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// SPDX-License-Identifier: GPL-2.0
/*
* 8250 PCI library.
*
* Copyright (C) 2001 Russell King, All Rights Reserved.
*/
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/types.h>
#include "8250.h"
#include "8250_pcilib.h"
int serial_8250_warn_need_ioport(struct pci_dev *dev)
{
dev_warn(&dev->dev,
"Serial port not supported because of missing I/O resource\n");
return -ENXIO;
}
EXPORT_SYMBOL_NS_GPL(serial_8250_warn_need_ioport, SERIAL_8250_PCI);
int serial8250_pci_setup_port(struct pci_dev *dev, struct uart_8250_port *port,
u8 bar, unsigned int offset, int regshift)
{
if (bar >= PCI_STD_NUM_BARS)
return -EINVAL;
if (pci_resource_flags(dev, bar) & IORESOURCE_MEM) {
if (!pcim_iomap(dev, bar, 0) && !pcim_iomap_table(dev))
return -ENOMEM;
port->port.iotype = UPIO_MEM;
port->port.iobase = 0;
port->port.mapbase = pci_resource_start(dev, bar) + offset;
port->port.membase = pcim_iomap_table(dev)[bar] + offset;
port->port.regshift = regshift;
} else if (IS_ENABLED(CONFIG_HAS_IOPORT)) {
port->port.iotype = UPIO_PORT;
port->port.iobase = pci_resource_start(dev, bar) + offset;
port->port.mapbase = 0;
port->port.membase = NULL;
port->port.regshift = 0;
} else {
return serial_8250_warn_need_ioport(dev);
}
return 0;
}
EXPORT_SYMBOL_NS_GPL(serial8250_pci_setup_port, SERIAL_8250_PCI);
MODULE_DESCRIPTION("8250 PCI library");
MODULE_LICENSE("GPL");
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