mirror of
https://github.com/adulau/aha.git
synced 2024-12-30 20:56:23 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
732 lines
14 KiB
C
732 lines
14 KiB
C
/*
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* PCBIT-D low-layer interface
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*
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* Copyright (C) 1996 Universidade de Lisboa
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*
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* Written by Pedro Roque Marques (roque@di.fc.ul.pt)
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*
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* This software may be used and distributed according to the terms of
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* the GNU General Public License, incorporated herein by reference.
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*/
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/*
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* 19991203 - Fernando Carvalho - takion@superbofh.org
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* Hacked to compile with egcs and run with current version of isdn modules
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*/
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/*
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* Based on documentation provided by Inesc:
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* - "Interface com bus do PC para o PCBIT e PCBIT-D", Inesc, Jan 93
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*/
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/*
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* TODO: better handling of errors
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* re-write/remove debug printks
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*/
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/mm.h>
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#include <linux/skbuff.h>
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#include <linux/isdnif.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include "pcbit.h"
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#include "layer2.h"
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#include "edss1.h"
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#undef DEBUG_FRAG
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/*
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* task queue struct
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*/
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/*
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* Layer 3 packet demultiplexer
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* drv.c
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*/
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extern void pcbit_l3_receive(struct pcbit_dev *dev, ulong msg,
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struct sk_buff *skb,
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ushort hdr_len, ushort refnum);
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/*
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* Prototypes
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*/
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void pcbit_deliver(void *data);
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static void pcbit_transmit(struct pcbit_dev *dev);
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static void pcbit_recv_ack(struct pcbit_dev *dev, unsigned char ack);
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static void pcbit_l2_error(struct pcbit_dev *dev);
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static void pcbit_l2_active_conf(struct pcbit_dev *dev, u_char info);
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static void pcbit_l2_err_recover(unsigned long data);
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static void pcbit_firmware_bug(struct pcbit_dev *dev);
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static __inline__ void
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pcbit_sched_delivery(struct pcbit_dev *dev)
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{
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schedule_work(&dev->qdelivery);
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}
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/*
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* Called from layer3
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*/
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int
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pcbit_l2_write(struct pcbit_dev *dev, ulong msg, ushort refnum,
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struct sk_buff *skb, unsigned short hdr_len)
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{
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struct frame_buf *frame,
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*ptr;
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unsigned long flags;
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if (dev->l2_state != L2_RUNNING && dev->l2_state != L2_LOADING) {
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dev_kfree_skb(skb);
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return -1;
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}
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if ((frame = (struct frame_buf *) kmalloc(sizeof(struct frame_buf),
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GFP_ATOMIC)) == NULL) {
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printk(KERN_WARNING "pcbit_2_write: kmalloc failed\n");
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dev_kfree_skb(skb);
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return -1;
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}
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frame->msg = msg;
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frame->refnum = refnum;
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frame->copied = 0;
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frame->hdr_len = hdr_len;
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if (skb)
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frame->dt_len = skb->len - hdr_len;
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else
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frame->dt_len = 0;
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frame->skb = skb;
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frame->next = NULL;
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spin_lock_irqsave(&dev->lock, flags);
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if (dev->write_queue == NULL) {
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dev->write_queue = frame;
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spin_unlock_irqrestore(&dev->lock, flags);
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pcbit_transmit(dev);
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} else {
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for (ptr = dev->write_queue; ptr->next; ptr = ptr->next);
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ptr->next = frame;
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spin_unlock_irqrestore(&dev->lock, flags);
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}
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return 0;
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}
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static __inline__ void
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pcbit_tx_update(struct pcbit_dev *dev, ushort len)
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{
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u_char info;
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dev->send_seq = (dev->send_seq + 1) % 8;
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dev->fsize[dev->send_seq] = len;
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info = 0;
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info |= dev->rcv_seq << 3;
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info |= dev->send_seq;
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writeb(info, dev->sh_mem + BANK4);
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}
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/*
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* called by interrupt service routine or by write_2
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*/
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static void
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pcbit_transmit(struct pcbit_dev *dev)
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{
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struct frame_buf *frame = NULL;
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unsigned char unacked;
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int flen; /* fragment frame length including all headers */
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int free;
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int count,
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cp_len;
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unsigned long flags;
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unsigned short tt;
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if (dev->l2_state != L2_RUNNING && dev->l2_state != L2_LOADING)
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return;
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unacked = (dev->send_seq + (8 - dev->unack_seq)) & 0x07;
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spin_lock_irqsave(&dev->lock, flags);
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if (dev->free > 16 && dev->write_queue && unacked < 7) {
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if (!dev->w_busy)
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dev->w_busy = 1;
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else {
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spin_unlock_irqrestore(&dev->lock, flags);
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return;
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}
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frame = dev->write_queue;
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free = dev->free;
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spin_unlock_irqrestore(&dev->lock, flags);
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if (frame->copied == 0) {
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/* Type 0 frame */
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ulong msg;
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if (frame->skb)
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flen = FRAME_HDR_LEN + PREHDR_LEN + frame->skb->len;
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else
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flen = FRAME_HDR_LEN + PREHDR_LEN;
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if (flen > free)
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flen = free;
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msg = frame->msg;
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/*
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* Board level 2 header
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*/
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pcbit_writew(dev, flen - FRAME_HDR_LEN);
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pcbit_writeb(dev, GET_MSG_CPU(msg));
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pcbit_writeb(dev, GET_MSG_PROC(msg));
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/* TH */
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pcbit_writew(dev, frame->hdr_len + PREHDR_LEN);
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/* TD */
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pcbit_writew(dev, frame->dt_len);
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/*
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* Board level 3 fixed-header
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*/
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/* LEN = TH */
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pcbit_writew(dev, frame->hdr_len + PREHDR_LEN);
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/* XX */
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pcbit_writew(dev, 0);
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/* C + S */
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pcbit_writeb(dev, GET_MSG_CMD(msg));
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pcbit_writeb(dev, GET_MSG_SCMD(msg));
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/* NUM */
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pcbit_writew(dev, frame->refnum);
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count = FRAME_HDR_LEN + PREHDR_LEN;
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} else {
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/* Type 1 frame */
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flen = 2 + (frame->skb->len - frame->copied);
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if (flen > free)
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flen = free;
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/* TT */
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tt = ((ushort) (flen - 2)) | 0x8000U; /* Type 1 */
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pcbit_writew(dev, tt);
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count = 2;
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}
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if (frame->skb) {
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cp_len = frame->skb->len - frame->copied;
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if (cp_len > flen - count)
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cp_len = flen - count;
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memcpy_topcbit(dev, frame->skb->data + frame->copied,
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cp_len);
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frame->copied += cp_len;
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}
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/* bookkeeping */
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dev->free -= flen;
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pcbit_tx_update(dev, flen);
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spin_lock_irqsave(&dev->lock, flags);
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if (frame->skb == NULL || frame->copied == frame->skb->len) {
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dev->write_queue = frame->next;
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if (frame->skb != NULL) {
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/* free frame */
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dev_kfree_skb(frame->skb);
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}
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kfree(frame);
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}
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dev->w_busy = 0;
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spin_unlock_irqrestore(&dev->lock, flags);
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} else {
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spin_unlock_irqrestore(&dev->lock, flags);
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#ifdef DEBUG
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printk(KERN_DEBUG "unacked %d free %d write_queue %s\n",
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unacked, dev->free, dev->write_queue ? "not empty" :
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"empty");
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#endif
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}
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}
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/*
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* deliver a queued frame to the upper layer
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*/
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void
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pcbit_deliver(void *data)
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{
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struct frame_buf *frame;
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unsigned long flags, msg;
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struct pcbit_dev *dev = (struct pcbit_dev *) data;
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spin_lock_irqsave(&dev->lock, flags);
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while ((frame = dev->read_queue)) {
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dev->read_queue = frame->next;
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spin_unlock_irqrestore(&dev->lock, flags);
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SET_MSG_CPU(msg, 0);
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SET_MSG_PROC(msg, 0);
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SET_MSG_CMD(msg, frame->skb->data[2]);
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SET_MSG_SCMD(msg, frame->skb->data[3]);
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frame->refnum = *((ushort *) frame->skb->data + 4);
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frame->msg = *((ulong *) & msg);
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skb_pull(frame->skb, 6);
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pcbit_l3_receive(dev, frame->msg, frame->skb, frame->hdr_len,
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frame->refnum);
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kfree(frame);
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spin_lock_irqsave(&dev->lock, flags);
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}
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spin_unlock_irqrestore(&dev->lock, flags);
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}
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/*
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* Reads BANK 2 & Reassembles
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*/
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static void
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pcbit_receive(struct pcbit_dev *dev)
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{
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unsigned short tt;
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u_char cpu,
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proc;
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struct frame_buf *frame = NULL;
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unsigned long flags;
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u_char type1;
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if (dev->l2_state != L2_RUNNING && dev->l2_state != L2_LOADING)
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return;
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tt = pcbit_readw(dev);
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if ((tt & 0x7fffU) > 511) {
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printk(KERN_INFO "pcbit: invalid frame length -> TT=%04x\n",
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tt);
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pcbit_l2_error(dev);
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return;
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}
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if (!(tt & 0x8000U)) { /* Type 0 */
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type1 = 0;
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if (dev->read_frame) {
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printk(KERN_DEBUG "pcbit_receive: Type 0 frame and read_frame != NULL\n");
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/* discard previous queued frame */
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if (dev->read_frame->skb)
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kfree_skb(dev->read_frame->skb);
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kfree(dev->read_frame);
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dev->read_frame = NULL;
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}
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frame = kmalloc(sizeof(struct frame_buf), GFP_ATOMIC);
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if (frame == NULL) {
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printk(KERN_WARNING "kmalloc failed\n");
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return;
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}
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memset(frame, 0, sizeof(struct frame_buf));
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cpu = pcbit_readb(dev);
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proc = pcbit_readb(dev);
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if (cpu != 0x06 && cpu != 0x02) {
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printk(KERN_DEBUG "pcbit: invalid cpu value\n");
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kfree(frame);
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pcbit_l2_error(dev);
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return;
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}
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/*
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* we discard cpu & proc on receiving
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* but we read it to update the pointer
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*/
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frame->hdr_len = pcbit_readw(dev);
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frame->dt_len = pcbit_readw(dev);
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/*
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* 0 sized packet
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* I don't know if they are an error or not...
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* But they are very frequent
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* Not documented
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*/
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if (frame->hdr_len == 0) {
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kfree(frame);
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#ifdef DEBUG
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printk(KERN_DEBUG "0 sized frame\n");
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#endif
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pcbit_firmware_bug(dev);
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return;
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}
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/* sanity check the length values */
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if (frame->hdr_len > 1024 || frame->dt_len > 2048) {
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#ifdef DEBUG
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printk(KERN_DEBUG "length problem: ");
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printk(KERN_DEBUG "TH=%04x TD=%04x\n",
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frame->hdr_len,
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frame->dt_len);
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#endif
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pcbit_l2_error(dev);
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kfree(frame);
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return;
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}
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/* minimum frame read */
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frame->skb = dev_alloc_skb(frame->hdr_len + frame->dt_len +
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((frame->hdr_len + 15) & ~15));
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if (!frame->skb) {
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printk(KERN_DEBUG "pcbit_receive: out of memory\n");
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kfree(frame);
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return;
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}
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/* 16 byte alignment for IP */
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if (frame->dt_len)
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skb_reserve(frame->skb, (frame->hdr_len + 15) & ~15);
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} else {
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/* Type 1 */
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type1 = 1;
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tt &= 0x7fffU;
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if (!(frame = dev->read_frame)) {
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printk("Type 1 frame and no frame queued\n");
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/* usually after an error: toss frame */
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dev->readptr += tt;
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if (dev->readptr > dev->sh_mem + BANK2 + BANKLEN)
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dev->readptr -= BANKLEN;
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return;
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}
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}
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memcpy_frompcbit(dev, skb_put(frame->skb, tt), tt);
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frame->copied += tt;
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spin_lock_irqsave(&dev->lock, flags);
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if (frame->copied == frame->hdr_len + frame->dt_len) {
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if (type1) {
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dev->read_frame = NULL;
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}
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if (dev->read_queue) {
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struct frame_buf *ptr;
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for (ptr = dev->read_queue; ptr->next; ptr = ptr->next);
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ptr->next = frame;
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} else
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dev->read_queue = frame;
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} else {
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dev->read_frame = frame;
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}
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spin_unlock_irqrestore(&dev->lock, flags);
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}
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/*
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* The board sends 0 sized frames
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* They are TDATA_CONFs that get messed up somehow
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* gotta send a fake acknowledgment to the upper layer somehow
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*/
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static __inline__ void
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pcbit_fake_conf(struct pcbit_dev *dev, struct pcbit_chan *chan)
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{
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isdn_ctrl ictl;
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if (chan->queued) {
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chan->queued--;
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ictl.driver = dev->id;
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ictl.command = ISDN_STAT_BSENT;
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ictl.arg = chan->id;
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dev->dev_if->statcallb(&ictl);
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}
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}
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static void
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pcbit_firmware_bug(struct pcbit_dev *dev)
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{
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struct pcbit_chan *chan;
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chan = dev->b1;
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if (chan->fsm_state == ST_ACTIVE) {
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pcbit_fake_conf(dev, chan);
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}
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chan = dev->b2;
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if (chan->fsm_state == ST_ACTIVE) {
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pcbit_fake_conf(dev, chan);
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}
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}
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irqreturn_t
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pcbit_irq_handler(int interrupt, void *devptr, struct pt_regs *regs)
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{
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struct pcbit_dev *dev;
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u_char info,
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ack_seq,
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read_seq;
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dev = (struct pcbit_dev *) devptr;
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if (!dev) {
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printk(KERN_WARNING "pcbit_irq_handler: wrong device\n");
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return IRQ_NONE;
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}
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if (dev->interrupt) {
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printk(KERN_DEBUG "pcbit: reentering interrupt hander\n");
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return IRQ_HANDLED;
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}
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dev->interrupt = 1;
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info = readb(dev->sh_mem + BANK3);
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if (dev->l2_state == L2_STARTING || dev->l2_state == L2_ERROR) {
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pcbit_l2_active_conf(dev, info);
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dev->interrupt = 0;
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return IRQ_HANDLED;
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}
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if (info & 0x40U) { /* E bit set */
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#ifdef DEBUG
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printk(KERN_DEBUG "pcbit_irq_handler: E bit on\n");
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#endif
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pcbit_l2_error(dev);
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dev->interrupt = 0;
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return IRQ_HANDLED;
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}
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if (dev->l2_state != L2_RUNNING && dev->l2_state != L2_LOADING) {
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dev->interrupt = 0;
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return IRQ_HANDLED;
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}
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ack_seq = (info >> 3) & 0x07U;
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read_seq = (info & 0x07U);
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dev->interrupt = 0;
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if (read_seq != dev->rcv_seq) {
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while (read_seq != dev->rcv_seq) {
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pcbit_receive(dev);
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dev->rcv_seq = (dev->rcv_seq + 1) % 8;
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}
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pcbit_sched_delivery(dev);
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}
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if (ack_seq != dev->unack_seq) {
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pcbit_recv_ack(dev, ack_seq);
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}
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info = dev->rcv_seq << 3;
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info |= dev->send_seq;
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writeb(info, dev->sh_mem + BANK4);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
static void
|
|
pcbit_l2_active_conf(struct pcbit_dev *dev, u_char info)
|
|
{
|
|
u_char state;
|
|
|
|
state = dev->l2_state;
|
|
|
|
#ifdef DEBUG
|
|
printk(KERN_DEBUG "layer2_active_confirm\n");
|
|
#endif
|
|
|
|
|
|
if (info & 0x80U) {
|
|
dev->rcv_seq = info & 0x07U;
|
|
dev->l2_state = L2_RUNNING;
|
|
} else
|
|
dev->l2_state = L2_DOWN;
|
|
|
|
if (state == L2_STARTING)
|
|
wake_up_interruptible(&dev->set_running_wq);
|
|
|
|
if (state == L2_ERROR && dev->l2_state == L2_RUNNING) {
|
|
pcbit_transmit(dev);
|
|
}
|
|
}
|
|
|
|
static void
|
|
pcbit_l2_err_recover(unsigned long data)
|
|
{
|
|
|
|
struct pcbit_dev *dev;
|
|
struct frame_buf *frame;
|
|
|
|
dev = (struct pcbit_dev *) data;
|
|
|
|
del_timer(&dev->error_recover_timer);
|
|
if (dev->w_busy || dev->r_busy) {
|
|
init_timer(&dev->error_recover_timer);
|
|
dev->error_recover_timer.expires = jiffies + ERRTIME;
|
|
add_timer(&dev->error_recover_timer);
|
|
return;
|
|
}
|
|
dev->w_busy = dev->r_busy = 1;
|
|
|
|
if (dev->read_frame) {
|
|
if (dev->read_frame->skb)
|
|
kfree_skb(dev->read_frame->skb);
|
|
kfree(dev->read_frame);
|
|
dev->read_frame = NULL;
|
|
}
|
|
if (dev->write_queue) {
|
|
frame = dev->write_queue;
|
|
#ifdef FREE_ON_ERROR
|
|
dev->write_queue = dev->write_queue->next;
|
|
|
|
if (frame->skb) {
|
|
dev_kfree_skb(frame->skb);
|
|
}
|
|
kfree(frame);
|
|
#else
|
|
frame->copied = 0;
|
|
#endif
|
|
}
|
|
dev->rcv_seq = dev->send_seq = dev->unack_seq = 0;
|
|
dev->free = 511;
|
|
dev->l2_state = L2_ERROR;
|
|
|
|
/* this is an hack... */
|
|
pcbit_firmware_bug(dev);
|
|
|
|
dev->writeptr = dev->sh_mem;
|
|
dev->readptr = dev->sh_mem + BANK2;
|
|
|
|
writeb((0x80U | ((dev->rcv_seq & 0x07) << 3) | (dev->send_seq & 0x07)),
|
|
dev->sh_mem + BANK4);
|
|
dev->w_busy = dev->r_busy = 0;
|
|
|
|
}
|
|
|
|
static void
|
|
pcbit_l2_error(struct pcbit_dev *dev)
|
|
{
|
|
if (dev->l2_state == L2_RUNNING) {
|
|
|
|
printk(KERN_INFO "pcbit: layer 2 error\n");
|
|
|
|
#ifdef DEBUG
|
|
log_state(dev);
|
|
#endif
|
|
|
|
dev->l2_state = L2_DOWN;
|
|
|
|
init_timer(&dev->error_recover_timer);
|
|
dev->error_recover_timer.function = &pcbit_l2_err_recover;
|
|
dev->error_recover_timer.data = (ulong) dev;
|
|
dev->error_recover_timer.expires = jiffies + ERRTIME;
|
|
add_timer(&dev->error_recover_timer);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Description:
|
|
* if board acks frames
|
|
* update dev->free
|
|
* call pcbit_transmit to write possible queued frames
|
|
*/
|
|
|
|
static void
|
|
pcbit_recv_ack(struct pcbit_dev *dev, unsigned char ack)
|
|
{
|
|
int i,
|
|
count;
|
|
int unacked;
|
|
|
|
unacked = (dev->send_seq + (8 - dev->unack_seq)) & 0x07;
|
|
|
|
/* dev->unack_seq < ack <= dev->send_seq; */
|
|
|
|
if (unacked) {
|
|
|
|
if (dev->send_seq > dev->unack_seq) {
|
|
if (ack <= dev->unack_seq || ack > dev->send_seq) {
|
|
printk(KERN_DEBUG
|
|
"layer 2 ack unacceptable - dev %d",
|
|
dev->id);
|
|
|
|
pcbit_l2_error(dev);
|
|
} else if (ack > dev->send_seq && ack <= dev->unack_seq) {
|
|
printk(KERN_DEBUG
|
|
"layer 2 ack unacceptable - dev %d",
|
|
dev->id);
|
|
pcbit_l2_error(dev);
|
|
}
|
|
}
|
|
/* ack is acceptable */
|
|
|
|
|
|
i = dev->unack_seq;
|
|
|
|
do {
|
|
dev->unack_seq = i = (i + 1) % 8;
|
|
dev->free += dev->fsize[i];
|
|
} while (i != ack);
|
|
|
|
count = 0;
|
|
while (count < 7 && dev->write_queue) {
|
|
u8 lsend_seq = dev->send_seq;
|
|
|
|
pcbit_transmit(dev);
|
|
|
|
if (dev->send_seq == lsend_seq)
|
|
break;
|
|
count++;
|
|
}
|
|
} else
|
|
printk(KERN_DEBUG "recv_ack: unacked = 0\n");
|
|
}
|