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 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");