drivers/tty/serial/8250/8250_pcilib.c

   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 serial8250_pci_setup_port(struct pci_dev *dev, struct uart_8250_port *port,
  16                    u8 bar, unsigned int offset, int regshift)
  17 {
  18         if (bar >= PCI_STD_NUM_BARS)
  19                 return -EINVAL;
  20
  21         if (pci_resource_flags(dev, bar) & IORESOURCE_MEM) {
  22                 if (!pcim_iomap(dev, bar, 0) && !pcim_iomap_table(dev))
  23                         return -ENOMEM;
  24
  25                 port->port.iotype = UPIO_MEM;
  26                 port->port.iobase = 0;
  27                 port->port.mapbase = pci_resource_start(dev, bar) + offset;
  28                 port->port.membase = pcim_iomap_table(dev)[bar] + offset;
  29                 port->port.regshift = regshift;
  30         } else {
  31                 port->port.iotype = UPIO_PORT;
  32                 port->port.iobase = pci_resource_start(dev, bar) + offset;
  33                 port->port.mapbase = 0;
  34                 port->port.membase = NULL;
  35                 port->port.regshift = 0;
  36         }
  37         return 0;
  38 }
  39 EXPORT_SYMBOL_NS_GPL(serial8250_pci_setup_port, SERIAL_8250_PCI);
  40 MODULE_LICENSE("GPL");