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https://github.com/brain-hackers/u-boot-brain
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44482e8a2a
Coreboot can provide information about the serial device in use on a platform. Add a driver that uses this information to produce a working UART. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* UART support for U-Boot when launched from Coreboot
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*
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* Copyright 2019 Google LLC
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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/sysinfo.h>
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static int coreboot_ofdata_to_platdata(struct udevice *dev)
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{
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struct ns16550_platdata *plat = dev_get_platdata(dev);
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struct cb_serial *cb_info = lib_sysinfo.serial;
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plat->base = cb_info->baseaddr;
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plat->reg_shift = cb_info->regwidth == 4 ? 2 : 0;
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plat->reg_width = cb_info->regwidth;
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plat->clock = cb_info->input_hertz;
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plat->fcr = UART_FCR_DEFVAL;
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plat->flags = 0;
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if (cb_info->type == CB_SERIAL_TYPE_IO_MAPPED)
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plat->flags |= NS16550_FLAG_IO;
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return 0;
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}
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static const struct udevice_id coreboot_serial_ids[] = {
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{ .compatible = "coreboot-serial" },
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{ },
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};
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U_BOOT_DRIVER(coreboot_uart) = {
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.name = "coreboot_uart",
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.id = UCLASS_SERIAL,
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.of_match = coreboot_serial_ids,
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.priv_auto_alloc_size = sizeof(struct NS16550),
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.platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
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.ofdata_to_platdata = coreboot_ofdata_to_platdata,
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.probe = ns16550_serial_probe,
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.ops = &ns16550_serial_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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