/**
* Handle write to ACPI I/O port
*
* @param is_cmd Is write command (is_cmd=1) or data (is_cmd=0)
*/
static void handle_acpi_write(int is_cmd)
{
uint8_t value, result;
/* Read command/data; this clears the FRMH status bit. */
value = NPCX_HIPMDI(PMC_ACPI);
/* Handle whatever this was. */
if (acpi_ap_to_ec(is_cmd, value, &result))
NPCX_HIPMDO(PMC_ACPI) = result;
/*
* ACPI 5.0-12.6.1: Generate SCI for Input Buffer Empty / Output Buffer
* Full condition on the kernel channel.
*/
lpc_generate_sci();
}
/**
* Handle write to ACPI I/O port
*
* @param is_cmd Is write command (is_cmd=1) or data (is_cmd=0)
*/
static void handle_acpi_write(int is_cmd)
{
uint8_t value, result;
/* Set processing flag before reading command byte */
SET_BIT(NPCX_HIPMST(PMC_ACPI), NPCX_HIPMST_F0);
/* Read command/data; this clears the FRMH status bit. */
value = NPCX_HIPMDI(PMC_ACPI);
/* Handle whatever this was. */
if (acpi_ap_to_ec(is_cmd, value, &result))
NPCX_HIPMDO(PMC_ACPI) = result;
/* Clear processing flag */
CLEAR_BIT(NPCX_HIPMST(PMC_ACPI), NPCX_HIPMST_F0);
/*
* ACPI 5.0-12.6.1: Generate SCI for Input Buffer Empty / Output Buffer
* Full condition on the kernel channel.
*/
lpc_generate_sci();
}
/**
* Handle write to host command I/O ports.
*
* @param is_cmd Is write command (1) or data (0)?
*/
static void handle_host_write(int is_cmd)
{
/* Set processing flag before reading command byte */
SET_BIT(NPCX_HIPMST(PMC_HOST_CMD), 2);
/*
* Read the command byte. This clears the FRMH bit in
* the status byte.
*/
host_cmd_args.command = NPCX_HIPMDI(PMC_HOST_CMD);
host_cmd_args.result = EC_RES_SUCCESS;
host_cmd_args.send_response = lpc_send_response;
host_cmd_flags = lpc_host_args->flags;
/* See if we have an old or new style command */
if (host_cmd_args.command == EC_COMMAND_PROTOCOL_3) {
lpc_packet.send_response = lpc_send_response_packet;
lpc_packet.request = (const void *)shm_mem_host_cmd;
lpc_packet.request_temp = params_copy;
lpc_packet.request_max = sizeof(params_copy);
/* Don't know the request size so pass in the entire buffer */
lpc_packet.request_size = EC_LPC_HOST_PACKET_SIZE;
lpc_packet.response = (void *)shm_mem_host_cmd;
lpc_packet.response_max = EC_LPC_HOST_PACKET_SIZE;
lpc_packet.response_size = 0;
lpc_packet.driver_result = EC_RES_SUCCESS;
host_packet_receive(&lpc_packet);
return;
} else if (host_cmd_flags & EC_HOST_ARGS_FLAG_FROM_HOST) {
/* Version 2 (link) style command */
int size = lpc_host_args->data_size;
int csum, i;
/* Clear processing flag */
CLEAR_BIT(NPCX_HIPMST(PMC_HOST_CMD), 2);
host_cmd_args.version = lpc_host_args->command_version;
host_cmd_args.params = params_copy;
host_cmd_args.params_size = size;
host_cmd_args.response = cmd_params;
host_cmd_args.response_max = EC_PROTO2_MAX_PARAM_SIZE;
host_cmd_args.response_size = 0;
/* Verify params size */
if (size > EC_PROTO2_MAX_PARAM_SIZE) {
host_cmd_args.result = EC_RES_INVALID_PARAM;
} else {
const uint8_t *src = cmd_params;
uint8_t *copy = params_copy;
/*
* Verify checksum and copy params out of LPC space.
* This ensures the data acted on by the host command
* handler can't be changed by host writes after the
* checksum is verified.
*/
csum = host_cmd_args.command +
host_cmd_flags +
host_cmd_args.version +
host_cmd_args.params_size;
for (i = 0; i < size; i++) {
csum += *src;
*(copy++) = *(src++);
}
if ((uint8_t)csum != lpc_host_args->checksum)
host_cmd_args.result = EC_RES_INVALID_CHECKSUM;
}
} else {
/* Old style command, now unsupported */
host_cmd_args.result = EC_RES_INVALID_COMMAND;
/* Clear processing flag */
CLEAR_BIT(NPCX_HIPMST(PMC_HOST_CMD), 2);
}
/* Hand off to host command handler */
host_command_received(&host_cmd_args);
}
