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/*
* Copyright (c) 2002-2003 Matthew Wilcox for Hewlett-Packard
* Copyright (C) 2004 Hewlett-Packard Co
* Bjorn Helgaas <bjorn.helgaas@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/serial_core.h>
#include <acpi/acpi_bus.h>
#include <asm/io.h>
#include "8250.h"
struct serial_private {
int line;
};
static acpi_status acpi_serial_mmio(struct uart_port *port,
struct acpi_resource_address64 *addr)
{
port->mapbase = addr->minimum;
port->iotype = UPIO_MEM;
port->flags |= UPF_IOREMAP;
return AE_OK;
}
static acpi_status acpi_serial_port(struct uart_port *port,
struct acpi_resource_io *io)
{
if (io->address_length) {
port->iobase = io->minimum;
port->iotype = UPIO_PORT;
} else
printk(KERN_ERR "%s: zero-length IO port range?\n", __FUNCTION__);
return AE_OK;
}
static acpi_status acpi_serial_ext_irq(struct uart_port *port,
struct acpi_resource_extended_irq *ext_irq)
{
int rc;
if (ext_irq->interrupt_count > 0) {
rc = acpi_register_gsi(ext_irq->interrupts[0],
ext_irq->triggering, ext_irq->polarity);
if (rc < 0)
return AE_ERROR;
port->irq = rc;
}
return AE_OK;
}
static acpi_status acpi_serial_irq(struct uart_port *port,
struct acpi_resource_irq *irq)
{
int rc;
if (irq->interrupt_count > 0) {
rc = acpi_register_gsi(irq->interrupts[0],
irq->triggering, irq->polarity);
if (rc < 0)
return AE_ERROR;
port->irq = rc;
}
return AE_OK;
}
static acpi_status acpi_serial_resource(struct acpi_resource *res, void *data)
{
struct uart_port *port = (struct uart_port *) data;
struct acpi_resource_address64 addr;
acpi_status status;
status = acpi_resource_to_address64(res, &addr);
if (ACPI_SUCCESS(status))
return acpi_serial_mmio(port, &addr);
else if (res->type == ACPI_RESOURCE_TYPE_IO)
return acpi_serial_port(port, &res->data.io);
else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ)
return acpi_serial_ext_irq(port, &res->data.extended_irq);
else if (res->type == ACPI_RESOURCE_TYPE_IRQ)
return acpi_serial_irq(port, &res->data.irq);
return AE_OK;
}
static int acpi_serial_add(struct acpi_device *device)
{
struct serial_private *priv;
acpi_status status;
struct uart_port port;
int result;
memset(&port, 0, sizeof(struct uart_port));
port.uartclk = 1843200;
port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
priv = kmalloc(sizeof(struct serial_private), GFP_KERNEL);
if (!priv) {
result = -ENOMEM;
goto fail;
}
memset(priv, 0, sizeof(*priv));
status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
acpi_serial_resource, &port);
if (ACPI_FAILURE(status)) {
result = -ENODEV;
goto fail;
}
if (!port.mapbase && !port.iobase) {
printk(KERN_ERR "%s: no iomem or port address in %s _CRS\n",
__FUNCTION__, device->pnp.bus_id);
result = -ENODEV;
goto fail;
}
priv->line = serial8250_register_port(&port);
if (priv->line < 0) {
printk(KERN_WARNING "Couldn't register serial port %s: %d\n",
device->pnp.bus_id, priv->line);
result = -ENODEV;
goto fail;
}
acpi_driver_data(device) = priv;
return 0;
fail:
kfree(priv);
return result;
}
static int acpi_serial_remove(struct acpi_device *device, int type)
{
struct serial_private *priv;
if (!device || !acpi_driver_data(device))
return -EINVAL;
priv = acpi_driver_data(device);
serial8250_unregister_port(priv->line);
kfree(priv);
return 0;
}
static struct acpi_driver acpi_serial_driver = {
.name = "serial",
.class = "",
.ids = "PNP0501",
.ops = {
.add = acpi_serial_add,
.remove = acpi_serial_remove,
},
};
static int __init acpi_serial_init(void)
{
return acpi_bus_register_driver(&acpi_serial_driver);
}
static void __exit acpi_serial_exit(void)
{
acpi_bus_unregister_driver(&acpi_serial_driver);
}
module_init(acpi_serial_init);
module_exit(acpi_serial_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic 8250/16x50 ACPI serial driver");
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