1 /******************************************************************************* 2 Header File to describe Normal/enhanced descriptor functions used for RING 3 and CHAINED modes. 4 5 Copyright(C) 2011 STMicroelectronics Ltd 6 7 It defines all the functions used to handle the normal/enhanced 8 descriptors in case of the DMA is configured to work in chained or 9 in ring mode. 10 11 This program is free software; you can redistribute it and/or modify it 12 under the terms and conditions of the GNU General Public License, 13 version 2, as published by the Free Software Foundation. 14 15 This program is distributed in the hope it will be useful, but WITHOUT 16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 18 more details. 19 20 The full GNU General Public License is included in this distribution in 21 the file called "COPYING". 22 23 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> 24 *******************************************************************************/ 25 26 #ifndef __DESC_COM_H__ 27 #define __DESC_COM_H__ 28 29 /* Specific functions used for Ring mode */ 30 31 /* Enhanced descriptors */ 32 static inline void ehn_desc_rx_set_on_ring(struct dma_desc *p, int end) 33 { 34 p->des1 |= cpu_to_le32(((BUF_SIZE_8KiB - 1) 35 << ERDES1_BUFFER2_SIZE_SHIFT) 36 & ERDES1_BUFFER2_SIZE_MASK); 37 38 if (end) 39 p->des1 |= cpu_to_le32(ERDES1_END_RING); 40 } 41 42 static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int end) 43 { 44 if (end) 45 p->des0 |= cpu_to_le32(ETDES0_END_RING); 46 else 47 p->des0 &= cpu_to_le32(~ETDES0_END_RING); 48 } 49 50 static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len) 51 { 52 if (unlikely(len > BUF_SIZE_4KiB)) { 53 p->des1 |= cpu_to_le32((((len - BUF_SIZE_4KiB) 54 << ETDES1_BUFFER2_SIZE_SHIFT) 55 & ETDES1_BUFFER2_SIZE_MASK) | (BUF_SIZE_4KiB 56 & ETDES1_BUFFER1_SIZE_MASK)); 57 } else 58 p->des1 |= cpu_to_le32((len & ETDES1_BUFFER1_SIZE_MASK)); 59 } 60 61 /* Normal descriptors */ 62 static inline void ndesc_rx_set_on_ring(struct dma_desc *p, int end) 63 { 64 p->des1 |= cpu_to_le32(((BUF_SIZE_2KiB - 1) 65 << RDES1_BUFFER2_SIZE_SHIFT) 66 & RDES1_BUFFER2_SIZE_MASK); 67 68 if (end) 69 p->des1 |= cpu_to_le32(RDES1_END_RING); 70 } 71 72 static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int end) 73 { 74 if (end) 75 p->des1 |= cpu_to_le32(TDES1_END_RING); 76 else 77 p->des1 &= cpu_to_le32(~TDES1_END_RING); 78 } 79 80 static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len) 81 { 82 if (unlikely(len > BUF_SIZE_2KiB)) { 83 unsigned int buffer1 = (BUF_SIZE_2KiB - 1) 84 & TDES1_BUFFER1_SIZE_MASK; 85 p->des1 |= cpu_to_le32((((len - buffer1) 86 << TDES1_BUFFER2_SIZE_SHIFT) 87 & TDES1_BUFFER2_SIZE_MASK) | buffer1); 88 } else 89 p->des1 |= cpu_to_le32((len & TDES1_BUFFER1_SIZE_MASK)); 90 } 91 92 /* Specific functions used for Chain mode */ 93 94 /* Enhanced descriptors */ 95 static inline void ehn_desc_rx_set_on_chain(struct dma_desc *p) 96 { 97 p->des1 |= cpu_to_le32(ERDES1_SECOND_ADDRESS_CHAINED); 98 } 99 100 static inline void enh_desc_end_tx_desc_on_chain(struct dma_desc *p) 101 { 102 p->des0 |= cpu_to_le32(ETDES0_SECOND_ADDRESS_CHAINED); 103 } 104 105 static inline void enh_set_tx_desc_len_on_chain(struct dma_desc *p, int len) 106 { 107 p->des1 |= cpu_to_le32(len & ETDES1_BUFFER1_SIZE_MASK); 108 } 109 110 /* Normal descriptors */ 111 static inline void ndesc_rx_set_on_chain(struct dma_desc *p, int end) 112 { 113 p->des1 |= cpu_to_le32(RDES1_SECOND_ADDRESS_CHAINED); 114 } 115 116 static inline void ndesc_tx_set_on_chain(struct dma_desc *p) 117 { 118 p->des1 |= cpu_to_le32(TDES1_SECOND_ADDRESS_CHAINED); 119 } 120 121 static inline void norm_set_tx_desc_len_on_chain(struct dma_desc *p, int len) 122 { 123 p->des1 |= cpu_to_le32(len & TDES1_BUFFER1_SIZE_MASK); 124 } 125 #endif /* __DESC_COM_H__ */ 126