diff options
| -rw-r--r-- | Documentation/devicetree/bindings/reset/oxnas,reset.txt | 58 | ||||
| -rw-r--r-- | drivers/reset/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/reset/reset-oxnas.c | 136 | ||||
| -rw-r--r-- | include/linux/reset.h | 6 |
5 files changed, 204 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/reset/oxnas,reset.txt b/Documentation/devicetree/bindings/reset/oxnas,reset.txt new file mode 100644 index 000000000000..6f06db930030 --- /dev/null +++ b/Documentation/devicetree/bindings/reset/oxnas,reset.txt @@ -0,0 +1,58 @@ +Oxford Semiconductor OXNAS SoC Family RESET Controller +================================================ + +Please also refer to reset.txt in this directory for common reset +controller binding usage. + +Required properties: +- compatible: Should be "oxsemi,ox810se-reset" +- #reset-cells: 1, see below + +Parent node should have the following properties : +- compatible: Should be "oxsemi,ox810se-sys-ctrl", "syscon", "simple-mfd" + +For OX810SE, the indices are : + - 0 : ARM + - 1 : COPRO + - 2 : Reserved + - 3 : Reserved + - 4 : USBHS + - 5 : USBHSPHY + - 6 : MAC + - 7 : PCI + - 8 : DMA + - 9 : DPE + - 10 : DDR + - 11 : SATA + - 12 : SATA_LINK + - 13 : SATA_PHY + - 14 : Reserved + - 15 : NAND + - 16 : GPIO + - 17 : UART1 + - 18 : UART2 + - 19 : MISC + - 20 : I2S + - 21 : AHB_MON + - 22 : UART3 + - 23 : UART4 + - 24 : SGDMA + - 25 : Reserved + - 26 : Reserved + - 27 : Reserved + - 28 : Reserved + - 29 : Reserved + - 30 : Reserved + - 31 : BUS + +example: + +sys: sys-ctrl@000000 { + compatible = "oxsemi,ox810se-sys-ctrl", "syscon", "simple-mfd"; + reg = <0x000000 0x100000>; + + reset: reset-controller { + compatible = "oxsemi,ox810se-reset"; + #reset-cells = <1>; + }; +}; diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index df37212a5cbd..0b2733db0e9e 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -12,5 +12,8 @@ menuconfig RESET_CONTROLLER If unsure, say no. +config RESET_OXNAS + bool + source "drivers/reset/sti/Kconfig" source "drivers/reset/hisilicon/Kconfig" diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index a1fc8eda79f3..f173fc3847b4 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_ARCH_STI) += sti/ obj-$(CONFIG_ARCH_HISI) += hisilicon/ obj-$(CONFIG_ARCH_ZYNQ) += reset-zynq.o obj-$(CONFIG_ATH79) += reset-ath79.o +obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o diff --git a/drivers/reset/reset-oxnas.c b/drivers/reset/reset-oxnas.c new file mode 100644 index 000000000000..c60fb2dace3e --- /dev/null +++ b/drivers/reset/reset-oxnas.c @@ -0,0 +1,136 @@ +/* + * drivers/reset/reset-oxnas.c + * + * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com> + * Copyright (C) 2014 Ma Haijun <mahaijuns@gmail.com> + * Copyright (C) 2009 Oxford Semiconductor Ltd + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <linux/err.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/reset-controller.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/types.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> + +/* Regmap offsets */ +#define RST_SET_REGOFFSET 0x34 +#define RST_CLR_REGOFFSET 0x38 + +struct oxnas_reset { + struct regmap *regmap; + struct reset_controller_dev rcdev; +}; + +static int oxnas_reset_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct oxnas_reset *data = + container_of(rcdev, struct oxnas_reset, rcdev); + + regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id)); + msleep(50); + regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id)); + + return 0; +} + +static int oxnas_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct oxnas_reset *data = + container_of(rcdev, struct oxnas_reset, rcdev); + + regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id)); + + return 0; +} + +static int oxnas_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct oxnas_reset *data = + container_of(rcdev, struct oxnas_reset, rcdev); + + regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id)); + + return 0; +} + +static const struct reset_control_ops oxnas_reset_ops = { + .reset = oxnas_reset_reset, + .assert = oxnas_reset_assert, + .deassert = oxnas_reset_deassert, +}; + +static const struct of_device_id oxnas_reset_dt_ids[] = { + { .compatible = "oxsemi,ox810se-reset", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, oxnas_reset_dt_ids); + +static int oxnas_reset_probe(struct platform_device *pdev) +{ + struct oxnas_reset *data; + struct device *parent; + + parent = pdev->dev.parent; + if (!parent) { + dev_err(&pdev->dev, "no parent\n"); + return -ENODEV; + } + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = syscon_node_to_regmap(parent->of_node); + if (IS_ERR(data->regmap)) { + dev_err(&pdev->dev, "failed to get parent regmap\n"); + return PTR_ERR(data->regmap); + } + + platform_set_drvdata(pdev, data); + + data->rcdev.owner = THIS_MODULE; + data->rcdev.nr_resets = 32; + data->rcdev.ops = &oxnas_reset_ops; + data->rcdev.of_node = pdev->dev.of_node; + + return reset_controller_register(&data->rcdev); +} + +static int oxnas_reset_remove(struct platform_device *pdev) +{ + struct oxnas_reset *data = platform_get_drvdata(pdev); + + reset_controller_unregister(&data->rcdev); + + return 0; +} + +static struct platform_driver oxnas_reset_driver = { + .probe = oxnas_reset_probe, + .remove = oxnas_reset_remove, + .driver = { + .name = "oxnas-reset", + .of_match_table = oxnas_reset_dt_ids, + }, +}; + +module_platform_driver(oxnas_reset_driver); diff --git a/include/linux/reset.h b/include/linux/reset.h index a552134a209e..ec0306ce7b92 100644 --- a/include/linux/reset.h +++ b/include/linux/reset.h @@ -56,6 +56,12 @@ static inline void reset_control_put(struct reset_control *rstc) WARN_ON(1); } +static inline int __must_check device_reset(struct device *dev) +{ + WARN_ON(1); + return -ENOTSUPP; +} + static inline int device_reset_optional(struct device *dev) { return -ENOTSUPP; |