Commit fbec4149 authored by Anisetti Avinash Krishna's avatar Anisetti Avinash Krishna Committed by Henrik Brix Andersen
Browse files

drivers: mfd: Enabled motorola,mc146818 MFD 

Enabled Motorola, mc146818 MFD, which implements RTC
read/write operations and prevents data corruption
by synchronizing these operations.

Signed-off-by: default avatarAnisetti Avinash Krishna <anisetti.avinash.krishna@intel.com>
parent 4c8419b9

drivers/mfd/CMakeLists.txt

+1 −0
Changes for drivers/mfd/CMakeLists.txt: 1 added line, 0 removed lines.
Original line number Diff line number Diff line
@@ -26,3 +26,4 @@ zephyr_library_sources_ifdef(CONFIG_MFD_MAX22017 mfd_max22017.c) 
zephyr_library_sources_ifdef(CONFIG_MFD_MCHP_SAM_FLEXCOM mfd_mchp_sam_flexcom.c)

zephyr_library_sources_ifdef(CONFIG_MFD_PF1550 mfd_pf1550.c)

zephyr_library_sources_ifdef(CONFIG_MFD_PCA9422 mfd_pca9422.c)

zephyr_library_sources_ifdef(CONFIG_MFD_MOTOROLA_MC146818 mfd_mc146818.c)

drivers/mfd/Kconfig

+1 −0
Changes for drivers/mfd/Kconfig: 1 added line, 0 removed lines.
Original line number Diff line number Diff line
@@ -38,5 +38,6 @@ source "drivers/mfd/Kconfig.lpflexcomm" 
source "drivers/mfd/Kconfig.tle9104"

source "drivers/mfd/Kconfig.it8801"

source "drivers/mfd/Kconfig.pca9422"

source "drivers/mfd/Kconfig.mc146818"



endif # MFD

drivers/mfd/Kconfig.mc146818

0 → 100644
+20 −0
Changes for drivers/mfd/Kconfig.mc146818: 20 added lines, 0 removed lines.
Original line number Diff line number Diff line 
# Intel SoC RTC configuration options



# Copyright (c) 2025 Intel Corporation

# SPDX-License-Identifier: Apache-2.0



config MFD_MOTOROLA_MC146818

	bool "MOTOROLA MC146818 multi-function device driver"

	default y

	depends on DT_HAS_MOTOROLA_MC146818_MFD_ENABLED

	help

	  common code required by bbram and rtc, which will likely be a locking mechanism

	  so both RTC and BBRAM can set/get regs safely and independently.



config MFD_MOTOROLA_MC146818_INIT_PRIORITY

	int "Init priority of mc146818 MFD"

	depends on MFD_MOTOROLA_MC146818

	default 50

	help

	  Initialization priority for the MOTOROLA MC146818 MFD driver.

	  It must be greater than RTC, COUNTER and BBRAM driver init priority.

drivers/mfd/mfd_mc146818.c

0 → 100644
+86 −0
Changes for drivers/mfd/mfd_mc146818.c: 86 added lines, 0 removed lines.
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2025 Intel Corporation.

 *

 * SPDX-License-Identifier: Apache-2.0

 */



#define DT_DRV_COMPAT motorola_mc146818_mfd



#include <zephyr/kernel.h>

#include <zephyr/device.h>

#include <zephyr/spinlock.h>

#include <zephyr/drivers/mfd/mc146818.h>

#include <zephyr/init.h>

#include <zephyr/sys/util.h>

#include <zephyr/devicetree.h>

#include <zephyr/sys/sys_io.h>



#define RTC_STD_INDEX (DT_INST_REG_ADDR_BY_IDX(0, 0))

#define RTC_STD_TARGET (DT_INST_REG_ADDR_BY_IDX(0, 1))

#define RTC_EXT_INDEX (DT_INST_REG_ADDR_BY_IDX(0, 2))

#define RTC_EXT_TARGET (DT_INST_REG_ADDR_BY_IDX(0, 3))



struct mfd_mc146818_data {

	struct k_spinlock lock;

};



uint8_t mfd_mc146818_std_read(const struct device *dev, uint8_t offset)

{

	struct mfd_mc146818_data *data = dev->data;

	uint8_t value;



	k_spinlock_key_t key = k_spin_lock(&data->lock);



	sys_out8(offset, RTC_STD_INDEX);

	value = sys_in8(RTC_STD_TARGET);



	k_spin_unlock(&data->lock, key);

	return value;

}



void mfd_mc146818_std_write(const struct device *dev, uint8_t offset, uint8_t value)

{

	struct mfd_mc146818_data *data = dev->data;



	k_spinlock_key_t key = k_spin_lock(&data->lock);



	sys_out8(offset, RTC_STD_INDEX);

	sys_out8(value, RTC_STD_TARGET);



	k_spin_unlock(&data->lock, key);

}



uint8_t mfd_mc146818_ext_read(const struct device *dev, uint8_t offset)

{

	struct mfd_mc146818_data *data = dev->data;

	uint8_t value;



	k_spinlock_key_t key = k_spin_lock(&data->lock);



	sys_out8(offset, RTC_EXT_INDEX);

	value = sys_in8(RTC_EXT_TARGET);



	k_spin_unlock(&data->lock, key);

	return value;

}



void mfd_mc146818_ext_write(const struct device *dev, uint8_t offset, uint8_t value)

{

	struct mfd_mc146818_data *data = dev->data;



	k_spinlock_key_t key = k_spin_lock(&data->lock);



	sys_out8(offset, RTC_EXT_INDEX);

	sys_out8(value, RTC_EXT_TARGET);



	k_spin_unlock(&data->lock, key);

}



#define MFD_MC146818_DEFINE(inst)						\

	static struct mfd_mc146818_data data##inst;				\

	DEVICE_DT_INST_DEFINE(inst, NULL, NULL, &data##inst, NULL,		\

			      POST_KERNEL,					\

			      CONFIG_MFD_MOTOROLA_MC146818_INIT_PRIORITY,	\

			      NULL);						\



DT_INST_FOREACH_STATUS_OKAY(MFD_MC146818_DEFINE)

dts/bindings/mfd/motorola,mc146818-mfd.yaml

0 → 100644
+34 −0
Changes for dts/bindings/mfd/motorola,mc146818-mfd.yaml: 34 added lines, 0 removed lines.
Original line number Diff line number Diff line 
# Copyright (c) 2025, Intel Corporation

#

# SPDX-License-Identifier: Apache-2.0



description: |

  Motorola MC146818 MFD



  The following example displays the node layout

  with every possible partial driver included.



  mfd: mfd@70 {

    compatible = "motorola,mc146818-mfd";

    reg = <0x70 0x01 0x71 0x01 0x72 0x01 0x73 0x01>;

    rtc: counter: rtc {

      compatible = "motorola,mc146818";

      interrupts = <8 IRQ_TYPE_LOWEST_EDGE_RISING 3>;

      interrupt-parent = <&intc>;

      alarms-count = <1>;



      status = "okay";

    };



    bbram: bbram {

      compatible = "motorola,mc146818-bbram";

      size = <241>;

      status = "okay";

    };

  };



compatible: "motorola,mc146818-mfd"



include: base.yaml



bus: mc146818-mfd

CRA Git | Maintained and supported by SUSTech CRA and CCSE