1 /* $Id: hysdn_sched.c,v 1.5.6.4 2001/11/06 21:58:19 kai Exp $
2 *
3 * Linux driver for HYSDN cards
4 * scheduler routines for handling exchange card <-> pc.
5 *
6 * Author Werner Cornelius (werner@titro.de) for Hypercope GmbH
7 * Copyright 1999 by Werner Cornelius (werner@titro.de)
8 *
9 * This software may be used and distributed according to the terms
10 * of the GNU General Public License, incorporated herein by reference.
11 *
12 */
13
14 #include <linux/signal.h>
15 #include <linux/kernel.h>
16 #include <linux/ioport.h>
17 #include <linux/interrupt.h>
18 #include <linux/delay.h>
19 #include <asm/io.h>
20
21 #include "hysdn_defs.h"
22
23 /*****************************************************************************/
24 /* hysdn_sched_rx is called from the cards handler to announce new data is */
25 /* available from the card. The routine has to handle the data and return */
26 /* with a nonzero code if the data could be worked (or even thrown away), if */
27 /* no room to buffer the data is available a zero return tells the card */
28 /* to keep the data until later. */
29 /*****************************************************************************/
30 int
31 hysdn_sched_rx(hysdn_card *card, unsigned char *buf, unsigned short len,
32 unsigned short chan)
33 {
34
35 switch (chan) {
36 case CHAN_NDIS_DATA:
37 if (hynet_enable & (1 << card->myid)) {
38 /* give packet to network handler */
39 hysdn_rx_netpkt(card, buf, len);
40 }
41 break;
42
43 case CHAN_ERRLOG:
44 hysdn_card_errlog(card, (tErrLogEntry *) buf, len);
45 if (card->err_log_state == ERRLOG_STATE_ON)
46 card->err_log_state = ERRLOG_STATE_START; /* start new fetch */
47 break;
48 #ifdef CONFIG_HYSDN_CAPI
49 case CHAN_CAPI:
50 /* give packet to CAPI handler */
51 if (hycapi_enable & (1 << card->myid)) {
52 hycapi_rx_capipkt(card, buf, len);
53 }
54 break;
55 #endif /* CONFIG_HYSDN_CAPI */
56 default:
57 printk(KERN_INFO "irq message channel %d len %d unhandled \n", chan, len);
58 break;
59
60 } /* switch rx channel */
61
62 return (1); /* always handled */
63 } /* hysdn_sched_rx */
64
65 /*****************************************************************************/
66 /* hysdn_sched_tx is called from the cards handler to announce that there is */
67 /* room in the tx-buffer to the card and data may be sent if needed. */
68 /* If the routine wants to send data it must fill buf, len and chan with the */
69 /* appropriate data and return a nonzero value. With a zero return no new */
70 /* data to send is assumed. maxlen specifies the buffer size available for */
71 /* sending. */
72 /*****************************************************************************/
73 int
74 hysdn_sched_tx(hysdn_card *card, unsigned char *buf,
75 unsigned short volatile *len, unsigned short volatile *chan,
76 unsigned short maxlen)
77 {
78 struct sk_buff *skb;
79
80 if (card->net_tx_busy) {
81 card->net_tx_busy = 0; /* reset flag */
82 hysdn_tx_netack(card); /* acknowledge packet send */
83 } /* a network packet has completely been transferred */
84 /* first of all async requests are handled */
85 if (card->async_busy) {
86 if (card->async_len <= maxlen) {
87 memcpy(buf, card->async_data, card->async_len);
88 *len = card->async_len;
89 *chan = card->async_channel;
90 card->async_busy = 0; /* reset request */
91 return (1);
92 }
93 card->async_busy = 0; /* in case of length error */
94 } /* async request */
95 if ((card->err_log_state == ERRLOG_STATE_START) &&
96 (maxlen >= ERRLOG_CMD_REQ_SIZE)) {
97 strcpy(buf, ERRLOG_CMD_REQ); /* copy the command */
98 *len = ERRLOG_CMD_REQ_SIZE; /* buffer length */
99 *chan = CHAN_ERRLOG; /* and channel */
100 card->err_log_state = ERRLOG_STATE_ON; /* new state is on */
101 return (1); /* tell that data should be send */
102 } /* error log start and able to send */
103 if ((card->err_log_state == ERRLOG_STATE_STOP) &&
104 (maxlen >= ERRLOG_CMD_STOP_SIZE)) {
105 strcpy(buf, ERRLOG_CMD_STOP); /* copy the command */
106 *len = ERRLOG_CMD_STOP_SIZE; /* buffer length */
107 *chan = CHAN_ERRLOG; /* and channel */
108 card->err_log_state = ERRLOG_STATE_OFF; /* new state is off */
109 return (1); /* tell that data should be send */
110 } /* error log start and able to send */
111 /* now handle network interface packets */
112 if ((hynet_enable & (1 << card->myid)) &&
113 (skb = hysdn_tx_netget(card)) != NULL)
114 {
115 if (skb->len <= maxlen) {
116 /* copy the packet to the buffer */
117 skb_copy_from_linear_data(skb, buf, skb->len);
118 *len = skb->len;
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 */
122 } else
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))
128 {
129 if (skb->len <= maxlen) {
130 skb_copy_from_linear_data(skb, buf, skb->len);
131 *len = skb->len;
132 *chan = CHAN_CAPI;
133 hycapi_tx_capiack(card);
134 return (1); /* go and send the data */
135 }
136 }
137 #endif /* CONFIG_HYSDN_CAPI */
138 return (0); /* nothing to send */
139 } /* hysdn_sched_tx */
140
141
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 because only some lines */
147 /* are to be sent and this happens very seldom. */
148 /*****************************************************************************/
149 int
150 hysdn_tx_cfgline(hysdn_card *card, unsigned char *line, unsigned short chan)
151 {
152 int cnt = 50; /* timeout intervalls */
153 unsigned long flags;
154
155 if (card->debug_flags & LOG_SCHED_ASYN)
156 hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1);
157
158 while (card->async_busy) {
159
160 if (card->debug_flags & LOG_SCHED_ASYN)
161 hysdn_addlog(card, "async tx-cfg delayed");
162
163 msleep_interruptible(20); /* Timeout 20ms */
164 if (!--cnt)
165 return (-ERR_ASYNC_TIME); /* timed out */
166 } /* wait for buffer to become free */
167
168 spin_lock_irqsave(&card->hysdn_lock, flags);
169 strcpy(card->async_data, line);
170 card->async_len = strlen(line) + 1;
171 card->async_channel = chan;
172 card->async_busy = 1; /* request transfer */
173
174 /* now queue the task */
175 schedule_work(&card->irq_queue);
176 spin_unlock_irqrestore(&card->hysdn_lock, flags);
177
178 if (card->debug_flags & LOG_SCHED_ASYN)
179 hysdn_addlog(card, "async tx-cfg data queued");
180
181 cnt++; /* short delay */
182
183 while (card->async_busy) {
184
185 if (card->debug_flags & LOG_SCHED_ASYN)
186 hysdn_addlog(card, "async tx-cfg waiting for tx-ready");
187
188 msleep_interruptible(20); /* Timeout 20ms */
189 if (!--cnt)
190 return (-ERR_ASYNC_TIME); /* timed out */
191 } /* wait for buffer to become free again */
192
193 if (card->debug_flags & LOG_SCHED_ASYN)
194 hysdn_addlog(card, "async tx-cfg data send");
195
196 return (0); /* line send correctly */
197 } /* hysdn_tx_cfgline */