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....@gdsys.cc>
---
v1 -> v2:
* Spelled out all abbreviations in the Kconfig help
* Split commit into uclass addition and driver addition
---
drivers/Kconfig | 2 ++
drivers/Makefile | 1 +
drivers/axi/Kconfig | 13 +++++++++
drivers/axi/Makefile | 8 ++++++
drivers/axi/axi-uclass.c | 40 ++++++++++++++++++++++++++
include/axi.h | 75 ++++++++++++++++++++++++++++++++++++++++++++++++
include/dm/uclass-id.h | 1 +
7 files changed, 140 insertions(+)
create mode 100644 drivers/axi/Kconfig
create mode 100644 drivers/axi/Makefile
create mode 100644 drivers/axi/axi-uclass.c
create mode 100644 include/axi.h
diff --git a/drivers/Kconfig b/drivers/Kconfig
index c2e813f5adf..eeaaa7575cd 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -8,6 +8,8 @@ source "drivers/adc/Kconfig"
source "drivers/ata/Kconfig"
+source "drivers/axi/Kconfig"
+
source "drivers/block/Kconfig"
source "drivers/bootcount/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index b3f1b600a55..54b396d6368 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -99,6 +99,7 @@ obj-y += input/
obj-y += soc/
obj-$(CONFIG_REMOTEPROC) += remoteproc/
obj-y += thermal/
+obj-y += axi/
obj-$(CONFIG_MACH_PIC32) += ddr/microchip/
endif
diff --git a/drivers/axi/Kconfig b/drivers/axi/Kconfig
new file mode 100644
index 00000000000..4e4153b4283
--- /dev/null
+++ b/drivers/axi/Kconfig
@@ -0,0 +1,13 @@
+menuconfig AXI
+ bool "AXI bus drivers"
+ help
+ Support AXI (Advanced eXtensible Interface) busses, a on-chip
+ interconnect specification for managing functional blocks in SoC
+ designs, which is also often used in designs involving FPGAs (e.g.
+ communication with IP cores in Xilinx FPGAs).
+
+ These types of busses expose a virtual address space that can be
+ accessed using different address widths (8, 16, and 32 are supported
+ for now).
+
+ Other similar bus architectures may be compatible as well.
diff --git a/drivers/axi/Makefile b/drivers/axi/Makefile
new file mode 100644
index 00000000000..100a77788a2
--- /dev/null
+++ b/drivers/axi/Makefile
@@ -0,0 +1,8 @@
+#
+# (C) Copyright 2017
+# Mario Six, Guntermann & Drunck GmbH, mario....@gdsys.cc
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-$(CONFIG_AXI) += axi-uclass.o
diff --git a/drivers/axi/axi-uclass.c b/drivers/axi/axi-uclass.c
new file mode 100644
index 00000000000..3a5ddf3a46a
--- /dev/null
+++ b/drivers/axi/axi-uclass.c
@@ -0,0 +1,40 @@
+/*
+ * (C) Copyright 2017
+ * Mario Six, Guntermann & Drunck GmbH, mario....@gdsys.cc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <axi.h>
+
+int axi_read(struct udevice *dev, ulong address, void *data,
+ enum axi_size_t size)
+{
+ struct axi_ops *ops = axi_get_ops(dev);
+
+ if (!ops->read)
+ return -ENOSYS;
+
+ return ops->read(dev, address, data, size);
+}
+
+int axi_write(struct udevice *dev, ulong address, void *data,
+ enum axi_size_t size)
+{
+ struct axi_ops *ops = axi_get_ops(dev);
+
+ if (!ops->write)
+ return -ENOSYS;
+
+ return ops->write(dev, address, data, size);
+}
+
+UCLASS_DRIVER(axi) = {
+ .id = UCLASS_AXI,
+ .name = "axi",
+ .post_bind = dm_scan_fdt_dev,
+ .flags = DM_UC_FLAG_SEQ_ALIAS,
+};
+
diff --git a/include/axi.h b/include/axi.h
new file mode 100644
index 00000000000..317e931a6cf
--- /dev/null
+++ b/include/axi.h
@@ -0,0 +1,75 @@
+/*
+ * (C) Copyright 2017
+ * Mario Six, Guntermann & Drunck GmbH, mario....@gdsys.cc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#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
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index d7f9df3583a..0aad4bc14d7 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -43,6 +43,7 @@ enum uclass_id {
UCLASS_I2C_GENERIC, /* Generic I2C device */
UCLASS_I2C_MUX, /* I2C multiplexer */
UCLASS_IDE, /* IDE device */
+ UCLASS_AXI, /* AXI busses */
UCLASS_IRQ, /* Interrupt controller */
UCLASS_KEYBOARD, /* Keyboard input device */
UCLASS_LED, /* Light-emitting diode (LED) */
--
2.11.0
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