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drivers: dma: ti-edma3: add support for memory fill

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Add support for simple memory fill operation. With large data sizes
it is much faster to use EDMA for memory fill rather than CPU.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
This commit is contained in:
Tero Kristo 2017-12-29 11:47:46 +05:30 committed by Tom Rini
parent 445277b9d1
commit 72b7af5a04
2 changed files with 50 additions and 7 deletions
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2
arch/arm/include/asm/ti-common/ti-edma3.h
View File

@ -119,5 +119,7 @@ void edma3_set_transfer_params(u32 base, int slot, int acnt,
enum edma3_sync_dimension sync_mode);
void edma3_transfer(unsigned long edma3_base_addr, unsigned int
edma_slot_num, void *dst, void *src, size_t len);
void edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num,
void *dst, u8 val, size_t len);
#endif

55
drivers/dma/ti-edma3.c
View File

@ -34,10 +34,14 @@
#define EDMA3_QEESR 0x108c
#define EDMA3_QSECR 0x1094
#define EDMA_FILL_BUFFER_SIZE 512
struct ti_edma3_priv {
u32 base;
};
static u8 edma_fill_buffer[EDMA_FILL_BUFFER_SIZE] __aligned(ARCH_DMA_MINALIGN);
/**
* qedma3_start - start qdma on a channel
* @base: base address of edma
@ -391,7 +395,7 @@ void qedma3_stop(u32 base, struct edma3_channel_config *cfg)
}
void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num,
void *dst, void *src, size_t len)
void *dst, void *src, size_t len, size_t s_len)
{
struct edma3_slot_config slot;
struct edma3_channel_config edma_channel;
@ -401,7 +405,11 @@ void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num,
unsigned int addr = (unsigned int) (dst);
unsigned int max_acnt = 0x7FFFU;
if (len > max_acnt) {
if (len > s_len) {
b_cnt_value = (len / s_len);
rem_bytes = (len % s_len);
a_cnt_value = s_len;
} else if (len > max_acnt) {
b_cnt_value = (len / max_acnt);
rem_bytes = (len % max_acnt);
a_cnt_value = max_acnt;
@ -412,7 +420,10 @@ void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num,
slot.acnt = a_cnt_value;
slot.bcnt = b_cnt_value;
slot.ccnt = 1;
slot.src_bidx = a_cnt_value;
if (len == s_len)
slot.src_bidx = a_cnt_value;
else
slot.src_bidx = 0;
slot.dst_bidx = a_cnt_value;
slot.src_cidx = 0;
slot.dst_cidx = 0;
@ -438,8 +449,11 @@ void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num,
if (rem_bytes != 0) {
slot.opt = 0;
slot.src =
(b_cnt_value * max_acnt) + ((unsigned int) src);
if (len == s_len)
slot.src =
(b_cnt_value * max_acnt) + ((unsigned int) src);
else
slot.src = (unsigned int) src;
slot.acnt = rem_bytes;
slot.bcnt = 1;
slot.ccnt = 1;
@ -468,12 +482,39 @@ void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num,
}
}
void __edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num,
void *dst, u8 val, size_t len)
{
int xfer_len;
int max_xfer = EDMA_FILL_BUFFER_SIZE * 65535;
memset((void *)edma_fill_buffer, val, sizeof(edma_fill_buffer));
while (len) {
xfer_len = len;
if (xfer_len > max_xfer)
xfer_len = max_xfer;
__edma3_transfer(edma3_base_addr, edma_slot_num, dst,
edma_fill_buffer, xfer_len,
EDMA_FILL_BUFFER_SIZE);
len -= xfer_len;
dst += xfer_len;
}
}
#ifndef CONFIG_DMA
void edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num,
void *dst, void *src, size_t len)
{
__edma3_transfer(edma3_base_addr, edma_slot_num, dst, src, len);
__edma3_transfer(edma3_base_addr, edma_slot_num, dst, src, len, len);
}
void edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num,
void *dst, u8 val, size_t len)
{
__edma3_fill(edma3_base_addr, edma_slot_num, dst, val, len);
}
#else
@ -488,7 +529,7 @@ static int ti_edma3_transfer(struct udevice *dev, int direction, void *dst,
switch (direction) {
case DMA_MEM_TO_MEM:
__edma3_transfer(priv->base, 1, dst, src, len);
__edma3_transfer(priv->base, 1, dst, src, len, len);
break;
default:
pr_err("Transfer type not implemented in DMA driver\n");