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linux/drivers/isdn/hisax/bkm_a8.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

451 lines
12 KiB
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/* $Id: bkm_a8.c,v 1.22.2.4 2004/01/15 14:02:34 keil Exp $
*
* low level stuff for Scitel Quadro (4*S0, passive)
*
* Author Roland Klabunde
* Copyright by Roland Klabunde <R.Klabunde@Berkom.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
*/
#include <linux/init.h>
#include "hisax.h"
#include "isac.h"
#include "ipac.h"
#include "hscx.h"
#include "isdnl1.h"
#include <linux/pci.h>
#include "bkm_ax.h"
#ifdef CONFIG_PCI
#define ATTEMPT_PCI_REMAPPING /* Required for PLX rev 1 */
extern const char *CardType[];
static const char sct_quadro_revision[] = "$Revision: 1.22.2.4 $";
static const char *sct_quadro_subtypes[] =
{
"",
"#1",
"#2",
"#3",
"#4"
};
#define wordout(addr,val) outw(val,addr)
#define wordin(addr) inw(addr)
static inline u_char
readreg(unsigned int ale, unsigned int adr, u_char off)
{
register u_char ret;
wordout(ale, off);
ret = wordin(adr) & 0xFF;
return (ret);
}
static inline void
readfifo(unsigned int ale, unsigned int adr, u_char off, u_char * data, int size)
{
int i;
wordout(ale, off);
for (i = 0; i < size; i++)
data[i] = wordin(adr) & 0xFF;
}
static inline void
writereg(unsigned int ale, unsigned int adr, u_char off, u_char data)
{
wordout(ale, off);
wordout(adr, data);
}
static inline void
writefifo(unsigned int ale, unsigned int adr, u_char off, u_char * data, int size)
{
int i;
wordout(ale, off);
for (i = 0; i < size; i++)
wordout(adr, data[i]);
}
/* Interface functions */
static u_char
ReadISAC(struct IsdnCardState *cs, u_char offset)
{
return (readreg(cs->hw.ax.base, cs->hw.ax.data_adr, offset | 0x80));
}
static void
WriteISAC(struct IsdnCardState *cs, u_char offset, u_char value)
{
writereg(cs->hw.ax.base, cs->hw.ax.data_adr, offset | 0x80, value);
}
static void
ReadISACfifo(struct IsdnCardState *cs, u_char * data, int size)
{
readfifo(cs->hw.ax.base, cs->hw.ax.data_adr, 0x80, data, size);
}
static void
WriteISACfifo(struct IsdnCardState *cs, u_char * data, int size)
{
writefifo(cs->hw.ax.base, cs->hw.ax.data_adr, 0x80, data, size);
}
static u_char
ReadHSCX(struct IsdnCardState *cs, int hscx, u_char offset)
{
return (readreg(cs->hw.ax.base, cs->hw.ax.data_adr, offset + (hscx ? 0x40 : 0)));
}
static void
WriteHSCX(struct IsdnCardState *cs, int hscx, u_char offset, u_char value)
{
writereg(cs->hw.ax.base, cs->hw.ax.data_adr, offset + (hscx ? 0x40 : 0), value);
}
/* Set the specific ipac to active */
static void
set_ipac_active(struct IsdnCardState *cs, u_int active)
{
/* set irq mask */
writereg(cs->hw.ax.base, cs->hw.ax.data_adr, IPAC_MASK,
active ? 0xc0 : 0xff);
}
/*
* fast interrupt HSCX stuff goes here
*/
#define READHSCX(cs, nr, reg) readreg(cs->hw.ax.base, \
cs->hw.ax.data_adr, reg + (nr ? 0x40 : 0))
#define WRITEHSCX(cs, nr, reg, data) writereg(cs->hw.ax.base, \
cs->hw.ax.data_adr, reg + (nr ? 0x40 : 0), data)
#define READHSCXFIFO(cs, nr, ptr, cnt) readfifo(cs->hw.ax.base, \
cs->hw.ax.data_adr, (nr ? 0x40 : 0), ptr, cnt)
#define WRITEHSCXFIFO(cs, nr, ptr, cnt) writefifo(cs->hw.ax.base, \
cs->hw.ax.data_adr, (nr ? 0x40 : 0), ptr, cnt)
#include "hscx_irq.c"
static irqreturn_t
bkm_interrupt_ipac(int intno, void *dev_id)
{
struct IsdnCardState *cs = dev_id;
u_char ista, val, icnt = 5;
u_long flags;
spin_lock_irqsave(&cs->lock, flags);
ista = readreg(cs->hw.ax.base, cs->hw.ax.data_adr, IPAC_ISTA);
if (!(ista & 0x3f)) { /* not this IPAC */
spin_unlock_irqrestore(&cs->lock, flags);
return IRQ_NONE;
}
Start_IPAC:
if (cs->debug & L1_DEB_IPAC)
debugl1(cs, "IPAC ISTA %02X", ista);
if (ista & 0x0f) {
val = readreg(cs->hw.ax.base, cs->hw.ax.data_adr, HSCX_ISTA + 0x40);
if (ista & 0x01)
val |= 0x01;
if (ista & 0x04)
val |= 0x02;
if (ista & 0x08)
val |= 0x04;
if (val) {
hscx_int_main(cs, val);
}
}
if (ista & 0x20) {
val = 0xfe & readreg(cs->hw.ax.base, cs->hw.ax.data_adr, ISAC_ISTA | 0x80);
if (val) {
isac_interrupt(cs, val);
}
}
if (ista & 0x10) {
val = 0x01;
isac_interrupt(cs, val);
}
ista = readreg(cs->hw.ax.base, cs->hw.ax.data_adr, IPAC_ISTA);
if ((ista & 0x3f) && icnt) {
icnt--;
goto Start_IPAC;
}
if (!icnt)
printk(KERN_WARNING "HiSax: %s (%s) IRQ LOOP\n",
CardType[cs->typ],
sct_quadro_subtypes[cs->subtyp]);
writereg(cs->hw.ax.base, cs->hw.ax.data_adr, IPAC_MASK, 0xFF);
writereg(cs->hw.ax.base, cs->hw.ax.data_adr, IPAC_MASK, 0xC0);
spin_unlock_irqrestore(&cs->lock, flags);
return IRQ_HANDLED;
}
static void
release_io_sct_quadro(struct IsdnCardState *cs)
{
release_region(cs->hw.ax.base & 0xffffffc0, 128);
if (cs->subtyp == SCT_1)
release_region(cs->hw.ax.plx_adr, 64);
}
static void
enable_bkm_int(struct IsdnCardState *cs, unsigned bEnable)
{
if (cs->typ == ISDN_CTYPE_SCT_QUADRO) {
if (bEnable)
wordout(cs->hw.ax.plx_adr + 0x4C, (wordin(cs->hw.ax.plx_adr + 0x4C) | 0x41));
else
wordout(cs->hw.ax.plx_adr + 0x4C, (wordin(cs->hw.ax.plx_adr + 0x4C) & ~0x41));
}
}
static void
reset_bkm(struct IsdnCardState *cs)
{
if (cs->subtyp == SCT_1) {
wordout(cs->hw.ax.plx_adr + 0x50, (wordin(cs->hw.ax.plx_adr + 0x50) & ~4));
mdelay(10);
/* Remove the soft reset */
wordout(cs->hw.ax.plx_adr + 0x50, (wordin(cs->hw.ax.plx_adr + 0x50) | 4));
mdelay(10);
}
}
static int
BKM_card_msg(struct IsdnCardState *cs, int mt, void *arg)
{
u_long flags;
switch (mt) {
case CARD_RESET:
spin_lock_irqsave(&cs->lock, flags);
/* Disable ints */
set_ipac_active(cs, 0);
enable_bkm_int(cs, 0);
reset_bkm(cs);
spin_unlock_irqrestore(&cs->lock, flags);
return (0);
case CARD_RELEASE:
/* Sanity */
spin_lock_irqsave(&cs->lock, flags);
set_ipac_active(cs, 0);
enable_bkm_int(cs, 0);
spin_unlock_irqrestore(&cs->lock, flags);
release_io_sct_quadro(cs);
return (0);
case CARD_INIT:
spin_lock_irqsave(&cs->lock, flags);
cs->debug |= L1_DEB_IPAC;
set_ipac_active(cs, 1);
inithscxisac(cs, 3);
/* Enable ints */
enable_bkm_int(cs, 1);
spin_unlock_irqrestore(&cs->lock, flags);
return (0);
case CARD_TEST:
return (0);
}
return (0);
}
static int __devinit
sct_alloc_io(u_int adr, u_int len)
{
if (!request_region(adr, len, "scitel")) {
printk(KERN_WARNING
"HiSax: Scitel port %#x-%#x already in use\n",
adr, adr + len);
return (1);
}
return(0);
}
static struct pci_dev *dev_a8 __devinitdata = NULL;
static u16 sub_vendor_id __devinitdata = 0;
static u16 sub_sys_id __devinitdata = 0;
static u_char pci_bus __devinitdata = 0;
static u_char pci_device_fn __devinitdata = 0;
static u_char pci_irq __devinitdata = 0;
#endif /* CONFIG_PCI */
int __devinit
setup_sct_quadro(struct IsdnCard *card)
{
#ifdef CONFIG_PCI
struct IsdnCardState *cs = card->cs;
char tmp[64];
u_char pci_rev_id;
u_int found = 0;
u_int pci_ioaddr1, pci_ioaddr2, pci_ioaddr3, pci_ioaddr4, pci_ioaddr5;
strcpy(tmp, sct_quadro_revision);
printk(KERN_INFO "HiSax: T-Berkom driver Rev. %s\n", HiSax_getrev(tmp));
if (cs->typ == ISDN_CTYPE_SCT_QUADRO) {
cs->subtyp = SCT_1; /* Preset */
} else
return (0);
/* Identify subtype by para[0] */
if (card->para[0] >= SCT_1 && card->para[0] <= SCT_4)
cs->subtyp = card->para[0];
else {
printk(KERN_WARNING "HiSax: %s: Invalid subcontroller in configuration, default to 1\n",
CardType[card->typ]);
return (0);
}
if ((cs->subtyp != SCT_1) && ((sub_sys_id != PCI_DEVICE_ID_BERKOM_SCITEL_QUADRO) ||
(sub_vendor_id != PCI_VENDOR_ID_BERKOM)))
return (0);
if (cs->subtyp == SCT_1) {
while ((dev_a8 = pci_find_device(PCI_VENDOR_ID_PLX,
PCI_DEVICE_ID_PLX_9050, dev_a8))) {
sub_vendor_id = dev_a8->subsystem_vendor;
sub_sys_id = dev_a8->subsystem_device;
if ((sub_sys_id == PCI_DEVICE_ID_BERKOM_SCITEL_QUADRO) &&
(sub_vendor_id == PCI_VENDOR_ID_BERKOM)) {
if (pci_enable_device(dev_a8))
return(0);
pci_ioaddr1 = pci_resource_start(dev_a8, 1);
pci_irq = dev_a8->irq;
pci_bus = dev_a8->bus->number;
pci_device_fn = dev_a8->devfn;
found = 1;
break;
}
}
if (!found) {
printk(KERN_WARNING "HiSax: %s (%s): Card not found\n",
CardType[card->typ],
sct_quadro_subtypes[cs->subtyp]);
return (0);
}
#ifdef ATTEMPT_PCI_REMAPPING
/* HACK: PLX revision 1 bug: PLX address bit 7 must not be set */
pci_read_config_byte(dev_a8, PCI_REVISION_ID, &pci_rev_id);
if ((pci_ioaddr1 & 0x80) && (pci_rev_id == 1)) {
printk(KERN_WARNING "HiSax: %s (%s): PLX rev 1, remapping required!\n",
CardType[card->typ],
sct_quadro_subtypes[cs->subtyp]);
/* Restart PCI negotiation */
pci_write_config_dword(dev_a8, PCI_BASE_ADDRESS_1, (u_int) - 1);
/* Move up by 0x80 byte */
pci_ioaddr1 += 0x80;
pci_ioaddr1 &= PCI_BASE_ADDRESS_IO_MASK;
pci_write_config_dword(dev_a8, PCI_BASE_ADDRESS_1, pci_ioaddr1);
dev_a8->resource[ 1].start = pci_ioaddr1;
}
#endif /* End HACK */
}
if (!pci_irq) { /* IRQ range check ?? */
printk(KERN_WARNING "HiSax: %s (%s): No IRQ\n",
CardType[card->typ],
sct_quadro_subtypes[cs->subtyp]);
return (0);
}
pci_read_config_dword(dev_a8, PCI_BASE_ADDRESS_1, &pci_ioaddr1);
pci_read_config_dword(dev_a8, PCI_BASE_ADDRESS_2, &pci_ioaddr2);
pci_read_config_dword(dev_a8, PCI_BASE_ADDRESS_3, &pci_ioaddr3);
pci_read_config_dword(dev_a8, PCI_BASE_ADDRESS_4, &pci_ioaddr4);
pci_read_config_dword(dev_a8, PCI_BASE_ADDRESS_5, &pci_ioaddr5);
if (!pci_ioaddr1 || !pci_ioaddr2 || !pci_ioaddr3 || !pci_ioaddr4 || !pci_ioaddr5) {
printk(KERN_WARNING "HiSax: %s (%s): No IO base address(es)\n",
CardType[card->typ],
sct_quadro_subtypes[cs->subtyp]);
return (0);
}
pci_ioaddr1 &= PCI_BASE_ADDRESS_IO_MASK;
pci_ioaddr2 &= PCI_BASE_ADDRESS_IO_MASK;
pci_ioaddr3 &= PCI_BASE_ADDRESS_IO_MASK;
pci_ioaddr4 &= PCI_BASE_ADDRESS_IO_MASK;
pci_ioaddr5 &= PCI_BASE_ADDRESS_IO_MASK;
/* Take over */
cs->irq = pci_irq;
cs->irq_flags |= IRQF_SHARED;
/* pci_ioaddr1 is unique to all subdevices */
/* pci_ioaddr2 is for the fourth subdevice only */
/* pci_ioaddr3 is for the third subdevice only */
/* pci_ioaddr4 is for the second subdevice only */
/* pci_ioaddr5 is for the first subdevice only */
cs->hw.ax.plx_adr = pci_ioaddr1;
/* Enter all ipac_base addresses */
switch(cs->subtyp) {
case 1:
cs->hw.ax.base = pci_ioaddr5 + 0x00;
if (sct_alloc_io(pci_ioaddr1, 128))
return(0);
if (sct_alloc_io(pci_ioaddr5, 64))
return(0);
/* disable all IPAC */
writereg(pci_ioaddr5, pci_ioaddr5 + 4,
IPAC_MASK, 0xFF);
writereg(pci_ioaddr4 + 0x08, pci_ioaddr4 + 0x0c,
IPAC_MASK, 0xFF);
writereg(pci_ioaddr3 + 0x10, pci_ioaddr3 + 0x14,
IPAC_MASK, 0xFF);
writereg(pci_ioaddr2 + 0x20, pci_ioaddr2 + 0x24,
IPAC_MASK, 0xFF);
break;
case 2:
cs->hw.ax.base = pci_ioaddr4 + 0x08;
if (sct_alloc_io(pci_ioaddr4, 64))
return(0);
break;
case 3:
cs->hw.ax.base = pci_ioaddr3 + 0x10;
if (sct_alloc_io(pci_ioaddr3, 64))
return(0);
break;
case 4:
cs->hw.ax.base = pci_ioaddr2 + 0x20;
if (sct_alloc_io(pci_ioaddr2, 64))
return(0);
break;
}
/* For isac and hscx data path */
cs->hw.ax.data_adr = cs->hw.ax.base + 4;
printk(KERN_INFO "HiSax: %s (%s) configured at 0x%.4lX, 0x%.4lX, 0x%.4lX and IRQ %d\n",
CardType[card->typ],
sct_quadro_subtypes[cs->subtyp],
cs->hw.ax.plx_adr,
cs->hw.ax.base,
cs->hw.ax.data_adr,
cs->irq);
test_and_set_bit(HW_IPAC, &cs->HW_Flags);
cs->readisac = &ReadISAC;
cs->writeisac = &WriteISAC;
cs->readisacfifo = &ReadISACfifo;
cs->writeisacfifo = &WriteISACfifo;
cs->BC_Read_Reg = &ReadHSCX;
cs->BC_Write_Reg = &WriteHSCX;
cs->BC_Send_Data = &hscx_fill_fifo;
cs->cardmsg = &BKM_card_msg;
cs->irq_func = &bkm_interrupt_ipac;
printk(KERN_INFO "HiSax: %s (%s): IPAC Version %d\n",
CardType[card->typ],
sct_quadro_subtypes[cs->subtyp],
readreg(cs->hw.ax.base, cs->hw.ax.data_adr, IPAC_ID));
return (1);
#else
printk(KERN_ERR "HiSax: bkm_a8 only supported on PCI Systems\n");
#endif /* CONFIG_PCI */
}
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