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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "atomic.h"
#include "cache.h"
#include "common.h"
#include "console.h"
#include "hooks.h"
#include "hostcmd.h"
#include "ipi_chip.h"
#include "registers.h"
#include "system.h"
#include "task.h"
#include "util.h"
#include "video.h"
#define CPRINTF(format, args...) cprintf(CC_IPI, format, ##args)
#define CPRINTS(format, args...) cprints(CC_IPI, format, ##args)
static uint8_t init_done;
static struct mutex ipi_lock;
static struct ipc_shared_obj *const ipi_send_buf =
(struct ipc_shared_obj *)CONFIG_IPC_SHARED_OBJ_ADDR;
static struct ipc_shared_obj *const ipi_recv_buf =
(struct ipc_shared_obj *)(CONFIG_IPC_SHARED_OBJ_ADDR +
sizeof(struct ipc_shared_obj));
static uint32_t disable_irq_count, saved_int_mask;
void ipi_disable_irq(void)
{
if (atomic_read_add(&disable_irq_count, 1) == 0)
saved_int_mask = read_clear_int_mask();
}
void ipi_enable_irq(void)
{
if (atomic_read_sub(&disable_irq_count, 1) == 1)
set_int_mask(saved_int_mask);
}
static int ipi_is_busy(void)
{
return SCP_SCP2APMCU_IPC_SET & IPC_SCP2HOST;
}
static void ipi_wake_ap(int32_t id)
{
if (id >= IPI_COUNT)
return;
if (*ipi_wakeup_table[id])
SCP_SCP2SPM_IPC_SET = IPC_SCP2HOST;
}
int ipi_send(int32_t id, const void *buf, uint32_t len, int wait)
{
int ret;
if (!init_done) {
CPRINTS("IPI has not initialized");
return EC_ERROR_BUSY;
}
if (in_interrupt_context()) {
CPRINTS("invoke %s() in ISR context", __func__);
return EC_ERROR_BUSY;
}
if (len > sizeof(ipi_send_buf->buffer)) {
CPRINTS("data length exceeds limitation");
return EC_ERROR_INVAL;
}
ipi_disable_irq();
mutex_lock(&ipi_lock);
if (ipi_is_busy()) {
/*
* If the following conditions meet,
* 1) There is an IPI pending in AP.
* 2) The incoming IPI is a wakeup IPI.
* then it assumes that AP is in suspend state.
* Send a AP wakeup request to SPM.
*
* The incoming IPI will be checked if it's a wakeup source.
*/
ipi_wake_ap(id);
CPRINTS("IPI busy, id=%d", id);
ret = EC_ERROR_BUSY;
goto error;
}
ipi_send_buf->id = id;
ipi_send_buf->len = len;
memcpy(ipi_send_buf->buffer, buf, len);
/* flush memory cache (if any) */
cache_flush_dcache_range((uintptr_t)ipi_send_buf,
sizeof(*ipi_send_buf));
/* interrupt AP to handle the message */
ipi_wake_ap(id);
SCP_SCP2APMCU_IPC_SET = IPC_SCP2HOST;
if (wait)
while (ipi_is_busy())
;
ret = EC_SUCCESS;
error:
mutex_unlock(&ipi_lock);
ipi_enable_irq();
return ret;
}
static void ipi_enable_deferred(void)
{
struct scp_run_t scp_run;
int ret;
init_done = 1;
/* inform AP that SCP is up */
scp_run.signaled = 1;
strncpy(scp_run.fw_ver, system_get_version(EC_IMAGE_RW),
SCP_FW_VERSION_LEN);
scp_run.dec_capability = video_get_dec_capability();
scp_run.enc_capability = video_get_enc_capability();
ret = ipi_send(SCP_IPI_INIT, (void *)&scp_run, sizeof(scp_run), 1);
if (ret) {
CPRINTS("failed to send initialization IPC messages");
init_done = 0;
return;
}
#ifdef HAS_TASK_HOSTCMD
hostcmd_init();
#endif
task_enable_irq(SCP_IRQ_GIPC_IN0);
}
DECLARE_DEFERRED(ipi_enable_deferred);
static void ipi_init(void)
{
memset(ipi_send_buf, 0, sizeof(struct ipc_shared_obj));
memset(ipi_recv_buf, 0, sizeof(struct ipc_shared_obj));
/* enable IRQ after all tasks are up */
hook_call_deferred(&ipi_enable_deferred_data, 0);
}
DECLARE_HOOK(HOOK_INIT, ipi_init, HOOK_PRIO_DEFAULT);
static void ipi_handler(void)
{
if (ipi_recv_buf->id >= IPI_COUNT) {
CPRINTS("invalid IPI, id=%d", ipi_recv_buf->id);
return;
}
CPRINTS("IPI %d", ipi_recv_buf->id);
ipi_handler_table[ipi_recv_buf->id](
ipi_recv_buf->id, ipi_recv_buf->buffer, ipi_recv_buf->len);
}
static void irq_group7_handler(void)
{
extern volatile int ec_int;
if (SCP_GIPC_IN_SET & GIPC_IN(0)) {
ipi_handler();
SCP_GIPC_IN_CLR = GIPC_IN(0);
asm volatile ("fence.i" ::: "memory");
task_clear_pending_irq(ec_int);
}
}
DECLARE_IRQ(7, irq_group7_handler, 0);
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