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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 "common.h"
#include "console.h"
#include "ec_commands.h"
#include "host_command.h"
#include "link_defs.h"
#include "lpc.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_CMD_PENDING TASK_EVENT_CUSTOM(1)
static int pending_cmd;
#ifndef CONFIG_LPC
static uint8_t host_memmap[EC_MEMMAP_SIZE];
#endif
uint8_t *host_get_memmap(int offset)
{
#ifdef CONFIG_LPC
return lpc_get_memmap_range() + offset;
#else
return host_memmap + offset;
#endif
}
void host_command_received(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_response(EC_RES_ERROR, NULL, 0);
return;
}
/* Save the command */
pending_cmd = command;
/* Wake up the task to handle the command */
task_set_event(TASK_ID_HOSTCMD, TASK_EVENT_CMD_PENDING, 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);
#ifndef CONFIG_LPC
/*
* Host command to read memory map is not needed on LPC, because LPC can
* directly map the data to the host's memory space.
*/
static int host_command_read_memmap(uint8_t *data, int *resp_size)
{
struct ec_params_read_memmap *p = (struct ec_params_read_memmap *)data;
struct ec_response_read_memmap *r =
(struct ec_response_read_memmap *)data;
/* Copy params out of data before we overwrite it with output */
uint8_t offset = p->offset;
uint8_t size = p->size;
if (size > sizeof(r->data) || offset > EC_MEMMAP_SIZE ||
offset + size > EC_MEMMAP_SIZE)
return EC_RES_INVALID_PARAM;
memcpy(r->data, host_get_memmap(offset), size);
*resp_size = size;
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_READ_MEMMAP, host_command_read_memmap);
#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;
}
enum ec_status host_command_process(int command, uint8_t *data,
int *response_size)
{
const struct host_command *cmd = find_host_command(command);
enum ec_status res = EC_RES_INVALID_COMMAND;
CPRINTF("[%T hostcmd 0x%02x]\n", command);
*response_size = 0;
if (cmd)
res = cmd->handler(data, response_size);
return res;
}
/*****************************************************************************/
/* Initialization / task */
static int host_command_init(void)
{
pending_cmd = -1;
host_set_single_event(EC_HOST_EVENT_INTERFACE_READY);
CPRINTF("[%T hostcmd init 0x%x]\n", host_get_events());
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_CMD_PENDING) {
int size = 0; /* Default to no response data */
int res = host_command_process(pending_cmd,
host_get_buffer(),
&size);
host_send_response(res, host_get_buffer(), size);
}
}
}
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