169 lines
4.8 KiB
C
169 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*******************************************************************************
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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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Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*******************************************************************************/
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#include "stmmac.h"
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static int jumbo_frm(void *p, struct sk_buff *skb, int csum)
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{
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struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)p;
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unsigned int nopaged_len = skb_headlen(skb);
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struct stmmac_priv *priv = tx_q->priv_data;
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unsigned int entry = tx_q->cur_tx;
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unsigned int bmax, des2;
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unsigned int i = 1, len;
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struct dma_desc *desc;
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desc = tx_q->dma_tx + entry;
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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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des2 = dma_map_single(priv->device, skb->data,
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bmax, DMA_TO_DEVICE);
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desc->des2 = cpu_to_le32(des2);
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if (dma_mapping_error(priv->device, des2))
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return -1;
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tx_q->tx_skbuff_dma[entry].buf = des2;
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tx_q->tx_skbuff_dma[entry].len = bmax;
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/* do not close the descriptor and do not set own bit */
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stmmac_prepare_tx_desc(priv, desc, 1, bmax, csum, STMMAC_CHAIN_MODE,
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0, false, skb->len);
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while (len != 0) {
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tx_q->tx_skbuff[entry] = NULL;
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entry = STMMAC_GET_ENTRY(entry, priv->dma_conf.dma_tx_size);
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desc = tx_q->dma_tx + entry;
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if (len > bmax) {
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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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desc->des2 = cpu_to_le32(des2);
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if (dma_mapping_error(priv->device, des2))
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return -1;
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tx_q->tx_skbuff_dma[entry].buf = des2;
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tx_q->tx_skbuff_dma[entry].len = bmax;
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stmmac_prepare_tx_desc(priv, desc, 0, bmax, csum,
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STMMAC_CHAIN_MODE, 1, false, skb->len);
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len -= bmax;
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i++;
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} else {
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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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desc->des2 = cpu_to_le32(des2);
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if (dma_mapping_error(priv->device, des2))
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return -1;
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tx_q->tx_skbuff_dma[entry].buf = des2;
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tx_q->tx_skbuff_dma[entry].len = len;
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/* last descriptor can be set now */
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stmmac_prepare_tx_desc(priv, desc, 0, len, csum,
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STMMAC_CHAIN_MODE, 1, true, skb->len);
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len = 0;
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}
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}
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tx_q->cur_tx = entry;
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return entry;
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}
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static unsigned int 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 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 = cpu_to_le32((unsigned int)dma_phy);
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p++;
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}
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p->basic.des3 = cpu_to_le32((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 = cpu_to_le32((unsigned int)dma_phy);
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p++;
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}
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p->des3 = cpu_to_le32((unsigned int)phy_addr);
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}
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}
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static void refill_desc3(void *priv_ptr, struct dma_desc *p)
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{
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struct stmmac_rx_queue *rx_q = (struct stmmac_rx_queue *)priv_ptr;
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struct stmmac_priv *priv = rx_q->priv_data;
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if (priv->hwts_rx_en && !priv->extend_desc)
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/* NOTE: Device will overwrite des3 with timestamp value if
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* 1588-2002 time stamping is enabled, hence reinitialize it
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* to keep explicit chaining in the descriptor.
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*/
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p->des3 = cpu_to_le32((unsigned int)(rx_q->dma_rx_phy +
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(((rx_q->dirty_rx) + 1) %
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priv->dma_conf.dma_rx_size) *
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sizeof(struct dma_desc)));
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}
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static void clean_desc3(void *priv_ptr, struct dma_desc *p)
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{
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struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)priv_ptr;
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struct stmmac_priv *priv = tx_q->priv_data;
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unsigned int entry = tx_q->dirty_tx;
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if (tx_q->tx_skbuff_dma[entry].last_segment && !priv->extend_desc &&
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priv->hwts_tx_en)
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/* NOTE: Device will overwrite des3 with timestamp value if
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* 1588-2002 time stamping is enabled, hence reinitialize it
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* to keep explicit chaining in the descriptor.
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*/
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p->des3 = cpu_to_le32((unsigned int)((tx_q->dma_tx_phy +
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((tx_q->dirty_tx + 1) %
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priv->dma_conf.dma_tx_size))
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* sizeof(struct dma_desc)));
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}
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const struct stmmac_mode_ops chain_mode_ops = {
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.init = init_dma_chain,
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.is_jumbo_frm = is_jumbo_frm,
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.jumbo_frm = jumbo_frm,
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.refill_desc3 = refill_desc3,
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.clean_desc3 = clean_desc3,
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};
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