71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <rtl.h>
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#include <pci.h>
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#include <uart16550.h>
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#define MAX_PORT 0x10000 /* port 0 - 64K */
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#define DEFAULT_UART_PORT 0x3F8
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#define MAX_CMD_LEN 64
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static const char * const cmd_list[] = {
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"uart=disabled", /* to disable uart */
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"uart=port@", /* like uart=port@0x3F8 */
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"uart=bdf@", /*like: uart=bdf@0:18.2, it is for ttyS2 */
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};
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enum IDX_CMD_DBG {
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IDX_DISABLE_UART,
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IDX_PORT_UART,
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IDX_PCI_UART,
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IDX_MAX_CMD,
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};
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bool handle_dbg_cmd(const char *cmd, int32_t len)
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{
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int32_t i;
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bool handled = false;
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for (i = 0; i < IDX_MAX_CMD; i++) {
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int32_t tmp = strnlen_s(cmd_list[i], MAX_CMD_LEN);
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/*cmd prefix should be same with one in cmd_list */
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if (len < tmp)
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continue;
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if (strncmp(cmd_list[i], cmd, tmp) != 0)
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continue;
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if (i == IDX_DISABLE_UART) {
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/* set uart disabled*/
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uart16550_set_property(false, false, 0UL);
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} else if (i == IDX_PORT_UART) {
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uint64_t addr = strtoul_hex(cmd + tmp);
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if (addr > MAX_PORT) {
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addr = DEFAULT_UART_PORT;
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}
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uart16550_set_property(true, true, addr);
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} else if (i == IDX_PCI_UART) {
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uart16550_set_property(true, false, (uint64_t)(cmd+tmp));
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} else {
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/* No other state currently, do nothing */
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}
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}
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if (i < IDX_MAX_CMD) {
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handled = true;
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}
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return handled;
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}
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