diff options
Diffstat (limited to 'roms/u-boot/arch/x86/cpu/slimbootloader/serial.c')
-rw-r--r-- | roms/u-boot/arch/x86/cpu/slimbootloader/serial.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/roms/u-boot/arch/x86/cpu/slimbootloader/serial.c b/roms/u-boot/arch/x86/cpu/slimbootloader/serial.c new file mode 100644 index 000000000..d28b28089 --- /dev/null +++ b/roms/u-boot/arch/x86/cpu/slimbootloader/serial.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Intel Corporation <www.intel.com> + */ + +#include <common.h> +#include <dm.h> +#include <log.h> +#include <ns16550.h> +#include <serial.h> +#include <asm/arch/slimbootloader.h> +#include <asm/global_data.h> + +/** + * The serial port info hob is generated by Slim Bootloader, so eligible for + * Slim Bootloader based boards only. + */ +static int slimbootloader_serial_of_to_plat(struct udevice *dev) +{ + const efi_guid_t guid = SBL_SERIAL_PORT_INFO_GUID; + struct sbl_serial_port_info *data; + struct ns16550_plat *plat = dev_get_plat(dev); + + if (!gd->arch.hob_list) + panic("hob list not found!"); + + data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid); + if (!data) { + debug("failed to get serial port information\n"); + return -ENOENT; + } + debug("type:%d base=0x%08x baudrate=%d stride=%d clk=%d\n", + data->type, + data->base, + data->baud, + data->stride, + data->clk); + + plat->base = data->base; + /* ns16550 uses reg_shift, then covert stride to shift */ + plat->reg_shift = data->stride >> 1; + plat->reg_width = data->stride; + plat->clock = data->clk; + plat->fcr = UART_FCR_DEFVAL; + plat->flags = 0; + if (data->type == 1) + plat->flags |= NS16550_FLAG_IO; + + return 0; +} + +static const struct udevice_id slimbootloader_serial_ids[] = { + { .compatible = "intel,slimbootloader-uart" }, + {} +}; + +U_BOOT_DRIVER(serial_slimbootloader) = { + .name = "serial_slimbootloader", + .id = UCLASS_SERIAL, + .of_match = slimbootloader_serial_ids, + .of_to_plat = slimbootloader_serial_of_to_plat, + .plat_auto = sizeof(struct ns16550_plat), + .priv_auto = sizeof(struct ns16550), + .probe = ns16550_serial_probe, + .ops = &ns16550_serial_ops, +}; |