c24602ef86
This patch is to support the extend descriptors available in the chips newer than the 3.50. In case of the extend descriptors cannot be supported, at runtime, the driver will continue to work using the old style. In detail, this support extends the main descriptor structure adding new descriptors: 4, 5, 6, 7. The desc4 gives us extra information about the received ethernet payload when it is carrying PTP packets or TCP/UDP/ICMP over IP packets. The descriptors 6 and 7 are used for saving HW L/H timestamps (PTP). V2: this new version removes the Koption added in the first implementation because all the checks now to verify if the extended descriptors are actually supported happen at probe time. Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: David S. Miller <davem@davemloft.net>
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*******************************************************************************
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Specialised functions for managing Chained mode
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Copyright(C) 2011 STMicroelectronics Ltd
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It defines all the functions used to handle the normal/enhanced
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descriptors in case of the DMA is configured to work in chained or
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in ring mode.
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*******************************************************************************/
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#include "stmmac.h"
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static unsigned int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
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{
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struct stmmac_priv *priv = (struct stmmac_priv *) p;
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unsigned int txsize = priv->dma_tx_size;
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unsigned int entry = priv->cur_tx % txsize;
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struct dma_desc *desc = priv->dma_tx + entry;
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unsigned int nopaged_len = skb_headlen(skb);
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unsigned int bmax;
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unsigned int i = 1, len;
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if (priv->plat->enh_desc)
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bmax = BUF_SIZE_8KiB;
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else
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bmax = BUF_SIZE_2KiB;
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len = nopaged_len - bmax;
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desc->des2 = dma_map_single(priv->device, skb->data,
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bmax, DMA_TO_DEVICE);
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priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum, STMMAC_CHAIN_MODE);
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while (len != 0) {
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entry = (++priv->cur_tx) % txsize;
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desc = priv->dma_tx + entry;
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if (len > bmax) {
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desc->des2 = dma_map_single(priv->device,
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(skb->data + bmax * i),
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bmax, DMA_TO_DEVICE);
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priv->hw->desc->prepare_tx_desc(desc, 0, bmax, csum,
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STMMAC_CHAIN_MODE);
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priv->hw->desc->set_tx_owner(desc);
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priv->tx_skbuff[entry] = NULL;
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len -= bmax;
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i++;
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} else {
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desc->des2 = dma_map_single(priv->device,
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(skb->data + bmax * i), len,
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DMA_TO_DEVICE);
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priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
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STMMAC_CHAIN_MODE);
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priv->hw->desc->set_tx_owner(desc);
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priv->tx_skbuff[entry] = NULL;
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len = 0;
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}
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}
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return entry;
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}
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static unsigned int stmmac_is_jumbo_frm(int len, int enh_desc)
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{
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unsigned int ret = 0;
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if ((enh_desc && (len > BUF_SIZE_8KiB)) ||
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(!enh_desc && (len > BUF_SIZE_2KiB))) {
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ret = 1;
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}
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return ret;
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}
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static void stmmac_init_dma_chain(void *des, dma_addr_t phy_addr,
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unsigned int size, unsigned int extend_desc)
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{
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/*
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* In chained mode the des3 points to the next element in the ring.
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* The latest element has to point to the head.
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*/
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int i;
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dma_addr_t dma_phy = phy_addr;
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if (extend_desc) {
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struct dma_extended_desc *p = (struct dma_extended_desc *) des;
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for (i = 0; i < (size - 1); i++) {
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dma_phy += sizeof(struct dma_extended_desc);
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p->basic.des3 = (unsigned int)dma_phy;
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p++;
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}
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p->basic.des3 = (unsigned int)phy_addr;
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} else {
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struct dma_desc *p = (struct dma_desc *) des;
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for (i = 0; i < (size - 1); i++) {
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dma_phy += sizeof(struct dma_desc);
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p->des3 = (unsigned int)dma_phy;
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p++;
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}
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p->des3 = (unsigned int)phy_addr;
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}
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}
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const struct stmmac_chain_mode_ops chain_mode_ops = {
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.init = stmmac_init_dma_chain,
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.is_jumbo_frm = stmmac_is_jumbo_frm,
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.jumbo_frm = stmmac_jumbo_frm,
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};
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