126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
/*******************************************************************************
|
|
Header File to describe Normal/enhanced descriptor functions used for RING
|
|
and CHAINED modes.
|
|
|
|
Copyright(C) 2011 STMicroelectronics Ltd
|
|
|
|
It defines all the functions used to handle the normal/enhanced
|
|
descriptors in case of the DMA is configured to work in chained or
|
|
in ring mode.
|
|
|
|
This program is free software; you can redistribute it and/or modify it
|
|
under the terms and conditions of the GNU General Public License,
|
|
version 2, as published by the Free Software Foundation.
|
|
|
|
This program is distributed in the hope it will be useful, but WITHOUT
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
more details.
|
|
|
|
The full GNU General Public License is included in this distribution in
|
|
the file called "COPYING".
|
|
|
|
Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
|
|
*******************************************************************************/
|
|
|
|
#ifndef __DESC_COM_H__
|
|
#define __DESC_COM_H__
|
|
|
|
/* Specific functions used for Ring mode */
|
|
|
|
/* Enhanced descriptors */
|
|
static inline void ehn_desc_rx_set_on_ring(struct dma_desc *p, int end)
|
|
{
|
|
p->des1 |= cpu_to_le32(((BUF_SIZE_8KiB - 1)
|
|
<< ERDES1_BUFFER2_SIZE_SHIFT)
|
|
& ERDES1_BUFFER2_SIZE_MASK);
|
|
|
|
if (end)
|
|
p->des1 |= cpu_to_le32(ERDES1_END_RING);
|
|
}
|
|
|
|
static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int end)
|
|
{
|
|
if (end)
|
|
p->des0 |= cpu_to_le32(ETDES0_END_RING);
|
|
else
|
|
p->des0 &= cpu_to_le32(~ETDES0_END_RING);
|
|
}
|
|
|
|
static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
|
|
{
|
|
if (unlikely(len > BUF_SIZE_4KiB)) {
|
|
p->des1 |= cpu_to_le32((((len - BUF_SIZE_4KiB)
|
|
<< ETDES1_BUFFER2_SIZE_SHIFT)
|
|
& ETDES1_BUFFER2_SIZE_MASK) | (BUF_SIZE_4KiB
|
|
& ETDES1_BUFFER1_SIZE_MASK));
|
|
} else
|
|
p->des1 |= cpu_to_le32((len & ETDES1_BUFFER1_SIZE_MASK));
|
|
}
|
|
|
|
/* Normal descriptors */
|
|
static inline void ndesc_rx_set_on_ring(struct dma_desc *p, int end)
|
|
{
|
|
p->des1 |= cpu_to_le32(((BUF_SIZE_2KiB - 1)
|
|
<< RDES1_BUFFER2_SIZE_SHIFT)
|
|
& RDES1_BUFFER2_SIZE_MASK);
|
|
|
|
if (end)
|
|
p->des1 |= cpu_to_le32(RDES1_END_RING);
|
|
}
|
|
|
|
static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int end)
|
|
{
|
|
if (end)
|
|
p->des1 |= cpu_to_le32(TDES1_END_RING);
|
|
else
|
|
p->des1 &= cpu_to_le32(~TDES1_END_RING);
|
|
}
|
|
|
|
static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
|
|
{
|
|
if (unlikely(len > BUF_SIZE_2KiB)) {
|
|
unsigned int buffer1 = (BUF_SIZE_2KiB - 1)
|
|
& TDES1_BUFFER1_SIZE_MASK;
|
|
p->des1 |= cpu_to_le32((((len - buffer1)
|
|
<< TDES1_BUFFER2_SIZE_SHIFT)
|
|
& TDES1_BUFFER2_SIZE_MASK) | buffer1);
|
|
} else
|
|
p->des1 |= cpu_to_le32((len & TDES1_BUFFER1_SIZE_MASK));
|
|
}
|
|
|
|
/* Specific functions used for Chain mode */
|
|
|
|
/* Enhanced descriptors */
|
|
static inline void ehn_desc_rx_set_on_chain(struct dma_desc *p)
|
|
{
|
|
p->des1 |= cpu_to_le32(ERDES1_SECOND_ADDRESS_CHAINED);
|
|
}
|
|
|
|
static inline void enh_desc_end_tx_desc_on_chain(struct dma_desc *p)
|
|
{
|
|
p->des0 |= cpu_to_le32(ETDES0_SECOND_ADDRESS_CHAINED);
|
|
}
|
|
|
|
static inline void enh_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
|
|
{
|
|
p->des1 |= cpu_to_le32(len & ETDES1_BUFFER1_SIZE_MASK);
|
|
}
|
|
|
|
/* Normal descriptors */
|
|
static inline void ndesc_rx_set_on_chain(struct dma_desc *p, int end)
|
|
{
|
|
p->des1 |= cpu_to_le32(RDES1_SECOND_ADDRESS_CHAINED);
|
|
}
|
|
|
|
static inline void ndesc_tx_set_on_chain(struct dma_desc *p)
|
|
{
|
|
p->des1 |= cpu_to_le32(TDES1_SECOND_ADDRESS_CHAINED);
|
|
}
|
|
|
|
static inline void norm_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
|
|
{
|
|
p->des1 |= cpu_to_le32(len & TDES1_BUFFER1_SIZE_MASK);
|
|
}
|
|
#endif /* __DESC_COM_H__ */
|