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  * @dev:                SPI flash device
  41  * @name:               Name of SPI flash
  42  * @dual_flash:         Indicates dual flash memories - dual stacked, parallel
  43  * @shift:              Flash shift useful in dual parallel
  44  * @flags:              Indication of spi flash flags
  45  * @size:               Total flash size
  46  * @page_size:          Write (page) size
  47  * @sector_size:        Sector size
  48  * @erase_size:         Erase size
  49  * @bank_read_cmd:      Bank read cmd
  50  * @bank_write_cmd:     Bank write cmd
  51  * @bank_curr:          Current flash bank
  52  * @erase_cmd:          Erase cmd 4K, 32K, 64K
  53  * @read_cmd:           Read cmd - Array Fast, Extn read and quad read.
  54  * @write_cmd:          Write cmd - page and quad program.
  55  * @dummy_byte:         Dummy cycles for read operation.
  56  * @memory_map:         Address of read-only SPI flash access
  57  * @flash_lock:         lock a region of the SPI Flash
  58  * @flash_unlock:       unlock a region of the SPI Flash
  59  * @flash_is_locked:    check if a region of the SPI Flash is completely locked
  60  * @read:               Flash read ops: Read len bytes at offset into buf
  61  *                      Supported cmds: Fast Array Read
  62  * @write:              Flash write ops: Write len bytes from buf into offset
  63  *                      Supported cmds: Page Program
  64  * @erase:              Flash erase ops: Erase len bytes from offset
  65  *                      Supported cmds: Sector erase 4K, 32K, 64K
  66  * return 0 - Success, 1 - Failure
  67  */
  68 struct spi_flash {
  69         struct spi_slave *spi;
  70 #ifdef CONFIG_DM_SPI_FLASH
  71         struct udevice *dev;
  72 #endif
  73         const char *name;
  74         u8 dual_flash;
  75         u8 shift;
  76         u16 flags;
  77
  78         u32 size;
  79         u32 page_size;
  80         u32 sector_size;
  81         u32 erase_size;
  82 #ifdef CONFIG_SPI_FLASH_BAR
  83         u8 bank_read_cmd;
  84         u8 bank_write_cmd;
  85         u8 bank_curr;
  86 #endif
  87         u8 erase_cmd;
  88         u8 read_cmd;
  89         u8 write_cmd;
  90         u8 dummy_byte;
  91
  92         void *memory_map;
  93
  94         int (*flash_lock)(struct spi_flash *flash, u32 ofs, size_t len);
  95         int (*flash_unlock)(struct spi_flash *flash, u32 ofs, size_t len);
  96         int (*flash_is_locked)(struct spi_flash *flash, u32 ofs, size_t len);
  97 #ifndef CONFIG_DM_SPI_FLASH
  98         /*
  99          * These are not strictly needed for driver model, but keep them here
 100          * while the transition is in progress.
 101          *
 102          * Normally each driver would provide its own operations, but for
 103          * SPI flash most chips use the same algorithms. One approach is
 104          * to create a 'common' SPI flash device which knows how to talk
 105          * to most devices, and then allow other drivers to be used instead
 106          * if required, perhaps with a way of scanning through the list to
 107          * find the driver that matches the device.
 108          */
 109         int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);
 110         int (*write)(struct spi_flash *flash, u32 offset, size_t len,
 111                         const void *buf);
 112         int (*erase)(struct spi_flash *flash, u32 offset, size_t len);
 113 #endif
 114 };
 115
 116 struct dm_spi_flash_ops {
 117         int (*read)(struct udevice *dev, u32 offset, size_t len, void *buf);
 118         int (*write)(struct udevice *dev, u32 offset, size_t len,
 119                      const void *buf);
 120         int (*erase)(struct udevice *dev, u32 offset, size_t len);
 121 };
 122
 123 /* Access the serial operations for a device */
 124 #define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
 125
 126 #ifdef CONFIG_DM_SPI_FLASH
 127 /**
 128  * spi_flash_read_dm() - Read data from SPI flash
 129  *
 130  * @dev:        SPI flash device
 131  * @offset:     Offset into device in bytes to read from
 132  * @len:        Number of bytes to read
 133  * @buf:        Buffer to put the data that is read
 134  * @return 0 if OK, -ve on error
 135  */
 136 int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf);
 137
 138 /**
 139  * spi_flash_write_dm() - Write data to SPI flash
 140  *
 141  * @dev:        SPI flash device
 142  * @offset:     Offset into device in bytes to write to
 143  * @len:        Number of bytes to write
 144  * @buf:        Buffer containing bytes to write
 145  * @return 0 if OK, -ve on error
 146  */
 147 int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
 148                        const void *buf);
 149
 150 /**
 151  * spi_flash_erase_dm() - Erase blocks of the SPI flash
 152  *
 153  * Note that @len must be a muiltiple of the flash sector size.
 154  *
 155  * @dev:        SPI flash device
 156  * @offset:     Offset into device in bytes to start erasing
 157  * @len:        Number of bytes to erase
 158  * @return 0 if OK, -ve on error
 159  */
 160 int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
 161
 162 int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
 163                            unsigned int max_hz, unsigned int spi_mode,
 164                            struct udevice **devp);
 165
 166 /* Compatibility function - this is the old U-Boot API */
 167 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 168                                   unsigned int max_hz, unsigned int spi_mode);
 169
 170 /* Compatibility function - this is the old U-Boot API */
 171 void spi_flash_free(struct spi_flash *flash);
 172
 173 int spi_flash_remove(struct udevice *flash);
 174
 175 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 176                                  size_t len, void *buf)
 177 {
 178         return spi_flash_read_dm(flash->dev, offset, len, buf);
 179 }
 180
 181 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 182                                   size_t len, const void *buf)
 183 {
 184         return spi_flash_write_dm(flash->dev, offset, len, buf);
 185 }
 186
 187 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 188                                   size_t len)
 189 {
 190         return spi_flash_erase_dm(flash->dev, offset, len);
 191 }
 192
 193 struct sandbox_state;
 194
 195 int sandbox_sf_bind_emul(struct sandbox_state *state, int busnum, int cs,
 196                          struct udevice *bus, int of_offset, const char *spec);
 197
 198 void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs);
 199
 200 #else
 201 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 202                 unsigned int max_hz, unsigned int spi_mode);
 203
 204 /**
 205  * Set up a new SPI flash from an fdt node
 206  *
 207  * @param blob          Device tree blob
 208  * @param slave_node    Pointer to this SPI slave node in the device tree
 209  * @param spi_node      Cached pointer to the SPI interface this node belongs
 210  *                      to
 211  * @return 0 if ok, -1 on error
 212  */
 213 struct spi_flash *spi_flash_probe_fdt(const void *blob, int slave_node,
 214                                       int spi_node);
 215
 216 void spi_flash_free(struct spi_flash *flash);
 217
 218 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 219                 size_t len, void *buf)
 220 {
 221         return flash->read(flash, offset, len, buf);
 222 }
 223
 224 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 225                 size_t len, const void *buf)
 226 {
 227         return flash->write(flash, offset, len, buf);
 228 }
 229
 230 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 231                 size_t len)
 232 {
 233         return flash->erase(flash, offset, len);
 234 }
 235 #endif
 236
 237 static inline int spi_flash_protect(struct spi_flash *flash, u32 ofs, u32 len,
 238                                         bool prot)
 239 {
 240         if (!flash->flash_lock || !flash->flash_unlock)
 241                 return -EOPNOTSUPP;
 242
 243         if (prot)
 244                 return flash->flash_lock(flash, ofs, len);
 245         else
 246                 return flash->flash_unlock(flash, ofs, len);
 247 }
 248
 249 void spi_boot(void) __noreturn;
 250 void spi_spl_load_image(uint32_t offs, unsigned int size, void *vdst);
 251
 252 #endif /* _SPI_FLASH_H_ */