drivers/media/platform/sti/hva/hva-mem.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2015
   3  * Authors: Yannick Fertre <yannick.fertre@st.com>
   4  *          Hugues Fruchet <hugues.fruchet@st.com>
   5  * License terms:  GNU General Public License (GPL), version 2
   6  */
   7
   8 #include "hva.h"
   9 #include "hva-mem.h"
  10
  11 int hva_mem_alloc(struct hva_ctx *ctx, u32 size, const char *name,
  12                   struct hva_buffer **buf)
  13 {
  14         struct device *dev = ctx_to_dev(ctx);
  15         struct hva_buffer *b;
  16         dma_addr_t paddr;
  17         void *base;
  18
  19         b = devm_kzalloc(dev, sizeof(*b), GFP_KERNEL);
  20         if (!b)
  21                 return -ENOMEM;
  22
  23         base = dma_alloc_attrs(dev, size, &paddr, GFP_KERNEL | GFP_DMA,
  24                                DMA_ATTR_WRITE_COMBINE);
  25         if (!base) {
  26                 dev_err(dev, "%s %s : dma_alloc_attrs failed for %s (size=%d)\n",
  27                         ctx->name, __func__, name, size);
  28                 devm_kfree(dev, b);
  29                 return -ENOMEM;
  30         }
  31
  32         b->size = size;
  33         b->paddr = paddr;
  34         b->vaddr = base;
  35         b->name = name;
  36
  37         dev_dbg(dev,
  38                 "%s allocate %d bytes of HW memory @(virt=%p, phy=%pad): %s\n",
  39                 ctx->name, size, b->vaddr, &b->paddr, b->name);
  40
  41         /* return  hva buffer to user */
  42         *buf = b;
  43
  44         return 0;
  45 }
  46
  47 void hva_mem_free(struct hva_ctx *ctx, struct hva_buffer *buf)
  48 {
  49         struct device *dev = ctx_to_dev(ctx);
  50
  51         dev_dbg(dev,
  52                 "%s free %d bytes of HW memory @(virt=%p, phy=%pad): %s\n",
  53                 ctx->name, buf->size, buf->vaddr, &buf->paddr, buf->name);
  54
  55         dma_free_attrs(dev, buf->size, buf->vaddr, buf->paddr,
  56                        DMA_ATTR_WRITE_COMBINE);
  57
  58         devm_kfree(dev, buf);
  59 }