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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | // SPDX-License-Identifier: GPL-2.0-only /******************************************************************************* Specialised functions for managing Chained 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. Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> *******************************************************************************/ #include "stmmac.h" static int jumbo_frm(void *p, struct sk_buff *skb, int csum) { struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)p; unsigned int nopaged_len = skb_headlen(skb); struct stmmac_priv *priv = tx_q->priv_data; unsigned int entry = tx_q->cur_tx; unsigned int bmax, des2; unsigned int i = 1, len; struct dma_desc *desc; desc = tx_q->dma_tx + entry; if (priv->plat->enh_desc) bmax = BUF_SIZE_8KiB; else bmax = BUF_SIZE_2KiB; len = nopaged_len - bmax; des2 = dma_map_single(priv->device, skb->data, bmax, DMA_TO_DEVICE); desc->des2 = cpu_to_le32(des2); if (dma_mapping_error(priv->device, des2)) return -1; tx_q->tx_skbuff_dma[entry].buf = des2; tx_q->tx_skbuff_dma[entry].len = bmax; /* do not close the descriptor and do not set own bit */ stmmac_prepare_tx_desc(priv, desc, 1, bmax, csum, STMMAC_CHAIN_MODE, 0, false, skb->len); while (len != 0) { tx_q->tx_skbuff[entry] = NULL; entry = STMMAC_GET_ENTRY(entry, priv->dma_conf.dma_tx_size); desc = tx_q->dma_tx + entry; if (len > bmax) { des2 = dma_map_single(priv->device, (skb->data + bmax * i), bmax, DMA_TO_DEVICE); desc->des2 = cpu_to_le32(des2); if (dma_mapping_error(priv->device, des2)) return -1; tx_q->tx_skbuff_dma[entry].buf = des2; tx_q->tx_skbuff_dma[entry].len = bmax; stmmac_prepare_tx_desc(priv, desc, 0, bmax, csum, STMMAC_CHAIN_MODE, 1, false, skb->len); len -= bmax; i++; } else { des2 = dma_map_single(priv->device, (skb->data + bmax * i), len, DMA_TO_DEVICE); desc->des2 = cpu_to_le32(des2); if (dma_mapping_error(priv->device, des2)) return -1; tx_q->tx_skbuff_dma[entry].buf = des2; tx_q->tx_skbuff_dma[entry].len = len; /* last descriptor can be set now */ stmmac_prepare_tx_desc(priv, desc, 0, len, csum, STMMAC_CHAIN_MODE, 1, true, skb->len); len = 0; } } tx_q->cur_tx = entry; return entry; } static unsigned int is_jumbo_frm(int len, int enh_desc) { unsigned int ret = 0; if ((enh_desc && (len > BUF_SIZE_8KiB)) || (!enh_desc && (len > BUF_SIZE_2KiB))) { ret = 1; } return ret; } static void init_dma_chain(void *des, dma_addr_t phy_addr, unsigned int size, unsigned int extend_desc) { /* * In chained mode the des3 points to the next element in the ring. * The latest element has to point to the head. */ int i; dma_addr_t dma_phy = phy_addr; if (extend_desc) { struct dma_extended_desc *p = (struct dma_extended_desc *)des; for (i = 0; i < (size - 1); i++) { dma_phy += sizeof(struct dma_extended_desc); p->basic.des3 = cpu_to_le32((unsigned int)dma_phy); p++; } p->basic.des3 = cpu_to_le32((unsigned int)phy_addr); } else { struct dma_desc *p = (struct dma_desc *)des; for (i = 0; i < (size - 1); i++) { dma_phy += sizeof(struct dma_desc); p->des3 = cpu_to_le32((unsigned int)dma_phy); p++; } p->des3 = cpu_to_le32((unsigned int)phy_addr); } } static void refill_desc3(void *priv_ptr, struct dma_desc *p) { struct stmmac_rx_queue *rx_q = (struct stmmac_rx_queue *)priv_ptr; struct stmmac_priv *priv = rx_q->priv_data; if (priv->hwts_rx_en && !priv->extend_desc) /* NOTE: Device will overwrite des3 with timestamp value if * 1588-2002 time stamping is enabled, hence reinitialize it * to keep explicit chaining in the descriptor. */ p->des3 = cpu_to_le32((unsigned int)(rx_q->dma_rx_phy + (((rx_q->dirty_rx) + 1) % priv->dma_conf.dma_rx_size) * sizeof(struct dma_desc))); } static void clean_desc3(void *priv_ptr, struct dma_desc *p) { struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)priv_ptr; struct stmmac_priv *priv = tx_q->priv_data; unsigned int entry = tx_q->dirty_tx; if (tx_q->tx_skbuff_dma[entry].last_segment && !priv->extend_desc && priv->hwts_tx_en) /* NOTE: Device will overwrite des3 with timestamp value if * 1588-2002 time stamping is enabled, hence reinitialize it * to keep explicit chaining in the descriptor. */ p->des3 = cpu_to_le32((unsigned int)((tx_q->dma_tx_phy + ((tx_q->dirty_tx + 1) % priv->dma_conf.dma_tx_size)) * sizeof(struct dma_desc))); } const struct stmmac_mode_ops chain_mode_ops = { .init = init_dma_chain, .is_jumbo_frm = is_jumbo_frm, .jumbo_frm = jumbo_frm, .refill_desc3 = refill_desc3, .clean_desc3 = clean_desc3, }; |