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  * SPDX-License-Identifier:     GPL-2.0
   8  */
   9
  10 #ifndef _SPI_FLASH_H_
  11 #define _SPI_FLASH_H_
  12
  13 #include <dm.h> /* Because we dereference struct udevice here */
  14 #include <linux/types.h>
  15
  16 #ifndef CONFIG_SF_DEFAULT_SPEED
  17 # define CONFIG_SF_DEFAULT_SPEED        1000000
  18 #endif
  19 #ifndef CONFIG_SF_DEFAULT_MODE
  20 # define CONFIG_SF_DEFAULT_MODE         SPI_MODE_3
  21 #endif
  22 #ifndef CONFIG_SF_DEFAULT_CS
  23 # define CONFIG_SF_DEFAULT_CS           0
  24 #endif
  25 #ifndef CONFIG_SF_DEFAULT_BUS
  26 # define CONFIG_SF_DEFAULT_BUS          0
  27 #endif
  28
  29 struct spi_slave;
  30
  31 /**
  32  * struct spi_flash - SPI flash structure
  33  *
  34  * @spi:                SPI slave
  35  * @dev:                SPI flash device
  36  * @name:               Name of SPI flash
  37  * @dual_flash:         Indicates dual flash memories - dual stacked, parallel
  38  * @shift:              Flash shift useful in dual parallel
  39  * @flags:              Indication of spi flash flags
  40  * @size:               Total flash size
  41  * @page_size:          Write (page) size
  42  * @sector_size:        Sector size
  43  * @erase_size:         Erase size
  44  * @bank_read_cmd:      Bank read cmd
  45  * @bank_write_cmd:     Bank write cmd
  46  * @bank_curr:          Current flash bank
  47  * @erase_cmd:          Erase cmd 4K, 32K, 64K
  48  * @read_cmd:           Read cmd - Array Fast, Extn read and quad read.
  49  * @write_cmd:          Write cmd - page and quad program.
  50  * @dummy_byte:         Dummy cycles for read operation.
  51  * @memory_map:         Address of read-only SPI flash access
  52  * @flash_lock:         lock a region of the SPI Flash
  53  * @flash_unlock:       unlock a region of the SPI Flash
  54  * @flash_is_locked:    check if a region of the SPI Flash is completely locked
  55  * @read:               Flash read ops: Read len bytes at offset into buf
  56  *                      Supported cmds: Fast Array Read
  57  * @write:              Flash write ops: Write len bytes from buf into offset
  58  *                      Supported cmds: Page Program
  59  * @erase:              Flash erase ops: Erase len bytes from offset
  60  *                      Supported cmds: Sector erase 4K, 32K, 64K
  61  * return 0 - Success, 1 - Failure
  62  */
  63 struct spi_flash {
  64         struct spi_slave *spi;
  65 #ifdef CONFIG_DM_SPI_FLASH
  66         struct udevice *dev;
  67 #endif
  68         const char *name;
  69         u8 dual_flash;
  70         u8 shift;
  71         u16 flags;
  72
  73         u32 size;
  74         u32 page_size;
  75         u32 sector_size;
  76         u32 erase_size;
  77 #ifdef CONFIG_SPI_FLASH_BAR
  78         u8 bank_read_cmd;
  79         u8 bank_write_cmd;
  80         u8 bank_curr;
  81 #endif
  82         u8 erase_cmd;
  83         u8 read_cmd;
  84         u8 write_cmd;
  85         u8 dummy_byte;
  86
  87         void *memory_map;
  88
  89         int (*flash_lock)(struct spi_flash *flash, u32 ofs, size_t len);
  90         int (*flash_unlock)(struct spi_flash *flash, u32 ofs, size_t len);
  91         int (*flash_is_locked)(struct spi_flash *flash, u32 ofs, size_t len);
  92 #ifndef CONFIG_DM_SPI_FLASH
  93         /*
  94          * These are not strictly needed for driver model, but keep them here
  95          * while the transition is in progress.
  96          *
  97          * Normally each driver would provide its own operations, but for
  98          * SPI flash most chips use the same algorithms. One approach is
  99          * to create a 'common' SPI flash device which knows how to talk
 100          * to most devices, and then allow other drivers to be used instead
 101          * if required, perhaps with a way of scanning through the list to
 102          * find the driver that matches the device.
 103          */
 104         int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);
 105         int (*write)(struct spi_flash *flash, u32 offset, size_t len,
 106                         const void *buf);
 107         int (*erase)(struct spi_flash *flash, u32 offset, size_t len);
 108 #endif
 109 };
 110
 111 struct dm_spi_flash_ops {
 112         int (*read)(struct udevice *dev, u32 offset, size_t len, void *buf);
 113         int (*write)(struct udevice *dev, u32 offset, size_t len,
 114                      const void *buf);
 115         int (*erase)(struct udevice *dev, u32 offset, size_t len);
 116 };
 117
 118 /* Access the serial operations for a device */
 119 #define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
 120
 121 #ifdef CONFIG_DM_SPI_FLASH
 122 /**
 123  * spi_flash_read_dm() - Read data from SPI flash
 124  *
 125  * @dev:        SPI flash device
 126  * @offset:     Offset into device in bytes to read from
 127  * @len:        Number of bytes to read
 128  * @buf:        Buffer to put the data that is read
 129  * @return 0 if OK, -ve on error
 130  */
 131 int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf);
 132
 133 /**
 134  * spi_flash_write_dm() - Write data to SPI flash
 135  *
 136  * @dev:        SPI flash device
 137  * @offset:     Offset into device in bytes to write to
 138  * @len:        Number of bytes to write
 139  * @buf:        Buffer containing bytes to write
 140  * @return 0 if OK, -ve on error
 141  */
 142 int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
 143                        const void *buf);
 144
 145 /**
 146  * spi_flash_erase_dm() - Erase blocks of the SPI flash
 147  *
 148  * Note that @len must be a muiltiple of the flash sector size.
 149  *
 150  * @dev:        SPI flash device
 151  * @offset:     Offset into device in bytes to start erasing
 152  * @len:        Number of bytes to erase
 153  * @return 0 if OK, -ve on error
 154  */
 155 int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
 156
 157 int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
 158                            unsigned int max_hz, unsigned int spi_mode,
 159                            struct udevice **devp);
 160
 161 /* Compatibility function - this is the old U-Boot API */
 162 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 163                                   unsigned int max_hz, unsigned int spi_mode);
 164
 165 /* Compatibility function - this is the old U-Boot API */
 166 void spi_flash_free(struct spi_flash *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 void spi_flash_free(struct spi_flash *flash);
 198
 199 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 200                 size_t len, void *buf)
 201 {
 202         return flash->read(flash, offset, len, buf);
 203 }
 204
 205 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 206                 size_t len, const void *buf)
 207 {
 208         return flash->write(flash, offset, len, buf);
 209 }
 210
 211 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 212                 size_t len)
 213 {
 214         return flash->erase(flash, offset, len);
 215 }
 216 #endif
 217
 218 static inline int spi_flash_protect(struct spi_flash *flash, u32 ofs, u32 len,
 219                                         bool prot)
 220 {
 221         if (!flash->flash_lock || !flash->flash_unlock)
 222                 return -EOPNOTSUPP;
 223
 224         if (prot)
 225                 return flash->flash_lock(flash, ofs, len);
 226         else
 227                 return flash->flash_unlock(flash, ofs, len);
 228 }
 229
 230 #endif /* _SPI_FLASH_H_ */