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/board/renesas/ap325rxa/cpld-ap325rxa.c

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+/***************************************************************
+ * Project:
+ *	  CPLD SlaveSerial Configuration via embedded microprocessor.
+ *
+ * Copyright info:
+ *
+ *	  This is free software; you can redistribute it and/or modify
+ *	  it as you like.
+ *
+ *	  This program is distributed in the hope that it will be useful,
+ *	  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Description:
+ *
+ *      This is the main source file that will allow a microprocessor
+ *      to configure Xilinx Virtex, Virtex-E, Virtex-EM, Virtex-II,
+ *      and Spartan-II devices via the SlaveSerial Configuration Mode.
+ *      This code is discussed in Xilinx Application Note, XAPP502.
+ *
+ * History:
+ *	  3-October-2001  MN/MP  - Created
+ *	  20-August-2008  Renesas Solutions - Modified to SH7723
+ ****************************************************************/
+
+#include <common.h>
+
+/* Serial */
+#define SCIF_BASE 0xffe00000 /* SCIF0 */
+#define SCSMR	(vu_short *)(SCIF_BASE + 0x00)
+#define SCBRR	(vu_char *)(SCIF_BASE + 0x04)
+#define SCSCR	(vu_short *)(SCIF_BASE + 0x08)
+#define SC_TDR	(vu_char *)(SCIF_BASE + 0x0C)
+#define SC_SR	(vu_short *)(SCIF_BASE + 0x10)
+#define SCFCR	(vu_short *)(SCIF_BASE + 0x18)
+#define	RFCR	(vu_long *)0xFE400020
+
+#define SCSCR_INIT		0x0038
+#define SCSCR_CLR		0x0000
+#define SCFCR_INIT		0x0006
+#define SCSMR_INIT		0x0080
+#define RFCR_CLR		0xA400
+#define SCI_TD_E		0x0020
+#define SCI_TDRE_CLEAR	0x00df
+
+#define BPS_SETTING_VALUE	1 /* 12.5MHz */
+#define WAIT_RFCR_COUNTER	500
+
+/* CPLD data size */
+#define CPLD_DATA_SIZE	169216
+
+/* out */
+#define CPLD_PFC_ADR	((vu_short *)0xA4050112)
+
+#define CPLD_PROG_ADR	((vu_char *)0xA4050132)
+#define CPLD_PROG_DAT	0x80
+
+/* in */
+#define CPLD_INIT_ADR	((vu_char *)0xA4050132)
+#define CPLD_INIT_DAT	0x40
+#define CPLD_DONE_ADR	((vu_char *)0xA4050132)
+#define CPLD_DONE_DAT	0x20
+
+#define	HIZCRB			((vu_short *)0xA405015A)
+
+/* data */
+#define CPLD_NOMAL_START	0xA0A80000
+#define CPLD_SAFE_START		0xA0AC0000
+#define MODE_SW				(vu_char *)0xA405012A
+
+static void init_cpld_loader(void)
+{
+
+	*SCSCR = SCSCR_CLR;
+	*SCFCR = SCFCR_INIT;
+	*SCSMR = SCSMR_INIT;
+
+	*SCBRR = BPS_SETTING_VALUE;
+
+	*RFCR = RFCR_CLR; /* Refresh counter clear */
+
+	while (*RFCR < WAIT_RFCR_COUNTER)
+		;
+
+	*SCFCR = 0x0; /* RTRG=00, TTRG=00 */
+				  /* MCE=0,TFRST=0,RFRST=0,LOOP=0 */
+	*SCSCR = SCSCR_INIT;
+}
+
+static int check_write_ready(void)
+{
+	u16 status = *SC_SR;
+	return status & SCI_TD_E;
+}
+
+static void write_cpld_data(char ch)
+{
+	while (!check_write_ready())
+		;
+
+	*SC_TDR = ch;
+	*SC_SR;
+	*SC_SR = SCI_TDRE_CLEAR;
+}
+
+static int delay(void)
+{
+	int i;
+	int c = 0;
+	for (i = 0; i < 200; i++) {
+		c = *(volatile int *)0xa0000000;
+	}
+	return c;
+}
+
+/***********************************************************************
+ *
+ * Function:     slave_serial
+ *
+ * Description:  Initiates SlaveSerial Configuration.
+ *               Calls ShiftDataOut() to output serial data
+ *
+ ***********************************************************************/
+static void slave_serial(void)
+{
+	int i;
+	unsigned char *flash;
+
+	*CPLD_PROG_ADR |= CPLD_PROG_DAT; /* PROGRAM_OE HIGH */
+	delay();
+
+	/*
+	 * Toggle Program Pin by Toggling Program_OE bit
+	 * This is accomplished by writing to the Program Register in the CPLD
+	 *
+	 * NOTE: The Program_OE bit should be driven high to bring the Virtex
+	 *      Program Pin low. Likewise, it should be driven low
+	 *      to bring the Virtex Program Pin to High-Z
+	 */
+
+	*CPLD_PROG_ADR &= ~CPLD_PROG_DAT; /* PROGRAM_OE LOW */
+	delay();
+
+	/*
+	 * Bring Program High-Z
+	 * (Drive Program_OE bit low to bring Virtex Program Pin to High-Z
+	 */
+
+	/* Program_OE bit Low brings the Virtex Program Pin to High Z: */
+	*CPLD_PROG_ADR |= CPLD_PROG_DAT; /* PROGRAM_OE HIGH */
+
+	while ((*CPLD_INIT_ADR & CPLD_INIT_DAT) == 0)
+		delay();
+
+	/* Begin Slave-Serial Configuration */
+	flash = (unsigned char *)CPLD_NOMAL_START;
+
+	for (i = 0; i < CPLD_DATA_SIZE; i++)
+		write_cpld_data(*flash++);
+}
+
+/***********************************************************************
+ *
+ * Function: check_done_bit
+ *
+ * Description: This function takes monitors the CPLD Input Register
+ * 		   by checking the status of the DONE bit in that Register.
+ *               By doing so, it monitors the Xilinx Virtex device's DONE
+ *               Pin to see if configuration bitstream has been properly
+ *               loaded
+ *
+ ***********************************************************************/
+static void check_done_bit(void)
+{
+	while (!(*CPLD_DONE_ADR & CPLD_DONE_DAT))
+		;
+}
+
+/***********************************************************************
+ *
+ * Function: init_cpld
+ *
+ * Description: Begins Slave Serial configuration of Xilinx FPGA
+ *
+ ***********************************************************************/
+void init_cpld(void)
+{
+	/* Init serial device */
+	init_cpld_loader();
+
+	if (*CPLD_DONE_ADR & CPLD_DONE_DAT)	/* Already DONE */
+		return;
+
+	*HIZCRB = 0x0000;
+	*CPLD_PFC_ADR = 0x7c00;			/* FPGA PROG = OUTPUT */
+
+	/* write CPLD data from NOR flash to device */
+	slave_serial();
+
+	/*
+	 * Monitor the DONE bit in the CPLD Input Register to see if
+	 * configuration successful
+	 */
+
+	check_done_bit();
+}