From 2869c3b3de390ed7dba3d854160d9b19dd4660a3 Mon Sep 17 00:00:00 2001 From: "Park, Aiden" Date: Sat, 3 Aug 2019 08:30:44 +0000 Subject: x86: slimbootloader: Add serial driver 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 Reviewed-by: Bin Meng Reviewed-by: Andy Shevchenko Tested-by: Bin Meng --- arch/x86/cpu/slimbootloader/serial.c | 67 ++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 arch/x86/cpu/slimbootloader/serial.c (limited to 'arch/x86/cpu/slimbootloader/serial.c') diff --git a/arch/x86/cpu/slimbootloader/serial.c b/arch/x86/cpu/slimbootloader/serial.c new file mode 100644 index 0000000000..7b44a59bff --- /dev/null +++ b/arch/x86/cpu/slimbootloader/serial.c @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Intel Corporation + */ + +#include +#include +#include +#include +#include + +/** + * The serial port info hob is generated by Slim Bootloader, so eligible for + * Slim Bootloader based boards only. + */ +static int slimbootloader_serial_ofdata_to_platdata(struct udevice *dev) +{ + const efi_guid_t guid = SBL_SERIAL_PORT_INFO_GUID; + struct sbl_serial_port_info *data; + struct ns16550_platdata *plat = dev->platdata; + + 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); + + /* + * The data->type provides port io or mmio access type info, + * but the access type will be controlled by + * CONFIG_SYS_NS16550_PORT_MAPPED or CONFIG_SYS_NS16550_MEM32. + * + * TBD: ns16550 access type configuration in runtime. + * ex) plat->access_type = data->type + */ + plat->base = data->base; + /* ns16550 uses reg_shift, then covert stride to shift */ + plat->reg_shift = data->stride >> 1; + plat->clock = data->clk; + + 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, + .ofdata_to_platdata = slimbootloader_serial_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct ns16550_platdata), + .priv_auto_alloc_size = sizeof(struct NS16550), + .probe = ns16550_serial_probe, + .ops = &ns16550_serial_ops, +}; -- cgit v1.2.3