Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 166 insertions, 0 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
new file mode 100644
index 0000000000..fb55efd522
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*******************************************************************************
+  Specialised functions for managing Chained 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.
+
+
+  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
+*******************************************************************************/
+
+#include "stmmac.h"
+
+static int jumbo_frm(struct stmmac_tx_queue *tx_q, struct sk_buff *skb,
+		     int csum)
+{
+	unsigned int nopaged_len = skb_headlen(skb);
+	struct stmmac_priv *priv = tx_q->priv_data;
+	unsigned int entry = tx_q->cur_tx;
+	unsigned int bmax, des2;
+	unsigned int i = 1, len;
+	struct dma_desc *desc;
+
+	desc = tx_q->dma_tx + entry;
+
+	if (priv->plat->enh_desc)
+		bmax = BUF_SIZE_8KiB;
+	else
+		bmax = BUF_SIZE_2KiB;
+
+	len = nopaged_len - bmax;
+
+	des2 = dma_map_single(priv->device, skb->data,
+			      bmax, DMA_TO_DEVICE);
+	desc->des2 = cpu_to_le32(des2);
+	if (dma_mapping_error(priv->device, des2))
+		return -1;
+	tx_q->tx_skbuff_dma[entry].buf = des2;
+	tx_q->tx_skbuff_dma[entry].len = bmax;
+	/* do not close the descriptor and do not set own bit */
+	stmmac_prepare_tx_desc(priv, desc, 1, bmax, csum, STMMAC_CHAIN_MODE,
+			0, false, skb->len);
+
+	while (len != 0) {
+		tx_q->tx_skbuff[entry] = NULL;
+		entry = STMMAC_GET_ENTRY(entry, priv->dma_conf.dma_tx_size);
+		desc = tx_q->dma_tx + entry;
+
+		if (len > bmax) {
+			des2 = dma_map_single(priv->device,
+					      (skb->data + bmax * i),
+					      bmax, DMA_TO_DEVICE);
+			desc->des2 = cpu_to_le32(des2);
+			if (dma_mapping_error(priv->device, des2))
+				return -1;
+			tx_q->tx_skbuff_dma[entry].buf = des2;
+			tx_q->tx_skbuff_dma[entry].len = bmax;
+			stmmac_prepare_tx_desc(priv, desc, 0, bmax, csum,
+					STMMAC_CHAIN_MODE, 1, false, skb->len);
+			len -= bmax;
+			i++;
+		} else {
+			des2 = dma_map_single(priv->device,
+					      (skb->data + bmax * i), len,
+					      DMA_TO_DEVICE);
+			desc->des2 = cpu_to_le32(des2);
+			if (dma_mapping_error(priv->device, des2))
+				return -1;
+			tx_q->tx_skbuff_dma[entry].buf = des2;
+			tx_q->tx_skbuff_dma[entry].len = len;
+			/* last descriptor can be set now */
+			stmmac_prepare_tx_desc(priv, desc, 0, len, csum,
+					STMMAC_CHAIN_MODE, 1, true, skb->len);
+			len = 0;
+		}
+	}
+
+	tx_q->cur_tx = entry;
+
+	return entry;
+}
+
+static unsigned int is_jumbo_frm(int len, int enh_desc)
+{
+	unsigned int ret = 0;
+
+	if ((enh_desc && (len > BUF_SIZE_8KiB)) ||
+	    (!enh_desc && (len > BUF_SIZE_2KiB))) {
+		ret = 1;
+	}
+
+	return ret;
+}
+
+static void init_dma_chain(void *des, dma_addr_t phy_addr,
+				  unsigned int size, unsigned int extend_desc)
+{
+	/*
+	 * In chained mode the des3 points to the next element in the ring.
+	 * The latest element has to point to the head.
+	 */
+	int i;
+	dma_addr_t dma_phy = phy_addr;
+
+	if (extend_desc) {
+		struct dma_extended_desc *p = (struct dma_extended_desc *)des;
+		for (i = 0; i < (size - 1); i++) {
+			dma_phy += sizeof(struct dma_extended_desc);
+			p->basic.des3 = cpu_to_le32((unsigned int)dma_phy);
+			p++;
+		}
+		p->basic.des3 = cpu_to_le32((unsigned int)phy_addr);
+
+	} else {
+		struct dma_desc *p = (struct dma_desc *)des;
+		for (i = 0; i < (size - 1); i++) {
+			dma_phy += sizeof(struct dma_desc);
+			p->des3 = cpu_to_le32((unsigned int)dma_phy);
+			p++;
+		}
+		p->des3 = cpu_to_le32((unsigned int)phy_addr);
+	}
+}
+
+static void refill_desc3(struct stmmac_rx_queue *rx_q, struct dma_desc *p)
+{
+	struct stmmac_priv *priv = rx_q->priv_data;
+
+	if (priv->hwts_rx_en && !priv->extend_desc)
+		/* NOTE: Device will overwrite des3 with timestamp value if
+		 * 1588-2002 time stamping is enabled, hence reinitialize it
+		 * to keep explicit chaining in the descriptor.
+		 */
+		p->des3 = cpu_to_le32((unsigned int)(rx_q->dma_rx_phy +
+				      (((rx_q->dirty_rx) + 1) %
+				       priv->dma_conf.dma_rx_size) *
+				      sizeof(struct dma_desc)));
+}
+
+static void clean_desc3(struct stmmac_tx_queue *tx_q, struct dma_desc *p)
+{
+	struct stmmac_priv *priv = tx_q->priv_data;
+	unsigned int entry = tx_q->dirty_tx;
+
+	if (tx_q->tx_skbuff_dma[entry].last_segment && !priv->extend_desc &&
+	    priv->hwts_tx_en)
+		/* NOTE: Device will overwrite des3 with timestamp value if
+		 * 1588-2002 time stamping is enabled, hence reinitialize it
+		 * to keep explicit chaining in the descriptor.
+		 */
+		p->des3 = cpu_to_le32((unsigned int)((tx_q->dma_tx_phy +
+				      ((tx_q->dirty_tx + 1) %
+				       priv->dma_conf.dma_tx_size))
+				      * sizeof(struct dma_desc)));
+}
+
+const struct stmmac_mode_ops chain_mode_ops = {
+	.init = init_dma_chain,
+	.is_jumbo_frm = is_jumbo_frm,
+	.jumbo_frm = jumbo_frm,
+	.refill_desc3 = refill_desc3,
+	.clean_desc3 = clean_desc3,
+};