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/*
* Copyright (C) STMicroelectronics SA 2015
* Authors: Yannick Fertre <yannick.fertre@st.com>
* Hugues Fruchet <hugues.fruchet@st.com>
* License terms: GNU General Public License (GPL), version 2
*/
#include "hva.h"
#include "hva-mem.h"
int hva_mem_alloc(struct hva_ctx *ctx, u32 size, const char *name,
struct hva_buffer **buf)
{
struct device *dev = ctx_to_dev(ctx);
struct hva_buffer *b;
dma_addr_t paddr;
void *base;
b = devm_kzalloc(dev, sizeof(*b), GFP_KERNEL);
if (!b) {
ctx->sys_errors++;
return -ENOMEM;
}
base = dma_alloc_attrs(dev, size, &paddr, GFP_KERNEL | GFP_DMA,
DMA_ATTR_WRITE_COMBINE);
if (!base) {
dev_err(dev, "%s %s : dma_alloc_attrs failed for %s (size=%d)\n",
ctx->name, __func__, name, size);
ctx->sys_errors++;
devm_kfree(dev, b);
return -ENOMEM;
}
b->size = size;
b->paddr = paddr;
b->vaddr = base;
b->name = name;
dev_dbg(dev,
"%s allocate %d bytes of HW memory @(virt=%p, phy=%pad): %s\n",
ctx->name, size, b->vaddr, &b->paddr, b->name);
/* return hva buffer to user */
*buf = b;
return 0;
}
void hva_mem_free(struct hva_ctx *ctx, struct hva_buffer *buf)
{
struct device *dev = ctx_to_dev(ctx);
dev_dbg(dev,
"%s free %d bytes of HW memory @(virt=%p, phy=%pad): %s\n",
ctx->name, buf->size, buf->vaddr, &buf->paddr, buf->name);
dma_free_attrs(dev, buf->size, buf->vaddr, buf->paddr,
DMA_ATTR_WRITE_COMBINE);
devm_kfree(dev, buf);
}
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