diff options
Diffstat (limited to 'drivers/serial/8250_acpi.c')
| -rw-r--r-- | drivers/serial/8250_acpi.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/serial/8250_acpi.c b/drivers/serial/8250_acpi.c new file mode 100644 index 00000000000..6b9ead28851 --- /dev/null +++ b/drivers/serial/8250_acpi.c @@ -0,0 +1,171 @@ +/* + * 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"); |