drivers/net/ethernet/apm/xgene-v2/enet.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 void xge_wr_csr(struct xge_pdata *pdata, u32 offset, u32 val)
  25 {
  26         void __iomem *addr = pdata->resources.base_addr + offset;
  27
  28         iowrite32(val, addr);
  29 }
  30
  31 u32 xge_rd_csr(struct xge_pdata *pdata, u32 offset)
  32 {
  33         void __iomem *addr = pdata->resources.base_addr + offset;
  34
  35         return ioread32(addr);
  36 }
  37
  38 int xge_port_reset(struct net_device *ndev)
  39 {
  40         struct xge_pdata *pdata = netdev_priv(ndev);
  41         struct device *dev = &pdata->pdev->dev;
  42         u32 data, wait = 10;
  43
  44         xge_wr_csr(pdata, ENET_CLKEN, 0x3);
  45         xge_wr_csr(pdata, ENET_SRST, 0xf);
  46         xge_wr_csr(pdata, ENET_SRST, 0);
  47         xge_wr_csr(pdata, CFG_MEM_RAM_SHUTDOWN, 1);
  48         xge_wr_csr(pdata, CFG_MEM_RAM_SHUTDOWN, 0);
  49
  50         do {
  51                 usleep_range(100, 110);
  52                 data = xge_rd_csr(pdata, BLOCK_MEM_RDY);
  53         } while (data != MEM_RDY && wait--);
  54
  55         if (data != MEM_RDY) {
  56                 dev_err(dev, "ECC init failed: %x\n", data);
  57                 return -ETIMEDOUT;
  58         }
  59
  60         xge_wr_csr(pdata, ENET_SHIM, DEVM_ARAUX_COH | DEVM_AWAUX_COH);
  61
  62         return 0;
  63 }
  64
  65 static void xge_traffic_resume(struct net_device *ndev)
  66 {
  67         struct xge_pdata *pdata = netdev_priv(ndev);
  68
  69         xge_wr_csr(pdata, CFG_FORCE_LINK_STATUS_EN, 1);
  70         xge_wr_csr(pdata, FORCE_LINK_STATUS, 1);
  71
  72         xge_wr_csr(pdata, CFG_LINK_AGGR_RESUME, 1);
  73         xge_wr_csr(pdata, RX_DV_GATE_REG, 1);
  74 }
  75
  76 void xge_port_init(struct net_device *ndev)
  77 {
  78         struct xge_pdata *pdata = netdev_priv(ndev);
  79
  80         pdata->phy_speed = SPEED_1000;
  81         xge_mac_init(pdata);
  82         xge_traffic_resume(ndev);
  83 }