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/*
* Copyright (C) 2018 Marvell International Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
* https://spdx.org/licenses
*/
#include <debug.h>
#include <mmio.h>
#include <psci.h>
#include <string.h>
#include <mss_pm_ipc.h>
/*
* SISR is 32 bit interrupt register representing 32 interrupts
*
* +======+=============+=============+
* + Bits + 31 + 30 - 00 +
* +======+=============+=============+
* + Desc + MSS Msg Int + Reserved +
* +======+=============+=============+
*/
#define MSS_SISR (MVEBU_REGS_BASE + 0x5800D0)
#define MSS_SISTR (MVEBU_REGS_BASE + 0x5800D8)
#define MSS_MSG_INT_MASK (0x80000000)
#define MSS_TIMER_BASE (MVEBU_REGS_BASE_MASK + 0x580110)
#define MSS_TRIGGER_TIMEOUT (2000)
/*****************************************************************************
* mss_pm_ipc_msg_send
*
* DESCRIPTION: create and transmit IPC message
*****************************************************************************
*/
int mss_pm_ipc_msg_send(unsigned int channel_id, unsigned int msg_id,
const psci_power_state_t *target_state)
{
/* Transmit IPC message */
#ifndef DISABLE_CLUSTER_LEVEL
mv_pm_ipc_msg_tx(channel_id, msg_id,
(unsigned int)target_state->pwr_domain_state[
MPIDR_AFFLVL1]);
#else
mv_pm_ipc_msg_tx(channel_id, msg_id, 0);
#endif
return 0;
}
/*****************************************************************************
* mss_pm_ipc_msg_trigger
*
* DESCRIPTION: Trigger IPC message interrupt to MSS
*****************************************************************************
*/
int mss_pm_ipc_msg_trigger(void)
{
unsigned int timeout;
unsigned int t_end;
unsigned int t_start = mmio_read_32(MSS_TIMER_BASE);
mmio_write_32(MSS_SISR, MSS_MSG_INT_MASK);
do {
/* wait while SCP process incoming interrupt */
if (mmio_read_32(MSS_SISTR) != MSS_MSG_INT_MASK)
break;
/* check timeout */
t_end = mmio_read_32(MSS_TIMER_BASE);
timeout = ((t_start > t_end) ?
(t_start - t_end) : (t_end - t_start));
if (timeout > MSS_TRIGGER_TIMEOUT) {
ERROR("PM MSG Trigger Timeout\n");
break;
}
} while (1);
return 0;
}
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