From 7d705122445aa27597de8a863051a7844014664b Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Tue, 27 Sep 2011 13:11:41 -0700
Subject: e100: added support for r4 differential clocking

---
 host/lib/usrp/e100/clock_ctrl.cpp | 37 ++++++++++++++++++++++++++-----------
 host/lib/usrp/e100/clock_ctrl.hpp |  3 ++-
 host/lib/usrp/e100/e100_impl.cpp  |  9 ++++++++-
 3 files changed, 36 insertions(+), 13 deletions(-)

(limited to 'host/lib/usrp/e100')

diff --git a/host/lib/usrp/e100/clock_ctrl.cpp b/host/lib/usrp/e100/clock_ctrl.cpp
index 6acb13528..0eb9eef8e 100644
--- a/host/lib/usrp/e100/clock_ctrl.cpp
+++ b/host/lib/usrp/e100/clock_ctrl.cpp
@@ -167,7 +167,9 @@ static clock_settings_type get_clock_settings(double rate){
  **********************************************************************/
 class e100_clock_ctrl_impl : public e100_clock_ctrl{
 public:
-    e100_clock_ctrl_impl(spi_iface::sptr iface, double master_clock_rate){
+    e100_clock_ctrl_impl(spi_iface::sptr iface, double master_clock_rate, const bool dboard_clocks_diff):
+        _dboard_clocks_diff(dboard_clocks_diff)
+    {
         _iface = iface;
         _chan_rate = 0.0;
         _out_rate = 0.0;
@@ -319,10 +321,16 @@ public:
      * RX Dboard Clock Control (output 9, divider 3)
      **********************************************************************/
     void enable_rx_dboard_clock(bool enb){
-        _ad9522_regs.out9_format = ad9522_regs_t::OUT9_FORMAT_CMOS;
-        _ad9522_regs.out9_cmos_configuration = (enb)?
-            ad9522_regs_t::OUT9_CMOS_CONFIGURATION_B_ON :
-            ad9522_regs_t::OUT9_CMOS_CONFIGURATION_OFF;
+        if (_dboard_clocks_diff){
+            _ad9522_regs.out9_format = ad9522_regs_t::OUT9_FORMAT_LVDS;
+            _ad9522_regs.out9_lvds_power_down = enb? 0 : 1;
+        }
+        else{
+            _ad9522_regs.out9_format = ad9522_regs_t::OUT9_FORMAT_CMOS;
+            _ad9522_regs.out9_cmos_configuration = (enb)?
+                ad9522_regs_t::OUT9_CMOS_CONFIGURATION_B_ON :
+                ad9522_regs_t::OUT9_CMOS_CONFIGURATION_OFF;
+        }
         this->send_reg(0x0F9);
         this->latch_regs();
     }
@@ -357,10 +365,16 @@ public:
      * TX Dboard Clock Control (output 6, divider 2)
      **********************************************************************/
     void enable_tx_dboard_clock(bool enb){
-        _ad9522_regs.out6_format = ad9522_regs_t::OUT6_FORMAT_CMOS;
-        _ad9522_regs.out6_cmos_configuration = (enb)?
-            ad9522_regs_t::OUT6_CMOS_CONFIGURATION_B_ON :
-            ad9522_regs_t::OUT6_CMOS_CONFIGURATION_OFF;
+        if (_dboard_clocks_diff){
+            _ad9522_regs.out6_format = ad9522_regs_t::OUT6_FORMAT_LVDS;
+            _ad9522_regs.out6_lvds_power_down = enb? 0 : 1;
+        }
+        else{
+            _ad9522_regs.out6_format = ad9522_regs_t::OUT6_FORMAT_CMOS;
+            _ad9522_regs.out6_cmos_configuration = (enb)?
+                ad9522_regs_t::OUT6_CMOS_CONFIGURATION_B_ON :
+                ad9522_regs_t::OUT6_CMOS_CONFIGURATION_OFF;
+        }
         this->send_reg(0x0F6);
         this->latch_regs();
     }
@@ -420,6 +434,7 @@ public:
 
 private:
     spi_iface::sptr _iface;
+    const bool _dboard_clocks_diff;
     ad9522_regs_t _ad9522_regs;
     double _out_rate; //rate at the fpga and codec
     double _chan_rate; //rate before final dividers
@@ -505,6 +520,6 @@ private:
 /***********************************************************************
  * Clock Control Make
  **********************************************************************/
-e100_clock_ctrl::sptr e100_clock_ctrl::make(spi_iface::sptr iface, double master_clock_rate){
-    return sptr(new e100_clock_ctrl_impl(iface, master_clock_rate));
+e100_clock_ctrl::sptr e100_clock_ctrl::make(spi_iface::sptr iface, double master_clock_rate, const bool dboard_clocks_diff){
+    return sptr(new e100_clock_ctrl_impl(iface, master_clock_rate, dboard_clocks_diff));
 }
diff --git a/host/lib/usrp/e100/clock_ctrl.hpp b/host/lib/usrp/e100/clock_ctrl.hpp
index 7c16649d3..538ea65d8 100644
--- a/host/lib/usrp/e100/clock_ctrl.hpp
+++ b/host/lib/usrp/e100/clock_ctrl.hpp
@@ -36,9 +36,10 @@ public:
      * Make a new clock control object.
      * \param iface the spi iface object
      * \param master clock rate the FPGA rate
+     * param dboard_clocks_diff are they differential?
      * \return the clock control object
      */
-    static sptr make(uhd::spi_iface::sptr iface, double master_clock_rate);
+    static sptr make(uhd::spi_iface::sptr iface, double master_clock_rate, const bool dboard_clocks_diff);
 
     /*!
      * Set the rate of the fpga clock line.
diff --git a/host/lib/usrp/e100/e100_impl.cpp b/host/lib/usrp/e100/e100_impl.cpp
index 5c7ff04fd..b80ee0836 100644
--- a/host/lib/usrp/e100/e100_impl.cpp
+++ b/host/lib/usrp/e100/e100_impl.cpp
@@ -139,9 +139,16 @@ e100_impl::e100_impl(const uhd::device_addr_t &device_addr){
     }
 
     //setup clock control here to ensure that the FPGA has a good clock before we continue
+    bool dboard_clocks_diff = true;
+    if      (mb_eeprom.get("revision", "0") == "3") dboard_clocks_diff = false;
+    else if (mb_eeprom.get("revision", "0") == "4") dboard_clocks_diff = true;
+    else UHD_MSG(warning)
+        << "Unknown E1XX revision number!\n"
+        << "defaulting to differential dboard clocks to be safe.\n"
+        << std::endl;
     const double master_clock_rate = device_addr.cast<double>("master_clock_rate", E100_DEFAULT_CLOCK_RATE);
     _aux_spi_iface = e100_ctrl::make_aux_spi_iface();
-    _clock_ctrl = e100_clock_ctrl::make(_aux_spi_iface, master_clock_rate);
+    _clock_ctrl = e100_clock_ctrl::make(_aux_spi_iface, master_clock_rate, dboard_clocks_diff);
 
     //Perform wishbone readback tests, these tests also write the hash
     bool test_fail = false;
-- 
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