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/* $Id: tpam_queues.c,v 1.1.2.1 2001/11/20 14:19:37 kai Exp $
*
* Turbo PAM ISDN driver for Linux. (Kernel Driver)
*
* Copyright 2001 Stelian Pop <stelian.pop@fr.alcove.com>, Alcôve
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
* For all support questions please contact: <support@auvertech.fr>
*
*/
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/tqueue.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include "tpam.h"
/* Local function prototype */
static int tpam_sendpacket(tpam_card *card, tpam_channel *channel);
/*
* Queue a message to be send to the card when possible.
*
* card: the board
* skb: the sk_buff containing the message.
*/
void tpam_enqueue(tpam_card *card, struct sk_buff *skb) {
dprintk("TurboPAM(tpam_enqueue): card=%d\n", card->id);
/* queue the sk_buff on the board's send queue */
skb_queue_tail(&card->sendq, skb);
/* queue the board's send task struct for immediate treatment */
queue_task(&card->send_tq, &tq_immediate);
mark_bh(IMMEDIATE_BH);
}
/*
* Queue a data message to be send to the card when possible.
*
* card: the board
* skb: the sk_buff containing the message and the data. This parameter
* can be NULL if we want just to trigger the send of queued
* messages.
*/
void tpam_enqueue_data(tpam_channel *channel, struct sk_buff *skb) {
dprintk("TurboPAM(tpam_enqueue_data): card=%d, channel=%d\n",
channel->card->id, channel->num);
/* if existant, queue the sk_buff on the channel's send queue */
if (skb)
skb_queue_tail(&channel->sendq, skb);
/* queue the channel's send task struct for immediate treatment */
queue_task(&channel->card->send_tq, &tq_immediate);
mark_bh(IMMEDIATE_BH);
}
/*
* IRQ handler.
*
* If a message comes from the board we read it, construct a sk_buff containing
* the message and we queue the sk_buff on the board's receive queue, and we
* trigger the execution of the board's receive task queue.
*
* If a message ack comes from the board we can go on and send a new message,
* so we trigger the execution of the board's send task queue.
*
* irq: the irq number
* dev_id: the registered board to the irq
* regs: not used.
*/
void tpam_irq(int irq, void *dev_id, struct pt_regs *regs) {
tpam_card *card = (tpam_card *)dev_id;
u32 ackupload, uploadptr;
u32 waiting_too_long;
u32 hpic;
struct sk_buff *skb;
pci_mpb mpb;
skb_header *skbh;
dprintk("TurboPAM(tpam_irq): IRQ received, card=%d\n", card->id);
/* grab the board lock */
spin_lock(&card->lock);
/* get the message type */
ackupload = copy_from_pam_dword(card, (void *)TPAM_ACKUPLOAD_REGISTER);
/* acknowledge the interrupt */
copy_to_pam_dword(card, (void *)TPAM_INTERRUPTACK_REGISTER, 0);
readl(card->bar0 + TPAM_HINTACK_REGISTER);
if (!ackupload) {
/* it is a new message from the board */
dprintk("TurboPAM(tpam_irq): message received, card=%d\n",
card->id);
/* get the upload pointer */
uploadptr = copy_from_pam_dword(card,
(void *)TPAM_UPLOADPTR_REGISTER);
/* get the beginning of the message (pci_mpb part) */
copy_from_pam(card, &mpb, (void *)uploadptr, sizeof(pci_mpb));
/* allocate the sk_buff */
if (!(skb = alloc_skb(sizeof(skb_header) + sizeof(pci_mpb) +
mpb.actualBlockTLVSize +
mpb.actualDataSize, GFP_ATOMIC))) {
printk(KERN_ERR "TurboPAM(tpam_irq): "
"alloc_skb failed\n");
spin_unlock(&card->lock);
return;
}
/* build the skb_header */
skbh = (skb_header *)skb_put(skb, sizeof(skb_header));
skbh->size = sizeof(pci_mpb) + mpb.actualBlockTLVSize;
skbh->data_size = mpb.actualDataSize;
skbh->ack = 0;
skbh->ack_size = 0;
/* copy the pci_mpb into the sk_buff */
memcpy(skb_put(skb, sizeof(pci_mpb)), &mpb, sizeof(pci_mpb));
/* copy the TLV block into the sk_buff */
copy_from_pam(card, skb_put(skb, mpb.actualBlockTLVSize),
(void *)uploadptr + sizeof(pci_mpb),
mpb.actualBlockTLVSize);
/* if existent, copy the data block into the sk_buff */
if (mpb.actualDataSize)
copy_from_pam(card, skb_put(skb, mpb.actualDataSize),
(void *)uploadptr + sizeof(pci_mpb) + 4096,
mpb.actualDataSize);
/* wait for the board to become ready */
waiting_too_long = 0;
do {
hpic = readl(card->bar0 + TPAM_HPIC_REGISTER);
if (waiting_too_long++ > 0xfffffff) {
spin_unlock(&card->lock);
printk(KERN_ERR "TurboPAM(tpam_irq): "
"waiting too long...\n");
return;
}
} while (hpic & 0x00000002);
/* acknowledge the message */
copy_to_pam_dword(card, (void *)TPAM_ACKDOWNLOAD_REGISTER,
0xffffffff);
readl(card->bar0 + TPAM_DSPINT_REGISTER);
/* release the board lock */
spin_unlock(&card->lock);
if (mpb.messageID == ID_U3ReadyToReceiveInd) {
/* this message needs immediate treatment */
tpam_recv_U3ReadyToReceiveInd(card, skb);
kfree_skb(skb);
}
else {
/* put the message in the receive queue */
skb_queue_tail(&card->recvq, skb);
queue_task(&card->recv_tq, &tq_immediate);
mark_bh(IMMEDIATE_BH);
}
return;
}
else {
/* it is a ack from the board */
dprintk("TurboPAM(tpam_irq): message acknowledged, card=%d\n",
card->id);
/* board is not busy anymore */
card->busy = 0;
/* release the lock */
spin_unlock(&card->lock);
/* schedule the send queue for execution */
queue_task(&card->send_tq, &tq_immediate);
mark_bh(IMMEDIATE_BH);
return;
}
/* not reached */
}
/*
* Run the board's receive task queue, dispatching each message on the queue,
* to its treatment function.
*
* card: the board.
*/
void tpam_recv_tq(tpam_card *card) {
pci_mpb *p;
struct sk_buff *skb;
/* for each message on the receive queue... */
while ((skb = skb_dequeue(&card->recvq))) {
/* point to the pci_mpb block */
p = (pci_mpb *)(skb->data + sizeof(skb_header));
/* dispatch the message */
switch (p->messageID) {
case ID_ACreateNCOCnf:
tpam_recv_ACreateNCOCnf(card, skb);
break;
case ID_ADestroyNCOCnf:
tpam_recv_ADestroyNCOCnf(card, skb);
break;
case ID_CConnectCnf:
tpam_recv_CConnectCnf(card, skb);
break;
case ID_CConnectInd:
tpam_recv_CConnectInd(card, skb);
break;
case ID_CDisconnectInd:
tpam_recv_CDisconnectInd(card, skb);
break;
case ID_CDisconnectCnf:
tpam_recv_CDisconnectCnf(card, skb);
break;
case ID_U3DataInd:
tpam_recv_U3DataInd(card, skb);
break;
default:
dprintk("TurboPAM(tpam_recv_tq): "
"unknown messageID %d, card=%d\n",
p->messageID, card->id);
break;
}
/* free the sk_buff */
kfree_skb(skb);
}
}
/*
* Run the board's send task queue. If there is a message in the board's send
* queue, it gets sended. If not, it examines each channel (one at the time,
* using a round robin algorithm). For each channel, if there is a message
* in the channel's send queue, it gets sended. This function sends only one
* message, it does not consume all the queue.
*/
void tpam_send_tq(tpam_card *card) {
int i;
/* first, try to send a packet from the board's send queue */
if (tpam_sendpacket(card, NULL))
return;
/* then, try each channel, in a round-robin manner */
for (i=card->roundrobin; i<card->roundrobin+card->channels_used; i++) {
if (tpam_sendpacket(card,
&card->channels[i % card->channels_used])) {
card->roundrobin = (i + 1) % card->channels_used;
return;
}
}
}
/*
* Try to send a packet from the board's send queue or from the channel's
* send queue.
*
* card: the board.
* channel: the channel (if NULL, the packet will be taken from the
* board's send queue. If not, it will be taken from the
* channel's send queue.
*
* Return: 0 if tpam_send_tq must try another card/channel combination
* (meaning that no packet has been send), 1 if no more packets
* can be send at that time (a packet has been send or the card is
* still busy from a previous send).
*/
static int tpam_sendpacket(tpam_card *card, tpam_channel *channel) {
struct sk_buff *skb;
u32 hpic;
u32 downloadptr;
skb_header *skbh;
u32 waiting_too_long;
dprintk("TurboPAM(tpam_sendpacket), card=%d, channel=%d\n",
card->id, channel ? channel->num : -1);
if (channel) {
/* dequeue a packet from the channel's send queue */
if (!(skb = skb_dequeue(&channel->sendq))) {
dprintk("TurboPAM(tpam_sendpacket): "
"card=%d, channel=%d, no packet\n",
card->id, channel->num);
return 0;
}
/* if the channel is not ready to receive, requeue the packet
* and return 0 to give a chance to another channel */
if (!channel->readytoreceive) {
dprintk("TurboPAM(tpam_sendpacket): "
"card=%d, channel=%d, channel not ready\n",
card->id, channel->num);
skb_queue_head(&channel->sendq, skb);
return 0;
}
/* grab the board lock */
spin_lock_irq(&card->lock);
/* if the board is busy, requeue the packet and return 1 since
* there is no need to try another channel */
if (card->busy) {
dprintk("TurboPAM(tpam_sendpacket): "
"card=%d, channel=%d, card busy\n",
card->id, channel->num);
skb_queue_head(&channel->sendq, skb);
spin_unlock_irq(&card->lock);
return 1;
}
}
else {
/* dequeue a packet from the board's send queue */
if (!(skb = skb_dequeue(&card->sendq))) {
dprintk("TurboPAM(tpam_sendpacket): "
"card=%d, no packet\n", card->id);
return 0;
}
/* grab the board lock */
spin_lock_irq(&card->lock);
/* if the board is busy, requeue the packet and return 1 since
* there is no need to try another channel */
if (card->busy) {
dprintk("TurboPAM(tpam_sendpacket): "
"card=%d, card busy\n", card->id);
skb_queue_head(&card->sendq, skb);
spin_unlock_irq(&card->lock);
return 1;
}
}
/* wait for the board to become ready */
waiting_too_long = 0;
do {
hpic = readl(card->bar0 + TPAM_HPIC_REGISTER);
if (waiting_too_long++ > 0xfffffff) {
spin_unlock_irq(&card->lock);
printk(KERN_ERR "TurboPAM(tpam_sendpacket): "
"waiting too long...\n");
return 1;
}
} while (hpic & 0x00000002);
skbh = (skb_header *)skb->data;
dprintk("TurboPAM(tpam_sendpacket): "
"card=%d, card ready, sending %d/%d bytes\n",
card->id, skbh->size, skbh->data_size);
/* get the board's download pointer */
downloadptr = copy_from_pam_dword(card,
(void *)TPAM_DOWNLOADPTR_REGISTER);
/* copy the packet to the board at the downloadptr location */
copy_to_pam(card, (void *)downloadptr, skb->data + sizeof(skb_header),
skbh->size);
if (skbh->data_size)
/* if there is some data in the packet, copy it too */
copy_to_pam(card, (void *)downloadptr + sizeof(pci_mpb) + 4096,
skb->data + sizeof(skb_header) + skbh->size,
skbh->data_size);
/* card will become busy right now */
card->busy = 1;
/* interrupt the board */
copy_to_pam_dword(card, (void *)TPAM_ACKDOWNLOAD_REGISTER, 0);
readl(card->bar0 + TPAM_DSPINT_REGISTER);
/* release the lock */
spin_unlock_irq(&card->lock);
/* if a data ack was requested by the ISDN link layer, send it now */
if (skbh->ack) {
isdn_ctrl ctrl;
ctrl.driver = card->id;
ctrl.command = ISDN_STAT_BSENT;
ctrl.arg = channel->num;
ctrl.parm.length = skbh->ack_size;
(* card->interface.statcallb)(&ctrl);
}
/* free the sk_buff */
kfree_skb(skb);
return 1;
}
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