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spi: Add support for memory-mapped flash

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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>
This commit is contained in:
Simon Glass
2019-10-20 21:31:47 -06:00
committed by Bin Meng
parent e1500a6ce2
commit c53b318e1b
4 changed files with 61 additions and 0 deletions
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27
include/spi.h
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@@ -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)