mirror of
https://github.com/u-boot/u-boot.git
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157 lines
3.1 KiB
C
157 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <debug_uart.h>
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#include <dm.h>
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#include <efi.h>
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#include <efi_api.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <log.h>
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#include <linux/compiler.h>
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#include <asm/io.h>
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#include <serial.h>
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/* Information about the efi console */
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struct serial_efi_priv {
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struct efi_simple_text_input_protocol *con_in;
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struct efi_simple_text_output_protocol *con_out;
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struct efi_input_key key;
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bool have_key;
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};
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int serial_efi_setbrg(struct udevice *dev, int baudrate)
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{
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return 0;
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}
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static int serial_efi_get_key(struct serial_efi_priv *priv)
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{
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int ret;
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if (priv->have_key)
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return 0;
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ret = priv->con_in->read_key_stroke(priv->con_in, &priv->key);
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if (ret == EFI_NOT_READY)
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return -EAGAIN;
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else if (ret != EFI_SUCCESS)
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return -EIO;
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priv->have_key = true;
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return 0;
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}
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static int serial_efi_getc(struct udevice *dev)
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{
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struct serial_efi_priv *priv = dev_get_priv(dev);
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int ret, ch;
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ret = serial_efi_get_key(priv);
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if (ret)
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return ret;
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priv->have_key = false;
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ch = priv->key.unicode_char;
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/*
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* Unicode char 8 (for backspace) is never returned. Instead we get a
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* key scan code of 8. Handle this so that backspace works correctly
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* in the U-Boot command line.
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*/
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if (!ch && priv->key.scan_code == 8)
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ch = 8;
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debug(" [%x %x %x] ", ch, priv->key.unicode_char, priv->key.scan_code);
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return ch;
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}
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static int serial_efi_putc(struct udevice *dev, const char ch)
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{
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struct serial_efi_priv *priv = dev_get_priv(dev);
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uint16_t ucode[2];
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int ret;
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ucode[0] = ch;
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ucode[1] = '\0';
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ret = priv->con_out->output_string(priv->con_out, ucode);
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if (ret)
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return -EIO;
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return 0;
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}
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static int serial_efi_pending(struct udevice *dev, bool input)
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{
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struct serial_efi_priv *priv = dev_get_priv(dev);
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int ret;
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/* We assume that EFI will stall if its output buffer fills up */
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if (!input)
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return 0;
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ret = serial_efi_get_key(priv);
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if (ret == -EAGAIN)
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return 0;
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else if (ret)
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return ret;
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return 1;
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}
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/*
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* There is nothing to init here since the EFI console is already running by
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* the time we enter U-Boot.
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*/
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static inline void _debug_uart_init(void)
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{
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}
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static inline void _debug_uart_putc(int ch)
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{
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struct efi_system_table *sys_table = efi_get_sys_table();
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uint16_t ucode[2];
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ucode[0] = ch;
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ucode[1] = '\0';
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sys_table->con_out->output_string(sys_table->con_out, ucode);
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}
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DEBUG_UART_FUNCS
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static int serial_efi_probe(struct udevice *dev)
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{
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struct efi_system_table *table = efi_get_sys_table();
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struct serial_efi_priv *priv = dev_get_priv(dev);
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priv->con_in = table->con_in;
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priv->con_out = table->con_out;
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return 0;
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}
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static const struct dm_serial_ops serial_efi_ops = {
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.putc = serial_efi_putc,
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.getc = serial_efi_getc,
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.pending = serial_efi_pending,
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.setbrg = serial_efi_setbrg,
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};
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static const struct udevice_id serial_efi_ids[] = {
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{ .compatible = "efi,uart" },
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{ }
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};
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U_BOOT_DRIVER(serial_efi) = {
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.name = "serial_efi",
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.id = UCLASS_SERIAL,
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.of_match = serial_efi_ids,
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.priv_auto_alloc_size = sizeof(struct serial_efi_priv),
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.probe = serial_efi_probe,
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.ops = &serial_efi_ops,
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};
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