src/target/firmware/layer1/prim_pm.c

   1 /* Layer 1 Power Measurement */
   2
   3 /* (C) 2010 by Harald Welte <laforge@gnumonks.org>
   4  *
   5  * All Rights Reserved
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #include <stdint.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <stdlib.h>
  27
  28 #include <defines.h>
  29 #include <debug.h>
  30 #include <memory.h>
  31 #include <byteorder.h>
  32 #include <osmocom/gsm/gsm_utils.h>
  33 #include <osmocom/core/msgb.h>
  34 #include <calypso/dsp_api.h>
  35 #include <calypso/irq.h>
  36 #include <calypso/tpu.h>
  37 #include <calypso/tsp.h>
  38 #include <calypso/dsp.h>
  39 #include <calypso/timer.h>
  40 #include <comm/sercomm.h>
  41 #include <asm/system.h>
  42
  43 #include <layer1/sync.h>
  44 #include <layer1/agc.h>
  45 #include <layer1/tdma_sched.h>
  46 #include <layer1/tpu_window.h>
  47 #include <layer1/l23_api.h>
  48 #include <layer1/prim.h>
  49 #include <rffe.h>
  50
  51 #include <l1ctl_proto.h>
  52
  53 static void l1ddsp_meas_read(uint8_t nbmeas, uint16_t *pm)
  54 {
  55         uint8_t i;
  56
  57         for (i = 0; i < nbmeas; i++)
  58                 pm[i] = (uint16_t) ((dsp_api.db_r->a_pm[i] & 0xffff) >> 3);
  59         dsp_api.r_page_used = 1;
  60 }
  61
  62 /* scheduler callback to issue a power measurement task to the DSP */
  63 static int l1s_pm_cmd(uint8_t num_meas,
  64                       __unused uint8_t p2, uint16_t arfcn)
  65 {
  66         putchart('P');
  67
  68         dsp_api.db_w->d_task_md = num_meas; /* number of measurements */
  69         dsp_api.ndb->d_fb_mode = 0; /* wideband search */
  70
  71         /* Tell the RF frontend to set the gain appropriately */
  72         rffe_compute_gain(-85, CAL_DSP_TGT_BB_LVL);
  73
  74         /* Program TPU */
  75         /* FIXME: RXWIN_PW needs to set up multiple times in case
  76          * num_meas > 1 */
  77         l1s_rx_win_ctrl(arfcn, L1_RXWIN_PW, 0);
  78         //l1s_rx_win_ctrl(arfcn, L1_RXWIN_NB);
  79
  80         return 0;
  81 }
  82
  83 /* scheduler callback to read power measurement resposnse from the DSP */
  84 static int l1s_pm_resp(uint8_t num_meas, __unused uint8_t p2,
  85                        uint16_t arfcn)
  86 {
  87         struct l1ctl_pm_conf *pmr;
  88         uint16_t pm_level[2];
  89
  90         putchart('p');
  91
  92         l1ddsp_meas_read(num_meas, pm_level);
  93
  94         printf("PM MEAS: ARFCN=%u, %-4d dBm at baseband, %-4d dBm at RF\n",
  95                 arfcn, pm_level[0]/8, agc_inp_dbm8_by_pm(pm_level[0])/8);
  96
  97         printd("PM MEAS: %-4d dBm, %-4d dBm ARFCN=%u\n",
  98                 agc_inp_dbm8_by_pm(pm_level[0])/8,
  99                 agc_inp_dbm8_by_pm(pm_level[1])/8, arfcn);
 100
 101         if (!l1s.pm.msg)
 102                 l1s.pm.msg = l1ctl_msgb_alloc(L1CTL_PM_CONF);
 103
 104         if (msgb_tailroom(l1s.pm.msg) < sizeof(*pmr)) {
 105                 /* flush current msgb */
 106                 l1_queue_for_l2(l1s.pm.msg);
 107                 /* allocate a new msgb and initialize header */
 108                 l1s.pm.msg = l1ctl_msgb_alloc(L1CTL_PM_CONF);
 109         }
 110
 111         pmr = msgb_put(l1s.pm.msg, sizeof(*pmr));
 112         pmr->band_arfcn = htons(arfcn);
 113         /* FIXME: do this as RxLev rather than DBM8 ? */
 114         pmr->pm[0] = dbm2rxlev(agc_inp_dbm8_by_pm(pm_level[0])/8);
 115         if (num_meas > 1)
 116                 pmr->pm[1] = dbm2rxlev(agc_inp_dbm8_by_pm(pm_level[1])/8);
 117         else
 118                 pmr->pm[1] = 0;
 119
 120         if (l1s.pm.mode == 1) {
 121                 if (l1s.pm.range.arfcn_next <= l1s.pm.range.arfcn_end) {
 122                         /* schedule PM for next ARFCN in range */
 123                         l1s_pm_test(1, l1s.pm.range.arfcn_next);
 124                         l1s.pm.range.arfcn_next++;
 125                 } else {
 126                         /* we have finished, flush the msgb to L2 */
 127                         struct l1ctl_hdr *l1h = l1s.pm.msg->l1h;
 128                         l1h->flags |= L1CTL_F_DONE;
 129                         l1_queue_for_l2(l1s.pm.msg);
 130                         l1s.pm.msg = NULL;
 131                 }
 132         }
 133
 134         return 0;
 135 }
 136
 137 static const struct tdma_sched_item pm_sched_set[] = {
 138         SCHED_ITEM_DT(l1s_pm_cmd, 0, 1, 0),     SCHED_END_FRAME(),
 139                                                 SCHED_END_FRAME(),
 140         SCHED_ITEM(l1s_pm_resp, -4, 1, 0),      SCHED_END_FRAME(),
 141         SCHED_END_SET()
 142 };
 143
 144 /* Schedule a power measurement test */
 145 void l1s_pm_test(uint8_t base_fn, uint16_t arfcn)
 146 {
 147         unsigned long flags;
 148
 149         printd("l1s_pm_test(%u, %u)\n", base_fn, arfcn);
 150
 151         local_firq_save(flags);
 152         tdma_schedule_set(base_fn, pm_sched_set, arfcn);
 153         local_irq_restore(flags);
 154 }
 155
 156 /*
 157  * perform measurements of neighbour cells
 158  */
 159
 160 /* scheduler callback to issue a power measurement task to the DSP */
 161 static int l1s_neigh_pm_cmd(uint8_t num_meas,
 162                       __unused uint8_t p2, __unused uint16_t p3)
 163 {
 164         uint8_t last_gain = rffe_get_gain();
 165
 166         dsp_api.db_w->d_task_md = num_meas; /* number of measurements */
 167 //      dsp_api.ndb->d_fb_mode = 0; /* wideband search */
 168
 169         /* Tell the RF frontend to set the gain appropriately (keep last) */
 170         rffe_compute_gain(-85, CAL_DSP_TGT_BB_LVL);
 171
 172         /* Program TPU */
 173         /* FIXME: RXWIN_PW needs to set up multiple times in case
 174          * num_meas > 1 */
 175         /* do measurement dummy, in case l1s.neigh_pm.n == 0 */
 176         l1s_rx_win_ctrl((l1s.neigh_pm.n) ?
 177                 l1s.neigh_pm.band_arfcn[l1s.neigh_pm.pos] : 0, L1_RXWIN_PW, 0);
 178
 179         /* restore last gain */
 180         rffe_set_gain(last_gain);
 181
 182         l1s.neigh_pm.running = 1;
 183
 184         return 0;
 185 }
 186
 187 /* scheduler callback to read power measurement resposnse from the DSP */
 188 static int l1s_neigh_pm_resp(__unused uint8_t p1, __unused uint8_t p2,
 189                        __unused uint16_t p3)
 190 {
 191         uint16_t dbm;
 192         uint8_t level;
 193
 194         dsp_api.r_page_used = 1;
 195
 196         if (l1s.neigh_pm.n == 0 || !l1s.neigh_pm.running)
 197                 goto out;
 198
 199         dbm = (uint16_t) ((dsp_api.db_r->a_pm[0] & 0xffff) >> 3);
 200         level = dbm2rxlev(agc_inp_dbm8_by_pm(dbm)/8);
 201
 202         l1s.neigh_pm.level[l1s.neigh_pm.pos] = level;
 203
 204         if (++l1s.neigh_pm.pos >= l1s.neigh_pm.n) {
 205                 struct msgb *msg;
 206                 struct l1ctl_neigh_pm_ind *mi;
 207                 int i;
 208
 209                 l1s.neigh_pm.pos = 0;
 210                 /* return result */
 211                 msg = l1ctl_msgb_alloc(L1CTL_NEIGH_PM_IND);
 212                 for (i = 0; i < l1s.neigh_pm.n; i++) {
 213                         if (msgb_tailroom(msg) < (int) sizeof(*mi)) {
 214                                 l1_queue_for_l2(msg);
 215                                 msg = l1ctl_msgb_alloc(L1CTL_NEIGH_PM_IND);
 216                         }
 217                         mi = (struct l1ctl_neigh_pm_ind *)
 218                                 msgb_put(msg, sizeof(*mi));
 219                         mi->band_arfcn = htons(l1s.neigh_pm.band_arfcn[i]);
 220                         mi->pm[0] = l1s.neigh_pm.level[i];
 221                         mi->pm[1] = 0;
 222                 }
 223                 l1_queue_for_l2(msg);
 224         }
 225
 226 out:
 227         l1s.neigh_pm.running = 0;
 228
 229         return 0;
 230 }
 231
 232 const struct tdma_sched_item neigh_pm_sched_set[] = {
 233         SCHED_ITEM_DT(l1s_neigh_pm_cmd, 0, 1, 0),       SCHED_END_FRAME(),
 234                                                         SCHED_END_FRAME(),
 235         SCHED_ITEM(l1s_neigh_pm_resp, -4, 1, 0),        SCHED_END_FRAME(),
 236         SCHED_END_SET()
 237 };
 238