![Bob Moore](/assets/img/avatar_default.png)
Completed a major overhaul of the Resource Manager code - specifically, optimizations in the area of the AML/internal resource conversion code. The code has been optimized to simplify and eliminate duplicated code, CPU stack use has been decreased by optimizing function parameters and local variables, and naming conventions across the manager have been standardized for clarity and ease of maintenance (this includes function, parameter, variable, and struct/typedef names.) All Resource Manager dispatch and information tables have been moved to a single location for clarity and ease of maintenance. One new file was created, named "rsinfo.c". The ACPI return macros (return_ACPI_STATUS, etc.) have been modified to guarantee that the argument is not evaluated twice, making them less prone to macro side-effects. However, since there exists the possibility of additional stack use if a particular compiler cannot optimize them (such as in the debug generation case), the original macros are optionally available. Note that some invocations of the return_VALUE macro may now cause size mismatch warnings; the return_UINT8 and return_UINT32 macros are provided to eliminate these. (From Randy Dunlap) Implemented a new mechanism to enable debug tracing for individual control methods. A new external interface, acpi_debug_trace(), is provided to enable this mechanism. The intent is to allow the host OS to easily enable and disable tracing for problematic control methods. This interface can be easily exposed to a user or debugger interface if desired. See the file psxface.c for details. acpi_ut_callocate() will now return a valid pointer if a length of zero is specified - a length of one is used and a warning is issued. This matches the behavior of acpi_ut_allocate(). Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
184 lines
4.2 KiB
C
184 lines
4.2 KiB
C
/*
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* Copyright (c) 2002-2003 Matthew Wilcox for Hewlett-Packard
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* Copyright (C) 2004 Hewlett-Packard Co
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/acpi.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/serial_core.h>
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#include <acpi/acpi_bus.h>
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#include <asm/io.h>
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#include "8250.h"
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struct serial_private {
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int line;
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};
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static acpi_status acpi_serial_mmio(struct uart_port *port,
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struct acpi_resource_address64 *addr)
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{
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port->mapbase = addr->minimum;
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port->iotype = UPIO_MEM;
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port->flags |= UPF_IOREMAP;
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return AE_OK;
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}
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static acpi_status acpi_serial_port(struct uart_port *port,
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struct acpi_resource_io *io)
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{
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if (io->address_length) {
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port->iobase = io->minimum;
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port->iotype = UPIO_PORT;
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} else
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printk(KERN_ERR "%s: zero-length IO port range?\n", __FUNCTION__);
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return AE_OK;
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}
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static acpi_status acpi_serial_ext_irq(struct uart_port *port,
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struct acpi_resource_extended_irq *ext_irq)
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{
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int rc;
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if (ext_irq->interrupt_count > 0) {
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rc = acpi_register_gsi(ext_irq->interrupts[0],
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ext_irq->triggering, ext_irq->polarity);
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if (rc < 0)
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return AE_ERROR;
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port->irq = rc;
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}
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return AE_OK;
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}
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static acpi_status acpi_serial_irq(struct uart_port *port,
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struct acpi_resource_irq *irq)
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{
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int rc;
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if (irq->interrupt_count > 0) {
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rc = acpi_register_gsi(irq->interrupts[0],
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irq->triggering, irq->polarity);
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if (rc < 0)
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return AE_ERROR;
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port->irq = rc;
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}
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return AE_OK;
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}
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static acpi_status acpi_serial_resource(struct acpi_resource *res, void *data)
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{
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struct uart_port *port = (struct uart_port *) data;
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struct acpi_resource_address64 addr;
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acpi_status status;
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status = acpi_resource_to_address64(res, &addr);
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if (ACPI_SUCCESS(status))
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return acpi_serial_mmio(port, &addr);
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else if (res->type == ACPI_RESOURCE_TYPE_IO)
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return acpi_serial_port(port, &res->data.io);
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else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ)
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return acpi_serial_ext_irq(port, &res->data.extended_irq);
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else if (res->type == ACPI_RESOURCE_TYPE_IRQ)
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return acpi_serial_irq(port, &res->data.irq);
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return AE_OK;
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}
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static int acpi_serial_add(struct acpi_device *device)
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{
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struct serial_private *priv;
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acpi_status status;
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struct uart_port port;
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int result;
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memset(&port, 0, sizeof(struct uart_port));
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port.uartclk = 1843200;
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port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
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priv = kmalloc(sizeof(struct serial_private), GFP_KERNEL);
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if (!priv) {
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result = -ENOMEM;
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goto fail;
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}
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memset(priv, 0, sizeof(*priv));
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status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
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acpi_serial_resource, &port);
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if (ACPI_FAILURE(status)) {
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result = -ENODEV;
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goto fail;
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}
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if (!port.mapbase && !port.iobase) {
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printk(KERN_ERR "%s: no iomem or port address in %s _CRS\n",
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__FUNCTION__, device->pnp.bus_id);
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result = -ENODEV;
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goto fail;
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}
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priv->line = serial8250_register_port(&port);
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if (priv->line < 0) {
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printk(KERN_WARNING "Couldn't register serial port %s: %d\n",
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device->pnp.bus_id, priv->line);
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result = -ENODEV;
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goto fail;
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}
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acpi_driver_data(device) = priv;
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return 0;
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fail:
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kfree(priv);
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return result;
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}
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static int acpi_serial_remove(struct acpi_device *device, int type)
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{
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struct serial_private *priv;
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if (!device || !acpi_driver_data(device))
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return -EINVAL;
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priv = acpi_driver_data(device);
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serial8250_unregister_port(priv->line);
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kfree(priv);
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return 0;
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}
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static struct acpi_driver acpi_serial_driver = {
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.name = "serial",
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.class = "",
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.ids = "PNP0501",
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.ops = {
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.add = acpi_serial_add,
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.remove = acpi_serial_remove,
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},
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};
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static int __init acpi_serial_init(void)
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{
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return acpi_bus_register_driver(&acpi_serial_driver);
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}
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static void __exit acpi_serial_exit(void)
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{
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acpi_bus_unregister_driver(&acpi_serial_driver);
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}
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module_init(acpi_serial_init);
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module_exit(acpi_serial_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Generic 8250/16x50 ACPI serial driver");
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