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 <log.h>
   9 #include <ns16550.h>
  10 #include <serial.h>
  11 #include <asm/arch/slimbootloader.h>
  12
  13 /**
  14  * The serial port info hob is generated by Slim Bootloader, so eligible for
  15  * Slim Bootloader based boards only.
  16  */
  17 static int slimbootloader_serial_ofdata_to_platdata(struct udevice *dev)
  18 {
  19         const efi_guid_t guid = SBL_SERIAL_PORT_INFO_GUID;
  20         struct sbl_serial_port_info *data;
  21         struct ns16550_platdata *plat = dev->platdata;
  22
  23         if (!gd->arch.hob_list)
  24                 panic("hob list not found!");
  25
  26         data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid);
  27         if (!data) {
  28                 debug("failed to get serial port information\n");
  29                 return -ENOENT;
  30         }
  31         debug("type:%d base=0x%08x baudrate=%d stride=%d clk=%d\n",
  32               data->type,
  33               data->base,
  34               data->baud,
  35               data->stride,
  36               data->clk);
  37
  38         plat->base = data->base;
  39         /* ns16550 uses reg_shift, then covert stride to shift */
  40         plat->reg_shift = data->stride >> 1;
  41         plat->reg_width = data->stride;
  42         plat->clock = data->clk;
  43         plat->fcr = UART_FCR_DEFVAL;
  44         plat->flags = 0;
  45         if (data->type == 1)
  46                 plat->flags |= NS16550_FLAG_IO;
  47
  48         return 0;
  49 }
  50
  51 static const struct udevice_id slimbootloader_serial_ids[] = {
  52         { .compatible = "intel,slimbootloader-uart" },
  53         {}
  54 };
  55
  56 U_BOOT_DRIVER(serial_slimbootloader) = {
  57         .name   = "serial_slimbootloader",
  58         .id     = UCLASS_SERIAL,
  59         .of_match = slimbootloader_serial_ids,
  60         .ofdata_to_platdata = slimbootloader_serial_ofdata_to_platdata,
  61         .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
  62         .priv_auto_alloc_size = sizeof(struct NS16550),
  63         .probe  = ns16550_serial_probe,
  64         .ops    = &ns16550_serial_ops,
  65 };