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/keymile/km_arm/fpga_config.c

@@ -0,0 +1,265 @@
+/*
+ * (C) Copyright 2012
+ * Valentin Lontgchamp, Keymile AG, valentin.longchamp@keymile.com
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <asm/errno.h>
+
+/* GPIO Pin from kirkwood connected to PROGRAM_B pin of the xilinx FPGA */
+#define KM_XLX_PROGRAM_B_PIN    39
+
+#define BOCO_ADDR	0x10
+
+#define ID_REG		0x00
+#define BOCO2_ID	0x5b
+
+static int check_boco2(void)
+{
+	int ret;
+	u8 id;
+
+	ret = i2c_read(BOCO_ADDR, ID_REG, 1, &id, 1);
+	if (ret) {
+		printf("%s: error reading the BOCO id !!\n", __func__);
+		return ret;
+	}
+
+	return (id == BOCO2_ID);
+}
+
+static int boco_clear_bits(u8 reg, u8 flags)
+{
+	int ret;
+	u8 regval;
+
+	/* give access to the EEPROM from FPGA */
+	ret = i2c_read(BOCO_ADDR, reg, 1, &regval, 1);
+	if (ret) {
+		printf("%s: error reading the BOCO @%#x !!\n",
+			__func__, reg);
+		return ret;
+	}
+	regval &= ~flags;
+	ret = i2c_write(BOCO_ADDR, reg, 1, &regval, 1);
+	if (ret) {
+		printf("%s: error writing the BOCO @%#x !!\n",
+			__func__, reg);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int boco_set_bits(u8 reg, u8 flags)
+{
+	int ret;
+	u8 regval;
+
+	/* give access to the EEPROM from FPGA */
+	ret = i2c_read(BOCO_ADDR, reg, 1, &regval, 1);
+	if (ret) {
+		printf("%s: error reading the BOCO @%#x !!\n",
+			__func__, reg);
+		return ret;
+	}
+	regval |= flags;
+	ret = i2c_write(BOCO_ADDR, reg, 1, &regval, 1);
+	if (ret) {
+		printf("%s: error writing the BOCO @%#x !!\n",
+			__func__, reg);
+		return ret;
+	}
+
+	return 0;
+}
+
+#define SPI_REG		0x06
+#define CFG_EEPROM	0x02
+#define FPGA_PROG	0x04
+#define FPGA_INIT_B	0x10
+#define FPGA_DONE	0x20
+
+static int fpga_done(void)
+{
+	int ret = 0;
+	u8 regval;
+
+	/* this is only supported with the boco2 design */
+	if (!check_boco2())
+		return 0;
+
+	ret = i2c_read(BOCO_ADDR, SPI_REG, 1, &regval, 1);
+	if (ret) {
+		printf("%s: error reading the BOCO @%#x !!\n",
+			__func__, SPI_REG);
+		return 0;
+	}
+
+	return regval & FPGA_DONE ? 1 : 0;
+}
+
+int skip;
+
+int trigger_fpga_config(void)
+{
+	int ret = 0;
+
+	/* if the FPGA is already configured, we do not want to
+	 * reconfigure it */
+	skip = 0;
+	if (fpga_done()) {
+		printf("PCIe FPGA config: skipped\n");
+		skip = 1;
+		return 0;
+	}
+
+	if (check_boco2()) {
+		/* we have a BOCO2, this has to be triggered here */
+
+		/* make sure the FPGA_can access the EEPROM */
+		ret = boco_clear_bits(SPI_REG, CFG_EEPROM);
+		if (ret)
+			return ret;
+
+		/* trigger the config start */
+		ret = boco_clear_bits(SPI_REG, FPGA_PROG | FPGA_INIT_B);
+		if (ret)
+			return ret;
+
+		/* small delay for the pulse */
+		udelay(10);
+
+		/* up signal for pulse end */
+		ret = boco_set_bits(SPI_REG, FPGA_PROG);
+		if (ret)
+			return ret;
+
+		/* finally, raise INIT_B to remove the config delay */
+		ret = boco_set_bits(SPI_REG, FPGA_INIT_B);
+		if (ret)
+			return ret;
+
+	} else {
+		/* we do it the old way, with the gpio pin */
+		kw_gpio_set_valid(KM_XLX_PROGRAM_B_PIN, 1);
+		kw_gpio_direction_output(KM_XLX_PROGRAM_B_PIN, 0);
+		/* small delay for the pulse */
+		udelay(10);
+		kw_gpio_direction_input(KM_XLX_PROGRAM_B_PIN);
+	}
+
+	return 0;
+}
+
+int wait_for_fpga_config(void)
+{
+	int ret = 0;
+	u8 spictrl;
+	u32 timeout = 20000;
+
+	if (skip)
+		return 0;
+
+	if (!check_boco2()) {
+		/* we do not have BOCO2, this is not really used */
+		return 0;
+	}
+
+	printf("PCIe FPGA config:");
+	do {
+		ret = i2c_read(BOCO_ADDR, SPI_REG, 1, &spictrl, 1);
+		if (ret) {
+			printf("%s: error reading the BOCO spictrl !!\n",
+				__func__);
+			return ret;
+		}
+		if (timeout-- == 0) {
+			printf(" FPGA_DONE timeout\n");
+			return -EFAULT;
+		}
+		udelay(10);
+	} while (!(spictrl & FPGA_DONE));
+
+	printf(" done\n");
+
+	return 0;
+}
+
+#if defined(KM_PCIE_RESET_MPP7)
+
+#define KM_PEX_RST_GPIO_PIN	7
+int fpga_reset(void)
+{
+	if (!check_boco2()) {
+		/* we do not have BOCO2, this is not really used */
+		return 0;
+	}
+
+	printf("PCIe reset through GPIO7: ");
+	/* apply PCIe reset via GPIO */
+	kw_gpio_set_valid(KM_PEX_RST_GPIO_PIN, 1);
+	kw_gpio_direction_output(KM_PEX_RST_GPIO_PIN, 1);
+	kw_gpio_set_value(KM_PEX_RST_GPIO_PIN, 0);
+	udelay(1000*10);
+	kw_gpio_set_value(KM_PEX_RST_GPIO_PIN, 1);
+
+	printf(" done\n");
+
+	return 0;
+}
+
+#else
+
+#define PRST1		0x4
+#define PCIE_RST	0x10
+#define TRAFFIC_RST	0x04
+
+int fpga_reset(void)
+{
+	int ret = 0;
+	u8 resets;
+
+	if (!check_boco2()) {
+		/* we do not have BOCO2, this is not really used */
+		return 0;
+	}
+
+	/* if we have skipped, we only want to reset the PCIe part */
+	resets = skip ? PCIE_RST : PCIE_RST | TRAFFIC_RST;
+
+	ret = boco_clear_bits(PRST1, resets);
+	if (ret)
+		return ret;
+
+	/* small delay for the pulse */
+	udelay(10);
+
+	ret = boco_set_bits(PRST1, resets);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+#endif
+
+/* the FPGA was configured, we configure the BOCO2 so that the EEPROM
+ * is available from the Bobcat SPI bus */
+int toggle_eeprom_spi_bus(void)
+{
+	int ret = 0;
+
+	if (!check_boco2()) {
+		/* we do not have BOCO2, this is not really used */
+		return 0;
+	}
+
+	ret = boco_set_bits(SPI_REG, CFG_EEPROM);
+	if (ret)
+		return ret;
+
+	return 0;
+}