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path: root/drivers/net/stmmac/norm_desc.c
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Diffstat (limited to 'drivers/net/stmmac/norm_desc.c')
-rw-r--r--drivers/net/stmmac/norm_desc.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/drivers/net/stmmac/norm_desc.c b/drivers/net/stmmac/norm_desc.c
new file mode 100644
index 000000000000..31ad53643792
--- /dev/null
+++ b/drivers/net/stmmac/norm_desc.c
@@ -0,0 +1,236 @@
+/*******************************************************************************
+ This contains the functions to handle the normal descriptors.
+
+ Copyright (C) 2007-2009 STMicroelectronics Ltd
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms and conditions of the GNU General Public License,
+ version 2, as published by the Free Software Foundation.
+
+ This program is distributed in the hope 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 St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+ The full GNU General Public License is included in this distribution in
+ the file called "COPYING".
+
+ Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
+*******************************************************************************/
+
+#include "common.h"
+
+static int ndesc_get_tx_status(void *data, struct stmmac_extra_stats *x,
+ struct dma_desc *p, unsigned long ioaddr)
+{
+ int ret = 0;
+ struct net_device_stats *stats = (struct net_device_stats *)data;
+
+ if (unlikely(p->des01.tx.error_summary)) {
+ if (unlikely(p->des01.tx.underflow_error)) {
+ x->tx_underflow++;
+ stats->tx_fifo_errors++;
+ }
+ if (unlikely(p->des01.tx.no_carrier)) {
+ x->tx_carrier++;
+ stats->tx_carrier_errors++;
+ }
+ if (unlikely(p->des01.tx.loss_carrier)) {
+ x->tx_losscarrier++;
+ stats->tx_carrier_errors++;
+ }
+ if (unlikely((p->des01.tx.excessive_deferral) ||
+ (p->des01.tx.excessive_collisions) ||
+ (p->des01.tx.late_collision)))
+ stats->collisions += p->des01.tx.collision_count;
+ ret = -1;
+ }
+ if (unlikely(p->des01.tx.heartbeat_fail)) {
+ x->tx_heartbeat++;
+ stats->tx_heartbeat_errors++;
+ ret = -1;
+ }
+ if (unlikely(p->des01.tx.deferred))
+ x->tx_deferred++;
+
+ return ret;
+}
+
+static int ndesc_get_tx_len(struct dma_desc *p)
+{
+ return p->des01.tx.buffer1_size;
+}
+
+/* This function verifies if each incoming frame has some errors
+ * and, if required, updates the multicast statistics.
+ * In case of success, it returns csum_none becasue the device
+ * is not able to compute the csum in HW. */
+static int ndesc_get_rx_status(void *data, struct stmmac_extra_stats *x,
+ struct dma_desc *p)
+{
+ int ret = csum_none;
+ struct net_device_stats *stats = (struct net_device_stats *)data;
+
+ if (unlikely(p->des01.rx.last_descriptor == 0)) {
+ pr_warning("ndesc Error: Oversized Ethernet "
+ "frame spanned multiple buffers\n");
+ stats->rx_length_errors++;
+ return discard_frame;
+ }
+
+ if (unlikely(p->des01.rx.error_summary)) {
+ if (unlikely(p->des01.rx.descriptor_error))
+ x->rx_desc++;
+ if (unlikely(p->des01.rx.partial_frame_error))
+ x->rx_partial++;
+ if (unlikely(p->des01.rx.run_frame))
+ x->rx_runt++;
+ if (unlikely(p->des01.rx.frame_too_long))
+ x->rx_toolong++;
+ if (unlikely(p->des01.rx.collision)) {
+ x->rx_collision++;
+ stats->collisions++;
+ }
+ if (unlikely(p->des01.rx.crc_error)) {
+ x->rx_crc++;
+ stats->rx_crc_errors++;
+ }
+ ret = discard_frame;
+ }
+ if (unlikely(p->des01.rx.dribbling))
+ ret = discard_frame;
+
+ if (unlikely(p->des01.rx.length_error)) {
+ x->rx_length++;
+ ret = discard_frame;
+ }
+ if (unlikely(p->des01.rx.mii_error)) {
+ x->rx_mii++;
+ ret = discard_frame;
+ }
+ if (p->des01.rx.multicast_frame) {
+ x->rx_multicast++;
+ stats->multicast++;
+ }
+ return ret;
+}
+
+static void ndesc_init_rx_desc(struct dma_desc *p, unsigned int ring_size,
+ int disable_rx_ic)
+{
+ int i;
+ for (i = 0; i < ring_size; i++) {
+ p->des01.rx.own = 1;
+ p->des01.rx.buffer1_size = BUF_SIZE_2KiB - 1;
+ if (i == ring_size - 1)
+ p->des01.rx.end_ring = 1;
+ if (disable_rx_ic)
+ p->des01.rx.disable_ic = 1;
+ p++;
+ }
+}
+
+static void ndesc_init_tx_desc(struct dma_desc *p, unsigned int ring_size)
+{
+ int i;
+ for (i = 0; i < ring_size; i++) {
+ p->des01.tx.own = 0;
+ if (i == ring_size - 1)
+ p->des01.tx.end_ring = 1;
+ p++;
+ }
+}
+
+static int ndesc_get_tx_owner(struct dma_desc *p)
+{
+ return p->des01.tx.own;
+}
+
+static int ndesc_get_rx_owner(struct dma_desc *p)
+{
+ return p->des01.rx.own;
+}
+
+static void ndesc_set_tx_owner(struct dma_desc *p)
+{
+ p->des01.tx.own = 1;
+}
+
+static void ndesc_set_rx_owner(struct dma_desc *p)
+{
+ p->des01.rx.own = 1;
+}
+
+static int ndesc_get_tx_ls(struct dma_desc *p)
+{
+ return p->des01.tx.last_segment;
+}
+
+static void ndesc_release_tx_desc(struct dma_desc *p)
+{
+ int ter = p->des01.tx.end_ring;
+
+ /* clean field used within the xmit */
+ p->des01.tx.first_segment = 0;
+ p->des01.tx.last_segment = 0;
+ p->des01.tx.buffer1_size = 0;
+
+ /* clean status reported */
+ p->des01.tx.error_summary = 0;
+ p->des01.tx.underflow_error = 0;
+ p->des01.tx.no_carrier = 0;
+ p->des01.tx.loss_carrier = 0;
+ p->des01.tx.excessive_deferral = 0;
+ p->des01.tx.excessive_collisions = 0;
+ p->des01.tx.late_collision = 0;
+ p->des01.tx.heartbeat_fail = 0;
+ p->des01.tx.deferred = 0;
+
+ /* set termination field */
+ p->des01.tx.end_ring = ter;
+}
+
+static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
+ int csum_flag)
+{
+ p->des01.tx.first_segment = is_fs;
+ p->des01.tx.buffer1_size = len;
+}
+
+static void ndesc_clear_tx_ic(struct dma_desc *p)
+{
+ p->des01.tx.interrupt = 0;
+}
+
+static void ndesc_close_tx_desc(struct dma_desc *p)
+{
+ p->des01.tx.last_segment = 1;
+ p->des01.tx.interrupt = 1;
+}
+
+static int ndesc_get_rx_frame_len(struct dma_desc *p)
+{
+ return p->des01.rx.frame_length;
+}
+
+struct stmmac_desc_ops ndesc_ops = {
+ .tx_status = ndesc_get_tx_status,
+ .rx_status = ndesc_get_rx_status,
+ .get_tx_len = ndesc_get_tx_len,
+ .init_rx_desc = ndesc_init_rx_desc,
+ .init_tx_desc = ndesc_init_tx_desc,
+ .get_tx_owner = ndesc_get_tx_owner,
+ .get_rx_owner = ndesc_get_rx_owner,
+ .release_tx_desc = ndesc_release_tx_desc,
+ .prepare_tx_desc = ndesc_prepare_tx_desc,
+ .clear_tx_ic = ndesc_clear_tx_ic,
+ .close_tx_desc = ndesc_close_tx_desc,
+ .get_tx_ls = ndesc_get_tx_ls,
+ .set_tx_owner = ndesc_set_tx_owner,
+ .set_rx_owner = ndesc_set_rx_owner,
+ .get_rx_frame_len = ndesc_get_rx_frame_len,
+};