1// SPDX-License-Identifier: GPL-2.0
2/*
3 * 8250 PCI library.
4 *
5 * Copyright (C) 2001 Russell King, All Rights Reserved.
6 */
7#include <linux/errno.h>
8#include <linux/ioport.h>
9#include <linux/pci.h>
10#include <linux/types.h>
11
12#include "8250.h"
13#include "8250_pcilib.h"
14
15int serial_8250_warn_need_ioport(struct pci_dev *dev)
16{
17 dev_warn(&dev->dev,
18 "Serial port not supported because of missing I/O resource\n");
19
20 return -ENXIO;
21}
22EXPORT_SYMBOL_NS_GPL(serial_8250_warn_need_ioport, "SERIAL_8250_PCI");
23
24int serial8250_pci_setup_port(struct pci_dev *dev, struct uart_8250_port *port,
25 u8 bar, unsigned int offset, int regshift)
26{
27 if (bar >= PCI_STD_NUM_BARS)
28 return -EINVAL;
29
30 if (pci_resource_flags(dev, bar) & IORESOURCE_MEM) {
31 if (!pcim_iomap(pdev: dev, bar, maxlen: 0) && !pcim_iomap_table(pdev: dev))
32 return -ENOMEM;
33
34 port->port.iotype = UPIO_MEM;
35 port->port.iobase = 0;
36 port->port.mapbase = pci_resource_start(dev, bar) + offset;
37 port->port.membase = pcim_iomap_table(pdev: dev)[bar] + offset;
38 port->port.regshift = regshift;
39 } else if (IS_ENABLED(CONFIG_HAS_IOPORT)) {
40 port->port.iotype = UPIO_PORT;
41 port->port.iobase = pci_resource_start(dev, bar) + offset;
42 port->port.mapbase = 0;
43 port->port.membase = NULL;
44 port->port.regshift = 0;
45 } else {
46 return serial_8250_warn_need_ioport(dev);
47 }
48 return 0;
49}
50EXPORT_SYMBOL_NS_GPL(serial8250_pci_setup_port, "SERIAL_8250_PCI");
51MODULE_DESCRIPTION("8250 PCI library");
52MODULE_LICENSE("GPL");
53