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Commit 67b66a5e authored by Isaac J. Manjarres's avatar Isaac J. Manjarres
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soc: qcom: aop_ddrss_cmds: Add support to send DDRSS cmds to AOP 



Introduce a driver to communicate with the AOP to change
the behavior of the DDRSS at boot.

Change-Id: I2f3f3d9fcc582555a4112b68a2ebff38f57b4c35
Signed-off-by: default avatarIsaac J. Manjarres <isaacm@codeaurora.org>
parent e37c51b4

Documentation/devicetree/bindings/arm/msm/msm_aop_ddrss_cmd.txt

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+19 −0
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AOP (Always-On-Processor) DDRSS Commands



The AOP DDRSS commands driver is used to send commands

to the AOP, using the mailbox interface, to affect the

behavior of the DDR.



Required properties



- compatible : "qcom,aop-ddrss-cmds"

- mbox : QMP mailbox phandle and channel identifier



Optional properties:

-mbox-name: name of the mailbox



Example:

	qcom,aop-ddrss-cmds {

		compatible = "qcom,aop-ddrss-cmds";

		mboxes = <&qmp_aop 0>;

	};

drivers/soc/qcom/Kconfig

+6 −0
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@@ -888,6 +888,12 @@ config QCOM_AOP_DDR_MESSAGING 
	  This driver sends messages to the AOP to adjust the DDR frequency when

	  the device is rebooting, to ensure that the device is powered off

	  cleanly.



config QCOM_AOP_DDRSS_COMMANDS

	bool "Send commands to AOP to affect the behavior of the DDRSS"

	help

	  This driver allows messages to be sent to the AOP to affect the DDRSS

	  behavior.

endmenu



config QCOM_HYP_CORE_CTL

drivers/soc/qcom/Makefile

+1 −0
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@@ -100,3 +100,4 @@ obj-$(CONFIG_QCOM_CX_IPEAK) += cx_ipeak.o 
obj-$(CONFIG_QCOM_AOP_DDR_MESSAGING) += aop_ddr_msgs.o

obj-$(CONFIG_MSM_HAB) += hab/

obj-$(CONFIG_QCOM_HYP_CORE_CTL) += hyp_core_ctl.o

obj-$(CONFIG_QCOM_AOP_DDRSS_COMMANDS) += aop_ddrss_cmds.o

drivers/soc/qcom/aop_ddrss_cmds.c

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/* Copyright (c) 2019, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/module.h>

#include <linux/mailbox_client.h>

#include <linux/mailbox/qmp.h>



#define MAX_AOP_MSG_LEN			96



static void send_aop_ddrss_cmd(struct mbox_chan *aop_mbox)

{

	struct qmp_pkt pkt;

	char mbox_msg[MAX_AOP_MSG_LEN + 1] = {0};

	int rc;



	strlcpy(mbox_msg, "{class: ddr, perfmode: on}", MAX_AOP_MSG_LEN);

	pkt.size = MAX_AOP_MSG_LEN;

	pkt.data = mbox_msg;



	rc = mbox_send_message(aop_mbox, &pkt);



	if (rc < 0)

		pr_err("Failed to send AOP DDRSS command\n");

}



static int aop_ddrss_cmd_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct mbox_client cl = {0};

	struct mbox_chan *aop_mbox;

	int rc = 0;



	cl.dev = dev;

	cl.tx_block = true;

	cl.tx_tout = 1000;

	cl.knows_txdone = false;

	aop_mbox = mbox_request_channel(&cl, 0);

	if (IS_ERR(aop_mbox)) {

		rc = PTR_ERR(aop_mbox);

		pr_err("Failed to get mailbox channel rc: %d\n", rc);

		return rc;

	}



	send_aop_ddrss_cmd(aop_mbox);

	mbox_free_channel(aop_mbox);



	return rc;

}



static const struct of_device_id of_aop_ddrss_cmd_match_tbl[] = {

	{ .compatible = "qcom,aop-ddrss-cmds", },

	{},

};

MODULE_DEVICE_TABLE(of, of_aop_ddrss_cmd_match_tbl);



static struct platform_driver aop_ddrss_cmd_driver = {

	.probe = aop_ddrss_cmd_probe,

	.driver = {

		.name = "aop-ddrss-cmds",

		.of_match_table = of_match_ptr(of_aop_ddrss_cmd_match_tbl),

	},

};

module_platform_driver(aop_ddrss_cmd_driver);



MODULE_DESCRIPTION("QTI AOP DDRSS Commands driver");

MODULE_LICENSE("GPL v2");