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/freescale/mpc837xemds/pci.c

@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2006-2009 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm/mmu.h>
+#include <asm/io.h>
+#include <common.h>
+#include <mpc83xx.h>
+#include <pci.h>
+#include <i2c.h>
+#include <fdt_support.h>
+#include <asm/fsl_i2c.h>
+#include <asm/fsl_mpc83xx_serdes.h>
+
+static struct pci_region pci_regions[] = {
+	{
+		bus_start: CONFIG_SYS_PCI_MEM_BASE,
+		phys_start: CONFIG_SYS_PCI_MEM_PHYS,
+		size: CONFIG_SYS_PCI_MEM_SIZE,
+		flags: PCI_REGION_MEM | PCI_REGION_PREFETCH
+	},
+	{
+		bus_start: CONFIG_SYS_PCI_MMIO_BASE,
+		phys_start: CONFIG_SYS_PCI_MMIO_PHYS,
+		size: CONFIG_SYS_PCI_MMIO_SIZE,
+		flags: PCI_REGION_MEM
+	},
+	{
+		bus_start: CONFIG_SYS_PCI_IO_BASE,
+		phys_start: CONFIG_SYS_PCI_IO_PHYS,
+		size: CONFIG_SYS_PCI_IO_SIZE,
+		flags: PCI_REGION_IO
+	}
+};
+
+static struct pci_region pcie_regions_0[] = {
+	{
+		.bus_start = CONFIG_SYS_PCIE1_MEM_BASE,
+		.phys_start = CONFIG_SYS_PCIE1_MEM_PHYS,
+		.size = CONFIG_SYS_PCIE1_MEM_SIZE,
+		.flags = PCI_REGION_MEM,
+	},
+	{
+		.bus_start = CONFIG_SYS_PCIE1_IO_BASE,
+		.phys_start = CONFIG_SYS_PCIE1_IO_PHYS,
+		.size = CONFIG_SYS_PCIE1_IO_SIZE,
+		.flags = PCI_REGION_IO,
+	},
+};
+
+static struct pci_region pcie_regions_1[] = {
+	{
+		.bus_start = CONFIG_SYS_PCIE2_MEM_BASE,
+		.phys_start = CONFIG_SYS_PCIE2_MEM_PHYS,
+		.size = CONFIG_SYS_PCIE2_MEM_SIZE,
+		.flags = PCI_REGION_MEM,
+	},
+	{
+		.bus_start = CONFIG_SYS_PCIE2_IO_BASE,
+		.phys_start = CONFIG_SYS_PCIE2_IO_PHYS,
+		.size = CONFIG_SYS_PCIE2_IO_SIZE,
+		.flags = PCI_REGION_IO,
+	},
+};
+
+static int is_pex_x2(void)
+{
+	const char *pex_x2 = getenv("pex_x2");
+
+	if (pex_x2 && !strcmp(pex_x2, "yes"))
+		return 1;
+	return 0;
+}
+
+void pci_init_board(void)
+{
+	volatile immap_t *immr = (volatile immap_t *)CONFIG_SYS_IMMR;
+	volatile sysconf83xx_t *sysconf = &immr->sysconf;
+	volatile clk83xx_t *clk = (volatile clk83xx_t *)&immr->clk;
+	volatile law83xx_t *pci_law = immr->sysconf.pcilaw;
+	volatile law83xx_t *pcie_law = sysconf->pcielaw;
+	struct pci_region *reg[] = { pci_regions };
+	struct pci_region *pcie_reg[] = { pcie_regions_0, pcie_regions_1, };
+	u32 spridr = in_be32(&immr->sysconf.spridr);
+	int pex2 = is_pex_x2();
+
+	if (board_pci_host_broken())
+		goto skip_pci;
+
+	/* Enable all 5 PCI_CLK_OUTPUTS */
+	clk->occr |= 0xf8000000;
+	udelay(2000);
+
+	/* Configure PCI Local Access Windows */
+	pci_law[0].bar = CONFIG_SYS_PCI_MEM_PHYS & LAWBAR_BAR;
+	pci_law[0].ar = LBLAWAR_EN | LBLAWAR_512MB;
+
+	pci_law[1].bar = CONFIG_SYS_PCI_IO_PHYS & LAWBAR_BAR;
+	pci_law[1].ar = LBLAWAR_EN | LBLAWAR_1MB;
+
+	udelay(2000);
+
+	mpc83xx_pci_init(1, reg);
+skip_pci:
+	/* There is no PEX in MPC8379 parts. */
+	if (PARTID_NO_E(spridr) == SPR_8379)
+		return;
+
+	if (pex2)
+		fsl_setup_serdes(CONFIG_FSL_SERDES2, FSL_SERDES_PROTO_PEX_X2,
+				 FSL_SERDES_CLK_100, FSL_SERDES_VDD_1V);
+	else
+		fsl_setup_serdes(CONFIG_FSL_SERDES2, FSL_SERDES_PROTO_PEX,
+				 FSL_SERDES_CLK_100, FSL_SERDES_VDD_1V);
+
+	/* Configure the clock for PCIE controller */
+	clrsetbits_be32(&clk->sccr, SCCR_PCIEXP1CM | SCCR_PCIEXP2CM,
+				    SCCR_PCIEXP1CM_1 | SCCR_PCIEXP2CM_1);
+
+	/* Deassert the resets in the control register */
+	out_be32(&sysconf->pecr1, 0xE0008000);
+	if (!pex2)
+		out_be32(&sysconf->pecr2, 0xE0008000);
+	udelay(2000);
+
+	/* Configure PCI Express Local Access Windows */
+	out_be32(&pcie_law[0].bar, CONFIG_SYS_PCIE1_BASE & LAWBAR_BAR);
+	out_be32(&pcie_law[0].ar, LBLAWAR_EN | LBLAWAR_512MB);
+
+	out_be32(&pcie_law[1].bar, CONFIG_SYS_PCIE2_BASE & LAWBAR_BAR);
+	out_be32(&pcie_law[1].ar, LBLAWAR_EN | LBLAWAR_512MB);
+
+	mpc83xx_pcie_init(pex2 ? 1 : 2, pcie_reg);
+}
+
+void ft_pcie_fixup(void *blob, bd_t *bd)
+{
+	const char *status = "disabled (PCIE1 is x2)";
+
+	if (!is_pex_x2())
+		return;
+
+	do_fixup_by_path(blob, "pci2", "status", status,
+			 strlen(status) + 1, 1);
+}