diff options
Diffstat (limited to 'target/linux/ipq806x/patches-3.18/030-hwspinlock-core-add-device-tree-support.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-3.18/030-hwspinlock-core-add-device-tree-support.patch | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/target/linux/ipq806x/patches-3.18/030-hwspinlock-core-add-device-tree-support.patch b/target/linux/ipq806x/patches-3.18/030-hwspinlock-core-add-device-tree-support.patch deleted file mode 100644 index 04f35b7ec7..0000000000 --- a/target/linux/ipq806x/patches-3.18/030-hwspinlock-core-add-device-tree-support.patch +++ /dev/null @@ -1,167 +0,0 @@ -From fb7737e949e31d8a71acee6bbb670f32dbd2a2c0 Mon Sep 17 00:00:00 2001 -From: Suman Anna <s-anna@ti.com> -Date: Wed, 4 Mar 2015 20:01:14 -0600 -Subject: [PATCH] hwspinlock/core: add device tree support - -This patch adds a new OF-friendly API of_hwspin_lock_get_id() -for hwspinlock clients to use/request locks from a hwspinlock -device instantiated through a device-tree blob. This new API -can be used by hwspinlock clients to get the id for a specific -lock using the phandle + args specifier, so that it can be -requested using the available hwspin_lock_request_specific() -API. - -Signed-off-by: Suman Anna <s-anna@ti.com> -Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> -[small comment clarification] -Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com> ---- - Documentation/hwspinlock.txt | 10 +++++ - drivers/hwspinlock/hwspinlock_core.c | 79 ++++++++++++++++++++++++++++++++++++ - include/linux/hwspinlock.h | 7 ++++ - 3 files changed, 96 insertions(+) - ---- a/Documentation/hwspinlock.txt -+++ b/Documentation/hwspinlock.txt -@@ -48,6 +48,16 @@ independent, drivers. - ids for predefined purposes. - Should be called from a process context (might sleep). - -+ int of_hwspin_lock_get_id(struct device_node *np, int index); -+ - retrieve the global lock id for an OF phandle-based specific lock. -+ This function provides a means for DT users of a hwspinlock module -+ to get the global lock id of a specific hwspinlock, so that it can -+ be requested using the normal hwspin_lock_request_specific() API. -+ The function returns a lock id number on success, -EPROBE_DEFER if -+ the hwspinlock device is not yet registered with the core, or other -+ error values. -+ Should be called from a process context (might sleep). -+ - int hwspin_lock_free(struct hwspinlock *hwlock); - - free a previously-assigned hwspinlock; returns 0 on success, or an - appropriate error code on failure (e.g. -EINVAL if the hwspinlock ---- a/drivers/hwspinlock/hwspinlock_core.c -+++ b/drivers/hwspinlock/hwspinlock_core.c -@@ -27,6 +27,7 @@ - #include <linux/hwspinlock.h> - #include <linux/pm_runtime.h> - #include <linux/mutex.h> -+#include <linux/of.h> - - #include "hwspinlock_internal.h" - -@@ -257,6 +258,84 @@ void __hwspin_unlock(struct hwspinlock * - } - EXPORT_SYMBOL_GPL(__hwspin_unlock); - -+/** -+ * of_hwspin_lock_simple_xlate - translate hwlock_spec to return a lock id -+ * @bank: the hwspinlock device bank -+ * @hwlock_spec: hwlock specifier as found in the device tree -+ * -+ * This is a simple translation function, suitable for hwspinlock platform -+ * drivers that only has a lock specifier length of 1. -+ * -+ * Returns a relative index of the lock within a specified bank on success, -+ * or -EINVAL on invalid specifier cell count. -+ */ -+static inline int -+of_hwspin_lock_simple_xlate(const struct of_phandle_args *hwlock_spec) -+{ -+ if (WARN_ON(hwlock_spec->args_count != 1)) -+ return -EINVAL; -+ -+ return hwlock_spec->args[0]; -+} -+ -+/** -+ * of_hwspin_lock_get_id() - get lock id for an OF phandle-based specific lock -+ * @np: device node from which to request the specific hwlock -+ * @index: index of the hwlock in the list of values -+ * -+ * This function provides a means for DT users of the hwspinlock module to -+ * get the global lock id of a specific hwspinlock using the phandle of the -+ * hwspinlock device, so that it can be requested using the normal -+ * hwspin_lock_request_specific() API. -+ * -+ * Returns the global lock id number on success, -EPROBE_DEFER if the hwspinlock -+ * device is not yet registered, -EINVAL on invalid args specifier value or an -+ * appropriate error as returned from the OF parsing of the DT client node. -+ */ -+int of_hwspin_lock_get_id(struct device_node *np, int index) -+{ -+ struct of_phandle_args args; -+ struct hwspinlock *hwlock; -+ struct radix_tree_iter iter; -+ void **slot; -+ int id; -+ int ret; -+ -+ ret = of_parse_phandle_with_args(np, "hwlocks", "#hwlock-cells", index, -+ &args); -+ if (ret) -+ return ret; -+ -+ /* Find the hwspinlock device: we need its base_id */ -+ ret = -EPROBE_DEFER; -+ rcu_read_lock(); -+ radix_tree_for_each_slot(slot, &hwspinlock_tree, &iter, 0) { -+ hwlock = radix_tree_deref_slot(slot); -+ if (unlikely(!hwlock)) -+ continue; -+ -+ if (hwlock->bank->dev->of_node == args.np) { -+ ret = 0; -+ break; -+ } -+ } -+ rcu_read_unlock(); -+ if (ret < 0) -+ goto out; -+ -+ id = of_hwspin_lock_simple_xlate(&args); -+ if (id < 0 || id >= hwlock->bank->num_locks) { -+ ret = -EINVAL; -+ goto out; -+ } -+ id += hwlock->bank->base_id; -+ -+out: -+ of_node_put(args.np); -+ return ret ? ret : id; -+} -+EXPORT_SYMBOL_GPL(of_hwspin_lock_get_id); -+ - static int hwspin_lock_register_single(struct hwspinlock *hwlock, int id) - { - struct hwspinlock *tmp; ---- a/include/linux/hwspinlock.h -+++ b/include/linux/hwspinlock.h -@@ -26,6 +26,7 @@ - #define HWLOCK_IRQ 0x02 /* Disable interrupts, don't save state */ - - struct device; -+struct device_node; - struct hwspinlock; - struct hwspinlock_device; - struct hwspinlock_ops; -@@ -66,6 +67,7 @@ int hwspin_lock_unregister(struct hwspin - struct hwspinlock *hwspin_lock_request(void); - struct hwspinlock *hwspin_lock_request_specific(unsigned int id); - int hwspin_lock_free(struct hwspinlock *hwlock); -+int of_hwspin_lock_get_id(struct device_node *np, int index); - int hwspin_lock_get_id(struct hwspinlock *hwlock); - int __hwspin_lock_timeout(struct hwspinlock *, unsigned int, int, - unsigned long *); -@@ -120,6 +122,11 @@ void __hwspin_unlock(struct hwspinlock * - { - } - -+static inline int of_hwspin_lock_get_id(struct device_node *np, int index) -+{ -+ return 0; -+} -+ - static inline int hwspin_lock_get_id(struct hwspinlock *hwlock) - { - return 0; |