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