1/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
  2 *
  3 * This program is free software; you can redistribute it and/or modify
  4 * it under the terms of the GNU General Public License version 2 and
  5 * only version 2 as published by the Free Software Foundation.
  6 *
  7 * This program is distributed in the hope that it will be useful,
  8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 10 * GNU General Public License for more details.
 11 */
 12
 13#ifndef _CORESIGHT_PRIV_H
 14#define _CORESIGHT_PRIV_H
 15
 16#include <linux/bitops.h>
 17#include <linux/io.h>
 18#include <linux/coresight.h>
 19#include <linux/pm_runtime.h>
 20
 21/*
 22 * Coresight management registers (0xf00-0xfcc)
 23 * 0xfa0 - 0xfa4: Management	registers in PFTv1.0
 24 *		  Trace		registers in PFTv1.1
 25 */
 26#define CORESIGHT_ITCTRL	0xf00
 27#define CORESIGHT_CLAIMSET	0xfa0
 28#define CORESIGHT_CLAIMCLR	0xfa4
 29#define CORESIGHT_LAR		0xfb0
 30#define CORESIGHT_LSR		0xfb4
 31#define CORESIGHT_AUTHSTATUS	0xfb8
 32#define CORESIGHT_DEVID		0xfc8
 33#define CORESIGHT_DEVTYPE	0xfcc
 34
 35#define TIMEOUT_US		100
 36#define BMVAL(val, lsb, msb)	((val & GENMASK(msb, lsb)) >> lsb)
 37
 38#define ETM_MODE_EXCL_KERN	BIT(30)
 39#define ETM_MODE_EXCL_USER	BIT(31)
 40
 41typedef u32 (*coresight_read_fn)(const struct device *, u32 offset);
 42#define coresight_simple_func(type, func, name, offset)			\
 43static ssize_t name##_show(struct device *_dev,				\
 44			   struct device_attribute *attr, char *buf)	\
 45{									\
 46	type *drvdata = dev_get_drvdata(_dev->parent);			\
 47	coresight_read_fn fn = func;					\
 48	u32 val;							\
 49	pm_runtime_get_sync(_dev->parent);				\
 50	if (fn)								\
 51		val = fn(_dev->parent, offset);				\
 52	else								\
 53		val = readl_relaxed(drvdata->base + offset);		\
 54	pm_runtime_put_sync(_dev->parent);				\
 55	return scnprintf(buf, PAGE_SIZE, "0x%x\n", val);		\
 56}									\
 57static DEVICE_ATTR_RO(name)
 58
 59enum etm_addr_type {
 60	ETM_ADDR_TYPE_NONE,
 61	ETM_ADDR_TYPE_SINGLE,
 62	ETM_ADDR_TYPE_RANGE,
 63	ETM_ADDR_TYPE_START,
 64	ETM_ADDR_TYPE_STOP,
 65};
 66
 67enum cs_mode {
 68	CS_MODE_DISABLED,
 69	CS_MODE_SYSFS,
 70	CS_MODE_PERF,
 71};
 72
 73/**
 74 * struct cs_buffer - keep track of a recording session' specifics
 75 * @cur:	index of the current buffer
 76 * @nr_pages:	max number of pages granted to us
 77 * @offset:	offset within the current buffer
 78 * @data_size:	how much we collected in this run
 79 * @lost:	other than zero if we had a HW buffer wrap around
 80 * @snapshot:	is this run in snapshot mode
 81 * @data_pages:	a handle the ring buffer
 82 */
 83struct cs_buffers {
 84	unsigned int		cur;
 85	unsigned int		nr_pages;
 86	unsigned long		offset;
 87	local_t			data_size;
 88	local_t			lost;
 89	bool			snapshot;
 90	void			**data_pages;
 91};
 92
 93static inline void CS_LOCK(void __iomem *addr)
 94{
 95	do {
 96		/* Wait for things to settle */
 97		mb();
 98		writel_relaxed(0x0, addr + CORESIGHT_LAR);
 99	} while (0);
100}
101
102static inline void CS_UNLOCK(void __iomem *addr)
103{
104	do {
105		writel_relaxed(CORESIGHT_UNLOCK, addr + CORESIGHT_LAR);
106		/* Make sure everyone has seen this */
107		mb();
108	} while (0);
109}
110
111void coresight_disable_path(struct list_head *path);
112int coresight_enable_path(struct list_head *path, u32 mode);
113struct coresight_device *coresight_get_sink(struct list_head *path);
114struct coresight_device *coresight_get_enabled_sink(bool reset);
115struct list_head *coresight_build_path(struct coresight_device *csdev,
116				       struct coresight_device *sink);
117void coresight_release_path(struct list_head *path);
118
119#ifdef CONFIG_CORESIGHT_SOURCE_ETM3X
120extern int etm_readl_cp14(u32 off, unsigned int *val);
121extern int etm_writel_cp14(u32 off, u32 val);
122#else
123static inline int etm_readl_cp14(u32 off, unsigned int *val) { return 0; }
124static inline int etm_writel_cp14(u32 off, u32 val) { return 0; }
125#endif
126
127#endif