src/mainboard/siemens/mc_apl1/bootblock.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <baseboard/variants.h>
   4 #include <bootblock_common.h>
   5 #include <device/pci_def.h>
   6 #include <device/pci_ops.h>
   7 #include <intelblocks/gpio.h>
   8 #include <types.h>
   9
  10 static void pcie_rp_early_enable(void)
  11 {
  12         const pci_devfn_t rp_dev = PCI_DEV(0, CONFIG_EARLY_PCI_BRIDGE_DEVICE,
  13                 CONFIG_EARLY_PCI_BRIDGE_FUNCTION);
  14
  15         if (pci_read_config16(rp_dev, PCI_VENDOR_ID) == 0xffff)
  16                 return;
  17
  18         /*
  19          * Needs to be done "immediately after PERST# de-assertion"
  20          * as per IAFW BIOS spec volume 2 (doc 559811)
  21          */
  22         pci_and_config32(rp_dev, 0x338, ~(1 << 26));    /* BLKDQDA */
  23         pci_and_config32(rp_dev,  0xf4, ~(1 <<  2));    /* BLKPLLEN */
  24 }
  25
  26 void bootblock_mainboard_early_init(void)
  27 {
  28         const struct pad_config *pads;
  29         size_t num;
  30
  31         pads = variant_early_gpio_table(&num);
  32         gpio_configure_pads(pads, num);
  33
  34         /* Enable the PCIe root port when used before FSP-M MemoryInit() */
  35         if (CONFIG(EARLY_PCI_BRIDGE))
  36                 pcie_rp_early_enable();
  37 }