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131 lines
3.8 KiB
131 lines
3.8 KiB
/*******************************************************************************
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Header File to describe Normal/enhanced descriptor functions used for RING
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and CHAINED modes.
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Copyright(C) 2011 STMicroelectronics Ltd
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It defines all the functions used to handle the normal/enhanced
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descriptors in case of the DMA is configured to work in chained or
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in ring mode.
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*******************************************************************************/
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#ifndef __DESC_COM_H__
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#define __DESC_COM_H__
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/* Specific functions used for Ring mode */
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/* Enhanced descriptors */
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static inline void ehn_desc_rx_set_on_ring(struct dma_desc *p, int end,
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int bfsize)
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{
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if (bfsize == BUF_SIZE_16KiB)
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p->des1 |= cpu_to_le32((BUF_SIZE_8KiB
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<< ERDES1_BUFFER2_SIZE_SHIFT)
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& ERDES1_BUFFER2_SIZE_MASK);
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if (end)
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p->des1 |= cpu_to_le32(ERDES1_END_RING);
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}
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static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int end)
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{
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if (end)
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p->des0 |= cpu_to_le32(ETDES0_END_RING);
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else
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p->des0 &= cpu_to_le32(~ETDES0_END_RING);
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}
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static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
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{
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if (unlikely(len > BUF_SIZE_4KiB)) {
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p->des1 |= cpu_to_le32((((len - BUF_SIZE_4KiB)
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<< ETDES1_BUFFER2_SIZE_SHIFT)
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& ETDES1_BUFFER2_SIZE_MASK) | (BUF_SIZE_4KiB
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& ETDES1_BUFFER1_SIZE_MASK));
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} else
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p->des1 |= cpu_to_le32((len & ETDES1_BUFFER1_SIZE_MASK));
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}
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/* Normal descriptors */
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static inline void ndesc_rx_set_on_ring(struct dma_desc *p, int end, int bfsize)
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{
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if (bfsize >= BUF_SIZE_2KiB) {
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int bfsize2;
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bfsize2 = min(bfsize - BUF_SIZE_2KiB + 1, BUF_SIZE_2KiB - 1);
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p->des1 |= cpu_to_le32((bfsize2 << RDES1_BUFFER2_SIZE_SHIFT)
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& RDES1_BUFFER2_SIZE_MASK);
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}
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if (end)
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p->des1 |= cpu_to_le32(RDES1_END_RING);
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}
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static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int end)
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{
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if (end)
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p->des1 |= cpu_to_le32(TDES1_END_RING);
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else
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p->des1 &= cpu_to_le32(~TDES1_END_RING);
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}
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static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
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{
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if (unlikely(len > BUF_SIZE_2KiB)) {
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unsigned int buffer1 = (BUF_SIZE_2KiB - 1)
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& TDES1_BUFFER1_SIZE_MASK;
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p->des1 |= cpu_to_le32((((len - buffer1)
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<< TDES1_BUFFER2_SIZE_SHIFT)
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& TDES1_BUFFER2_SIZE_MASK) | buffer1);
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} else
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p->des1 |= cpu_to_le32((len & TDES1_BUFFER1_SIZE_MASK));
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}
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/* Specific functions used for Chain mode */
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/* Enhanced descriptors */
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static inline void ehn_desc_rx_set_on_chain(struct dma_desc *p)
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{
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p->des1 |= cpu_to_le32(ERDES1_SECOND_ADDRESS_CHAINED);
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}
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static inline void enh_desc_end_tx_desc_on_chain(struct dma_desc *p)
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{
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p->des0 |= cpu_to_le32(ETDES0_SECOND_ADDRESS_CHAINED);
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}
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static inline void enh_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
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{
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p->des1 |= cpu_to_le32(len & ETDES1_BUFFER1_SIZE_MASK);
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}
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/* Normal descriptors */
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static inline void ndesc_rx_set_on_chain(struct dma_desc *p, int end)
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{
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p->des1 |= cpu_to_le32(RDES1_SECOND_ADDRESS_CHAINED);
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}
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static inline void ndesc_tx_set_on_chain(struct dma_desc *p)
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{
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p->des1 |= cpu_to_le32(TDES1_SECOND_ADDRESS_CHAINED);
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}
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static inline void norm_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
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{
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p->des1 |= cpu_to_le32(len & TDES1_BUFFER1_SIZE_MASK);
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}
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#endif /* __DESC_COM_H__ */
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