diff options
Diffstat (limited to 'drivers/serial/serial_coreboot.c')
| -rw-r--r-- | drivers/serial/serial_coreboot.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/serial/serial_coreboot.c b/drivers/serial/serial_coreboot.c new file mode 100644 index 0000000000..ccab347514 --- /dev/null +++ b/drivers/serial/serial_coreboot.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * UART support for U-Boot when launched from Coreboot + * + * Copyright 2019 Google LLC + */ + +#include <common.h> +#include <dm.h> +#include <ns16550.h> +#include <serial.h> +#include <asm/arch/sysinfo.h> + +static int coreboot_ofdata_to_platdata(struct udevice *dev) +{ + struct ns16550_platdata *plat = dev_get_platdata(dev); + struct cb_serial *cb_info = lib_sysinfo.serial; + + plat->base = cb_info->baseaddr; + plat->reg_shift = cb_info->regwidth == 4 ? 2 : 0; + plat->reg_width = cb_info->regwidth; + plat->clock = cb_info->input_hertz; + plat->fcr = UART_FCR_DEFVAL; + plat->flags = 0; + if (cb_info->type == CB_SERIAL_TYPE_IO_MAPPED) + plat->flags |= NS16550_FLAG_IO; + + return 0; +} + +static const struct udevice_id coreboot_serial_ids[] = { + { .compatible = "coreboot-serial" }, + { }, +}; + +U_BOOT_DRIVER(coreboot_uart) = { + .name = "coreboot_uart", + .id = UCLASS_SERIAL, + .of_match = coreboot_serial_ids, + .priv_auto_alloc_size = sizeof(struct NS16550), + .platdata_auto_alloc_size = sizeof(struct ns16550_platdata), + .ofdata_to_platdata = coreboot_ofdata_to_platdata, + .probe = ns16550_serial_probe, + .ops = &ns16550_serial_ops, + .flags = DM_FLAG_PRE_RELOC, +}; |