xref: /linux/drivers/tty/serial/8250/8250_pcilib.c (revision 9208c05f9fdfd927ea160b97dfef3c379049fff2)
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 
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 
24 int 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(dev, bar, 0) && !pcim_iomap_table(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(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 }
50 EXPORT_SYMBOL_NS_GPL(serial8250_pci_setup_port, SERIAL_8250_PCI);
51 MODULE_DESCRIPTION("8250 PCI library");
52 MODULE_LICENSE("GPL");
53