// SPDX-License-Identifier: GPL-2.0
/*
* Endpoint Function Driver to implement Non-Transparent Bridge functionality
* Between PCI RC and EP
*
* Copyright (C) 2020 Texas Instruments
* Copyright (C) 2022 NXP
*
* Based on pci-epf-ntb.c
* Author: Frank Li <Frank.Li@nxp.com>
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*/
/*
* +------------+ +---------------------------------------+
* | | | |
* +------------+ | +--------------+
* | NTB | | | NTB |
* | NetDev | | | NetDev |
* +------------+ | +--------------+
* | NTB | | | NTB |
* | Transfer | | | Transfer |
* +------------+ | +--------------+
* | | | | |
* | PCI NTB | | | |
* | EPF | | | |
* | Driver | | | PCI Virtual |
* | | +---------------+ | NTB Driver |
* | | | PCI EP NTB |<------>| |
* | | | FN Driver | | |
* +------------+ +---------------+ +--------------+
* | | | | | |
* | PCI Bus | <-----> | PCI EP Bus | | Virtual PCI |
* | | PCI | | | Bus |
* +------------+ +---------------+--------+--------------+
* PCIe Root Port PCI EP
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci-epc.h>
#include <linux/pci-epf.h>
#include <linux/ntb.h>
static struct workqueue_struct *kpcintb_workqueue;
#define COMMAND_CONFIGURE_DOORBELL 1
#define COMMAND_TEARDOWN_DOORBELL 2
#define COMMAND_CONFIGURE_MW 3
#define COMMAND_TEARDOWN_MW 4
#define COMMAND_LINK_UP 5
#define COMMAND_LINK_DOWN 6
#define COMMAND_STATUS_OK 1
#define COMMAND_STATUS_ERROR 2
#define LINK_STATUS_UP BIT(0)
#define SPAD_COUNT 64
#define DB_COUNT 4
#define NTB_MW_OFFSET 2
#define DB_COUNT_MASK GENMASK(15, 0)
#define MSIX_ENABLE BIT(16)
#define MAX_DB_COUNT 32
#define MAX_MW 4
enum epf_ntb_bar {
BAR_CONFIG,
BAR_DB,
BAR_MW0,
BAR_MW1,
BAR_MW2,
};
/*
* +--------------------------------------------------+ Base
* | |
* | |
* | |
* | Common Control Register |
* | |
* | |
* | |
* +-----------------------+--------------------------+ Base+spad_offset
* | | |
* | Peer Spad Space | Spad Space |
* | | 