[Nyx] Introducing hekate GUI, named Nyx!

Version 0.8.0.

Expect dragons!

nyx/nyx_gui/soc/uart.c

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+/*
+* Copyright (c) 2018 naehrwert
+*
+* This program is free software; you can redistribute it and/or modify it
+* under the terms and conditions of the GNU General Public License,
+* version 2, as published by the Free Software Foundation.
+*
+* This program is distributed in the hope it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+* more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "../soc/uart.h"
+#include "../soc/t210.h"
+#include "../utils/util.h"
+
+/* UART A, B, C, D and E. */
+static const u32 uart_baseoff[5] = { 0, 0x40, 0x200, 0x300, 0x400 };
+
+void uart_init(u32 idx, u32 baud)
+{
+	uart_t *uart = (uart_t *)(UART_BASE + uart_baseoff[idx]);
+
+	// Make sure no data is being sent.
+	uart_wait_idle(idx, UART_TX_IDLE);
+
+	// Misc settings.
+	u32 rate = (8 * baud + 408000000) / (16 * baud);
+	uart->UART_IER_DLAB = 0; // Disable interrupts.
+	uart->UART_MCR = 0; // Disable hardware flow control.
+	uart->UART_LCR = UART_LCR_DLAB | UART_LCR_WORD_LENGTH_8; // Enable DLAB & set 8n1 mode.
+	uart->UART_THR_DLAB = (u8)rate; // Divisor latch LSB.
+	uart->UART_IER_DLAB = (u8)(rate >> 8); // Divisor latch MSB.
+	uart->UART_LCR = UART_LCR_WORD_LENGTH_8; // Diable DLAB.
+
+	// Setup and flush fifo.
+	uart->UART_IIR_FCR = UART_IIR_FCR_EN_FIFO | UART_IIR_FCR_RX_CLR | UART_IIR_FCR_TX_CLR;
+	usleep(3 * ((baud + 999999) / baud));
+	uart_wait_idle(idx, UART_TX_IDLE | UART_RX_IDLE);
+}
+
+void uart_wait_idle(u32 idx, u32 which)
+{
+	uart_t *uart = (uart_t *)(UART_BASE + uart_baseoff[idx]);
+	if (UART_TX_IDLE & which)
+	{
+		while (!(uart->UART_LSR & UART_LSR_TMTY))
+			;
+	}
+	if (UART_RX_IDLE & which)
+	{
+		while (uart->UART_LSR & UART_LSR_RDR)
+			;
+	}
+}
+
+void uart_send(u32 idx, u8 *buf, u32 len)
+{
+	uart_t *uart = (uart_t *)(UART_BASE + uart_baseoff[idx]);
+
+	for (u32 i = 0; i != len; i++)
+	{
+		while (!(uart->UART_LSR & UART_LSR_THRE))
+			;
+		uart->UART_THR_DLAB = buf[i];
+	};
+}
+
+void uart_recv(u32 idx, u8 *buf, u32 len)
+{
+	uart_t *uart = (uart_t *)(UART_BASE + uart_baseoff[idx]);
+
+	for (u32 i = 0; i != len; i++)
+	{
+		while (!(uart->UART_LSR & UART_LSR_RDR))
+			;
+		buf[i] = uart->UART_THR_DLAB;
+	};
+}