linux/drivers/isdn/hisax/nj_s.c
Jeff Garzik 0566a66382 [ISDN] HiSax netjet_s: code movement, prep for hotplug
1) Remove CONFIG_PCI ifdefs.  PCI is required in Kconfig.

2) Break up setup_netjet_s() into three separate internal functions.
This helps facilitate upcoming use of PCI hotplug API, and in addition
makes the code much easier to follow.

No code is changed, just moved around.  I even kept the out-of-favor
"return(0)" style used in the current source code.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-07-17 17:18:29 -04:00

300 lines
8.2 KiB
C

/* $Id: nj_s.c,v 2.13.2.4 2004/01/16 01:53:48 keil Exp $
*
* 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 "isdnl1.h"
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/ppp_defs.h>
#include "netjet.h"
static const char *NETjet_S_revision = "$Revision: 2.13.2.4 $";
static u_char dummyrr(struct IsdnCardState *cs, int chan, u_char off)
{
return(5);
}
static void dummywr(struct IsdnCardState *cs, int chan, u_char off, u_char value)
{
}
static irqreturn_t
netjet_s_interrupt(int intno, void *dev_id)
{
struct IsdnCardState *cs = dev_id;
u_char val, s1val, s0val;
u_long flags;
spin_lock_irqsave(&cs->lock, flags);
s1val = bytein(cs->hw.njet.base + NETJET_IRQSTAT1);
if (!(s1val & NETJET_ISACIRQ)) {
val = NETjet_ReadIC(cs, ISAC_ISTA);
if (cs->debug & L1_DEB_ISAC)
debugl1(cs, "tiger: i1 %x %x", s1val, val);
if (val) {
isac_interrupt(cs, val);
NETjet_WriteIC(cs, ISAC_MASK, 0xFF);
NETjet_WriteIC(cs, ISAC_MASK, 0x0);
}
s1val = 1;
} else
s1val = 0;
/*
* read/write stat0 is better, because lower IRQ rate
* Note the IRQ is on for 125 us if a condition match
* thats long on modern CPU and so the IRQ is reentered
* all the time.
*/
s0val = bytein(cs->hw.njet.base + NETJET_IRQSTAT0);
if ((s0val | s1val)==0) { // shared IRQ
spin_unlock_irqrestore(&cs->lock, flags);
return IRQ_NONE;
}
if (s0val)
byteout(cs->hw.njet.base + NETJET_IRQSTAT0, s0val);
/* start new code 13/07/00 GE */
/* set bits in sval to indicate which page is free */
if (inl(cs->hw.njet.base + NETJET_DMA_WRITE_ADR) <
inl(cs->hw.njet.base + NETJET_DMA_WRITE_IRQ))
/* the 2nd write page is free */
s0val = 0x08;
else /* the 1st write page is free */
s0val = 0x04;
if (inl(cs->hw.njet.base + NETJET_DMA_READ_ADR) <
inl(cs->hw.njet.base + NETJET_DMA_READ_IRQ))
/* the 2nd read page is free */
s0val |= 0x02;
else /* the 1st read page is free */
s0val |= 0x01;
if (s0val != cs->hw.njet.last_is0) /* we have a DMA interrupt */
{
if (test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
printk(KERN_WARNING "nj LOCK_ATOMIC s0val %x->%x\n",
cs->hw.njet.last_is0, s0val);
spin_unlock_irqrestore(&cs->lock, flags);
return IRQ_HANDLED;
}
cs->hw.njet.irqstat0 = s0val;
if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_READ) !=
(cs->hw.njet.last_is0 & NETJET_IRQM0_READ))
/* we have a read dma int */
read_tiger(cs);
if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_WRITE) !=
(cs->hw.njet.last_is0 & NETJET_IRQM0_WRITE))
/* we have a write dma int */
write_tiger(cs);
/* end new code 13/07/00 GE */
test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
}
spin_unlock_irqrestore(&cs->lock, flags);
return IRQ_HANDLED;
}
static void
reset_netjet_s(struct IsdnCardState *cs)
{
cs->hw.njet.ctrl_reg = 0xff; /* Reset On */
byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
mdelay(10);
/* now edge triggered for TJ320 GE 13/07/00 */
/* see comment in IRQ function */
if (cs->subtyp) /* TJ320 */
cs->hw.njet.ctrl_reg = 0x40; /* Reset Off and status read clear */
else
cs->hw.njet.ctrl_reg = 0x00; /* Reset Off and status read clear */
byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
mdelay(10);
cs->hw.njet.auxd = 0;
cs->hw.njet.dmactrl = 0;
byteout(cs->hw.njet.base + NETJET_AUXCTRL, ~NETJET_ISACIRQ);
byteout(cs->hw.njet.base + NETJET_IRQMASK1, NETJET_ISACIRQ);
byteout(cs->hw.njet.auxa, cs->hw.njet.auxd);
}
static int
NETjet_S_card_msg(struct IsdnCardState *cs, int mt, void *arg)
{
u_long flags;
switch (mt) {
case CARD_RESET:
spin_lock_irqsave(&cs->lock, flags);
reset_netjet_s(cs);
spin_unlock_irqrestore(&cs->lock, flags);
return(0);
case CARD_RELEASE:
release_io_netjet(cs);
return(0);
case CARD_INIT:
reset_netjet_s(cs);
inittiger(cs);
spin_lock_irqsave(&cs->lock, flags);
clear_pending_isac_ints(cs);
initisac(cs);
/* Reenable all IRQ */
cs->writeisac(cs, ISAC_MASK, 0);
spin_unlock_irqrestore(&cs->lock, flags);
return(0);
case CARD_TEST:
return(0);
}
return(0);
}
static int __devinit njs_pci_probe(struct pci_dev *dev_netjet,
struct IsdnCardState *cs)
{
int cfg;
if (pci_enable_device(dev_netjet))
return(0);
pci_set_master(dev_netjet);
cs->irq = dev_netjet->irq;
if (!cs->irq) {
printk(KERN_WARNING "NETjet-S: No IRQ for PCI card found\n");
return(0);
}
cs->hw.njet.base = pci_resource_start(dev_netjet, 0);
if (!cs->hw.njet.base) {
printk(KERN_WARNING "NETjet-S: No IO-Adr for PCI card found\n");
return(0);
}
/* the TJ300 and TJ320 must be detected, the IRQ handling is different
* unfortunatly the chips use the same device ID, but the TJ320 has
* the bit20 in status PCI cfg register set
*/
pci_read_config_dword(dev_netjet, 0x04, &cfg);
if (cfg & 0x00100000)
cs->subtyp = 1; /* TJ320 */
else
cs->subtyp = 0; /* TJ300 */
/* 2001/10/04 Christoph Ersfeld, Formula-n Europe AG www.formula-n.com */
if ((dev_netjet->subsystem_vendor == 0x55) &&
(dev_netjet->subsystem_device == 0x02)) {
printk(KERN_WARNING "Netjet: You tried to load this driver with an incompatible TigerJet-card\n");
printk(KERN_WARNING "Use type=41 for Formula-n enter:now ISDN PCI and compatible\n");
return(0);
}
/* end new code */
return(1);
}
static int __devinit njs_cs_init(struct IsdnCard *card,
struct IsdnCardState *cs)
{
cs->hw.njet.auxa = cs->hw.njet.base + NETJET_AUXDATA;
cs->hw.njet.isac = cs->hw.njet.base | NETJET_ISAC_OFF;
cs->hw.njet.ctrl_reg = 0xff; /* Reset On */
byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
mdelay(10);
cs->hw.njet.ctrl_reg = 0x00; /* Reset Off and status read clear */
byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
mdelay(10);
cs->hw.njet.auxd = 0xC0;
cs->hw.njet.dmactrl = 0;
byteout(cs->hw.njet.base + NETJET_AUXCTRL, ~NETJET_ISACIRQ);
byteout(cs->hw.njet.base + NETJET_IRQMASK1, NETJET_ISACIRQ);
byteout(cs->hw.njet.auxa, cs->hw.njet.auxd);
switch ( ( ( NETjet_ReadIC( cs, ISAC_RBCH ) >> 5 ) & 3 ) )
{
case 0 :
return 1; /* end loop */
case 3 :
printk( KERN_WARNING "NETjet-S: NETspider-U PCI card found\n" );
return -1; /* continue looping */
default :
printk( KERN_WARNING "NETjet-S: No PCI card found\n" );
return 0; /* end loop & function */
}
return 1; /* end loop */
}
static int __devinit njs_cs_init_rest(struct IsdnCard *card,
struct IsdnCardState *cs)
{
const int bytecnt = 256;
printk(KERN_INFO
"NETjet-S: %s card configured at %#lx IRQ %d\n",
cs->subtyp ? "TJ320" : "TJ300", cs->hw.njet.base, cs->irq);
if (!request_region(cs->hw.njet.base, bytecnt, "netjet-s isdn")) {
printk(KERN_WARNING
"HiSax: %s config port %#lx-%#lx already in use\n",
CardType[card->typ],
cs->hw.njet.base,
cs->hw.njet.base + bytecnt);
return (0);
}
cs->readisac = &NETjet_ReadIC;
cs->writeisac = &NETjet_WriteIC;
cs->readisacfifo = &NETjet_ReadICfifo;
cs->writeisacfifo = &NETjet_WriteICfifo;
cs->BC_Read_Reg = &dummyrr;
cs->BC_Write_Reg = &dummywr;
cs->BC_Send_Data = &netjet_fill_dma;
setup_isac(cs);
cs->cardmsg = &NETjet_S_card_msg;
cs->irq_func = &netjet_s_interrupt;
cs->irq_flags |= IRQF_SHARED;
ISACVersion(cs, "NETjet-S:");
return (1);
}
static struct pci_dev *dev_netjet __devinitdata = NULL;
int __devinit
setup_netjet_s(struct IsdnCard *card)
{
int ret;
struct IsdnCardState *cs = card->cs;
char tmp[64];
#ifdef __BIG_ENDIAN
#error "not running on big endian machines now"
#endif
strcpy(tmp, NETjet_S_revision);
printk(KERN_INFO "HiSax: Traverse Tech. NETjet-S driver Rev. %s\n", HiSax_getrev(tmp));
if (cs->typ != ISDN_CTYPE_NETJET_S)
return(0);
test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
for ( ;; )
{
if ((dev_netjet = pci_find_device(PCI_VENDOR_ID_TIGERJET,
PCI_DEVICE_ID_TIGERJET_300, dev_netjet))) {
ret = njs_pci_probe(dev_netjet, cs);
if (!ret)
return(0);
} else {
printk(KERN_WARNING "NETjet-S: No PCI card found\n");
return(0);
}
ret = njs_cs_init(card, cs);
if (!ret)
return(0);
if (ret > 0)
break;
/* otherwise, ret < 0, continue looping */
}
return njs_cs_init_rest(card, cs);
}