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/*
* Copyright (c) 2013-2020, Arm Limited and Contributors. All rights reserved.
* Copyright (c) 2019-2022, Xilinx, Inc. All rights reserved.
* Copyright (c) 2022-2023, Advanced Micro Devices, Inc. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch_helpers.h>
#include <lib/bakery_lock.h>
#include <lib/mmio.h>
#include <lib/spinlock.h>
#include <ipi.h>
#include <plat_ipi.h>
#include <plat_private.h>
#include <plat/common/platform.h>
#include "pm_defs.h"
#include "pm_ipi.h"
#define ERROR_CODE_MASK (0xFFFFU)
#define PM_OFFSET (0U)
/*
* ARM v8.2, the cache will turn off automatically when cpu
* power down. Therefore, there is no doubt to use the spin_lock here.
*/
#if !HW_ASSISTED_COHERENCY
DEFINE_BAKERY_LOCK(pm_secure_lock);
static inline void pm_ipi_lock_get(void)
{
bakery_lock_get(&pm_secure_lock);
}
static inline void pm_ipi_lock_release(void)
{
bakery_lock_release(&pm_secure_lock);
}
#else
spinlock_t pm_secure_lock;
static inline void pm_ipi_lock_get(void)
{
spin_lock(&pm_secure_lock);
}
static inline void pm_ipi_lock_release(void)
{
spin_unlock(&pm_secure_lock);
}
#endif
/**
* pm_ipi_init() - Initialize IPI peripheral for communication with
* remote processor.
* @proc: Pointer to the processor who is initiating request.
*
* Return: On success, the initialization function must return 0.
* Any other return value will cause the framework to ignore
* the service.
*
* Called from pm_setup initialization function.
*/
void pm_ipi_init(const struct pm_proc *proc)
{
ipi_mb_open(proc->ipi->local_ipi_id, proc->ipi->remote_ipi_id);
}
/**
* pm_ipi_send_common() - Sends IPI request to the remote processor.
* @proc: Pointer to the processor who is initiating request.
* @payload: API id and call arguments to be written in IPI buffer.
* @is_blocking: if to trigger the notification in blocking mode or not.
*
* Send an IPI request to the power controller. Caller needs to hold
* the 'pm_secure_lock' lock.
*
* Return: Returns status, either success or error+reason.
*
*/
static enum pm_ret_status pm_ipi_send_common(const struct pm_proc *proc,
uint32_t payload[PAYLOAD_ARG_CNT],
uint32_t is_blocking)
{
uint32_t offset = PM_OFFSET;
uintptr_t buffer_base = proc->ipi->buffer_base +
IPI_BUFFER_TARGET_REMOTE_OFFSET +
IPI_BUFFER_REQ_OFFSET;
#if IPI_CRC_CHECK
payload[PAYLOAD_CRC_POS] = calculate_crc(payload, IPI_W0_TO_W6_SIZE);
#endif
/* Write payload into IPI buffer */
for (size_t i = 0; i < PAYLOAD_ARG_CNT; i++) {
mmio_write_32(buffer_base + offset, payload[i]);
offset += PAYLOAD_ARG_SIZE;
}
/* Generate IPI to remote processor */
ipi_mb_notify(proc->ipi->local_ipi_id, proc->ipi->remote_ipi_id,
is_blocking);
return PM_RET_SUCCESS;
}
/**
* pm_ipi_send_non_blocking() - Sends IPI request to the remote processor
* without blocking notification.
* @proc: Pointer to the processor who is initiating request.
* @payload: API id and call arguments to be written in IPI buffer.
*
* Send an IPI request to the power controller.
*
* Return: Returns status, either success or error+reason.
*
*/
enum pm_ret_status pm_ipi_send_non_blocking(const struct pm_proc *proc,
uint32_t payload[PAYLOAD_ARG_CNT])
{
enum pm_ret_status ret;
pm_ipi_lock_get();
ret = pm_ipi_send_common(proc, payload, IPI_NON_BLOCKING);
pm_ipi_lock_release();
return ret;
}
/**
* pm_ipi_send() - Sends IPI request to the remote processor.
* @proc: Pointer to the processor who is initiating request.
* @payload: API id and call arguments to be written in IPI buffer.
*
* Send an IPI request to the power controller.
*
* Return: Returns status, either success or error+reason.
*
*/
enum pm_ret_status pm_ipi_send(const struct pm_proc *proc,
uint32_t payload[PAYLOAD_ARG_CNT])
{
enum pm_ret_status ret;
pm_ipi_lock_get();
ret = pm_ipi_send_common(proc, payload, IPI_BLOCKING);
pm_ipi_lock_release();
return ret;
}
/**
* pm_ipi_buff_read() - Reads IPI response after remote processor has handled
* interrupt.
* @proc: Pointer to the processor who is waiting and reading response.
* @value: Used to return value from IPI buffer element (optional).
* @count: Number of values to return in @value.
*
* Return: Returns status, either success or error+reason.
*
*/
static enum pm_ret_status pm_ipi_buff_read(const struct pm_proc *proc,
uint32_t *value, size_t count)
{
size_t i;
enum pm_ret_status ret;
#if IPI_CRC_CHECK
uint32_t *payload_ptr = value;
size_t j;
uint32_t response_payload[PAYLOAD_ARG_CNT];
#endif
uintptr_t buffer_base = proc->ipi->buffer_base +
IPI_BUFFER_TARGET_REMOTE_OFFSET +
IPI_BUFFER_RESP_OFFSET;
/*
* Read response from IPI buffer
* buf-0: success or error+reason
* buf-1: value
* buf-2: unused
* buf-3: unused
*/
for (i = 1; i <= count; i++) {
*value = mmio_read_32(buffer_base + (i * PAYLOAD_ARG_SIZE));
value++;
}
ret = mmio_read_32(buffer_base);
#if IPI_CRC_CHECK
for (j = 0; j < PAYLOAD_ARG_CNT; j++) {
response_payload[j] = mmio_read_32(buffer_base +
(j * PAYLOAD_ARG_SIZE));
}
if (response_payload[PAYLOAD_CRC_POS] !=
calculate_crc(response_payload, IPI_W0_TO_W6_SIZE)) {
NOTICE("ERROR in CRC response payload value:0x%x\n",
response_payload[PAYLOAD_CRC_POS]);
ret = PM_RET_ERROR_INVALID_CRC;
/* Payload data is invalid as CRC validation failed
* Clear the payload to avoid leakage of data to upper layers
*/
memset(payload_ptr, 0, count);
}
#endif
return ret;
}
/**
* pm_ipi_buff_read_callb() - Callback function that reads value from
* ipi response buffer.
* @value: Used to return value from IPI buffer element.
* @count: Number of values to return in @value.
*
* This callback function fills requested data in @value from ipi response
* buffer.
*
* Return: Returns status, either success or error.
*
*/
enum pm_ret_status pm_ipi_buff_read_callb(uint32_t *value, size_t count)
{
size_t i;
#if IPI_CRC_CHECK
uint32_t *payload_ptr = value;
size_t j;
unsigned int response_payload[PAYLOAD_ARG_CNT] = {0};
#endif
uintptr_t buffer_base = IPI_BUFFER_REMOTE_BASE +
IPI_BUFFER_TARGET_LOCAL_OFFSET +
IPI_BUFFER_REQ_OFFSET;
enum pm_ret_status ret = PM_RET_SUCCESS;
if (count > IPI_BUFFER_MAX_WORDS) {
count = IPI_BUFFER_MAX_WORDS;
}
for (i = 0; i <= count; i++) {
*value = mmio_read_32(buffer_base + (i * PAYLOAD_ARG_SIZE));
value++;
}
#if IPI_CRC_CHECK
for (j = 0; j < PAYLOAD_ARG_CNT; j++) {
response_payload[j] = mmio_read_32(buffer_base +
(j * PAYLOAD_ARG_SIZE));
}
if (response_payload[PAYLOAD_CRC_POS] !=
calculate_crc(response_payload, IPI_W0_TO_W6_SIZE)) {
NOTICE("ERROR in CRC response payload value:0x%x\n",
response_payload[PAYLOAD_CRC_POS]);
ret = PM_RET_ERROR_INVALID_CRC;
/* Payload data is invalid as CRC validation failed
* Clear the payload to avoid leakage of data to upper layers
*/
memset(payload_ptr, 0, count);
}
#endif
return ret;
}
/**
* pm_ipi_send_sync() - Sends IPI request to the remote processor.
* @proc: Pointer to the processor who is initiating request.
* @payload: API id and call arguments to be written in IPI buffer.
* @value: Used to return value from IPI buffer element (optional).
* @count: Number of values to return in @value.
*
* Send an IPI request to the power controller and wait for it to be handled.
*
* Return: Returns status, either success or error+reason and, optionally,
* @value.
*
*/
enum pm_ret_status pm_ipi_send_sync(const struct pm_proc *proc,
uint32_t payload[PAYLOAD_ARG_CNT],
uint32_t *value, size_t count)
{
enum pm_ret_status ret;
pm_ipi_lock_get();
ret = pm_ipi_send_common(proc, payload, IPI_BLOCKING);
if (ret != PM_RET_SUCCESS) {
goto unlock;
}
ret = ERROR_CODE_MASK & (pm_ipi_buff_read(proc, value, count));
unlock:
pm_ipi_lock_release();
return ret;
}
void pm_ipi_irq_enable(const struct pm_proc *proc)
{
ipi_mb_enable_irq(proc->ipi->local_ipi_id, proc->ipi->remote_ipi_id);
}
void pm_ipi_irq_clear(const struct pm_proc *proc)
{
ipi_mb_ack(proc->ipi->local_ipi_id, proc->ipi->remote_ipi_id);
}
uint32_t pm_ipi_irq_status(const struct pm_proc *proc)
{
int32_t ret;
ret = ipi_mb_enquire_status(proc->ipi->local_ipi_id,
proc->ipi->remote_ipi_id);
if (ret & IPI_MB_STATUS_RECV_PENDING) {
return 1;
} else {
return 0;
}
}
#if IPI_CRC_CHECK
uint32_t calculate_crc(uint32_t payload[PAYLOAD_ARG_CNT], uint32_t bufsize)
{
uint32_t crcinit = CRC_INIT_VALUE;
uint32_t order = CRC_ORDER;
uint32_t polynom = CRC_POLYNOM;
uint32_t i, j, c, bit, datain, crcmask, crchighbit;
uint32_t crc = crcinit;
crcmask = ((uint32_t)((1U << (order - 1U)) - 1U) << 1U) | 1U;
crchighbit = (uint32_t)(1U << (order - 1U));
for (i = 0U; i < bufsize; i++) {
datain = mmio_read_8((unsigned long)payload + i);
c = datain;
j = 0x80U;
while (j != 0U) {
bit = crc & crchighbit;
crc <<= 1U;
if (0U != (c & j))
bit ^= crchighbit;
if (bit != 0U)
crc ^= polynom;
j >>= 1U;
}
crc &= crcmask;
}
return crc;
}
#endif