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// SPDX-License-Identifier: GPL-2.0
/*
* GXP notification implementation on top of the mailbox driver.
*
* Copyright (C) 2021 Google LLC
*/
#include <linux/bitops.h>
#include "gxp-mailbox.h"
#include "gxp-mailbox-driver.h"
#include "gxp-notification.h"
int gxp_notification_register_handler(struct gxp_dev *gxp, uint core,
enum gxp_notification_to_host_type type,
struct work_struct *handler)
{
struct gxp_mailbox *mailbox;
if (core >= GXP_NUM_CORES || type >= HOST_NOTIF_MAX)
return -EINVAL;
mailbox = gxp->mailbox_mgr->mailboxes[core];
if (!mailbox)
return -ENODEV;
return gxp_mailbox_register_interrupt_handler(mailbox, type, handler);
}
int gxp_notification_unregister_handler(struct gxp_dev *gxp, uint core,
enum gxp_notification_to_host_type type)
{
struct gxp_mailbox *mailbox;
if (core >= GXP_NUM_CORES || type >= HOST_NOTIF_MAX)
return -EINVAL;
mailbox = gxp->mailbox_mgr->mailboxes[core];
if (!mailbox)
return-ENODEV;
return gxp_mailbox_unregister_interrupt_handler(mailbox, type);
}
int gxp_notification_send(struct gxp_dev *gxp, uint core,
enum gxp_notification_to_core_type type)
{
struct gxp_mailbox *mailbox;
/*
* The mailbox submodule handles outgoing command interrupts directly
* so `CORE_NOTIF_MAILBOX_COMMAND` is not a valid input for this
* implementation.
*/
if (core >= GXP_NUM_CORES || type == CORE_NOTIF_MAILBOX_COMMAND ||
type >= GXP_MAILBOX_INT_BIT_COUNT || type >= CORE_NOTIF_MAX)
return -EINVAL;
mailbox = gxp->mailbox_mgr->mailboxes[core];
if (!mailbox)
return -ENODEV;
gxp_mailbox_generate_device_interrupt(mailbox, BIT(type));
return 0;
}
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