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eb2daa0f4e
Add xtensa semihosting driver. It can't use regular semihosting driver as Xtensa's has it's own semihosting ABI. Tested-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
92 lines
1.6 KiB
C
92 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2024 Jiaxun Yang <jiaxun.yang@flygoat.com>
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*/
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#include <dm.h>
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#include <malloc.h>
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#include <serial.h>
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#include <asm/platform/simcall.h>
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/**
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* struct simc_serial_priv - Semihosting serial private data
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* @counter: Counter used to fake pending every other call
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*/
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struct simc_serial_priv {
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unsigned int counter;
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};
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static int simc_serial_getc(struct udevice *dev)
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{
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char ch = 0;
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simc_read(0, &ch, sizeof(ch));
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return ch;
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}
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static int simc_serial_putc(struct udevice *dev, const char ch)
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{
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char str[2] = {0};
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str[0] = ch;
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simc_write(1, str, 1);
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return 0;
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}
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static int simc_serial_pending(struct udevice *dev, bool input)
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{
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struct simc_serial_priv *priv = dev_get_priv(dev);
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if (input) {
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int res = simc_poll(0);
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return res < 0 ? priv->counter++ & 1 : res;
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}
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return false;
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}
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static ssize_t smh_serial_puts(struct udevice *dev, const char *s, size_t len)
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{
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int ret;
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ret = simc_write(1, s, len);
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return ret;
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}
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static const struct dm_serial_ops simc_serial_ops = {
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.putc = simc_serial_putc,
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.puts = smh_serial_puts,
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.getc = simc_serial_getc,
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.pending = simc_serial_pending,
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};
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U_BOOT_DRIVER(simc_serial) = {
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.name = "serial_xtensa_semihosting",
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.id = UCLASS_SERIAL,
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.priv_auto = sizeof(struct simc_serial_priv),
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.ops = &simc_serial_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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U_BOOT_DRVINFO(simc_serial) = {
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.name = "serial_xtensa_semihosting",
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};
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#if CONFIG_IS_ENABLED(DEBUG_UART_XTENSA_SEMIHOSTING)
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#include <debug_uart.h>
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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 c)
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{
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simc_serial_putc(NULL, c);
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}
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DEBUG_UART_FUNCS
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#endif
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