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/* SPDX-License-Identifier: GPL-2.0 */
* Copyright (c) 2018 Linaro Limited, All rights reserved.
* Author: Mike Leach <>
#include <linux/coresight.h>
#include <linux/device.h>
#include <linux/fwnode.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include "coresight-priv.h"
* Device registers
* 0x000 - 0x144: CTI programming and status
* 0xEDC - 0xEF8: CTI integration test.
* 0xF00 - 0xFFC: Coresight management registers.
/* CTI programming registers */
#define CTICONTROL 0x000
#define CTIINTACK 0x010
#define CTIAPPSET 0x014
#define CTIAPPCLEAR 0x018
#define CTIAPPPULSE 0x01C
#define CTIINEN(n) (0x020 + (4 * n))
#define CTIOUTEN(n) (0x0A0 + (4 * n))
#define CTICHINSTATUS 0x138
#define CTIGATE 0x140
#define ASICCTL 0x144
/* Integration test registers */
#define ITCHINACK 0xEDC /* WO CTI CSSoc 400 only*/
#define ITTRIGINACK 0xEE0 /* WO CTI CSSoc 400 only*/
#define ITCHOUT 0xEE4 /* WO RW-600 */
#define ITTRIGOUT 0xEE8 /* WO RW-600 */
#define ITCHOUTACK 0xEEC /* RO CTI CSSoc 400 only*/
#define ITTRIGOUTACK 0xEF0 /* RO CTI CSSoc 400 only*/
#define ITCHIN 0xEF4 /* RO */
#define ITTRIGIN 0xEF8 /* RO */
/* management registers */
#define CTIDEVAFF0 0xFA8
#define CTIDEVAFF1 0xFAC
* CTI CSSoc 600 has a max of 32 trigger signals per direction.
* CTI CSSoc 400 has 8 IO triggers - other CTIs can be impl def.
* Max of in and out defined in the DEVID register.
* - pick up actual number used from .dts parameters if present.
* Group of related trigger signals
* @nr_sigs: number of signals in the group.
* @used_mask: bitmask representing the signal indexes in the group.
* @sig_types: array of types for the signals, length nr_sigs.
struct cti_trig_grp {
int nr_sigs;
u32 used_mask;
int sig_types[];
* Trigger connection - connection between a CTI and other (coresight) device
* lists input and output trigger signals for the device
* @con_in: connected CTIIN signals for the device.
* @con_out: connected CTIOUT signals for the device.
* @con_dev: coresight device connected to the CTI, NULL if not CS device
* @con_dev_name: name of connected device (CS or CPU)
* @node: entry node in list of connections.
* @con_attrs: Dynamic sysfs attributes specific to this connection.
* @attr_group: Dynamic attribute group created for this connection.
struct cti_trig_con {
struct cti_trig_grp *con_in;
struct cti_trig_grp *con_out;
struct coresight_device *con_dev;
const char *con_dev_name;
struct list_head node;
struct attribute **con_attrs;
struct attribute_group *attr_group;
* struct cti_device - description of CTI device properties.
* @nt_trig_con: Number of external devices connected to this device.
* @ctm_id: which CTM this device is connected to (by default it is
* assumed there is a single CTM per SoC, ID 0).
* @trig_cons: list of connections to this device.
* @cpu: CPU ID if associated with CPU, -1 otherwise.
* @con_groups: combined static and dynamic sysfs groups for trigger
* connections.
struct cti_device {
int nr_trig_con;
u32 ctm_id;
struct list_head trig_cons;
int cpu;
const struct attribute_group **con_groups;
* struct cti_config - configuration of the CTI device hardware
* @nr_trig_max: Max number of trigger signals implemented on device.
* (max of trig_in or trig_out) - from ID register.
* @nr_ctm_channels: number of available CTM channels - from ID register.
* @enable_req_count: CTI is enabled alongside >=1 associated devices.
* @hw_enabled: true if hw is currently enabled.
* @hw_powered: true if associated cpu powered on, or no cpu.
* @trig_in_use: bitfield of in triggers registered as in use.
* @trig_out_use: bitfield of out triggers registered as in use.
* @trig_out_filter: bitfield of out triggers that are blocked if filter
* enabled. Typically this would be dbgreq / restart on
* a core CTI.
* @trig_filter_enable: 1 if filtering enabled.
* @xtrig_rchan_sel: channel selection for xtrigger connection show.
* @ctiappset: CTI Software application channel set.
* @ctiinout_sel: register selector for INEN and OUTEN regs.
* @ctiinen: enable input trigger to a channel.
* @ctiouten: enable output trigger from a channel.
* @ctigate: gate channel output from CTI to CTM.
* @asicctl: asic control register.
struct cti_config {
/* hardware description */
int nr_ctm_channels;
int nr_trig_max;
/* cti enable control */
atomic_t enable_req_count;
bool hw_enabled;
bool hw_powered;
/* registered triggers and filtering */
u32 trig_in_use;
u32 trig_out_use;
u32 trig_out_filter;
bool trig_filter_enable;
u8 xtrig_rchan_sel;
/* cti cross trig programmable regs */
u32 ctiappset;
u8 ctiinout_sel;
u32 ctiinen[CTIINOUTEN_MAX];
u32 ctiouten[CTIINOUTEN_MAX];
u32 ctigate;
u32 asicctl;
* struct cti_drvdata - specifics for the CTI device
* @base: Memory mapped base address for this component..
* @csdev: Standard CoreSight device information.
* @ctidev: Extra information needed by the CTI/CTM framework.
* @spinlock: Control data access to one at a time.
* @config: Configuration data for this CTI device.
* @node: List entry of this device in the list of CTI devices.
* @csdev_release: release function for underlying coresight_device.
struct cti_drvdata {
void __iomem *base;
struct coresight_device *csdev;
struct cti_device ctidev;
spinlock_t spinlock;
struct cti_config config;
struct list_head node;
void (*csdev_release)(struct device *dev);
* Channel operation types.
enum cti_chan_op {
enum cti_trig_dir {
enum cti_chan_gate_op {
enum cti_chan_set_op {
/* private cti driver fns & vars */
extern const struct attribute_group *coresight_cti_groups[];
int cti_add_default_connection(struct device *dev,
struct cti_drvdata *drvdata);
int cti_add_connection_entry(struct device *dev, struct cti_drvdata *drvdata,
struct cti_trig_con *tc,
struct coresight_device *csdev,
const char *assoc_dev_name);
struct cti_trig_con *cti_allocate_trig_con(struct device *dev, int in_sigs,
int out_sigs);
int cti_enable(struct coresight_device *csdev);
int cti_disable(struct coresight_device *csdev);
void cti_write_all_hw_regs(struct cti_drvdata *drvdata);
void cti_write_intack(struct device *dev, u32 ackval);
void cti_write_single_reg(struct cti_drvdata *drvdata, int offset, u32 value);
int cti_channel_trig_op(struct device *dev, enum cti_chan_op op,
enum cti_trig_dir direction, u32 channel_idx,
u32 trigger_idx);
int cti_channel_gate_op(struct device *dev, enum cti_chan_gate_op op,
u32 channel_idx);
int cti_channel_setop(struct device *dev, enum cti_chan_set_op op,
u32 channel_idx);
int cti_create_cons_sysfs(struct device *dev, struct cti_drvdata *drvdata);
struct coresight_platform_data *
coresight_cti_get_platform_data(struct device *dev);
const char *cti_plat_get_node_name(struct fwnode_handle *fwnode);
/* cti powered and enabled */
static inline bool cti_active(struct cti_config *cfg)
return cfg->hw_powered && cfg->hw_enabled;