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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*******************************************************************************
3 Header File to describe Normal/enhanced descriptor functions used for RING
4 and CHAINED modes.
5
6 Copyright(C) 2011 STMicroelectronics Ltd
7
8 It defines all the functions used to handle the normal/enhanced
9 descriptors in case of the DMA is configured to work in chained or
10 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_8KiB
27 << 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 else
39 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_4KiB
48 & ETDES1_BUFFER1_SIZE_MASK));
49 } else
50 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 else
73 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 } else
85 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__ */
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 */
32static 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
42static 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
50static 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 */
62static 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
72static 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
80static 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 */
95static 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
100static 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
105static 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 */
111static 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
116static inline void ndesc_tx_set_on_chain(struct dma_desc *p)
117{
118 p->des1 |= cpu_to_le32(TDES1_SECOND_ADDRESS_CHAINED);
119}
120
121static 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__ */