arch/x86/cpu/slimbootloader/serial.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2019 Intel Corporation <www.intel.com>
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <ns16550.h>
   9 #include <serial.h>
  10 #include <asm/arch/slimbootloader.h>
  11
  12 /**
  13  * The serial port info hob is generated by Slim Bootloader, so eligible for
  14  * Slim Bootloader based boards only.
  15  */
  16 static int slimbootloader_serial_ofdata_to_platdata(struct udevice *dev)
  17 {
  18         const efi_guid_t guid = SBL_SERIAL_PORT_INFO_GUID;
  19         struct sbl_serial_port_info *data;
  20         struct ns16550_platdata *plat = dev->platdata;
  21
  22         if (!gd->arch.hob_list)
  23                 panic("hob list not found!");
  24
  25         data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid);
  26         if (!data) {
  27                 debug("failed to get serial port information\n");
  28                 return -ENOENT;
  29         }
  30         debug("type:%d base=0x%08x baudrate=%d stride=%d clk=%d\n",
  31               data->type,
  32               data->base,
  33               data->baud,
  34               data->stride,
  35               data->clk);
  36
  37         /*
  38          * The data->type provides port io or mmio access type info,
  39          * but the access type will be controlled by
  40          * CONFIG_SYS_NS16550_PORT_MAPPED or CONFIG_SYS_NS16550_MEM32.
  41          *
  42          * TBD: ns16550 access type configuration in runtime.
  43          *      ex) plat->access_type = data->type
  44          */
  45         plat->base = data->base;
  46         /* ns16550 uses reg_shift, then covert stride to shift */
  47         plat->reg_shift = data->stride >> 1;
  48         plat->clock = data->clk;
  49
  50         return 0;
  51 }
  52
  53 static const struct udevice_id slimbootloader_serial_ids[] = {
  54         { .compatible = "intel,slimbootloader-uart" },
  55         {}
  56 };
  57
  58 U_BOOT_DRIVER(serial_slimbootloader) = {
  59         .name   = "serial_slimbootloader",
  60         .id     = UCLASS_SERIAL,
  61         .of_match = slimbootloader_serial_ids,
  62         .ofdata_to_platdata = slimbootloader_serial_ofdata_to_platdata,
  63         .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
  64         .priv_auto_alloc_size = sizeof(struct NS16550),
  65         .probe  = ns16550_serial_probe,
  66         .ops    = &ns16550_serial_ops,
  67 };