drivers/net/ethernet/stmicro/stmmac/descs_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   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 #ifndef __DESC_COM_H__
  31 #define __DESC_COM_H__
  32
  33 /* Specific functions used for Ring mode */
  34
  35 /* Enhanced descriptors */
  36 static inline void ehn_desc_rx_set_on_ring(struct dma_desc *p, int end)
  37 {
  38         p->des01.erx.buffer2_size = BUF_SIZE_8KiB - 1;
  39         if (end)
  40                 p->des01.erx.end_ring = 1;
  41 }
  42
  43 static inline void ehn_desc_tx_set_on_ring(struct dma_desc *p, int end)
  44 {
  45         if (end)
  46                 p->des01.etx.end_ring = 1;
  47 }
  48
  49 static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int ter)
  50 {
  51         p->des01.etx.end_ring = ter;
  52 }
  53
  54 static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
  55 {
  56         if (unlikely(len > BUF_SIZE_4KiB)) {
  57                 p->des01.etx.buffer1_size = BUF_SIZE_4KiB;
  58                 p->des01.etx.buffer2_size = len - BUF_SIZE_4KiB;
  59         } else
  60                 p->des01.etx.buffer1_size = len;
  61 }
  62
  63 /* Normal descriptors */
  64 static inline void ndesc_rx_set_on_ring(struct dma_desc *p, int end)
  65 {
  66         p->des01.rx.buffer2_size = BUF_SIZE_2KiB - 1;
  67         if (end)
  68                 p->des01.rx.end_ring = 1;
  69 }
  70
  71 static inline void ndesc_tx_set_on_ring(struct dma_desc *p, int end)
  72 {
  73         if (end)
  74                 p->des01.tx.end_ring = 1;
  75 }
  76
  77 static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int ter)
  78 {
  79         p->des01.tx.end_ring = ter;
  80 }
  81
  82 static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
  83 {
  84         if (unlikely(len > BUF_SIZE_2KiB)) {
  85                 p->des01.etx.buffer1_size = BUF_SIZE_2KiB - 1;
  86                 p->des01.etx.buffer2_size = len - p->des01.etx.buffer1_size;
  87         } else
  88                 p->des01.tx.buffer1_size = len;
  89 }
  90
  91 /* Specific functions used for Chain mode */
  92
  93 /* Enhanced descriptors */
  94 static inline void ehn_desc_rx_set_on_chain(struct dma_desc *p, int end)
  95 {
  96         p->des01.erx.second_address_chained = 1;
  97 }
  98
  99 static inline void ehn_desc_tx_set_on_chain(struct dma_desc *p, int end)
 100 {
 101         p->des01.etx.second_address_chained = 1;
 102 }
 103
 104 static inline void enh_desc_end_tx_desc_on_chain(struct dma_desc *p, int ter)
 105 {
 106         p->des01.etx.second_address_chained = 1;
 107 }
 108
 109 static inline void enh_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
 110 {
 111         p->des01.etx.buffer1_size = len;
 112 }
 113
 114 /* Normal descriptors */
 115 static inline void ndesc_rx_set_on_chain(struct dma_desc *p, int end)
 116 {
 117         p->des01.rx.second_address_chained = 1;
 118 }
 119
 120 static inline void ndesc_tx_set_on_chain(struct dma_desc *p, int ring_size)
 121 {
 122         p->des01.tx.second_address_chained = 1;
 123 }
 124
 125 static inline void ndesc_end_tx_desc_on_chain(struct dma_desc *p, int ter)
 126 {
 127         p->des01.tx.second_address_chained = 1;
 128 }
 129
 130 static inline void norm_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
 131 {
 132         p->des01.tx.buffer1_size = len;
 133 }
 134 #endif /* __DESC_COM_H__ */