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- /*******************************************************************************
- 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.
- 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.
- The full GNU General Public License is included in this distribution in
- the file called "COPYING".
- 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__ */
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