1 files changed, 381 insertions, 0 deletions
diff --git a/include/clk.h b/include/clk.h
new file mode 100644
index 0000000..18b2e3c
--- /dev/null
+++ b/include/clk.h
@@ -0,0 +1,381 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ */
+
+#ifndef _CLK_H_
+#define _CLK_H_
+
+#include <dm/ofnode.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+
+/**
+ * A clock is a hardware signal that oscillates autonomously at a specific
+ * frequency and duty cycle. Most hardware modules require one or more clock
+ * signal to drive their operation. Clock signals are typically generated
+ * externally to the HW module consuming them, by an entity this API calls a
+ * clock provider. This API provides a standard means for drivers to enable and
+ * disable clocks, and to set the rate at which they oscillate.
+ *
+ * A driver that implements UCLASS_CLK is a clock provider. A provider will
+ * often implement multiple separate clocks, since the hardware it manages
+ * often has this capability. clk-uclass.h describes the interface which
+ * clock providers must implement.
+ *
+ * Clock consumers/clients are the HW modules driven by the clock signals. This
+ * header file describes the API used by drivers for those HW modules.
+ */
+
+struct udevice;
+
+/**
+ * struct clk - A handle to (allowing control of) a single clock.
+ *
+ * Clients provide storage for clock handles. The content of the structure is
+ * managed solely by the clock API and clock drivers. A clock struct is
+ * initialized by "get"ing the clock struct. The clock struct is passed to all
+ * other clock APIs to identify which clock signal to operate upon.
+ *
+ * @dev: The device which implements the clock signal.
+ * @rate: The clock rate (in HZ).
+ * @flags: Flags used across common clock structure (e.g. CLK_)
+ *         Clock IP blocks specific flags (i.e. mux, div, gate, etc) are defined
+ *         in struct's for those devices (e.g. struct clk_mux).
+ * @id: The clock signal ID within the provider.
+ * @data: An optional data field for scenarios where a single integer ID is not
+ *	  sufficient. If used, it can be populated through an .of_xlate op and
+ *	  processed during the various clock ops.
+ *
+ * Should additional information to identify and configure any clock signal
+ * for any provider be required in the future, the struct could be expanded to
+ * either (a) add more fields to allow clock providers to store additional
+ * information, or (b) replace the id field with an opaque pointer, which the
+ * provider would dynamically allocated during its .of_xlate op, and process
+ * during is .request op. This may require the addition of an extra op to clean
+ * up the allocation.
+ */
+struct clk {
+	struct udevice *dev;
+	long long rate;	/* in HZ */
+	u32 flags;
+	int enable_count;
+	/*
+	 * Written by of_xlate. In the future, we might add more fields here.
+	 */
+	unsigned long id;
+	unsigned long data;
+};
+
+/**
+ * struct clk_bulk - A handle to (allowing control of) a bulk of clocks.
+ *
+ * Clients provide storage for the clock bulk. The content of the structure is
+ * managed solely by the clock API. A clock bulk struct is
+ * initialized by "get"ing the clock bulk struct.
+ * The clock bulk struct is passed to all other bulk clock APIs to apply
+ * the API to all the clock in the bulk struct.
+ *
+ * @clks: An array of clock handles.
+ * @count: The number of clock handles in the clks array.
+ */
+struct clk_bulk {
+	struct clk *clks;
+	unsigned int count;
+};
+
+#if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(CLK)
+struct phandle_1_arg;
+int clk_get_by_index_platdata(struct udevice *dev, int index,
+			      struct phandle_1_arg *cells, struct clk *clk);
+
+/**
+ * clock_get_by_index - Get/request a clock by integer index.
+ *
+ * This looks up and requests a clock. The index is relative to the client
+ * device; each device is assumed to have n clocks associated with it somehow,
+ * and this function finds and requests one of them. The mapping of client
+ * device clock indices to provider clocks may be via device-tree properties,
+ * board-provided mapping tables, or some other mechanism.
+ *
+ * @dev:	The client device.
+ * @index:	The index of the clock to request, within the client's list of
+ *		clocks.
+ * @clock	A pointer to a clock struct to initialize.
+ * @return 0 if OK, or a negative error code.
+ */
+int clk_get_by_index(struct udevice *dev, int index, struct clk *clk);
+
+/**
+ * clock_get_by_index_nodev - Get/request a clock by integer index
+ * without a device.
+ *
+ * This is a version of clk_get_by_index() that does not use a device.
+ *
+ * @node:	The client ofnode.
+ * @index:	The index of the clock to request, within the client's list of
+ *		clocks.
+ * @clock	A pointer to a clock struct to initialize.
+ * @return 0 if OK, or a negative error code.
+ */
+int clk_get_by_index_nodev(ofnode node, int index, struct clk *clk);
+
+/**
+ * clock_get_bulk - Get/request all clocks of a device.
+ *
+ * This looks up and requests all clocks of the client device; each device is
+ * assumed to have n clocks associated with it somehow, and this function finds
+ * and requests all of them in a separate structure. The mapping of client
+ * device clock indices to provider clocks may be via device-tree properties,
+ * board-provided mapping tables, or some other mechanism.
+ *
+ * @dev:	The client device.
+ * @bulk	A pointer to a clock bulk struct to initialize.
+ * @return 0 if OK, or a negative error code.
+ */
+int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk);
+
+/**
+ * clock_get_by_name - Get/request a clock by name.
+ *
+ * This looks up and requests a clock. The name is relative to the client
+ * device; each device is assumed to have n clocks associated with it somehow,
+ * and this function finds and requests one of them. The mapping of client
+ * device clock names to provider clocks may be via device-tree properties,
+ * board-provided mapping tables, or some other mechanism.
+ *
+ * @dev:	The client device.
+ * @name:	The name of the clock to request, within the client's list of
+ *		clocks.
+ * @clock:	A pointer to a clock struct to initialize.
+ * @return 0 if OK, or a negative error code.
+ */
+int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk);
+
+/**
+ * clk_release_all() - Disable (turn off)/Free an array of previously
+ * requested clocks.
+ *
+ * For each clock contained in the clock array, this function will check if
+ * clock has been previously requested and then will disable and free it.
+ *
+ * @clk:	A clock struct array that was previously successfully
+ *		requested by clk_request/get_by_*().
+ * @count	Number of clock contained in the array
+ * @return zero on success, or -ve error code.
+ */
+int clk_release_all(struct clk *clk, int count);
+
+#else
+static inline int clk_get_by_index(struct udevice *dev, int index,
+				   struct clk *clk)
+{
+	return -ENOSYS;
+}
+
+static inline int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
+{
+	return -ENOSYS;
+}
+
+static inline int clk_get_by_name(struct udevice *dev, const char *name,
+			   struct clk *clk)
+{
+	return -ENOSYS;
+}
+
+static inline int clk_release_all(struct clk *clk, int count)
+{
+	return -ENOSYS;
+}
+#endif
+
+#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \
+	CONFIG_IS_ENABLED(CLK)
+/**
+ * clk_set_defaults - Process 'assigned-{clocks/clock-parents/clock-rates}'
+ *                    properties to configure clocks
+ *
+ * @dev:        A device to process (the ofnode associated with this device
+ *              will be processed).
+ */
+int clk_set_defaults(struct udevice *dev);
+#else
+static inline int clk_set_defaults(struct udevice *dev)
+{
+	return 0;
+}
+#endif
+
+/**
+ * clk_release_bulk() - Disable (turn off)/Free an array of previously
+ * requested clocks in a clock bulk struct.
+ *
+ * For each clock contained in the clock bulk struct, this function will check
+ * if clock has been previously requested and then will disable and free it.
+ *
+ * @clk:	A clock bulk struct that was previously successfully
+ *		requested by clk_get_bulk().
+ * @return zero on success, or -ve error code.
+ */
+static inline int clk_release_bulk(struct clk_bulk *bulk)
+{
+	return clk_release_all(bulk->clks, bulk->count);
+}
+
+/**
+ * clk_request - Request a clock by provider-specific ID.
+ *
+ * This requests a clock using a provider-specific ID. Generally, this function
+ * should not be used, since clk_get_by_index/name() provide an interface that
+ * better separates clients from intimate knowledge of clock providers.
+ * However, this function may be useful in core SoC-specific code.
+ *
+ * @dev:	The clock provider device.
+ * @clock:	A pointer to a clock struct to initialize. The caller must
+ *		have already initialized any field in this struct which the
+ *		clock provider uses to identify the clock.
+ * @return 0 if OK, or a negative error code.
+ */
+int clk_request(struct udevice *dev, struct clk *clk);
+
+/**
+ * clock_free - Free a previously requested clock.
+ *
+ * @clock:	A clock struct that was previously successfully requested by
+ *		clk_request/get_by_*().
+ * @return 0 if OK, or a negative error code.
+ */
+int clk_free(struct clk *clk);
+
+/**
+ * clk_get_rate() - Get current clock rate.
+ *
+ * @clk:	A clock struct that was previously successfully requested by
+ *		clk_request/get_by_*().
+ * @return clock rate in Hz, or -ve error code.
+ */
+ulong clk_get_rate(struct clk *clk);
+
+/**
+ * clk_get_parent() - Get current clock's parent.
+ *
+ * @clk:	A clock struct that was previously successfully requested by
+ *		clk_request/get_by_*().
+ * @return pointer to parent's struct clk, or error code passed as pointer
+ */
+struct clk *clk_get_parent(struct clk *clk);
+
+/**
+ * clk_get_parent_rate() - Get parent of current clock rate.
+ *
+ * @clk:	A clock struct that was previously successfully requested by
+ *		clk_request/get_by_*().
+ * @return clock rate in Hz, or -ve error code.
+ */
+long long clk_get_parent_rate(struct clk *clk);
+
+/**
+ * clk_set_rate() - Set current clock rate.
+ *
+ * @clk:	A clock struct that was previously successfully requested by
+ *		clk_request/get_by_*().
+ * @rate:	New clock rate in Hz.
+ * @return new rate, or -ve error code.
+ */
+ulong clk_set_rate(struct clk *clk, ulong rate);
+
+/**
+ * clk_set_parent() - Set current clock parent.
+ *
+ * @clk:	A clock struct that was previously successfully requested by
+ *		clk_request/get_by_*().
+ * @parent:	A clock struct that was previously successfully requested by
+ *		clk_request/get_by_*().
+ * @return new rate, or -ve error code.
+ */
+int clk_set_parent(struct clk *clk, struct clk *parent);
+
+/**
+ * clk_enable() - Enable (turn on) a clock.
+ *
+ * @clk:	A clock struct that was previously successfully requested by
+ *		clk_request/get_by_*().
+ * @return zero on success, or -ve error code.
+ */
+int clk_enable(struct clk *clk);
+
+/**
+ * clk_enable_bulk() - Enable (turn on) all clocks in a clock bulk struct.
+ *
+ * @bulk:	A clock bulk struct that was previously successfully requested
+ *		by clk_get_bulk().
+ * @return zero on success, or -ve error code.
+ */
+int clk_enable_bulk(struct clk_bulk *bulk);
+
+/**
+ * clk_disable() - Disable (turn off) a clock.
+ *
+ * @clk:	A clock struct that was previously successfully requested by
+ *		clk_request/get_by_*().
+ * @return zero on success, or -ve error code.
+ */
+int clk_disable(struct clk *clk);
+
+/**
+ * clk_disable_bulk() - Disable (turn off) all clocks in a clock bulk struct.
+ *
+ * @bulk:	A clock bulk struct that was previously successfully requested
+ *		by clk_get_bulk().
+ * @return zero on success, or -ve error code.
+ */
+int clk_disable_bulk(struct clk_bulk *bulk);
+
+/**
+ * clk_is_match - check if two clk's point to the same hardware clock
+ * @p: clk compared against q
+ * @q: clk compared against p
+ *
+ * Returns true if the two struct clk pointers both point to the same hardware
+ * clock node.
+ *
+ * Returns false otherwise. Note that two NULL clks are treated as matching.
+ */
+bool clk_is_match(const struct clk *p, const struct clk *q);
+
+int soc_clk_dump(void);
+
+/**
+ * clk_valid() - check if clk is valid
+ *
+ * @clk:	the clock to check
+ * @return true if valid, or false
+ */
+static inline bool clk_valid(struct clk *clk)
+{
+	return !!clk->dev;
+}
+
+/**
+ * clk_get_by_id() - Get the clock by its ID
+ *
+ * @id:	The clock ID to search for
+ *
+ * @clkp:	A pointer to clock struct that has been found among added clocks
+ *              to UCLASS_CLK
+ * @return zero on success, or -ENOENT on error
+ */
+int clk_get_by_id(ulong id, struct clk **clkp);
+
+/**
+ * clk_dev_binded() - Check whether the clk has a device binded
+ *
+ * @clk		A pointer to the clk
+ *
+ * @return true on binded, or false on no
+ */
+bool clk_dev_binded(struct clk *clk);
+#endif