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
serial_8250_warn_need_ioport(struct pci_dev * dev)15 int 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 }
22 EXPORT_SYMBOL_NS_GPL(serial_8250_warn_need_ioport, "SERIAL_8250_PCI");
23
serial8250_pci_setup_port(struct pci_dev * dev,struct uart_8250_port * port,u8 bar,unsigned int offset,int regshift,void __iomem * iomem)24 int serial8250_pci_setup_port(struct pci_dev *dev, struct uart_8250_port *port,
25 u8 bar, unsigned int offset, int regshift, void __iomem *iomem)
26 {
27 if (bar >= PCI_STD_NUM_BARS)
28 return -EINVAL;
29
30 if (pci_resource_flags(dev, bar) & IORESOURCE_MEM) {
31 port->port.iotype = UPIO_MEM;
32 port->port.iobase = 0;
33 port->port.mapbase = pci_resource_start(dev, bar) + offset;
34 port->port.membase = iomem + offset;
35 port->port.regshift = regshift;
36 } else if (IS_ENABLED(CONFIG_HAS_IOPORT)) {
37 port->port.iotype = UPIO_PORT;
38 port->port.iobase = pci_resource_start(dev, bar) + offset;
39 port->port.mapbase = 0;
40 port->port.membase = NULL;
41 port->port.regshift = 0;
42 } else {
43 return serial_8250_warn_need_ioport(dev);
44 }
45 return 0;
46 }
47 EXPORT_SYMBOL_NS_GPL(serial8250_pci_setup_port, "SERIAL_8250_PCI");
48 MODULE_DESCRIPTION("8250 PCI library");
49 MODULE_LICENSE("GPL");
50