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linux-hardened/drivers/input/serio/ct82c710.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

262 lines
6.7 KiB
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/*
* $Id: ct82c710.c,v 1.11 2001/09/25 10:12:07 vojtech Exp $
*
* Copyright (c) 1999-2001 Vojtech Pavlik
*/
/*
* 82C710 C&T mouse port chip driver for Linux
*/
/*
* 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
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/serio.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <asm/io.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("82C710 C&T mouse port chip driver");
MODULE_LICENSE("GPL");
/*
* ct82c710 interface
*/
#define CT82C710_DEV_IDLE 0x01 /* Device Idle */
#define CT82C710_RX_FULL 0x02 /* Device Char received */
#define CT82C710_TX_IDLE 0x04 /* Device XMIT Idle */
#define CT82C710_RESET 0x08 /* Device Reset */
#define CT82C710_INTS_ON 0x10 /* Device Interrupt On */
#define CT82C710_ERROR_FLAG 0x20 /* Device Error */
#define CT82C710_CLEAR 0x40 /* Device Clear */
#define CT82C710_ENABLE 0x80 /* Device Enable */
#define CT82C710_IRQ 12
#define CT82C710_DATA ct82c710_iores.start
#define CT82C710_STATUS (ct82c710_iores.start + 1)
static struct serio *ct82c710_port;
static struct platform_device *ct82c710_device;
static struct resource ct82c710_iores;
/*
* Interrupt handler for the 82C710 mouse port. A character
* is waiting in the 82C710.
*/
static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id)
{
return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0);
}
/*
* Wait for device to send output char and flush any input char.
*/
static int ct82c170_wait(void)
{
int timeout = 60000;
while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE))
!= (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) {
if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA);
udelay(1);
timeout--;
}
return !timeout;
}
static void ct82c710_close(struct serio *serio)
{
if (ct82c170_wait())
printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");
outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS);
if (ct82c170_wait())
printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");
free_irq(CT82C710_IRQ, NULL);
}
static int ct82c710_open(struct serio *serio)
{
unsigned char status;
if (request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL))
return -1;
status = inb_p(CT82C710_STATUS);
status |= (CT82C710_ENABLE | CT82C710_RESET);
outb_p(status, CT82C710_STATUS);
status &= ~(CT82C710_RESET);
outb_p(status, CT82C710_STATUS);
status |= CT82C710_INTS_ON;
outb_p(status, CT82C710_STATUS); /* Enable interrupts */
while (ct82c170_wait()) {
printk(KERN_ERR "ct82c710: Device busy in open()\n");
status &= ~(CT82C710_ENABLE | CT82C710_INTS_ON);
outb_p(status, CT82C710_STATUS);
free_irq(CT82C710_IRQ, NULL);
return -1;
}
return 0;
}
/*
* Write to the 82C710 mouse device.
*/
static int ct82c710_write(struct serio *port, unsigned char c)
{
if (ct82c170_wait()) return -1;
outb_p(c, CT82C710_DATA);
return 0;
}
/*
* See if we can find a 82C710 device. Read mouse address.
*/
static int __init ct82c710_detect(void)
{
outb_p(0x55, 0x2fa); /* Any value except 9, ff or 36 */
outb_p(0xaa, 0x3fa); /* Inverse of 55 */
outb_p(0x36, 0x3fa); /* Address the chip */
outb_p(0xe4, 0x3fa); /* 390/4; 390 = config address */
outb_p(0x1b, 0x2fa); /* Inverse of e4 */
outb_p(0x0f, 0x390); /* Write index */
if (inb_p(0x391) != 0xe4) /* Config address found? */
return -ENODEV; /* No: no 82C710 here */
outb_p(0x0d, 0x390); /* Write index */
ct82c710_iores.start = inb_p(0x391) << 2; /* Get mouse I/O address */
ct82c710_iores.end = ct82c710_iores.start + 1;
ct82c710_iores.flags = IORESOURCE_IO;
outb_p(0x0f, 0x390);
outb_p(0x0f, 0x391); /* Close config mode */
return 0;
}
static int __devinit ct82c710_probe(struct platform_device *dev)
{
ct82c710_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
if (!ct82c710_port)
return -ENOMEM;
ct82c710_port->id.type = SERIO_8042;
ct82c710_port->dev.parent = &dev->dev;
ct82c710_port->open = ct82c710_open;
ct82c710_port->close = ct82c710_close;
ct82c710_port->write = ct82c710_write;
strlcpy(ct82c710_port->name, "C&T 82c710 mouse port",
sizeof(ct82c710_port->name));
snprintf(ct82c710_port->phys, sizeof(ct82c710_port->phys),
"isa%16llx/serio0", (unsigned long long)CT82C710_DATA);
serio_register_port(ct82c710_port);
return 0;
}
static int __devexit ct82c710_remove(struct platform_device *dev)
{
serio_unregister_port(ct82c710_port);
return 0;
}
static struct platform_driver ct82c710_driver = {
.driver = {
.name = "ct82c710",
.owner = THIS_MODULE,
},
.probe = ct82c710_probe,
.remove = __devexit_p(ct82c710_remove),
};
static int __init ct82c710_init(void)
{
int error;
error = ct82c710_detect();
if (error)
return error;
error = platform_driver_register(&ct82c710_driver);
if (error)
return error;
ct82c710_device = platform_device_alloc("ct82c710", -1);
if (!ct82c710_device) {
error = -ENOMEM;
goto err_unregister_driver;
}
error = platform_device_add_resources(ct82c710_device, &ct82c710_iores, 1);
if (error)
goto err_free_device;
error = platform_device_add(ct82c710_device);
if (error)
goto err_free_device;
serio_register_port(ct82c710_port);
printk(KERN_INFO "serio: C&T 82c710 mouse port at %#llx irq %d\n",
(unsigned long long)CT82C710_DATA, CT82C710_IRQ);
return 0;
err_free_device:
platform_device_put(ct82c710_device);
err_unregister_driver:
platform_driver_unregister(&ct82c710_driver);
return error;
}
static void __exit ct82c710_exit(void)
{
platform_device_unregister(ct82c710_device);
platform_driver_unregister(&ct82c710_driver);
}
module_init(ct82c710_init);
module_exit(ct82c710_exit);
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