dev: driver for AD9520 clock distribution chip

67fbaabd · Tomasz Wlostowski · f988d95c · 67fbaabd · 67fbaabd · 67fbaabd
Commit 67fbaabd authored Mar 19, 2020 by Tomasz Wlostowski
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ad9520.c dev/ad9520.c +114 -0

dev.mk dev/dev.mk +2 -1

ad9520.h include/dev/ad9520.h +42 -0

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--- a/dev/ad9520.c
+++ b/dev/ad9520.c
+/*
+ * This work is part of the White Rabbit project
+ *
+ * Copyright (C) 2019 CERN (www.cern.ch)
+ * Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "dev/ad9520.h"
+#include "dev/i2c.h"
+
+
+// Write to AD9510 via I2C
+void ad9520_write(struct ad9520_device *dev, uint32_t reg, uint8_t value)
+{
+//    pp_printf("ad9520_write reg %x value %x\n", reg, value);
+    bb_i2c_start( dev->bus );
+    bb_i2c_put_byte( dev->bus, dev->addr << 1 );
+    bb_i2c_put_byte( dev->bus, reg >> 8);
+    bb_i2c_put_byte( dev->bus, reg & 0xff);
+    bb_i2c_put_byte( dev->bus, value );
+    bb_i2c_stop( dev->bus );
+}
+
+// Read from AD9510 via I2C
+uint8_t ad9520_read(struct ad9520_device *dev, uint32_t reg) {
+    uint8_t rv;
+    bb_i2c_start( dev->bus );
+    int ack = bb_i2c_put_byte( dev->bus, dev->addr << 1 );
+    bb_i2c_put_byte( dev->bus, reg >> 8);
+    bb_i2c_put_byte( dev->bus, reg & 0xff);
+    bb_i2c_repeat_start( dev->bus );
+    bb_i2c_put_byte( dev->bus, (dev->addr << 1) | 1 );
+    bb_i2c_get_byte( dev->bus, &rv, 1);
+    bb_i2c_stop( dev->bus );
+    return rv;
+}
+
+
+int ad9520_init(struct ad9520_device *dev, struct i2c_bus *bus, uint8_t addr)
+{
+    dev->bus = bus;
+    dev->addr = addr;
+
+    ad9520_write( dev, 0x00, (1<<5) | (1<<2) );  // soft reset
+    ad9520_write( dev, 0x232, 0x01);  // commit
+
+    int id = ad9520_read( dev, 0x3 );
+    pp_printf("Init AD9520: ID = %x\n", id);
+    return (id == 0x61 ? 0 : -1);
+}
+
+int ad9520_configure(struct ad9520_device *dev, struct ad95xx_config *cfg) 
+{
+    int i;
+    for(i = 0; i < cfg->n_regs; i++) {
+        ad9520_write(dev, cfg->regs[i].addr, cfg->regs[i].value);
+    }
+
+    ad9520_write(dev, 0x232, 0x01);  // commit
+/*
+    for(i = 0; i < cfg->n_regs; i++) {
+       uint32_t r = ad9520_read(dev, cfg->regs[i].addr);
+       pp_printf("readback %x %x %x\n" , cfg->regs[i].addr , cfg->regs[i].value, r);
+    }
+*/
+
+    return 0;
+};
+
+int ad9520_enable_output(struct ad9520_device *dev, int channel, int enabled )
+{
+    uint32_t val = enabled ? 0x64 : 0x65; // LVPECL
+    ad9520_write(dev, 0xf0 + channel, val);
+    ad9520_write(dev, 0x232, 0x01);  // commit
+    return 0;
+}
+
+int ad9520_set_output_divider( struct ad9520_device *dev, int channel, int divider)
+{
+    int index = channel / 3;
+    if( divider == 1 ) // undivided output
+    {
+        ad9520_write(dev, 0x190 + 3*index, 0);
+        ad9520_write(dev, 0x191 + 3*index, 0x80); // bypass divider, ignore ysnc
+        ad9520_write(dev, 0x192 + 3*index, 0);
+    } else {
+        int cyc = (divider / 2) - 1;
+
+        if( cyc >= 8)
+            return -1;
+
+        ad9520_write(dev, 0x190 + 3*index, cyc | (cyc<<4));
+        ad9520_write(dev, 0x191 + 3*index, 0x00); // enable divider, ignore ysnc
+        ad9520_write(dev, 0x192 + 3*index, 0);
+    }
+
+    ad9520_write(dev, 0x232, 0x01);  // commit
+    return 0;
+}
+
+
--- a/dev/dev.mk
+++ b/dev/dev.mk
@@ -24,7 +24,8 @@ obj-$(CONFIG_EMBEDDED_NODE) += \
 	dev/spi_flash.o \
 	dev/clock_monitor.o \
 	dev/iuart.o \
-	dev/ltc6950.o
+	dev/ltc6950.o \
+	dev/ad9520.o

 obj-$(CONFIG_WR_NODE) += \
 	dev/temperature.o \

--- a/include/dev/ad9520.h
+++ b/include/dev/ad9520.h
+/*
+ * This work is part of the White Rabbit project
+ *
+ * Copyright (C) 2019 CERN (www.cern.ch)
+ * Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __AD9520_H
+#define __AD9520_H
+
+#include "board.h"
+#include "dev/i2c.h"
+#include "dev/ad951x.h"
+
+#define AD9510_BIT_DELAY 100
+
+
+struct ad9520_device {
+    struct i2c_bus *bus;
+    uint8_t addr;
+};
+
+void ad9520_write(struct ad9520_device *dev, uint32_t reg, uint8_t value);
+uint8_t ad9520_read(struct ad9520_device *dev, uint32_t reg);
+void ad9520_soft_reset(struct ad9520_device *dev);
+int ad9520_init(struct ad9520_device *dev, struct i2c_bus *bus, uint8_t addr);
+int ad9520_configure(struct ad9520_device *dev, struct ad95xx_config *cfg);
+
+#endif