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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Handle FSP DPO (Delayed Power Off) event notification
*/
#include <skiboot.h>
#include <console.h>
#include <fsp.h>
#include <device.h>
#include <stdio.h>
#include <timebase.h>
#include <opal.h>
#include <opal-msg.h>
#define PREFIX "FSPDPO: "
#define DPO_CMD_SGN_BYTE0 0xf4 /* Byte[0] signature */
#define DPO_CMD_SGN_BYTE1 0x20 /* Byte[1] signature */
#define DPO_TIMEOUT 2700 /* 45 minutes in seconds */
static bool fsp_dpo_pending = false;
unsigned long fsp_dpo_init_tb = 0;
/*
* OPAL DPO interface
*
* Returns zero if DPO is not active, positive value indicating number
* of seconds remaining for a forced system shutdown. This will enable
* the host to schedule for shutdown voluntarily before timeout occurs.
*/
static int64_t fsp_opal_get_dpo_status(int64_t *dpo_timeout)
{
int64_t timeout = 0;
if (fsp_dpo_init_tb && fsp_dpo_pending)
timeout = DPO_TIMEOUT - tb_to_secs(mftb() - fsp_dpo_init_tb);
*dpo_timeout = timeout;
return OPAL_SUCCESS;
}
/* Process FSP DPO init message */
static void fsp_process_dpo(struct fsp_msg *msg)
{
u32 cmd = FSP_RSP_INIT_DPO;
int rc;
/* DPO message does not have the correct signatures */
if ((msg->data.bytes[0] != DPO_CMD_SGN_BYTE0)
|| (msg->data.bytes[1] != DPO_CMD_SGN_BYTE1)) {
printf(PREFIX "Message signatures did not match\n");
cmd |= FSP_STATUS_INVALID_CMD;
fsp_queue_msg(fsp_mkmsg(cmd, 0), fsp_freemsg);
return;
}
/* Sapphire is already in "DPO pending" state */
if (fsp_dpo_pending) {
printf(PREFIX "OPAL is already in DPO pending state\n");
cmd |= FSP_STATUS_INVALID_DPOSTATE;
fsp_queue_msg(fsp_mkmsg(cmd, 0), fsp_freemsg);
return;
}
/* Record the DPO init time */
fsp_dpo_init_tb = mftb();
/* Inform the host about DPO */
rc = opal_queue_msg(OPAL_MSG_DPO, NULL, NULL);
if (rc) {
printf(PREFIX "OPAL message queuing failed\n");
cmd |= FSP_STATUS_GENERIC_ERROR;
fsp_queue_msg(fsp_mkmsg(cmd, 0), fsp_freemsg);
return;
}
/* Acknowledge the FSP on DPO */
fsp_queue_msg(fsp_mkmsg(cmd, 0), fsp_freemsg);
fsp_dpo_pending = true;
/*
* Sapphire is now in DPO pending state. After first detecting DPO
* condition from Sapphire, the host will have 45 minutes to prepare
* the system for shutdown. The host must take all necessary actions
* required in that regard and at the end shutdown itself. The host
* shutdown sequence eventually will make the call OPAL_CEC_POWER_DOWN
* which in turn ask the FSP to shutdown the CEC. If the FSP does not
* receive the cec power down command from Sapphire within 45 minutes,
* it will assume that the host and the Sapphire has processed the DPO
* sequence successfully and hence force power off the system.
*/
}
/* Handle DPO sub-command from FSP */
static bool fsp_dpo_message(u32 cmd_sub_mod, struct fsp_msg *msg)
{
if (cmd_sub_mod == FSP_CMD_INIT_DPO) {
printf(PREFIX "SP initiated Delayed Power Off (DPO)\n");
fsp_process_dpo(msg);
return true;
}
return false;
}
static struct fsp_client fsp_dpo_client = {
.message = fsp_dpo_message,
};
void fsp_dpo_init(void)
{
fsp_register_client(&fsp_dpo_client, FSP_MCLASS_SERVICE);
opal_register(OPAL_GET_DPO_STATUS, fsp_opal_get_dpo_status, 1);
printf(PREFIX "FSP DPO support initialized\n");
}
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