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Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* SDHCI ADMA2 helper functions.
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <sdhci.h>
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#include <malloc.h>
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#include <asm/cache.h>
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static void sdhci_adma_desc(struct sdhci_adma_desc *desc,
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dma_addr_t addr, u16 len, bool end)
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{
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u8 attr;
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attr = ADMA_DESC_ATTR_VALID | ADMA_DESC_TRANSFER_DATA;
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if (end)
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attr |= ADMA_DESC_ATTR_END;
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desc->attr = attr;
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desc->len = len;
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desc->reserved = 0;
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desc->addr_lo = lower_32_bits(addr);
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#ifdef CONFIG_DMA_ADDR_T_64BIT
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desc->addr_hi = upper_32_bits(addr);
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#endif
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}
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/**
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* sdhci_prepare_adma_table() - Populate the ADMA table
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*
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* @table: Pointer to the ADMA table
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* @data: Pointer to MMC data
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* @addr: DMA address to write to or read from
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*
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* Fill the ADMA table according to the MMC data to read from or write to the
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* given DMA address.
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* Please note, that the table size depends on CONFIG_SYS_MMC_MAX_BLK_COUNT and
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* we don't have to check for overflow.
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*/
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void sdhci_prepare_adma_table(struct sdhci_adma_desc *table,
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struct mmc_data *data, dma_addr_t addr)
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{
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uint trans_bytes = data->blocksize * data->blocks;
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uint desc_count = DIV_ROUND_UP(trans_bytes, ADMA_MAX_LEN);
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struct sdhci_adma_desc *desc = table;
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int i = desc_count;
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while (--i) {
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sdhci_adma_desc(desc, addr, ADMA_MAX_LEN, false);
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addr += ADMA_MAX_LEN;
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trans_bytes -= ADMA_MAX_LEN;
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desc++;
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}
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sdhci_adma_desc(desc, addr, trans_bytes, true);
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flush_cache((dma_addr_t)table,
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ROUND(desc_count * sizeof(struct sdhci_adma_desc),
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ARCH_DMA_MINALIGN));
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}
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/**
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* sdhci_adma_init() - initialize the ADMA descriptor table
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*
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* Return: pointer to the allocated descriptor table or NULL in case of an
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* error.
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*/
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struct sdhci_adma_desc *sdhci_adma_init(void)
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{
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return memalign(ARCH_DMA_MINALIGN, ADMA_TABLE_SZ);
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}
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