include/spi_flash.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Common SPI flash Interface
   4  *
   5  * Copyright (C) 2008 Atmel Corporation
   6  * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc.
   7  */
   8
   9 #ifndef _SPI_FLASH_H_
  10 #define _SPI_FLASH_H_
  11
  12 #include <dm.h> /* Because we dereference struct udevice here */
  13 #include <linux/types.h>
  14 #include <linux/mtd/spi-nor.h>
  15
  16 /* by default ENV use the same parameters than SF command */
  17 #ifndef CONFIG_ENV_SPI_BUS
  18 # define CONFIG_ENV_SPI_BUS     CONFIG_SF_DEFAULT_BUS
  19 #endif
  20 #ifndef CONFIG_ENV_SPI_CS
  21 # define CONFIG_ENV_SPI_CS      CONFIG_SF_DEFAULT_CS
  22 #endif
  23 #ifndef CONFIG_ENV_SPI_MAX_HZ
  24 # define CONFIG_ENV_SPI_MAX_HZ  CONFIG_SF_DEFAULT_SPEED
  25 #endif
  26 #ifndef CONFIG_ENV_SPI_MODE
  27 # define CONFIG_ENV_SPI_MODE    CONFIG_SF_DEFAULT_MODE
  28 #endif
  29
  30 struct spi_slave;
  31
  32 struct dm_spi_flash_ops {
  33         int (*read)(struct udevice *dev, u32 offset, size_t len, void *buf);
  34         int (*write)(struct udevice *dev, u32 offset, size_t len,
  35                      const void *buf);
  36         int (*erase)(struct udevice *dev, u32 offset, size_t len);
  37         /**
  38          * get_sw_write_prot() - Check state of software write-protect feature
  39          *
  40          * SPI flash chips can lock a region of the flash defined by a
  41          * 'protected area'. This function checks if this protected area is
  42          * defined.
  43          *
  44          * @dev:        SPI flash device
  45          * @return 0 if no region is write-protected, 1 if a region is
  46          *      write-protected, -ENOSYS if the driver does not implement this,
  47          *      other -ve value on error
  48          */
  49         int (*get_sw_write_prot)(struct udevice *dev);
  50 };
  51
  52 /* Access the serial operations for a device */
  53 #define sf_get_ops(dev) ((struct dm_spi_flash_ops *)(dev)->driver->ops)
  54
  55 #ifdef CONFIG_DM_SPI_FLASH
  56 /**
  57  * spi_flash_read_dm() - Read data from SPI flash
  58  *
  59  * @dev:        SPI flash device
  60  * @offset:     Offset into device in bytes to read from
  61  * @len:        Number of bytes to read
  62  * @buf:        Buffer to put the data that is read
  63  * @return 0 if OK, -ve on error
  64  */
  65 int spi_flash_read_dm(struct udevice *dev, u32 offset, size_t len, void *buf);
  66
  67 /**
  68  * spi_flash_write_dm() - Write data to SPI flash
  69  *
  70  * @dev:        SPI flash device
  71  * @offset:     Offset into device in bytes to write to
  72  * @len:        Number of bytes to write
  73  * @buf:        Buffer containing bytes to write
  74  * @return 0 if OK, -ve on error
  75  */
  76 int spi_flash_write_dm(struct udevice *dev, u32 offset, size_t len,
  77                        const void *buf);
  78
  79 /**
  80  * spi_flash_erase_dm() - Erase blocks of the SPI flash
  81  *
  82  * Note that @len must be a muiltiple of the flash sector size.
  83  *
  84  * @dev:        SPI flash device
  85  * @offset:     Offset into device in bytes to start erasing
  86  * @len:        Number of bytes to erase
  87  * @return 0 if OK, -ve on error
  88  */
  89 int spi_flash_erase_dm(struct udevice *dev, u32 offset, size_t len);
  90
  91 /**
  92  * spl_flash_get_sw_write_prot() - Check state of software write-protect feature
  93  *
  94  * SPI flash chips can lock a region of the flash defined by a
  95  * 'protected area'. This function checks if this protected area is
  96  * defined.
  97  *
  98  * @dev:        SPI flash device
  99  * @return 0 if no region is write-protected, 1 if a region is
 100  *      write-protected, -ENOSYS if the driver does not implement this,
 101  *      other -ve value on error
 102  */
 103 int spl_flash_get_sw_write_prot(struct udevice *dev);
 104
 105 /**
 106  * spi_flash_std_probe() - Probe a SPI flash device
 107  *
 108  * This is the standard internal method for probing a SPI flash device to
 109  * determine its type. It can be used in chip-specific drivers which need to
 110  * do this, typically with of-platdata
 111  *
 112  * @dev: SPI-flash device to probe
 113  * @return 0 if OK, -ve on error
 114  */
 115 int spi_flash_std_probe(struct udevice *dev);
 116
 117 int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
 118                            unsigned int max_hz, unsigned int spi_mode,
 119                            struct udevice **devp);
 120
 121 /* Compatibility function - this is the old U-Boot API */
 122 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 123                                   unsigned int max_hz, unsigned int spi_mode);
 124
 125 /* Compatibility function - this is the old U-Boot API */
 126 void spi_flash_free(struct spi_flash *flash);
 127
 128 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 129                                  size_t len, void *buf)
 130 {
 131         return spi_flash_read_dm(flash->dev, offset, len, buf);
 132 }
 133
 134 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 135                                   size_t len, const void *buf)
 136 {
 137         return spi_flash_write_dm(flash->dev, offset, len, buf);
 138 }
 139
 140 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 141                                   size_t len)
 142 {
 143         return spi_flash_erase_dm(flash->dev, offset, len);
 144 }
 145
 146 struct sandbox_state;
 147
 148 int sandbox_sf_bind_emul(struct sandbox_state *state, int busnum, int cs,
 149                          struct udevice *bus, ofnode node, const char *spec);
 150
 151 void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs);
 152
 153 #else
 154 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 155                 unsigned int max_hz, unsigned int spi_mode);
 156
 157 void spi_flash_free(struct spi_flash *flash);
 158
 159 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 160                 size_t len, void *buf)
 161 {
 162         struct mtd_info *mtd = &flash->mtd;
 163         size_t retlen;
 164
 165         return mtd->_read(mtd, offset, len, &retlen, buf);
 166 }
 167
 168 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 169                 size_t len, const void *buf)
 170 {
 171         struct mtd_info *mtd = &flash->mtd;
 172         size_t retlen;
 173
 174         return mtd->_write(mtd, offset, len, &retlen, buf);
 175 }
 176
 177 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 178                 size_t len)
 179 {
 180         struct mtd_info *mtd = &flash->mtd;
 181         struct erase_info instr;
 182
 183         if (offset % mtd->erasesize || len % mtd->erasesize) {
 184                 printf("SF: Erase offset/length not multiple of erase size\n");
 185                 return -EINVAL;
 186         }
 187
 188         memset(&instr, 0, sizeof(instr));
 189         instr.addr = offset;
 190         instr.len = len;
 191
 192         return mtd->_erase(mtd, &instr);
 193 }
 194 #endif
 195
 196 static inline int spi_flash_protect(struct spi_flash *flash, u32 ofs, u32 len,
 197                                         bool prot)
 198 {
 199         if (!flash->flash_lock || !flash->flash_unlock)
 200                 return -EOPNOTSUPP;
 201
 202         if (prot)
 203                 return flash->flash_lock(flash, ofs, len);
 204         else
 205                 return flash->flash_unlock(flash, ofs, len);
 206 }
 207
 208 #endif /* _SPI_FLASH_H_ */