[U-Boot] [PATCH v2 02/10] powerpc/ppc4xx: Add gdsys mclink interface

[dirk.eibach at gdsys.cc]

From: Dirk Eibach <eibach at gdsys.de>

mclink is a serial interface for communication between gdsys FPGA.

Signed-off-by: Dirk Eibach <dirk.eibach at gdsys.cc>

---
Changes in v2:
- update email account

 board/gdsys/common/Makefile |    2 +-
 board/gdsys/common/mclink.c |  140 +++++++++++++++++++++++++++++++++++++++++++
 board/gdsys/common/mclink.h |   31 ++++++++++
 3 files changed, 172 insertions(+), 1 deletions(-)
 create mode 100644 board/gdsys/common/mclink.c
 create mode 100644 board/gdsys/common/mclink.h

diff --git a/board/gdsys/common/Makefile b/board/gdsys/common/Makefile
index 05dd65d..6f09550 100644
--- a/board/gdsys/common/Makefile
+++ b/board/gdsys/common/Makefile
@@ -31,7 +31,7 @@ LIB	= $(obj)lib$(VENDOR).o
 
 COBJS-$(CONFIG_IO) += miiphybb.o
 COBJS-$(CONFIG_IO64) += miiphybb.o
-COBJS-$(CONFIG_IOCON) += osd.o
+COBJS-$(CONFIG_IOCON) += osd.o mclink.o
 COBJS-$(CONFIG_DLVISION_10G) += osd.o
 
 COBJS   := $(COBJS-y)
diff --git a/board/gdsys/common/mclink.c b/board/gdsys/common/mclink.c
new file mode 100644
index 0000000..9a4f3e9
--- /dev/null
+++ b/board/gdsys/common/mclink.c
@@ -0,0 +1,140 @@
+/*
+ * (C) Copyright 2012
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach at gdsys.cc
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <errno.h>
+
+#include <gdsys_fpga.h>
+
+enum {
+	MCINT_SLAVE_LINK_CHANGED_EV = 1 << 7,
+	MCINT_TX_ERROR_EV = 1 << 9,
+	MCINT_TX_BUFFER_FREE = 1 << 10,
+	MCINT_TX_PACKET_TRANSMITTED_EV = 1 << 11,
+	MCINT_RX_ERROR_EV = 1 << 13,
+	MCINT_RX_CONTENT_AVAILABLE = 1 << 14,
+	MCINT_RX_PACKET_RECEIVED_EV = 1 << 15,
+};
+
+int mclink_probe(void)
+{
+	unsigned int k;
+	unsigned int ctr = 0;
+	int slaves = 0;
+
+	for (k = 0; k < CONFIG_SYS_MCLINK_MAX; ++k) {
+		int timeout = 0;
+
+		if (!(fpga_get_reg(k, REG(mc_status)) & (1 << 15)))
+			break;
+
+		fpga_set_reg(k, REG(mc_control), 0x8000);
+
+		while (!(fpga_get_reg(k, REG(mc_status)) & (1 << 14))) {
+			udelay(100);
+			if (ctr++ > 3) {
+				timeout = 1;
+				break;
+			}
+		}
+		if (timeout)
+			break;
+
+		slaves++;
+	}
+
+	return slaves;
+}
+
+int mclink_send(u8 slave, u16 addr, u16 data)
+{
+	unsigned int ctr = 0;
+	u16 int_status;
+	u16 rx_cmd_status;
+	u16 rx_cmd;
+
+	/* reset interrupt status */
+	int_status = fpga_get_reg(0, REG(mc_int));
+	fpga_set_reg(0, REG(mc_int), int_status);
+
+	/* send */
+	fpga_set_reg(0, REG(mc_tx_address), addr);
+	fpga_set_reg(0, REG(mc_tx_data), data);
+	fpga_set_reg(0, REG(mc_tx_cmd), (slave & 0x03) << 14);
+	fpga_set_reg(0, REG(mc_control), 0x8001);
+
+	/* wait for reply */
+	while (!(fpga_get_reg(0, REG(mc_int)) & MCINT_RX_PACKET_RECEIVED_EV)) {
+		udelay(100);
+		if (ctr++ > 3)
+			return -ETIMEDOUT;
+	}
+
+	rx_cmd_status = fpga_get_reg(0, REG(mc_rx_cmd_status));
+	rx_cmd = (rx_cmd_status >> 12) & 0x03;
+	if (rx_cmd != 0)
+		printf("mclink_send: received cmd %d, expected %d\n", rx_cmd,
+		       0);
+
+	return 0;
+}
+
+int mclink_receive(u8 slave, u16 addr, u16 *data)
+{
+	u16 rx_cmd_status;
+	u16 rx_cmd;
+	unsigned int ctr = 0;
+
+	/* send read request */
+	fpga_set_reg(0, REG(mc_tx_address), addr);
+	fpga_set_reg(0, REG(mc_tx_cmd),
+		     ((slave & 0x03) << 14) | (1 << 12) | (1 << 0));
+	fpga_set_reg(0, REG(mc_control), 0x8001);
+
+	/* wait for reply */
+	while (!(fpga_get_reg(0, REG(mc_int)) & MCINT_RX_CONTENT_AVAILABLE)) {
+		udelay(100);
+		if (ctr++ > 3)
+			return -ETIMEDOUT;
+	}
+
+	/* check reply */
+	rx_cmd_status = fpga_get_reg(0, REG(mc_rx_cmd_status));
+	if ((rx_cmd_status >> 14) != slave) {
+		printf("mclink_receive: reply from slave %d, expected %d\n",
+		       rx_cmd_status >> 14, slave);
+		return -EINVAL;
+	}
+
+	rx_cmd = (rx_cmd_status >> 12) & 0x03;
+	if (rx_cmd != 1) {
+		printf("mclink_send: received cmd %d, expected %d\n",
+		       rx_cmd, 1);
+		return -EIO;
+	}
+
+	*data = fpga_get_reg(0, REG(mc_rx_data));
+
+	return 0;
+}
diff --git a/board/gdsys/common/mclink.h b/board/gdsys/common/mclink.h
new file mode 100644
index 0000000..47a62b4
--- /dev/null
+++ b/board/gdsys/common/mclink.h
@@ -0,0 +1,31 @@
+/*
+ * (C) Copyright 2012
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach at gdsys.cc
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _MCLINK_H_
+#define _MCLINK_H_
+
+int mclink_probe(void);
+int mclink_send(u8 slave, u16 addr, u16 data);
+int mclink_receive(u8 slave, u16 addr, u16 *data);
+
+#endif
-- 
1.7.2.5