402 lines
11 KiB
C
402 lines
11 KiB
C
/* $Id: tpam_queues.c,v 1.1.2.2 2001/09/23 22:25:03 kai Exp $
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*
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* Turbo PAM ISDN driver for Linux. (Kernel Driver)
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*
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* Copyright 2001 Stelian Pop <stelian.pop@fr.alcove.com>, Alcôve
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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* For all support questions please contact: <support@auvertech.fr>
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*
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*/
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <linux/workqueue.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include "tpam.h"
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/* Local function prototype */
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static int tpam_sendpacket(tpam_card *card, tpam_channel *channel);
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/*
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* Queue a message to be send to the card when possible.
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*
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* card: the board
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* skb: the sk_buff containing the message.
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*/
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void tpam_enqueue(tpam_card *card, struct sk_buff *skb) {
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pr_debug("TurboPAM(tpam_enqueue): card=%d\n", card->id);
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/* queue the sk_buff on the board's send queue */
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skb_queue_tail(&card->sendq, skb);
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/* queue the board's send task struct for immediate treatment */
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schedule_work(&card->send_tq);
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}
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/*
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* Queue a data message to be send to the card when possible.
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*
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* card: the board
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* skb: the sk_buff containing the message and the data. This parameter
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* can be NULL if we want just to trigger the send of queued
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* messages.
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*/
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void tpam_enqueue_data(tpam_channel *channel, struct sk_buff *skb) {
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pr_debug("TurboPAM(tpam_enqueue_data): card=%d, channel=%d\n",
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channel->card->id, channel->num);
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/* if existant, queue the sk_buff on the channel's send queue */
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if (skb)
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skb_queue_tail(&channel->sendq, skb);
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/* queue the channel's send task struct for immediate treatment */
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schedule_work(&channel->card->send_tq);
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}
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/*
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* IRQ handler.
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*
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* If a message comes from the board we read it, construct a sk_buff containing
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* the message and we queue the sk_buff on the board's receive queue, and we
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* trigger the execution of the board's receive task queue.
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*
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* If a message ack comes from the board we can go on and send a new message,
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* so we trigger the execution of the board's send task queue.
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*
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* irq: the irq number
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* dev_id: the registered board to the irq
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* regs: not used.
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*/
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irqreturn_t tpam_irq(int irq, void *dev_id, struct pt_regs *regs)
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{
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tpam_card *card = (tpam_card *)dev_id;
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u32 ackupload, uploadptr;
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u32 waiting_too_long;
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u32 hpic;
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struct sk_buff *skb;
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pci_mpb mpb;
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skb_header *skbh;
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pr_debug("TurboPAM(tpam_irq): IRQ received, card=%d\n", card->id);
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/* grab the board lock */
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spin_lock(&card->lock);
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/* get the message type */
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ackupload = copy_from_pam_dword(card, TPAM_ACKUPLOAD_REGISTER);
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/* acknowledge the interrupt */
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copy_to_pam_dword(card, TPAM_INTERRUPTACK_REGISTER, 0);
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readl(card->bar0 + TPAM_HINTACK_REGISTER);
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if (!ackupload) {
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/* it is a new message from the board */
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pr_debug("TurboPAM(tpam_irq): message received, card=%d\n",
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card->id);
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/* get the upload pointer */
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uploadptr = copy_from_pam_dword(card,
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TPAM_UPLOADPTR_REGISTER);
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/* get the beginning of the message (pci_mpb part) */
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copy_from_pam(card, &mpb, uploadptr, sizeof(pci_mpb));
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/* allocate the sk_buff */
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if (!(skb = alloc_skb(sizeof(skb_header) + sizeof(pci_mpb) +
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mpb.actualBlockTLVSize +
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mpb.actualDataSize, GFP_ATOMIC))) {
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printk(KERN_ERR "TurboPAM(tpam_irq): "
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"alloc_skb failed\n");
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spin_unlock(&card->lock);
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return IRQ_HANDLED;
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}
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/* build the skb_header */
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skbh = (skb_header *)skb_put(skb, sizeof(skb_header));
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skbh->size = sizeof(pci_mpb) + mpb.actualBlockTLVSize;
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skbh->data_size = mpb.actualDataSize;
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skbh->ack = 0;
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skbh->ack_size = 0;
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/* copy the pci_mpb into the sk_buff */
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memcpy(skb_put(skb, sizeof(pci_mpb)), &mpb, sizeof(pci_mpb));
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/* copy the TLV block into the sk_buff */
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copy_from_pam(card, skb_put(skb, mpb.actualBlockTLVSize),
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uploadptr + sizeof(pci_mpb),
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mpb.actualBlockTLVSize);
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/* if existent, copy the data block into the sk_buff */
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if (mpb.actualDataSize)
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copy_from_pam(card, skb_put(skb, mpb.actualDataSize),
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uploadptr + sizeof(pci_mpb) + 4096,
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mpb.actualDataSize);
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/* wait for the board to become ready */
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waiting_too_long = 0;
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do {
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hpic = readl(card->bar0 + TPAM_HPIC_REGISTER);
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if (waiting_too_long++ > 0xfffffff) {
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kfree_skb(skb);
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spin_unlock(&card->lock);
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printk(KERN_ERR "TurboPAM(tpam_irq): "
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"waiting too long...\n");
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return IRQ_HANDLED;
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}
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} while (hpic & 0x00000002);
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/* acknowledge the message */
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copy_to_pam_dword(card, TPAM_ACKDOWNLOAD_REGISTER,
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0xffffffff);
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readl(card->bar0 + TPAM_DSPINT_REGISTER);
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/* release the board lock */
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spin_unlock(&card->lock);
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if (mpb.messageID == ID_U3ReadyToReceiveInd) {
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/* this message needs immediate treatment */
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tpam_recv_U3ReadyToReceiveInd(card, skb);
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kfree_skb(skb);
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}
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else {
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/* put the message in the receive queue */
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skb_queue_tail(&card->recvq, skb);
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schedule_work(&card->recv_tq);
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}
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return IRQ_HANDLED;
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}
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else {
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/* it is a ack from the board */
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pr_debug("TurboPAM(tpam_irq): message acknowledged, card=%d\n",
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card->id);
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/* board is not busy anymore */
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card->busy = 0;
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/* release the lock */
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spin_unlock(&card->lock);
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/* schedule the send queue for execution */
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schedule_work(&card->send_tq);
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}
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return IRQ_HANDLED;
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}
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/*
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* Run the board's receive task queue, dispatching each message on the queue,
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* to its treatment function.
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*
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* card: the board.
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*/
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void tpam_recv_tq(tpam_card *card) {
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pci_mpb *p;
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struct sk_buff *skb;
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/* for each message on the receive queue... */
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while ((skb = skb_dequeue(&card->recvq))) {
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/* point to the pci_mpb block */
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p = (pci_mpb *)(skb->data + sizeof(skb_header));
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/* dispatch the message */
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switch (p->messageID) {
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case ID_ACreateNCOCnf:
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tpam_recv_ACreateNCOCnf(card, skb);
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break;
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case ID_ADestroyNCOCnf:
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tpam_recv_ADestroyNCOCnf(card, skb);
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break;
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case ID_CConnectCnf:
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tpam_recv_CConnectCnf(card, skb);
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break;
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case ID_CConnectInd:
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tpam_recv_CConnectInd(card, skb);
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break;
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case ID_CDisconnectInd:
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tpam_recv_CDisconnectInd(card, skb);
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break;
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case ID_CDisconnectCnf:
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tpam_recv_CDisconnectCnf(card, skb);
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break;
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case ID_U3DataInd:
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tpam_recv_U3DataInd(card, skb);
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break;
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default:
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pr_debug("TurboPAM(tpam_recv_tq): "
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"unknown messageID %d, card=%d\n",
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p->messageID, card->id);
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break;
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}
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/* free the sk_buff */
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kfree_skb(skb);
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}
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}
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/*
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* Run the board's send task queue. If there is a message in the board's send
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* queue, it gets sended. If not, it examines each channel (one at the time,
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* using a round robin algorithm). For each channel, if there is a message
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* in the channel's send queue, it gets sended. This function sends only one
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* message, it does not consume all the queue.
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*/
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void tpam_send_tq(tpam_card *card) {
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int i;
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/* first, try to send a packet from the board's send queue */
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if (tpam_sendpacket(card, NULL))
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return;
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/* then, try each channel, in a round-robin manner */
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for (i=card->roundrobin; i<card->roundrobin+card->channels_used; i++) {
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if (tpam_sendpacket(card,
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&card->channels[i % card->channels_used])) {
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card->roundrobin = (i + 1) % card->channels_used;
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return;
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}
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}
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}
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/*
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* Try to send a packet from the board's send queue or from the channel's
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* send queue.
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*
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* card: the board.
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* channel: the channel (if NULL, the packet will be taken from the
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* board's send queue. If not, it will be taken from the
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* channel's send queue.
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*
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* Return: 0 if tpam_send_tq must try another card/channel combination
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* (meaning that no packet has been send), 1 if no more packets
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* can be send at that time (a packet has been send or the card is
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* still busy from a previous send).
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*/
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static int tpam_sendpacket(tpam_card *card, tpam_channel *channel) {
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struct sk_buff *skb;
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u32 hpic;
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u32 downloadptr;
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skb_header *skbh;
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u32 waiting_too_long;
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pr_debug("TurboPAM(tpam_sendpacket), card=%d, channel=%d\n",
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card->id, channel ? channel->num : -1);
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if (channel) {
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/* dequeue a packet from the channel's send queue */
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if (!(skb = skb_dequeue(&channel->sendq))) {
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pr_debug("TurboPAM(tpam_sendpacket): "
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"card=%d, channel=%d, no packet\n",
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card->id, channel->num);
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return 0;
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}
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/* if the channel is not ready to receive, requeue the packet
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* and return 0 to give a chance to another channel */
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if (!channel->readytoreceive) {
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pr_debug("TurboPAM(tpam_sendpacket): "
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"card=%d, channel=%d, channel not ready\n",
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card->id, channel->num);
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skb_queue_head(&channel->sendq, skb);
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return 0;
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}
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/* grab the board lock */
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spin_lock_irq(&card->lock);
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/* if the board is busy, requeue the packet and return 1 since
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* there is no need to try another channel */
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if (card->busy) {
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pr_debug("TurboPAM(tpam_sendpacket): "
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"card=%d, channel=%d, card busy\n",
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card->id, channel->num);
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skb_queue_head(&channel->sendq, skb);
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spin_unlock_irq(&card->lock);
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return 1;
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}
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}
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else {
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/* dequeue a packet from the board's send queue */
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if (!(skb = skb_dequeue(&card->sendq))) {
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pr_debug("TurboPAM(tpam_sendpacket): "
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"card=%d, no packet\n", card->id);
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return 0;
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}
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/* grab the board lock */
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spin_lock_irq(&card->lock);
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/* if the board is busy, requeue the packet and return 1 since
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* there is no need to try another channel */
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if (card->busy) {
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pr_debug("TurboPAM(tpam_sendpacket): "
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"card=%d, card busy\n", card->id);
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skb_queue_head(&card->sendq, skb);
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spin_unlock_irq(&card->lock);
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return 1;
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}
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}
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/* wait for the board to become ready */
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waiting_too_long = 0;
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do {
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hpic = readl(card->bar0 + TPAM_HPIC_REGISTER);
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if (waiting_too_long++ > 0xfffffff) {
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spin_unlock_irq(&card->lock);
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printk(KERN_ERR "TurboPAM(tpam_sendpacket): "
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"waiting too long...\n");
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return 1;
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}
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} while (hpic & 0x00000002);
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skbh = (skb_header *)skb->data;
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pr_debug("TurboPAM(tpam_sendpacket): "
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"card=%d, card ready, sending %d/%d bytes\n",
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card->id, skbh->size, skbh->data_size);
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/* get the board's download pointer */
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downloadptr = copy_from_pam_dword(card, TPAM_DOWNLOADPTR_REGISTER);
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/* copy the packet to the board at the downloadptr location */
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copy_to_pam(card, downloadptr, skb->data + sizeof(skb_header),
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skbh->size);
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if (skbh->data_size)
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/* if there is some data in the packet, copy it too */
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copy_to_pam(card, downloadptr + sizeof(pci_mpb) + 4096,
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skb->data + sizeof(skb_header) + skbh->size,
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skbh->data_size);
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/* card will become busy right now */
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card->busy = 1;
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/* interrupt the board */
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copy_to_pam_dword(card, TPAM_ACKDOWNLOAD_REGISTER, 0);
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readl(card->bar0 + TPAM_DSPINT_REGISTER);
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/* release the lock */
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spin_unlock_irq(&card->lock);
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/* if a data ack was requested by the ISDN link layer, send it now */
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if (skbh->ack) {
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isdn_ctrl ctrl;
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ctrl.driver = card->id;
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ctrl.command = ISDN_STAT_BSENT;
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ctrl.arg = channel->num;
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ctrl.parm.length = skbh->ack_size;
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(* card->interface.statcallb)(&ctrl);
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}
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/* free the sk_buff */
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kfree_skb(skb);
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return 1;
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}
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