LXR linux/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 */
  13void 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
  34void 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
  46void 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
  58void 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
  66void xge_intr_disable(struct xge_pdata *pdata)
  67{
  68        xge_wr_csr(pdata, DMAINTRMASK, 0);
  69}
  70