arch/arm/src/imxrt: Add XBAR Support

arch/arm/src/imxrt/Make.defs

@@ -99,7 +99,7 @@ CHIP_ASRCS  =
 CHIP_CSRCS  = imxrt_allocateheap.c imxrt_start.c imxrt_clockconfig.c
 CHIP_CSRCS += imxrt_periphclks.c imxrt_irq.c imxrt_clrpend.c imxrt_gpio.c
 CHIP_CSRCS += imxrt_daisy.c imxrt_wdog.c imxrt_iomuxc.c imxrt_serial.c
-CHIP_CSRCS += imxrt_lowputc.c
+CHIP_CSRCS += imxrt_xbar.c imxrt_lowputc.c
 
 # Configuration-dependent i.MX RT files
 

arch/arm/src/imxrt/chip/imxrt_xbar.h

@@ -0,0 +1,63 @@
+/************************************************************************************
+ * arch/arm/src/imxrt/chip/imxrt_abar.h
+ *
+ *   Copyright (C) 2019 Gregory Nutt. All rights reserved.
+ *   Authors: Gregory Nutt <gnutt@nuttx.org>
+ *            David Sidrane <david_s5@nscdg.com>
+ *
+ * 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.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * 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 __ARCH_ARM_SRC_IMXRT_CHIP_IMXRT_XBAR_H
+#define __ARCH_ARM_SRC_IMXRT_CHIP_IMXRT_XBAR_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdint.h>
+#include "chip/imxrt_memorymap.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+#define IMXRT_SEL_PER_REG    2
+
+#define IMXRT_SEL0_SHIFTS    0    /* Bits 0-6: Input (XBARA_INn) to be muxed to
+                                   *           XBARA_OUTm */
+#define IMXRT_SEL0_MASK      (0x7f << IMXRT_SEL0_SHIFTS)
+                                  /* Bit 7: Reserved */
+#define IMXRT_SEL1_SHIFTS    8    /* Bits 8-14: Input (XBARA_INn) to be muxed to
+                                   *   XBARA_OUTm */
+#define IMXRT_SEL1_MASK      (0x7f << IMXRT_SEL1_SHIFTS)
+                                  /* Bit 15 Reserved */
+
+#endif /* __ARCH_ARM_SRC_IMXRT_CHIP_IMXRT_XBAR_H */

arch/arm/src/imxrt/imxrt_xbar.c

@@ -0,0 +1,125 @@
+/****************************************************************************
+ * arch/arm/src/imxrt/imxrt_xbar.c
+ *
+ *   Copyright (C) 2019 Gregory Nutt. All rights reserved.
+ *   Author: David Sidrane <david_s5@nscdg.com>
+ *
+ * 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.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <errno.h>
+#include "chip.h"
+#include "up_arch.h"
+#include "imxrt_xbar.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const uintptr_t g_xbars_addresses[] =
+{
+  IMXRT_XBAR1_BASE,
+  IMXRT_XBAR2_BASE,
+  IMXRT_XBAR3_BASE
+};
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: imxrt_xbar_connect
+ *
+ * Description:
+ *   This function maps the input_index of the cross bar to the output.
+ *
+ * input_index Parameters:
+ *   mux_index_out   - XBAR Output and mux_select choice.
+ *   mux_index_input - XBAR Input and input_index choice.
+ *
+ * Returned Value:
+ *   OK on success; Negated errno on failure.
+ *
+ ****************************************************************************/
+
+int imxrt_xbar_connect(uint16_t mux_index_out, uint16_t mux_index_input)
+{
+  uintptr_t address;
+  uint16_t mux_select;
+  uint16_t mux_input;
+  uint16_t xbar_index;
+  uint16_t clearbits;
+  int retval;
+
+  retval     = -EINVAL;
+  mux_select = IMXRT_SEL(mux_index_out);
+  mux_input  = IMXRT_SEL(mux_index_input);
+  xbar_index = IMXRT_XBAR(mux_index_out);
+  clearbits  = IMXRT_SEL0_MASK;
+
+  /* Verify:
+   * 1) The Xbar index is valid.
+   * 2) In and out are on the same Xbar.
+   * 3) Output index is an output.
+   * 4) Input index is input.
+   */
+
+  if (xbar_index < sizeof(g_xbars_addresses) / sizeof(g_xbars_addresses[0]) &&
+      (mux_index_out & XBAR_OUTPUT) == XBAR_OUTPUT &&
+      (mux_index_input & XBAR_INPUT) == XBAR_INPUT)
+    {
+      address = g_xbars_addresses[xbar_index];
+      address += (mux_select / IMXRT_SEL_PER_REG) * sizeof(uint16_t);
+
+      /* There are 2 selects per Register LSB is even selects and MSB is odd */
+
+      if (mux_select & 1)
+        {
+          clearbits <<= IMXRT_SEL1_SHIFTS;
+          mux_input <<= IMXRT_SEL1_SHIFTS;
+        }
+
+      modifyreg16(address, clearbits, mux_input);
+      retval = OK;
+    }
+
+  return retval;
+}