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/* Copyright (c) 2012 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.
*/
/* Host command module for Chrome EC */
#include "console.h"
#include "host_command.h"
#include "link_defs.h"
#include "lpc.h"
#include "ec_commands.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_SYSTEM, outstr)
#define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ## args)
#define TASK_EVENT_SLOT(n) TASK_EVENT_CUSTOM(1 << n)
static int host_command[2];
void host_command_received(int slot, int command)
{
/* TODO: should warn if we already think we're in a command */
/* If this is the reboot command, reboot immediately. This gives
* the host processor a way to unwedge the EC even if it's busy with
* some other command. */
if (command == EC_CMD_REBOOT) {
system_reset(1);
/* Reset should never return; if it does, post an error */
host_send_result(slot, EC_RES_ERROR);
return;
}
/* Save the command */
host_command[slot] = command;
/* Wake up the task to handle the command for the slot */
task_set_event(TASK_ID_HOSTCMD, TASK_EVENT_SLOT(slot), 0);
}
static int host_command_proto_version(uint8_t *data, int *resp_size)
{
struct ec_response_proto_version *r =
(struct ec_response_proto_version *)data;
r->version = EC_PROTO_VERSION;
*resp_size = sizeof(struct ec_response_proto_version);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_PROTO_VERSION, host_command_proto_version);
static int host_command_hello(uint8_t *data, int *resp_size)
{
struct ec_params_hello *p = (struct ec_params_hello *)data;
struct ec_response_hello *r = (struct ec_response_hello *)data;
uint32_t d = p->in_data;
r->out_data = d + 0x01020304;
*resp_size = sizeof(struct ec_response_hello);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_HELLO, host_command_hello);
static int host_command_read_test(uint8_t *data, int *resp_size)
{
struct ec_params_read_test *p = (struct ec_params_read_test *)data;
struct ec_response_read_test *r =
(struct ec_response_read_test *)data;
int offset = p->offset;
int size = p->size / sizeof(uint32_t);
int i;
if (size > ARRAY_SIZE(r->data))
return EC_RES_ERROR;
for (i = 0; i < size; i++)
r->data[i] = offset + i;
*resp_size = sizeof(struct ec_response_read_test);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_READ_TEST, host_command_read_test);
#ifdef CONFIG_LPC
/* ACPI query event handler. Note that the returned value is NOT actually
* an EC_RES enum; it's 0 if no event was pending, or the 1-based
* index of the lowest bit which was set. */
static int host_command_acpi_query_event(uint8_t *data, int *resp_size)
{
uint32_t events = lpc_get_host_events();
int i;
for (i = 0; i < 32; i++) {
if (events & (1 << i)) {
lpc_clear_host_events(1 << i);
return i + 1;
}
}
/* No events pending */
return 0;
}
DECLARE_HOST_COMMAND(EC_CMD_ACPI_QUERY_EVENT, host_command_acpi_query_event);
#endif
/* Finds a command by command number. Returns the command structure, or NULL if
* no match found. */
static const struct host_command *find_host_command(int command)
{
const struct host_command *cmd;
for (cmd = __hcmds; cmd < __hcmds_end; cmd++) {
if (command == cmd->command)
return cmd;
}
return NULL;
}
/* Handle a LPC command */
static void command_process(int slot)
{
int command = host_command[slot];
uint8_t *data = host_get_buffer(slot);
const struct host_command *cmd = find_host_command(command);
CPRINTF("[hostcmd%d 0x%02x]\n", slot, command);
if (cmd) {
int size = 0;
int res = cmd->handler(data, &size);
if ((res == EC_RES_SUCCESS) && size)
host_send_response(slot, data, size);
else
host_send_result(slot, res);
} else {
host_send_result(slot, EC_RES_INVALID_COMMAND);
}
}
/*****************************************************************************/
/* Initialization / task */
static int host_command_init(void)
{
host_command[0] = host_command[1] = -1;
return EC_SUCCESS;
}
void host_command_task(void)
{
host_command_init();
while (1) {
/* wait for the next command event */
int evt = task_wait_event(-1);
/* process it */
if (evt & TASK_EVENT_SLOT(0))
command_process(0);
if (evt & TASK_EVENT_SLOT(1))
command_process(1);
}
}
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