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/*
* Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2020-2022, Xilinx, Inc. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* Xilinx IPI agent registers access management
*/
#include <errno.h>
#include <string.h>
#include <common/debug.h>
#include <common/runtime_svc.h>
#include <lib/bakery_lock.h>
#include <lib/mmio.h>
#include <ipi.h>
#include <plat_private.h>
/*********************************************************************
* Macros definitions
********************************************************************/
/* IPI registers offsets macros */
#define IPI_TRIG_OFFSET 0x00U
#define IPI_OBR_OFFSET 0x04U
#define IPI_ISR_OFFSET 0x10U
#define IPI_IMR_OFFSET 0x14U
#define IPI_IER_OFFSET 0x18U
#define IPI_IDR_OFFSET 0x1CU
/* IPI register start offset */
#define IPI_REG_BASE(I) (ipi_table[(I)].ipi_reg_base)
/* IPI register bit mask */
#define IPI_BIT_MASK(I) (ipi_table[(I)].ipi_bit_mask)
/* IPI configuration table */
static const struct ipi_config *ipi_table;
/* Total number of IPI */
static uint32_t ipi_total;
/**
* ipi_config_init() - Initialize IPI configuration data
*
* @ipi_config_table - IPI configuration table
* @ipi_total - Total number of IPI available
*
*/
void ipi_config_table_init(const struct ipi_config *ipi_config_table,
uint32_t total_ipi)
{
ipi_table = ipi_config_table;
ipi_total = total_ipi;
}
/* is_ipi_mb_within_range() - verify if IPI mailbox is within range
*
* @local - local IPI ID
* @remote - remote IPI ID
*
* return - 1 if within range, 0 if not
*/
static inline int is_ipi_mb_within_range(uint32_t local, uint32_t remote)
{
int ret = 1;
if (remote >= ipi_total || local >= ipi_total) {
ret = 0;
}
return ret;
}
/**
* ipi_mb_validate() - validate IPI mailbox access
*
* @local - local IPI ID
* @remote - remote IPI ID
* @is_secure - indicate if the requester is from secure software
*
* return - 0 success, negative value for errors
*/
int ipi_mb_validate(uint32_t local, uint32_t remote, unsigned int is_secure)
{
int ret = 0;
if (!is_ipi_mb_within_range(local, remote)) {
ret = -EINVAL;
} else if (IPI_IS_SECURE(local) && !is_secure) {
ret = -EPERM;
} else if (IPI_IS_SECURE(remote) && !is_secure) {
ret = -EPERM;
} else {
/* To fix the misra 15.7 warning */
}
return ret;
}
/**
* ipi_mb_open() - Open IPI mailbox.
*
* @local - local IPI ID
* @remote - remote IPI ID
*
*/
void ipi_mb_open(uint32_t local, uint32_t remote)
{
mmio_write_32(IPI_REG_BASE(local) + IPI_IDR_OFFSET,
IPI_BIT_MASK(remote));
mmio_write_32(IPI_REG_BASE(local) + IPI_ISR_OFFSET,
IPI_BIT_MASK(remote));
}
/**
* ipi_mb_release() - Open IPI mailbox.
*
* @local - local IPI ID
* @remote - remote IPI ID
*
*/
void ipi_mb_release(uint32_t local, uint32_t remote)
{
mmio_write_32(IPI_REG_BASE(local) + IPI_IDR_OFFSET,
IPI_BIT_MASK(remote));
}
/**
* ipi_mb_enquire_status() - Enquire IPI mailbox status
*
* @local - local IPI ID
* @remote - remote IPI ID
*
* return - 0 idle, positive value for pending sending or receiving,
* negative value for errors
*/
int ipi_mb_enquire_status(uint32_t local, uint32_t remote)
{
int ret = 0U;
uint32_t status;
status = mmio_read_32(IPI_REG_BASE(local) + IPI_OBR_OFFSET);
if (status & IPI_BIT_MASK(remote)) {
ret |= IPI_MB_STATUS_SEND_PENDING;
}
status = mmio_read_32(IPI_REG_BASE(local) + IPI_ISR_OFFSET);
if (status & IPI_BIT_MASK(remote)) {
ret |= IPI_MB_STATUS_RECV_PENDING;
}
return ret;
}
/* ipi_mb_notify() - Trigger IPI mailbox notification
*
* @local - local IPI ID
* @remote - remote IPI ID
* @is_blocking - if to trigger the notification in blocking mode or not.
*
* It sets the remote bit in the IPI agent trigger register.
*
*/
void ipi_mb_notify(uint32_t local, uint32_t remote, uint32_t is_blocking)
{
uint32_t status;
mmio_write_32(IPI_REG_BASE(local) + IPI_TRIG_OFFSET,
IPI_BIT_MASK(remote));
if (is_blocking) {
do {
status = mmio_read_32(IPI_REG_BASE(local) +
IPI_OBR_OFFSET);
} while (status & IPI_BIT_MASK(remote));
}
}
/* ipi_mb_ack() - Ack IPI mailbox notification from the other end
*
* @local - local IPI ID
* @remote - remote IPI ID
*
* It will clear the remote bit in the isr register.
*
*/
void ipi_mb_ack(uint32_t local, uint32_t remote)
{
mmio_write_32(IPI_REG_BASE(local) + IPI_ISR_OFFSET,
IPI_BIT_MASK(remote));
}
/* ipi_mb_disable_irq() - Disable IPI mailbox notification interrupt
*
* @local - local IPI ID
* @remote - remote IPI ID
*
* It will mask the remote bit in the idr register.
*
*/
void ipi_mb_disable_irq(uint32_t local, uint32_t remote)
{
mmio_write_32(IPI_REG_BASE(local) + IPI_IDR_OFFSET,
IPI_BIT_MASK(remote));
}
/* ipi_mb_enable_irq() - Enable IPI mailbox notification interrupt
*
* @local - local IPI ID
* @remote - remote IPI ID
*
* It will mask the remote bit in the idr register.
*
*/
void ipi_mb_enable_irq(uint32_t local, uint32_t remote)
{
mmio_write_32(IPI_REG_BASE(local) + IPI_IER_OFFSET,
IPI_BIT_MASK(remote));
}
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