summaryrefslogtreecommitdiffstats
path: root/drivers/hwtracing/coresight/coresight-tmc.h
blob: dfaff077a7fc7f149a708dd418c190d6e2072db1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright(C) 2015 Linaro Limited. All rights reserved.
 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
 */

#ifndef _CORESIGHT_TMC_H
#define _CORESIGHT_TMC_H

#include <linux/miscdevice.h>

#define TMC_RSZ			0x004
#define TMC_STS			0x00c
#define TMC_RRD			0x010
#define TMC_RRP			0x014
#define TMC_RWP			0x018
#define TMC_TRG			0x01c
#define TMC_CTL			0x020
#define TMC_RWD			0x024
#define TMC_MODE		0x028
#define TMC_LBUFLEVEL		0x02c
#define TMC_CBUFLEVEL		0x030
#define TMC_BUFWM		0x034
#define TMC_RRPHI		0x038
#define TMC_RWPHI		0x03c
#define TMC_AXICTL		0x110
#define TMC_DBALO		0x118
#define TMC_DBAHI		0x11c
#define TMC_FFSR		0x300
#define TMC_FFCR		0x304
#define TMC_PSCR		0x308
#define TMC_ITMISCOP0		0xee0
#define TMC_ITTRFLIN		0xee8
#define TMC_ITATBDATA0		0xeec
#define TMC_ITATBCTR2		0xef0
#define TMC_ITATBCTR1		0xef4
#define TMC_ITATBCTR0		0xef8

/* register description */
/* TMC_CTL - 0x020 */
#define TMC_CTL_CAPT_EN		BIT(0)
/* TMC_STS - 0x00C */
#define TMC_STS_TMCREADY_BIT	2
#define TMC_STS_FULL		BIT(0)
#define TMC_STS_TRIGGERED	BIT(1)
/*
 * TMC_AXICTL - 0x110
 *
 * TMC AXICTL format for SoC-400
 *	Bits [0-1]	: ProtCtrlBit0-1
 *	Bits [2-5]	: CacheCtrlBits 0-3 (AXCACHE)
 *	Bit  6		: Reserved
 *	Bit  7		: ScatterGatherMode
 *	Bits [8-11]	: WrBurstLen
 *	Bits [12-31]	: Reserved.
 * TMC AXICTL format for SoC-600, as above except:
 *	Bits [2-5]	: AXI WCACHE
 *	Bits [16-19]	: AXI RCACHE
 *	Bits [20-31]	: Reserved
 */
#define TMC_AXICTL_CLEAR_MASK 0xfbf
#define TMC_AXICTL_ARCACHE_MASK (0xf << 16)

#define TMC_AXICTL_PROT_CTL_B0	BIT(0)
#define TMC_AXICTL_PROT_CTL_B1	BIT(1)
#define TMC_AXICTL_SCT_GAT_MODE	BIT(7)
#define TMC_AXICTL_WR_BURST_16	0xF00
/* Write-back Read and Write-allocate */
#define TMC_AXICTL_AXCACHE_OS	(0xf << 2)
#define TMC_AXICTL_ARCACHE_OS	(0xf << 16)

/* TMC_FFCR - 0x304 */
#define TMC_FFCR_FLUSHMAN_BIT	6
#define TMC_FFCR_EN_FMT		BIT(0)
#define TMC_FFCR_EN_TI		BIT(1)
#define TMC_FFCR_FON_FLIN	BIT(4)
#define TMC_FFCR_FON_TRIG_EVT	BIT(5)
#define TMC_FFCR_TRIGON_TRIGIN	BIT(8)
#define TMC_FFCR_STOP_ON_FLUSH	BIT(12)


#define TMC_DEVID_NOSCAT	BIT(24)

#define TMC_DEVID_AXIAW_VALID	BIT(16)
#define TMC_DEVID_AXIAW_SHIFT	17
#define TMC_DEVID_AXIAW_MASK	0x7f

enum tmc_config_type {
	TMC_CONFIG_TYPE_ETB,
	TMC_CONFIG_TYPE_ETR,
	TMC_CONFIG_TYPE_ETF,
};

enum tmc_mode {
	TMC_MODE_CIRCULAR_BUFFER,
	TMC_MODE_SOFTWARE_FIFO,
	TMC_MODE_HARDWARE_FIFO,
};

enum tmc_mem_intf_width {
	TMC_MEM_INTF_WIDTH_32BITS	= 1,
	TMC_MEM_INTF_WIDTH_64BITS	= 2,
	TMC_MEM_INTF_WIDTH_128BITS	= 4,
	TMC_MEM_INTF_WIDTH_256BITS	= 8,
};

/* TMC ETR Capability bit definitions */
#define TMC_ETR_SG			(0x1U << 0)
/* ETR has separate read/write cache encodings */
#define TMC_ETR_AXI_ARCACHE		(0x1U << 1)
/*
 * TMC_ETR_SAVE_RESTORE - Values of RRP/RWP/STS.Full are
 * retained when TMC leaves Disabled state, allowing us to continue
 * the tracing from a point where we stopped. This also implies that
 * the RRP/RWP/STS.Full should always be programmed to the correct
 * value. Unfortunately this is not advertised by the hardware,
 * so we have to rely on PID of the IP to detect the functionality.
 */
#define TMC_ETR_SAVE_RESTORE		(0x1U << 2)

/* Coresight SoC-600 TMC-ETR unadvertised capabilities */
#define CORESIGHT_SOC_600_ETR_CAPS	\
	(TMC_ETR_SAVE_RESTORE | TMC_ETR_AXI_ARCACHE)

/**
 * struct tmc_drvdata - specifics associated to an TMC component
 * @base:	memory mapped base address for this component.
 * @dev:	the device entity associated to this component.
 * @csdev:	component vitals needed by the framework.
 * @miscdev:	specifics to handle "/dev/xyz.tmc" entry.
 * @spinlock:	only one at a time pls.
 * @buf:	area of memory where trace data get sent.
 * @paddr:	DMA start location in RAM.
 * @vaddr:	virtual representation of @paddr.
 * @size:	trace buffer size.
 * @len:	size of the available trace.
 * @mode:	how this TMC is being used.
 * @config_type: TMC variant, must be of type @tmc_config_type.
 * @memwidth:	width of the memory interface databus, in bytes.
 * @trigger_cntr: amount of words to store after a trigger.
 * @etr_caps:	Bitmask of capabilities of the TMC ETR, inferred from the
 *		device configuration register (DEVID)
 */
struct tmc_drvdata {
	void __iomem		*base;
	struct device		*dev;
	struct coresight_device	*csdev;
	struct miscdevice	miscdev;
	spinlock_t		spinlock;
	bool			reading;
	char			*buf;
	dma_addr_t		paddr;
	void __iomem		*vaddr;
	u32			size;
	u32			len;
	u32			mode;
	enum tmc_config_type	config_type;
	enum tmc_mem_intf_width	memwidth;
	u32			trigger_cntr;
	u32			etr_caps;
};

/* Generic functions */
void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata);
void tmc_flush_and_stop(struct tmc_drvdata *drvdata);
void tmc_enable_hw(struct tmc_drvdata *drvdata);
void tmc_disable_hw(struct tmc_drvdata *drvdata);

/* ETB/ETF functions */
int tmc_read_prepare_etb(struct tmc_drvdata *drvdata);
int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata);
extern const struct coresight_ops tmc_etb_cs_ops;
extern const struct coresight_ops tmc_etf_cs_ops;

/* ETR functions */
int tmc_read_prepare_etr(struct tmc_drvdata *drvdata);
int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata);
extern const struct coresight_ops tmc_etr_cs_ops;


#define TMC_REG_PAIR(name, lo_off, hi_off)				\
static inline u64							\
tmc_read_##name(struct tmc_drvdata *drvdata)				\
{									\
	return coresight_read_reg_pair(drvdata->base, lo_off, hi_off);	\
}									\
static inline void							\
tmc_write_##name(struct tmc_drvdata *drvdata, u64 val)			\
{									\
	coresight_write_reg_pair(drvdata->base, val, lo_off, hi_off);	\
}

TMC_REG_PAIR(rrp, TMC_RRP, TMC_RRPHI)
TMC_REG_PAIR(rwp, TMC_RWP, TMC_RWPHI)
TMC_REG_PAIR(dba, TMC_DBALO, TMC_DBAHI)

/* Initialise the caps from unadvertised static capabilities of the device */
static inline void tmc_etr_init_caps(struct tmc_drvdata *drvdata, u32 dev_caps)
{
	WARN_ON(drvdata->etr_caps);
	drvdata->etr_caps = dev_caps;
}

static inline void tmc_etr_set_cap(struct tmc_drvdata *drvdata, u32 cap)
{
	drvdata->etr_caps |= cap;
}

static inline bool tmc_etr_has_cap(struct tmc_drvdata *drvdata, u32 cap)
{
	return !!(drvdata->etr_caps & cap);
}

#endif