mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-23 11:33:32 +00:00
4d6a773b1c
There are other (non-SDHCI) controllers which supports ADMA2 descriptor tables, namely the Freescale eSDHC. Instead of copying the code, move it into an own module. Signed-off-by: Michael Walle <michael@walle.cc>
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
// 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);
|
|
}
|