[U-Boot] [PATCH 02/11] powerpc/ppc4xx: Add gdsys mclink interface

Dirk Eibach
2013-04-22T11:16:03Z

mclink is a serial interface for communication between gdsys FPGA.

Signed-off-by: Dirk Eibach <eibach@gdsys.de>
---
board/gdsys/common/Makefile | 2 +-
board/gdsys/common/mclink.c | 140 +++++++++++++++++++++++++++++++++++++++++++
board/gdsys/common/mclink.h | 31 ++++++++++
3 files changed, 172 insertions(+), 1 deletion(-)
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..6c86145
--- /dev/null
+++ b/board/gdsys/common/mclink.c
@@ -0,0 +1,140 @@
+/*
+ * (C) Copyright 2012
+ * Dirk Eibach, Guntermann & Drunck GmbH, eibach at gdsys.de
+ *
+ * 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..af3d667
--- /dev/null
+++ b/board/gdsys/common/mclink.h
@@ -0,0 +1,31 @@
+/*
+ * (C) Copyright 2012
+ * Dirk Eibach, Guntermann & Drunck GmbH, eibach at gdsys.de
+ *
+ * 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
--
1.7.10.4