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-rw-r--r--target/linux/ramips/patches-3.8/0067-reset-Add-reset-controller-API.patch554
1 files changed, 0 insertions, 554 deletions
diff --git a/target/linux/ramips/patches-3.8/0067-reset-Add-reset-controller-API.patch b/target/linux/ramips/patches-3.8/0067-reset-Add-reset-controller-API.patch
deleted file mode 100644
index 55bbb56d00..0000000000
--- a/target/linux/ramips/patches-3.8/0067-reset-Add-reset-controller-API.patch
+++ /dev/null
@@ -1,554 +0,0 @@
-From 8951e08252c6c254d68c350468c40f88a12bcc1d Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Mon, 20 May 2013 15:42:01 +0200
-Subject: [PATCH 67/79] reset: Add reset controller API
-
-backport from v3.10-rc1
-61fc41317666be400802ac793f47de816ef7bd57
-6034bb22d8387708075c083385e5d2e1072a4f33
-4e11f848c65b1c87782cb232a6e3b47a9d4c1f98
-
-This adds a simple API for devices to request being reset
-by separate reset controller hardware and implements the
-reset signal device tree binding.
-
-Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
-Reviewed-by: Stephen Warren <swarren@nvidia.com>
-Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
-Reviewed-by: Marek Vasut <marex@denx.de>
-Reviewed-by: Pavel Machek <pavel@ucw.cz>
----
- Documentation/devicetree/bindings/reset/reset.txt | 75 ++++++
- drivers/Kconfig | 2 +
- drivers/Makefile | 3 +
- drivers/reset/Kconfig | 13 +
- drivers/reset/Makefile | 1 +
- drivers/reset/core.c | 297 +++++++++++++++++++++
- include/linux/reset-controller.h | 51 ++++
- include/linux/reset.h | 17 ++
- 8 files changed, 459 insertions(+)
- create mode 100644 Documentation/devicetree/bindings/reset/reset.txt
- create mode 100644 drivers/reset/Kconfig
- create mode 100644 drivers/reset/Makefile
- create mode 100644 drivers/reset/core.c
- create mode 100644 include/linux/reset-controller.h
- create mode 100644 include/linux/reset.h
-
-diff --git a/Documentation/devicetree/bindings/reset/reset.txt b/Documentation/devicetree/bindings/reset/reset.txt
-new file mode 100644
-index 0000000..31db6ff
---- /dev/null
-+++ b/Documentation/devicetree/bindings/reset/reset.txt
-@@ -0,0 +1,75 @@
-+= Reset Signal Device Tree Bindings =
-+
-+This binding is intended to represent the hardware reset signals present
-+internally in most IC (SoC, FPGA, ...) designs. Reset signals for whole
-+standalone chips are most likely better represented as GPIOs, although there
-+are likely to be exceptions to this rule.
-+
-+Hardware blocks typically receive a reset signal. This signal is generated by
-+a reset provider (e.g. power management or clock module) and received by a
-+reset consumer (the module being reset, or a module managing when a sub-
-+ordinate module is reset). This binding exists to represent the provider and
-+consumer, and provide a way to couple the two together.
-+
-+A reset signal is represented by the phandle of the provider, plus a reset
-+specifier - a list of DT cells that represents the reset signal within the
-+provider. The length (number of cells) and semantics of the reset specifier
-+are dictated by the binding of the reset provider, although common schemes
-+are described below.
-+
-+A word on where to place reset signal consumers in device tree: It is possible
-+in hardware for a reset signal to affect multiple logically separate HW blocks
-+at once. In this case, it would be unwise to represent this reset signal in
-+the DT node of each affected HW block, since if activated, an unrelated block
-+may be reset. Instead, reset signals should be represented in the DT node
-+where it makes most sense to control it; this may be a bus node if all
-+children of the bus are affected by the reset signal, or an individual HW
-+block node for dedicated reset signals. The intent of this binding is to give
-+appropriate software access to the reset signals in order to manage the HW,
-+rather than to slavishly enumerate the reset signal that affects each HW
-+block.
-+
-+= Reset providers =
-+
-+Required properties:
-+#reset-cells: Number of cells in a reset specifier; Typically 0 for nodes
-+ with a single reset output and 1 for nodes with multiple
-+ reset outputs.
-+
-+For example:
-+
-+ rst: reset-controller {
-+ #reset-cells = <1>;
-+ };
-+
-+= Reset consumers =
-+
-+Required properties:
-+resets: List of phandle and reset specifier pairs, one pair
-+ for each reset signal that affects the device, or that the
-+ device manages. Note: if the reset provider specifies '0' for
-+ #reset-cells, then only the phandle portion of the pair will
-+ appear.
-+
-+Optional properties:
-+reset-names: List of reset signal name strings sorted in the same order as
-+ the resets property. Consumers drivers will use reset-names to
-+ match reset signal names with reset specifiers.
-+
-+For example:
-+
-+ device {
-+ resets = <&rst 20>;
-+ reset-names = "reset";
-+ };
-+
-+This represents a device with a single reset signal named "reset".
-+
-+ bus {
-+ resets = <&rst 10> <&rst 11> <&rst 12> <&rst 11>;
-+ reset-names = "i2s1", "i2s2", "dma", "mixer";
-+ };
-+
-+This represents a bus that controls the reset signal of each of four sub-
-+ordinate devices. Consider for example a bus that fails to operate unless no
-+child device has reset asserted.
-diff --git a/drivers/Kconfig b/drivers/Kconfig
-index f5fb072..51f73ae 100644
---- a/drivers/Kconfig
-+++ b/drivers/Kconfig
-@@ -158,4 +158,6 @@ source "drivers/irqchip/Kconfig"
-
- source "drivers/ipack/Kconfig"
-
-+source "drivers/reset/Kconfig"
-+
- endmenu
-diff --git a/drivers/Makefile b/drivers/Makefile
-index 7863b9f..2819ac0 100644
---- a/drivers/Makefile
-+++ b/drivers/Makefile
-@@ -37,6 +37,9 @@ obj-$(CONFIG_XEN) += xen/
- # regulators early, since some subsystems rely on them to initialize
- obj-$(CONFIG_REGULATOR) += regulator/
-
-+# reset controllers early, since gpu drivers might rely on them to initialize
-+obj-$(CONFIG_RESET_CONTROLLER) += reset/
-+
- # tty/ comes before char/ so that the VT console is the boot-time
- # default.
- obj-y += tty/
-diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
-new file mode 100644
-index 0000000..c9d04f7
---- /dev/null
-+++ b/drivers/reset/Kconfig
-@@ -0,0 +1,13 @@
-+config ARCH_HAS_RESET_CONTROLLER
-+ bool
-+
-+menuconfig RESET_CONTROLLER
-+ bool "Reset Controller Support"
-+ default y if ARCH_HAS_RESET_CONTROLLER
-+ help
-+ Generic Reset Controller support.
-+
-+ This framework is designed to abstract reset handling of devices
-+ via GPIOs or SoC-internal reset controller modules.
-+
-+ If unsure, say no.
-diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
-new file mode 100644
-index 0000000..1e2d83f
---- /dev/null
-+++ b/drivers/reset/Makefile
-@@ -0,0 +1 @@
-+obj-$(CONFIG_RESET_CONTROLLER) += core.o
-diff --git a/drivers/reset/core.c b/drivers/reset/core.c
-new file mode 100644
-index 0000000..d1b6089
---- /dev/null
-+++ b/drivers/reset/core.c
-@@ -0,0 +1,297 @@
-+/*
-+ * Reset Controller framework
-+ *
-+ * Copyright 2013 Philipp Zabel, Pengutronix
-+ *
-+ * 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/device.h>
-+#include <linux/err.h>
-+#include <linux/export.h>
-+#include <linux/kernel.h>
-+#include <linux/module.h>
-+#include <linux/of.h>
-+#include <linux/reset.h>
-+#include <linux/reset-controller.h>
-+#include <linux/slab.h>
-+
-+static DEFINE_MUTEX(reset_controller_list_mutex);
-+static LIST_HEAD(reset_controller_list);
-+
-+/**
-+ * struct reset_control - a reset control
-+ * @rcdev: a pointer to the reset controller device
-+ * this reset control belongs to
-+ * @id: ID of the reset controller in the reset
-+ * controller device
-+ */
-+struct reset_control {
-+ struct reset_controller_dev *rcdev;
-+ struct device *dev;
-+ unsigned int id;
-+};
-+
-+/**
-+ * of_reset_simple_xlate - translate reset_spec to the reset line number
-+ * @rcdev: a pointer to the reset controller device
-+ * @reset_spec: reset line specifier as found in the device tree
-+ * @flags: a flags pointer to fill in (optional)
-+ *
-+ * This simple translation function should be used for reset controllers
-+ * with 1:1 mapping, where reset lines can be indexed by number without gaps.
-+ */
-+int of_reset_simple_xlate(struct reset_controller_dev *rcdev,
-+ const struct of_phandle_args *reset_spec)
-+{
-+ if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
-+ return -EINVAL;
-+
-+ if (reset_spec->args[0] >= rcdev->nr_resets)
-+ return -EINVAL;
-+
-+ return reset_spec->args[0];
-+}
-+EXPORT_SYMBOL_GPL(of_reset_simple_xlate);
-+
-+/**
-+ * reset_controller_register - register a reset controller device
-+ * @rcdev: a pointer to the initialized reset controller device
-+ */
-+int reset_controller_register(struct reset_controller_dev *rcdev)
-+{
-+ if (!rcdev->of_xlate) {
-+ rcdev->of_reset_n_cells = 1;
-+ rcdev->of_xlate = of_reset_simple_xlate;
-+ }
-+
-+ mutex_lock(&reset_controller_list_mutex);
-+ list_add(&rcdev->list, &reset_controller_list);
-+ mutex_unlock(&reset_controller_list_mutex);
-+
-+ return 0;
-+}
-+EXPORT_SYMBOL_GPL(reset_controller_register);
-+
-+/**
-+ * reset_controller_unregister - unregister a reset controller device
-+ * @rcdev: a pointer to the reset controller device
-+ */
-+void reset_controller_unregister(struct reset_controller_dev *rcdev)
-+{
-+ mutex_lock(&reset_controller_list_mutex);
-+ list_del(&rcdev->list);
-+ mutex_unlock(&reset_controller_list_mutex);
-+}
-+EXPORT_SYMBOL_GPL(reset_controller_unregister);
-+
-+/**
-+ * reset_control_reset - reset the controlled device
-+ * @rstc: reset controller
-+ */
-+int reset_control_reset(struct reset_control *rstc)
-+{
-+ if (rstc->rcdev->ops->reset)
-+ return rstc->rcdev->ops->reset(rstc->rcdev, rstc->id);
-+
-+ return -ENOSYS;
-+}
-+EXPORT_SYMBOL_GPL(reset_control_reset);
-+
-+/**
-+ * reset_control_assert - asserts the reset line
-+ * @rstc: reset controller
-+ */
-+int reset_control_assert(struct reset_control *rstc)
-+{
-+ if (rstc->rcdev->ops->assert)
-+ return rstc->rcdev->ops->assert(rstc->rcdev, rstc->id);
-+
-+ return -ENOSYS;
-+}
-+EXPORT_SYMBOL_GPL(reset_control_assert);
-+
-+/**
-+ * reset_control_deassert - deasserts the reset line
-+ * @rstc: reset controller
-+ */
-+int reset_control_deassert(struct reset_control *rstc)
-+{
-+ if (rstc->rcdev->ops->deassert)
-+ return rstc->rcdev->ops->deassert(rstc->rcdev, rstc->id);
-+
-+ return -ENOSYS;
-+}
-+EXPORT_SYMBOL_GPL(reset_control_deassert);
-+
-+/**
-+ * reset_control_get - Lookup and obtain a reference to a reset controller.
-+ * @dev: device to be reset by the controller
-+ * @id: reset line name
-+ *
-+ * Returns a struct reset_control or IS_ERR() condition containing errno.
-+ *
-+ * Use of id names is optional.
-+ */
-+struct reset_control *reset_control_get(struct device *dev, const char *id)
-+{
-+ struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER);
-+ struct reset_controller_dev *r, *rcdev;
-+ struct of_phandle_args args;
-+ int index = 0;
-+ int rstc_id;
-+ int ret;
-+
-+ if (!dev)
-+ return ERR_PTR(-EINVAL);
-+
-+ if (id)
-+ index = of_property_match_string(dev->of_node,
-+ "reset-names", id);
-+ ret = of_parse_phandle_with_args(dev->of_node, "resets", "#reset-cells",
-+ index, &args);
-+ if (ret)
-+ return ERR_PTR(ret);
-+
-+ mutex_lock(&reset_controller_list_mutex);
-+ rcdev = NULL;
-+ list_for_each_entry(r, &reset_controller_list, list) {
-+ if (args.np == r->of_node) {
-+ rcdev = r;
-+ break;
-+ }
-+ }
-+ of_node_put(args.np);
-+
-+ if (!rcdev) {
-+ mutex_unlock(&reset_controller_list_mutex);
-+ return ERR_PTR(-ENODEV);
-+ }
-+
-+ rstc_id = rcdev->of_xlate(rcdev, &args);
-+ if (rstc_id < 0) {
-+ mutex_unlock(&reset_controller_list_mutex);
-+ return ERR_PTR(rstc_id);
-+ }
-+
-+ try_module_get(rcdev->owner);
-+ mutex_unlock(&reset_controller_list_mutex);
-+
-+ rstc = kzalloc(sizeof(*rstc), GFP_KERNEL);
-+ if (!rstc) {
-+ module_put(rcdev->owner);
-+ return ERR_PTR(-ENOMEM);
-+ }
-+
-+ rstc->dev = dev;
-+ rstc->rcdev = rcdev;
-+ rstc->id = rstc_id;
-+
-+ return rstc;
-+}
-+EXPORT_SYMBOL_GPL(reset_control_get);
-+
-+/**
-+ * reset_control_put - free the reset controller
-+ * @rstc: reset controller
-+ */
-+
-+void reset_control_put(struct reset_control *rstc)
-+{
-+ if (IS_ERR(rstc))
-+ return;
-+
-+ module_put(rstc->rcdev->owner);
-+ kfree(rstc);
-+}
-+EXPORT_SYMBOL_GPL(reset_control_put);
-+
-+static void devm_reset_control_release(struct device *dev, void *res)
-+{
-+ reset_control_put(*(struct reset_control **)res);
-+}
-+
-+/**
-+ * devm_reset_control_get - resource managed reset_control_get()
-+ * @dev: device to be reset by the controller
-+ * @id: reset line name
-+ *
-+ * Managed reset_control_get(). For reset controllers returned from this
-+ * function, reset_control_put() is called automatically on driver detach.
-+ * See reset_control_get() for more information.
-+ */
-+struct reset_control *devm_reset_control_get(struct device *dev, const char *id)
-+{
-+ struct reset_control **ptr, *rstc;
-+
-+ ptr = devres_alloc(devm_reset_control_release, sizeof(*ptr),
-+ GFP_KERNEL);
-+ if (!ptr)
-+ return ERR_PTR(-ENOMEM);
-+
-+ rstc = reset_control_get(dev, id);
-+ if (!IS_ERR(rstc)) {
-+ *ptr = rstc;
-+ devres_add(dev, ptr);
-+ } else {
-+ devres_free(ptr);
-+ }
-+
-+ return rstc;
-+}
-+EXPORT_SYMBOL_GPL(devm_reset_control_get);
-+
-+static int devm_reset_control_match(struct device *dev, void *res, void *data)
-+{
-+ struct reset_control **rstc = res;
-+ if (WARN_ON(!rstc || !*rstc))
-+ return 0;
-+ return *rstc == data;
-+}
-+
-+/**
-+ * devm_reset_control_put - resource managed reset_control_put()
-+ * @rstc: reset controller to free
-+ *
-+ * Deallocate a reset control allocated withd devm_reset_control_get().
-+ * This function will not need to be called normally, as devres will take
-+ * care of freeing the resource.
-+ */
-+void devm_reset_control_put(struct reset_control *rstc)
-+{
-+ int ret;
-+
-+ ret = devres_release(rstc->dev, devm_reset_control_release,
-+ devm_reset_control_match, rstc);
-+ if (ret)
-+ WARN_ON(ret);
-+}
-+EXPORT_SYMBOL_GPL(devm_reset_control_put);
-+
-+/**
-+ * device_reset - find reset controller associated with the device
-+ * and perform reset
-+ * @dev: device to be reset by the controller
-+ *
-+ * Convenience wrapper for reset_control_get() and reset_control_reset().
-+ * This is useful for the common case of devices with single, dedicated reset
-+ * lines.
-+ */
-+int device_reset(struct device *dev)
-+{
-+ struct reset_control *rstc;
-+ int ret;
-+
-+ rstc = reset_control_get(dev, NULL);
-+ if (IS_ERR(rstc))
-+ return PTR_ERR(rstc);
-+
-+ ret = reset_control_reset(rstc);
-+
-+ reset_control_put(rstc);
-+
-+ return ret;
-+}
-+EXPORT_SYMBOL_GPL(device_reset);
-diff --git a/include/linux/reset-controller.h b/include/linux/reset-controller.h
-new file mode 100644
-index 0000000..2f61311
---- /dev/null
-+++ b/include/linux/reset-controller.h
-@@ -0,0 +1,51 @@
-+#ifndef _LINUX_RESET_CONTROLLER_H_
-+#define _LINUX_RESET_CONTROLLER_H_
-+
-+#include <linux/list.h>
-+
-+struct reset_controller_dev;
-+
-+/**
-+ * struct reset_control_ops
-+ *
-+ * @reset: for self-deasserting resets, does all necessary
-+ * things to reset the device
-+ * @assert: manually assert the reset line, if supported
-+ * @deassert: manually deassert the reset line, if supported
-+ */
-+struct reset_control_ops {
-+ int (*reset)(struct reset_controller_dev *rcdev, unsigned long id);
-+ int (*assert)(struct reset_controller_dev *rcdev, unsigned long id);
-+ int (*deassert)(struct reset_controller_dev *rcdev, unsigned long id);
-+};
-+
-+struct module;
-+struct device_node;
-+
-+/**
-+ * struct reset_controller_dev - reset controller entity that might
-+ * provide multiple reset controls
-+ * @ops: a pointer to device specific struct reset_control_ops
-+ * @owner: kernel module of the reset controller driver
-+ * @list: internal list of reset controller devices
-+ * @of_node: corresponding device tree node as phandle target
-+ * @of_reset_n_cells: number of cells in reset line specifiers
-+ * @of_xlate: translation function to translate from specifier as found in the
-+ * device tree to id as given to the reset control ops
-+ * @nr_resets: number of reset controls in this reset controller device
-+ */
-+struct reset_controller_dev {
-+ struct reset_control_ops *ops;
-+ struct module *owner;
-+ struct list_head list;
-+ struct device_node *of_node;
-+ int of_reset_n_cells;
-+ int (*of_xlate)(struct reset_controller_dev *rcdev,
-+ const struct of_phandle_args *reset_spec);
-+ unsigned int nr_resets;
-+};
-+
-+int reset_controller_register(struct reset_controller_dev *rcdev);
-+void reset_controller_unregister(struct reset_controller_dev *rcdev);
-+
-+#endif
-diff --git a/include/linux/reset.h b/include/linux/reset.h
-new file mode 100644
-index 0000000..6082247
---- /dev/null
-+++ b/include/linux/reset.h
-@@ -0,0 +1,17 @@
-+#ifndef _LINUX_RESET_H_
-+#define _LINUX_RESET_H_
-+
-+struct device;
-+struct reset_control;
-+
-+int reset_control_reset(struct reset_control *rstc);
-+int reset_control_assert(struct reset_control *rstc);
-+int reset_control_deassert(struct reset_control *rstc);
-+
-+struct reset_control *reset_control_get(struct device *dev, const char *id);
-+void reset_control_put(struct reset_control *rstc);
-+struct reset_control *devm_reset_control_get(struct device *dev, const char *id);
-+
-+int device_reset(struct device *dev);
-+
-+#endif
---
-1.7.10.4
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 11:37:39 +0000