LXR uboot/drivers/mmc/sdhci-adma.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * SDHCI ADMA2 helper functions.
   4 */
   5
   6#include <common.h>
   7#include <cpu_func.h>
   8#include <sdhci.h>
   9#include <malloc.h>
  10#include <asm/cache.h>
  11
  12static void sdhci_adma_desc(struct sdhci_adma_desc *desc,
  13                            dma_addr_t addr, u16 len, bool end)
  14{
  15        u8 attr;
  16
  17        attr = ADMA_DESC_ATTR_VALID | ADMA_DESC_TRANSFER_DATA;
  18        if (end)
  19                attr |= ADMA_DESC_ATTR_END;
  20
  21        desc->attr = attr;
  22        desc->len = len;
  23        desc->reserved = 0;
  24        desc->addr_lo = lower_32_bits(addr);
  25#ifdef CONFIG_DMA_ADDR_T_64BIT
  26        desc->addr_hi = upper_32_bits(addr);
  27#endif
  28}
  29
  30/**
  31 * sdhci_prepare_adma_table() - Populate the ADMA table
  32 *
  33 * @table:      Pointer to the ADMA table
  34 * @data:       Pointer to MMC data
  35 * @addr:       DMA address to write to or read from
  36 *
  37 * Fill the ADMA table according to the MMC data to read from or write to the
  38 * given DMA address.
  39 * Please note, that the table size depends on CONFIG_SYS_MMC_MAX_BLK_COUNT and
  40 * we don't have to check for overflow.
  41 */
  42void sdhci_prepare_adma_table(struct sdhci_adma_desc *table,
  43                              struct mmc_data *data, dma_addr_t addr)
  44{
  45        uint trans_bytes = data->blocksize * data->blocks;
  46        uint desc_count = DIV_ROUND_UP(trans_bytes, ADMA_MAX_LEN);
  47        struct sdhci_adma_desc *desc = table;
  48        int i = desc_count;
  49
  50        while (--i) {
  51                sdhci_adma_desc(desc, addr, ADMA_MAX_LEN, false);
  52                addr += ADMA_MAX_LEN;
  53                trans_bytes -= ADMA_MAX_LEN;
  54                desc++;
  55        }
  56
  57        sdhci_adma_desc(desc, addr, trans_bytes, true);
  58
  59        flush_cache((dma_addr_t)table,
  60                    ROUND(desc_count * sizeof(struct sdhci_adma_desc),
  61                          ARCH_DMA_MINALIGN));
  62}
  63
  64/**
  65 * sdhci_adma_init() - initialize the ADMA descriptor table
  66 *
  67 * @return pointer to the allocated descriptor table or NULL in case of an
  68 * error.
  69 */
  70struct sdhci_adma_desc *sdhci_adma_init(void)
  71{
  72        return memalign(ARCH_DMA_MINALIGN, ADMA_TABLE_SZ);
  73}
  74