG_ALLOCATING = MEM_FLAG_NORMAL,
 968 +
 969 +   /*
 970 +      If a MEM_HANDLE_T is direct, its block of memory will be accessed
 971 +      directly, bypassing the cache.
 972 +   */
 973 +   MEM_FLAG_DIRECT = 1 << 2,
 974 +
 975 +   /*
 976 +      If a MEM_HANDLE_T is coherent, its block of memory will be accessed in a
 977 +      non-allocating fashion through the cache.
 978 +   */
 979 +   MEM_FLAG_COHERENT = 2 << 2,
 980 +
 981 +   /*
 982 +      If a MEM_HANDLE_T is L1-nonallocating, its block of memory will be accessed by
 983 +      the VPU in a fashion which is allocating in L2, but only coherent in L1.
 984 +   */
 985 +   MEM_FLAG_L1_NONALLOCATING = (MEM_FLAG_DIRECT | MEM_FLAG_COHERENT),
 986 +
 987 +   /*
 988 +      If a MEM_HANDLE_T is zero'd, its contents are set to 0 rather than
 989 +      MEM_HANDLE_INVALID on allocation and resize up.
 990 +   */
 991 +   MEM_FLAG_ZERO = 1 << 4,
 992 +
 993 +   /*
 994 +      If a MEM_HANDLE_T is uninitialised, it will not be reset to a defined value
 995 +      (either zero, or all 1's) on allocation.
 996 +    */
 997 +   MEM_FLAG_NO_INIT = 1 << 5,
 998 +
 999 +   /*
1000 +      Hints.
1001 +   */
1002 +   MEM_FLAG_HINT_PERMALOCK = 1 << 6, /* Likely to be locked for long periods of time. */
1003 +};
1004 +
1005 +unsigned int AllocateVcMemory(unsigned int *pHandle, unsigned int size, unsigned int alignment, unsigned int flags);
1006 +unsigned int ReleaseVcMemory(unsigned int handle);
1007 +unsigned int LockVcMemory(unsigned int *pBusAddress, unsigned int handle);
1008 +unsigned int UnlockVcMemory(unsigned int handle);
1009 +
1010 +unsigned int ExecuteVcCode(unsigned int code,
1011 +               unsigned int r0, unsigned int r1, unsigned int r2, unsigned int r3, unsigned int r4, unsigned int r5);
1012 +
1013 +#endif
1014 diff --git a/arch/arm/mach-bcm2708/vc_support.c b/arch/arm/mach-bcm2708/vc_support.c
1015 new file mode 100755
1016 index 0000000..5cb1335
1017 --- /dev/null
1018 +++ b/arch/arm/mach-bcm2708/vc_support.c
1019 @@ -0,0 +1,319 @@
1020 +/*
1021 + * vc_support.c
1022 + *
1023 + *  Created on: 25 Nov 2012
1024 + *      Author: Simon
1025 + */
1026 +
1027 +#include <linux/module.h>
1028 +#include <mach/vcio.h>
1029 +
1030 +#ifdef ECLIPSE_IGNORE
1031 +
1032 +#define __user
1033 +#define __init
1034 +#define __exit
1035 +#define __iomem
1036 +#define KERN_DEBUG
1037 +#define KERN_ERR
1038 +#define KERN_WARNING
1039 +#define KERN_INFO
1040 +#define _IOWR(a, b, c) b
1041 +#define _IOW(a, b, c) b
1042 +#define _IO(a, b) b
1043 +
1044 +#endif
1045 +
1046 +/****** VC MAILBOX FUNCTIONALITY ******/
1047 +unsigned int AllocateVcMemory(unsigned int *pHandle, unsigned int size, unsigned int alignment, unsigned int flags)
1048 +{
1049 +       struct vc_msg
1050 +       {
1051 +               unsigned int m_msgSize;
1052 +               unsigned int m_response;
1053 +
1054 +               struct vc_tag
1055 +               {
1056 +                       unsigned int m_tagId;
1057 +                       unsigned int m_sendBufferSize;
1058 +                       union {
1059 +                               unsigned int m_sendDataSize;
1060 +                               unsigned int m_recvDataSize;
1061 +                       };
1062 +
1063 +                       struct args
1064 +                       {
1065 +                               union {
1066 +                                       unsigned int m_size;
1067 +                                       unsigned int m_handle;
1068 +                               };
1069 +                               unsigned int m_alignment;
1070 +                               unsigned int m_flags;
1071 +                       } m_args;
1072 +               } m_tag;
1073 +
1074 +               unsigned int m_endTag;
1075 +       } msg;
1076 +       int s;
1077 +
1078 +       msg.m_msgSize = sizeof(msg);
1079 +       msg.m_response = 0;
1080 +       msg.m_endTag = 0;
1081 +
1082 +       //fill in the tag for the allocation command
1083 +       msg.m_tag.m_tagId = 0x3000c;
1084 +       msg.m_tag.m_sendBufferSize = 12;
1085 +       msg.m_tag.m_sendDataSize = 12;
1086 +
1087 +       //fill in our args
1088 +       msg.m_tag.m_args.m_size = size;
1089 +       msg.m_tag.m_args.m_alignment = alignment;
1090 +       msg.m_tag.m_args.m_flags = flags;
1091 +
1092 +       //run the command
1093 +       s = bcm_mailbox_property(&msg, sizeof(msg));
1094 +
1095 +       if (s == 0 && msg.m_response == 0x80000000 && msg.m_tag.m_recvDataSize == 0x80000004)
1096 +       {
1097 +               *pHandle = msg.m_tag.m_args.m_handle;
1098 +               return 0;
1099 +       }
1100 +       else
1101 +       {
1102 +               printk(KERN_ERR "failed to allocate vc memory: s=%d response=%08x recv data size=%08x\n",
1103 +                               s, msg.m_response, msg.m_tag.m_recvDataSize);
1104 +               return 1;
1105 +       }
1106 +}
1107 +
1108 +unsigned int ReleaseVcMemory(unsigned int handle)
1109 +{
1110 +       struct vc_msg
1111 +       {
1112 +               unsigned int m_msgSize;
1113 +               unsigned int m_response;
1114 +
1115 +               struct vc_tag
1116 +               {
1117 +                       unsigned int m_tagId;
1118 +                       unsigned int m_sendBufferSize;
1119 +                       union {
1120 +                               unsigned int m_sendDataSize;
1121 +                               unsigned int m_recvDataSize;
1122 +                       };
1123 +
1124 +                       struct args
1125 +                       {
1126 +                               union {
1127 +                                       unsigned int m_handle;
1128 +                                       unsigned int m_error;
1129 +                               };
1130 +                       } m_args;
1131 +               } m_tag;
1132 +
1133 +               unsigned int m_endTag;
1134 +       } msg;
1135 +       int s;
1136 +
1137 +       msg.m_msgSize = sizeof(msg);
1138 +       msg.m_response = 0;
1139 +       msg.m_endTag = 0;
1140 +
1141 +       //fill in the tag for the release command
1142 +       msg.m_tag.m_tagId = 0x3000f;
1143 +       msg.m_tag.m_sendBufferSize = 4;
1144 +       msg.m_tag.m_sendDataSize = 4;
1145 +
1146 +       //pass across the handle
1147 +       msg.m_tag.m_args.m_handle = handle;
1148 +
1149 +       s = bcm_mailbox_property(&msg, sizeof(msg));
1150 +
1151 +       if (s == 0 && msg.m_response == 0x80000000 && msg.m_tag.m_recvDataSize == 0x80000004 && msg.m_tag.m_args.m_error == 0)
1152 +               return 0;
1153 +       else
1154 +       {
1155 +               printk(KERN_ERR "failed to release vc memory: s=%d response=%08x recv data size=%08x error=%08x\n",
1156 +                               s, msg.m_response, msg.m_tag.m_recvDataSize, msg.m_tag.m_args.m_error);
1157 +               return 1;
1158 +       }
1159 +}
1160 +
1161 +unsigned int LockVcMemory(unsigned int *pBusAddress, unsigned int handle)
1162 +{
1163 +       struct vc_msg
1164 +       {
1165 +               unsigned int m_msgSize;
1166 +               unsigned int m_response;
1167 +
1168 +               struct vc_tag
1169 +               {
1170 +                       unsigned int m_tagId;
1171 +                       unsigned int m_sendBufferSize;
1172 +                       union {
1173 +                               unsigned int m_sendDataSize;
1174 +                               unsigned int m_recvDataSize;
1175 +                       };
1176 +
1177 +                       struct args
1178 +                       {
1179 +                               union {
1180 +                                       unsigned int m_handle;
1181 +                                       unsigned int m_busAddress;
1182 +                               };
1183 +                       } m_args;
1184 +               } m_tag;
1185 +
1186 +               unsigned int m_endTag;
1187 +       } msg;
1188 +       int s;
1189 +
1190 +       msg.m_msgSize = sizeof(msg);
1191 +       msg.m_response = 0;
1192 +       msg.m_endTag = 0;
1193 +
1194 +       //fill in the tag for the lock command
1195 +       msg.m_tag.m_tagId = 0x3000d;
1196 +       msg.m_tag.m_sendBufferSize = 4;
1197 +       msg.m_tag.m_sendDataSize = 4;
1198 +
1199 +       //pass across the handle
1200 +       msg.m_tag.m_args.m_handle = handle;
1201 +
1202 +       s = bcm_mailbox_property(&msg, sizeof(msg));
1203 +
1204 +       if (s == 0 && msg.m_response == 0x80000000 && msg.m_tag.m_recvDataSize == 0x80000004)
1205 +       {
1206 +               //pick out the bus address
1207 +               *pBusAddress = msg.m_tag.m_args.m_busAddress;
1208 +               return 0;
1209 +       }
1210 +       else
1211 +       {
1212 +               printk(KERN_ERR "failed to lock vc memory: s=%d response=%08x recv data size=%08x\n",
1213 +                               s, msg.m_response, msg.m_tag.m_recvDataSize);
1214 +               return 1;
1215 +       }
1216 +}
1217 +
1218 +unsigned int UnlockVcMemory(unsigned int handle)
1219 +{
1220 +       struct vc_msg
1221 +       {
1222 +               unsigned int m_msgSize;
1223 +               unsigned int m_response;
1224 +
1225 +               struct vc_tag
1226 +               {
1227 +                       unsigned int m_tagId;
1228 +                       unsigned int m_sendBufferSize;
1229 +                       union {
1230 +                               unsigned int m_sendDataSize;
1231 +                               unsigned int m_recvDataSize;
1232 +                       };
1233 +
1234 +                       struct args
1235 +                       {
1236 +                               union {
1237 +                                       unsigned int m_handle;
1238 +                                       unsigned int m_error;
1239 +                               };
1240 +                       } m_args;
1241 +               } m_tag;
1242 +
1243 +               unsigned int m_endTag;
1244 +       } msg;
1245 +       int s;
1246 +
1247 +       msg.m_msgSize = sizeof(msg);
1248 +       msg.m_response = 0;
1249 +       msg.m_endTag = 0;
1250 +
1251 +       //fill in the tag for the unlock command
1252 +       msg.m_tag.m_tagId = 0x3000e;
1253 +       msg.m_tag.m_sendBufferSize = 4;
1254 +       msg.m_tag.m_sendDataSize = 4;
1255 +
1256 +       //pass across the handle
1257 +       msg.m_tag.m_args.m_handle = handle;
1258 +
1259 +       s = bcm_mailbox_property(&msg, sizeof(msg));
1260 +
1261 +       //check the error code too
1262 +       if (s == 0 && msg.m_response == 0x80000000 && msg.m_tag.m_recvDataSize == 0x80000004 && msg.m_tag.m_args.m_error == 0)
1263 +               return 0;
1264 +       else
1265 +       {
1266 +               printk(KERN_ERR "failed to unlock vc memory: s=%d response=%08x recv data size=%08x error%08x\n",
1267 +                               s, msg.m_response, msg.m_tag.m_recvDataSize, msg.m_tag.m_args.m_error);
1268 +               return 1;
1269 +       }
1270 +}
1271 +
1272 +unsigned int ExecuteVcCode(unsigned int code,
1273 +               unsigned int r0, unsigned int r1, unsigned int r2, unsigned int r3, unsigned int r4, unsigned int r5)
1274 +{
1275 +       struct vc_msg
1276 +       {
1277 +               unsigned int m_msgSize;
1278 +               unsigned int m_response;
1279 +
1280 +               struct vc_tag
1281 +               {
1282 +                       unsigned int m_tagId;
1283 +                       unsigned int m_sendBufferSize;
1284 +                       union {
1285 +                               unsigned int m_sendDataSize;
1286 +                               unsigned int m_recvDataSize;
1287 +                       };
1288 +
1289 +                       struct args
1290 +                       {
1291 +                               union {
1292 +                                       unsigned int m_pCode;
1293 +                                       unsigned int m_return;
1294 +                               };
1295 +                               unsigned int m_r0;
1296 +                               unsigned int m_r1;
1297 +                               unsigned int m_r2;
1298 +                               unsigned int m_r3;
1299 +                               unsigned int m_r4;
1300 +                               unsigned int m_r5;
1301 +                       } m_args;
1302 +               } m_tag;
1303 +
1304 +               unsigned int m_endTag;
1305 +       } msg;
1306 +       int s;
1307 +
1308 +       msg.m_msgSize = sizeof(msg);
1309 +       msg.m_response = 0;
1310 +       msg.m_endTag = 0;
1311 +
1312 +       //fill in the tag for the unlock command
1313 +       msg.m_tag.m_tagId = 0x30010;
1314 +       msg.m_tag.m_sendBufferSize = 28;
1315 +       msg.m_tag.m_sendDataSize = 28;
1316 +
1317 +       //pass across the handle
1318 +       msg.m_tag.m_args.m_pCode = code;
1319 +       msg.m_tag.m_args.m_r0 = r0;
1320 +       msg.m_tag.m_args.m_r1 = r1;
1321 +       msg.m_tag.m_args.m_r2 = r2;
1322 +       msg.m_tag.m_args.m_r3 = r3;
1323 +       msg.m_tag.m_args.m_r4 = r4;
1324 +       msg.m_tag.m_args.m_r5 = r5;
1325 +
1326 +       s = bcm_mailbox_property(&msg, sizeof(msg));
1327 +
1328 +       //check the error code too
1329 +       if (s == 0 && msg.m_response == 0x80000000 && msg.m_tag.m_recvDataSize == 0x80000004)
1330 +               return msg.m_tag.m_args.m_return;
1331 +       else
1332 +       {
1333 +               printk(KERN_ERR "failed to execute: s=%d response=%08x recv data size=%08x\n",
1334 +                               s, msg.m_response, msg.m_tag.m_recvDataSize);
1335 +               return 1;
1336 +       }
1337 +}
1338 +
1339 --
1340 1.9.1
1341