Initial file dump from open source releaseHEADmaster

1 files changed, 127 insertions, 0 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
new file mode 100644
index 00000000..c9d942a5
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
@@ -0,0 +1,127 @@
+/*******************************************************************************
+  Specialised functions for managing Ring mode
+
+  Copyright(C) 2011  STMicroelectronics Ltd
+
+  It defines all the functions used to handle the normal/enhanced
+  descriptors in case of the DMA is configured to work in chained or
+  in ring mode.
+
+  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 "stmmac.h"
+
+static unsigned int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
+{
+	struct stmmac_priv *priv = (struct stmmac_priv *)p;
+	unsigned int txsize = priv->dma_tx_size;
+	unsigned int entry = priv->cur_tx % txsize;
+	struct dma_desc *desc = priv->dma_tx + entry;
+	unsigned int nopaged_len = skb_headlen(skb);
+	unsigned int bmax, len;
+
+	if (priv->plat->enh_desc)
+		bmax = BUF_SIZE_8KiB;
+	else
+		bmax = BUF_SIZE_2KiB;
+
+	len = nopaged_len - bmax;
+
+	if (nopaged_len > BUF_SIZE_8KiB) {
+
+		desc->des2 = dma_map_single(priv->device, skb->data,
+					    bmax, DMA_TO_DEVICE);
+		priv->tx_skbuff_dma[entry] = desc->des2;
+		desc->des3 = desc->des2 + BUF_SIZE_4KiB;
+		priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum,
+						STMMAC_RING_MODE);
+		wmb();
+		entry = (++priv->cur_tx) % txsize;
+		desc = priv->dma_tx + entry;
+
+		desc->des2 = dma_map_single(priv->device, skb->data + bmax,
+					    len, DMA_TO_DEVICE);
+		priv->tx_skbuff_dma[entry] = desc->des2;
+		desc->des3 = desc->des2 + BUF_SIZE_4KiB;
+		priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
+						STMMAC_RING_MODE);
+		wmb();
+		priv->hw->desc->set_tx_owner(desc);
+		priv->tx_skbuff[entry] = NULL;
+	} else {
+		desc->des2 = dma_map_single(priv->device, skb->data,
+					    nopaged_len, DMA_TO_DEVICE);
+		priv->tx_skbuff_dma[entry] = desc->des2;
+		desc->des3 = desc->des2 + BUF_SIZE_4KiB;
+		priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len, csum,
+						STMMAC_RING_MODE);
+	}
+
+	return entry;
+}
+
+static unsigned int stmmac_is_jumbo_frm(int len, int enh_desc)
+{
+	unsigned int ret = 0;
+
+	if (len >= BUF_SIZE_4KiB)
+		ret = 1;
+
+	return ret;
+}
+
+static void stmmac_refill_desc3(void *priv_ptr, struct dma_desc *p)
+{
+	struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr;
+
+	if (unlikely(priv->plat->has_gmac))
+		/* Fill DES3 in case of RING mode */
+		if (priv->dma_buf_sz >= BUF_SIZE_8KiB)
+			p->des3 = p->des2 + BUF_SIZE_8KiB;
+}
+
+/* In ring mode we need to fill the desc3 because it is used as buffer */
+static void stmmac_init_desc3(struct dma_desc *p)
+{
+	p->des3 = p->des2 + BUF_SIZE_8KiB;
+}
+
+static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p)
+{
+	if (unlikely(p->des3))
+		p->des3 = 0;
+}
+
+static int stmmac_set_16kib_bfsize(int mtu)
+{
+	int ret = 0;
+	if (unlikely(mtu >= BUF_SIZE_8KiB))
+		ret = BUF_SIZE_16KiB;
+	return ret;
+}
+
+const struct stmmac_ring_mode_ops ring_mode_ops = {
+	.is_jumbo_frm = stmmac_is_jumbo_frm,
+	.jumbo_frm = stmmac_jumbo_frm,
+	.refill_desc3 = stmmac_refill_desc3,
+	.init_desc3 = stmmac_init_desc3,
+	.clean_desc3 = stmmac_clean_desc3,
+	.set_16kib_bfsize = stmmac_set_16kib_bfsize,
+};