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authorDirk Eibach <eibach@gdsys.de>2013-06-26 16:04:27 +0200
committerStefan Roese <sr@denx.de>2013-07-25 19:35:42 +0200
commit049de79d85dda8933092185f705731fa75f9b275 (patch)
tree0fa2d344faa1f4c04fcdc956a1574ae10abef602 /board/gdsys/common
parentaba27acf6711dce0ef1507f2f9f02a80d70a45da (diff)
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powerpc/ppc4xx: Add gdsys mclink interface
mclink is a serial interface for communication between gdsys FPGA. Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc> Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'board/gdsys/common')
-rw-r--r--board/gdsys/common/mclink.c153
-rw-r--r--board/gdsys/common/mclink.h31
2 files changed, 184 insertions, 0 deletions
diff --git a/board/gdsys/common/mclink.c b/board/gdsys/common/mclink.c
new file mode 100644
index 0000000..e0382a3
--- /dev/null
+++ b/board/gdsys/common/mclink.c
@@ -0,0 +1,153 @@
+/*
+ * (C) Copyright 2012
+ * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@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;
+ int slaves = 0;
+
+ for (k = 0; k < CONFIG_SYS_MCLINK_MAX; ++k) {
+ int timeout = 0;
+ unsigned int ctr = 0;
+ u16 mc_status;
+
+ FPGA_GET_REG(k, mc_status, &mc_status);
+
+ if (!(mc_status & (1 << 15)))
+ break;
+
+ FPGA_SET_REG(k, mc_control, 0x8000);
+
+ FPGA_GET_REG(k, mc_status, &mc_status);
+ while (!(mc_status & (1 << 14))) {
+ udelay(100);
+ if (ctr++ > 500) {
+ timeout = 1;
+ break;
+ }
+ FPGA_GET_REG(k, mc_status, &mc_status);
+ }
+ if (timeout)
+ break;
+
+ printf("waited %d us for mclink %d to come up\n", ctr * 100, k);
+
+ 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 */
+ FPGA_GET_REG(0, mc_int, &int_status);
+ FPGA_SET_REG(0, mc_int, int_status);
+
+ /* send */
+ FPGA_SET_REG(0, mc_tx_address, addr);
+ FPGA_SET_REG(0, mc_tx_data, data);
+ FPGA_SET_REG(0, mc_tx_cmd, (slave & 0x03) << 14);
+ FPGA_SET_REG(0, mc_control, 0x8001);
+
+ /* wait for reply */
+ FPGA_GET_REG(0, mc_int, &int_status);
+ while (!(int_status & MCINT_RX_PACKET_RECEIVED_EV)) {
+ udelay(100);
+ if (ctr++ > 3)
+ return -ETIMEDOUT;
+ FPGA_GET_REG(0, mc_int, &int_status);
+ }
+
+ FPGA_GET_REG(0, mc_rx_cmd_status, &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;
+ u16 int_status;
+ unsigned int ctr = 0;
+
+ /* send read request */
+ FPGA_SET_REG(0, mc_tx_address, addr);
+ FPGA_SET_REG(0, mc_tx_cmd,
+ ((slave & 0x03) << 14) | (1 << 12) | (1 << 0));
+ FPGA_SET_REG(0, mc_control, 0x8001);
+
+
+ /* wait for reply */
+ FPGA_GET_REG(0, mc_int, &int_status);
+ while (!(int_status & MCINT_RX_CONTENT_AVAILABLE)) {
+ udelay(100);
+ if (ctr++ > 3)
+ return -ETIMEDOUT;
+ FPGA_GET_REG(0, mc_int, &int_status);
+ }
+
+ /* check reply */
+ FPGA_GET_REG(0, mc_rx_cmd_status, &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;
+ }
+
+ FPGA_GET_REG(0, mc_rx_data, 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@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