| Message ID | 20170819221823.13850-11-hauke@hauke-m.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Sun, Aug 20, 2017 at 12:18 AM, Hauke Mehrtens <hauke@hauke-m.de> wrote: > From: Martin Blumenstingl <martin.blumenstingl@googlemail.com> > > The reset controllers (on xRX200 and newer SoCs have two of them) are > provided by the RCU module. This was initially implemented as a simple > reset controller. However, the RCU module provides more functionality > (ethernet GPHYs, USB PHY, etc.), which makes it a MFD device. > The old reset controller driver implementation from > arch/mips/lantiq/xway/reset.c did not honor this fact. > > For some devices the request and the status bits are different. > > Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> > Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> > Acked-by: Philipp Zabel <p.zabel@pengutronix.de> > Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> thank you Hauke for pushing this! > --- > .../devicetree/bindings/reset/lantiq,reset.txt | 30 +++ > drivers/reset/Kconfig | 6 + > drivers/reset/Makefile | 1 + > drivers/reset/reset-lantiq.c | 212 +++++++++++++++++++++ > 4 files changed, 249 insertions(+) > create mode 100644 Documentation/devicetree/bindings/reset/lantiq,reset.txt > create mode 100644 drivers/reset/reset-lantiq.c > > diff --git a/Documentation/devicetree/bindings/reset/lantiq,reset.txt b/Documentation/devicetree/bindings/reset/lantiq,reset.txt > new file mode 100644 > index 000000000000..c6aef36b7d15 > --- /dev/null > +++ b/Documentation/devicetree/bindings/reset/lantiq,reset.txt > @@ -0,0 +1,30 @@ > +Lantiq XWAY SoC RCU reset controller binding > +============================================ > + > +This binding describes a reset-controller found on the RCU module on Lantiq > +XWAY SoCs. > + > +This node has to be a sub node of the Lantiq RCU block. > + > +------------------------------------------------------------------------------- > +Required properties: > +- compatible : Should be one of > + "lantiq,danube-reset" > + "lantiq,xrx200-reset" > +- reg : Defines the following sets of registers in the parent > + syscon device > + - Offset of the reset set register > + - Offset of the reset status register > +- #reset-cells : Specifies the number of cells needed to encode the > + reset line, should be 2. > + The first cell takes the reset set bit and the > + second cell takes the status bit. > + > +------------------------------------------------------------------------------- > +Example for the reset-controllers on the xRX200 SoCs: > + reset0: reset-controller@10 { > + compatible = "lantiq,xrx200-reset"; > + reg <0x10 0x04>, <0x14 0x04>; > + > + #reset-cells = <2>; > + }; > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig > index 608c071e4bbf..4172ea1827f8 100644 > --- a/drivers/reset/Kconfig > +++ b/drivers/reset/Kconfig > @@ -48,6 +48,12 @@ config RESET_IMX7 > help > This enables the reset controller driver for i.MX7 SoCs. > > +config RESET_LANTIQ > + bool "Lantiq XWAY Reset Driver" if COMPILE_TEST > + default SOC_TYPE_XWAY > + help > + This enables the reset controller driver for Lantiq / Intel XWAY SoCs. > + > config RESET_LPC18XX > bool "LPC18xx/43xx Reset Driver" if COMPILE_TEST > default ARCH_LPC18XX > diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile > index 7081f9da2599..54d8b3f703f2 100644 > --- a/drivers/reset/Makefile > +++ b/drivers/reset/Makefile > @@ -7,6 +7,7 @@ obj-$(CONFIG_RESET_ATH79) += reset-ath79.o > obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o > obj-$(CONFIG_RESET_GEMINI) += reset-gemini.o > obj-$(CONFIG_RESET_IMX7) += reset-imx7.o > +obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o > obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o > obj-$(CONFIG_RESET_MESON) += reset-meson.o > obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o > diff --git a/drivers/reset/reset-lantiq.c b/drivers/reset/reset-lantiq.c > new file mode 100644 > index 000000000000..11a582e50d30 > --- /dev/null > +++ b/drivers/reset/reset-lantiq.c > @@ -0,0 +1,212 @@ > +/* > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License version 2 as published > + * by the Free Software Foundation. > + * > + * Copyright (C) 2010 John Crispin <blogic@phrozen.org> > + * Copyright (C) 2013-2015 Lantiq Beteiligungs-GmbH & Co.KG > + * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com> > + * Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de> > + */ > + > +#include <linux/mfd/syscon.h> > +#include <linux/module.h> > +#include <linux/regmap.h> > +#include <linux/reset-controller.h> > +#include <linux/of_address.h> > +#include <linux/of_platform.h> > +#include <linux/platform_device.h> > +#include <linux/property.h> > + > +#define LANTIQ_RCU_RESET_TIMEOUT 10000 > + > +struct lantiq_rcu_reset_priv { > + struct reset_controller_dev rcdev; > + struct device *dev; > + struct regmap *regmap; > + u32 reset_offset; > + u32 status_offset; > +}; > + > +static struct lantiq_rcu_reset_priv *to_lantiq_rcu_reset_priv( > + struct reset_controller_dev *rcdev) > +{ > + return container_of(rcdev, struct lantiq_rcu_reset_priv, rcdev); > +} > + > +static int lantiq_rcu_reset_status(struct reset_controller_dev *rcdev, > + unsigned long id) > +{ > + struct lantiq_rcu_reset_priv *priv = to_lantiq_rcu_reset_priv(rcdev); > + unsigned int status = (id >> 8) & 0x1f; > + u32 val; > + int ret; > + > + ret = regmap_read(priv->regmap, priv->status_offset, &val); > + if (ret) > + return ret; > + > + return !!(val & BIT(status)); > +} > + > +static int lantiq_rcu_reset_status_timeout(struct reset_controller_dev *rcdev, > + unsigned long id, bool assert) > +{ > + int ret; > + int retry = LANTIQ_RCU_RESET_TIMEOUT; > + > + do { > + ret = lantiq_rcu_reset_status(rcdev, id); > + if (ret < 0) > + return ret; > + if (ret == assert) > + return 0; > + usleep_range(20, 40); > + } while (--retry); > + > + return -ETIMEDOUT; > +} > + > +static int lantiq_rcu_reset_update(struct reset_controller_dev *rcdev, > + unsigned long id, bool assert) > +{ > + struct lantiq_rcu_reset_priv *priv = to_lantiq_rcu_reset_priv(rcdev); > + unsigned int set = id & 0x1f; > + u32 val = assert ? BIT(set) : 0; > + int ret; > + > + ret = regmap_update_bits(priv->regmap, priv->reset_offset, BIT(set), > + val); > + if (ret) { > + dev_err(priv->dev, "Failed to set reset bit %u\n", set); > + return ret; > + } > + > + > + ret = lantiq_rcu_reset_status_timeout(rcdev, id, assert); > + if (ret) > + dev_err(priv->dev, "Failed to %s bit %u\n", > + assert ? "assert" : "deassert", set); > + > + return ret; > +} > + > +static int lantiq_rcu_reset_assert(struct reset_controller_dev *rcdev, > + unsigned long id) > +{ > + return lantiq_rcu_reset_update(rcdev, id, true); > +} > + > +static int lantiq_rcu_reset_deassert(struct reset_controller_dev *rcdev, > + unsigned long id) > +{ > + return lantiq_rcu_reset_update(rcdev, id, false); > +} > + > +static int lantiq_rcu_reset_reset(struct reset_controller_dev *rcdev, > + unsigned long id) > +{ > + int ret; > + > + ret = lantiq_rcu_reset_assert(rcdev, id); > + if (ret) > + return ret; > + > + return lantiq_rcu_reset_deassert(rcdev, id); > +} > + > +static const struct reset_control_ops lantiq_rcu_reset_ops = { > + .assert = lantiq_rcu_reset_assert, > + .deassert = lantiq_rcu_reset_deassert, > + .status = lantiq_rcu_reset_status, > + .reset = lantiq_rcu_reset_reset, > +}; > + > +static int lantiq_rcu_reset_of_parse(struct platform_device *pdev, > + struct lantiq_rcu_reset_priv *priv) > +{ > + struct device *dev = &pdev->dev; > + const __be32 *offset; > + > + priv->regmap = syscon_node_to_regmap(dev->of_node->parent); > + if (IS_ERR(priv->regmap)) { > + dev_err(&pdev->dev, "Failed to lookup RCU regmap\n"); > + return PTR_ERR(priv->regmap); > + } > + > + offset = of_get_address(dev->of_node, 0, NULL, NULL); > + if (!offset) { > + dev_err(&pdev->dev, "Failed to get RCU reset offset\n"); > + return -ENOENT; > + } > + priv->reset_offset = __be32_to_cpu(*offset); > + > + offset = of_get_address(dev->of_node, 1, NULL, NULL); > + if (!offset) { > + dev_err(&pdev->dev, "Failed to get RCU status offset\n"); > + return -ENOENT; > + } > + priv->status_offset = __be32_to_cpu(*offset); > + > + return 0; > +} > + > +static int lantiq_rcu_reset_xlate(struct reset_controller_dev *rcdev, > + const struct of_phandle_args *reset_spec) > +{ > + unsigned int status, set; > + > + set = reset_spec->args[0]; > + status = reset_spec->args[1]; > + > + if (set >= rcdev->nr_resets || status >= rcdev->nr_resets) > + return -EINVAL; > + > + return (status << 8) | set; > +} > + > +static int lantiq_rcu_reset_probe(struct platform_device *pdev) > +{ > + struct lantiq_rcu_reset_priv *priv; > + int err; > + > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + priv->dev = &pdev->dev; > + platform_set_drvdata(pdev, priv); > + > + err = lantiq_rcu_reset_of_parse(pdev, priv); > + if (err) > + return err; > + > + priv->rcdev.ops = &lantiq_rcu_reset_ops; > + priv->rcdev.owner = THIS_MODULE; > + priv->rcdev.of_node = pdev->dev.of_node; > + priv->rcdev.nr_resets = 32; > + priv->rcdev.of_xlate = lantiq_rcu_reset_xlate; > + priv->rcdev.of_reset_n_cells = 2; > + > + return reset_controller_register(&priv->rcdev); > +} > + > +static const struct of_device_id lantiq_rcu_reset_dt_ids[] = { > + { .compatible = "lantiq,danube-reset", }, > + { .compatible = "lantiq,xrx200-reset", }, > + { }, > +}; > +MODULE_DEVICE_TABLE(of, lantiq_rcu_reset_dt_ids); > + > +static struct platform_driver lantiq_rcu_reset_driver = { > + .probe = lantiq_rcu_reset_probe, > + .driver = { > + .name = "lantiq-reset", > + .of_match_table = lantiq_rcu_reset_dt_ids, > + }, > +}; > +module_platform_driver(lantiq_rcu_reset_driver); > + > +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); > +MODULE_DESCRIPTION("Lantiq XWAY RCU Reset Controller Driver"); > +MODULE_LICENSE("GPL"); > -- > 2.11.0 > -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/reset/lantiq,reset.txt b/Documentation/devicetree/bindings/reset/lantiq,reset.txt new file mode 100644 index 000000000000..c6aef36b7d15 --- /dev/null +++ b/Documentation/devicetree/bindings/reset/lantiq,reset.txt @@ -0,0 +1,30 @@ +Lantiq XWAY SoC RCU reset controller binding +============================================ + +This binding describes a reset-controller found on the RCU module on Lantiq +XWAY SoCs. + +This node has to be a sub node of the Lantiq RCU block. + +------------------------------------------------------------------------------- +Required properties: +- compatible : Should be one of + "lantiq,danube-reset" + "lantiq,xrx200-reset" +- reg : Defines the following sets of registers in the parent + syscon device + - Offset of the reset set register + - Offset of the reset status register +- #reset-cells : Specifies the number of cells needed to encode the + reset line, should be 2. + The first cell takes the reset set bit and the + second cell takes the status bit. + +------------------------------------------------------------------------------- +Example for the reset-controllers on the xRX200 SoCs: + reset0: reset-controller@10 { + compatible = "lantiq,xrx200-reset"; + reg <0x10 0x04>, <0x14 0x04>; + + #reset-cells = <2>; + }; diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 608c071e4bbf..4172ea1827f8 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -48,6 +48,12 @@ config RESET_IMX7 help This enables the reset controller driver for i.MX7 SoCs. +config RESET_LANTIQ + bool "Lantiq XWAY Reset Driver" if COMPILE_TEST + default SOC_TYPE_XWAY + help + This enables the reset controller driver for Lantiq / Intel XWAY SoCs. + config RESET_LPC18XX bool "LPC18xx/43xx Reset Driver" if COMPILE_TEST default ARCH_LPC18XX diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 7081f9da2599..54d8b3f703f2 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_RESET_ATH79) += reset-ath79.o obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o obj-$(CONFIG_RESET_GEMINI) += reset-gemini.o obj-$(CONFIG_RESET_IMX7) += reset-imx7.o +obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o obj-$(CONFIG_RESET_MESON) += reset-meson.o obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o diff --git a/drivers/reset/reset-lantiq.c b/drivers/reset/reset-lantiq.c new file mode 100644 index 000000000000..11a582e50d30 --- /dev/null +++ b/drivers/reset/reset-lantiq.c @@ -0,0 +1,212 @@ +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Copyright (C) 2010 John Crispin <blogic@phrozen.org> + * Copyright (C) 2013-2015 Lantiq Beteiligungs-GmbH & Co.KG + * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + * Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de> + */ + +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/reset-controller.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/property.h> + +#define LANTIQ_RCU_RESET_TIMEOUT 10000 + +struct lantiq_rcu_reset_priv { + struct reset_controller_dev rcdev; + struct device *dev; + struct regmap *regmap; + u32 reset_offset; + u32 status_offset; +}; + +static struct lantiq_rcu_reset_priv *to_lantiq_rcu_reset_priv( + struct reset_controller_dev *rcdev) +{ + return container_of(rcdev, struct lantiq_rcu_reset_priv, rcdev); +} + +static int lantiq_rcu_reset_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct lantiq_rcu_reset_priv *priv = to_lantiq_rcu_reset_priv(rcdev); + unsigned int status = (id >> 8) & 0x1f; + u32 val; + int ret; + + ret = regmap_read(priv->regmap, priv->status_offset, &val); + if (ret) + return ret; + + return !!(val & BIT(status)); +} + +static int lantiq_rcu_reset_status_timeout(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + int ret; + int retry = LANTIQ_RCU_RESET_TIMEOUT; + + do { + ret = lantiq_rcu_reset_status(rcdev, id); + if (ret < 0) + return ret; + if (ret == assert) + return 0; + usleep_range(20, 40); + } while (--retry); + + return -ETIMEDOUT; +} + +static int lantiq_rcu_reset_update(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + struct lantiq_rcu_reset_priv *priv = to_lantiq_rcu_reset_priv(rcdev); + unsigned int set = id & 0x1f; + u32 val = assert ? BIT(set) : 0; + int ret; + + ret = regmap_update_bits(priv->regmap, priv->reset_offset, BIT(set), + val); + if (ret) { + dev_err(priv->dev, "Failed to set reset bit %u\n", set); + return ret; + } + + + ret = lantiq_rcu_reset_status_timeout(rcdev, id, assert); + if (ret) + dev_err(priv->dev, "Failed to %s bit %u\n", + assert ? "assert" : "deassert", set); + + return ret; +} + +static int lantiq_rcu_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return lantiq_rcu_reset_update(rcdev, id, true); +} + +static int lantiq_rcu_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return lantiq_rcu_reset_update(rcdev, id, false); +} + +static int lantiq_rcu_reset_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + int ret; + + ret = lantiq_rcu_reset_assert(rcdev, id); + if (ret) + return ret; + + return lantiq_rcu_reset_deassert(rcdev, id); +} + +static const struct reset_control_ops lantiq_rcu_reset_ops = { + .assert = lantiq_rcu_reset_assert, + .deassert = lantiq_rcu_reset_deassert, + .status = lantiq_rcu_reset_status, + .reset = lantiq_rcu_reset_reset, +}; + +static int lantiq_rcu_reset_of_parse(struct platform_device *pdev, + struct lantiq_rcu_reset_priv *priv) +{ + struct device *dev = &pdev->dev; + const __be32 *offset; + + priv->regmap = syscon_node_to_regmap(dev->of_node->parent); + if (IS_ERR(priv->regmap)) { + dev_err(&pdev->dev, "Failed to lookup RCU regmap\n"); + return PTR_ERR(priv->regmap); + } + + offset = of_get_address(dev->of_node, 0, NULL, NULL); + if (!offset) { + dev_err(&pdev->dev, "Failed to get RCU reset offset\n"); + return -ENOENT; + } + priv->reset_offset = __be32_to_cpu(*offset); + + offset = of_get_address(dev->of_node, 1, NULL, NULL); + if (!offset) { + dev_err(&pdev->dev, "Failed to get RCU status offset\n"); + return -ENOENT; + } + priv->status_offset = __be32_to_cpu(*offset); + + return 0; +} + +static int lantiq_rcu_reset_xlate(struct reset_controller_dev *rcdev, + const struct of_phandle_args *reset_spec) +{ + unsigned int status, set; + + set = reset_spec->args[0]; + status = reset_spec->args[1]; + + if (set >= rcdev->nr_resets || status >= rcdev->nr_resets) + return -EINVAL; + + return (status << 8) | set; +} + +static int lantiq_rcu_reset_probe(struct platform_device *pdev) +{ + struct lantiq_rcu_reset_priv *priv; + int err; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &pdev->dev; + platform_set_drvdata(pdev, priv); + + err = lantiq_rcu_reset_of_parse(pdev, priv); + if (err) + return err; + + priv->rcdev.ops = &lantiq_rcu_reset_ops; + priv->rcdev.owner = THIS_MODULE; + priv->rcdev.of_node = pdev->dev.of_node; + priv->rcdev.nr_resets = 32; + priv->rcdev.of_xlate = lantiq_rcu_reset_xlate; + priv->rcdev.of_reset_n_cells = 2; + + return reset_controller_register(&priv->rcdev); +} + +static const struct of_device_id lantiq_rcu_reset_dt_ids[] = { + { .compatible = "lantiq,danube-reset", }, + { .compatible = "lantiq,xrx200-reset", }, + { }, +}; +MODULE_DEVICE_TABLE(of, lantiq_rcu_reset_dt_ids); + +static struct platform_driver lantiq_rcu_reset_driver = { + .probe = lantiq_rcu_reset_probe, + .driver = { + .name = "lantiq-reset", + .of_match_table = lantiq_rcu_reset_dt_ids, + }, +}; +module_platform_driver(lantiq_rcu_reset_driver); + +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); +MODULE_DESCRIPTION("Lantiq XWAY RCU Reset Controller Driver"); +MODULE_LICENSE("GPL");