mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-12 22:33:18 +00:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
156 lines
3.1 KiB
C
156 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 <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_input_interface *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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.flags = DM_FLAG_PRE_RELOC,
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};
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