diff options
Diffstat (limited to 'drivers/media/platform/st/sti/hva/hva-mem.c')
-rw-r--r-- | drivers/media/platform/st/sti/hva/hva-mem.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/media/platform/st/sti/hva/hva-mem.c b/drivers/media/platform/st/sti/hva/hva-mem.c new file mode 100644 index 000000000..68047b60b --- /dev/null +++ b/drivers/media/platform/st/sti/hva/hva-mem.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) STMicroelectronics SA 2015 + * Authors: Yannick Fertre <yannick.fertre@st.com> + * Hugues Fruchet <hugues.fruchet@st.com> + */ + +#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, + 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); +} |