1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/descs_com.h b/drivers/net/ethernet/stmicro/stmmac/descs_com.h
new file mode 100644
index 000000000..40f7f2da9
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/descs_com.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*******************************************************************************
+  Header File to describe Normal/enhanced descriptor functions used for RING
+  and CHAINED modes.
+
+  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>
+*******************************************************************************/
+
+#ifndef __DESC_COM_H__
+#define __DESC_COM_H__
+
+/* Specific functions used for Ring mode */
+
+/* Enhanced descriptors */
+static inline void ehn_desc_rx_set_on_ring(struct dma_desc *p, int end,
+					   int bfsize)
+{
+	if (bfsize == BUF_SIZE_16KiB)
+		p->des1 |= cpu_to_le32((BUF_SIZE_8KiB
+				<< ERDES1_BUFFER2_SIZE_SHIFT)
+			   & ERDES1_BUFFER2_SIZE_MASK);
+
+	if (end)
+		p->des1 |= cpu_to_le32(ERDES1_END_RING);
+}
+
+static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int end)
+{
+	if (end)
+		p->des0 |= cpu_to_le32(ETDES0_END_RING);
+	else
+		p->des0 &= cpu_to_le32(~ETDES0_END_RING);
+}
+
+static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
+{
+	if (unlikely(len > BUF_SIZE_4KiB)) {
+		p->des1 |= cpu_to_le32((((len - BUF_SIZE_4KiB)
+					<< ETDES1_BUFFER2_SIZE_SHIFT)
+			    & ETDES1_BUFFER2_SIZE_MASK) | (BUF_SIZE_4KiB
+			    & ETDES1_BUFFER1_SIZE_MASK));
+	} else
+		p->des1 |= cpu_to_le32((len & ETDES1_BUFFER1_SIZE_MASK));
+}
+
+/* Normal descriptors */
+static inline void ndesc_rx_set_on_ring(struct dma_desc *p, int end, int bfsize)
+{
+	if (bfsize >= BUF_SIZE_2KiB) {
+		int bfsize2;
+
+		bfsize2 = min(bfsize - BUF_SIZE_2KiB + 1, BUF_SIZE_2KiB - 1);
+		p->des1 |= cpu_to_le32((bfsize2 << RDES1_BUFFER2_SIZE_SHIFT)
+			    & RDES1_BUFFER2_SIZE_MASK);
+	}
+
+	if (end)
+		p->des1 |= cpu_to_le32(RDES1_END_RING);
+}
+
+static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int end)
+{
+	if (end)
+		p->des1 |= cpu_to_le32(TDES1_END_RING);
+	else
+		p->des1 &= cpu_to_le32(~TDES1_END_RING);
+}
+
+static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
+{
+	if (unlikely(len > BUF_SIZE_2KiB)) {
+		unsigned int buffer1 = (BUF_SIZE_2KiB - 1)
+					& TDES1_BUFFER1_SIZE_MASK;
+		p->des1 |= cpu_to_le32((((len - buffer1)
+					<< TDES1_BUFFER2_SIZE_SHIFT)
+				& TDES1_BUFFER2_SIZE_MASK) | buffer1);
+	} else
+		p->des1 |= cpu_to_le32((len & TDES1_BUFFER1_SIZE_MASK));
+}
+
+/* Specific functions used for Chain mode */
+
+/* Enhanced descriptors */
+static inline void ehn_desc_rx_set_on_chain(struct dma_desc *p)
+{
+	p->des1 |= cpu_to_le32(ERDES1_SECOND_ADDRESS_CHAINED);
+}
+
+static inline void enh_desc_end_tx_desc_on_chain(struct dma_desc *p)
+{
+	p->des0 |= cpu_to_le32(ETDES0_SECOND_ADDRESS_CHAINED);
+}
+
+static inline void enh_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
+{
+	p->des1 |= cpu_to_le32(len & ETDES1_BUFFER1_SIZE_MASK);
+}
+
+/* Normal descriptors */
+static inline void ndesc_rx_set_on_chain(struct dma_desc *p, int end)
+{
+	p->des1 |= cpu_to_le32(RDES1_SECOND_ADDRESS_CHAINED);
+}
+
+static inline void ndesc_tx_set_on_chain(struct dma_desc *p)
+{
+	p->des1 |= cpu_to_le32(TDES1_SECOND_ADDRESS_CHAINED);
+}
+
+static inline void norm_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
+{
+	p->des1 |= cpu_to_le32(len & TDES1_BUFFER1_SIZE_MASK);
+}
+#endif /* __DESC_COM_H__ */