drivers/net/ethernet/apm/xgene-v2/ring.c

   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 */
  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
  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
  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
  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
  78 void xge_intr_disable(struct xge_pdata *pdata)
  79 {
  80         xge_wr_csr(pdata, DMAINTRMASK, 0);
  81 }