diff options
| author | Simon Glass | 2019-10-20 21:31:47 -0600 |
|---|---|---|
| committer | Bin Meng | 2019-11-03 07:20:26 +0800 |
| commit | c53b318e1bad2e0d5c2b846fadfc79ec77bfc5f7 (patch) | |
| tree | 9fb3cf72abed73813d8a9885b59d4a66b7503b1b /include/spi.h | |
| parent | e1500a6ce29a8424cc0c0a2fa82e694419941dd1 (diff) | |
spi: Add support for memory-mapped flash
On x86 platforms the SPI flash can be mapped into memory so that the
contents can be read with normal memory accesses.
Add a new SPI method to find the location of the SPI flash in memory. This
differs from the existing device-tree "memory-map" mechanism in that the
location can be discovered at run-time.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'include/spi.h')
| -rw-r--r-- | include/spi.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/spi.h b/include/spi.h index 3f79168df30..6fbb4336ce3 100644 --- a/include/spi.h +++ b/include/spi.h @@ -462,6 +462,19 @@ struct dm_spi_ops { * is invalid, other -ve value on error */ int (*cs_info)(struct udevice *bus, uint cs, struct spi_cs_info *info); + + /** + * get_mmap() - Get memory-mapped SPI + * + * @dev: The SPI flash slave device + * @map_basep: Returns base memory address for mapped SPI + * @map_sizep: Returns size of mapped SPI + * @offsetp: Returns start offset of SPI flash where the map works + * correctly (offsets before this are not visible) + * @return 0 if OK, -EFAULT if memory mapping is not available + */ + int (*get_mmap)(struct udevice *dev, ulong *map_basep, + uint *map_sizep, uint *offsetp); }; struct dm_spi_emul_ops { @@ -650,6 +663,20 @@ void dm_spi_release_bus(struct udevice *dev); int dm_spi_xfer(struct udevice *dev, unsigned int bitlen, const void *dout, void *din, unsigned long flags); +/** + * spi_get_mmap() - Get memory-mapped SPI + * + * @dev: SPI slave device to check + * @map_basep: Returns base memory address for mapped SPI + * @map_sizep: Returns size of mapped SPI + * @offsetp: Returns start offset of SPI flash where the map works + * correctly (offsets before this are not visible) + * @return 0 if OK, -ENOSYS if no operation, -EFAULT if memory mapping is not + * available + */ +int dm_spi_get_mmap(struct udevice *dev, ulong *map_basep, uint *map_sizep, + uint *offsetp); + /* Access the operations for a SPI device */ #define spi_get_ops(dev) ((struct dm_spi_ops *)(dev)->driver->ops) #define spi_emul_get_ops(dev) ((struct dm_spi_emul_ops *)(dev)->driver->ops) |