drivers/common/sfc_efx/base/rhead_pci.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright(c) 2019-2020 Xilinx, Inc.
   4  * Copyright(c) 2019 Solarflare Communications Inc.
   5  */
   6
   7 #include "efx.h"
   8 #include "efx_impl.h"
   9
  10 #if EFSYS_OPT_RIVERHEAD && EFSYS_OPT_PCI
  11
  12         __checkReturn                   efx_rc_t
  13 rhead_pci_nic_membar_lookup(
  14         __in                            efsys_pci_config_t *espcp,
  15         __out                           efx_bar_region_t *ebrp)
  16 {
  17         boolean_t xilinx_tbl_found = B_FALSE;
  18         unsigned int xilinx_tbl_bar;
  19         efsys_dma_addr_t xilinx_tbl_offset;
  20         size_t pci_capa_offset = 0;
  21         boolean_t bar_found = B_FALSE;
  22         efx_rc_t rc = ENOENT;
  23         efsys_bar_t xil_eb;
  24
  25         /*
  26          * SF-119689-TC Riverhead Host Interface section 4.2.2. describes
  27          * the following discovery steps.
  28          */
  29         while (1) {
  30                 rc = efx_pci_find_next_xilinx_cap_table(espcp, &pci_capa_offset,
  31                                                         &xilinx_tbl_bar,
  32                                                         &xilinx_tbl_offset);
  33                 if (rc != 0) {
  34                         /*
  35                          * SF-119689-TC Riverhead Host Interface section 4.2.2.
  36                          * defines the following fallbacks for the memory bar
  37                          * and the offset when no Xilinx capabilities table is
  38                          * found.
  39                          */
  40                         if (rc == ENOENT && xilinx_tbl_found == B_FALSE) {
  41                                 ebrp->ebr_type = EFX_BAR_TYPE_MEM;
  42                                 ebrp->ebr_index = EFX_MEM_BAR_RIVERHEAD;
  43                                 ebrp->ebr_offset = 0;
  44                                 ebrp->ebr_length = 0;
  45                                 bar_found = B_TRUE;
  46                                 break;
  47                         } else {
  48                                 goto fail1;
  49                         }
  50
  51                 }
  52
  53                 xilinx_tbl_found = B_TRUE;
  54
  55                 EFSYS_PCI_FIND_MEM_BAR(espcp, xilinx_tbl_bar, &xil_eb, &rc);
  56                 if (rc != 0)
  57                         goto fail2;
  58         }
  59
  60         if (bar_found == B_FALSE)
  61                 goto fail3;
  62
  63         return (0);
  64
  65 fail3:
  66         EFSYS_PROBE(fail3);
  67 fail2:
  68         EFSYS_PROBE(fail2);
  69 fail1:
  70         EFSYS_PROBE1(fail1, efx_rc_t, rc);
  71
  72         return (rc);
  73 }
  74
  75 #endif /* EFSYS_OPT_RIVERHEAD && EFSYS_OPT_PCI */