1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Common SPI flash Interface
5 * Copyright (C) 2008 Atmel Corporation
6 * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc.
12 #include <dm.h> /* Because we dereference struct udevice here */
13 #include <linux/types.h>
14 #include <linux/mtd/spi-nor.h>
16 #ifndef CONFIG_SF_DEFAULT_SPEED
17 # define CONFIG_SF_DEFAULT_SPEED 1000000
19 #ifndef CONFIG_SF_DEFAULT_MODE
20 # define CONFIG_SF_DEFAULT_MODE SPI_MODE_3
22 #ifndef CONFIG_SF_DEFAULT_CS
23 # define CONFIG_SF_DEFAULT_CS 0
25 #ifndef CONFIG_SF_DEFAULT_BUS
26 # define CONFIG_SF_DEFAULT_BUS 0
31 struct dm_spi_flash_ops {
32 int (*read)(struct udevice *dev, u32 offset, size_t len, void *buf);
33 int (*write)(struct udevice *dev, u32 offset, size_t len,
35 int (*erase)(struct udevice *dev, u32 offset, size_t len);
37 * get_sw_write_prot() - Check state of software write-protect feature
39 * SPI flash chips can lock a region of the flash defined by a
40 * 'protected area'. This function checks if this protected area is
43 * @dev: SPI flash device
44 * @return 0 if no region is write-protected, 1 if a region is
45 * write-protected, -ENOSYS if the driver does not implement this,
46 * other -ve value on error
48 int (*get_sw_write_prot)(struct udevice *dev);
51 /* Access the serial operations for a device */
52 #define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
54 #ifdef CONFIG_DM_SPI_FLASH
56 * spi_flash_read_dm() - Read data from SPI flash
58 * @dev: SPI flash device
59 * @offset: Offset into device in bytes to read from
60 * @len: Number of bytes to read
61 * @buf: Buffer to put the data that is read
62 * @return 0 if OK, -ve on error
64 int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf);
67 * spi_flash_write_dm() - Write data to SPI flash
69 * @dev: SPI flash device
70 * @offset: Offset into device in bytes to write to
71 * @len: Number of bytes to write
72 * @buf: Buffer containing bytes to write
73 * @return 0 if OK, -ve on error
75 int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
79 * spi_flash_erase_dm() - Erase blocks of the SPI flash
81 * Note that @len must be a muiltiple of the flash sector size.
83 * @dev: SPI flash device
84 * @offset: Offset into device in bytes to start erasing
85 * @len: Number of bytes to erase
86 * @return 0 if OK, -ve on error
88 int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
91 * spl_flash_get_sw_write_prot() - Check state of software write-protect feature
93 * SPI flash chips can lock a region of the flash defined by a
94 * 'protected area'. This function checks if this protected area is
97 * @dev: SPI flash device
98 * @return 0 if no region is write-protected, 1 if a region is
99 * write-protected, -ENOSYS if the driver does not implement this,
100 * other -ve value on error
102 int spl_flash_get_sw_write_prot(struct udevice *dev);
104 int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
105 unsigned int max_hz, unsigned int spi_mode,
106 struct udevice **devp);
108 /* Compatibility function - this is the old U-Boot API */
109 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
110 unsigned int max_hz, unsigned int spi_mode);
112 /* Compatibility function - this is the old U-Boot API */
113 void spi_flash_free(struct spi_flash *flash);
115 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
116 size_t len, void *buf)
118 return spi_flash_read_dm(flash->dev, offset, len, buf);
121 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
122 size_t len, const void *buf)
124 return spi_flash_write_dm(flash->dev, offset, len, buf);
127 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
130 return spi_flash_erase_dm(flash->dev, offset, len);
133 struct sandbox_state;
135 int sandbox_sf_bind_emul(struct sandbox_state *state, int busnum, int cs,
136 struct udevice *bus, ofnode node, const char *spec);
138 void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs);
141 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
142 unsigned int max_hz, unsigned int spi_mode);
144 void spi_flash_free(struct spi_flash *flash);
146 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
147 size_t len, void *buf)
149 struct mtd_info *mtd = &flash->mtd;
152 return mtd->_read(mtd, offset, len, &retlen, buf);
155 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
156 size_t len, const void *buf)
158 struct mtd_info *mtd = &flash->mtd;
161 return mtd->_write(mtd, offset, len, &retlen, buf);
164 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
167 struct mtd_info *mtd = &flash->mtd;
168 struct erase_info instr;
170 if (offset % mtd->erasesize || len % mtd->erasesize) {
171 printf("SF: Erase offset/length not multiple of erase size\n");
175 memset(&instr, 0, sizeof(instr));
179 return mtd->_erase(mtd, &instr);
183 static inline int spi_flash_protect(struct spi_flash *flash, u32 ofs, u32 len,
186 if (!flash->flash_lock || !flash->flash_unlock)
190 return flash->flash_lock(flash, ofs, len);
192 return flash->flash_unlock(flash, ofs, len);
195 #endif /* _SPI_FLASH_H_ */