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mmc: sdhci: use dma_map_single() instead of flush_cache() before DMA

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Currently, sdhci_prepare_dma() calls flush_cache() regardless of the
DMA direction.

Actually, cache invalidation is enough when reading data from the device.

This is correctly handled by dma_map_single(), which mimics the DMA-API
in Linux kernel. Drivers can be agnostic which cache operation occurs
behind the scene.

This commit also sanitizes the difference between the virtual address
and the dma address.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2020-02-14 16:40:26 +09:00 committed by Peng Fan
parent a7b2b6cc0a
commit 58d8ace12b
1 changed files with 25 additions and 26 deletions
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51
drivers/mmc/sdhci.c
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@ -15,6 +15,7 @@
#include <mmc.h>
#include <sdhci.h>
#include <dm.h>
#include <linux/dma-mapping.h>
static void sdhci_reset(struct sdhci_host *host, u8 mask)
{
@ -65,8 +66,8 @@ static void sdhci_transfer_pio(struct sdhci_host *host, struct mmc_data *data)
}
#if CONFIG_IS_ENABLED(MMC_SDHCI_ADMA)
static void sdhci_adma_desc(struct sdhci_host *host, char *buf, u16 len,
bool end)
static void sdhci_adma_desc(struct sdhci_host *host, dma_addr_t dma_addr,
u16 len, bool end)
{
struct sdhci_adma_desc *desc;
u8 attr;
@ -82,9 +83,9 @@ static void sdhci_adma_desc(struct sdhci_host *host, char *buf, u16 len,
desc->attr = attr;
desc->len = len;
desc->reserved = 0;
desc->addr_lo = (dma_addr_t)buf;
desc->addr_lo = lower_32_bits(dma_addr);
#ifdef CONFIG_DMA_ADDR_T_64BIT
desc->addr_hi = (u64)buf >> 32;
desc->addr_hi = upper_32_bits(dma_addr);
#endif
}
@ -94,22 +95,17 @@ static void sdhci_prepare_adma_table(struct sdhci_host *host,
uint trans_bytes = data->blocksize * data->blocks;
uint desc_count = DIV_ROUND_UP(trans_bytes, ADMA_MAX_LEN);
int i = desc_count;
char *buf;
dma_addr_t dma_addr = host->start_addr;
host->desc_slot = 0;
if (data->flags & MMC_DATA_READ)
buf = data->dest;
else
buf = (char *)data->src;
while (--i) {
sdhci_adma_desc(host, buf, ADMA_MAX_LEN, false);
buf += ADMA_MAX_LEN;
sdhci_adma_desc(host, dma_addr, ADMA_MAX_LEN, false);
dma_addr += ADMA_MAX_LEN;
trans_bytes -= ADMA_MAX_LEN;
}
sdhci_adma_desc(host, buf, trans_bytes, true);
sdhci_adma_desc(host, dma_addr, trans_bytes, true);
flush_cache((dma_addr_t)host->adma_desc_table,
ROUND(desc_count * sizeof(struct sdhci_adma_desc),
@ -125,11 +121,12 @@ static void sdhci_prepare_dma(struct sdhci_host *host, struct mmc_data *data,
int *is_aligned, int trans_bytes)
{
unsigned char ctrl;
void *buf;
if (data->flags == MMC_DATA_READ)
host->start_addr = (dma_addr_t)data->dest;
buf = data->dest;
else
host->start_addr = (dma_addr_t)data->src;
buf = (void *)data->src;
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
ctrl &= ~SDHCI_CTRL_DMA_MASK;
@ -139,16 +136,20 @@ static void sdhci_prepare_dma(struct sdhci_host *host, struct mmc_data *data,
ctrl |= SDHCI_CTRL_ADMA32;
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
if (host->flags & USE_SDMA &&
(host->force_align_buffer ||
(host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR &&
((unsigned long)buf & 0x7) != 0x0))) {
*is_aligned = 0;
if (data->flags != MMC_DATA_READ)
memcpy(host->align_buffer, buf, trans_bytes);
buf = host->align_buffer;
}
host->start_addr = dma_map_single(buf, trans_bytes,
mmc_get_dma_dir(data));
if (host->flags & USE_SDMA) {
if (host->force_align_buffer ||
(host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR &&
(host->start_addr & 0x7) != 0x0)) {
*is_aligned = 0;
host->start_addr = (unsigned long)host->align_buffer;
if (data->flags != MMC_DATA_READ)
memcpy(host->align_buffer, data->src,
trans_bytes);
}
sdhci_writel(host, host->start_addr, SDHCI_DMA_ADDRESS);
} else if (host->flags & (USE_ADMA | USE_ADMA64)) {
sdhci_prepare_adma_table(host, data);
@ -159,8 +160,6 @@ static void sdhci_prepare_dma(struct sdhci_host *host, struct mmc_data *data,
sdhci_writel(host, upper_32_bits(host->adma_addr),
SDHCI_ADMA_ADDRESS_HI);
}
flush_cache(host->start_addr, ROUND(trans_bytes, ARCH_DMA_MINALIGN));
}
#else
static void sdhci_prepare_dma(struct sdhci_host *host, struct mmc_data *data,