]>
git.ipfire.org Git - thirdparty/u-boot.git/blob - common/iotrace.c
2 * Copyright (c) 2014 Google, Inc.
4 * SPDX-License-Identifier: GPL-2.0+
13 DECLARE_GLOBAL_DATA_PTR
;
15 /* Support up to the machine word length for now */
16 typedef ulong iovalue_t
;
28 * struct iotrace_record - Holds a single I/O trace record
30 * @flags: I/O access type
31 * @addr: Address of access
32 * @value: Value written or read
34 struct iotrace_record
{
35 enum iotrace_flags flags
;
41 * struct iotrace - current trace status and checksum
43 * @start: Start address of iotrace buffer
44 * @size: Size of iotrace buffer in bytes
45 * @offset: Current write offset into iotrace buffer
46 * @crc32: Current value of CRC chceksum of trace records
47 * @enabled: true if enabled, false if disabled
49 static struct iotrace
{
57 static void add_record(int flags
, const void *ptr
, ulong value
)
59 struct iotrace_record srec
, *rec
= &srec
;
62 * We don't support iotrace before relocation. Since the trace buffer
63 * is set up by a command, it can't be enabled at present. To change
64 * this we would need to set the iotrace buffer at build-time. See
65 * lib/trace.c for how this might be done if you are interested.
67 if (!(gd
->flags
& GD_FLG_RELOC
) || !iotrace
.enabled
)
70 /* Store it if there is room */
71 if (iotrace
.offset
+ sizeof(*rec
) < iotrace
.size
) {
72 rec
= (struct iotrace_record
*)map_sysmem(
73 iotrace
.start
+ iotrace
.offset
,
78 rec
->addr
= map_to_sysmem(ptr
);
81 /* Update our checksum */
82 iotrace
.crc32
= crc32(iotrace
.crc32
, (unsigned char *)rec
,
85 iotrace
.offset
+= sizeof(struct iotrace_record
);
88 u32
iotrace_readl(const void *ptr
)
93 add_record(IOT_32
| IOT_READ
, ptr
, v
);
98 void iotrace_writel(ulong value
, const void *ptr
)
100 add_record(IOT_32
| IOT_WRITE
, ptr
, value
);
104 u16
iotrace_readw(const void *ptr
)
109 add_record(IOT_16
| IOT_READ
, ptr
, v
);
114 void iotrace_writew(ulong value
, const void *ptr
)
116 add_record(IOT_16
| IOT_WRITE
, ptr
, value
);
120 u8
iotrace_readb(const void *ptr
)
125 add_record(IOT_8
| IOT_READ
, ptr
, v
);
130 void iotrace_writeb(ulong value
, const void *ptr
)
132 add_record(IOT_8
| IOT_WRITE
, ptr
, value
);
136 void iotrace_reset_checksum(void)
141 u32
iotrace_get_checksum(void)
143 return iotrace
.crc32
;
146 void iotrace_set_enabled(int enable
)
148 iotrace
.enabled
= enable
;
151 int iotrace_get_enabled(void)
153 return iotrace
.enabled
;
156 void iotrace_set_buffer(ulong start
, ulong size
)
158 iotrace
.start
= start
;
164 void iotrace_get_buffer(ulong
*start
, ulong
*size
, ulong
*offset
, ulong
*count
)
166 *start
= iotrace
.start
;
167 *size
= iotrace
.size
;
168 *offset
= iotrace
.offset
;
169 *count
= iotrace
.offset
/ sizeof(struct iotrace_record
);