include/spi_flash.h

   1 /*
   2  * Common SPI flash Interface
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   5  * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc.
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  */
  14
  15 #ifndef _SPI_FLASH_H_
  16 #define _SPI_FLASH_H_
  17
  18 #include <dm.h> /* Because we dereference struct udevice here */
  19 #include <linux/types.h>
  20
  21 #ifndef CONFIG_SF_DEFAULT_SPEED
  22 # define CONFIG_SF_DEFAULT_SPEED        1000000
  23 #endif
  24 #ifndef CONFIG_SF_DEFAULT_MODE
  25 # define CONFIG_SF_DEFAULT_MODE         SPI_MODE_3
  26 #endif
  27 #ifndef CONFIG_SF_DEFAULT_CS
  28 # define CONFIG_SF_DEFAULT_CS           0
  29 #endif
  30 #ifndef CONFIG_SF_DEFAULT_BUS
  31 # define CONFIG_SF_DEFAULT_BUS          0
  32 #endif
  33
  34 struct spi_slave;
  35
  36 /**
  37  * struct spi_flash - SPI flash structure
  38  *
  39  * @spi:                SPI slave
  40  * @name:               Name of SPI flash
  41  * @dual_flash: Indicates dual flash memories - dual stacked, parallel
  42  * @shift:              Flash shift useful in dual parallel
  43  * @size:               Total flash size
  44  * @page_size:          Write (page) size
  45  * @sector_size:        Sector size
  46  * @erase_size: Erase size
  47  * @bank_read_cmd:      Bank read cmd
  48  * @bank_write_cmd:     Bank write cmd
  49  * @bank_curr:          Current flash bank
  50  * @poll_cmd:           Poll cmd - for flash erase/program
  51  * @erase_cmd:          Erase cmd 4K, 32K, 64K
  52  * @read_cmd:           Read cmd - Array Fast, Extn read and quad read.
  53  * @write_cmd:          Write cmd - page and quad program.
  54  * @dummy_byte: Dummy cycles for read operation.
  55  * @memory_map: Address of read-only SPI flash access
  56  * @read:               Flash read ops: Read len bytes at offset into buf
  57  *                      Supported cmds: Fast Array Read
  58  * @write:              Flash write ops: Write len bytes from buf into offset
  59  *                      Supported cmds: Page Program
  60  * @erase:              Flash erase ops: Erase len bytes from offset
  61  *                      Supported cmds: Sector erase 4K, 32K, 64K
  62  * return 0 - Success, 1 - Failure
  63  */
  64 struct spi_flash {
  65         struct spi_slave *spi;
  66 #ifdef CONFIG_DM_SPI_FLASH
  67         struct udevice *dev;
  68         u16 flags;
  69 #endif
  70         const char *name;
  71         u8 dual_flash;
  72         u8 shift;
  73
  74         u32 size;
  75         u32 page_size;
  76         u32 sector_size;
  77         u32 erase_size;
  78 #ifdef CONFIG_SPI_FLASH_BAR
  79         u8 bank_read_cmd;
  80         u8 bank_write_cmd;
  81         u8 bank_curr;
  82 #endif
  83         u8 poll_cmd;
  84         u8 erase_cmd;
  85         u8 read_cmd;
  86         u8 write_cmd;
  87         u8 dummy_byte;
  88
  89         void *memory_map;
  90 #ifndef CONFIG_DM_SPI_FLASH
  91         /*
  92          * These are not strictly needed for driver model, but keep them here
  93          * while the transition is in progress.
  94          *
  95          * Normally each driver would provide its own operations, but for
  96          * SPI flash most chips use the same algorithms. One approach is
  97          * to create a 'common' SPI flash device which knows how to talk
  98          * to most devices, and then allow other drivers to be used instead
  99          * if required, perhaps with a way of scanning through the list to
 100          * find the driver that matches the device.
 101          */
 102         int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);
 103         int (*write)(struct spi_flash *flash, u32 offset, size_t len,
 104                         const void *buf);
 105         int (*erase)(struct spi_flash *flash, u32 offset, size_t len);
 106 #endif
 107 };
 108
 109 struct dm_spi_flash_ops {
 110         int (*read)(struct udevice *dev, u32 offset, size_t len, void *buf);
 111         int (*write)(struct udevice *dev, u32 offset, size_t len,
 112                      const void *buf);
 113         int (*erase)(struct udevice *dev, u32 offset, size_t len);
 114 };
 115
 116 /* Access the serial operations for a device */
 117 #define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
 118
 119 #ifdef CONFIG_DM_SPI_FLASH
 120 /**
 121  * spi_flash_read_dm() - Read data from SPI flash
 122  *
 123  * @dev:        SPI flash device
 124  * @offset:     Offset into device in bytes to read from
 125  * @len:        Number of bytes to read
 126  * @buf:        Buffer to put the data that is read
 127  * @return 0 if OK, -ve on error
 128  */
 129 int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf);
 130
 131 /**
 132  * spi_flash_write_dm() - Write data to SPI flash
 133  *
 134  * @dev:        SPI flash device
 135  * @offset:     Offset into device in bytes to write to
 136  * @len:        Number of bytes to write
 137  * @buf:        Buffer containing bytes to write
 138  * @return 0 if OK, -ve on error
 139  */
 140 int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
 141                        const void *buf);
 142
 143 /**
 144  * spi_flash_erase_dm() - Erase blocks of the SPI flash
 145  *
 146  * Note that @len must be a muiltiple of the flash sector size.
 147  *
 148  * @dev:        SPI flash device
 149  * @offset:     Offset into device in bytes to start erasing
 150  * @len:        Number of bytes to erase
 151  * @return 0 if OK, -ve on error
 152  */
 153 int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
 154
 155 int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
 156                            unsigned int max_hz, unsigned int spi_mode,
 157                            struct udevice **devp);
 158
 159 /* Compatibility function - this is the old U-Boot API */
 160 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 161                                   unsigned int max_hz, unsigned int spi_mode);
 162
 163 /* Compatibility function - this is the old U-Boot API */
 164 void spi_flash_free(struct spi_flash *flash);
 165
 166 int spi_flash_remove(struct udevice *flash);
 167
 168 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 169                                  size_t len, void *buf)
 170 {
 171         return spi_flash_read_dm(flash->dev, offset, len, buf);
 172 }
 173
 174 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 175                                   size_t len, const void *buf)
 176 {
 177         return spi_flash_write_dm(flash->dev, offset, len, buf);
 178 }
 179
 180 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 181                                   size_t len)
 182 {
 183         return spi_flash_erase_dm(flash->dev, offset, len);
 184 }
 185
 186 struct sandbox_state;
 187
 188 int sandbox_sf_bind_emul(struct sandbox_state *state, int busnum, int cs,
 189                          struct udevice *bus, int of_offset, const char *spec);
 190
 191 void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs);
 192
 193 #else
 194 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 195                 unsigned int max_hz, unsigned int spi_mode);
 196
 197 /**
 198  * Set up a new SPI flash from an fdt node
 199  *
 200  * @param blob          Device tree blob
 201  * @param slave_node    Pointer to this SPI slave node in the device tree
 202  * @param spi_node      Cached pointer to the SPI interface this node belongs
 203  *                      to
 204  * @return 0 if ok, -1 on error
 205  */
 206 struct spi_flash *spi_flash_probe_fdt(const void *blob, int slave_node,
 207                                       int spi_node);
 208
 209 void spi_flash_free(struct spi_flash *flash);
 210
 211 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 212                 size_t len, void *buf)
 213 {
 214         return flash->read(flash, offset, len, buf);
 215 }
 216
 217 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 218                 size_t len, const void *buf)
 219 {
 220         return flash->write(flash, offset, len, buf);
 221 }
 222
 223 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 224                 size_t len)
 225 {
 226         return flash->erase(flash, offset, len);
 227 }
 228 #endif
 229
 230 void spi_boot(void) __noreturn;
 231 void spi_spl_load_image(uint32_t offs, unsigned int size, void *vdst);
 232
 233 #endif /* _SPI_FLASH_H_ */