aboutsummaryrefslogtreecommitdiff
path: root/drivers/renesas/rcar/emmc/emmc_read.c
blob: 96e73ca56ccdc92283e269e6bb2c6eb35e1659e5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * Copyright (c) 2015-2020, Renesas Electronics Corporation. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch_helpers.h>

#include "emmc_config.h"
#include "emmc_def.h"
#include "emmc_hal.h"
#include "emmc_registers.h"
#include "emmc_std.h"

#define MIN_EMMC(a, b)	(((a) < (b)) ? (a) : (b))
#define EMMC_RW_SECTOR_COUNT_MAX	0x0000ffffU

static EMMC_ERROR_CODE emmc_multiple_block_read(uint32_t *buff_address_virtual,
		uint32_t sector_number, uint32_t count,
		HAL_MEMCARD_DATA_TRANSFER_MODE transfer_mode)
{
	EMMC_ERROR_CODE result;

	/* parameter check */
	if ((count > EMMC_RW_SECTOR_COUNT_MAX)
	    || (count == 0)
	    || ((transfer_mode != HAL_MEMCARD_DMA)
		&& (transfer_mode != HAL_MEMCARD_NOT_DMA))
	    ) {
		emmc_write_error_info(EMMC_FUNCNO_READ_SECTOR, EMMC_ERR_PARAM);
		return EMMC_ERR_PARAM;
	}

	/* CMD23 */
	emmc_make_nontrans_cmd(CMD23_SET_BLOCK_COUNT, count);
	result = emmc_exec_cmd(EMMC_R1_ERROR_MASK, mmc_drv_obj.response);
	if (result != EMMC_SUCCESS) {
		return result;
	}
	SETR_32(SD_SECCNT, count);
	SETR_32(SD_STOP, 0x00000100);
	/* SD_BUF Read/Write DMA Transfer enable */
	SETR_32(CC_EXT_MODE, (CC_EXT_MODE_CLEAR | CC_EXT_MODE_DMASDRW_ENABLE));

	/* CMD18 */
	emmc_make_trans_cmd(CMD18_READ_MULTIPLE_BLOCK, sector_number,
			    buff_address_virtual,
			    count << EMMC_SECTOR_SIZE_SHIFT, HAL_MEMCARD_READ,
			    transfer_mode);
	result = emmc_exec_cmd(EMMC_R1_ERROR_MASK, mmc_drv_obj.response);
	if (result != EMMC_SUCCESS) {
		return result;	/* CMD18 error code */
	}

	/* CMD13 */
	emmc_make_nontrans_cmd(CMD13_SEND_STATUS, EMMC_RCA << 16);
	result = emmc_exec_cmd(EMMC_R1_ERROR_MASK, mmc_drv_obj.response);
	if (result != EMMC_SUCCESS) {
		return result;
	}
#if RCAR_BL2_DCACHE == 1
	if (transfer_mode == HAL_MEMCARD_NOT_DMA) {
		flush_dcache_range((uint64_t) buff_address_virtual,
				   ((size_t) count << EMMC_SECTOR_SIZE_SHIFT));
	}
#endif /* RCAR_BL2_DCACHE == 1 */

	/* ready status check */
	if ((mmc_drv_obj.r1_card_status & EMMC_R1_READY) == 0) {
		emmc_write_error_info(EMMC_FUNCNO_READ_SECTOR,
				      EMMC_ERR_CARD_BUSY);
		return EMMC_ERR_CARD_BUSY;
	}

	/* state check */
	if (mmc_drv_obj.current_state != EMMC_R1_STATE_TRAN) {
		emmc_write_error_info(EMMC_FUNCNO_READ_SECTOR,
				      EMMC_ERR_CARD_STATE);
		return EMMC_ERR_CARD_STATE;
	}

	return EMMC_SUCCESS;
}

EMMC_ERROR_CODE emmc_read_sector(uint32_t *buff_address_virtual,
				 uint32_t sector_number,
				 uint32_t count, uint32_t feature_flags)
{
	uint32_t trans_count;
	uint32_t remain;
	EMMC_ERROR_CODE result;
	HAL_MEMCARD_DATA_TRANSFER_MODE transfer_mode;

	/* parameter check */
	if (count == 0) {
		emmc_write_error_info(EMMC_FUNCNO_READ_SECTOR, EMMC_ERR_PARAM);
		return EMMC_ERR_PARAM;
	}

	/* state check */
	if (mmc_drv_obj.mount != TRUE) {
		emmc_write_error_info(EMMC_FUNCNO_READ_SECTOR, EMMC_ERR_STATE);
		return EMMC_ERR_STATE;
	}

	/* DMA? */
	if ((feature_flags & LOADIMAGE_FLAGS_DMA_ENABLE) != 0) {
		transfer_mode = HAL_MEMCARD_DMA;
	} else {
		transfer_mode = HAL_MEMCARD_NOT_DMA;
	}

	remain = count;
	while (remain != 0) {
		trans_count = MIN_EMMC(remain, EMMC_RW_SECTOR_COUNT_MAX);
		result =
		    emmc_multiple_block_read(buff_address_virtual,
					     sector_number, trans_count,
					     transfer_mode);
		if (result != EMMC_SUCCESS) {
			return result;
		}

		buff_address_virtual += (EMMC_BLOCK_LENGTH_DW * trans_count);
		sector_number += trans_count;
		remain -= trans_count;
	}

	return EMMC_SUCCESS;
}