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/*
* IBM ASM Service Processor Device Driver
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) IBM Corporation, 2004
*
* Author: Max Asböck <amax@us.ibm.com>
*
* This driver is based on code originally written by Pete Reynolds
* and others.
*
*/
/*
* The ASM device driver does the following things:
*
* 1) When loaded it sends a message to the service processor,
* indicating that an OS is * running. This causes the service processor
* to send periodic heartbeats to the OS.
*
* 2) Answers the periodic heartbeats sent by the service processor.
* Failure to do so would result in system reboot.
*
* 3) Acts as a pass through for dot commands sent from user applications.
* The interface for this is the ibmasmfs file system.
*
* 4) Allows user applications to register for event notification. Events
* are sent to the driver through interrupts. They can be read from user
* space through the ibmasmfs file system.
*
* 5) Allows user space applications to send heartbeats to the service
* processor (aka reverse heartbeats). Again this happens through ibmasmfs.
*
* 6) Handles remote mouse and keyboard event interrupts and makes them
* available to user applications through ibmasmfs.
*
*/
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/slab.h>
#include "ibmasm.h"
#include "lowlevel.h"
#include "remote.h"
int ibmasm_debug = 0;
module_param(ibmasm_debug, int , S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(ibmasm_debug, " Set debug mode on or off");
static int __devinit ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
int result;
struct service_processor *sp;
if ((result = pci_enable_device(pdev))) {
dev_err(&pdev->dev, "Failed to enable PCI device\n");
return result;
}
if ((result = pci_request_regions(pdev, DRIVER_NAME))) {
dev_err(&pdev->dev, "Failed to allocate PCI resources\n");
goto error_resources;
}
/* vnc client won't work without bus-mastering */
pci_set_master(pdev);
sp = kzalloc(sizeof(struct service_processor), GFP_KERNEL);
if (sp == NULL) {
dev_err(&pdev->dev, "Failed to allocate memory\n");
result = -ENOMEM;
goto error_kmalloc;
}
spin_lock_init(&sp->lock);
INIT_LIST_HEAD(&sp->command_queue);
pci_set_drvdata(pdev, (void *)sp);
sp->dev = &pdev->dev;
sp->number = pdev->bus->number;
snprintf(sp->dirname, IBMASM_NAME_SIZE, "%d", sp->number);
snprintf(sp->devname, IBMASM_NAME_SIZE, "%s%d", DRIVER_NAME, sp->number);
if (ibmasm_event_buffer_init(sp)) {
dev_err(sp->dev, "Failed to allocate event buffer\n");
goto error_eventbuffer;
}
if (ibmasm_heartbeat_init(sp)) {
dev_err(sp->dev, "Failed to allocate heartbeat command\n");
goto error_heartbeat;
}
sp->irq = pdev->irq;
sp->base_address = pci_ioremap_bar(pdev, 0);
if (!sp->base_address) {
dev_err(sp->dev, "Failed to ioremap pci memory\n");
result = -ENODEV;
goto error_ioremap;
}
result = request_irq(sp->irq, ibmasm_interrupt_handler, IRQF_SHARED, sp->devname, (void*)sp);
if (result) {
dev_err(sp->dev, "Failed to register interrupt handler\n");
goto error_request_irq;
}
enable_sp_interrupts(sp->base_address);
result = ibmasm_init_remote_input_dev(sp);
if (result) {
dev_err(sp->dev, "Failed to initialize remote queue\n");
goto error_send_message;
}
result = ibmasm_send_driver_vpd(sp);
if (result) {
dev_err(sp->dev, "Failed to send driver VPD to service processor\n");
goto error_send_message;
}
result = ibmasm_send_os_state(sp, SYSTEM_STATE_OS_UP);
if (result) {
dev_err(sp->dev, "Failed to send OS state to service processor\n");
goto error_send_message;
}
ibmasmfs_add_sp(sp);
ibmasm_register_uart(sp);
return 0;
error_send_message:
disable_sp_interrupts(sp->base_address);
ibmasm_free_remote_input_dev(sp);
free_irq(sp->irq, (void *)sp);
error_request_irq:
iounmap(sp->base_address);
error_ioremap:
ibmasm_heartbeat_exit(sp);
error_heartbeat:
ibmasm_event_buffer_exit(sp);
error_eventbuffer:
pci_set_drvdata(pdev, NULL);
kfree(sp);
error_kmalloc:
pci_release_regions(pdev);
error_resources:
pci_disable_device(pdev);
return result;
}
static void __devexit ibmasm_remove_one(struct pci_dev *pdev)
{
struct service_processor *sp = (struct service_processor *)pci_get_drvdata(pdev);
dbg("Unregistering UART\n");
ibmasm_unregister_uart(sp);
dbg("Sending OS down message\n");
if (ibmasm_send_os_state(sp, SYSTEM_STATE_OS_DOWN))
err("failed to get repsonse to 'Send OS State' command\n");
dbg("Disabling heartbeats\n");
ibmasm_heartbeat_exit(sp);
dbg("Disabling interrupts\n");
disable_sp_interrupts(sp->base_address);
dbg("Freeing SP irq\n");
free_irq(sp->irq, (void *)sp);
dbg("Cleaning up\n");
ibmasm_free_remote_input_dev(sp);
iounmap(sp->base_address);
ibmasm_event_buffer_exit(sp);
pci_set_drvdata(pdev, NULL);
kfree(sp);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
static struct pci_device_id ibmasm_pci_table[] =
{
{ PCI_DEVICE(VENDORID_IBM, DEVICEID_RSA) },
{},
};
static struct pci_driver ibmasm_driver = {
.name = DRIVER_NAME,
.id_table = ibmasm_pci_table,
.probe = ibmasm_init_one,
.remove = __devexit_p(ibmasm_remove_one),
};
static void __exit ibmasm_exit (void)
{
ibmasm_unregister_panic_notifier();
ibmasmfs_unregister();
pci_unregister_driver(&ibmasm_driver);
info(DRIVER_DESC " version " DRIVER_VERSION " unloaded");
}
static int __init ibmasm_init(void)
{
int result = pci_register_driver(&ibmasm_driver);
if (result)
return result;
result = ibmasmfs_register();
if (result) {
pci_unregister_driver(&ibmasm_driver);
err("Failed to register ibmasmfs file system");
return result;
}
ibmasm_register_panic_notifier();
info(DRIVER_DESC " version " DRIVER_VERSION " loaded");
return 0;
}
module_init(ibmasm_init);
module_exit(ibmasm_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ibmasm_pci_table);
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