2011-10-18 08:01:24 +08:00
|
|
|
/*******************************************************************************
|
|
|
|
Specialised functions for managing Ring mode
|
|
|
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
|
|
this program; if not, write to the Free Software Foundation, Inc.,
|
|
|
|
51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
|
|
|
|
|
|
|
The full GNU General Public License is included in this distribution in
|
|
|
|
the file called "COPYING".
|
|
|
|
|
|
|
|
Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
|
|
|
|
*******************************************************************************/
|
|
|
|
|
|
|
|
#include "stmmac.h"
|
|
|
|
|
2014-08-27 17:27:00 +08:00
|
|
|
static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
|
2011-10-18 08:01:24 +08:00
|
|
|
{
|
2013-04-08 10:10:01 +08:00
|
|
|
struct stmmac_priv *priv = (struct stmmac_priv *)p;
|
2016-02-29 21:27:30 +08:00
|
|
|
unsigned int entry = priv->cur_tx;
|
2013-08-08 14:30:26 +08:00
|
|
|
struct dma_desc *desc;
|
2011-10-18 08:01:24 +08:00
|
|
|
unsigned int nopaged_len = skb_headlen(skb);
|
|
|
|
unsigned int bmax, len;
|
|
|
|
|
2013-08-08 14:30:26 +08:00
|
|
|
if (priv->extend_desc)
|
|
|
|
desc = (struct dma_desc *)(priv->dma_etx + entry);
|
|
|
|
else
|
|
|
|
desc = priv->dma_tx + entry;
|
|
|
|
|
2011-10-18 08:01:24 +08:00
|
|
|
if (priv->plat->enh_desc)
|
|
|
|
bmax = BUF_SIZE_8KiB;
|
|
|
|
else
|
|
|
|
bmax = BUF_SIZE_2KiB;
|
|
|
|
|
|
|
|
len = nopaged_len - bmax;
|
|
|
|
|
|
|
|
if (nopaged_len > BUF_SIZE_8KiB) {
|
|
|
|
|
|
|
|
desc->des2 = dma_map_single(priv->device, skb->data,
|
|
|
|
bmax, DMA_TO_DEVICE);
|
2014-08-27 17:27:00 +08:00
|
|
|
if (dma_mapping_error(priv->device, desc->des2))
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
priv->tx_skbuff_dma[entry].buf = desc->des2;
|
2011-10-18 08:01:24 +08:00
|
|
|
desc->des3 = desc->des2 + BUF_SIZE_4KiB;
|
2013-03-26 12:43:05 +08:00
|
|
|
priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum,
|
|
|
|
STMMAC_RING_MODE);
|
2012-07-09 05:14:46 +08:00
|
|
|
wmb();
|
2014-01-17 23:47:59 +08:00
|
|
|
priv->tx_skbuff[entry] = NULL;
|
2016-02-29 21:27:30 +08:00
|
|
|
entry = STMMAC_GET_ENTRY(entry, DMA_TX_SIZE);
|
2013-08-08 14:30:26 +08:00
|
|
|
|
|
|
|
if (priv->extend_desc)
|
|
|
|
desc = (struct dma_desc *)(priv->dma_etx + entry);
|
|
|
|
else
|
|
|
|
desc = priv->dma_tx + entry;
|
2011-10-18 08:01:24 +08:00
|
|
|
|
|
|
|
desc->des2 = dma_map_single(priv->device, skb->data + bmax,
|
|
|
|
len, DMA_TO_DEVICE);
|
2014-08-27 17:27:00 +08:00
|
|
|
if (dma_mapping_error(priv->device, desc->des2))
|
|
|
|
return -1;
|
|
|
|
priv->tx_skbuff_dma[entry].buf = desc->des2;
|
2011-10-18 08:01:24 +08:00
|
|
|
desc->des3 = desc->des2 + BUF_SIZE_4KiB;
|
2013-03-26 12:43:05 +08:00
|
|
|
priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
|
|
|
|
STMMAC_RING_MODE);
|
2012-07-09 05:14:46 +08:00
|
|
|
wmb();
|
2011-10-18 08:01:24 +08:00
|
|
|
priv->hw->desc->set_tx_owner(desc);
|
|
|
|
} else {
|
|
|
|
desc->des2 = dma_map_single(priv->device, skb->data,
|
|
|
|
nopaged_len, DMA_TO_DEVICE);
|
2014-08-27 17:27:00 +08:00
|
|
|
if (dma_mapping_error(priv->device, desc->des2))
|
|
|
|
return -1;
|
|
|
|
priv->tx_skbuff_dma[entry].buf = desc->des2;
|
2011-10-18 08:01:24 +08:00
|
|
|
desc->des3 = desc->des2 + BUF_SIZE_4KiB;
|
2013-03-26 12:43:05 +08:00
|
|
|
priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len, csum,
|
|
|
|
STMMAC_RING_MODE);
|
2011-10-18 08:01:24 +08:00
|
|
|
}
|
|
|
|
|
2016-02-29 21:27:30 +08:00
|
|
|
priv->cur_tx = entry;
|
|
|
|
|
2011-10-18 08:01:24 +08:00
|
|
|
return entry;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int stmmac_is_jumbo_frm(int len, int enh_desc)
|
|
|
|
{
|
|
|
|
unsigned int ret = 0;
|
|
|
|
|
|
|
|
if (len >= BUF_SIZE_4KiB)
|
|
|
|
ret = 1;
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2013-03-26 12:43:10 +08:00
|
|
|
static void stmmac_refill_desc3(void *priv_ptr, struct dma_desc *p)
|
2011-10-18 08:01:24 +08:00
|
|
|
{
|
2013-03-26 12:43:10 +08:00
|
|
|
struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr;
|
|
|
|
|
2014-03-10 20:40:33 +08:00
|
|
|
/* Fill DES3 in case of RING mode */
|
|
|
|
if (priv->dma_buf_sz >= BUF_SIZE_8KiB)
|
|
|
|
p->des3 = p->des2 + BUF_SIZE_8KiB;
|
2011-10-18 08:01:24 +08:00
|
|
|
}
|
|
|
|
|
2013-03-26 12:43:05 +08:00
|
|
|
/* In ring mode we need to fill the desc3 because it is used as buffer */
|
|
|
|
static void stmmac_init_desc3(struct dma_desc *p)
|
2011-10-18 08:01:24 +08:00
|
|
|
{
|
2013-03-26 12:43:05 +08:00
|
|
|
p->des3 = p->des2 + BUF_SIZE_8KiB;
|
2011-10-18 08:01:24 +08:00
|
|
|
}
|
|
|
|
|
2013-03-26 12:43:10 +08:00
|
|
|
static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p)
|
2011-10-18 08:01:24 +08:00
|
|
|
{
|
|
|
|
if (unlikely(p->des3))
|
|
|
|
p->des3 = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int stmmac_set_16kib_bfsize(int mtu)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
if (unlikely(mtu >= BUF_SIZE_8KiB))
|
|
|
|
ret = BUF_SIZE_16KiB;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2014-03-10 20:40:33 +08:00
|
|
|
const struct stmmac_mode_ops ring_mode_ops = {
|
2011-10-18 08:01:24 +08:00
|
|
|
.is_jumbo_frm = stmmac_is_jumbo_frm,
|
|
|
|
.jumbo_frm = stmmac_jumbo_frm,
|
|
|
|
.refill_desc3 = stmmac_refill_desc3,
|
|
|
|
.init_desc3 = stmmac_init_desc3,
|
|
|
|
.clean_desc3 = stmmac_clean_desc3,
|
|
|
|
.set_16kib_bfsize = stmmac_set_16kib_bfsize,
|
|
|
|
};
|