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Diffstat (limited to 'drivers/net/xilinx_ll_temac_fifo.c')
-rw-r--r--drivers/net/xilinx_ll_temac_fifo.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/net/xilinx_ll_temac_fifo.c b/drivers/net/xilinx_ll_temac_fifo.c
new file mode 100644
index 0000000000..3ff0f347ed
--- /dev/null
+++ b/drivers/net/xilinx_ll_temac_fifo.c
@@ -0,0 +1,143 @@
+/*
+ * Xilinx xps_ll_temac ethernet driver for u-boot
+ *
+ * FIFO sub-controller
+ *
+ * Copyright (C) 2011 - 2012 Stephan Linz <linz@li-pro.net>
+ * Copyright (C) 2008 - 2011 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2008 - 2011 PetaLogix
+ *
+ * Based on Yoshio Kashiwagi kashiwagi@co-nss.co.jp driver
+ * Copyright (C) 2008 Nissin Systems Co.,Ltd.
+ * March 2008 created
+ *
+ * CREDITS: tsec driver
+ *
+ * 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.
+ *
+ * [0]: http://www.xilinx.com/support/documentation
+ *
+ * [F]: [0]/ip_documentation/xps_ll_fifo.pdf
+ * [S]: [0]/ip_documentation/xps_ll_temac.pdf
+ * [A]: [0]/application_notes/xapp1041.pdf
+ */
+
+#include <config.h>
+#include <common.h>
+#include <net.h>
+
+#include <asm/types.h>
+#include <asm/io.h>
+
+#include "xilinx_ll_temac.h"
+#include "xilinx_ll_temac_fifo.h"
+
+int ll_temac_reset_fifo(struct eth_device *dev)
+{
+ struct ll_temac *ll_temac = dev->priv;
+ struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr;
+
+ out_be32(&fifo_ctrl->tdfr, LL_FIFO_TDFR_KEY);
+ out_be32(&fifo_ctrl->rdfr, LL_FIFO_RDFR_KEY);
+ out_be32(&fifo_ctrl->isr, ~0UL);
+ out_be32(&fifo_ctrl->ier, 0);
+
+ return 0;
+}
+
+int ll_temac_recv_fifo(struct eth_device *dev)
+{
+ int i, length = 0;
+ u32 *buf = (u32 *)NetRxPackets[0];
+ struct ll_temac *ll_temac = dev->priv;
+ struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr;
+
+ if (in_be32(&fifo_ctrl->isr) & LL_FIFO_ISR_RC) {
+
+ /* reset isr */
+ out_be32(&fifo_ctrl->isr, ~0UL);
+
+ /*
+ * MAYBE here:
+ * while (fifo_ctrl->isr);
+ */
+
+ /*
+ * The length is written (into RLR) by the XPS LL FIFO
+ * when the packet is received across the RX LocalLink
+ * interface and the receive data FIFO had enough
+ * locations that all of the packet data has been saved.
+ * The RLR should only be read when a receive packet is
+ * available for processing (the receive occupancy is
+ * not zero). Once the RLR is read, the receive packet
+ * data should be read from the receive data FIFO before
+ * the RLR is read again.
+ *
+ * [F] page 17, Receive Length Register (RLR)
+ */
+ if (in_be32(&fifo_ctrl->rdfo) & LL_FIFO_RDFO_MASK) {
+ length = in_be32(&fifo_ctrl->rlf) & LL_FIFO_RLF_MASK;
+ } else {
+ printf("%s: Got error, no receive occupancy\n",
+ __func__);
+ return -1;
+ }
+
+ if (length > PKTSIZE_ALIGN) {
+ printf("%s: Got error, receive package too big (%i)\n",
+ __func__, length);
+ ll_temac_reset_fifo(dev);
+ return -1;
+ }
+
+ for (i = 0; i < length; i += 4)
+ *buf++ = in_be32(&fifo_ctrl->rdfd);
+
+ NetReceive(NetRxPackets[0], length);
+ }
+
+ return 0;
+}
+
+int ll_temac_send_fifo(struct eth_device *dev, volatile void *packet,
+ int length)
+{
+ int i;
+ u32 *buf = (u32 *)packet;
+ struct ll_temac *ll_temac = dev->priv;
+ struct fifo_ctrl *fifo_ctrl = (void *)ll_temac->ctrladdr;
+
+ if (length < LL_FIFO_TLF_MIN) {
+ printf("%s: Got error, transmit package too small (%i)\n",
+ __func__, length);
+ return -1;
+ }
+
+ if (length > LL_FIFO_TLF_MAX) {
+ printf("%s: Got error, transmit package too big (%i)\n",
+ __func__, length);
+ return -1;
+ }
+
+ for (i = 0; i < length; i += 4)
+ out_be32(&fifo_ctrl->tdfd, *buf++);
+
+ /*
+ * Once the packet length is written to the TLR it is
+ * automatically moved to the transmit data FIFO with
+ * the packet data freeing up the TLR for another value.
+ * The packet length must be written to the TLR after
+ * the packet data is written to the transmit data FIFO.
+ * It is not valid to write data for multiple packets
+ * to the transmit data FIFO before writing the packet
+ * length values.
+ *
+ * [F] page 17, Transmit Length Register (TLR)
+ */
+ out_be32(&fifo_ctrl->tlf, length);
+
+ return 0;
+}