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