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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_HTE_H
#define __LINUX_HTE_H
#include <linux/errno.h>
struct hte_chip;
struct hte_device;
struct of_phandle_args;
/**
* enum hte_edge - HTE line edge flags.
*
* @HTE_EDGE_NO_SETUP: No edge setup. In this case consumer will setup edges,
* for example during request irq call.
* @HTE_RISING_EDGE_TS: Rising edge.
* @HTE_FALLING_EDGE_TS: Falling edge.
*
*/
enum hte_edge {
HTE_EDGE_NO_SETUP = 1U << 0,
HTE_RISING_EDGE_TS = 1U << 1,
HTE_FALLING_EDGE_TS = 1U << 2,
};
/**
* enum hte_return - HTE subsystem return values used during callback.
*
* @HTE_CB_HANDLED: The consumer handled the data.
* @HTE_RUN_SECOND_CB: The consumer needs further processing, in that case
* HTE subsystem calls secondary callback provided by the consumer where it
* is allowed to sleep.
*/
enum hte_return {
HTE_CB_HANDLED,
HTE_RUN_SECOND_CB,
};
/**
* struct hte_ts_data - HTE timestamp data.
*
* @tsc: Timestamp value.
* @seq: Sequence counter of the timestamps.
* @raw_level: Level of the line at the timestamp if provider supports it,
* -1 otherwise.
*/
struct hte_ts_data {
u64 tsc;
u64 seq;
int raw_level;
};
/**
* struct hte_clk_info - Clock source info that HTE provider uses to timestamp.
*
* @hz: Supported clock rate in HZ, for example 1KHz clock = 1000.
* @type: Supported clock type.
*/
struct hte_clk_info {
u64 hz;
clockid_t type;
};
/**
* typedef hte_ts_cb_t - HTE timestamp data processing primary callback.
*
* The callback is used to push timestamp data to the client and it is
* not allowed to sleep.
*
* @ts: HW timestamp data.
* @data: Client supplied data.
*/
typedef enum hte_return (*hte_ts_cb_t)(struct hte_ts_data *ts, void *data);
/**
* typedef hte_ts_sec_cb_t - HTE timestamp data processing secondary callback.
*
* This is used when the client needs further processing where it is
* allowed to sleep.
*
* @data: Client supplied data.
*
*/
typedef enum hte_return (*hte_ts_sec_cb_t)(void *data);
/**
* struct hte_line_attr - Line attributes.
*
* @line_id: The logical ID understood by the consumers and providers.
* @line_data: Line data related to line_id.
* @edge_flags: Edge setup flags.
* @name: Descriptive name of the entity that is being monitored for the
* hardware timestamping. If null, HTE core will construct the name.
*
*/
struct hte_line_attr {
u32 line_id;
void *line_data;
unsigned long edge_flags;
const char *name;
};
/**
* struct hte_ts_desc - HTE timestamp descriptor.
*
* This structure is a communication token between consumers to subsystem
* and subsystem to providers.
*
* @attr: The line attributes.
* @hte_data: Subsystem's private data, set by HTE subsystem.
*/
struct hte_ts_desc {
struct hte_line_attr attr;
void *hte_data;
};
/**
* struct hte_ops - HTE operations set by providers.
*
* @request: Hook for requesting a HTE timestamp. Returns 0 on success,
* non-zero for failures.
* @release: Hook for releasing a HTE timestamp. Returns 0 on success,
* non-zero for failures.
* @enable: Hook to enable the specified timestamp. Returns 0 on success,
* non-zero for failures.
* @disable: Hook to disable specified timestamp. Returns 0 on success,
* non-zero for failures.
* @get_clk_src_info: Hook to get the clock information the provider uses
* to timestamp. Returns 0 for success and negative error code for failure. On
* success HTE subsystem fills up provided struct hte_clk_info.
*
* xlated_id parameter is used to communicate between HTE subsystem and the
* providers and is translated by the provider.
*/
struct hte_ops {
int (*request)(struct hte_chip *chip, struct hte_ts_desc *desc,
u32 xlated_id);
int (*release)(struct hte_chip *chip, struct hte_ts_desc *desc,
u32 xlated_id);
int (*enable)(struct hte_chip *chip, u32 xlated_id);
int (*disable)(struct hte_chip *chip, u32 xlated_id);
int (*get_clk_src_info)(struct hte_chip *chip,
struct hte_clk_info *ci);
};
/**
* struct hte_chip - Abstract HTE chip.
*
* @name: functional name of the HTE IP block.
* @dev: device providing the HTE.
* @ops: callbacks for this HTE.
* @nlines: number of lines/signals supported by this chip.
* @xlate_of: Callback which translates consumer supplied logical ids to
* physical ids, return 0 for the success and negative for the failures.
* It stores (between 0 to @nlines) in xlated_id parameter for the success.
* @xlate_plat: Same as above but for the consumers with no DT node.
* @match_from_linedata: Match HTE device using the line_data.
* @of_hte_n_cells: Number of cells used to form the HTE specifier.
* @gdev: HTE subsystem abstract device, internal to the HTE subsystem.
* @data: chip specific private data.
*/
struct hte_chip {
const char *name;
struct device *dev;
const struct hte_ops *ops;
u32 nlines;
int (*xlate_of)(struct hte_chip *gc,
const struct of_phandle_args *args,
struct hte_ts_desc *desc, u32 *xlated_id);
int (*xlate_plat)(struct hte_chip *gc, struct hte_ts_desc *desc,
u32 *xlated_id);
bool (*match_from_linedata)(const struct hte_chip *chip,
const struct hte_ts_desc *hdesc);
u8 of_hte_n_cells;
struct hte_device *gdev;
void *data;
};
#if IS_ENABLED(CONFIG_HTE)
/* HTE APIs for the providers */
int devm_hte_register_chip(struct hte_chip *chip);
int hte_push_ts_ns(const struct hte_chip *chip, u32 xlated_id,
struct hte_ts_data *data);
/* HTE APIs for the consumers */
int hte_init_line_attr(struct hte_ts_desc *desc, u32 line_id,
unsigned long edge_flags, const char *name,
void *data);
int hte_ts_get(struct device *dev, struct hte_ts_desc *desc, int index);
int hte_ts_put(struct hte_ts_desc *desc);
int hte_request_ts_ns(struct hte_ts_desc *desc, hte_ts_cb_t cb,
hte_ts_sec_cb_t tcb, void *data);
int devm_hte_request_ts_ns(struct device *dev, struct hte_ts_desc *desc,
hte_ts_cb_t cb, hte_ts_sec_cb_t tcb, void *data);
int of_hte_req_count(struct device *dev);
int hte_enable_ts(struct hte_ts_desc *desc);
int hte_disable_ts(struct hte_ts_desc *desc);
int hte_get_clk_src_info(const struct hte_ts_desc *desc,
struct hte_clk_info *ci);
#else /* !CONFIG_HTE */
static inline int devm_hte_register_chip(struct hte_chip *chip)
{
return -EOPNOTSUPP;
}
static inline int hte_push_ts_ns(const struct hte_chip *chip,
u32 xlated_id,
const struct hte_ts_data *data)
{
return -EOPNOTSUPP;
}
static inline int hte_init_line_attr(struct hte_ts_desc *desc, u32 line_id,
unsigned long edge_flags,
const char *name, void *data)
{
return -EOPNOTSUPP;
}
static inline int hte_ts_get(struct device *dev, struct hte_ts_desc *desc,
int index)
{
return -EOPNOTSUPP;
}
static inline int hte_ts_put(struct hte_ts_desc *desc)
{
return -EOPNOTSUPP;
}
static inline int hte_request_ts_ns(struct hte_ts_desc *desc, hte_ts_cb_t cb,
hte_ts_sec_cb_t tcb, void *data)
{
return -EOPNOTSUPP;
}
static inline int devm_hte_request_ts_ns(struct device *dev,
struct hte_ts_desc *desc,
hte_ts_cb_t cb,
hte_ts_sec_cb_t tcb,
void *data)
{
return -EOPNOTSUPP;
}
static inline int of_hte_req_count(struct device *dev)
{
return -EOPNOTSUPP;
}
static inline int hte_enable_ts(struct hte_ts_desc *desc)
{
return -EOPNOTSUPP;
}
static inline int hte_disable_ts(struct hte_ts_desc *desc)
{
return -EOPNOTSUPP;
}
static inline int hte_get_clk_src_info(const struct hte_ts_desc *desc,
struct hte_clk_info *ci)
{
return -EOPNOTSUPP;
}
#endif /* !CONFIG_HTE */
#endif
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