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mmc: sdhci: introduce adma_write_desc() hook to struct sdhci_ops

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Add this hook so that it can be overridden with driver specific
implementations. We also let the original sdhci_adma_write_desc()
accept &desc so that the function can set its new value. Then export
the function so that it could be reused by driver's specific
implementations.

The above is a port of Linux kernel commit 54552e4948cbf

In addition, allow drivers to allocate their own ADMA descriptor
tables if additional space is required.

Finally, fix the assignment of adma_addr to fix compiler warning
on 64-bit platforms that still use 32-bit DMA addressing.

Co-developed-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Signed-off-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Co-developed-by: Greg Malysa <greg.malysa@timesys.com>
Signed-off-by: Greg Malysa <greg.malysa@timesys.com>
Signed-off-by: Ian Roberts <ian.roberts@timesys.com>
This commit is contained in:
Ian Roberts
2024-04-22 15:00:02 -04:00
committed by Jaehoon Chung
parent d097f9e129
commit 74755c1fed
4 changed files with 44 additions and 19 deletions
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2
drivers/mmc/fsl_esdhc.c
View File

@@ -252,7 +252,7 @@ static void esdhc_setup_dma(struct fsl_esdhc_priv *priv, struct mmc_data *data)
priv->adma_desc_table) {
debug("Using ADMA2\n");
/* prefer ADMA2 if it is available */
sdhci_prepare_adma_table(priv->adma_desc_table, data,
sdhci_prepare_adma_table(NULL, priv->adma_desc_table, data,
priv->dma_addr);
adma_addr = virt_to_phys(priv->adma_desc_table);

41
drivers/mmc/sdhci-adma.c
View File

@@ -9,9 +9,10 @@
#include <malloc.h>
#include <asm/cache.h>
static void sdhci_adma_desc(struct sdhci_adma_desc *desc,
dma_addr_t addr, u16 len, bool end)
void sdhci_adma_write_desc(struct sdhci_host *host, void **next_desc,
dma_addr_t addr, int len, bool end)
{
struct sdhci_adma_desc *desc = *next_desc;
u8 attr;
attr = ADMA_DESC_ATTR_VALID | ADMA_DESC_TRANSFER_DATA;
@@ -19,17 +20,30 @@ static void sdhci_adma_desc(struct sdhci_adma_desc *desc,
attr |= ADMA_DESC_ATTR_END;
desc->attr = attr;
desc->len = len;
desc->len = len & 0xffff;
desc->reserved = 0;
desc->addr_lo = lower_32_bits(addr);
#ifdef CONFIG_DMA_ADDR_T_64BIT
desc->addr_hi = upper_32_bits(addr);
#endif
*next_desc += ADMA_DESC_LEN;
}
static inline void __sdhci_adma_write_desc(struct sdhci_host *host,
void **desc, dma_addr_t addr,
int len, bool end)
{
if (host && host->ops && host->ops->adma_write_desc)
host->ops->adma_write_desc(host, desc, addr, len, end);
else
sdhci_adma_write_desc(host, desc, addr, len, end);
}
/**
* sdhci_prepare_adma_table() - Populate the ADMA table
*
* @host: Pointer to the sdhci_host
* @table: Pointer to the ADMA table
* @data: Pointer to MMC data
* @addr: DMA address to write to or read from
@@ -39,25 +53,26 @@ static void sdhci_adma_desc(struct sdhci_adma_desc *desc,
* Please note, that the table size depends on CONFIG_SYS_MMC_MAX_BLK_COUNT and
* we don't have to check for overflow.
*/
void sdhci_prepare_adma_table(struct sdhci_adma_desc *table,
struct mmc_data *data, dma_addr_t addr)
void sdhci_prepare_adma_table(struct sdhci_host *host,
struct sdhci_adma_desc *table,
struct mmc_data *data, dma_addr_t start_addr)
{
dma_addr_t addr = start_addr;
uint trans_bytes = data->blocksize * data->blocks;
uint desc_count = DIV_ROUND_UP(trans_bytes, ADMA_MAX_LEN);
struct sdhci_adma_desc *desc = table;
int i = desc_count;
void *next_desc = table;
int i = DIV_ROUND_UP(trans_bytes, ADMA_MAX_LEN);
while (--i) {
sdhci_adma_desc(desc, addr, ADMA_MAX_LEN, false);
__sdhci_adma_write_desc(host, &next_desc, addr,
ADMA_MAX_LEN, false);
addr += ADMA_MAX_LEN;
trans_bytes -= ADMA_MAX_LEN;
desc++;
}
sdhci_adma_desc(desc, addr, trans_bytes, true);
__sdhci_adma_write_desc(host, &next_desc, addr, trans_bytes, true);
flush_cache((dma_addr_t)table,
ROUND(desc_count * sizeof(struct sdhci_adma_desc),
flush_cache((phys_addr_t)table,
ROUND(next_desc - (void *)table,
ARCH_DMA_MINALIGN));
}

6
drivers/mmc/sdhci.c
View File

@@ -111,7 +111,7 @@ static void sdhci_prepare_dma(struct sdhci_host *host, struct mmc_data *data,
}
#if CONFIG_IS_ENABLED(MMC_SDHCI_ADMA)
else if (host->flags & (USE_ADMA | USE_ADMA64)) {
sdhci_prepare_adma_table(host->adma_desc_table, data,
sdhci_prepare_adma_table(host, host->adma_desc_table, data,
host->start_addr);
sdhci_writel(host, lower_32_bits(host->adma_addr),
@@ -897,8 +897,10 @@ int sdhci_setup_cfg(struct mmc_config *cfg, struct sdhci_host *host,
__func__);
return -EINVAL;
}
if (!host->adma_desc_table) {
host->adma_desc_table = sdhci_adma_init();
host->adma_addr = (dma_addr_t)host->adma_desc_table;
host->adma_addr = virt_to_phys(host->adma_desc_table);
}
#ifdef CONFIG_DMA_ADDR_T_64BIT
host->flags |= USE_ADMA64;

12
include/sdhci.h
View File

@@ -291,6 +291,11 @@ struct sdhci_ops {
* Return: 0 if successful, -ve on error
*/
int (*set_enhanced_strobe)(struct sdhci_host *host);
#ifdef CONFIG_MMC_SDHCI_ADMA_HELPERS
void (*adma_write_desc)(struct sdhci_host *host, void **desc,
dma_addr_t addr, int len, bool end);
#endif
};
#define ADMA_MAX_LEN 65532
@@ -526,8 +531,11 @@ extern const struct dm_mmc_ops sdhci_ops;
#else
#endif
void sdhci_adma_write_desc(struct sdhci_host *host, void **next_desc,
dma_addr_t addr, int len, bool end);
struct sdhci_adma_desc *sdhci_adma_init(void);
void sdhci_prepare_adma_table(struct sdhci_adma_desc *table,
struct mmc_data *data, dma_addr_t addr);
void sdhci_prepare_adma_table(struct sdhci_host *host,
struct sdhci_adma_desc *table,
struct mmc_data *data, dma_addr_t start_addr);
#endif /* __SDHCI_HW_H */