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/* Copyright 2019 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "console.h"
#include "i2c.h"
#include "stddef.h"
#include "stdbool.h"
#include "util.h"
#define CPUTS(outstr) cputs(CC_I2C, outstr)
#define CPRINTS(format, args...) cprints(CC_I2C, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_I2C, format, ## args)
struct i2c_trace_range {
bool enabled;
int port;
int slave_addr_lo; /* Inclusive */
int slave_addr_hi; /* Inclusive */
};
static struct i2c_trace_range trace_entries[8];
void i2c_trace_notify(int port, uint16_t slave_addr_flags,
int direction, const uint8_t *data, size_t size)
{
size_t i;
uint16_t addr = I2C_GET_ADDR(slave_addr_flags);
for (i = 0; i < ARRAY_SIZE(trace_entries); i++)
if (trace_entries[i].enabled
&& trace_entries[i].port == port
&& trace_entries[i].slave_addr_lo <= addr
&& trace_entries[i].slave_addr_hi >= addr)
goto trace_enabled;
return;
trace_enabled:
CPRINTF("i2c: %s %d:0x%X ",
direction ? "read" : "write",
port,
addr);
for (i = 0; i < size; i++)
CPRINTF("%02X ", data[i]);
CPRINTF("\n");
}
static int command_i2ctrace_list(void)
{
size_t i;
ccprintf("id port address\n");
ccprintf("-- ---- -------\n");
for (i = 0; i < ARRAY_SIZE(trace_entries); i++) {
if (trace_entries[i].enabled) {
ccprintf("%2d %4d 0x%X",
i,
trace_entries[i].port,
trace_entries[i].slave_addr_lo);
if (trace_entries[i].slave_addr_hi
!= trace_entries[i].slave_addr_lo)
ccprintf(" to 0x%X",
trace_entries[i].slave_addr_hi);
ccprintf("\n");
}
}
return EC_SUCCESS;
}
static int command_i2ctrace_disable(size_t id)
{
if (id >= ARRAY_SIZE(trace_entries))
return EC_ERROR_PARAM2;
trace_entries[id].enabled = 0;
return EC_SUCCESS;
}
static int command_i2ctrace_enable(int port, int slave_addr_lo,
int slave_addr_hi)
{
struct i2c_trace_range *t;
struct i2c_trace_range *new_entry = NULL;
if (port >= i2c_ports_used)
return EC_ERROR_PARAM2;
if (slave_addr_lo > slave_addr_hi)
return EC_ERROR_PARAM3;
/*
* Scan thru existing entries to see if there is one we can
* extend instead of making a new entry
*/
for (t = trace_entries;
t < trace_entries + ARRAY_SIZE(trace_entries);
t++) {
if (t->enabled && t->port == port) {
/* Subset of existing range, do nothing */
if (t->slave_addr_lo <= slave_addr_lo &&
t->slave_addr_hi >= slave_addr_hi)
return EC_SUCCESS;
/* Extends exising range on both directions, replace */
if (t->slave_addr_lo >= slave_addr_lo &&
t->slave_addr_hi <= slave_addr_hi) {
t->enabled = 0;
return command_i2ctrace_enable(
port, slave_addr_lo, slave_addr_hi);
}
/* Extends existing range below */
if (t->slave_addr_lo - 1 <= slave_addr_hi &&
t->slave_addr_hi >= slave_addr_hi) {
t->enabled = 0;
return command_i2ctrace_enable(
port,
slave_addr_lo,
t->slave_addr_hi);
}
/* Extends existing range above */
if (t->slave_addr_lo <= slave_addr_lo &&
t->slave_addr_hi + 1 >= slave_addr_lo) {
t->enabled = 0;
return command_i2ctrace_enable(
port,
t->slave_addr_lo,
slave_addr_hi);
}
} else if (!t->enabled && !new_entry) {
new_entry = t;
}
}
/* We need to allocate a new entry */
if (new_entry) {
new_entry->enabled = 1;
new_entry->port = port;
new_entry->slave_addr_lo = slave_addr_lo;
new_entry->slave_addr_hi = slave_addr_hi;
return EC_SUCCESS;
}
ccprintf("No space to allocate new trace entry. Delete some first.\n");
return EC_ERROR_MEMORY_ALLOCATION;
}
static int command_i2ctrace(int argc, char **argv)
{
int id_or_port;
int address_low;
int address_high;
char *end;
if (argc < 2)
return EC_ERROR_PARAM_COUNT;
if (!strcasecmp(argv[1], "list") && argc == 2)
return command_i2ctrace_list();
if (argc < 3)
return EC_ERROR_PARAM_COUNT;
id_or_port = strtoi(argv[2], &end, 0);
if (*end || id_or_port < 0)
return EC_ERROR_PARAM2;
if (!strcasecmp(argv[1], "disable") && argc == 3)
return command_i2ctrace_disable(id_or_port);
if (!strcasecmp(argv[1], "enable")) {
address_low = strtoi(argv[3], &end, 0);
if (*end || address_low < 0)
return EC_ERROR_PARAM3;
if (argc == 4) {
address_high = address_low;
} else if (argc == 5) {
address_high = strtoi(argv[4], &end, 0);
if (*end || address_high < 0)
return EC_ERROR_PARAM4;
} else {
return EC_ERROR_PARAM_COUNT;
}
return command_i2ctrace_enable(
id_or_port, address_low, address_high);
}
return EC_ERROR_PARAM1;
}
DECLARE_CONSOLE_COMMAND(i2ctrace,
command_i2ctrace,
"[list | disable <id> | enable <port> <address> | "
"enable <port> <address-low> <address-high>]",
"Trace I2C transactions");
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