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
|
/*
* Interface to SPI flash
*
* Copyright (C) 2008 Atmel Corporation
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*/
#ifndef _SPI_FLASH_H_
#define _SPI_FLASH_H_
#include <spi.h>
#include <linux/types.h>
#include <linux/compiler.h>
struct spi_flash {
struct spi_slave *spi;
const char *name;
/* Total flash size */
u32 size;
/* Write (page) size */
u32 page_size;
/* Erase (sector) size */
u32 sector_size;
#ifdef CONFIG_SPI_FLASH_BAR
/* Bank read cmd */
u8 bank_read_cmd;
/* Bank write cmd */
u8 bank_write_cmd;
/* Current flash bank */
u8 bank_curr;
#endif
/* Poll cmd - for flash erase/program */
u8 poll_cmd;
void *memory_map; /* Address of read-only SPI flash access */
int (*read)(struct spi_flash *flash, u32 offset,
size_t len, void *buf);
int (*write)(struct spi_flash *flash, u32 offset,
size_t len, const void *buf);
int (*erase)(struct spi_flash *flash, u32 offset,
size_t len);
};
/**
* spi_flash_do_alloc - Allocate a new spi flash structure
*
* The structure is allocated and cleared with default values for
* read, write and erase, which the caller can modify. The caller must set
* up size, page_size and sector_size.
*
* Use the helper macro spi_flash_alloc() to call this.
*
* @offset: Offset of struct spi_slave within slave structure
* @size: Size of slave structure
* @spi: SPI slave
* @name: Name of SPI flash device
*/
void *spi_flash_do_alloc(int offset, int size, struct spi_slave *spi,
const char *name);
/**
* spi_flash_alloc - Allocate a new SPI flash structure
*
* @_struct: Name of structure to allocate (e.g. struct ramtron_spi_fram). This
* structure must contain a member 'struct spi_flash *flash'.
* @spi: SPI slave
* @name: Name of SPI flash device
*/
#define spi_flash_alloc(_struct, spi, name) \
spi_flash_do_alloc(offsetof(_struct, flash), sizeof(_struct), \
spi, name)
/**
* spi_flash_alloc_base - Allocate a new SPI flash structure with no private data
*
* @spi: SPI slave
* @name: Name of SPI flash device
*/
#define spi_flash_alloc_base(spi, name) \
spi_flash_do_alloc(0, sizeof(struct spi_flash), spi, name)
struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int spi_mode);
void spi_flash_free(struct spi_flash *flash);
static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
size_t len, void *buf)
{
return flash->read(flash, offset, len, buf);
}
static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
size_t len, const void *buf)
{
return flash->write(flash, offset, len, buf);
}
static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
size_t len)
{
return flash->erase(flash, offset, len);
}
void spi_boot(void) __noreturn;
#endif /* _SPI_FLASH_H_ */
|
