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// SPDX-License-Identifier: GPL-2.0+
/*
* SDHCI ADMA2 helper functions.
*/
#include <common.h>
#include <cpu_func.h>
#include <sdhci.h>
#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)
{
u8 attr;
attr = ADMA_DESC_ATTR_VALID | ADMA_DESC_TRANSFER_DATA;
if (end)
attr |= ADMA_DESC_ATTR_END;
desc->attr = attr;
desc->len = len;
desc->reserved = 0;
desc->addr_lo = lower_32_bits(addr);
#ifdef CONFIG_DMA_ADDR_T_64BIT
desc->addr_hi = upper_32_bits(addr);
#endif
}
/**
* sdhci_prepare_adma_table() - Populate the ADMA table
*
* @table: Pointer to the ADMA table
* @data: Pointer to MMC data
* @addr: DMA address to write to or read from
*
* Fill the ADMA table according to the MMC data to read from or write to the
* given DMA address.
* 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)
{
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;
while (--i) {
sdhci_adma_desc(desc, addr, ADMA_MAX_LEN, false);
addr += ADMA_MAX_LEN;
trans_bytes -= ADMA_MAX_LEN;
desc++;
}
sdhci_adma_desc(desc, addr, trans_bytes, true);
flush_cache((dma_addr_t)table,
ROUND(desc_count * sizeof(struct sdhci_adma_desc),
ARCH_DMA_MINALIGN));
}
/**
* sdhci_adma_init() - initialize the ADMA descriptor table
*
* Return: pointer to the allocated descriptor table or NULL in case of an
* error.
*/
struct sdhci_adma_desc *sdhci_adma_init(void)
{
return memalign(ARCH_DMA_MINALIGN, ADMA_TABLE_SZ);
}
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