1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/*
* Copyright (C) STMicroelectronics SA 2015
* Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.
* License terms: GNU General Public License (GPL), version 2
*/
#include "delta.h"
#include "delta-mem.h"
int hw_alloc(struct delta_ctx *ctx, u32 size, const char *name,
struct delta_buf *buf)
{
struct delta_dev *delta = ctx->dev;
dma_addr_t dma_addr;
void *addr;
unsigned long attrs = DMA_ATTR_WRITE_COMBINE;
addr = dma_alloc_attrs(delta->dev, size, &dma_addr,
GFP_KERNEL | __GFP_NOWARN, attrs);
if (!addr) {
dev_err(delta->dev,
"%s hw_alloc:dma_alloc_coherent failed for %s (size=%d)\n",
ctx->name, name, size);
ctx->sys_errors++;
return -ENOMEM;
}
buf->size = size;
buf->paddr = dma_addr;
buf->vaddr = addr;
buf->name = name;
buf->attrs = attrs;
dev_dbg(delta->dev,
"%s allocate %d bytes of HW memory @(virt=0x%p, phy=0x%pad): %s\n",
ctx->name, size, buf->vaddr, &buf->paddr, buf->name);
return 0;
}
void hw_free(struct delta_ctx *ctx, struct delta_buf *buf)
{
struct delta_dev *delta = ctx->dev;
dev_dbg(delta->dev,
"%s free %d bytes of HW memory @(virt=0x%p, phy=0x%pad): %s\n",
ctx->name, buf->size, buf->vaddr, &buf->paddr, buf->name);
dma_free_attrs(delta->dev, buf->size,
buf->vaddr, buf->paddr, buf->attrs);
}
|
