Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 1f42c290 authored by Stephen Gallimore's avatar Stephen Gallimore Committed by Srinivas Kandagatla
Browse files

drivers: reset: Reset controller driver for STiH415 



This patch adds a reset controller platform driver for the STiH415
SoC. This initial version provides a compatible driver for the
"st,stih415-powerdown" device, which registers a system configuration
register based reset controller that controls the powerdown state of
hardware such as the on-chip USB host controllers.

Signed-off-by: default avatarStephen Gallimore <stephen.gallimore@st.com>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@st.com>
Acked-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent e5d76075

drivers/reset/sti/Kconfig

+4 −0
Original line number Original line Diff line number Diff line
@@ -4,4 +4,8 @@ config STI_RESET_SYSCFG 
	bool

	bool

	select RESET_CONTROLLER

	select RESET_CONTROLLER





config STIH415_RESET

	bool

	select STI_RESET_SYSCFG



endif
 
endif

drivers/reset/sti/Makefile

+3 −0
Original line number Original line Diff line number Diff line 
obj-$(CONFIG_STI_RESET_SYSCFG) += reset-syscfg.o

obj-$(CONFIG_STI_RESET_SYSCFG) += reset-syscfg.o



# SoC specific reset devices

obj-$(CONFIG_STIH415_RESET) += reset-stih415.o

drivers/reset/sti/reset-stih415.c

0 → 100644
+77 −0
Original line number Original line Diff line number Diff line 
/*

 * Copyright (C) 2013 STMicroelectronics (R&D) Limited

 * Author: Stephen Gallimore <stephen.gallimore@st.com>

 * Author: Srinivas Kandagatla <srinivas.kandagatla@st.com>

 *

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 */

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>



#include <dt-bindings/reset-controller/stih415-resets.h>



#include "reset-syscfg.h"



/*

 * STiH415 Peripheral powerdown definitions.

 */

static const char stih415_front[] = "st,stih415-front-syscfg";

static const char stih415_rear[] = "st,stih415-rear-syscfg";

static const char stih415_sbc[] = "st,stih415-sbc-syscfg";

static const char stih415_lpm[] = "st,stih415-lpm-syscfg";



#define STIH415_PDN_FRONT(_bit) \

	_SYSCFG_RST_CH(stih415_front, SYSCFG_114, _bit, SYSSTAT_187, _bit)



#define STIH415_PDN_REAR(_cntl, _stat) \

	_SYSCFG_RST_CH(stih415_rear, SYSCFG_336, _cntl, SYSSTAT_384, _stat)



#define SYSCFG_114	0x38 /* Powerdown request EMI/NAND/Keyscan */

#define SYSSTAT_187	0x15c /* Powerdown status EMI/NAND/Keyscan */



#define SYSCFG_336	0x90 /* Powerdown request USB/SATA/PCIe */

#define SYSSTAT_384	0x150 /* Powerdown status USB/SATA/PCIe */



static const struct syscfg_reset_channel_data stih415_powerdowns[] = {

	[STIH415_EMISS_POWERDOWN]	= STIH415_PDN_FRONT(0),

	[STIH415_NAND_POWERDOWN]	= STIH415_PDN_FRONT(1),

	[STIH415_KEYSCAN_POWERDOWN]	= STIH415_PDN_FRONT(2),

	[STIH415_USB0_POWERDOWN]	= STIH415_PDN_REAR(0, 0),

	[STIH415_USB1_POWERDOWN]	= STIH415_PDN_REAR(1, 1),

	[STIH415_USB2_POWERDOWN]	= STIH415_PDN_REAR(2, 2),

	[STIH415_SATA0_POWERDOWN]	= STIH415_PDN_REAR(3, 3),

	[STIH415_SATA1_POWERDOWN]	= STIH415_PDN_REAR(4, 4),

	[STIH415_PCIE_POWERDOWN]	= STIH415_PDN_REAR(5, 8),

};



static struct syscfg_reset_controller_data stih415_powerdown_controller = {

	.wait_for_ack = true,

	.nr_channels = ARRAY_SIZE(stih415_powerdowns),

	.channels = stih415_powerdowns,

};



static struct of_device_id stih415_reset_match[] = {

	{ .compatible = "st,stih415-powerdown",

	  .data = &stih415_powerdown_controller, },

	{},

};



static struct platform_driver stih415_reset_driver = {

	.probe = syscfg_reset_probe,

	.driver = {

		.name = "reset-stih415",

		.owner = THIS_MODULE,

		.of_match_table = stih415_reset_match,

	},

};



static int __init stih415_reset_init(void)

{

	return platform_driver_register(&stih415_reset_driver);

}

arch_initcall(stih415_reset_init);