From ba088614d85433094b6089d22dbf8bcef211b7f6 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Wed, 23 Jul 2014 11:49:48 -0600
Subject: [PATCH] runtime: add dds_program

---
 artiq/devices/runtime.py |  1 +
 soc/runtime/main.c       | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/artiq/devices/runtime.py b/artiq/devices/runtime.py
index 9aee65d54..c1f19efb4 100644
--- a/artiq/devices/runtime.py
+++ b/artiq/devices/runtime.py
@@ -8,6 +8,7 @@ _syscalls = [
 	("gpio_set",	"ii:v"),
 	("rtio_set",	"iii:v"),
 	("rtio_sync",	"i:v"),
+	("dds_program",	"ii:v"),
 ]
 
 def _str_to_functype(s):
diff --git a/soc/runtime/main.c b/soc/runtime/main.c
index fe046fe88..1974fe224 100644
--- a/soc/runtime/main.c
+++ b/soc/runtime/main.c
@@ -7,6 +7,7 @@
 #include <uart.h>
 #include <console.h>
 #include <system.h>
+#include <hw/common.h>
 #include <generated/csr.h>
 
 #include "elf_loader.h"
@@ -145,11 +146,35 @@ static void rtio_sync(int channel)
 	while(rtio_o_level_read() != 0);
 }
 
+#define DDS_FTW   0x0a
+#define DDS_PTW   0x0e
+#define DDS_FUD   0x40
+#define DDS_GPIO  0x41
+
+#define DDS_WRITE1(addr, data) \
+	MMPTR(0xb0000000 + (addr)*4) = data
+
+#define DDS_WRITE2(addr, data) \
+	DDS_WRITE1(addr, (data) >> 8); \
+	DDS_WRITE1((addr) + 1, data)
+
+#define DDS_WRITE4(addr, data) \
+	DDS_WRITE2(addr, (data) >> 16); \
+	DDS_WRITE2((addr) + 2, data)
+
+static void dds_program(int channel, int ftw)
+{
+	DDS_WRITE1(DDS_GPIO, channel);
+	DDS_WRITE4(DDS_FTW, ftw);
+	DDS_WRITE1(DDS_FUD, 0);
+}
+
 static const struct symbol syscalls[] = {
 	{"__syscall_rpc",			rpc},
 	{"__syscall_gpio_set",		gpio_set},
 	{"__syscall_rtio_set",		rtio_set},
 	{"__syscall_rtio_sync",		rtio_sync},
+	{"__syscall_dds_program",	dds_program},
 	{NULL, NULL}
 };