projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 286a8372 GC |
1 | /******************************************************************************* |
| 2 | Specialised functions for managing Ring mode | |
| 3 | ||
| 4 | Copyright(C) 2011 STMicroelectronics Ltd | |
| 5 | ||
| 6 | It defines all the functions used to handle the normal/enhanced | |
| 7 | descriptors in case of the DMA is configured to work in chained or | |
| 8 | in ring mode. | |
| 9 | ||
| 10 | This program is free software; you can redistribute it and/or modify it | |
| 11 | under the terms and conditions of the GNU General Public License, | |
| 12 | version 2, as published by the Free Software Foundation. | |
| 13 | ||
| 14 | This program is distributed in the hope it will be useful, but WITHOUT | |
| 15 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 16 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 17 | more details. | |
| 18 | ||
| 19 | You should have received a copy of the GNU General Public License along with | |
| 20 | this program; if not, write to the Free Software Foundation, Inc., | |
| 21 | 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
| 22 | ||
| 23 | The full GNU General Public License is included in this distribution in | |
| 24 | the file called "COPYING". | |
| 25 | ||
| 26 | Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> | |
| 27 | *******************************************************************************/ | |
| 28 | ||
| 29 | #include "stmmac.h" | |
| 30 | ||
| 31 | static unsigned int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) | |
| 32 | { | |
| 33 | struct stmmac_priv *priv = (struct stmmac_priv *) p; | |
| 34 | unsigned int txsize = priv->dma_tx_size; | |
| 35 | unsigned int entry = priv->cur_tx % txsize; | |
| 36 | struct dma_desc *desc = priv->dma_tx + entry; | |
| 37 | unsigned int nopaged_len = skb_headlen(skb); | |
| 38 | unsigned int bmax, len; | |
| 39 | ||
| 40 | if (priv->plat->enh_desc) | |
| 41 | bmax = BUF_SIZE_8KiB; | |
| 42 | else | |
| 43 | bmax = BUF_SIZE_2KiB; | |
| 44 | ||
| 45 | len = nopaged_len - bmax; | |
| 46 | ||
| 47 | if (nopaged_len > BUF_SIZE_8KiB) { | |
| 48 | ||
| 49 | desc->des2 = dma_map_single(priv->device, skb->data, | |
| 50 | bmax, DMA_TO_DEVICE); | |
| 51 | desc->des3 = desc->des2 + BUF_SIZE_4KiB; | |
| 52 | priv->hw->desc->prepare_tx_desc(desc, 1, bmax, | |
| 53 | csum); | |
| 684901a6 | 54 | wmb(); |
| 286a8372 GC |
55 | entry = (++priv->cur_tx) % txsize; |
| 56 | desc = priv->dma_tx + entry; | |
| 57 | ||
| 58 | desc->des2 = dma_map_single(priv->device, skb->data + bmax, | |
| 59 | len, DMA_TO_DEVICE); | |
| 60 | desc->des3 = desc->des2 + BUF_SIZE_4KiB; | |
| 61 | priv->hw->desc->prepare_tx_desc(desc, 0, len, csum); | |
| 684901a6 | 62 | wmb(); |
| 286a8372 GC |
63 | priv->hw->desc->set_tx_owner(desc); |
| 64 | priv->tx_skbuff[entry] = NULL; | |
| 65 | } else { | |
| 66 | desc->des2 = dma_map_single(priv->device, skb->data, | |
| 67 | nopaged_len, DMA_TO_DEVICE); | |
| 68 | desc->des3 = desc->des2 + BUF_SIZE_4KiB; | |
| 69 | priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len, csum); | |
| 70 | } | |
| 71 | ||
| 72 | return entry; | |
| 73 | } | |
| 74 | ||
| 75 | static unsigned int stmmac_is_jumbo_frm(int len, int enh_desc) | |
| 76 | { | |
| 77 | unsigned int ret = 0; | |
| 78 | ||
| 79 | if (len >= BUF_SIZE_4KiB) | |
| 80 | ret = 1; | |
| 81 | ||
| 82 | return ret; | |
| 83 | } | |
| 84 | ||
| 85 | static void stmmac_refill_desc3(int bfsize, struct dma_desc *p) | |
| 86 | { | |
| 87 | /* Fill DES3 in case of RING mode */ | |
| 88 | if (bfsize >= BUF_SIZE_8KiB) | |
| 89 | p->des3 = p->des2 + BUF_SIZE_8KiB; | |
| 90 | } | |
| 91 | ||
| 92 | /* In ring mode we need to fill the desc3 because it is used | |
| 93 | * as buffer */ | |
| 94 | static void stmmac_init_desc3(int des3_as_data_buf, struct dma_desc *p) | |
| 95 | { | |
| 96 | if (unlikely(des3_as_data_buf)) | |
| 97 | p->des3 = p->des2 + BUF_SIZE_8KiB; | |
| 98 | } | |
| 99 | ||
| 100 | static void stmmac_init_dma_chain(struct dma_desc *des, dma_addr_t phy_addr, | |
| 101 | unsigned int size) | |
| 102 | { | |
| 103 | } | |
| 104 | ||
| 105 | static void stmmac_clean_desc3(struct dma_desc *p) | |
| 106 | { | |
| 107 | if (unlikely(p->des3)) | |
| 108 | p->des3 = 0; | |
| 109 | } | |
| 110 | ||
| 111 | static int stmmac_set_16kib_bfsize(int mtu) | |
| 112 | { | |
| 113 | int ret = 0; | |
| 114 | if (unlikely(mtu >= BUF_SIZE_8KiB)) | |
| 115 | ret = BUF_SIZE_16KiB; | |
| 116 | return ret; | |
| 117 | } | |
| 118 | ||
| 119 | const struct stmmac_ring_mode_ops ring_mode_ops = { | |
| 120 | .is_jumbo_frm = stmmac_is_jumbo_frm, | |
| 121 | .jumbo_frm = stmmac_jumbo_frm, | |
| 122 | .refill_desc3 = stmmac_refill_desc3, | |
| 123 | .init_desc3 = stmmac_init_desc3, | |
| 124 | .init_dma_chain = stmmac_init_dma_chain, | |
| 125 | .clean_desc3 = stmmac_clean_desc3, | |
| 126 | .set_16kib_bfsize = stmmac_set_16kib_bfsize, | |
| 127 | }; |