summaryrefslogtreecommitdiff
path: root/src/drivers/spi/amic.c
blob: 4f3002c73b9e73213365eabdfb0be4ea89e25abe (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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/*
 * Copyright (C) 2014 Idwer Vollering <vidwer@gmail.com>
 *
 * Based on winbond.c
 *
 * Copyright 2008, Network Appliance Inc.
 * Author: Jason McMullan <mcmullan <at> netapp.com>
 * Licensed under the GPL-2 or later.
 */

#include <console/console.h>
#include <stdlib.h>
#include <spi_flash.h>
#include <spi-generic.h>

#include "spi_flash_internal.h"

/* A25L-specific commands */
#define CMD_A25_WREN		0x06	/* Write Enable */
#define CMD_A25_WRDI		0x04	/* Write Disable */
#define CMD_A25_RDSR		0x05	/* Read Status Register */
#define CMD_A25_WRSR		0x01	/* Write Status Register */
#define CMD_A25_READ		0x03	/* Read Data Bytes */
#define CMD_A25_FAST_READ	0x0b	/* Read Data Bytes at Higher Speed */
#define CMD_A25_PP		0x02	/* Page Program */
#define CMD_A25_SE		0x20	/* Sector (4K) Erase */
#define CMD_A25_BE		0xd8	/* Block (64K) Erase */
#define CMD_A25_CE		0xc7	/* Chip Erase */
#define CMD_A25_DP		0xb9	/* Deep Power-down */
#define CMD_A25_RES		0xab	/* Release from DP, and Read Signature */

struct amic_spi_flash_params {
	uint16_t	id;
	/* Log2 of page size in power-of-two mode */
	uint8_t		l2_page_size;
	uint16_t	pages_per_sector;
	uint16_t	sectors_per_block;
	uint16_t	nr_blocks;
	const char	*name;
};

/* spi_flash needs to be first so upper layers can free() it */
struct amic_spi_flash {
	struct spi_flash flash;
	const struct amic_spi_flash_params *params;
};

static inline struct amic_spi_flash *
to_amic_spi_flash(const struct spi_flash *flash)
{
	return container_of(flash, struct amic_spi_flash, flash);
}

static const struct amic_spi_flash_params amic_spi_flash_table[] = {
	{
		.id			= 0x3016,
		.l2_page_size		= 8,
		.pages_per_sector	= 16,
		.sectors_per_block	= 16,
		.nr_blocks		= 64,
		.name			= "A25L032",
	},
};

static int amic_write(const struct spi_flash *flash, u32 offset, size_t len,
		const void *buf)
{
	struct amic_spi_flash *amic = to_amic_spi_flash(flash);
	unsigned long byte_addr;
	unsigned long page_size;
	size_t chunk_len;
	size_t actual;
	int ret;
	u8 cmd[4];

	page_size = 1 << amic->params->l2_page_size;
	byte_addr = offset % page_size;

	for (actual = 0; actual < len; actual += chunk_len) {
		chunk_len = min(len - actual, page_size - byte_addr);
		chunk_len = spi_crop_chunk(sizeof(cmd), chunk_len);

		cmd[0] = CMD_A25_PP;
		cmd[1] = (offset >> 16) & 0xff;
		cmd[2] = (offset >> 8) & 0xff;
		cmd[3] = offset & 0xff;
#if CONFIG_DEBUG_SPI_FLASH
		printk(BIOS_SPEW, "PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x }"
		        " chunk_len = %zu\n", buf + actual,
			cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
#endif

		ret = spi_flash_cmd(flash->spi, CMD_A25_WREN, NULL, 0);
		if (ret < 0) {
			printk(BIOS_WARNING, "SF: Enabling Write failed\n");
			goto out;
		}

		ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd),
				buf + actual, chunk_len);
		if (ret < 0) {
			printk(BIOS_WARNING, "SF: AMIC Page Program failed\n");
			goto out;
		}

		ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
		if (ret)
			goto out;

		offset += chunk_len;
		byte_addr = 0;
	}

#if CONFIG_DEBUG_SPI_FLASH
	printk(BIOS_SPEW, "SF: AMIC: Successfully programmed %zu bytes @"
			" 0x%lx\n", len, (unsigned long)(offset - len));
#endif
	ret = 0;

out:
	return ret;
}

struct spi_flash *spi_flash_probe_amic(struct spi_slave *spi, u8 *idcode)
{
	const struct amic_spi_flash_params *params;
	unsigned page_size;
	struct amic_spi_flash *amic;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(amic_spi_flash_table); i++) {
		params = &amic_spi_flash_table[i];
		if (params->id == ((idcode[1] << 8) | idcode[2]))
			break;
	}

	if (i == ARRAY_SIZE(amic_spi_flash_table)) {
		printk(BIOS_WARNING, "SF: Unsupported AMIC ID %02x%02x\n",
				idcode[1], idcode[2]);
		return NULL;
	}

	amic = malloc(sizeof(struct amic_spi_flash));
	if (!amic) {
		printk(BIOS_WARNING, "SF: Failed to allocate memory\n");
		return NULL;
	}

	amic->params = params;
	amic->flash.spi = spi;
	amic->flash.name = params->name;

	/* Assuming power-of-two page size initially. */
	page_size = 1 << params->l2_page_size;

	amic->flash.internal_write = amic_write;
	amic->flash.internal_erase = spi_flash_cmd_erase;
#if CONFIG_SPI_FLASH_NO_FAST_READ
	amic->flash.internal_read = spi_flash_cmd_read_slow;
#else
	amic->flash.internal_read = spi_flash_cmd_read_fast;
#endif
	amic->flash.sector_size = (1 << amic->params->l2_page_size) *
		amic->params->pages_per_sector;
	amic->flash.size = page_size * params->pages_per_sector
				* params->sectors_per_block
				* params->nr_blocks;
	amic->flash.erase_cmd = CMD_A25_SE;

	return &amic->flash;
}