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brintos / linux-shallow public Read only

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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