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Commit 8f693f99 authored by Arjun Singh's avatar Arjun Singh
Browse files

soc: qcom: bgdaemon: Add support for BG soft reset on Modem down 



When Modem goes down, to re-establish the connections, BG-Daemon
toggles the bg-reset gpio to reset BG.

Change-Id: Idb319fb157e04c78a7db207fa450e5930c1e6dd8
Signed-off-by: default avatarArjun Singh <arsingh@codeaurora.org>
parent 3c177cf9

Documentation/devicetree/bindings/soc/qcom/bg_daemon.txt

0 → 100644
+14 −0
Original line number Diff line number Diff line 
Qualcomm Technologies Inc. bg-daemon



BG-Daemon : When Modem goes down, to re-establish the connections,

BG-Daemon toggles the bg-reset gpio to reset BG.



Required properties:

- compatible : should be "qcom,bg-daemon"

- qcom,bg-reset-gpio : gpio for the apps processor use to soft reset BG



Example:

	qcom,bg-daemon {

		compatible = "qcom,bg-daemon";

		qcom,bg-reset-gpio = <&pm660_gpios 5 0>;

	};

drivers/soc/qcom/bg_rsb.c

+5 −3
Original line number Diff line number Diff line 
/* Copyright (c) 2017, The Linux Foundation. All rights reserved.

/* Copyright (c) 2017-2018, 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
@@ -544,8 +544,6 @@ static void bgrsb_disable_rsb(struct work_struct *work) 
								rsb_down_work);



	if (dev->bgrsb_current_state == BGRSB_STATE_RSB_ENABLED) {

		if (bgrsb_ldo_work(dev, BGRSB_DISABLE_LDO15) != 0)

			return;



		req.cmd_id = 0x02;

		req.data = 0x00;
@@ -555,6 +553,10 @@ static void bgrsb_disable_rsb(struct work_struct *work) 
			pr_err("Failed to send disable command to BG\n");

			return;

		}



		if (bgrsb_ldo_work(dev, BGRSB_DISABLE_LDO15) != 0)

			return;



		dev->bgrsb_current_state = BGRSB_STATE_RSB_CONFIGURED;

		pr_debug("RSB Disabled\n");

	}

drivers/soc/qcom/bgcom_interface.c

+68 −0
Original line number Diff line number Diff line
@@ -27,6 +27,11 @@ 
#include <soc/qcom/subsystem_notif.h>

#include "bgcom.h"

#include "linux/bgcom_interface.h"

#include <linux/of.h>

#include <linux/of_gpio.h>

#include <linux/gpio.h>

#include <linux/delay.h>

#include <linux/platform_device.h>



#define BGCOM "bg_com_dev"
@@ -52,6 +57,8 @@ static char *ssr_domains[] = { 
	"modem",

};



static unsigned bgreset_gpio;



static  DEFINE_MUTEX(bg_char_mutex);

static  struct cdev              bg_cdev;

static  struct class             *bg_class;
@@ -169,6 +176,15 @@ static int bgchar_write_cmd(struct bg_ui_data *fui_obj_msg, int type) 
	return ret;

}



static int bg_soft_reset(void)

{

	/*pull down reset gpio */

	gpio_direction_output(bgreset_gpio, 0);

	msleep(50);

	gpio_set_value(bgreset_gpio, 1);

	return 0;

}



static long bg_com_ioctl(struct file *filp,

		unsigned int ui_bgcom_cmd, unsigned long arg)

{
@@ -205,6 +221,9 @@ static long bg_com_ioctl(struct file *filp, 
	case SET_SPI_BUSY:

		ret = bgcom_set_spi_state(BGCOM_SPI_BUSY);

		break;

	case BG_SOFT_RESET:

		ret = bg_soft_reset();

		break;

	default:

		ret = -ENOIOCTLCMD;

	}
@@ -222,6 +241,50 @@ static int bgcom_char_close(struct inode *inode, struct file *file) 
	return ret;

}



static int bg_daemon_probe(struct platform_device *pdev)

{

	struct device_node *node;

	unsigned reset_gpio;



	node = pdev->dev.of_node;



	reset_gpio = of_get_named_gpio(node, "qcom,bg-reset-gpio", 0);

	if (!gpio_is_valid(reset_gpio)) {

		pr_err("gpio %d found is not valid\n", reset_gpio);

		goto err_ret;

	}



	if (gpio_request(reset_gpio, "bg_reset_gpio")) {

		pr_err("gpio %d request failed\n", reset_gpio);

		goto err_ret;

	}



	if (gpio_direction_output(reset_gpio, 1)) {

		pr_err("gpio %d direction not set\n", reset_gpio);

		goto err_ret;

	}



	pr_info("bg-soft-reset gpio successfully requested\n");

	bgreset_gpio = reset_gpio;



err_ret:

	return 0;

}



static const struct of_device_id bg_daemon_of_match[] = {

	{ .compatible = "qcom,bg-daemon", },

	{ }

};

MODULE_DEVICE_TABLE(of, bg_daemon_of_match);



static struct platform_driver bg_daemon_driver = {

	.probe  = bg_daemon_probe,

	.driver = {

		.name = "bg-daemon",

		.of_match_table = bg_daemon_of_match,

	},

};



static const struct file_operations fops = {

	.owner          = THIS_MODULE,

	.open           = bgcom_char_open,
@@ -261,6 +324,10 @@ static int __init init_bg_com_dev(void) 
		pr_err("device create failed\n");

		return PTR_ERR(dev_ret);

	}



	if (platform_driver_register(&bg_daemon_driver))

		pr_err("%s: failed to register bg-daemon register\n", __func__);



	return 0;

}
@@ -270,6 +337,7 @@ static void __exit exit_bg_com_dev(void) 
	class_destroy(bg_class);

	cdev_del(&bg_cdev);

	unregister_chrdev_region(bg_dev, 1);

	platform_driver_unregister(&bg_daemon_driver);

}



/**

include/uapi/linux/bgcom_interface.h

+4 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
#define BGCOM_SET_SPI_FREE  3

#define BGCOM_SET_SPI_BUSY  4

#define BGCOM_REG_WRITE  5

#define BGCOM_SOFT_RESET  6

#define EXCHANGE_CODE  'V'



struct bg_ui_data {
@@ -41,4 +42,7 @@ enum bg_event_type { 
#define REG_WRITE \

	_IOWR(EXCHANGE_CODE, BGCOM_REG_WRITE, \

	struct bg_ui_data)

#define BG_SOFT_RESET \

	_IOWR(EXCHANGE_CODE, BGCOM_SOFT_RESET, \

	struct bg_ui_data)

#endif