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  You should have received a copy of the GNU General Public License along with
 21  this program; if not, write to the Free Software Foundation, Inc.,
 22  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 23
 24  The full GNU General Public License is included in this distribution in
 25  the file called "COPYING".
 26
 27  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
 28*******************************************************************************/
 29
 30#if defined(CONFIG_STMMAC_RING)
 31static inline void ehn_desc_rx_set_on_ring_chain(struct dma_desc *p, int end)
 32{
 33	p->des01.erx.buffer2_size = BUF_SIZE_8KiB - 1;
 34	if (end)
 35		p->des01.erx.end_ring = 1;
 36}
 37
 38static inline void ehn_desc_tx_set_on_ring_chain(struct dma_desc *p, int end)
 39{
 40	if (end)
 41		p->des01.etx.end_ring = 1;
 42}
 43
 44static inline void enh_desc_end_tx_desc(struct dma_desc *p, int ter)
 45{
 46	p->des01.etx.end_ring = ter;
 47}
 48
 49static inline void enh_set_tx_desc_len(struct dma_desc *p, int len)
 50{
 51	if (unlikely(len > BUF_SIZE_4KiB)) {
 52		p->des01.etx.buffer1_size = BUF_SIZE_4KiB;
 53		p->des01.etx.buffer2_size = len - BUF_SIZE_4KiB;
 54	} else
 55		p->des01.etx.buffer1_size = len;
 56}
 57
 58static inline void ndesc_rx_set_on_ring_chain(struct dma_desc *p, int end)
 59{
 60	p->des01.rx.buffer2_size = BUF_SIZE_2KiB - 1;
 61	if (end)
 62		p->des01.rx.end_ring = 1;
 63}
 64
 65static inline void ndesc_tx_set_on_ring_chain(struct dma_desc *p, int end)
 66{
 67	if (end)
 68		p->des01.tx.end_ring = 1;
 69}
 70
 71static inline void ndesc_end_tx_desc(struct dma_desc *p, int ter)
 72{
 73	p->des01.tx.end_ring = ter;
 74}
 75
 76static inline void norm_set_tx_desc_len(struct dma_desc *p, int len)
 77{
 78	if (unlikely(len > BUF_SIZE_2KiB)) {
 79		p->des01.etx.buffer1_size = BUF_SIZE_2KiB - 1;
 80		p->des01.etx.buffer2_size = len - p->des01.etx.buffer1_size;
 81	} else
 82		p->des01.tx.buffer1_size = len;
 83}
 84
 85#else
 86
 87static inline void ehn_desc_rx_set_on_ring_chain(struct dma_desc *p, int end)
 88{
 89	p->des01.erx.second_address_chained = 1;
 90}
 91
 92static inline void ehn_desc_tx_set_on_ring_chain(struct dma_desc *p, int end)
 93{
 94	p->des01.etx.second_address_chained = 1;
 95}
 96
 97static inline void enh_desc_end_tx_desc(struct dma_desc *p, int ter)
 98{
 99	p->des01.etx.second_address_chained = 1;
100}
101
102static inline void enh_set_tx_desc_len(struct dma_desc *p, int len)
103{
104	p->des01.etx.buffer1_size = len;
105}
106
107static inline void ndesc_rx_set_on_ring_chain(struct dma_desc *p, int end)
108{
109	p->des01.rx.second_address_chained = 1;
110}
111
112static inline void ndesc_tx_set_on_ring_chain(struct dma_desc *p, int ring_size)
113{
114	p->des01.tx.second_address_chained = 1;
115}
116
117static inline void ndesc_end_tx_desc(struct dma_desc *p, int ter)
118{
119	p->des01.tx.second_address_chained = 1;
120}
121
122static inline void norm_set_tx_desc_len(struct dma_desc *p, int len)
123{
124	p->des01.tx.buffer1_size = len;
125}
126#endif