mirror of
https://github.com/AsahiLinux/u-boot
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439fcb9b4f
commit c3c016c "sf: Add SPI NOR protection mechanism" introduced
flash_lock()/flash_unlock()/flash_is_locked() methods for SPI flash,
but not every flash driver supplies these. We should test these
methods against NULL before actually calling them.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
252 lines
7.3 KiB
C
252 lines
7.3 KiB
C
/*
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* Common SPI flash Interface
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*
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* Copyright (C) 2008 Atmel Corporation
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* Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#ifndef _SPI_FLASH_H_
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#define _SPI_FLASH_H_
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#include <dm.h> /* Because we dereference struct udevice here */
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#include <linux/types.h>
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#ifndef CONFIG_SF_DEFAULT_SPEED
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# define CONFIG_SF_DEFAULT_SPEED 1000000
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#endif
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#ifndef CONFIG_SF_DEFAULT_MODE
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# define CONFIG_SF_DEFAULT_MODE SPI_MODE_3
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#endif
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#ifndef CONFIG_SF_DEFAULT_CS
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# define CONFIG_SF_DEFAULT_CS 0
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#endif
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#ifndef CONFIG_SF_DEFAULT_BUS
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# define CONFIG_SF_DEFAULT_BUS 0
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#endif
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struct spi_slave;
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/**
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* struct spi_flash - SPI flash structure
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*
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* @spi: SPI slave
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* @dev: SPI flash device
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* @name: Name of SPI flash
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* @dual_flash: Indicates dual flash memories - dual stacked, parallel
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* @shift: Flash shift useful in dual parallel
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* @flags: Indication of spi flash flags
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* @size: Total flash size
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* @page_size: Write (page) size
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* @sector_size: Sector size
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* @erase_size: Erase size
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* @bank_read_cmd: Bank read cmd
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* @bank_write_cmd: Bank write cmd
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* @bank_curr: Current flash bank
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* @erase_cmd: Erase cmd 4K, 32K, 64K
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* @read_cmd: Read cmd - Array Fast, Extn read and quad read.
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* @write_cmd: Write cmd - page and quad program.
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* @dummy_byte: Dummy cycles for read operation.
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* @memory_map: Address of read-only SPI flash access
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* @flash_lock: lock a region of the SPI Flash
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* @flash_unlock: unlock a region of the SPI Flash
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* @flash_is_locked: check if a region of the SPI Flash is completely locked
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* @read: Flash read ops: Read len bytes at offset into buf
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* Supported cmds: Fast Array Read
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* @write: Flash write ops: Write len bytes from buf into offset
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* Supported cmds: Page Program
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* @erase: Flash erase ops: Erase len bytes from offset
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* Supported cmds: Sector erase 4K, 32K, 64K
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* return 0 - Success, 1 - Failure
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*/
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struct spi_flash {
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struct spi_slave *spi;
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#ifdef CONFIG_DM_SPI_FLASH
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struct udevice *dev;
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#endif
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const char *name;
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u8 dual_flash;
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u8 shift;
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u16 flags;
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u32 size;
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u32 page_size;
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u32 sector_size;
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u32 erase_size;
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#ifdef CONFIG_SPI_FLASH_BAR
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u8 bank_read_cmd;
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u8 bank_write_cmd;
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u8 bank_curr;
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#endif
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u8 erase_cmd;
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u8 read_cmd;
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u8 write_cmd;
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u8 dummy_byte;
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void *memory_map;
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int (*flash_lock)(struct spi_flash *flash, u32 ofs, size_t len);
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int (*flash_unlock)(struct spi_flash *flash, u32 ofs, size_t len);
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int (*flash_is_locked)(struct spi_flash *flash, u32 ofs, size_t len);
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#ifndef CONFIG_DM_SPI_FLASH
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/*
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* These are not strictly needed for driver model, but keep them here
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* while the transition is in progress.
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*
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* Normally each driver would provide its own operations, but for
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* SPI flash most chips use the same algorithms. One approach is
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* to create a 'common' SPI flash device which knows how to talk
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* to most devices, and then allow other drivers to be used instead
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* if required, perhaps with a way of scanning through the list to
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* find the driver that matches the device.
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*/
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int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);
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int (*write)(struct spi_flash *flash, u32 offset, size_t len,
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const void *buf);
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int (*erase)(struct spi_flash *flash, u32 offset, size_t len);
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#endif
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};
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struct dm_spi_flash_ops {
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int (*read)(struct udevice *dev, u32 offset, size_t len, void *buf);
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int (*write)(struct udevice *dev, u32 offset, size_t len,
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const void *buf);
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int (*erase)(struct udevice *dev, u32 offset, size_t len);
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};
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/* Access the serial operations for a device */
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#define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
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#ifdef CONFIG_DM_SPI_FLASH
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/**
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* spi_flash_read_dm() - Read data from SPI flash
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*
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* @dev: SPI flash device
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* @offset: Offset into device in bytes to read from
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* @len: Number of bytes to read
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* @buf: Buffer to put the data that is read
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* @return 0 if OK, -ve on error
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*/
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int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf);
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/**
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* spi_flash_write_dm() - Write data to SPI flash
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*
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* @dev: SPI flash device
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* @offset: Offset into device in bytes to write to
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* @len: Number of bytes to write
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* @buf: Buffer containing bytes to write
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* @return 0 if OK, -ve on error
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*/
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int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
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const void *buf);
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/**
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* spi_flash_erase_dm() - Erase blocks of the SPI flash
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*
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* Note that @len must be a muiltiple of the flash sector size.
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*
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* @dev: SPI flash device
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* @offset: Offset into device in bytes to start erasing
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* @len: Number of bytes to erase
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* @return 0 if OK, -ve on error
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*/
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int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
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int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
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unsigned int max_hz, unsigned int spi_mode,
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struct udevice **devp);
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/* Compatibility function - this is the old U-Boot API */
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struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
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unsigned int max_hz, unsigned int spi_mode);
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/* Compatibility function - this is the old U-Boot API */
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void spi_flash_free(struct spi_flash *flash);
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int spi_flash_remove(struct udevice *flash);
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static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
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size_t len, void *buf)
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{
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return spi_flash_read_dm(flash->dev, offset, len, buf);
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}
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static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
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size_t len, const void *buf)
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{
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return spi_flash_write_dm(flash->dev, offset, len, buf);
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}
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static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
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size_t len)
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{
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return spi_flash_erase_dm(flash->dev, offset, len);
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}
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struct sandbox_state;
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int sandbox_sf_bind_emul(struct sandbox_state *state, int busnum, int cs,
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struct udevice *bus, int of_offset, const char *spec);
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void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs);
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#else
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struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
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unsigned int max_hz, unsigned int spi_mode);
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/**
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* Set up a new SPI flash from an fdt node
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*
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* @param blob Device tree blob
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* @param slave_node Pointer to this SPI slave node in the device tree
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* @param spi_node Cached pointer to the SPI interface this node belongs
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* to
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* @return 0 if ok, -1 on error
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*/
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struct spi_flash *spi_flash_probe_fdt(const void *blob, int slave_node,
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int spi_node);
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void spi_flash_free(struct spi_flash *flash);
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static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
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size_t len, void *buf)
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{
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return flash->read(flash, offset, len, buf);
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}
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static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
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size_t len, const void *buf)
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{
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return flash->write(flash, offset, len, buf);
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}
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static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
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size_t len)
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{
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return flash->erase(flash, offset, len);
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}
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#endif
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static inline int spi_flash_protect(struct spi_flash *flash, u32 ofs, u32 len,
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bool prot)
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{
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if (!flash->flash_lock || !flash->flash_unlock)
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return -EOPNOTSUPP;
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if (prot)
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return flash->flash_lock(flash, ofs, len);
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else
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return flash->flash_unlock(flash, ofs, len);
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}
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void spi_boot(void) __noreturn;
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void spi_spl_load_image(uint32_t offs, unsigned int size, void *vdst);
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#endif /* _SPI_FLASH_H_ */
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