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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Applied Micro X-Gene SoC Ethernet v2 Driver
   4  *
   5  * Copyright (c) 2017, Applied Micro Circuits Corporation
   6  * Author(s): Iyappan Subramanian <isubramanian@apm.com>
   7  *            Keyur Chudgar <kchudgar@apm.com>
   8  */
   9
  10 #include "main.h"
  11
  12 /* create circular linked list of descriptors */
  13 void xge_setup_desc(struct xge_desc_ring *ring)
  14 {
  15         struct xge_raw_desc *raw_desc;
  16         dma_addr_t dma_h, next_dma;
  17         u16 offset;
  18         int i;
  19
  20         for (i = 0; i < XGENE_ENET_NUM_DESC; i++) {
  21                 raw_desc = &ring->raw_desc[i];
  22
  23                 offset = (i + 1) & (XGENE_ENET_NUM_DESC - 1);
  24                 next_dma = ring->dma_addr + (offset * XGENE_ENET_DESC_SIZE);
  25
  26                 raw_desc->m0 = cpu_to_le64(SET_BITS(E, 1) |
  27                                            SET_BITS(PKT_SIZE, SLOT_EMPTY));
  28                 dma_h = upper_32_bits(next_dma);
  29                 raw_desc->m1 = cpu_to_le64(SET_BITS(NEXT_DESC_ADDRL, next_dma) |
  30                                            SET_BITS(NEXT_DESC_ADDRH, dma_h));
  31         }
  32 }
  33
  34 void xge_update_tx_desc_addr(struct xge_pdata *pdata)
  35 {
  36         struct xge_desc_ring *ring = pdata->tx_ring;
  37         dma_addr_t dma_addr = ring->dma_addr;
  38
  39         xge_wr_csr(pdata, DMATXDESCL, dma_addr);
  40         xge_wr_csr(pdata, DMATXDESCH, upper_32_bits(dma_addr));
  41
  42         ring->head = 0;
  43         ring->tail = 0;
  44 }
  45
  46 void xge_update_rx_desc_addr(struct xge_pdata *pdata)
  47 {
  48         struct xge_desc_ring *ring = pdata->rx_ring;
  49         dma_addr_t dma_addr = ring->dma_addr;
  50
  51         xge_wr_csr(pdata, DMARXDESCL, dma_addr);
  52         xge_wr_csr(pdata, DMARXDESCH, upper_32_bits(dma_addr));
  53
  54         ring->head = 0;
  55         ring->tail = 0;
  56 }
  57
  58 void xge_intr_enable(struct xge_pdata *pdata)
  59 {
  60         u32 data;
  61
  62         data = RX_PKT_RCVD | TX_PKT_SENT;
  63         xge_wr_csr(pdata, DMAINTRMASK, data);
  64 }
  65
  66 void xge_intr_disable(struct xge_pdata *pdata)
  67 {
  68         xge_wr_csr(pdata, DMAINTRMASK, 0);
  69 }