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1/* SPDX-License-Identifier: GPL-2.0-only */2/*******************************************************************************3 Header File to describe Normal/enhanced descriptor functions used for RING4 and CHAINED modes.5 6 Copyright(C) 2011 STMicroelectronics Ltd7 8 It defines all the functions used to handle the normal/enhanced9 descriptors in case of the DMA is configured to work in chained or10 in ring mode.11 12 13 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>14*******************************************************************************/15 16#ifndef __DESC_COM_H__17#define __DESC_COM_H__18 19/* Specific functions used for Ring mode */20 21/* Enhanced descriptors */22static inline void ehn_desc_rx_set_on_ring(struct dma_desc *p, int end,23 int bfsize)24{25 if (bfsize == BUF_SIZE_16KiB)26 p->des1 |= cpu_to_le32((BUF_SIZE_8KiB27 << ERDES1_BUFFER2_SIZE_SHIFT)28 & ERDES1_BUFFER2_SIZE_MASK);29 30 if (end)31 p->des1 |= cpu_to_le32(ERDES1_END_RING);32}33 34static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int end)35{36 if (end)37 p->des0 |= cpu_to_le32(ETDES0_END_RING);38 else39 p->des0 &= cpu_to_le32(~ETDES0_END_RING);40}41 42static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len)43{44 if (unlikely(len > BUF_SIZE_4KiB)) {45 p->des1 |= cpu_to_le32((((len - BUF_SIZE_4KiB)46 << ETDES1_BUFFER2_SIZE_SHIFT)47 & ETDES1_BUFFER2_SIZE_MASK) | (BUF_SIZE_4KiB48 & ETDES1_BUFFER1_SIZE_MASK));49 } else50 p->des1 |= cpu_to_le32((len & ETDES1_BUFFER1_SIZE_MASK));51}52 53/* Normal descriptors */54static inline void ndesc_rx_set_on_ring(struct dma_desc *p, int end, int bfsize)55{56 if (bfsize >= BUF_SIZE_2KiB) {57 int bfsize2;58 59 bfsize2 = min(bfsize - BUF_SIZE_2KiB + 1, BUF_SIZE_2KiB - 1);60 p->des1 |= cpu_to_le32((bfsize2 << RDES1_BUFFER2_SIZE_SHIFT)61 & RDES1_BUFFER2_SIZE_MASK);62 }63 64 if (end)65 p->des1 |= cpu_to_le32(RDES1_END_RING);66}67 68static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int end)69{70 if (end)71 p->des1 |= cpu_to_le32(TDES1_END_RING);72 else73 p->des1 &= cpu_to_le32(~TDES1_END_RING);74}75 76static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len)77{78 if (unlikely(len > BUF_SIZE_2KiB)) {79 unsigned int buffer1 = (BUF_SIZE_2KiB - 1)80 & TDES1_BUFFER1_SIZE_MASK;81 p->des1 |= cpu_to_le32((((len - buffer1)82 << TDES1_BUFFER2_SIZE_SHIFT)83 & TDES1_BUFFER2_SIZE_MASK) | buffer1);84 } else85 p->des1 |= cpu_to_le32((len & TDES1_BUFFER1_SIZE_MASK));86}87 88/* Specific functions used for Chain mode */89 90/* Enhanced descriptors */91static inline void ehn_desc_rx_set_on_chain(struct dma_desc *p)92{93 p->des1 |= cpu_to_le32(ERDES1_SECOND_ADDRESS_CHAINED);94}95 96static inline void enh_desc_end_tx_desc_on_chain(struct dma_desc *p)97{98 p->des0 |= cpu_to_le32(ETDES0_SECOND_ADDRESS_CHAINED);99}100 101static inline void enh_set_tx_desc_len_on_chain(struct dma_desc *p, int len)102{103 p->des1 |= cpu_to_le32(len & ETDES1_BUFFER1_SIZE_MASK);104}105 106/* Normal descriptors */107static inline void ndesc_rx_set_on_chain(struct dma_desc *p, int end)108{109 p->des1 |= cpu_to_le32(RDES1_SECOND_ADDRESS_CHAINED);110}111 112static inline void ndesc_tx_set_on_chain(struct dma_desc *p)113{114 p->des1 |= cpu_to_le32(TDES1_SECOND_ADDRESS_CHAINED);115}116 117static inline void norm_set_tx_desc_len_on_chain(struct dma_desc *p, int len)118{119 p->des1 |= cpu_to_le32(len & TDES1_BUFFER1_SIZE_MASK);120}121#endif /* __DESC_COM_H__ */122