src/soc/amd/common/block/pci/pcie_gpp.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #include <acpi/acpi_device.h>
   4 #include <acpi/acpigen.h>
   5 #include <acpi/acpigen_pci.h>
   6 #include <amdblocks/amd_pci_util.h>
   7 #include <assert.h>
   8 #include <device/device.h>
   9 #include <device/pci.h>
  10 #include <device/pciexp.h>
  11 #include <soc/pci_devs.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14
  15 static const char *pcie_gpp_acpi_name(const struct device *dev)
  16 {
  17         char *name;
  18
  19         if (dev->path.type != DEVICE_PATH_PCI)
  20                 return NULL;
  21
  22         name = malloc(ACPI_NAME_BUFFER_SIZE);
  23         snprintf(name, ACPI_NAME_BUFFER_SIZE, "GP%02X", dev->path.pci.devfn);
  24         name[4] = '\0';
  25
  26         return name;
  27 }
  28
  29 static void acpi_device_write_gpp_pci_dev(const struct device *dev)
  30 {
  31         const char *scope = acpi_device_scope(dev);
  32         const char *name = acpi_device_name(dev);
  33
  34         assert(dev->path.type == DEVICE_PATH_PCI);
  35         assert(name);
  36         assert(scope);
  37
  38         acpigen_write_scope(scope);
  39         acpigen_write_device(name);
  40
  41         acpigen_write_ADR_pci_device(dev);
  42         acpigen_write_STA(acpi_device_status(dev));
  43
  44         acpigen_write_pci_GNB_PRT(dev);
  45
  46         acpigen_pop_len(); /* Device */
  47         acpigen_pop_len(); /* Scope */
  48 }
  49
  50 /* Latency tolerance reporting, max snoop/non-snoop latency value 1.049ms */
  51 #define PCIE_LTR_MAX_LATENCY_1049US 0x1001
  52
  53 static void pcie_get_ltr_max_latencies(u16 *max_snoop, u16 *max_nosnoop)
  54 {
  55         *max_snoop = PCIE_LTR_MAX_LATENCY_1049US;
  56         *max_nosnoop = PCIE_LTR_MAX_LATENCY_1049US;
  57 }
  58
  59 static struct pci_operations pcie_ops = {
  60         .get_ltr_max_latencies  = pcie_get_ltr_max_latencies,
  61         .set_subsystem          = pci_dev_set_subsystem,
  62 };
  63
  64 struct device_operations amd_internal_pcie_gpp_ops = {
  65         .read_resources         = pci_bus_read_resources,
  66         .set_resources          = pci_dev_set_resources,
  67         .enable_resources       = pci_bus_enable_resources,
  68         .scan_bus               = pci_scan_bridge,
  69         .reset_bus              = pci_bus_reset,
  70         .acpi_name              = pcie_gpp_acpi_name,
  71         .acpi_fill_ssdt         = acpi_device_write_gpp_pci_dev,
  72 };
  73
  74 struct device_operations amd_external_pcie_gpp_ops = {
  75         .read_resources         = pci_bus_read_resources,
  76         .set_resources          = pci_dev_set_resources,
  77         .enable_resources       = pci_bus_enable_resources,
  78         .scan_bus               = pciexp_scan_bridge,
  79         .reset_bus              = pci_bus_reset,
  80         .acpi_name              = pcie_gpp_acpi_name,
  81         .acpi_fill_ssdt         = acpi_device_write_gpp_pci_dev,
  82         .ops_pci                = &pcie_ops,
  83 };