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-rw-r--r--src/target/firmware/layer1/l23_api.c633
1 files changed, 633 insertions, 0 deletions
diff --git a/src/target/firmware/layer1/l23_api.c b/src/target/firmware/layer1/l23_api.c
new file mode 100644
index 0000000..11f07cd
--- /dev/null
+++ b/src/target/firmware/layer1/l23_api.c
@@ -0,0 +1,633 @@
+/* Synchronous part of GSM Layer 1: API to Layer2+ */
+
+/* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#define DEBUG
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <debug.h>
+#include <byteorder.h>
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <comm/sercomm.h>
+
+#include <layer1/sync.h>
+#include <layer1/async.h>
+#include <layer1/mframe_sched.h>
+#include <layer1/prim.h>
+#include <layer1/tpu_window.h>
+
+#include <abb/twl3025.h>
+#include <rf/trf6151.h>
+
+#include <l1ctl_proto.h>
+
+/* the size we will allocate struct msgb* for HDLC */
+#define L3_MSG_HEAD 4
+#define L3_MSG_SIZE (sizeof(struct l1ctl_hdr)+sizeof(struct l1ctl_info_dl)+sizeof(struct l1ctl_traffic_ind) + L3_MSG_HEAD)
+
+void l1_queue_for_l2(struct msgb *msg)
+{
+ /* forward via serial for now */
+ sercomm_sendmsg(SC_DLCI_L1A_L23, msg);
+}
+
+enum mf_type {
+ MFNONE,
+ MF51,
+ MF26ODD,
+ MF26EVEN
+};
+static uint32_t chan_nr2mf_task_mask(uint8_t chan_nr, uint8_t neigh_mode)
+{
+ uint8_t cbits = chan_nr >> 3;
+ uint8_t tn = chan_nr & 0x7;
+ uint8_t lch_idx;
+ enum mframe_task master_task = 0;
+ uint32_t neigh_task = 0;
+ enum mf_type multiframe;
+
+ if (cbits == 0x01) {
+ lch_idx = 0;
+ master_task = (tn & 1) ? MF_TASK_TCH_F_ODD : MF_TASK_TCH_F_EVEN;
+ multiframe = (tn & 1) ? MF26ODD : MF26EVEN;
+ } else if ((cbits & 0x1e) == 0x02) {
+ lch_idx = cbits & 0x1;
+ master_task = MF_TASK_TCH_H_0 + lch_idx;
+ } else if ((cbits & 0x1c) == 0x04) {
+ lch_idx = cbits & 0x3;
+ master_task = MF_TASK_SDCCH4_0 + lch_idx;
+ multiframe = MF51;
+ } else if ((cbits & 0x18) == 0x08) {
+ lch_idx = cbits & 0x7;
+ master_task = MF_TASK_SDCCH8_0 + lch_idx;
+ multiframe = MF51;
+#if 0
+ } else if (cbits == 0x10) {
+ /* FIXME: when to do extended BCCH? */
+ master_task = MF_TASK_BCCH_NORM;
+ } else if (cbits == 0x11 || cbits == 0x12) {
+ /* FIXME: how to decide CCCH norm/extd? */
+ master_task = MF_TASK_BCCH_CCCH;
+#endif
+ }
+ switch (neigh_mode) {
+ case NEIGH_MODE_PM:
+ switch (multiframe) {
+ case MF51:
+ neigh_task = (1 << MF_TASK_NEIGH_PM51);
+ break;
+ case MF26EVEN:
+ neigh_task = (1 << MF_TASK_NEIGH_PM26E);
+ break;
+ case MF26ODD:
+ neigh_task = (1 << MF_TASK_NEIGH_PM26O);
+ break;
+ }
+ break;
+ }
+ return (1 << master_task) | neigh_task;
+}
+
+static int chan_nr2dchan_type(uint8_t chan_nr)
+{
+ uint8_t cbits = chan_nr >> 3;
+
+ if (cbits == 0x01) {
+ return GSM_DCHAN_TCH_F;
+ } else if ((cbits & 0x1e) == 0x02) {
+ return GSM_DCHAN_TCH_H;
+ } else if ((cbits & 0x1c) == 0x04) {
+ return GSM_DCHAN_SDCCH_4;
+ } else if ((cbits & 0x18) == 0x08) {
+ return GSM_DCHAN_SDCCH_8;
+ }
+ return GSM_DCHAN_UNKNOWN;
+}
+
+static int chan_nr_is_tch(uint8_t chan_nr)
+{
+ return ((chan_nr >> 3) == 0x01 || /* TCH/F */
+ ((chan_nr >> 3) & 0x1e) == 0x02); /* TCH/H */
+}
+
+static void audio_set_enabled(uint8_t tch_mode, uint8_t audio_mode)
+{
+ if (tch_mode == GSM48_CMODE_SIGN) {
+ twl3025_unit_enable(TWL3025_UNIT_VUL, 0);
+ twl3025_unit_enable(TWL3025_UNIT_VDL, 0);
+ } else {
+ twl3025_unit_enable(TWL3025_UNIT_VUL,
+ !!(audio_mode & AUDIO_TX_MICROPHONE));
+ twl3025_unit_enable(TWL3025_UNIT_VDL,
+ !!(audio_mode & AUDIO_RX_SPEAKER));
+ }
+}
+
+struct msgb *l1ctl_msgb_alloc(uint8_t msg_type)
+{
+ struct msgb *msg;
+ struct l1ctl_hdr *l1h;
+
+ msg = msgb_alloc_headroom(L3_MSG_SIZE, L3_MSG_HEAD, "l1ctl");
+ if (!msg) {
+ while (1) {
+ puts("OOPS. Out of buffers...\n");
+ }
+
+ return NULL;
+ }
+ l1h = (struct l1ctl_hdr *) msgb_put(msg, sizeof(*l1h));
+ l1h->msg_type = msg_type;
+ l1h->flags = 0;
+
+ msg->l1h = (uint8_t *)l1h;
+
+ return msg;
+}
+
+struct msgb *l1_create_l2_msg(int msg_type, uint32_t fn, uint16_t snr,
+ uint16_t arfcn)
+{
+ struct l1ctl_info_dl *dl;
+ struct msgb *msg = l1ctl_msgb_alloc(msg_type);
+
+ dl = (struct l1ctl_info_dl *) msgb_put(msg, sizeof(*dl));
+ dl->frame_nr = htonl(fn);
+ dl->snr = snr;
+ dl->band_arfcn = htons(arfcn);
+
+ return msg;
+}
+
+/* receive a L1CTL_FBSB_REQ from L23 */
+static void l1ctl_rx_fbsb_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_fbsb_req *sync_req = (struct l1ctl_fbsb_req *) l1h->data;
+
+ if (sizeof(*sync_req) > msg->len) {
+ printf("Short sync msg. %u\n", msg->len);
+ return;
+ }
+
+ printd("L1CTL_FBSB_REQ (arfcn=%u, flags=0x%x)\n",
+ ntohs(sync_req->band_arfcn), sync_req->flags);
+
+ /* reset scheduler and hardware */
+ l1s_reset();
+
+ /* pre-set the CCCH mode */
+ l1s.serving_cell.ccch_mode = sync_req->ccch_mode;
+
+ printd("Starting FCCH Recognition\n");
+ l1s_fbsb_req(1, sync_req);
+}
+
+/* receive a L1CTL_DM_EST_REQ from L23 */
+static void l1ctl_rx_dm_est_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_info_ul *ul = (struct l1ctl_info_ul *) l1h->data;
+ struct l1ctl_dm_est_req *est_req = (struct l1ctl_dm_est_req *) ul->payload;
+
+ printd("L1CTL_DM_EST_REQ (arfcn=%u, chan_nr=0x%02x, tsc=%u)\n",
+ ntohs(est_req->h0.band_arfcn), ul->chan_nr, est_req->tsc);
+
+ /* disable neighbour cell measurement */
+ mframe_disable(MF_TASK_NEIGH_PM51);
+
+ /* configure dedicated channel state */
+ l1s.dedicated.type = chan_nr2dchan_type(ul->chan_nr);
+ l1s.dedicated.tsc = est_req->tsc;
+ l1s.dedicated.tn = ul->chan_nr & 0x7;
+ l1s.dedicated.h = est_req->h;
+
+ if (est_req->h) {
+ int i;
+ l1s.dedicated.h1.hsn = est_req->h1.hsn;
+ l1s.dedicated.h1.maio = est_req->h1.maio;
+ l1s.dedicated.h1.n = est_req->h1.n;
+ for (i=0; i<est_req->h1.n; i++)
+ l1s.dedicated.h1.ma[i] = ntohs(est_req->h1.ma[i]);
+ } else {
+ l1s.dedicated.h0.arfcn = ntohs(est_req->h0.band_arfcn);
+ }
+
+ /* TCH config */
+ if (chan_nr_is_tch(ul->chan_nr)) {
+ /* Mode */
+ l1a_tch_mode_set(est_req->tch_mode);
+ l1a_audio_mode_set(est_req->audio_mode);
+
+ /* Sync */
+ l1s.tch_sync = 1; /* can be set without locking */
+
+ /* Audio path */
+ audio_set_enabled(est_req->tch_mode, est_req->audio_mode);
+ }
+
+ /* figure out which MF tasks to enable */
+ l1a_mftask_set(chan_nr2mf_task_mask(ul->chan_nr, NEIGH_MODE_PM));
+}
+
+/* receive a L1CTL_DM_FREQ_REQ from L23 */
+static void l1ctl_rx_dm_freq_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_info_ul *ul = (struct l1ctl_info_ul *) l1h->data;
+ struct l1ctl_dm_freq_req *freq_req =
+ (struct l1ctl_dm_freq_req *) ul->payload;
+
+ printd("L1CTL_DM_FREQ_REQ (arfcn=%u, tsc=%u)\n",
+ ntohs(freq_req->h0.band_arfcn), freq_req->tsc);
+
+ /* configure dedicated channel state */
+ l1s.dedicated.st_tsc = freq_req->tsc;
+ l1s.dedicated.st_h = freq_req->h;
+
+ if (freq_req->h) {
+ int i;
+ l1s.dedicated.st_h1.hsn = freq_req->h1.hsn;
+ l1s.dedicated.st_h1.maio = freq_req->h1.maio;
+ l1s.dedicated.st_h1.n = freq_req->h1.n;
+ for (i=0; i<freq_req->h1.n; i++)
+ l1s.dedicated.st_h1.ma[i] = ntohs(freq_req->h1.ma[i]);
+ } else {
+ l1s.dedicated.st_h0.arfcn = ntohs(freq_req->h0.band_arfcn);
+ }
+
+ l1a_freq_req(ntohs(freq_req->fn));
+}
+
+/* receive a L1CTL_CRYPTO_REQ from L23 */
+static void l1ctl_rx_crypto_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_info_ul *ul = (struct l1ctl_info_ul *) l1h->data;
+ struct l1ctl_crypto_req *cr = (struct l1ctl_crypto_req *) ul->payload;
+ uint8_t key_len = msg->len - sizeof(*l1h) - sizeof(*ul) - sizeof(*cr);
+
+ printd("L1CTL_CRYPTO_REQ (algo=A5/%u, len=%u)\n", cr->algo, key_len);
+
+ if (cr->algo && key_len != 8) {
+ printd("L1CTL_CRYPTO_REQ -> Invalid key\n");
+ return;
+ }
+
+ dsp_load_ciph_param(cr->algo, cr->key);
+}
+
+/* receive a L1CTL_DM_REL_REQ from L23 */
+static void l1ctl_rx_dm_rel_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_info_ul *ul = (struct l1ctl_info_ul *) l1h->data;
+
+ printd("L1CTL_DM_REL_REQ\n");
+ l1a_mftask_set(0);
+ l1s.dedicated.type = GSM_DCHAN_NONE;
+ l1a_txq_msgb_flush(&l1s.tx_queue[L1S_CHAN_MAIN]);
+ l1a_txq_msgb_flush(&l1s.tx_queue[L1S_CHAN_SACCH]);
+ l1a_txq_msgb_flush(&l1s.tx_queue[L1S_CHAN_TRAFFIC]);
+ l1a_meas_msgb_set(NULL);
+ dsp_load_ciph_param(0, NULL);
+ l1a_tch_mode_set(GSM48_CMODE_SIGN);
+ audio_set_enabled(GSM48_CMODE_SIGN, 0);
+ l1s.neigh_pm.n = 0;
+}
+
+/* receive a L1CTL_PARAM_REQ from L23 */
+static void l1ctl_rx_param_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_info_ul *ul = (struct l1ctl_info_ul *) l1h->data;
+ struct l1ctl_par_req *par_req = (struct l1ctl_par_req *) ul->payload;
+
+ printd("L1CTL_PARAM_REQ (ta=%d, tx_power=%d)\n", par_req->ta,
+ par_req->tx_power);
+
+ l1s.ta = par_req->ta;
+ l1s.tx_power = par_req->tx_power;
+}
+
+/* receive a L1CTL_RACH_REQ from L23 */
+static void l1ctl_rx_rach_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_info_ul *ul = (struct l1ctl_info_ul *) l1h->data;
+ struct l1ctl_rach_req *rach_req = (struct l1ctl_rach_req *) ul->payload;
+
+ printd("L1CTL_RACH_REQ (ra=0x%02x, offset=%d combined=%d)\n",
+ rach_req->ra, ntohs(rach_req->offset), rach_req->combined);
+
+ l1a_rach_req(ntohs(rach_req->offset), rach_req->combined,
+ rach_req->ra);
+}
+
+/* receive a L1CTL_DATA_REQ from L23 */
+static void l1ctl_rx_data_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_info_ul *ul = (struct l1ctl_info_ul *) l1h->data;
+ struct l1ctl_data_ind *data_ind = (struct l1ctl_data_ind *) ul->payload;
+ struct llist_head *tx_queue;
+
+ printd("L1CTL_DATA_REQ (link_id=0x%02x)\n", ul->link_id);
+
+ msg->l3h = data_ind->data;
+ if (ul->link_id & 0x40) {
+ struct gsm48_hdr *gh = (struct gsm48_hdr *)(data_ind->data + 5);
+ if (gh->proto_discr == GSM48_PDISC_RR
+ && gh->msg_type == GSM48_MT_RR_MEAS_REP) {
+ printd("updating measurement report\n");
+ l1a_meas_msgb_set(msg);
+ return;
+ }
+ tx_queue = &l1s.tx_queue[L1S_CHAN_SACCH];
+ } else
+ tx_queue = &l1s.tx_queue[L1S_CHAN_MAIN];
+
+ printd("ul=%p, ul->payload=%p, data_ind=%p, data_ind->data=%p l3h=%p\n",
+ ul, ul->payload, data_ind, data_ind->data, msg->l3h);
+
+ l1a_txq_msgb_enq(tx_queue, msg);
+}
+
+/* receive a L1CTL_PM_REQ from L23 */
+static void l1ctl_rx_pm_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_pm_req *pm_req = (struct l1ctl_pm_req *) l1h->data;
+
+ switch (pm_req->type) {
+ case 1:
+ l1s.pm.mode = 1;
+ l1s.pm.range.arfcn_start =
+ ntohs(pm_req->range.band_arfcn_from);
+ l1s.pm.range.arfcn_next =
+ ntohs(pm_req->range.band_arfcn_from);
+ l1s.pm.range.arfcn_end =
+ ntohs(pm_req->range.band_arfcn_to);
+ printf("L1CTL_PM_REQ start=%u end=%u\n",
+ l1s.pm.range.arfcn_start, l1s.pm.range.arfcn_end);
+ break;
+ }
+
+ l1s_pm_test(1, l1s.pm.range.arfcn_next);
+}
+
+/* Transmit a L1CTL_RESET_IND or L1CTL_RESET_CONF */
+void l1ctl_tx_reset(uint8_t msg_type, uint8_t reset_type)
+{
+ struct msgb *msg = l1ctl_msgb_alloc(msg_type);
+ struct l1ctl_reset *reset_resp;
+ reset_resp = (struct l1ctl_reset *)
+ msgb_put(msg, sizeof(*reset_resp));
+ reset_resp->type = reset_type;
+
+ l1_queue_for_l2(msg);
+}
+
+/* receive a L1CTL_RESET_REQ from L23 */
+static void l1ctl_rx_reset_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_reset *reset_req =
+ (struct l1ctl_reset *) l1h->data;
+
+ switch (reset_req->type) {
+ case L1CTL_RES_T_FULL:
+ printf("L1CTL_RESET_REQ: FULL!\n");
+ l1s_reset();
+ l1s_reset_hw();
+ audio_set_enabled(GSM48_CMODE_SIGN, 0);
+ l1ctl_tx_reset(L1CTL_RESET_CONF, reset_req->type);
+ break;
+ case L1CTL_RES_T_SCHED:
+ printf("L1CTL_RESET_REQ: SCHED!\n");
+ l1ctl_tx_reset(L1CTL_RESET_CONF, reset_req->type);
+ sched_gsmtime_reset();
+ break;
+ default:
+ printf("unknown L1CTL_RESET_REQ type\n");
+ break;
+ }
+}
+
+/* Transmit a L1CTL_CCCH_MODE_CONF */
+static void l1ctl_tx_ccch_mode_conf(uint8_t ccch_mode)
+{
+ struct msgb *msg = l1ctl_msgb_alloc(L1CTL_CCCH_MODE_CONF);
+ struct l1ctl_ccch_mode_conf *mode_conf;
+ mode_conf = (struct l1ctl_ccch_mode_conf *)
+ msgb_put(msg, sizeof(*mode_conf));
+ mode_conf->ccch_mode = ccch_mode;
+
+ l1_queue_for_l2(msg);
+}
+
+/* receive a L1CTL_CCCH_MODE_REQ from L23 */
+static void l1ctl_rx_ccch_mode_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_ccch_mode_req *ccch_mode_req =
+ (struct l1ctl_ccch_mode_req *) l1h->data;
+ uint8_t ccch_mode = ccch_mode_req->ccch_mode;
+
+ /* pre-set the CCCH mode */
+ l1s.serving_cell.ccch_mode = ccch_mode;
+
+ /* Update task */
+ mframe_disable(MF_TASK_CCCH_COMB);
+ mframe_disable(MF_TASK_CCCH);
+
+ if (ccch_mode == CCCH_MODE_COMBINED)
+ mframe_enable(MF_TASK_CCCH_COMB);
+ else if (ccch_mode == CCCH_MODE_NON_COMBINED)
+ mframe_enable(MF_TASK_CCCH);
+
+ l1ctl_tx_ccch_mode_conf(ccch_mode);
+}
+
+/* Transmit a L1CTL_TCH_MODE_CONF */
+static void l1ctl_tx_tch_mode_conf(uint8_t tch_mode, uint8_t audio_mode)
+{
+ struct msgb *msg = l1ctl_msgb_alloc(L1CTL_TCH_MODE_CONF);
+ struct l1ctl_tch_mode_conf *mode_conf;
+ mode_conf = (struct l1ctl_tch_mode_conf *)
+ msgb_put(msg, sizeof(*mode_conf));
+ mode_conf->tch_mode = tch_mode;
+ mode_conf->audio_mode = audio_mode;
+
+ l1_queue_for_l2(msg);
+}
+
+/* receive a L1CTL_TCH_MODE_REQ from L23 */
+static void l1ctl_rx_tch_mode_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_tch_mode_req *tch_mode_req =
+ (struct l1ctl_tch_mode_req *) l1h->data;
+ uint8_t tch_mode = tch_mode_req->tch_mode;
+ uint8_t audio_mode = tch_mode_req->audio_mode;
+
+ printd("L1CTL_TCH_MODE_REQ (tch_mode=0x%02x audio_mode=0x%02x)\n",
+ tch_mode, audio_mode);
+ tch_mode = l1a_tch_mode_set(tch_mode);
+ audio_mode = l1a_audio_mode_set(audio_mode);
+
+ audio_set_enabled(tch_mode, audio_mode);
+
+ l1s.tch_sync = 1; /* Needed for audio to work */
+
+ l1ctl_tx_tch_mode_conf(tch_mode, audio_mode);
+}
+
+/* receive a L1CTL_NEIGH_PM_REQ from L23 */
+static void l1ctl_rx_neigh_pm_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_neigh_pm_req *pm_req =
+ (struct l1ctl_neigh_pm_req *) l1h->data;
+ int i;
+
+ /* reset list in order to prevent race condition */
+ l1s.neigh_pm.n = 0; /* atomic */
+ l1s.neigh_pm.second = 0;
+ /* now reset pointer and fill list */
+ l1s.neigh_pm.pos = 0;
+ l1s.neigh_pm.running = 0;
+ for (i = 0; i < pm_req->n; i++)
+ l1s.neigh_pm.band_arfcn[i] = ntohs(pm_req->band_arfcn[i]);
+ printf("L1CTL_NEIGH_PM_REQ new list with %u entries\n", pm_req->n);
+ l1s.neigh_pm.n = pm_req->n; /* atomic */
+
+ /* on BCCH enable PM on frame 51 */
+ if (l1s.dedicated.type == GSM_DCHAN_NONE)
+ mframe_enable(MF_TASK_NEIGH_PM51);
+}
+
+/* receive a L1CTL_TRAFFIC_REQ from L23 */
+static void l1ctl_rx_traffic_req(struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+ struct l1ctl_info_ul *ul = (struct l1ctl_info_ul *) l1h->data;
+ struct l1ctl_traffic_req *tr = (struct l1ctl_traffic_req *) ul->payload;
+ int num = 0;
+
+ /* printd("L1CTL_TRAFFIC_REQ\n"); */ /* Very verbose, can overwelm serial */
+
+ msg->l2h = tr->data;
+
+ num = l1a_txq_msgb_count(&l1s.tx_queue[L1S_CHAN_TRAFFIC]);
+ if (num >= 4) {
+ printd("dropping traffic frame\n");
+ msgb_free(msg);
+ return;
+ }
+
+ l1a_txq_msgb_enq(&l1s.tx_queue[L1S_CHAN_TRAFFIC], msg);
+}
+
+/* callback from SERCOMM when L2 sends a message to L1 */
+static void l1a_l23_rx_cb(uint8_t dlci, struct msgb *msg)
+{
+ struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+
+#if 0
+ {
+ int i;
+ printf("l1a_l23_rx_cb (%u): ", msg->len);
+ for (i = 0; i < msg->len; i++)
+ printf("%02x ", msg->data[i]);
+ puts("\n");
+ }
+#endif
+
+ msg->l1h = msg->data;
+
+ if (sizeof(*l1h) > msg->len) {
+ printf("l1a_l23_cb: Short message. %u\n", msg->len);
+ goto exit_msgbfree;
+ }
+
+ switch (l1h->msg_type) {
+ case L1CTL_FBSB_REQ:
+ l1ctl_rx_fbsb_req(msg);
+ break;
+ case L1CTL_DM_EST_REQ:
+ l1ctl_rx_dm_est_req(msg);
+ break;
+ case L1CTL_DM_REL_REQ:
+ l1ctl_rx_dm_rel_req(msg);
+ break;
+ case L1CTL_PARAM_REQ:
+ l1ctl_rx_param_req(msg);
+ break;
+ case L1CTL_DM_FREQ_REQ:
+ l1ctl_rx_dm_freq_req(msg);
+ break;
+ case L1CTL_CRYPTO_REQ:
+ l1ctl_rx_crypto_req(msg);
+ break;
+ case L1CTL_RACH_REQ:
+ l1ctl_rx_rach_req(msg);
+ break;
+ case L1CTL_DATA_REQ:
+ l1ctl_rx_data_req(msg);
+ /* we have to keep the msgb, not free it! */
+ goto exit_nofree;
+ case L1CTL_PM_REQ:
+ l1ctl_rx_pm_req(msg);
+ break;
+ case L1CTL_RESET_REQ:
+ l1ctl_rx_reset_req(msg);
+ break;
+ case L1CTL_CCCH_MODE_REQ:
+ l1ctl_rx_ccch_mode_req(msg);
+ break;
+ case L1CTL_TCH_MODE_REQ:
+ l1ctl_rx_tch_mode_req(msg);
+ break;
+ case L1CTL_NEIGH_PM_REQ:
+ l1ctl_rx_neigh_pm_req(msg);
+ break;
+ case L1CTL_TRAFFIC_REQ:
+ l1ctl_rx_traffic_req(msg);
+ /* we have to keep the msgb, not free it! */
+ goto exit_nofree;
+ }
+
+exit_msgbfree:
+ msgb_free(msg);
+exit_nofree:
+ return;
+}
+
+void l1a_l23api_init(void)
+{
+ sercomm_register_rx_cb(SC_DLCI_L1A_L23, l1a_l23_rx_cb);
+}