arch/arm64/imx9: Add support for pmic

Soc reset functionality via pmic

Signed-off-by: Jouni Ukkonen <[email protected]>

arch/arm64/src/imx9/Kconfig

@@ -450,6 +450,11 @@ endmenu # USB device controller driver (DCD) options
 
 endif # IMX9_USBDEV
 
+config IMX9_PMIC_I2C
+	int "PMIC I2C bus"
+	default 2
+	range 1 8
+
 config IMX9_ENET
 	bool "Ethernet"
 	default n

arch/arm64/src/imx9/Make.defs

@@ -26,7 +26,7 @@ endif
 
 # i.MX9-specific C source files
 
-CHIP_CSRCS = imx9_boot.c imx9_ccm.c imx9_clockconfig.c imx9_gpio.c imx9_iomuxc.c
+CHIP_CSRCS = imx9_boot.c imx9_ccm.c imx9_clockconfig.c imx9_gpio.c imx9_iomuxc.c imx9_pmic.c
 
 ifeq ($(CONFIG_ARCH_CHIP_IMX93),y)
   CHIP_CSRCS += imx9_lpuart.c imx9_lowputc.c

arch/arm64/src/imx9/imx9_pmic.c

@@ -0,0 +1,141 @@
+/****************************************************************************
+ * arch/arm64/src/imx9/imx9_pmic.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <nuttx/arch.h>
+#include <nuttx/clock.h>
+#include <debug.h>
+#include <sys/types.h>
+#include <syslog.h>
+#include <errno.h>
+#include <nuttx/i2c/i2c_master.h>
+#include "imx9_lpi2c.h"
+#include "chip.h"
+#include "arm64_internal.h"
+#include "imx9_trdc.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* PCA9451A in IMX9 platform */
+
+#define PCA9451A_I2C_ADDR       0x25
+#define REG_SW_RST              0x06
+#define REG_POWERON_STAT        0x05
+#define COLD_RESET              0x64
+#define WARM_RESET              0x35
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: imx9_pmic_reset
+ *
+ * Description:
+ *   Reset SoC via pmic
+ *
+ ****************************************************************************/
+
+void imx9_pmic_reset(void)
+{
+  struct i2c_master_s *i2c;
+  struct i2c_msg_s msg;
+  uint8_t buffer[2];
+  int ret;
+
+  i2c = imx9_i2cbus_initialize(CONFIG_IMX9_PMIC_I2C);
+
+  if (i2c == NULL)
+    {
+      return;
+    }
+
+  buffer[0] = REG_SW_RST;
+  buffer[1] = COLD_RESET;
+
+  msg.frequency = 400000;
+  msg.addr      = PCA9451A_I2C_ADDR;
+  msg.flags     = 0;
+  msg.buffer    = buffer;
+  msg.length    = 2;
+
+  ret = I2C_TRANSFER(i2c, &msg, 1);
+  if (ret < 0)
+    {
+      _err("ERROR: Failed to write reset via I2C2 interface\n");
+    }
+}
+
+/****************************************************************************
+ * Name: imx9_get_pmic_reset_reason
+ *
+ * Description:
+ *   Read reset reason from pmic
+ *
+ ****************************************************************************/
+
+uint32_t imx9_pmic_getreset_reason(void)
+{
+  struct i2c_master_s *i2c;
+  struct i2c_msg_s msgs[2];
+  uint8_t reg_addr = REG_POWERON_STAT;
+  uint8_t data;
+  int ret;
+
+  i2c = imx9_i2cbus_initialize(CONFIG_IMX9_PMIC_I2C);
+  if (i2c == NULL)
+    {
+      _err("Failed to initialize I2C bus\n");
+      return -ENODEV;
+    }
+
+  msgs[0].frequency = 400000;
+  msgs[0].addr      = PCA9451A_I2C_ADDR;
+  msgs[0].flags     = 0;
+  msgs[0].buffer    = &reg_addr;
+  msgs[0].length    = 1;
+
+  msgs[1].frequency = 400000;
+  msgs[1].addr      = PCA9451A_I2C_ADDR;
+  msgs[1].flags     = I2C_M_READ;
+  msgs[1].buffer    = &data;
+  msgs[1].length    = 1;
+
+  ret = I2C_TRANSFER(i2c, msgs, 2);
+  if (ret < 0)
+    {
+      _err("I2C transfer failed: %d\n", ret);
+      imx9_i2cbus_uninitialize(i2c);
+      return ret;
+    }
+
+  imx9_i2cbus_uninitialize(i2c);
+  return (uint32_t)data;
+}

arch/arm64/src/imx9/imx9_pmic.h

@@ -0,0 +1,86 @@
+/****************************************************************************
+ * arch/arm64/src/imx9/imx9_pmic.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM64_SRC_IMX9_IMX9_PMIC_H
+#define __ARCH_ARM64_SRC_IMX9_IMX9_PMIC_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <arch/board/board.h>
+#include "arm64_internal.h"
+#include "hardware/imx9_memorymap.h"
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: imx9_pmic_getreset_reason
+ *
+ * Description:
+ *  Read reset reason from pmic via i2c
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   uin32_t, reset reason
+ *
+ ****************************************************************************/
+
+uint32_t imx9_pmic_getreset_reason(void);
+
+/****************************************************************************
+ * Name: imx9_pmic_reset
+ *
+ * Description:
+ *  Reset entire Soc
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void imx9_pmic_reset(void);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+
+#endif /* __ARCH_ARM64_SRC_IMX9_IMX9_PMIC_H */