[rtems commit] bsps/xilinx_zynq: Add SPI driver for xilinx-axi-spi
Jan Sommer
jan at rtems.org
Tue Apr 6 13:16:28 UTC 2021
Module: rtems
Branch: 5
Commit: ce2b276803e6febe0492a89e48ae5de3a7d88cf1
Changeset: http://git.rtems.org/rtems/commit/?id=ce2b276803e6febe0492a89e48ae5de3a7d88cf1
Author: Jan Sommer <jan.sommer at dlr.de>
Date: Thu Feb 25 17:52:03 2021 +0100
bsps/xilinx_zynq: Add SPI driver for xilinx-axi-spi
Updates #4370
---
bsps/arm/include/bsp/xilinx-axi-spi-regs.h | 88 +++++++
bsps/arm/include/bsp/xilinx-axi-spi.h | 67 +++++
bsps/arm/shared/spi/xilinx-axi-spi.c | 402 +++++++++++++++++++++++++++++
3 files changed, 557 insertions(+)
diff --git a/bsps/arm/include/bsp/xilinx-axi-spi-regs.h b/bsps/arm/include/bsp/xilinx-axi-spi-regs.h
new file mode 100644
index 0000000..6211c5b
--- /dev/null
+++ b/bsps/arm/include/bsp/xilinx-axi-spi-regs.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/*
+ * Copyright (C) 2021 Jan Sommer, German Aerospace Center (DLR)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LIBBSP_ARM_XILINX_AXI_SPI_REGS_H
+#define LIBBSP_ARM_XILINX_AXI_SPI_REGS_H
+
+#include <bsp/utility.h>
+
+typedef struct {
+ uint32_t reserved1[7];
+ uint32_t globalirq;
+#define XILINX_AXI_SPI_GLOBAL_IRQ_ENABLE BSP_BIT32(31)
+ uint32_t irqstatus;
+ uint32_t reserved2;
+ uint32_t irqenable;
+#define XILINX_AXI_SPI_IRQ_CMD_ERR BSP_BIT32(13)
+#define XILINX_AXI_SPI_IRQ_LOOP_ERR BSP_BIT32(12)
+#define XILINX_AXI_SPI_IRQ_MSB_ERR BSP_BIT32(11)
+#define XILINX_AXI_SPI_IRQ_SLV_ERR BSP_BIT32(10)
+#define XILINX_AXI_SPI_IRQ_CPOL_CPHA_ERR BSP_BIT32(9)
+#define XILINX_AXI_SPI_IRQ_RXNEMPTY BSP_BIT32(8)
+#define XILINX_AXI_SPI_IRQ_CS_MODE BSP_BIT32(7)
+#define XILINX_AXI_SPI_IRQ_TXHALF BSP_BIT32(6)
+#define XILINX_AXI_SPI_IRQ_RXOVR BSP_BIT32(5)
+#define XILINX_AXI_SPI_IRQ_RXFULL BSP_BIT32(4)
+#define XILINX_AXI_SPI_IRQ_TXUF BSP_BIT32(3)
+#define XILINX_AXI_SPI_IRQ_TXEMPTY BSP_BIT32(2)
+#define XILINX_AXI_SPI_IRQ_SLV_MODF BSP_BIT32(1)
+#define XILINX_AXI_SPI_IRQ_MODF BSP_BIT32(0)
+ uint32_t reserved3[5];
+ uint32_t reset;
+#define XILINX_AXI_SPI_RESET 0x0000000a
+ uint32_t reserved4[7];
+ uint32_t control;
+#define XILINX_AXI_SPI_CONTROL_LSBFIRST BSP_BIT32(9)
+#define XILINX_AXI_SPI_CONTROL_MST_TRANS_INHIBIT BSP_BIT32(8)
+#define XILINX_AXI_SPI_CONTROL_MANUAL_CS BSP_BIT32(7)
+#define XILINX_AXI_SPI_CONTROL_RX_FIFO_RESET BSP_BIT32(6)
+#define XILINX_AXI_SPI_CONTROL_TX_FIFO_RESET BSP_BIT32(5)
+#define XILINX_AXI_SPI_CONTROL_CPHA BSP_BIT32(4)
+#define XILINX_AXI_SPI_CONTROL_CPOL BSP_BIT32(3)
+#define XILINX_AXI_SPI_CONTROL_MSTREN BSP_BIT32(2)
+#define XILINX_AXI_SPI_CONTROL_SPIEN BSP_BIT32(1)
+#define XILINX_AXI_SPI_CONTROL_LOOP BSP_BIT32(0)
+ uint32_t status;
+#define XILINX_AXI_SPI_STATUS_CMD_ERR BSP_BIT32(10)
+#define XILINX_AXI_SPI_STATUS_LOOP_ERR BSP_BIT32(9)
+#define XILINX_AXI_SPI_STATUS_MSB_ERR BSP_BIT32(8)
+#define XILINX_AXI_SPI_STATUS_SLV_ERR BSP_BIT32(7)
+#define XILINX_AXI_SPI_STATUS_CPOL_CPHA_ERR BSP_BIT32(6)
+#define XILINX_AXI_SPI_STATUS_SLV_MODE BSP_BIT32(5)
+#define XILINX_AXI_SPI_STATUS_MODF BSP_BIT32(4)
+#define XILINX_AXI_SPI_STATUS_TXFULL BSP_BIT32(3)
+#define XILINX_AXI_SPI_STATUS_TXEMPTY BSP_BIT32(2)
+#define XILINX_AXI_SPI_STATUS_RXFULL BSP_BIT32(1)
+#define XILINX_AXI_SPI_STATUS_RXEMPTY BSP_BIT32(0)
+ uint32_t txdata;
+ uint32_t rxdata;
+ uint32_t cs;
+ uint32_t tx_fifo_len;
+ uint32_t rx_fifo_len;
+} xilinx_axi_spi;
+
+#endif /* LIBBSP_ARM_XILINX_AXI_SPI_REGS_H */
diff --git a/bsps/arm/include/bsp/xilinx-axi-spi.h b/bsps/arm/include/bsp/xilinx-axi-spi.h
new file mode 100644
index 0000000..1f5e2a9
--- /dev/null
+++ b/bsps/arm/include/bsp/xilinx-axi-spi.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/*
+ * Copyright (C) 2021 Jan Sommer, German Aerospace Center (DLR)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LIBBSP_ARM_XILINX_AXI_SPI_H
+#define LIBBSP_ARM_XILINX_AXI_SPI_H
+
+#include <rtems.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * Register Xilinx AXI SPI device
+ *
+ * Note:
+ * The Xilinx Quad SPI device is very versatile and
+ * supports many options. This driver assumes the
+ * following setup:
+ * - Standard SPI mode and AXI Lite interface
+ * - FIFO available (driver might also work without FIFOs)
+ *
+ * @param bus_path path for the new device node (e.g. "/dev/spi0")
+ * @param register_base base address of the device
+ * @param fifo_size Configured fifo size. Either 0, 16 or 256
+ * @param num_cs Number of configured CS lines (0-32)
+ *
+ * @return 0 on success. Negative number otherwise.
+ *
+ */
+int spi_bus_register_xilinx_axi(
+ const char *bus_path,
+ uintptr_t register_base,
+ uint32_t fifo_size,
+ uint32_t num_cs,
+ rtems_vector_number irq
+);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* LIBBSP_ARM_XILINX_AXI_SPI_H */
diff --git a/bsps/arm/shared/spi/xilinx-axi-spi.c b/bsps/arm/shared/spi/xilinx-axi-spi.c
new file mode 100644
index 0000000..7c4c9de
--- /dev/null
+++ b/bsps/arm/shared/spi/xilinx-axi-spi.c
@@ -0,0 +1,402 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/*
+ * Copyright (C) 2021 Jan Sommer, German Aerospace Center (DLR)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include <bsp.h>
+
+#include <rtems/irq-extension.h>
+#include <sys/param.h> /* MAX() */
+
+#include <dev/spi/spi.h>
+#include <bsp/xilinx-axi-spi.h>
+#include <bsp/xilinx-axi-spi-regs.h>
+
+#define XILINX_AXI_SPI_CS_NONE 0xFF
+
+typedef struct xilinx_axi_spi_bus xilinx_axi_spi_bus;
+
+struct xilinx_axi_spi_bus {
+ spi_bus base;
+ volatile xilinx_axi_spi *regs;
+ uint32_t fifo_size;
+ uint32_t num_cs;
+ uint32_t msg_todo;
+ const spi_ioc_transfer *msg;
+ uint32_t todo;
+ uint32_t in_transfer;
+ uint8_t *rx_buf;
+ const uint8_t *tx_buf;
+ rtems_id task_id;
+ rtems_vector_number irq;
+};
+
+
+static void xilinx_axi_spi_disable_interrupts(volatile xilinx_axi_spi *regs)
+{
+ regs->globalirq = 0;
+ regs->irqenable = 0;
+}
+
+static bool xilinx_axi_spi_rx_fifo_not_empty(volatile xilinx_axi_spi *regs)
+{
+ return (regs->status & XILINX_AXI_SPI_STATUS_RXEMPTY) == 0;
+}
+
+static void xilinx_axi_spi_reset(xilinx_axi_spi_bus *bus)
+{
+ volatile xilinx_axi_spi *regs = bus->regs;
+ uint32_t control;
+
+ /* Initiate soft reset for initial state */
+ regs->reset = XILINX_AXI_SPI_RESET;
+
+ /* Configure as master */
+ control = regs->control;
+ control |= XILINX_AXI_SPI_CONTROL_MSTREN;
+ regs->control = control;
+}
+
+static void xilinx_axi_spi_done(xilinx_axi_spi_bus *bus)
+{
+ volatile xilinx_axi_spi *regs = bus->regs;
+ uint32_t control = regs->control;
+ control &= ~XILINX_AXI_SPI_CONTROL_SPIEN;
+ regs->control = control;
+
+ xilinx_axi_spi_disable_interrupts(regs);
+ rtems_event_transient_send(bus->task_id);
+}
+
+static void xilinx_axi_spi_push(xilinx_axi_spi_bus *bus, volatile xilinx_axi_spi *regs)
+{
+ while (bus->todo > 0 && bus->in_transfer < bus->fifo_size) {
+ uint8_t val = 0;
+ if (bus->tx_buf != NULL) {
+ val = *bus->tx_buf;
+ ++bus->tx_buf;
+ }
+
+ --bus->todo;
+ regs->txdata = val;
+ ++bus->in_transfer;
+ }
+}
+
+static void
+xilinx_axi_spi_set_chipsel(xilinx_axi_spi_bus *bus, uint32_t cs)
+{
+
+ volatile xilinx_axi_spi *regs = bus->regs;
+ uint32_t cs_bit = XILINX_AXI_SPI_CS_NONE;
+
+ if (cs != SPI_NO_CS && cs < bus->num_cs) {
+ cs_bit &= ~(1<<cs);
+ }
+ bus->base.cs = cs;
+
+ regs->cs = cs_bit;
+}
+
+static void xilinx_axi_spi_config(
+ xilinx_axi_spi_bus *bus,
+ volatile xilinx_axi_spi *regs,
+ uint32_t mode,
+ uint8_t cs
+)
+{
+ spi_bus *base = &bus->base;
+ uint32_t control = regs->control;
+
+ control &= ~XILINX_AXI_SPI_CONTROL_SPIEN;
+ regs->control = control;
+
+ if ((mode & SPI_CPHA) != 0) {
+ control |= XILINX_AXI_SPI_CONTROL_CPHA;
+ } else {
+ control &= ~XILINX_AXI_SPI_CONTROL_CPHA;
+ }
+
+ if ((mode & SPI_CPOL) != 0) {
+ control |= XILINX_AXI_SPI_CONTROL_CPOL;
+ } else {
+ control &= ~XILINX_AXI_SPI_CONTROL_CPOL;
+ }
+
+ if ((mode & SPI_LOOP) != 0) {
+ control |= XILINX_AXI_SPI_CONTROL_LOOP;
+ } else {
+ control &= ~XILINX_AXI_SPI_CONTROL_LOOP;
+ }
+
+ regs->control = control;
+ xilinx_axi_spi_set_chipsel(bus, cs);
+
+ base->mode = mode;
+ base->cs = cs;
+
+}
+
+static void
+xilinx_axi_spi_next_msg(xilinx_axi_spi_bus *bus, volatile xilinx_axi_spi *regs)
+{
+ uint32_t control = regs->control;
+ control |= XILINX_AXI_SPI_CONTROL_MST_TRANS_INHIBIT
+ | XILINX_AXI_SPI_CONTROL_RX_FIFO_RESET
+ | XILINX_AXI_SPI_CONTROL_TX_FIFO_RESET;
+ regs->control = control;
+
+ if (bus->msg_todo > 0) {
+ const spi_ioc_transfer *msg;
+ spi_bus *base = &bus->base;
+
+ msg = bus->msg;
+
+ if (
+ msg->mode != base->mode
+ || msg->cs != base->cs
+ ) {
+ xilinx_axi_spi_config(
+ bus,
+ regs,
+ msg->mode,
+ msg->cs
+ );
+ }
+
+ if ((msg->mode & SPI_NO_CS) != 0) {
+ xilinx_axi_spi_set_chipsel(bus, XILINX_AXI_SPI_CS_NONE);
+ }
+
+ bus->todo = msg->len;
+ bus->rx_buf = msg->rx_buf;
+ bus->tx_buf = msg->tx_buf;
+ xilinx_axi_spi_push(bus, regs);
+
+ xilinx_axi_spi_disable_interrupts(regs);
+ if (
+ bus->todo < bus->fifo_size
+ || bus->fifo_size == 1) {
+ /* if the msg fits into the FIFO, wait for empty TX buffer */
+ regs->irqenable = XILINX_AXI_SPI_IRQ_TXEMPTY;
+
+ } else {
+ /* if the msg does not fit, refill tx_buf when the tx FIFO is half empty */
+ regs->irqenable = XILINX_AXI_SPI_IRQ_TXHALF;
+ }
+ regs->globalirq = XILINX_AXI_SPI_GLOBAL_IRQ_ENABLE;
+ control = regs->control;
+ control |= XILINX_AXI_SPI_CONTROL_SPIEN;
+ control &= ~XILINX_AXI_SPI_CONTROL_MST_TRANS_INHIBIT;
+ regs->control = control;
+ } else {
+ xilinx_axi_spi_done(bus);
+ }
+}
+
+static void xilinx_axi_spi_interrupt(void *arg)
+{
+ xilinx_axi_spi_bus *bus;
+ volatile xilinx_axi_spi *regs;
+
+ bus = arg;
+ regs = bus->regs;
+
+ /* Clear interrupt flag. It's safe, since only one IRQ active at a time */
+ regs->irqstatus = regs->irqenable;
+
+ while (xilinx_axi_spi_rx_fifo_not_empty(regs)) {
+ uint32_t val = regs->rxdata;
+ if (bus->rx_buf != NULL) {
+ *bus->rx_buf = (uint8_t)val;
+ ++bus->rx_buf;
+ }
+ --bus->in_transfer;
+ }
+
+ if (bus->todo > 0) {
+ xilinx_axi_spi_push(bus, regs);
+ } else if (bus->in_transfer > 0) {
+ /* Wait until all bytes have been transfered */
+ regs->irqenable = XILINX_AXI_SPI_IRQ_TXEMPTY;
+ } else {
+ --bus->msg_todo;
+ ++bus->msg;
+ xilinx_axi_spi_next_msg(bus, regs);
+ }
+}
+
+static int xilinx_axi_spi_check_messages(
+ xilinx_axi_spi_bus *bus,
+ const spi_ioc_transfer *msg,
+ uint32_t size)
+{
+ while(size > 0) {
+ if (msg->bits_per_word != 8) {
+ return -EINVAL;
+ }
+ if ((msg->mode &
+ ~(SPI_CPHA | SPI_CPOL | SPI_NO_CS)) != 0) {
+ return -EINVAL;
+ }
+ if ((msg->mode & SPI_NO_CS) == 0 &&
+ (msg->cs > bus->num_cs)) {
+ return -EINVAL;
+ }
+
+ ++msg;
+ --size;
+ }
+
+ return 0;
+}
+
+static int xilinx_axi_spi_transfer(
+ spi_bus *base,
+ const spi_ioc_transfer *msgs,
+ uint32_t n
+)
+{
+ xilinx_axi_spi_bus *bus;
+ int rv;
+
+ bus = (xilinx_axi_spi_bus *) base;
+
+ rv = xilinx_axi_spi_check_messages(bus, msgs, n);
+
+ if (rv == 0) {
+ bus->msg_todo = n;
+ bus->msg = &msgs[0];
+ bus->task_id = rtems_task_self();
+
+ xilinx_axi_spi_next_msg(bus, bus->regs);
+ rtems_event_transient_receive(RTEMS_WAIT, RTEMS_NO_TIMEOUT);
+ xilinx_axi_spi_set_chipsel(bus, XILINX_AXI_SPI_CS_NONE);
+ }
+ return rv;
+}
+
+static void xilinx_axi_spi_destroy(spi_bus *base)
+{
+ xilinx_axi_spi_bus *bus;
+
+ bus = (xilinx_axi_spi_bus *) base;
+ rtems_interrupt_handler_remove(bus->irq, xilinx_axi_spi_interrupt, bus);
+ spi_bus_destroy_and_free(&bus->base);
+}
+
+static int xilinx_axi_spi_setup(spi_bus *base)
+{
+ xilinx_axi_spi_bus *bus;
+ uint32_t mode = base->mode;
+
+ bus = (xilinx_axi_spi_bus *) base;
+
+ if (bus->base.bits_per_word > 8) {
+ return -EINVAL;
+ }
+
+ /* SPI_CS_HIGH not supported */
+ if (mode & SPI_CS_HIGH) {
+ return -EINVAL;
+ }
+
+ xilinx_axi_spi_config(
+ bus,
+ bus->regs,
+ base->mode,
+ base->cs
+ );
+ return 0;
+}
+
+int spi_bus_register_xilinx_axi(
+ const char *bus_path,
+ uintptr_t register_base,
+ uint32_t fifo_size,
+ uint32_t num_cs,
+ rtems_vector_number irq)
+{
+ xilinx_axi_spi_bus *bus;
+ spi_bus *base;
+ int sc;
+
+ if (fifo_size != 0 && fifo_size != 16 && fifo_size != 256) {
+ return -1;
+ }
+
+ if (num_cs > 32) {
+ return -1;
+ }
+
+ bus = (xilinx_axi_spi_bus *) spi_bus_alloc_and_init(sizeof(*bus));
+ if (bus == NULL){
+ return -1;
+ }
+
+ base = &bus->base;
+ bus->regs = (volatile xilinx_axi_spi *) register_base;
+ bus->irq = irq;
+ bus->num_cs = num_cs;
+
+ /* For operation without FIFO set fifo_size to 1
+ * so that comparison operators work
+ */
+ if (fifo_size == 0) {
+ bus->fifo_size = 1;
+ } else {
+ bus->fifo_size = fifo_size;
+ }
+
+ base->cs = SPI_NO_CS;
+
+ xilinx_axi_spi_reset(bus);
+ xilinx_axi_spi_config(
+ bus,
+ bus->regs,
+ base->mode,
+ base->cs
+ );
+
+
+ sc = rtems_interrupt_handler_install(
+ bus->irq,
+ "XSPI",
+ RTEMS_INTERRUPT_UNIQUE,
+ xilinx_axi_spi_interrupt,
+ bus
+ );
+ if (sc != RTEMS_SUCCESSFUL) {
+ (*bus->base.destroy)(&bus->base);
+ rtems_set_errno_and_return_minus_one(EAGAIN);
+ }
+
+ bus->base.transfer = xilinx_axi_spi_transfer;
+ bus->base.destroy = xilinx_axi_spi_destroy;
+ bus->base.setup = xilinx_axi_spi_setup;
+
+ return spi_bus_register(&bus->base, bus_path);
+}
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