mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
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 = 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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