summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/spi-nor/xilinx.c
blob: f99118c691b03e860050c789e18404b6f09af5d4 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2005, Intec Automation Inc.
 * Copyright (C) 2014, Freescale Semiconductor, Inc.
 */

#include <linux/mtd/spi-nor.h>

#include "core.h"

#define XILINX_OP_SE		0x50	/* Sector erase */
#define XILINX_OP_PP		0x82	/* Page program */
#define XILINX_OP_RDSR		0xd7	/* Read status register */

#define XSR_PAGESIZE		BIT(0)	/* Page size in Po2 or Linear */
#define XSR_RDY			BIT(7)	/* Ready */

#define XILINX_RDSR_OP(buf)						\
	SPI_MEM_OP(SPI_MEM_OP_CMD(XILINX_OP_RDSR, 0),			\
		   SPI_MEM_OP_NO_ADDR,					\
		   SPI_MEM_OP_NO_DUMMY,					\
		   SPI_MEM_OP_DATA_IN(1, buf, 0))

#define S3AN_FLASH(_id, _name, _n_sectors, _page_size)		\
	.id = _id,						\
	.name = _name,						\
	.size = 8 * (_page_size) * (_n_sectors),		\
	.sector_size = (8 * (_page_size)),			\
	.page_size = (_page_size),				\
	.flags = SPI_NOR_NO_FR

/* Xilinx S3AN share MFR with Atmel SPI NOR */
static const struct flash_info xilinx_nor_parts[] = {
	/* Xilinx S3AN Internal Flash */
	{ S3AN_FLASH(SNOR_ID(0x1f, 0x22, 0x00), "3S50AN", 64, 264) },
	{ S3AN_FLASH(SNOR_ID(0x1f, 0x24, 0x00), "3S200AN", 256, 264) },
	{ S3AN_FLASH(SNOR_ID(0x1f, 0x24, 0x00), "3S400AN", 256, 264) },
	{ S3AN_FLASH(SNOR_ID(0x1f, 0x25, 0x00), "3S700AN", 512, 264) },
	{ S3AN_FLASH(SNOR_ID(0x1f, 0x26, 0x00), "3S1400AN", 512, 528) },
};

/*
 * This code converts an address to the Default Address Mode, that has non
 * power of two page sizes. We must support this mode because it is the default
 * mode supported by Xilinx tools, it can access the whole flash area and
 * changing over to the Power-of-two mode is irreversible and corrupts the
 * original data.
 * Addr can safely be unsigned int, the biggest S3AN device is smaller than
 * 4 MiB.
 */
static u32 s3an_nor_convert_addr(struct spi_nor *nor, u32 addr)
{
	u32 page_size = nor->params->page_size;
	u32 offset, page;

	offset = addr % page_size;
	page = addr / page_size;
	page <<= (page_size > 512) ? 10 : 9;

	return page | offset;
}

/**
 * xilinx_nor_read_sr() - Read the Status Register on S3AN flashes.
 * @nor:	pointer to 'struct spi_nor'.
 * @sr:		pointer to a DMA-able buffer where the value of the
 *              Status Register will be written.
 *
 * Return: 0 on success, -errno otherwise.
 */
static int xilinx_nor_read_sr(struct spi_nor *nor, u8 *sr)
{
	int ret;

	if (nor->spimem) {
		struct spi_mem_op op = XILINX_RDSR_OP(sr);

		spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);

		ret = spi_mem_exec_op(nor->spimem, &op);
	} else {
		ret = spi_nor_controller_ops_read_reg(nor, XILINX_OP_RDSR, sr,
						      1);
	}

	if (ret)
		dev_dbg(nor->dev, "error %d reading SR\n", ret);

	return ret;
}

/**
 * xilinx_nor_sr_ready() - Query the Status Register of the S3AN flash to see
 * if the flash is ready for new commands.
 * @nor:	pointer to 'struct spi_nor'.
 *
 * Return: 1 if ready, 0 if not ready, -errno on errors.
 */
static int xilinx_nor_sr_ready(struct spi_nor *nor)
{
	int ret;

	ret = xilinx_nor_read_sr(nor, nor->bouncebuf);
	if (ret)
		return ret;

	return !!(nor->bouncebuf[0] & XSR_RDY);
}

static int xilinx_nor_setup(struct spi_nor *nor,
			    const struct spi_nor_hwcaps *hwcaps)
{
	u32 page_size;
	int ret;

	ret = xilinx_nor_read_sr(nor, nor->bouncebuf);
	if (ret)
		return ret;

	nor->erase_opcode = XILINX_OP_SE;
	nor->program_opcode = XILINX_OP_PP;
	nor->read_opcode = SPINOR_OP_READ;
	nor->flags |= SNOR_F_NO_OP_CHIP_ERASE;

	/*
	 * This flashes have a page size of 264 or 528 bytes (known as
	 * Default addressing mode). It can be changed to a more standard
	 * Power of two mode where the page size is 256/512. This comes
	 * with a price: there is 3% less of space, the data is corrupted
	 * and the page size cannot be changed back to default addressing
	 * mode.
	 *
	 * The current addressing mode can be read from the XRDSR register
	 * and should not be changed, because is a destructive operation.
	 */
	if (nor->bouncebuf[0] & XSR_PAGESIZE) {
		/* Flash in Power of 2 mode */
		page_size = (nor->params->page_size == 264) ? 256 : 512;
		nor->params->page_size = page_size;
		nor->mtd.writebufsize = page_size;
		nor->params->size = nor->info->size;
		nor->mtd.erasesize = 8 * page_size;
	} else {
		/* Flash in Default addressing mode */
		nor->params->convert_addr = s3an_nor_convert_addr;
		nor->mtd.erasesize = nor->info->sector_size;
	}

	return 0;
}

static int xilinx_nor_late_init(struct spi_nor *nor)
{
	nor->params->setup = xilinx_nor_setup;
	nor->params->ready = xilinx_nor_sr_ready;

	return 0;
}

static const struct spi_nor_fixups xilinx_nor_fixups = {
	.late_init = xilinx_nor_late_init,
};

const struct spi_nor_manufacturer spi_nor_xilinx = {
	.name = "xilinx",
	.parts = xilinx_nor_parts,
	.nparts = ARRAY_SIZE(xilinx_nor_parts),
	.fixups = &xilinx_nor_fixups,
};