sunxi: mmc: group non-DM specific functions
[platform/kernel/u-boot.git] / 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
12 static 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  */
42 void 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  */
70 struct sdhci_adma_desc *sdhci_adma_init(void)
71 {
72         return memalign(ARCH_DMA_MINALIGN, ADMA_TABLE_SZ);
73 }