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lib: utils/mailbox: Add simple FDT based mailbox framework

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Add a simple FDT based mailbox framework which is built on top of the generic
mailbox library. The phandle of FDT mailbox DT node is treated as the unique
mailbox controller ID which is required by the generic mailbox library. The
FDT based mailbox drivers will be probed on-demand from fdt_mailbox_request_chan()
called by the mailbox client drivers.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
This commit is contained in:
Anup Patel
2024-08-06 10:02:04 +05:30
committed by Anup Patel
parent ad846a7cb8
commit 2244a34f0d
5 changed files with 145 additions and 0 deletions
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35
include/sbi_utils/mailbox/fdt_mailbox.h Normal file
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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 Ventana Micro Systems Inc.
*
* Authors:
* Anup Patel <apatel@ventanamicro.com>
*/
#ifndef __FDT_MAILBOX_H__
#define __FDT_MAILBOX_H__
#include <sbi_utils/fdt/fdt_driver.h>
#include <sbi_utils/mailbox/mailbox.h>
struct fdt_phandle_args;
/** FDT based mailbox driver */
struct fdt_mailbox {
struct fdt_driver driver;
int (*xlate)(struct mbox_controller *mbox,
const struct fdt_phandle_args *pargs,
u32 *out_chan_args);
};
/** Request a mailbox channel using "mboxes" DT property of client DT node */
int fdt_mailbox_request_chan(const void *fdt, int nodeoff, int index,
struct mbox_chan **out_chan);
/** Simple xlate function to convert one mailbox FDT cell into channel args */
int fdt_mailbox_simple_xlate(struct mbox_controller *mbox,
const struct fdt_phandle_args *pargs,
u32 *out_chan_args);
#endif