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/arm/mach-mvebu/dram.c

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+/*
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/soc.h>
+
+#if defined(CONFIG_ARCH_MVEBU)
+/* Use common XOR definitions for A3x and AXP */
+#include "../../../drivers/ddr/marvell/axp/xor.h"
+#include "../../../drivers/ddr/marvell/axp/xor_regs.h"
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct sdram_bank {
+	u32	win_bar;
+	u32	win_sz;
+};
+
+struct sdram_addr_dec {
+	struct sdram_bank sdram_bank[4];
+};
+
+#define REG_CPUCS_WIN_ENABLE		(1 << 0)
+#define REG_CPUCS_WIN_WR_PROTECT	(1 << 1)
+#define REG_CPUCS_WIN_WIN0_CS(x)	(((x) & 0x3) << 2)
+#define REG_CPUCS_WIN_SIZE(x)		(((x) & 0xff) << 24)
+
+#define SDRAM_SIZE_MAX			0xc0000000
+
+#define SCRUB_MAGIC		0xbeefdead
+
+#define SCRB_XOR_UNIT		0
+#define SCRB_XOR_CHAN		1
+#define SCRB_XOR_WIN		0
+
+#define XEBARX_BASE_OFFS	16
+
+/*
+ * mvebu_sdram_bar - reads SDRAM Base Address Register
+ */
+u32 mvebu_sdram_bar(enum memory_bank bank)
+{
+	struct sdram_addr_dec *base =
+		(struct sdram_addr_dec *)MVEBU_SDRAM_BASE;
+	u32 result = 0;
+	u32 enable = 0x01 & readl(&base->sdram_bank[bank].win_sz);
+
+	if ((!enable) || (bank > BANK3))
+		return 0;
+
+	result = readl(&base->sdram_bank[bank].win_bar);
+	return result;
+}
+
+/*
+ * mvebu_sdram_bs_set - writes SDRAM Bank size
+ */
+static void mvebu_sdram_bs_set(enum memory_bank bank, u32 size)
+{
+	struct sdram_addr_dec *base =
+		(struct sdram_addr_dec *)MVEBU_SDRAM_BASE;
+	/* Read current register value */
+	u32 reg = readl(&base->sdram_bank[bank].win_sz);
+
+	/* Clear window size */
+	reg &= ~REG_CPUCS_WIN_SIZE(0xFF);
+
+	/* Set new window size */
+	reg |= REG_CPUCS_WIN_SIZE((size - 1) >> 24);
+
+	writel(reg, &base->sdram_bank[bank].win_sz);
+}
+
+/*
+ * mvebu_sdram_bs - reads SDRAM Bank size
+ */
+u32 mvebu_sdram_bs(enum memory_bank bank)
+{
+	struct sdram_addr_dec *base =
+		(struct sdram_addr_dec *)MVEBU_SDRAM_BASE;
+	u32 result = 0;
+	u32 enable = 0x01 & readl(&base->sdram_bank[bank].win_sz);
+
+	if ((!enable) || (bank > BANK3))
+		return 0;
+	result = 0xff000000 & readl(&base->sdram_bank[bank].win_sz);
+	result += 0x01000000;
+	return result;
+}
+
+void mvebu_sdram_size_adjust(enum memory_bank bank)
+{
+	u32 size;
+
+	/* probe currently equipped RAM size */
+	size = get_ram_size((void *)mvebu_sdram_bar(bank),
+			    mvebu_sdram_bs(bank));
+
+	/* adjust SDRAM window size accordingly */
+	mvebu_sdram_bs_set(bank, size);
+}
+
+#if defined(CONFIG_ARCH_MVEBU)
+static u32 xor_ctrl_save;
+static u32 xor_base_save;
+static u32 xor_mask_save;
+
+static void mv_xor_init2(u32 cs)
+{
+	u32 reg, base, size, base2;
+	u32 bank_attr[4] = { 0xe00, 0xd00, 0xb00, 0x700 };
+
+	xor_ctrl_save = reg_read(XOR_WINDOW_CTRL_REG(SCRB_XOR_UNIT,
+						     SCRB_XOR_CHAN));
+	xor_base_save = reg_read(XOR_BASE_ADDR_REG(SCRB_XOR_UNIT,
+						   SCRB_XOR_WIN));
+	xor_mask_save = reg_read(XOR_SIZE_MASK_REG(SCRB_XOR_UNIT,
+						   SCRB_XOR_WIN));
+
+	/* Enable Window x for each CS */
+	reg = 0x1;
+	reg |= (0x3 << 16);
+	reg_write(XOR_WINDOW_CTRL_REG(SCRB_XOR_UNIT, SCRB_XOR_CHAN), reg);
+
+	base = 0;
+	size = mvebu_sdram_bs(cs) - 1;
+	if (size) {
+		base2 = ((base / (64 << 10)) << XEBARX_BASE_OFFS) |
+			bank_attr[cs];
+		reg_write(XOR_BASE_ADDR_REG(SCRB_XOR_UNIT, SCRB_XOR_WIN),
+			  base2);
+
+		base += size + 1;
+		size = (size / (64 << 10)) << 16;
+		/* Window x - size - 256 MB */
+		reg_write(XOR_SIZE_MASK_REG(SCRB_XOR_UNIT, SCRB_XOR_WIN), size);
+	}
+
+	mv_xor_hal_init(0);
+
+	return;
+}
+
+static void mv_xor_finish2(void)
+{
+	reg_write(XOR_WINDOW_CTRL_REG(SCRB_XOR_UNIT, SCRB_XOR_CHAN),
+		  xor_ctrl_save);
+	reg_write(XOR_BASE_ADDR_REG(SCRB_XOR_UNIT, SCRB_XOR_WIN),
+		  xor_base_save);
+	reg_write(XOR_SIZE_MASK_REG(SCRB_XOR_UNIT, SCRB_XOR_WIN),
+		  xor_mask_save);
+}
+
+static void dram_ecc_scrubbing(void)
+{
+	int cs;
+	u32 size, temp;
+	u32 total_mem = 0;
+	u64 total;
+	u32 start_addr;
+
+	/*
+	 * The DDR training code from the bin_hdr / SPL already
+	 * scrubbed the DDR till 0x1000000. And the main U-Boot
+	 * is loaded to an address < 0x1000000. So we need to
+	 * skip this range to not re-scrub this area again.
+	 */
+	temp = reg_read(REG_SDRAM_CONFIG_ADDR);
+	temp |= (1 << REG_SDRAM_CONFIG_IERR_OFFS);
+	reg_write(REG_SDRAM_CONFIG_ADDR, temp);
+
+	for (cs = 0; cs < CONFIG_NR_DRAM_BANKS; cs++) {
+		size = mvebu_sdram_bs(cs) - 1;
+		if (size == 0)
+			continue;
+
+		total = (u64)size + 1;
+		total_mem += (u32)(total / (1 << 30));
+		start_addr = 0;
+		mv_xor_init2(cs);
+
+		/* Skip first 16 MiB */
+		if (0 == cs) {
+			start_addr = 0x1000000;
+			size -= start_addr;
+		}
+
+		mv_xor_mem_init(SCRB_XOR_CHAN, start_addr, size,
+				SCRUB_MAGIC, SCRUB_MAGIC);
+
+		/* Wait for previous transfer completion */
+		while (mv_xor_state_get(SCRB_XOR_CHAN) != MV_IDLE)
+			;
+
+		mv_xor_finish2();
+	}
+
+	temp = reg_read(REG_SDRAM_CONFIG_ADDR);
+	temp &= ~(1 << REG_SDRAM_CONFIG_IERR_OFFS);
+	reg_write(REG_SDRAM_CONFIG_ADDR, temp);
+}
+
+static int ecc_enabled(void)
+{
+	if (reg_read(REG_SDRAM_CONFIG_ADDR) & (1 << REG_SDRAM_CONFIG_ECC_OFFS))
+		return 1;
+
+	return 0;
+}
+#else
+static void dram_ecc_scrubbing(void)
+{
+}
+
+static int ecc_enabled(void)
+{
+	return 0;
+}
+#endif
+
+int dram_init(void)
+{
+	u64 size = 0;
+	int i;
+
+	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+		/*
+		 * It is assumed that all memory banks are consecutive
+		 * and without gaps.
+		 * If the gap is found, ram_size will be reported for
+		 * consecutive memory only
+		 */
+		if (mvebu_sdram_bar(i) != size)
+			break;
+
+		/*
+		 * Don't report more than 3GiB of SDRAM, otherwise there is no
+		 * address space left for the internal registers etc.
+		 */
+		size += mvebu_sdram_bs(i);
+		if (size > SDRAM_SIZE_MAX)
+			size = SDRAM_SIZE_MAX;
+	}
+
+	for (; i < CONFIG_NR_DRAM_BANKS; i++) {
+		/* If above loop terminated prematurely, we need to set
+		 * remaining banks' start address & size as 0. Otherwise other
+		 * u-boot functions and Linux kernel gets wrong values which
+		 * could result in crash */
+		gd->bd->bi_dram[i].start = 0;
+		gd->bd->bi_dram[i].size = 0;
+	}
+
+
+	if (ecc_enabled())
+		dram_ecc_scrubbing();
+
+	gd->ram_size = size;
+
+	return 0;
+}
+
+/*
+ * If this function is not defined here,
+ * board.c alters dram bank zero configuration defined above.
+ */
+void dram_init_banksize(void)
+{
+	u64 size = 0;
+	int i;
+
+	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+		gd->bd->bi_dram[i].start = mvebu_sdram_bar(i);
+		gd->bd->bi_dram[i].size = mvebu_sdram_bs(i);
+
+		/* Clip the banksize to 1GiB if it exceeds the max size */
+		size += gd->bd->bi_dram[i].size;
+		if (size > SDRAM_SIZE_MAX)
+			mvebu_sdram_bs_set(i, 0x40000000);
+	}
+}
+
+#if defined(CONFIG_ARCH_MVEBU)
+void board_add_ram_info(int use_default)
+{
+	struct sar_freq_modes sar_freq;
+
+	get_sar_freq(&sar_freq);
+	printf(" (%d MHz, ", sar_freq.d_clk);
+
+	if (ecc_enabled())
+		printf("ECC");
+	else
+		printf("ECC not");
+	printf(" enabled)");
+}
+#endif