1 /* $Id: hysdn_sched.c,v 1.5.6.4 2001/11/06 21:58:19 kai Exp $
3 * Linux driver for HYSDN cards
4 * scheduler routines for handling exchange card <-> pc.
6 * Author Werner Cornelius (werner@titro.de) for Hypercope GmbH
7 * Copyright 1999 by Werner Cornelius (werner@titro.de)
9 * This software may be used and distributed according to the terms
10 * of the GNU General Public License, incorporated herein by reference.
14 #include <linux/sched.h>
15 #include <linux/signal.h>
16 #include <linux/kernel.h>
17 #include <linux/ioport.h>
18 #include <linux/interrupt.h>
19 #include <linux/delay.h>
22 #include "hysdn_defs.h"
24 /*****************************************************************************/
25 /* hysdn_sched_rx is called from the cards handler to announce new data is */
26 /* available from the card. The routine has to handle the data and return */
27 /* with a nonzero code if the data could be worked (or even thrown away), if */
28 /* no room to buffer the data is available a zero return tells the card */
29 /* to keep the data until later. */
30 /*****************************************************************************/
32 hysdn_sched_rx(hysdn_card *card, unsigned char *buf, unsigned short len,
38 if (hynet_enable & (1 << card->myid)) {
39 /* give packet to network handler */
40 hysdn_rx_netpkt(card, buf, len);
45 hysdn_card_errlog(card, (tErrLogEntry *) buf, len);
46 if (card->err_log_state == ERRLOG_STATE_ON)
47 card->err_log_state = ERRLOG_STATE_START; /* start new fetch */
49 #ifdef CONFIG_HYSDN_CAPI
51 /* give packet to CAPI handler */
52 if (hycapi_enable & (1 << card->myid)) {
53 hycapi_rx_capipkt(card, buf, len);
56 #endif /* CONFIG_HYSDN_CAPI */
58 printk(KERN_INFO "irq message channel %d len %d unhandled \n", chan, len);
61 } /* switch rx channel */
63 return (1); /* always handled */
64 } /* hysdn_sched_rx */
66 /*****************************************************************************/
67 /* hysdn_sched_tx is called from the cards handler to announce that there is */
68 /* room in the tx-buffer to the card and data may be sent if needed. */
69 /* If the routine wants to send data it must fill buf, len and chan with the */
70 /* appropriate data and return a nonzero value. With a zero return no new */
71 /* data to send is assumed. maxlen specifies the buffer size available for */
73 /*****************************************************************************/
75 hysdn_sched_tx(hysdn_card *card, unsigned char *buf,
76 unsigned short volatile *len, unsigned short volatile *chan,
77 unsigned short maxlen)
81 if (card->net_tx_busy) {
82 card->net_tx_busy = 0; /* reset flag */
83 hysdn_tx_netack(card); /* acknowledge packet send */
84 } /* a network packet has completely been transferred */
85 /* first of all async requests are handled */
86 if (card->async_busy) {
87 if (card->async_len <= maxlen) {
88 memcpy(buf, card->async_data, card->async_len);
89 *len = card->async_len;
90 *chan = card->async_channel;
91 card->async_busy = 0; /* reset request */
94 card->async_busy = 0; /* in case of length error */
96 if ((card->err_log_state == ERRLOG_STATE_START) &&
97 (maxlen >= ERRLOG_CMD_REQ_SIZE)) {
98 strcpy(buf, ERRLOG_CMD_REQ); /* copy the command */
99 *len = ERRLOG_CMD_REQ_SIZE; /* buffer length */
100 *chan = CHAN_ERRLOG; /* and channel */
101 card->err_log_state = ERRLOG_STATE_ON; /* new state is on */
102 return (1); /* tell that data should be send */
103 } /* error log start and able to send */
104 if ((card->err_log_state == ERRLOG_STATE_STOP) &&
105 (maxlen >= ERRLOG_CMD_STOP_SIZE)) {
106 strcpy(buf, ERRLOG_CMD_STOP); /* copy the command */
107 *len = ERRLOG_CMD_STOP_SIZE; /* buffer length */
108 *chan = CHAN_ERRLOG; /* and channel */
109 card->err_log_state = ERRLOG_STATE_OFF; /* new state is off */
110 return (1); /* tell that data should be send */
111 } /* error log start and able to send */
112 /* now handle network interface packets */
113 if ((hynet_enable & (1 << card->myid)) &&
114 (skb = hysdn_tx_netget(card)) != NULL)
116 if (skb->len <= maxlen) {
117 memcpy(buf, skb->data, skb->len); /* copy the packet to the buffer */
119 *chan = CHAN_NDIS_DATA;
120 card->net_tx_busy = 1; /* we are busy sending network data */
121 return (1); /* go and send the data */
123 hysdn_tx_netack(card); /* aknowledge packet -> throw away */
124 } /* send a network packet if available */
125 #ifdef CONFIG_HYSDN_CAPI
126 if( ((hycapi_enable & (1 << card->myid))) &&
127 ((skb = hycapi_tx_capiget(card)) != NULL) )
129 if (skb->len <= maxlen) {
130 memcpy(buf, skb->data, skb->len);
133 hycapi_tx_capiack(card);
134 return (1); /* go and send the data */
137 #endif /* CONFIG_HYSDN_CAPI */
138 return (0); /* nothing to send */
139 } /* hysdn_sched_tx */
142 /*****************************************************************************/
143 /* send one config line to the card and return 0 if successful, otherwise a */
144 /* negative error code. */
145 /* The function works with timeouts perhaps not giving the greatest speed */
146 /* sending the line, but this should be meaningless beacuse only some lines */
147 /* are to be sent and this happens very seldom. */
148 /*****************************************************************************/
150 hysdn_tx_cfgline(hysdn_card *card, unsigned char *line, unsigned short chan)
152 int cnt = 50; /* timeout intervalls */
155 if (card->debug_flags & LOG_SCHED_ASYN)
156 hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1);
160 while (card->async_busy) {
163 if (card->debug_flags & LOG_SCHED_ASYN)
164 hysdn_addlog(card, "async tx-cfg delayed");
166 msleep_interruptible(20); /* Timeout 20ms */
168 restore_flags(flags);
169 return (-ERR_ASYNC_TIME); /* timed out */
172 } /* wait for buffer to become free */
174 strcpy(card->async_data, line);
175 card->async_len = strlen(line) + 1;
176 card->async_channel = chan;
177 card->async_busy = 1; /* request transfer */
179 /* now queue the task */
180 schedule_work(&card->irq_queue);
183 if (card->debug_flags & LOG_SCHED_ASYN)
184 hysdn_addlog(card, "async tx-cfg data queued");
186 cnt++; /* short delay */
189 while (card->async_busy) {
192 if (card->debug_flags & LOG_SCHED_ASYN)
193 hysdn_addlog(card, "async tx-cfg waiting for tx-ready");
195 msleep_interruptible(20); /* Timeout 20ms */
197 restore_flags(flags);
198 return (-ERR_ASYNC_TIME); /* timed out */
201 } /* wait for buffer to become free again */
203 restore_flags(flags);
205 if (card->debug_flags & LOG_SCHED_ASYN)
206 hysdn_addlog(card, "async tx-cfg data send");
208 return (0); /* line send correctly */
209 } /* hysdn_tx_cfgline */