/* * 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->min_address_range; 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->range_length) { port->iobase = io->min_base_address; 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_ext_irq *ext_irq) { if (ext_irq->number_of_interrupts > 0) port->irq = acpi_register_gsi(ext_irq->interrupts[0], ext_irq->edge_level, ext_irq->active_high_low); return AE_OK; } static acpi_status acpi_serial_irq(struct uart_port *port, struct acpi_resource_irq *irq) { if (irq->number_of_interrupts > 0) port->irq = acpi_register_gsi(irq->interrupts[0], irq->edge_level, irq->active_high_low); 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->id == ACPI_RSTYPE_IO) return acpi_serial_port(port, &res->data.io); else if (res->id == ACPI_RSTYPE_EXT_IRQ) return acpi_serial_ext_irq(port, &res->data.extended_irq); else if (res->id == ACPI_RSTYPE_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");