| /* 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__ */ |
