// SPDX-License-Identifier: GPL-2.0-only
/*
* Mediated virtual PCI serial host device driver
*
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
* Author: Neo Jia <cjia@nvidia.com>
* Kirti Wankhede <kwankhede@nvidia.com>
*
* Sample driver that creates mdev device that simulates serial port over PCI
* card.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/cdev.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/uuid.h>
#include <linux/vfio.h>
#include <linux/iommu.h>
#include <linux/sysfs.h>
#include <linux/ctype.h>
#include <linux/file.h>
#include <linux/mdev.h>
#include <linux/pci.h>
#include <linux/serial.h>
#include <uapi/linux/serial_reg.h>
#include <linux/eventfd.h>
/*
* #defines
*/
#define VERSION_STRING "0.1"
#define DRIVER_AUTHOR "NVIDIA Corporation"
#define MTTY_CLASS_NAME "mtty"
#define MTTY_NAME "mtty"
#define MTTY_STRING_LEN 16
#define MTTY_CONFIG_SPACE_SIZE 0xff
#define MTTY_IO_BAR_SIZE 0x8
#define MTTY_MMIO_BAR_SIZE 0x100000
#define STORE_LE16(addr, val) (*(u16 *)addr = val)
#define STORE_LE32(addr, val) (*(u32 *)addr = val)
#define MAX_FIFO_SIZE 16
#define CIRCULAR_BUF_INC_IDX(idx) (idx = (idx + 1) & (MAX_FIFO_SIZE - 1))
#define MTTY_VFIO_PCI_OFFSET_SHIFT 40
#define MTTY_VFIO_PCI_OFFSET_TO_INDEX(off) (off >> MTTY_VFIO_PCI_OFFSET_SHIFT)
#define MTTY_VFIO_PCI_INDEX_TO_OFFSET(index) \
((u64)(index) << MTTY_VFIO_PCI_OFFSET_SHIFT)
#define MTTY_VFIO_PCI_OFFSET_MASK \
(((u64)(1) << MTTY_VFIO_PCI_OFFSET_SHIFT) - 1)
#define MAX_MTTYS 24
/*
* Global Structures
*/
static struct mtty_dev {
dev_t vd_devt;
struct class *vd_class;
struct cdev vd_cdev;
struct idr vd_idr;
struct device dev;
} mtty_dev;
struct mdev_region_info {
u64 start;
u64 phys_start;
u32 size;
u64 vfio_offset;
};
#if defined(DEBUG_REGS)
static const char *wr_reg[] = {
"TX",
"IER",
"FCR",
"LCR",
"MCR",
"LSR",
"MSR",
"SCR"
};
static const char *rd_reg[] = {
"RX",
"IER",
"IIR",
"LCR",
"MCR",
"LSR",
"MSR",
"SCR"
};
#endif
/* loop back buffer */
struct rxtx {
u8 fifo[MAX_FIFO_SIZE];
u8 head, tail;
u8 count;
};
struct serial_port {
u8 uart_reg[8]; /* 8 registers */
struct rxtx rxtx; /* loop back buffer */
bool</