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Commit d0ace0f6 authored by Stephen Gallimore's avatar Stephen Gallimore Committed by Srinivas Kandagatla
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drivers: reset: Reset controller driver for STiH416 



This patch adds a reset controller platform driver for the STiH416
SoC. This initial version provides a compatible driver for the
"st,stih416-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 1f42c290

drivers/reset/sti/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -8,4 +8,8 @@ config STIH415_RESET 
	bool

	select STI_RESET_SYSCFG



config STIH416_RESET

	bool

	select STI_RESET_SYSCFG



endif

drivers/reset/sti/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-$(CONFIG_STI_RESET_SYSCFG) += reset-syscfg.o



# SoC specific reset devices

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

obj-$(CONFIG_STIH416_RESET) += reset-stih416.o

drivers/reset/sti/reset-stih416.c

0 → 100644
+79 −0
Original line number 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/stih416-resets.h>



#include "reset-syscfg.h"



/*

 * STiH416 Peripheral powerdown definitions.

 */

static const char stih416_front[] = "st,stih416-front-syscfg";

static const char stih416_rear[] = "st,stih416-rear-syscfg";

static const char stih416_sbc[] = "st,stih416-sbc-syscfg";

static const char stih416_lpm[] = "st,stih416-lpm-syscfg";



#define STIH416_PDN_FRONT(_bit) \

	_SYSCFG_RST_CH(stih416_front, SYSCFG_1500, _bit, SYSSTAT_1578, _bit)



#define STIH416_PDN_REAR(_cntl, _stat) \

	_SYSCFG_RST_CH(stih416_rear, SYSCFG_2525, _cntl, SYSSTAT_2583, _stat)



#define SYSCFG_1500	0x7d0 /* Powerdown request EMI/NAND/Keyscan */

#define SYSSTAT_1578	0x908 /* Powerdown status EMI/NAND/Keyscan */



#define SYSCFG_2525	0x834 /* Powerdown request USB/SATA/PCIe */

#define SYSSTAT_2583	0x91c /* Powerdown status USB/SATA/PCIe */



static const struct syscfg_reset_channel_data stih416_powerdowns[] = {

	[STIH416_EMISS_POWERDOWN]	= STIH416_PDN_FRONT(0),

	[STIH416_NAND_POWERDOWN]	= STIH416_PDN_FRONT(1),

	[STIH416_KEYSCAN_POWERDOWN]	= STIH416_PDN_FRONT(2),

	[STIH416_USB0_POWERDOWN]	= STIH416_PDN_REAR(0, 0),

	[STIH416_USB1_POWERDOWN]	= STIH416_PDN_REAR(1, 1),

	[STIH416_USB2_POWERDOWN]	= STIH416_PDN_REAR(2, 2),

	[STIH416_USB3_POWERDOWN]	= STIH416_PDN_REAR(6, 5),

	[STIH416_SATA0_POWERDOWN]	= STIH416_PDN_REAR(3, 3),

	[STIH416_SATA1_POWERDOWN]	= STIH416_PDN_REAR(4, 4),

	[STIH416_PCIE0_POWERDOWN]	= STIH416_PDN_REAR(7, 9),

	[STIH416_PCIE1_POWERDOWN]	= STIH416_PDN_REAR(5, 8),

};



static struct syscfg_reset_controller_data stih416_powerdown_controller = {

	.wait_for_ack	= true,

	.nr_channels	= ARRAY_SIZE(stih416_powerdowns),

	.channels	= stih416_powerdowns,

};



static struct of_device_id stih416_reset_match[] = {

	{ .compatible = "st,stih416-powerdown",

	  .data = &stih416_powerdown_controller, },

	{},

};



static struct platform_driver stih416_reset_driver = {

	.probe = syscfg_reset_probe,

	.driver = {

		.name = "reset-stih416",

		.owner = THIS_MODULE,

		.of_match_table = stih416_reset_match,

	},

};



static int __init stih416_reset_init(void)

{

	return platform_driver_register(&stih416_reset_driver);

}

arch_initcall(stih416_reset_init);