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drivers: reset: Reset controller driver for STiH416

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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: Stephen Gallimore <stephen.gallimore@st.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Stephen Gallimore 2013-08-07 16:57:26 +01:00 committed by Srinivas Kandagatla
parent 1f42c290c3
commit d0ace0f6e5
3 changed files with 84 additions and 1 deletions
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4
drivers/reset/sti/Kconfig
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@ -8,4 +8,8 @@ config STIH415_RESET
bool
select STI_RESET_SYSCFG
config STIH416_RESET
bool
select STI_RESET_SYSCFG
endif

2
drivers/reset/sti/Makefile
View File

@ -1,4 +1,4 @@
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

79
drivers/reset/sti/reset-stih416.c Normal file
View File

@ -0,0 +1,79 @@
/*
* 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);