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/* Copyright 2020 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 <sys/util.h>
#include "console.h"
#include "i2c.h"
#include "i2c/i2c.h"
/*
* The named-i2c-ports node is required by the I2C shim
*/
#if !DT_NODE_EXISTS(DT_PATH(named_i2c_ports))
#error I2C shim requires the named-i2c-ports node to be defined.
#endif
/*
* Initialize device bindings in i2c_devices.
* This macro should be called from within DT_FOREACH_CHILD.
*/
#define INIT_DEV_BINDING(id) \
[I2C_PORT(id)] = DEVICE_DT_GET(DT_PHANDLE(id, i2c_port)),
#define INIT_REMOTE_PORTS(id) \
[I2C_PORT(id)] = DT_PROP_OR(id, remote_port, -1),
#define I2C_PORT_INIT(id) \
{ \
.name = DT_LABEL(id), \
.port = I2C_PORT(id), \
},
/*
* Long term we will not need these, for now they're needed to get things to
* build since these extern symbols are usually defined in
* board/${BOARD}/board.c.
*
* Since all the ports will eventually be handled by device tree. This will
* be removed at that point.
*/
const struct i2c_port_t i2c_ports[] = {
DT_FOREACH_CHILD(DT_PATH(named_i2c_ports), I2C_PORT_INIT)
};
const unsigned int i2c_ports_used = ARRAY_SIZE(i2c_ports);
static const int i2c_remote_ports[I2C_PORT_COUNT] = {
DT_FOREACH_CHILD(DT_PATH(named_i2c_ports), INIT_REMOTE_PORTS)
};
static int i2c_physical_ports[I2C_PORT_COUNT];
static const struct device *i2c_devices[I2C_PORT_COUNT] = {
DT_FOREACH_CHILD(DT_PATH(named_i2c_ports), INIT_DEV_BINDING)
};
static int init_device_bindings(const struct device *device)
{
ARG_UNUSED(device);
/*
* The EC application may lock the I2C bus for more than a single
* I2C transaction. Initialize the i2c_physical_ports[] array to map
* each named-i2c-ports child to the physical bus assignment.
*
* TODO(b/199918263): zephyr: Optimize I2C mutexes
* Modify the port_mutex[] array defined by i2c_controller.c
* so that only mutexes for unique physical ports are created to
* save space.
*/
i2c_physical_ports[0] = 0;
for (int child = 1; child < I2C_PORT_COUNT; child++) {
for (int phys_port = 0; phys_port < I2C_PORT_COUNT;
phys_port++) {
if (i2c_devices[child] == i2c_devices[phys_port]) {
i2c_physical_ports[child] = phys_port;
break;
}
}
}
return 0;
}
SYS_INIT(init_device_bindings, POST_KERNEL, 51);
const struct device *i2c_get_device_for_port(const int port)
{
if (port < 0 || port >= I2C_PORT_COUNT)
return NULL;
return i2c_devices[port];
}
int i2c_get_port_from_remote_port(int remote_port)
{
for (int port = 0; port < I2C_PORT_COUNT; port++) {
if (i2c_remote_ports[port] == remote_port)
return port;
}
/*
* Remote port is not defined, return 1:1 mapping to support TCPC
* firmware updates, which always query the EC for the correct I2C
* port number.
*/
return remote_port;
}
int i2c_get_physical_port(int enum_port)
{
int i2c_port = i2c_physical_ports[enum_port];
/*
* Return -1 for caller if physical port is not defined or the
* port number is out of port_mutex space.
* Please ensure the caller won't change anything if -1 received.
*/
return (i2c_port < I2C_PORT_COUNT) ? i2c_port : -1;
}
#ifdef CONFIG_PLATFORM_EC_CONSOLE_CMD_I2C_PORTMAP
static int command_i2c_portmap(int argc, char **argv)
{
int i;
ccprintf("Zephyr physical I2C ports (%d):\n", I2C_PORT_COUNT);
for (i = 0; i < I2C_PORT_COUNT; i++) {
ccprintf(" %d : %d\n", i, i2c_physical_ports[i]);
}
ccprintf("Zephyr remote I2C ports (%d):\n", I2C_PORT_COUNT);
for (i = 0; i < I2C_PORT_COUNT; i++) {
ccprintf(" %d : %d\n", i, i2c_remote_ports[i]);
}
return EC_RES_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(i2c_portmap, command_i2c_portmap, NULL,
"Show I2C port mapping");
#endif /* CONFIG_PLATFORM_EC_CONSOLE_CMD_I2C_PORTMAP */
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