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linux/drivers/isdn/act2000/act2000_isa.c
Hannes Eder cf80063a7d drivers/isdn/act2000: fix sparse warning: symbol shadows an earlier one 
Impact: Rename local variable 'c' to 't'.

Fix this sparse warning:
  drivers/isdn/act2000/act2000_isa.c:260:70: warning: symbol 'c' shadows an earlier one

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-27 01:00:41 -08:00

444 lines
12 KiB
C
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/* $Id: act2000_isa.c,v 1.11.6.3 2001/09/23 22:24:32 kai Exp $
*
* ISDN lowlevel-module for the IBM ISDN-S0 Active 2000 (ISA-Version).
*
* Author Fritz Elfert
* Copyright by Fritz Elfert <fritz@isdn4linux.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
* Thanks to Friedemann Baitinger and IBM Germany
*
*/
#include "act2000.h"
#include "act2000_isa.h"
#include "capi.h"
/*
* Reset Controller, then try to read the Card's signature.
+ Return:
* 1 = Signature found.
* 0 = Signature not found.
*/
static int
act2000_isa_reset(unsigned short portbase)
{
unsigned char reg;
int i;
int found;
int serial = 0;
found = 0;
if ((reg = inb(portbase + ISA_COR)) != 0xff) {
outb(reg | ISA_COR_RESET, portbase + ISA_COR);
mdelay(10);
outb(reg, portbase + ISA_COR);
mdelay(10);
for (i = 0; i < 16; i++) {
if (inb(portbase + ISA_ISR) & ISA_ISR_SERIAL)
serial |= 0x10000;
serial >>= 1;
}
if (serial == ISA_SER_ID)
found++;
}
return found;
}
int
act2000_isa_detect(unsigned short portbase)
{
int ret = 0;
if (request_region(portbase, ACT2000_PORTLEN, "act2000isa")) {
ret = act2000_isa_reset(portbase);
release_region(portbase, ISA_REGION);
}
return ret;
}
static irqreturn_t
act2000_isa_interrupt(int dummy, void *dev_id)
{
act2000_card *card = dev_id;
u_char istatus;
istatus = (inb(ISA_PORT_ISR) & 0x07);
if (istatus & ISA_ISR_OUT) {
/* RX fifo has data */
istatus &= ISA_ISR_OUT_MASK;
outb(0, ISA_PORT_SIS);
act2000_isa_receive(card);
outb(ISA_SIS_INT, ISA_PORT_SIS);
}
if (istatus & ISA_ISR_ERR) {
/* Error Interrupt */
istatus &= ISA_ISR_ERR_MASK;
printk(KERN_WARNING "act2000: errIRQ\n");
}
if (istatus)
printk(KERN_DEBUG "act2000: ?IRQ %d %02x\n", card->irq, istatus);
return IRQ_HANDLED;
}
static void
act2000_isa_select_irq(act2000_card * card)
{
unsigned char reg;
reg = (inb(ISA_PORT_COR) & ~ISA_COR_IRQOFF) | ISA_COR_PERR;
switch (card->irq) {
case 3:
reg = ISA_COR_IRQ03;
break;
case 5:
reg = ISA_COR_IRQ05;
break;
case 7:
reg = ISA_COR_IRQ07;
break;
case 10:
reg = ISA_COR_IRQ10;
break;
case 11:
reg = ISA_COR_IRQ11;
break;
case 12:
reg = ISA_COR_IRQ12;
break;
case 15:
reg = ISA_COR_IRQ15;
break;
}
outb(reg, ISA_PORT_COR);
}
static void
act2000_isa_enable_irq(act2000_card * card)
{
act2000_isa_select_irq(card);
/* Enable READ irq */
outb(ISA_SIS_INT, ISA_PORT_SIS);
}
/*
* Install interrupt handler, enable irq on card.
* If irq is -1, choose next free irq, else irq is given explicitly.
*/
int
act2000_isa_config_irq(act2000_card * card, short irq)
{
int old_irq;
if (card->flags & ACT2000_FLAGS_IVALID) {
free_irq(card->irq, card);
}
card->flags &= ~ACT2000_FLAGS_IVALID;
outb(ISA_COR_IRQOFF, ISA_PORT_COR);
if (!irq)
return 0;
old_irq = card->irq;
card->irq = irq;
if (request_irq(irq, &act2000_isa_interrupt, 0, card->regname, card)) {
card->irq = old_irq;
card->flags |= ACT2000_FLAGS_IVALID;
printk(KERN_WARNING
"act2000: Could not request irq %d\n",irq);
return -EBUSY;
} else {
act2000_isa_select_irq(card);
/* Disable READ and WRITE irq */
outb(0, ISA_PORT_SIS);
outb(0, ISA_PORT_SOS);
}
return 0;
}
int
act2000_isa_config_port(act2000_card * card, unsigned short portbase)
{
if (card->flags & ACT2000_FLAGS_PVALID) {
release_region(card->port, ISA_REGION);
card->flags &= ~ACT2000_FLAGS_PVALID;
}
if (request_region(portbase, ACT2000_PORTLEN, card->regname) == NULL)
return -EBUSY;
else {
card->port = portbase;
card->flags |= ACT2000_FLAGS_PVALID;
return 0;
}
}
/*
* Release ressources, used by an adaptor.
*/
void
act2000_isa_release(act2000_card * card)
{
unsigned long flags;
spin_lock_irqsave(&card->lock, flags);
if (card->flags & ACT2000_FLAGS_IVALID)
free_irq(card->irq, card);
card->flags &= ~ACT2000_FLAGS_IVALID;
if (card->flags & ACT2000_FLAGS_PVALID)
release_region(card->port, ISA_REGION);
card->flags &= ~ACT2000_FLAGS_PVALID;
spin_unlock_irqrestore(&card->lock, flags);
}
static int
act2000_isa_writeb(act2000_card * card, u_char data)
{
u_char timeout = 40;
while (timeout) {
if (inb(ISA_PORT_SOS) & ISA_SOS_READY) {
outb(data, ISA_PORT_SDO);
return 0;
} else {
timeout--;
udelay(10);
}
}
return 1;
}
static int
act2000_isa_readb(act2000_card * card, u_char * data)
{
u_char timeout = 40;
while (timeout) {
if (inb(ISA_PORT_SIS) & ISA_SIS_READY) {
*data = inb(ISA_PORT_SDI);
return 0;
} else {
timeout--;
udelay(10);
}
}
return 1;
}
void
act2000_isa_receive(act2000_card *card)
{
u_char c;
if (test_and_set_bit(ACT2000_LOCK_RX, (void *) &card->ilock) != 0)
return;
while (!act2000_isa_readb(card, &c)) {
if (card->idat.isa.rcvidx < 8) {
card->idat.isa.rcvhdr[card->idat.isa.rcvidx++] = c;
if (card->idat.isa.rcvidx == 8) {
int valid = actcapi_chkhdr(card, (actcapi_msghdr *)&card->idat.isa.rcvhdr);
if (valid) {
card->idat.isa.rcvlen = ((actcapi_msghdr *)&card->idat.isa.rcvhdr)->len;
card->idat.isa.rcvskb = dev_alloc_skb(card->idat.isa.rcvlen);
if (card->idat.isa.rcvskb == NULL) {
card->idat.isa.rcvignore = 1;
printk(KERN_WARNING
"act2000_isa_receive: no memory\n");
test_and_clear_bit(ACT2000_LOCK_RX, (void *) &card->ilock);
return;
}
memcpy(skb_put(card->idat.isa.rcvskb, 8), card->idat.isa.rcvhdr, 8);
card->idat.isa.rcvptr = skb_put(card->idat.isa.rcvskb, card->idat.isa.rcvlen - 8);
} else {
card->idat.isa.rcvidx = 0;
printk(KERN_WARNING
"act2000_isa_receive: Invalid CAPI msg\n");
{
int i; __u8 *p; __u8 *t; __u8 tmp[30];
for (i = 0, p = (__u8 *)&card->idat.isa.rcvhdr, t = tmp; i < 8; i++)
t += sprintf(t, "%02x ", *(p++));
printk(KERN_WARNING "act2000_isa_receive: %s\n", tmp);
}
}
}
} else {
if (!card->idat.isa.rcvignore)
*card->idat.isa.rcvptr++ = c;
if (++card->idat.isa.rcvidx >= card->idat.isa.rcvlen) {
if (!card->idat.isa.rcvignore) {
skb_queue_tail(&card->rcvq, card->idat.isa.rcvskb);
act2000_schedule_rx(card);
}
card->idat.isa.rcvidx = 0;
card->idat.isa.rcvlen = 8;
card->idat.isa.rcvignore = 0;
card->idat.isa.rcvskb = NULL;
card->idat.isa.rcvptr = card->idat.isa.rcvhdr;
}
}
}
if (!(card->flags & ACT2000_FLAGS_IVALID)) {
/* In polling mode, schedule myself */
if ((card->idat.isa.rcvidx) &&
(card->idat.isa.rcvignore ||
(card->idat.isa.rcvidx < card->idat.isa.rcvlen)))
act2000_schedule_poll(card);
}
test_and_clear_bit(ACT2000_LOCK_RX, (void *) &card->ilock);
}
void
act2000_isa_send(act2000_card * card)
{
unsigned long flags;
struct sk_buff *skb;
actcapi_msg *msg;
int l;
if (test_and_set_bit(ACT2000_LOCK_TX, (void *) &card->ilock) != 0)
return;
while (1) {
spin_lock_irqsave(&card->lock, flags);
if (!(card->sbuf)) {
if ((card->sbuf = skb_dequeue(&card->sndq))) {
card->ack_msg = card->sbuf->data;
msg = (actcapi_msg *)card->sbuf->data;
if ((msg->hdr.cmd.cmd == 0x86) &&
(msg->hdr.cmd.subcmd == 0) ) {
/* Save flags in message */
card->need_b3ack = msg->msg.data_b3_req.flags;
msg->msg.data_b3_req.flags = 0;
}
}
}
spin_unlock_irqrestore(&card->lock, flags);
if (!(card->sbuf)) {
/* No more data to send */
test_and_clear_bit(ACT2000_LOCK_TX, (void *) &card->ilock);
return;
}
skb = card->sbuf;
l = 0;
while (skb->len) {
if (act2000_isa_writeb(card, *(skb->data))) {
/* Fifo is full, but more data to send */
test_and_clear_bit(ACT2000_LOCK_TX, (void *) &card->ilock);
/* Schedule myself */
act2000_schedule_tx(card);
return;
}
skb_pull(skb, 1);
l++;
}
msg = (actcapi_msg *)card->ack_msg;
if ((msg->hdr.cmd.cmd == 0x86) &&
(msg->hdr.cmd.subcmd == 0) ) {
/*
* If it's user data, reset data-ptr
* and put skb into ackq.
*/
skb->data = card->ack_msg;
/* Restore flags in message */
msg->msg.data_b3_req.flags = card->need_b3ack;
skb_queue_tail(&card->ackq, skb);
} else
dev_kfree_skb(skb);
card->sbuf = NULL;
}
}
/*
* Get firmware ID, check for 'ISDN' signature.
*/
static int
act2000_isa_getid(act2000_card * card)
{
act2000_fwid fid;
u_char *p = (u_char *) & fid;
int count = 0;
while (1) {
if (count > 510)
return -EPROTO;
if (act2000_isa_readb(card, p++))
break;
count++;
}
if (count <= 20) {
printk(KERN_WARNING "act2000: No Firmware-ID!\n");
return -ETIME;
}
*p = '\0';
fid.revlen[0] = '\0';
if (strcmp(fid.isdn, "ISDN")) {
printk(KERN_WARNING "act2000: Wrong Firmware-ID!\n");
return -EPROTO;
}
if ((p = strchr(fid.revision, '\n')))
*p = '\0';
printk(KERN_INFO "act2000: Firmware-ID: %s\n", fid.revision);
if (card->flags & ACT2000_FLAGS_IVALID) {
printk(KERN_DEBUG "Enabling Interrupts ...\n");
act2000_isa_enable_irq(card);
}
return 0;
}
/*
* Download microcode into card, check Firmware signature.
*/
int
act2000_isa_download(act2000_card * card, act2000_ddef __user * cb)
{
unsigned int length;
int l;
int c;
long timeout;
u_char *b;
u_char __user *p;
u_char *buf;
act2000_ddef cblock;
if (!act2000_isa_reset(card->port))
return -ENXIO;
msleep_interruptible(500);
if (copy_from_user(&cblock, cb, sizeof(cblock)))
return -EFAULT;
length = cblock.length;
p = cblock.buffer;
if (!access_ok(VERIFY_READ, p, length))
return -EFAULT;
buf = kmalloc(1024, GFP_KERNEL);
if (!buf)
return -ENOMEM;
timeout = 0;
while (length) {
l = (length > 1024) ? 1024 : length;
c = 0;
b = buf;
if (copy_from_user(buf, p, l)) {
kfree(buf);
return -EFAULT;
}
while (c < l) {
if (act2000_isa_writeb(card, *b++)) {
printk(KERN_WARNING
"act2000: loader timed out"
" len=%d c=%d\n", length, c);
kfree(buf);
return -ETIME;
}
c++;
}
length -= l;
p += l;
}
kfree(buf);
msleep_interruptible(500);
return (act2000_isa_getid(card));
}
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