--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/target-utils/c139explore/uwire.c	Sat Jun 11 00:13:35 2016 +0000
@@ -0,0 +1,103 @@
+/* Driver for uWire Master Controller inside TI Calypso */
+/* lifted from OsmocomBB and ported to FreeCalypso target-utils environment */
+
+/* (C) 2010 by Sylvain Munaut <tnt@246tNt.com>
+ *
+ * All Rights Reserved
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "types.h"
+
+struct uwire_regs {
+	u16	reg_data;
+	u16	reg_csr;
+	u16	reg_sr1;
+	u16	reg_sr2;
+	u16	reg_sr3;
+};
+
+#define	UWIRE_REGS	(*(volatile struct uwire_regs *) 0xFFFE4000)
+
+#define UWIRE_CSR_BITS_RD(n)	(((n) & 0x1f) << 0)
+#define UWIRE_CSR_BITS_WR(n)	(((n) & 0x1f) << 5)
+#define UWIRE_CSR_IDX(n)	(((n) & 3) << 10)
+#define UWIRE_CSR_CS_CMD	(1 << 12)
+#define UWIRE_CSR_START		(1 << 13)
+#define UWIRE_CSR_CSRB		(1 << 14)
+#define UWIRE_CSR_RDRB		(1 << 15)
+
+#define UWIRE_CSn_EDGE_RD	(1 << 0)	/* 1=falling 0=rising */
+#define UWIRE_CSn_EDGE_WR	(1 << 1)	/* 1=falling 0=rising */
+#define UWIRE_CSn_CS_LVL	(1 << 2)
+#define UWIRE_CSn_FRQ_DIV2	(0 << 3)
+#define UWIRE_CSn_FRQ_DIV4	(1 << 3)
+#define UWIRE_CSn_FRQ_DIV8	(2 << 3)
+#define UWIRE_CSn_CKH
+
+#define UWIRE_CSn_SHIFT(n)	(((n) & 1) ? 6 : 0)
+#define UWIRE_CSn_REG(n)	(((n) & 2) ? REG_SR2 : REG_SR1)
+
+#define UWIRE_SR3_CLK_EN	(1 << 0)
+#define UWIRE_SR3_CLK_DIV2	(0 << 1)
+#define UWIRE_SR3_CLK_DIV4	(1 << 1)
+#define UWIRE_SR3_CLK_DIV7	(2 << 1)
+#define UWIRE_SR3_CLK_DIV10	(3 << 1)
+
+static inline void _uwire_wait(int mask, int val)
+{
+	while ((UWIRE_REGS.reg_csr & mask) != val);
+}
+
+/*
+ * Let's try changing the chip select logic from OsmocomBB way
+ * to the way seen in TI's R2D source.
+ */
+
+void uwire_init(void)
+{
+	UWIRE_REGS.reg_sr3 = UWIRE_SR3_CLK_EN | UWIRE_SR3_CLK_DIV2;
+	UWIRE_REGS.reg_sr1 = UWIRE_CSn_FRQ_DIV2;
+#if 0
+	UWIRE_REGS.reg_sr1 = UWIRE_CSn_CS_LVL | UWIRE_CSn_FRQ_DIV2;
+	UWIRE_REGS.reg_csr = UWIRE_CSR_IDX(0) | UWIRE_CSR_CS_CMD;
+	_uwire_wait(UWIRE_CSR_CSRB, 0);
+#endif
+}
+
+send_via_uwire(word)
+	unsigned word;
+{
+#if 0
+	/* select the chip */
+	UWIRE_REGS.reg_csr = UWIRE_CSR_IDX(0) | UWIRE_CSR_CS_CMD;
+	_uwire_wait(UWIRE_CSR_CSRB, 0);
+#endif
+
+	UWIRE_REGS.reg_data = word << 7;
+	UWIRE_REGS.reg_csr = UWIRE_CSR_BITS_WR(9) | UWIRE_CSR_START
+				| UWIRE_CSR_CS_CMD;
+	_uwire_wait(UWIRE_CSR_CSRB, 0);
+
+	/* unselect the chip */
+	UWIRE_REGS.reg_csr = UWIRE_CSR_IDX(0) | 0;
+#if 0
+	_uwire_wait(UWIRE_CSR_CSRB, 0);
+#endif
+
+	return 0;
+}