From b469e7314860794aebd904ebc4a63f877c01c3fc Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Fri, 4 Oct 2013 19:45:19 +0200
Subject: Use GPS as default clock source on sysmoBTS 2050

---
 src/osmo-bts-sysmo/Makefile.am |  2 +-
 src/osmo-bts-sysmo/l1_if.c     | 37 +++++++++++++++++++++++++++++++++++--
 src/osmo-bts-sysmo/l1_if.h     |  5 +++++
 3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/src/osmo-bts-sysmo/Makefile.am b/src/osmo-bts-sysmo/Makefile.am
index 908a5b6..1fe17ee 100644
--- a/src/osmo-bts-sysmo/Makefile.am
+++ b/src/osmo-bts-sysmo/Makefile.am
@@ -9,7 +9,7 @@ EXTRA_DIST = misc/sysmobts_mgr.h misc/sysmobts_misc.h misc/sysmobts_par.h \
 bin_PROGRAMS = sysmobts sysmobts-remote l1fwd-proxy sysmobts-mgr sysmobts-util
 
 COMMON_SOURCES = main.c femtobts.c l1_if.c oml.c sysmobts_vty.c tch.c hw_misc.c calib_file.c \
-		 eeprom.c calib_fixup.c utils.c
+		 eeprom.c calib_fixup.c utils.c misc/sysmobts_par.c
 
 sysmobts_SOURCES = $(COMMON_SOURCES) l1_transp_hw.c
 sysmobts_LDADD = $(top_builddir)/src/common/libbts.a $(LDADD)
diff --git a/src/osmo-bts-sysmo/l1_if.c b/src/osmo-bts-sysmo/l1_if.c
index e16bb49..0af1014 100644
--- a/src/osmo-bts-sysmo/l1_if.c
+++ b/src/osmo-bts-sysmo/l1_if.c
@@ -57,6 +57,7 @@
 #include "l1_if.h"
 #include "l1_transp.h"
 #include "hw_misc.h"
+#include "misc/sysmobts_par.h"
 
 extern int pcu_direct;
 
@@ -1243,6 +1244,29 @@ int l1if_pdch_req(struct gsm_bts_trx_ts *ts, int is_ptcch, uint32_t fn,
 	return 0;
 }
 
+/* get those femtol1_hdl.hw_info elements that sre in EEPROM */
+static int get_hwinfo_eeprom(struct femtol1_hdl *fl1h)
+{
+	int val, rc;
+
+	rc = sysmobts_par_get_int(SYSMOBTS_PAR_MODEL_NR, &val);
+	if (rc < 0)
+		return rc;
+	fl1h->hw_info.model_nr = val;
+
+	rc = sysmobts_par_get_int(SYSMOBTS_PAR_MODEL_FLAGS, &val);
+	if (rc < 0)
+		return rc;
+	fl1h->hw_info.model_flags = val;
+
+	rc = sysmobts_par_get_int(SYSMOBTS_PAR_TRX_NR, &val);
+	if (rc < 0)
+		return rc;
+	fl1h->hw_info.trx_nr = val;
+
+	return 0;
+}
+
 struct femtol1_hdl *l1if_open(void *priv)
 {
 	struct femtol1_hdl *fl1h;
@@ -1271,9 +1295,18 @@ struct femtol1_hdl *l1if_open(void *priv)
 	fl1h->ul_power_target = -75;	/* dBm default */
 	fl1h->min_qual_rach = MIN_QUAL_RACH;
 	fl1h->min_qual_norm = MIN_QUAL_NORM;
-	/* default clock source: OCXO */
+	get_hwinfo_eeprom(fl1h);
 #if SUPERFEMTO_API_VERSION >= SUPERFEMTO_API(2,1,0)
-	fl1h->clk_src = SuperFemto_ClkSrcId_Ocxo;
+	if (fl1h->hw_info.model_nr == 2050) {
+		/* On the sysmoBTS 2050, we don't have an OCXO but
+		 * always slave our clock to the GPS receiver */
+		fl1h->clk_src = SuperFemto_ClkSrcId_GpsPps;
+		LOGP(DL1C, LOGL_INFO, "Clock source defaulting to GPS 1PPS "
+			"on sysmoBTS 2050\n");
+	} else {
+		/* default clock source: OCXO */
+		fl1h->clk_src = SuperFemto_ClkSrcId_Ocxo;
+	}
 #else
 	fl1h->clk_src = SF_CLKSRC_OCXO;
 #endif
diff --git a/src/osmo-bts-sysmo/l1_if.h b/src/osmo-bts-sysmo/l1_if.h
index cf8af7b..8d63569 100644
--- a/src/osmo-bts-sysmo/l1_if.h
+++ b/src/osmo-bts-sysmo/l1_if.h
@@ -63,9 +63,14 @@ struct femtol1_hdl {
 	struct osmo_wqueue write_q[_NUM_MQ_WRITE];
 
 	struct {
+		/* from DSP/FPGA after L1 Init */
 		uint8_t dsp_version[3];
 		uint8_t fpga_version[3];
 		uint32_t band_support;	/* bitmask of GSM_BAND_* */
+		/* from EEPROM */
+		uint16_t model_nr;
+		uint16_t model_flags;
+		uint8_t trx_nr;
 	} hw_info;
 
 	int fixup_needed;
-- 
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