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/stout/cpld.c

@@ -0,0 +1,167 @@
+/*
+ * Stout board CPLD access support
+ *
+ * Copyright (C) 2015 Renesas Electronics Europe GmbH
+ * Copyright (C) 2015 Renesas Electronics Corporation
+ * Copyright (C) 2015 Cogent Embedded, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+#include "cpld.h"
+
+#define SCLK			GPIO_GP_3_24
+#define SSTBZ			GPIO_GP_3_25
+#define MOSI			GPIO_GP_3_26
+#define MISO			GPIO_GP_3_27
+
+#define CPLD_ADDR_MODE		0x00 /* RW */
+#define CPLD_ADDR_MUX		0x01 /* RW */
+#define CPLD_ADDR_HDMI		0x02 /* RW */
+#define CPLD_ADDR_DIPSW		0x08 /* R */
+#define CPLD_ADDR_RESET		0x80 /* RW */
+#define CPLD_ADDR_VERSION	0xFF /* R */
+
+static u32 cpld_read(u8 addr)
+{
+	int i;
+	u32 data = 0;
+
+	for (i = 0; i < 8; i++) {
+		gpio_set_value(MOSI, addr & 0x80); /* MSB first */
+		gpio_set_value(SCLK, 1);
+		addr <<= 1;
+		gpio_set_value(SCLK, 0);
+	}
+
+	gpio_set_value(MOSI, 0); /* READ */
+	gpio_set_value(SSTBZ, 0);
+	gpio_set_value(SCLK, 1);
+	gpio_set_value(SCLK, 0);
+	gpio_set_value(SSTBZ, 1);
+
+	for (i = 0; i < 32; i++) {
+		gpio_set_value(SCLK, 1);
+		data <<= 1;
+		data |= gpio_get_value(MISO); /* MSB first */
+		gpio_set_value(SCLK, 0);
+	}
+
+	return data;
+}
+
+static void cpld_write(u8 addr, u32 data)
+{
+	int i;
+
+	for (i = 0; i < 32; i++) {
+		gpio_set_value(MOSI, data & (1 << 31)); /* MSB first */
+		gpio_set_value(SCLK, 1);
+		data <<= 1;
+		gpio_set_value(SCLK, 0);
+	}
+
+	for (i = 0; i < 8; i++) {
+		gpio_set_value(MOSI, addr & 0x80); /* MSB first */
+		gpio_set_value(SCLK, 1);
+		addr <<= 1;
+		gpio_set_value(SCLK, 0);
+	}
+
+	gpio_set_value(MOSI, 1); /* WRITE */
+	gpio_set_value(SSTBZ, 0);
+	gpio_set_value(SCLK, 1);
+	gpio_set_value(SCLK, 0);
+	gpio_set_value(SSTBZ, 1);
+}
+
+/* LSI pin pull-up control */
+#define PUPR3		0xe606010C
+#define PUPR3_SD3_DAT1	(1 << 27)
+
+void cpld_init(void)
+{
+	u32 val;
+
+	/* PULL-UP on MISO line */
+	val = readl(PUPR3);
+	val |= PUPR3_SD3_DAT1;
+	writel(val, PUPR3);
+
+	gpio_request(SCLK, NULL);
+	gpio_request(SSTBZ, NULL);
+	gpio_request(MOSI, NULL);
+	gpio_request(MISO, NULL);
+
+	gpio_direction_output(SCLK, 0);
+	gpio_direction_output(SSTBZ, 1);
+	gpio_direction_output(MOSI, 0);
+	gpio_direction_input(MISO);
+
+	/* dummy read */
+	cpld_read(CPLD_ADDR_VERSION);
+
+	printf("CPLD version:              0x%08x\n",
+	       cpld_read(CPLD_ADDR_VERSION));
+	printf("H2 Mode setting (MD0..28): 0x%08x\n",
+	       cpld_read(CPLD_ADDR_MODE));
+	printf("Multiplexer settings:      0x%08x\n",
+	       cpld_read(CPLD_ADDR_MUX));
+	printf("HDMI setting:              0x%08x\n",
+	       cpld_read(CPLD_ADDR_HDMI));
+	printf("DIPSW (SW3):               0x%08x\n",
+	       cpld_read(CPLD_ADDR_DIPSW));
+
+#ifdef CONFIG_SH_SDHI
+	/* switch MUX to SD0 */
+	val = cpld_read(CPLD_ADDR_MUX);
+	val &= ~MUX_MSK_SD0;
+	val |= MUX_VAL_SD0;
+	cpld_write(CPLD_ADDR_MUX, val);
+#endif
+}
+
+static int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	u32 addr, val;
+
+	if (argc < 3)
+		return CMD_RET_USAGE;
+
+	addr = simple_strtoul(argv[2], NULL, 16);
+	if (!(addr == CPLD_ADDR_VERSION || addr == CPLD_ADDR_MODE ||
+	      addr == CPLD_ADDR_MUX || addr == CPLD_ADDR_HDMI ||
+	      addr == CPLD_ADDR_DIPSW || addr == CPLD_ADDR_RESET)) {
+		printf("cpld invalid addr\n");
+		return CMD_RET_USAGE;
+	}
+
+	if (argc == 3 && strcmp(argv[1], "read") == 0) {
+		printf("0x%x\n", cpld_read(addr));
+	} else if (argc == 4 && strcmp(argv[1], "write") == 0) {
+		val = simple_strtoul(argv[3], NULL, 16);
+		if (addr == CPLD_ADDR_MUX) {
+			/* never mask SCIFA0 console */
+			val &= ~MUX_MSK_SCIFA0_USB;
+			val |= MUX_VAL_SCIFA0_USB;
+		}
+		cpld_write(addr, val);
+	}
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	cpld, 4, 1, do_cpld,
+	"CPLD access",
+	"read addr\n"
+	"cpld write addr val\n"
+);
+
+void reset_cpu(ulong addr)
+{
+	cpld_write(CPLD_ADDR_RESET, 1);
+}