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7d12e780e0
linux/drivers/isdn/sc/init.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

558 lines
13 KiB
C
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/*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include "includes.h"
#include "hardware.h"
#include "card.h"
MODULE_DESCRIPTION("ISDN4Linux: Driver for Spellcaster card");
MODULE_AUTHOR("Spellcaster Telecommunications Inc.");
MODULE_LICENSE("GPL");
board *sc_adapter[MAX_CARDS];
int cinst;
static char devname[] = "scX";
static const char version[] = "2.0b1";
static const char *boardname[] = { "DataCommute/BRI", "DataCommute/PRI", "TeleCommute/BRI" };
/* insmod set parameters */
static unsigned int io[] = {0,0,0,0};
static unsigned char irq[] = {0,0,0,0};
static unsigned long ram[] = {0,0,0,0};
static int do_reset = 0;
module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
module_param_array(ram, int, NULL, 0);
module_param(do_reset, bool, 0);
extern irqreturn_t interrupt_handler(int, void *);
extern int sndpkt(int, int, int, struct sk_buff *);
extern int command(isdn_ctrl *);
extern int indicate_status(int, int, ulong, char*);
extern int reset(int);
static int identify_board(unsigned long, unsigned int);
static int __init sc_init(void)
{
int b = -1;
int i, j;
int status = -ENODEV;
unsigned long memsize = 0;
unsigned long features = 0;
isdn_if *interface;
unsigned char channels;
unsigned char pgport;
unsigned long magic;
int model;
int last_base = IOBASE_MIN;
int probe_exhasted = 0;
#ifdef MODULE
pr_info("SpellCaster ISA ISDN Adapter Driver rev. %s Loaded\n", version);
#else
pr_info("SpellCaster ISA ISDN Adapter Driver rev. %s\n", version);
#endif
pr_info("Copyright (C) 1996 SpellCaster Telecommunications Inc.\n");
while(b++ < MAX_CARDS - 1) {
pr_debug("Probing for adapter #%d\n", b);
/*
* Initialize reusable variables
*/
model = -1;
magic = 0;
channels = 0;
pgport = 0;
/*
* See if we should probe for IO base
*/
pr_debug("I/O Base for board %d is 0x%x, %s probe\n", b, io[b],
io[b] == 0 ? "will" : "won't");
if(io[b]) {
/*
* No, I/O Base has been provided
*/
for (i = 0 ; i < MAX_IO_REGS - 1 ; i++) {
if(!request_region(io[b] + i * 0x400, 1, "sc test")) {
pr_debug("request_region for 0x%x failed\n", io[b] + i * 0x400);
io[b] = 0;
break;
} else
release_region(io[b] + i * 0x400, 1);
}
/*
* Confirm the I/O Address with a test
*/
if(io[b] == 0) {
pr_debug("I/O Address 0x%x is in use.\n");
continue;
}
outb(0x18, io[b] + 0x400 * EXP_PAGE0);
if(inb(io[b] + 0x400 * EXP_PAGE0) != 0x18) {
pr_debug("I/O Base 0x%x fails test\n");
continue;
}
}
else {
/*
* Yes, probe for I/O Base
*/
if(probe_exhasted) {
pr_debug("All probe addresses exhasted, skipping\n");
continue;
}
pr_debug("Probing for I/O...\n");
for (i = last_base ; i <= IOBASE_MAX ; i += IOBASE_OFFSET) {
int found_io = 1;
if (i == IOBASE_MAX) {
probe_exhasted = 1; /* No more addresses to probe */
pr_debug("End of Probes\n");
}
last_base = i + IOBASE_OFFSET;
pr_debug(" checking 0x%x...", i);
for ( j = 0 ; j < MAX_IO_REGS - 1 ; j++) {
if(!request_region(i + j * 0x400, 1, "sc test")) {
pr_debug("Failed\n");
found_io = 0;
break;
} else
release_region(i + j * 0x400, 1);
}
if(found_io) {
io[b] = i;
outb(0x18, io[b] + 0x400 * EXP_PAGE0);
if(inb(io[b] + 0x400 * EXP_PAGE0) != 0x18) {
pr_debug("Failed by test\n");
continue;
}
pr_debug("Passed\n");
break;
}
}
if(probe_exhasted) {
continue;
}
}
/*
* See if we should probe for shared RAM
*/
if(do_reset) {
pr_debug("Doing a SAFE probe reset\n");
outb(0xFF, io[b] + RESET_OFFSET);
msleep_interruptible(10000);
}
pr_debug("RAM Base for board %d is 0x%x, %s probe\n", b, ram[b],
ram[b] == 0 ? "will" : "won't");
if(ram[b]) {
/*
* No, the RAM base has been provided
* Just look for a signature and ID the
* board model
*/
if(request_region(ram[b], SRAM_PAGESIZE, "sc test")) {
pr_debug("request_region for RAM base 0x%x succeeded\n", ram[b]);
model = identify_board(ram[b], io[b]);
release_region(ram[b], SRAM_PAGESIZE);
}
}
else {
/*
* Yes, probe for free RAM and look for
* a signature and id the board model
*/
for (i = SRAM_MIN ; i < SRAM_MAX ; i += SRAM_PAGESIZE) {
pr_debug("Checking RAM address 0x%x...\n", i);
if(request_region(i, SRAM_PAGESIZE, "sc test")) {
pr_debug(" request_region succeeded\n");
model = identify_board(i, io[b]);
release_region(i, SRAM_PAGESIZE);
if (model >= 0) {
pr_debug(" Identified a %s\n",
boardname[model]);
ram[b] = i;
break;
}
pr_debug(" Unidentifed or inaccessible\n");
continue;
}
pr_debug(" request failed\n");
}
}
/*
* See if we found free RAM and the board model
*/
if(!ram[b] || model < 0) {
/*
* Nope, there was no place in RAM for the
* board, or it couldn't be identified
*/
pr_debug("Failed to find an adapter at 0x%x\n", ram[b]);
continue;
}
/*
* Set the board's magic number, memory size and page register
*/
switch(model) {
case PRI_BOARD:
channels = 23;
magic = 0x20000;
memsize = 0x100000;
features = PRI_FEATURES;
break;
case BRI_BOARD:
case POTS_BOARD:
channels = 2;
magic = 0x60000;
memsize = 0x10000;
features = BRI_FEATURES;
break;
}
switch(ram[b] >> 12 & 0x0F) {
case 0x0:
pr_debug("RAM Page register set to EXP_PAGE0\n");
pgport = EXP_PAGE0;
break;
case 0x4:
pr_debug("RAM Page register set to EXP_PAGE1\n");
pgport = EXP_PAGE1;
break;
case 0x8:
pr_debug("RAM Page register set to EXP_PAGE2\n");
pgport = EXP_PAGE2;
break;
case 0xC:
pr_debug("RAM Page register set to EXP_PAGE3\n");
pgport = EXP_PAGE3;
break;
default:
pr_debug("RAM base address doesn't fall on 16K boundary\n");
continue;
}
pr_debug("current IRQ: %d b: %d\n",irq[b],b);
/*
* Make sure we got an IRQ
*/
if(!irq[b]) {
/*
* No interrupt could be used
*/
pr_debug("Failed to acquire an IRQ line\n");
continue;
}
/*
* Horray! We found a board, Make sure we can register
* it with ISDN4Linux
*/
interface = kmalloc(sizeof(isdn_if), GFP_KERNEL);
if (interface == NULL) {
/*
* Oops, can't malloc isdn_if
*/
continue;
}
memset(interface, 0, sizeof(isdn_if));
interface->owner = THIS_MODULE;
interface->hl_hdrlen = 0;
interface->channels = channels;
interface->maxbufsize = BUFFER_SIZE;
interface->features = features;
interface->writebuf_skb = sndpkt;
interface->writecmd = NULL;
interface->command = command;
strcpy(interface->id, devname);
interface->id[2] = '0' + cinst;
/*
* Allocate the board structure
*/
sc_adapter[cinst] = kmalloc(sizeof(board), GFP_KERNEL);
if (sc_adapter[cinst] == NULL) {
/*
* Oops, can't alloc memory for the board
*/
kfree(interface);
continue;
}
memset(sc_adapter[cinst], 0, sizeof(board));
spin_lock_init(&sc_adapter[cinst]->lock);
if(!register_isdn(interface)) {
/*
* Oops, couldn't register for some reason
*/
kfree(interface);
kfree(sc_adapter[cinst]);
continue;
}
sc_adapter[cinst]->card = interface;
sc_adapter[cinst]->driverId = interface->channels;
strcpy(sc_adapter[cinst]->devicename, interface->id);
sc_adapter[cinst]->nChannels = channels;
sc_adapter[cinst]->ramsize = memsize;
sc_adapter[cinst]->shmem_magic = magic;
sc_adapter[cinst]->shmem_pgport = pgport;
sc_adapter[cinst]->StartOnReset = 1;
/*
* Allocate channels status structures
*/
sc_adapter[cinst]->channel = kmalloc(sizeof(bchan) * channels, GFP_KERNEL);
if (sc_adapter[cinst]->channel == NULL) {
/*
* Oops, can't alloc memory for the channels
*/
indicate_status(cinst, ISDN_STAT_UNLOAD, 0, NULL); /* Fix me */
kfree(interface);
kfree(sc_adapter[cinst]);
continue;
}
memset(sc_adapter[cinst]->channel, 0, sizeof(bchan) * channels);
/*
* Lock down the hardware resources
*/
sc_adapter[cinst]->interrupt = irq[b];
if (request_irq(sc_adapter[cinst]->interrupt, interrupt_handler,
IRQF_DISABLED, interface->id, NULL))
{
kfree(sc_adapter[cinst]->channel);
indicate_status(cinst, ISDN_STAT_UNLOAD, 0, NULL); /* Fix me */
kfree(interface);
kfree(sc_adapter[cinst]);
continue;
}
sc_adapter[cinst]->iobase = io[b];
for(i = 0 ; i < MAX_IO_REGS - 1 ; i++) {
sc_adapter[cinst]->ioport[i] = io[b] + i * 0x400;
request_region(sc_adapter[cinst]->ioport[i], 1,
interface->id);
pr_debug("Requesting I/O Port %#x\n",
sc_adapter[cinst]->ioport[i]);
}
sc_adapter[cinst]->ioport[IRQ_SELECT] = io[b] + 0x2;
request_region(sc_adapter[cinst]->ioport[IRQ_SELECT], 1,
interface->id);
pr_debug("Requesting I/O Port %#x\n",
sc_adapter[cinst]->ioport[IRQ_SELECT]);
sc_adapter[cinst]->rambase = ram[b];
request_region(sc_adapter[cinst]->rambase, SRAM_PAGESIZE,
interface->id);
pr_info(" %s (%d) - %s %d channels IRQ %d, I/O Base 0x%x, RAM Base 0x%lx\n",
sc_adapter[cinst]->devicename,
sc_adapter[cinst]->driverId,
boardname[model], channels, irq[b], io[b], ram[b]);
/*
* reset the adapter to put things in motion
*/
reset(cinst);
cinst++;
status = 0;
}
if (status)
pr_info("Failed to find any adapters, driver unloaded\n");
return status;
}
static void __exit sc_exit(void)
{
int i, j;
for(i = 0 ; i < cinst ; i++) {
pr_debug("Cleaning up after adapter %d\n", i);
/*
* kill the timers
*/
del_timer(&(sc_adapter[i]->reset_timer));
del_timer(&(sc_adapter[i]->stat_timer));
/*
* Tell I4L we're toast
*/
indicate_status(i, ISDN_STAT_STOP, 0, NULL);
indicate_status(i, ISDN_STAT_UNLOAD, 0, NULL);
/*
* Release shared RAM
*/
release_region(sc_adapter[i]->rambase, SRAM_PAGESIZE);
/*
* Release the IRQ
*/
FREE_IRQ(sc_adapter[i]->interrupt, NULL);
/*
* Reset for a clean start
*/
outb(0xFF, sc_adapter[i]->ioport[SFT_RESET]);
/*
* Release the I/O Port regions
*/
for(j = 0 ; j < MAX_IO_REGS - 1; j++) {
release_region(sc_adapter[i]->ioport[j], 1);
pr_debug("Releasing I/O Port %#x\n",
sc_adapter[i]->ioport[j]);
}
release_region(sc_adapter[i]->ioport[IRQ_SELECT], 1);
pr_debug("Releasing I/O Port %#x\n",
sc_adapter[i]->ioport[IRQ_SELECT]);
/*
* Release any memory we alloced
*/
kfree(sc_adapter[i]->channel);
kfree(sc_adapter[i]->card);
kfree(sc_adapter[i]);
}
pr_info("SpellCaster ISA ISDN Adapter Driver Unloaded.\n");
}
static int identify_board(unsigned long rambase, unsigned int iobase)
{
unsigned int pgport;
unsigned long sig;
DualPortMemory *dpm;
RspMessage rcvmsg;
ReqMessage sndmsg;
HWConfig_pl hwci;
int x;
pr_debug("Attempting to identify adapter @ 0x%x io 0x%x\n",
rambase, iobase);
/*
* Enable the base pointer
*/
outb(rambase >> 12, iobase + 0x2c00);
switch(rambase >> 12 & 0x0F) {
case 0x0:
pgport = iobase + PG0_OFFSET;
pr_debug("Page Register offset is 0x%x\n", PG0_OFFSET);
break;
case 0x4:
pgport = iobase + PG1_OFFSET;
pr_debug("Page Register offset is 0x%x\n", PG1_OFFSET);
break;
case 0x8:
pgport = iobase + PG2_OFFSET;
pr_debug("Page Register offset is 0x%x\n", PG2_OFFSET);
break;
case 0xC:
pgport = iobase + PG3_OFFSET;
pr_debug("Page Register offset is 0x%x\n", PG3_OFFSET);
break;
default:
pr_debug("Invalid rambase 0x%lx\n", rambase);
return -1;
}
/*
* Try to identify a PRI card
*/
outb(PRI_BASEPG_VAL, pgport);
msleep_interruptible(1000);
sig = readl(rambase + SIG_OFFSET);
pr_debug("Looking for a signature, got 0x%x\n", sig);
if(sig == SIGNATURE)
return PRI_BOARD;
/*
* Try to identify a PRI card
*/
outb(BRI_BASEPG_VAL, pgport);
msleep_interruptible(1000);
sig = readl(rambase + SIG_OFFSET);
pr_debug("Looking for a signature, got 0x%x\n", sig);
if(sig == SIGNATURE)
return BRI_BOARD;
return -1;
/*
* Try to spot a card
*/
sig = readl(rambase + SIG_OFFSET);
pr_debug("Looking for a signature, got 0x%x\n", sig);
if(sig != SIGNATURE)
return -1;
dpm = (DualPortMemory *) rambase;
memset(&sndmsg, 0, MSG_LEN);
sndmsg.msg_byte_cnt = 3;
sndmsg.type = cmReqType1;
sndmsg.class = cmReqClass0;
sndmsg.code = cmReqHWConfig;
memcpy_toio(&(dpm->req_queue[dpm->req_head++]), &sndmsg, MSG_LEN);
outb(0, iobase + 0x400);
pr_debug("Sent HWConfig message\n");
/*
* Wait for the response
*/
x = 0;
while((inb(iobase + FIFOSTAT_OFFSET) & RF_HAS_DATA) && x < 100) {
schedule_timeout_interruptible(1);
x++;
}
if(x == 100) {
pr_debug("Timeout waiting for response\n");
return -1;
}
memcpy_fromio(&rcvmsg, &(dpm->rsp_queue[dpm->rsp_tail]), MSG_LEN);
pr_debug("Got HWConfig response, status = 0x%x\n", rcvmsg.rsp_status);
memcpy(&hwci, &(rcvmsg.msg_data.HWCresponse), sizeof(HWConfig_pl));
pr_debug("Hardware Config: Interface: %s, RAM Size: %d, Serial: %s\n"
" Part: %s, Rev: %s\n",
hwci.st_u_sense ? "S/T" : "U", hwci.ram_size,
hwci.serial_no, hwci.part_no, hwci.rev_no);
if(!strncmp(PRI_PARTNO, hwci.part_no, 6))
return PRI_BOARD;
if(!strncmp(BRI_PARTNO, hwci.part_no, 6))
return BRI_BOARD;
return -1;
}
module_init(sc_init);
module_exit(sc_exit);
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