LXR uboot/drivers/serial/serial

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * UART support for U-Boot when launched from Coreboot
   4 *
   5 * Copyright 2019 Google LLC
   6 */
   7
   8#include <common.h>
   9#include <dm.h>
  10#include <ns16550.h>
  11#include <serial.h>
  12#include <asm/cb_sysinfo.h>
  13
  14static int coreboot_of_to_plat(struct udevice *dev)
  15{
  16        struct ns16550_plat *plat = dev_get_plat(dev);
  17        struct cb_serial *cb_info = lib_sysinfo.serial;
  18
  19        plat->base = cb_info->baseaddr;
  20        plat->reg_shift = cb_info->regwidth == 4 ? 2 : 0;
  21        plat->reg_width = cb_info->regwidth;
  22        plat->clock = cb_info->input_hertz;
  23        plat->fcr = UART_FCR_DEFVAL;
  24        plat->flags = 0;
  25        if (cb_info->type == CB_SERIAL_TYPE_IO_MAPPED)
  26                plat->flags |= NS16550_FLAG_IO;
  27
  28        return 0;
  29}
  30
  31static const struct udevice_id coreboot_serial_ids[] = {
  32        { .compatible = "coreboot-serial" },
  33        { },
  34};
  35
  36U_BOOT_DRIVER(coreboot_uart) = {
  37        .name   = "coreboot_uart",
  38        .id     = UCLASS_SERIAL,
  39        .of_match       = coreboot_serial_ids,
  40        .priv_auto      = sizeof(struct ns16550),
  41        .plat_auto      = sizeof(struct ns16550_plat),
  42        .of_to_plat  = coreboot_of_to_plat,
  43        .probe  = ns16550_serial_probe,
  44        .ops    = &ns16550_serial_ops,
  45        .flags  = DM_FLAG_PRE_RELOC,
  46};
  47