1 /*
2 * Applied Micro X-Gene SoC Ethernet v2 Driver
3 *
4 * Copyright (c) 2017, Applied Micro Circuits Corporation
5 * Author(s): Iyappan Subramanian <isubramanian@apm.com>
6 * Keyur Chudgar <kchudgar@apm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "main.h"
23
24 /* create circular linked list of descriptors */
xge_setup_desc(struct xge_desc_ring * ring)25 void xge_setup_desc(struct xge_desc_ring *ring)
26 {
27 struct xge_raw_desc *raw_desc;
28 dma_addr_t dma_h, next_dma;
29 u16 offset;
30 int i;
31
32 for (i = 0; i < XGENE_ENET_NUM_DESC; i++) {
33 raw_desc = &ring->raw_desc[i];
34
35 offset = (i + 1) & (XGENE_ENET_NUM_DESC - 1);
36 next_dma = ring->dma_addr + (offset * XGENE_ENET_DESC_SIZE);
37
38 raw_desc->m0 = cpu_to_le64(SET_BITS(E, 1) |
39 SET_BITS(PKT_SIZE, SLOT_EMPTY));
40 dma_h = upper_32_bits(next_dma);
41 raw_desc->m1 = cpu_to_le64(SET_BITS(NEXT_DESC_ADDRL, next_dma) |
42 SET_BITS(NEXT_DESC_ADDRH, dma_h));
43 }
44 }
45
xge_update_tx_desc_addr(struct xge_pdata * pdata)46 void xge_update_tx_desc_addr(struct xge_pdata *pdata)
47 {
48 struct xge_desc_ring *ring = pdata->tx_ring;
49 dma_addr_t dma_addr = ring->dma_addr;
50
51 xge_wr_csr(pdata, DMATXDESCL, dma_addr);
52 xge_wr_csr(pdata, DMATXDESCH, upper_32_bits(dma_addr));
53
54 ring->head = 0;
55 ring->tail = 0;
56 }
57
xge_update_rx_desc_addr(struct xge_pdata * pdata)58 void xge_update_rx_desc_addr(struct xge_pdata *pdata)
59 {
60 struct xge_desc_ring *ring = pdata->rx_ring;
61 dma_addr_t dma_addr = ring->dma_addr;
62
63 xge_wr_csr(pdata, DMARXDESCL, dma_addr);
64 xge_wr_csr(pdata, DMARXDESCH, upper_32_bits(dma_addr));
65
66 ring->head = 0;
67 ring->tail = 0;
68 }
69
xge_intr_enable(struct xge_pdata * pdata)70 void xge_intr_enable(struct xge_pdata *pdata)
71 {
72 u32 data;
73
74 data = RX_PKT_RCVD | TX_PKT_SENT;
75 xge_wr_csr(pdata, DMAINTRMASK, data);
76 }
77
xge_intr_disable(struct xge_pdata * pdata)78 void xge_intr_disable(struct xge_pdata *pdata)
79 {
80 xge_wr_csr(pdata, DMAINTRMASK, 0);
81 }
82
