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2869c3b3de
Slim Bootloader provides serial port info thru its HOB list pointer. All these HOBs are eligible for Slim Bootloader based board only. - Get serial port information from the serial port info HOB - Leverage ns16550 driver with slimbootloader specific platform data Signed-off-by: Aiden Park <aiden.park@intel.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 Intel Corporation <www.intel.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <ns16550.h>
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#include <serial.h>
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#include <asm/arch/slimbootloader.h>
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/**
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* The serial port info hob is generated by Slim Bootloader, so eligible for
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* Slim Bootloader based boards only.
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*/
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static int slimbootloader_serial_ofdata_to_platdata(struct udevice *dev)
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{
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const efi_guid_t guid = SBL_SERIAL_PORT_INFO_GUID;
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struct sbl_serial_port_info *data;
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struct ns16550_platdata *plat = dev->platdata;
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if (!gd->arch.hob_list)
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panic("hob list not found!");
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data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid);
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if (!data) {
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debug("failed to get serial port information\n");
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return -ENOENT;
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}
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debug("type:%d base=0x%08x baudrate=%d stride=%d clk=%d\n",
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data->type,
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data->base,
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data->baud,
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data->stride,
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data->clk);
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/*
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* The data->type provides port io or mmio access type info,
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* but the access type will be controlled by
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* CONFIG_SYS_NS16550_PORT_MAPPED or CONFIG_SYS_NS16550_MEM32.
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*
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* TBD: ns16550 access type configuration in runtime.
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* ex) plat->access_type = data->type
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*/
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plat->base = data->base;
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/* ns16550 uses reg_shift, then covert stride to shift */
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plat->reg_shift = data->stride >> 1;
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plat->clock = data->clk;
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return 0;
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}
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static const struct udevice_id slimbootloader_serial_ids[] = {
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{ .compatible = "intel,slimbootloader-uart" },
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{}
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};
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U_BOOT_DRIVER(serial_slimbootloader) = {
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.name = "serial_slimbootloader",
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.id = UCLASS_SERIAL,
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.of_match = slimbootloader_serial_ids,
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.ofdata_to_platdata = slimbootloader_serial_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
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.priv_auto_alloc_size = sizeof(struct NS16550),
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.probe = ns16550_serial_probe,
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.ops = &ns16550_serial_ops,
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};
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