[U-Boot] [PATCH 1/7] drivers: Add AXI uclass and ihs_axi driver
Mario Six
mario.six at gdsys.cc
Wed Mar 28 12:40:15 UTC 2018
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 at gdsys.cc>
---
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/axi/Kconfig | 24 ++++++
drivers/axi/Makefile | 9 +++
drivers/axi/axi-uclass.c | 40 ++++++++++
drivers/axi/ihs_axi.c | 199 +++++++++++++++++++++++++++++++++++++++++++++++
include/axi.h | 75 ++++++++++++++++++
include/dm/uclass-id.h | 1 +
8 files changed, 351 insertions(+)
create mode 100644 drivers/axi/Kconfig
create mode 100644 drivers/axi/Makefile
create mode 100644 drivers/axi/axi-uclass.c
create mode 100644 drivers/axi/ihs_axi.c
create mode 100644 include/axi.h
diff --git a/drivers/Kconfig b/drivers/Kconfig
index c2e813f5ad..eeaaa7575c 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 6846d181aa..f54a10f3ad 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -100,6 +100,7 @@ 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 0000000000..19e1b7fd2f
--- /dev/null
+++ b/drivers/axi/Kconfig
@@ -0,0 +1,24 @@
+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.
+
+if AXI
+
+config IHS_AXI
+ bool "Enable IHS AXI driver"
+ depends on DM
+ help
+ Support for IHS AXI bus on a gdsys IHS FPGA used to communicate with
+ IP cores in the FPGA (e.g. video transmitter cores).
+
+endif
diff --git a/drivers/axi/Makefile b/drivers/axi/Makefile
new file mode 100644
index 0000000000..18d9380e9b
--- /dev/null
+++ b/drivers/axi/Makefile
@@ -0,0 +1,9 @@
+#
+# (C) Copyright 2017
+# Mario Six, Guntermann & Drunck GmbH, mario.six at gdsys.cc
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-$(CONFIG_AXI) += axi-uclass.o
+obj-$(CONFIG_IHS_AXI) += ihs_axi.o
diff --git a/drivers/axi/axi-uclass.c b/drivers/axi/axi-uclass.c
new file mode 100644
index 0000000000..3a5ddf3a46
--- /dev/null
+++ b/drivers/axi/axi-uclass.c
@@ -0,0 +1,40 @@
+/*
+ * (C) Copyright 2017
+ * Mario Six, Guntermann & Drunck GmbH, mario.six at 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/drivers/axi/ihs_axi.c b/drivers/axi/ihs_axi.c
new file mode 100644
index 0000000000..71bb67421f
--- /dev/null
+++ b/drivers/axi/ihs_axi.c
@@ -0,0 +1,199 @@
+/*
+ * (C) Copyright 2016
+ * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach at gdsys.cc
+ *
+ * (C) Copyright 2017
+ * Mario Six, Guntermann & Drunck GmbH, mario.six at gdsys.cc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <axi.h>
+#include <dm.h>
+#include <fpgamap.h>
+#include "../misc/gdsys_soc.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum {
+ REG_INTERRUPT_STATUS = 0x00,
+ REG_INTERRUPT_ENABLE_CONTROL = 0x02,
+ REG_ADDRESS_LSB = 0x04,
+ REG_ADDRESS_MSB = 0x06,
+ REG_WRITE_DATA_LSB = 0x08,
+ REG_WRITE_DATA_MSB = 0x0A,
+ REG_READ_DATA_LSB = 0x0C,
+ REG_READ_DATA_MSB = 0x0E,
+};
+
+struct ihs_axi_priv {
+ fdt_addr_t addr;
+};
+
+enum {
+ STATUS_EVENT_MASK = GENMASK(15, 12),
+
+ STATUS_READ_COMPLETE_EVENT = BIT(15),
+ STATUS_WRITE_COMPLETE_EVENT = BIT(14),
+ STATUS_TIMEOUT_EVENT = BIT(13),
+ STATUS_ERROR_EVENT = BIT(12),
+ STATUS_AXI_INT = BIT(11),
+ STATUS_READ_DATA_AVAILABLE = BIT(7),
+ STATUS_BUSY = BIT(6),
+ STATUS_INIT_DONE = BIT(5),
+};
+
+enum {
+ CONTROL_EVENT_ENABLE_MASK = GENMASK(15, 11),
+ CONTROL_CMD_MASK = GENMASK(3, 0),
+
+ CONTROL_READ_COMPLETE_EVENT_ENABLE = BIT(15),
+ CONTROL_WRITE_COMPLETE_EVENT_ENABLE = BIT(14),
+ CONTROL_TIMEOUT_EVENT_ENABLE = BIT(13),
+ CONTROL_ERROR_EVENT_ENABLE = BIT(12),
+ CONTROL_AXI_INT_ENABLE = BIT(11),
+
+ CONTROL_CMD_NOP = 0x0,
+ CONTROL_CMD_WRITE = 0x8,
+ CONTROL_CMD_WRITE_POST_INC = 0x9,
+ CONTROL_CMD_READ = 0xa,
+ CONTROL_CMD_READ_POST_INC = 0xb,
+
+};
+
+static int ihs_axi_transfer(struct udevice *bus, ulong address, u16 cmd,
+ u16 complete_flag)
+{
+ struct ihs_axi_priv *priv = dev_get_priv(bus);
+ struct udevice *fpga;
+ u16 wait_mask = complete_flag | STATUS_TIMEOUT_EVENT |
+ STATUS_ERROR_EVENT;
+ u16 status;
+ u16 addr_low, addr_high;
+ uint k;
+
+ gdsys_soc_get_fpga(bus, &fpga);
+
+ cmd &= CONTROL_CMD_MASK;
+
+ addr_low = address & 0xffff;
+ fpgamap_write(fpga, priv->addr + REG_ADDRESS_LSB, &addr_low,
+ FPGAMAP_SIZE_16);
+ addr_high = (address >> 16) & 0xffff;
+ fpgamap_write(fpga, priv->addr + REG_ADDRESS_MSB, &addr_high,
+ FPGAMAP_SIZE_16);
+
+ fpgamap_write(fpga, priv->addr + REG_INTERRUPT_STATUS, &wait_mask,
+ FPGAMAP_SIZE_16);
+ fpgamap_write(fpga, priv->addr + REG_INTERRUPT_ENABLE_CONTROL, &cmd,
+ FPGAMAP_SIZE_16);
+
+ for (k = 10; k > 0; --k) {
+ fpgamap_read(fpga, priv->addr + REG_INTERRUPT_STATUS, &status,
+ FPGAMAP_SIZE_16);
+ if (status & wait_mask)
+ break;
+ udelay(1);
+ }
+
+ if (!k)
+ fpgamap_read(fpga, priv->addr + REG_INTERRUPT_STATUS, &status,
+ FPGAMAP_SIZE_16);
+
+ if (status & complete_flag)
+ return 0;
+
+ if (status & STATUS_ERROR_EVENT)
+ return -EIO;
+
+ return -ETIMEDOUT;
+}
+
+/*
+ * API
+ */
+
+int ihs_axi_read(struct udevice *dev, ulong address, void *data,
+ enum axi_size_t size)
+{
+ struct ihs_axi_priv *priv = dev_get_priv(dev);
+ struct udevice *fpga;
+ int res = 0;
+ u16 data_lsb, data_msb;
+ u32 *p = data;
+
+ if (size != AXI_SIZE_32)
+ return -ENOSYS;
+
+ gdsys_soc_get_fpga(dev, &fpga);
+
+ res = ihs_axi_transfer(dev, address, CONTROL_CMD_READ,
+ STATUS_READ_COMPLETE_EVENT);
+ if (res < 0)
+ return res;
+
+ fpgamap_read(fpga, priv->addr + REG_READ_DATA_LSB, &data_lsb,
+ FPGAMAP_SIZE_16);
+ fpgamap_read(fpga, priv->addr + REG_READ_DATA_MSB, &data_msb,
+ FPGAMAP_SIZE_16);
+
+ *p = (data_msb << 16) | data_lsb;
+
+ return res;
+}
+
+int ihs_axi_write(struct udevice *dev, ulong address, void *data,
+ enum axi_size_t size)
+{
+ struct ihs_axi_priv *priv = dev_get_priv(dev);
+ struct udevice *fpga;
+ int res = 0;
+ u32 *p = data;
+ u16 data_low, data_high;
+
+ if (size != AXI_SIZE_32)
+ return -ENOSYS;
+
+ gdsys_soc_get_fpga(dev, &fpga);
+
+ data_low = *p & 0xffff;
+ fpgamap_write(fpga, priv->addr + REG_WRITE_DATA_LSB, &data_low,
+ FPGAMAP_SIZE_16);
+ data_high = (*p >> 16) & 0xffff;
+ fpgamap_write(fpga, priv->addr + REG_WRITE_DATA_MSB, &data_high,
+ FPGAMAP_SIZE_16);
+
+ res = ihs_axi_transfer(dev, address, CONTROL_CMD_WRITE,
+ STATUS_WRITE_COMPLETE_EVENT);
+
+ return res;
+}
+
+static const struct udevice_id ihs_axi_ids[] = {
+ { .compatible = "gdsys,ihs_axi" },
+ { /* sentinel */ }
+};
+
+static const struct axi_ops ihs_axi_ops = {
+ .read = ihs_axi_read,
+ .write = ihs_axi_write,
+};
+
+int ihs_axi_probe(struct udevice *dev)
+{
+ struct ihs_axi_priv *priv = dev_get_priv(dev);
+
+ priv->addr = dev_read_u32_default(dev, "reg", -1);
+
+ return 0;
+}
+
+U_BOOT_DRIVER(ihs_axi_bus) = {
+ .name = "ihs_axi_bus",
+ .id = UCLASS_AXI,
+ .of_match = ihs_axi_ids,
+ .ops = &ihs_axi_ops,
+ .priv_auto_alloc_size = sizeof(struct ihs_axi_priv),
+ .probe = ihs_axi_probe,
+};
diff --git a/include/axi.h b/include/axi.h
new file mode 100644
index 0000000000..317e931a6c
--- /dev/null
+++ b/include/axi.h
@@ -0,0 +1,75 @@
+/*
+ * (C) Copyright 2017
+ * Mario Six, Guntermann & Drunck GmbH, mario.six at 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 07fabc3ce6..9857796e54 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) */
--
2.16.1
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