// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020-21 Intel Corporation.
*/
#include "iosm_ipc_imem.h"
#include "iosm_ipc_protocol.h"
#include "iosm_ipc_protocol_ops.h"
#include "iosm_ipc_pm.h"
#include "iosm_ipc_task_queue.h"
int ipc_protocol_tq_msg_send(struct iosm_protocol *ipc_protocol,
enum ipc_msg_prep_type msg_type,
union ipc_msg_prep_args *prep_args,
struct ipc_rsp *response)
{
int index = ipc_protocol_msg_prep(ipc_protocol->imem, msg_type,
prep_args);
/* Store reference towards caller specified response in response ring
* and signal CP
*/
if (index >= 0 && index < IPC_MEM_MSG_ENTRIES) {
ipc_protocol->rsp_ring[index] = response;
ipc_protocol_msg_hp_update(ipc_protocol->imem);
}
return index;
}
/* Callback for message send */
static int ipc_protocol_tq_msg_send_cb(struct iosm_imem *ipc_imem, int arg,
void *msg, size_t size)
{
struct ipc_call_msg_send_args *send_args = msg;
struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol;
return ipc_protocol_tq_msg_send(ipc_protocol, send_args->msg_type,
send_args->prep_args,
send_args->response);
}
/* Remove reference to a response. This is typically used when a requestor timed
* out and is no longer interested in the response.
*/
static int ipc_protocol_tq_msg_remove(struct iosm_imem *ipc_imem, int arg,
void *msg, size_t size)
{
struct iosm_protocol *ipc_protocol = ipc_imem->ipc_protocol;
ipc_protocol->rsp_ring[arg] = NULL;
return 0;
}
int ipc_protocol_msg_send(struct iosm_protocol *ipc_protocol,
enum ipc_msg_prep_type prep,
union ipc_msg_prep_args *prep_args)
{
struct ipc_call_msg_send_args send_args;
unsigned int exec_timeout;
struct ipc_rsp response;
int index;
exec_timeout = (ipc_protocol_get_ap_exec_stage(ipc_protocol) ==
IPC_MEM_EXEC_STAGE_RUN ?
IPC_MSG_COMPLETE_RUN_DEFAULT_TIMEOUT :
IPC_MSG_COMPLETE_BOOT_DEFAULT_TIMEOUT);
/* Trap if called from non-preemptible context */
might_sleep();
response.status = IPC_MEM_MSG_CS_INVALID;
init_completion(&response.completion);
send_args.msg_type = prep;
send_args.prep_args = prep_args;
send_args.response = &response;
/* Allocate and prepare message to be sent in tasklet context.
* A positive index returned form tasklet_call references the message
* in case it needs to be cancelled when there is a timeout.
*/
index = ipc_task_queue_send_task(ipc_protocol->imem,
ipc_protocol_tq_msg_send_cb, 0,
&send_args, 0, true);
if (index < 0) {
dev_err(ipc_protocol->dev, "msg %d failed", prep);
return index;
}
/* Wait for the device to respond to the message */
switch (wait_for_completion_timeout(&response.completion,
msecs_to_jiffies(exec_timeout))) {
case 0:
/* Timeout, there was no response from the device.
* Remove the reference to the local response completion
* object as we are no longer interested in the response.
*/
ipc_task_queue_send_task(ipc_protocol->imem,
ipc_protocol_tq_msg_remove, index,
NULL, 0, true);
dev_err(ipc_protocol->dev, "msg timeout");
ipc_uevent_send(ipc_protocol->pcie->dev, UEVENT_MDM_TIMEOUT);
break;
default:
/* We got a response in time; check completion status: */
if (response.status != IPC_MEM_MSG_CS_SUCCESS) {
dev_err(ipc_protocol->dev,
"msg completion status error %d",
response.status);
return -EIO;
}
}
return 0;
}
static int ipc_protocol_msg_send_host_sleep(struct iosm_protocol *ipc_protocol,
u32 state)
{
union ipc_msg_prep_args prep_args = {
.sleep.target = 0,
.sleep.state = state,
};
return ipc_protocol_msg_send(ipc_protocol, IPC_MSG_PREP_SLEEP,
&prep_args);
}
void ipc_protocol_doorbell_trigger(struct iosm_protocol *ipc_protocol,
u32 identifier)
{
ipc_pm_signal_hpda_doorbell(&ipc_protocol->pm, identifier, true);
}
bool ipc_protocol_pm_dev_sleep_handle(struct iosm_protocol *ipc_protocol)
{
u32 ipc_status = ipc_protocol_get_ipc_status(ipc_protocol);
u32 requested;
if (ipc_status != IPC_MEM_DEVICE_IPC_RUNNING) {
dev_err(ipc_protocol->dev,
"irq ignored, CP IPC state is %d, should be RUNNING",
ipc_status);
/* Stop further processing. */
return false;
}
/* Get a copy of the requested PM state by the device and the local
* device PM state.
*/
requested = ipc_protocol_pm_dev_get_sleep_notification(ipc_protocol);
return ipc_pm_dev_slp_notification(&ipc_protocol->pm, requested);
}
static int ipc_protocol_tq_wakeup_dev_slp(struct iosm_imem *ipc_imem, int arg,
void *msg, size_t size)
{
struct iosm_pm *ipc_pm = &ipc_imem->ipc_protocol->pm;
/* Wakeup from device sleep if it is not ACTIVE */
ipc_pm_trigger(ipc_pm, IPC_PM_UNIT_HS, true);
ipc_pm_trigger(ipc_pm, IPC_PM_UNIT_HS, false);
return 0;
}
void ipc_protocol_s2idle_sleep(struct iosm_protocol *ipc_protocol, bool sleep)
{
ipc_pm_set_s2idle_sleep(&ipc_protocol->pm, sleep);
}
bool ipc_protocol_suspend(struct iosm_protocol *ipc_protocol)
{
if (!ipc_pm_prepare_host_sleep(&ipc_protocol->pm))
goto err;
ipc_task_queue_send_task(ipc_protocol->imem,
ipc_protocol_tq_wakeup_dev_slp, 0, NULL, 0,
true);
if (!ipc_pm_wait_for_device_active(&ipc_protocol->pm)) {
ipc_uevent_send(ipc_protocol->pcie->dev, UEVENT_MDM_TIMEOUT);
goto err;
}
/* Send the sleep message for sync sys calls. */
dev_dbg(ipc_protocol->dev, "send TARGET_HOST, ENTER_SLEEP");
if (ipc_protocol_msg_send_host_sleep(ipc_protocol,
IPC_HOST_SLEEP_ENTER_SLEEP)) {
/* Sending ENTER_SLEEP message failed, we are still active */
ipc_protocol->pm.host_pm_state = IPC_MEM_HOST_PM_ACTIVE;
goto err;
}
ipc_protocol->pm.host_pm_state = IPC_MEM_HOST_PM_SLEEP;
return true;
err:
return false;
}
bool ipc_protocol_resume(struct iosm_protocol *ipc_protocol)
{
if (!ipc_pm_prepare_host_active(&ipc_protocol->pm))
return false;
dev_dbg(ipc_protocol->dev, "send TARGET_HOST, EXIT_SLEEP");
if (ipc_protocol_msg_send_host_sleep(ipc_protocol,
IPC_HOST_SLEEP_EXIT_SLEEP)) {
ipc_protocol->pm.host_pm_state = IPC_MEM_HOST_PM_SLEEP;
return false;
}
ipc_protocol->pm.host_pm_state = IPC_MEM_HOST_PM_ACTIVE;
return true;
}
struct iosm_protocol *ipc_protocol_init(struct iosm_imem *ipc_imem)
{
struct iosm_protocol *ipc_protocol =
kzalloc(sizeof(*ipc_protocol), GFP_KERNEL);
struct ipc_protocol_context_info *p_ci;
u64 addr;
if (!ipc_protocol)
return NULL;
ipc_protocol->dev = ipc_imem->dev;
ipc_protocol->pcie = ipc_imem->pcie;
ipc_protocol->imem = ipc_imem;
ipc_protocol->p_ap_shm = NULL;
ipc_protocol->phy_ap_shm = 0;
ipc_protocol->old_msg_tail = 0;
ipc_protocol->p_ap_shm =
dma_alloc_coherent(&ipc_protocol->pcie->pci->dev,
sizeof(*ipc_protocol->p_ap_shm),
&ipc_protocol->phy_ap_shm, GFP_KERNEL);
if (!ipc_protocol->p_ap_shm) {
dev_err(ipc_protocol->dev, "pci shm alloc error");
kfree(ipc_protocol);
return NULL;
}
/* Prepare the context info for CP. */
addr = ipc_protocol->phy_ap_shm;
p_ci = &ipc_protocol->p_ap_shm->ci;
p_ci->device_info_addr =
addr + offsetof(struct ipc_protocol_ap_shm, device_info);
p_ci->head_array =
addr + offsetof(struct ipc_protocol_ap_shm, head_array);
p_ci->tail_array =
addr + offsetof(struct ipc_protocol_ap_shm, tail_array);
p_ci->msg_head = addr + offsetof(struct ipc_protocol_ap_shm, msg_head);
p_ci->msg_tail = addr + offsetof(struct ipc_protocol_ap_shm, msg_tail);
p_ci->msg_ring_addr =
addr + offsetof(struct ipc_protocol_ap_shm, msg_ring);
p_ci->msg_ring_entries = cpu_to_le16(IPC_MEM_MSG_ENTRIES);
p_ci->msg_irq_vector = IPC_MSG_IRQ_VECTOR;
p_ci->device_info_irq_vector = IPC_DEVICE_IRQ_VECTOR;
ipc_mmio_set_contex_info_addr(ipc_imem->mmio, addr);
ipc_pm_init(ipc_protocol);
return ipc_protocol;
}
void ipc_protocol_deinit(struct iosm_protocol *proto)
{
dma_free_coherent(&proto->pcie->pci->dev, sizeof(*proto->p_ap_shm),
proto->p_ap_shm, proto->phy_ap_shm);
ipc_pm_deinit(proto);
kfree(proto);
}