avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/arch/sparc/cpu/leon2/serial.c

@@ -0,0 +1,147 @@
+/* GRLIB APBUART Serial controller driver
+ *
+ * (C) Copyright 2008, 2015
+ * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <serial.h>
+#include <watchdog.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static unsigned leon2_serial_calc_scaler(unsigned freq, unsigned baud)
+{
+	return (((freq*10) / (baud*8)) - 5) / 10;
+}
+
+static int leon2_serial_init(void)
+{
+	LEON2_regs *leon2 = (LEON2_regs *)LEON2_PREGS;
+	LEON2_Uart_regs *regs;
+	unsigned int tmp;
+
+#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1
+	regs = (LEON2_Uart_regs *)&leon2->UART_Channel_1;
+#else
+	regs = (LEON2_Uart_regs *)&leon2->UART_Channel_2;
+#endif
+
+	/* Set scaler / baud rate */
+	tmp = leon2_serial_calc_scaler(CONFIG_SYS_CLK_FREQ, CONFIG_BAUDRATE);
+	writel(tmp, &regs->UART_Scaler);
+
+	/* Let bit 11 be unchanged (debug bit for GRMON) */
+	tmp = readl(&regs->UART_Control) & LEON2_UART_CTRL_DBG;
+	tmp |= (LEON2_UART1_LOOPBACK_ENABLE << 7);
+	tmp |= (LEON2_UART1_FLOWCTRL_ENABLE << 6);
+	tmp |= (LEON2_UART1_PARITY_ENABLE << 5);
+	tmp |= (LEON2_UART1_ODDPAR_ENABLE << 4);
+	/* Receiver & transmitter enable */
+	tmp |= (LEON2_UART_CTRL_RE | LEON2_UART_CTRL_TE);
+	writel(tmp, &regs->UART_Control);
+
+	gd->arch.uart = regs;
+	return 0;
+}
+
+static inline LEON2_Uart_regs *leon2_get_uart_regs(void)
+{
+	LEON2_Uart_regs *uart = gd->arch.uart;
+
+	return uart;
+}
+
+static void leon2_serial_putc_raw(const char c)
+{
+	LEON2_Uart_regs *uart = leon2_get_uart_regs();
+
+	if (!uart)
+		return;
+
+	/* Wait for last character to go. */
+	while (!(readl(&uart->UART_Status) & LEON2_UART_STAT_THE))
+		WATCHDOG_RESET();
+
+	/* Send data */
+	writel(c, &uart->UART_Channel);
+
+#ifdef LEON_DEBUG
+	/* Wait for data to be sent */
+	while (!(readl(&uart->UART_Status) & LEON2_UART_STAT_TSE))
+		WATCHDOG_RESET();
+#endif
+}
+
+static void leon2_serial_putc(const char c)
+{
+	if (c == '\n')
+		leon2_serial_putc_raw('\r');
+
+	leon2_serial_putc_raw(c);
+}
+
+static int leon2_serial_getc(void)
+{
+	LEON2_Uart_regs *uart = leon2_get_uart_regs();
+
+	if (!uart)
+		return 0;
+
+	/* Wait for a character to arrive. */
+	while (!(readl(&uart->UART_Status) & LEON2_UART_STAT_DR))
+		WATCHDOG_RESET();
+
+	/* Read character data */
+	return readl(&uart->UART_Channel);
+}
+
+static int leon2_serial_tstc(void)
+{
+	LEON2_Uart_regs *uart = leon2_get_uart_regs();
+
+	if (!uart)
+		return 0;
+
+	return readl(&uart->UART_Status) & LEON2_UART_STAT_DR;
+}
+
+static void leon2_serial_setbrg(void)
+{
+	LEON2_Uart_regs *uart = leon2_get_uart_regs();
+	unsigned int scaler;
+
+	if (!uart)
+		return;
+
+	if (!gd->baudrate)
+		gd->baudrate = CONFIG_BAUDRATE;
+
+	scaler = leon2_serial_calc_scaler(CONFIG_SYS_CLK_FREQ, gd->baudrate);
+
+	writel(scaler, &uart->UART_Scaler);
+}
+
+static struct serial_device leon2_serial_drv = {
+	.name	= "leon2_serial",
+	.start	= leon2_serial_init,
+	.stop	= NULL,
+	.setbrg	= leon2_serial_setbrg,
+	.putc	= leon2_serial_putc,
+	.puts	= default_serial_puts,
+	.getc	= leon2_serial_getc,
+	.tstc	= leon2_serial_tstc,
+};
+
+void leon2_serial_initialize(void)
+{
+	serial_register(&leon2_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &leon2_serial_drv;
+}