diff options
author | Mario Six <mario.six@gdsys.cc> | 2018-08-09 14:51:16 +0200 |
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committer | Anatolij Gustschin <agust@denx.de> | 2018-08-11 08:07:36 +0200 |
commit | a63e54ab5fea8aa15c561dd29bd10edfccc1609c (patch) | |
tree | 9461d3c18d87303508de348aa26d4a270a69d205 /include/axi.h | |
parent | f05ebbf47a9dc863ff4bb084649ecb34d728b5f2 (diff) | |
download | u-boot-a63e54ab5fea8aa15c561dd29bd10edfccc1609c.tar.gz |
drivers: Add AXI uclass
Add a uclass for AXI (Advanced eXtensible Interface) busses, and a
driver for the gdsys IHS AXI bus on IHS FPGAs.
Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/axi.h')
-rw-r--r-- | include/axi.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/include/axi.h b/include/axi.h new file mode 100644 index 0000000000..2ff81c16af --- /dev/null +++ b/include/axi.h @@ -0,0 +1,78 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * (C) Copyright 2017 + * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc + */ + +#ifndef _AXI_H_ +#define _AXI_H_ + +enum axi_size_t { + AXI_SIZE_8, + AXI_SIZE_16, + AXI_SIZE_32, +}; + +/** + * struct axi_ops - driver operations for AXI uclass + * + * Drivers should support these operations unless otherwise noted. These + * operations are intended to be used by uclass code, not directly from + * other code. + */ +struct axi_ops { + /** + * read() - Read a single value from a specified address on a AXI bus + * + * @dev: AXI bus to read from. + * @address: The address to read from. + * @data: Pointer to a variable that takes the data value read + * from the address on the AXI bus. + * @size: The size of the data to be read. + * @return 0 if OK, -ve on error. + */ + int (*read)(struct udevice *dev, ulong address, void *data, + enum axi_size_t size); + + /** + * write() - Write a single value to a specified address on a AXI bus + * + * @dev: AXI bus to write to. + * @address: The address to write to. + * @data: Pointer to the data value to be written to the address + * on the AXI bus. + * @size: The size of the data to write. + * @return 0 if OK, -ve on error. + */ + int (*write)(struct udevice *dev, ulong address, void *data, + enum axi_size_t size); +}; + +#define axi_get_ops(dev) ((struct axi_ops *)(dev)->driver->ops) + +/** + * axi_read() - Read a single value from a specified address on a AXI bus + * + * @dev: AXI bus to read from. + * @address: The address to read from. + * @data: Pointer to a variable that takes the data value read from the + * address on the AXI bus. + * @size: The size of the data to write. + * @return 0 if OK, -ve on error. + */ +int axi_read(struct udevice *dev, ulong address, void *data, + enum axi_size_t size); + +/** + * axi_write() - Write a single value to a specified address on a AXI bus + * + * @dev: AXI bus to write to. + * @address: The address to write to. + * @data: Pointer to the data value to be written to the address on the + * AXI bus. + * @size: The size of the data to write. + * @return 0 if OK, -ve on error. + */ +int axi_write(struct udevice *dev, ulong address, void *data, + enum axi_size_t size); +#endif |