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![Etienne Carriere](/assets/img/avatar_default.png)
Add boolean input argument @no_map to helper function fdtdec_add_reserved_memory() to add or not "no-map" property for an added reserved memory node. Property no-map is used by the Linux kernel to not not map memory in its static memory mapping. It is needed for example for the| consistency of system non-cached memory and to prevent speculative accesses to some firewalled memory. No functional change. A later change will update to OPTEE library to add no-map property to OP-TEE reserved memory nodes. Signed-off-by: Etienne Carriere <etienne.carriere@st.com> Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
1219 lines
44 KiB
C
1219 lines
44 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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*/
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#ifndef __fdtdec_h
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#define __fdtdec_h
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/*
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* This file contains convenience functions for decoding useful and
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* enlightening information from FDTs. It is intended to be used by device
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* drivers and board-specific code within U-Boot. It aims to reduce the
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* amount of FDT munging required within U-Boot itself, so that driver code
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* changes to support FDT are minimized.
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*/
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#include <linux/libfdt.h>
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#include <pci.h>
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/*
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* A typedef for a physical address. Note that fdt data is always big
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* endian even on a litle endian machine.
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*/
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typedef phys_addr_t fdt_addr_t;
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typedef phys_size_t fdt_size_t;
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#ifdef CONFIG_PHYS_64BIT
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#define FDT_ADDR_T_NONE (-1U)
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#define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
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#define fdt_size_to_cpu(reg) be64_to_cpu(reg)
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#define cpu_to_fdt_addr(reg) cpu_to_be64(reg)
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#define cpu_to_fdt_size(reg) cpu_to_be64(reg)
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typedef fdt64_t fdt_val_t;
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#else
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#define FDT_ADDR_T_NONE (-1U)
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#define fdt_addr_to_cpu(reg) be32_to_cpu(reg)
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#define fdt_size_to_cpu(reg) be32_to_cpu(reg)
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#define cpu_to_fdt_addr(reg) cpu_to_be32(reg)
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#define cpu_to_fdt_size(reg) cpu_to_be32(reg)
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typedef fdt32_t fdt_val_t;
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#endif
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/* Information obtained about memory from the FDT */
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struct fdt_memory {
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fdt_addr_t start;
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fdt_addr_t end;
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};
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struct bd_info;
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#ifdef CONFIG_SPL_BUILD
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#define SPL_BUILD 1
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#else
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#define SPL_BUILD 0
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#endif
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#ifdef CONFIG_OF_PRIOR_STAGE
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extern phys_addr_t prior_stage_fdt_address;
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#endif
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/*
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* Information about a resource. start is the first address of the resource
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* and end is the last address (inclusive). The length of the resource will
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* be equal to: end - start + 1.
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*/
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struct fdt_resource {
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fdt_addr_t start;
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fdt_addr_t end;
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};
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enum fdt_pci_space {
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FDT_PCI_SPACE_CONFIG = 0,
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FDT_PCI_SPACE_IO = 0x01000000,
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FDT_PCI_SPACE_MEM32 = 0x02000000,
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FDT_PCI_SPACE_MEM64 = 0x03000000,
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FDT_PCI_SPACE_MEM32_PREF = 0x42000000,
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FDT_PCI_SPACE_MEM64_PREF = 0x43000000,
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};
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#define FDT_PCI_ADDR_CELLS 3
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#define FDT_PCI_SIZE_CELLS 2
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#define FDT_PCI_REG_SIZE \
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((FDT_PCI_ADDR_CELLS + FDT_PCI_SIZE_CELLS) * sizeof(u32))
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/*
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* The Open Firmware spec defines PCI physical address as follows:
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*
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* bits# 31 .... 24 23 .... 16 15 .... 08 07 .... 00
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*
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* phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr
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* phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
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* phys.lo cell: llllllll llllllll llllllll llllllll
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*
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* where:
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*
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* n: is 0 if the address is relocatable, 1 otherwise
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* p: is 1 if addressable region is prefetchable, 0 otherwise
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* t: is 1 if the address is aliased (for non-relocatable I/O) below 1MB
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* (for Memory), or below 64KB (for relocatable I/O)
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* ss: is the space code, denoting the address space
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* bbbbbbbb: is the 8-bit Bus Number
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* ddddd: is the 5-bit Device Number
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* fff: is the 3-bit Function Number
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* rrrrrrrr: is the 8-bit Register Number
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* hhhhhhhh: is a 32-bit unsigned number
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* llllllll: is a 32-bit unsigned number
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*/
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struct fdt_pci_addr {
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u32 phys_hi;
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u32 phys_mid;
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u32 phys_lo;
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};
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extern u8 __dtb_dt_begin[]; /* embedded device tree blob */
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extern u8 __dtb_dt_spl_begin[]; /* embedded device tree blob for SPL/TPL */
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/**
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* Compute the size of a resource.
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*
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* @param res the resource to operate on
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* @return the size of the resource
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*/
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static inline fdt_size_t fdt_resource_size(const struct fdt_resource *res)
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{
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return res->end - res->start + 1;
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}
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/**
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* Compat types that we know about and for which we might have drivers.
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* Each is named COMPAT_<dir>_<filename> where <dir> is the directory
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* within drivers.
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*/
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enum fdt_compat_id {
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COMPAT_UNKNOWN,
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COMPAT_NVIDIA_TEGRA20_EMC, /* Tegra20 memory controller */
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COMPAT_NVIDIA_TEGRA20_EMC_TABLE, /* Tegra20 memory timing table */
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COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */
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COMPAT_NVIDIA_TEGRA124_XUSB_PADCTL,
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/* Tegra124 XUSB pad controller */
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COMPAT_NVIDIA_TEGRA210_XUSB_PADCTL,
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/* Tegra210 XUSB pad controller */
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COMPAT_SMSC_LAN9215, /* SMSC 10/100 Ethernet LAN9215 */
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COMPAT_SAMSUNG_EXYNOS5_SROMC, /* Exynos5 SROMC */
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COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */
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COMPAT_SAMSUNG_EXYNOS5_USB3_PHY,/* Exynos phy controller for usb3.0 */
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COMPAT_SAMSUNG_EXYNOS_TMU, /* Exynos TMU */
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COMPAT_SAMSUNG_EXYNOS_MIPI_DSI, /* Exynos mipi dsi */
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COMPAT_SAMSUNG_EXYNOS_DWMMC, /* Exynos DWMMC controller */
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COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */
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COMPAT_SAMSUNG_EXYNOS_SYSMMU, /* Exynos sysmmu */
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COMPAT_INTEL_MICROCODE, /* Intel microcode update */
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COMPAT_INTEL_QRK_MRC, /* Intel Quark MRC */
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COMPAT_ALTERA_SOCFPGA_DWMAC, /* SoCFPGA Ethernet controller */
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COMPAT_ALTERA_SOCFPGA_DWMMC, /* SoCFPGA DWMMC controller */
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COMPAT_ALTERA_SOCFPGA_DWC2USB, /* SoCFPGA DWC2 USB controller */
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COMPAT_INTEL_BAYTRAIL_FSP, /* Intel Bay Trail FSP */
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COMPAT_INTEL_BAYTRAIL_FSP_MDP, /* Intel FSP memory-down params */
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COMPAT_INTEL_IVYBRIDGE_FSP, /* Intel Ivy Bridge FSP */
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COMPAT_SUNXI_NAND, /* SUNXI NAND controller */
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COMPAT_ALTERA_SOCFPGA_CLK, /* SoCFPGA Clock initialization */
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COMPAT_ALTERA_SOCFPGA_PINCTRL_SINGLE, /* SoCFPGA pinctrl-single */
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COMPAT_ALTERA_SOCFPGA_H2F_BRG, /* SoCFPGA hps2fpga bridge */
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COMPAT_ALTERA_SOCFPGA_LWH2F_BRG, /* SoCFPGA lwhps2fpga bridge */
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COMPAT_ALTERA_SOCFPGA_F2H_BRG, /* SoCFPGA fpga2hps bridge */
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COMPAT_ALTERA_SOCFPGA_F2SDR0, /* SoCFPGA fpga2SDRAM0 bridge */
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COMPAT_ALTERA_SOCFPGA_F2SDR1, /* SoCFPGA fpga2SDRAM1 bridge */
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COMPAT_ALTERA_SOCFPGA_F2SDR2, /* SoCFPGA fpga2SDRAM2 bridge */
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COMPAT_ALTERA_SOCFPGA_FPGA0, /* SOCFPGA FPGA manager */
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COMPAT_ALTERA_SOCFPGA_NOC, /* SOCFPGA Arria 10 NOC */
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COMPAT_ALTERA_SOCFPGA_CLK_INIT, /* SOCFPGA Arria 10 clk init */
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COMPAT_COUNT,
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};
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#define MAX_PHANDLE_ARGS 16
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struct fdtdec_phandle_args {
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int node;
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int args_count;
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uint32_t args[MAX_PHANDLE_ARGS];
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};
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/**
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* fdtdec_parse_phandle_with_args() - Find a node pointed by phandle in a list
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*
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* This function is useful to parse lists of phandles and their arguments.
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*
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* Example:
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*
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* phandle1: node1 {
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* #list-cells = <2>;
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* }
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*
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* phandle2: node2 {
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* #list-cells = <1>;
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* }
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*
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* node3 {
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* list = <&phandle1 1 2 &phandle2 3>;
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* }
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*
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* To get a device_node of the `node2' node you may call this:
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* fdtdec_parse_phandle_with_args(blob, node3, "list", "#list-cells", 0, 1,
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* &args);
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*
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* (This function is a modified version of __of_parse_phandle_with_args() from
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* Linux 3.18)
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*
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* @blob: Pointer to device tree
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* @src_node: Offset of device tree node containing a list
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* @list_name: property name that contains a list
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* @cells_name: property name that specifies the phandles' arguments count,
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* or NULL to use @cells_count
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* @cells_count: Cell count to use if @cells_name is NULL
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* @index: index of a phandle to parse out
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* @out_args: optional pointer to output arguments structure (will be filled)
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* @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
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* @list_name does not exist, a phandle was not found, @cells_name
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* could not be found, the arguments were truncated or there were too
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* many arguments.
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*
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*/
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int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
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const char *list_name,
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const char *cells_name,
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int cell_count, int index,
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struct fdtdec_phandle_args *out_args);
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/**
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* Find the next numbered alias for a peripheral. This is used to enumerate
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* all the peripherals of a certain type.
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*
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* Do the first call with *upto = 0. Assuming /aliases/<name>0 exists then
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* this function will return a pointer to the node the alias points to, and
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* then update *upto to 1. Next time you call this function, the next node
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* will be returned.
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*
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* All nodes returned will match the compatible ID, as it is assumed that
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* all peripherals use the same driver.
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*
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* @param blob FDT blob to use
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* @param name Root name of alias to search for
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* @param id Compatible ID to look for
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* @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
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*/
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int fdtdec_next_alias(const void *blob, const char *name,
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enum fdt_compat_id id, int *upto);
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/**
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* Find the compatible ID for a given node.
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*
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* Generally each node has at least one compatible string attached to it.
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* This function looks through our list of known compatible strings and
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* returns the corresponding ID which matches the compatible string.
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*
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* @param blob FDT blob to use
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* @param node Node containing compatible string to find
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* @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match
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*/
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enum fdt_compat_id fdtdec_lookup(const void *blob, int node);
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/**
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* Find the next compatible node for a peripheral.
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*
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* Do the first call with node = 0. This function will return a pointer to
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* the next compatible node. Next time you call this function, pass the
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* value returned, and the next node will be provided.
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*
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* @param blob FDT blob to use
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* @param node Start node for search
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* @param id Compatible ID to look for (enum fdt_compat_id)
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* @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
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*/
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int fdtdec_next_compatible(const void *blob, int node,
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enum fdt_compat_id id);
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/**
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* Find the next compatible subnode for a peripheral.
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*
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* Do the first call with node set to the parent and depth = 0. This
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* function will return the offset of the next compatible node. Next time
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* you call this function, pass the node value returned last time, with
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* depth unchanged, and the next node will be provided.
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*
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* @param blob FDT blob to use
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* @param node Start node for search
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* @param id Compatible ID to look for (enum fdt_compat_id)
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* @param depthp Current depth (set to 0 before first call)
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* @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
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*/
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int fdtdec_next_compatible_subnode(const void *blob, int node,
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enum fdt_compat_id id, int *depthp);
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/*
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* Look up an address property in a node and return the parsed address, and
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* optionally the parsed size.
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*
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* This variant assumes a known and fixed number of cells are used to
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* represent the address and size.
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*
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* You probably don't want to use this function directly except to parse
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* non-standard properties, and never to parse the "reg" property. Instead,
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* use one of the "auto" variants below, which automatically honor the
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* #address-cells and #size-cells properties in the parent node.
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*
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* @param blob FDT blob
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* @param node node to examine
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* @param prop_name name of property to find
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* @param index which address to retrieve from a list of addresses. Often 0.
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* @param na the number of cells used to represent an address
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* @param ns the number of cells used to represent a size
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* @param sizep a pointer to store the size into. Use NULL if not required
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* @param translate Indicates whether to translate the returned value
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* using the parent node's ranges property.
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* @return address, if found, or FDT_ADDR_T_NONE if not
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*/
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fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node,
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const char *prop_name, int index, int na, int ns,
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fdt_size_t *sizep, bool translate);
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/*
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* Look up an address property in a node and return the parsed address, and
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* optionally the parsed size.
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*
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* This variant automatically determines the number of cells used to represent
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* the address and size by parsing the provided parent node's #address-cells
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* and #size-cells properties.
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*
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* @param blob FDT blob
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* @param parent parent node of @node
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* @param node node to examine
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* @param prop_name name of property to find
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* @param index which address to retrieve from a list of addresses. Often 0.
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* @param sizep a pointer to store the size into. Use NULL if not required
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* @param translate Indicates whether to translate the returned value
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* using the parent node's ranges property.
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* @return address, if found, or FDT_ADDR_T_NONE if not
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*/
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fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent,
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int node, const char *prop_name, int index, fdt_size_t *sizep,
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bool translate);
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/*
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* Look up an address property in a node and return the parsed address, and
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* optionally the parsed size.
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*
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* This variant automatically determines the number of cells used to represent
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* the address and size by parsing the parent node's #address-cells
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* and #size-cells properties. The parent node is automatically found.
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*
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* The automatic parent lookup implemented by this function is slow.
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* Consequently, fdtdec_get_addr_size_auto_parent() should be used where
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* possible.
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*
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* @param blob FDT blob
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* @param parent parent node of @node
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* @param node node to examine
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* @param prop_name name of property to find
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* @param index which address to retrieve from a list of addresses. Often 0.
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* @param sizep a pointer to store the size into. Use NULL if not required
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* @param translate Indicates whether to translate the returned value
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* using the parent node's ranges property.
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* @return address, if found, or FDT_ADDR_T_NONE if not
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*/
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fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node,
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const char *prop_name, int index, fdt_size_t *sizep,
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bool translate);
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/*
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* Look up an address property in a node and return the parsed address.
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*
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* This variant hard-codes the number of cells used to represent the address
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* and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also
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* always returns the first address value in the property (index 0).
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*
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* Use of this function is not recommended due to the hard-coding of cell
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* counts. There is no programmatic validation that these hard-coded values
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* actually match the device tree content in any way at all. This assumption
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* can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately
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* set in the U-Boot build and exercising strict control over DT content to
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* ensure use of matching #address-cells/#size-cells properties. However, this
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* approach is error-prone; those familiar with DT will not expect the
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* assumption to exist, and could easily invalidate it. If the assumption is
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* invalidated, this function will not report the issue, and debugging will
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* be required. Instead, use fdtdec_get_addr_size_auto_parent().
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*
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* @param blob FDT blob
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* @param node node to examine
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* @param prop_name name of property to find
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* @return address, if found, or FDT_ADDR_T_NONE if not
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*/
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fdt_addr_t fdtdec_get_addr(const void *blob, int node,
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const char *prop_name);
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/*
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* Look up an address property in a node and return the parsed address, and
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* optionally the parsed size.
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*
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* This variant hard-codes the number of cells used to represent the address
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* and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also
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* always returns the first address value in the property (index 0).
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*
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* Use of this function is not recommended due to the hard-coding of cell
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* counts. There is no programmatic validation that these hard-coded values
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* actually match the device tree content in any way at all. This assumption
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* can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately
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* set in the U-Boot build and exercising strict control over DT content to
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* ensure use of matching #address-cells/#size-cells properties. However, this
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* approach is error-prone; those familiar with DT will not expect the
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* assumption to exist, and could easily invalidate it. If the assumption is
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* invalidated, this function will not report the issue, and debugging will
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* be required. Instead, use fdtdec_get_addr_size_auto_parent().
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*
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* @param blob FDT blob
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* @param node node to examine
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* @param prop_name name of property to find
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* @param sizep a pointer to store the size into. Use NULL if not required
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* @return address, if found, or FDT_ADDR_T_NONE if not
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*/
|
|
fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
|
|
const char *prop_name, fdt_size_t *sizep);
|
|
|
|
/**
|
|
* Look at the compatible property of a device node that represents a PCI
|
|
* device and extract pci vendor id and device id from it.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param vendor vendor id of the pci device
|
|
* @param device device id of the pci device
|
|
* @return 0 if ok, negative on error
|
|
*/
|
|
int fdtdec_get_pci_vendev(const void *blob, int node,
|
|
u16 *vendor, u16 *device);
|
|
|
|
/**
|
|
* Look at the pci address of a device node that represents a PCI device
|
|
* and return base address of the pci device's registers.
|
|
*
|
|
* @param dev device to examine
|
|
* @param addr pci address in the form of fdt_pci_addr
|
|
* @param bar returns base address of the pci device's registers
|
|
* @return 0 if ok, negative on error
|
|
*/
|
|
int fdtdec_get_pci_bar32(const struct udevice *dev, struct fdt_pci_addr *addr,
|
|
u32 *bar);
|
|
|
|
/**
|
|
* Look at the bus range property of a device node and return the pci bus
|
|
* range for this node.
|
|
* The property must hold one fdt_pci_addr with a length.
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param res the resource structure to return the bus range
|
|
* @return 0 if ok, negative on error
|
|
*/
|
|
|
|
int fdtdec_get_pci_bus_range(const void *blob, int node,
|
|
struct fdt_resource *res);
|
|
|
|
/**
|
|
* Look up a 32-bit integer property in a node and return it. The property
|
|
* must have at least 4 bytes of data. The value of the first cell is
|
|
* returned.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @param default_val default value to return if the property is not found
|
|
* @return integer value, if found, or default_val if not
|
|
*/
|
|
s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
|
|
s32 default_val);
|
|
|
|
/**
|
|
* Unsigned version of fdtdec_get_int. The property must have at least
|
|
* 4 bytes of data. The value of the first cell is returned.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @param default_val default value to return if the property is not found
|
|
* @return unsigned integer value, if found, or default_val if not
|
|
*/
|
|
unsigned int fdtdec_get_uint(const void *blob, int node, const char *prop_name,
|
|
unsigned int default_val);
|
|
|
|
/**
|
|
* Get a variable-sized number from a property
|
|
*
|
|
* This reads a number from one or more cells.
|
|
*
|
|
* @param ptr Pointer to property
|
|
* @param cells Number of cells containing the number
|
|
* @return the value in the cells
|
|
*/
|
|
u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells);
|
|
|
|
/**
|
|
* Look up a 64-bit integer property in a node and return it. The property
|
|
* must have at least 8 bytes of data (2 cells). The first two cells are
|
|
* concatenated to form a 8 bytes value, where the first cell is top half and
|
|
* the second cell is bottom half.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @param default_val default value to return if the property is not found
|
|
* @return integer value, if found, or default_val if not
|
|
*/
|
|
uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
|
|
uint64_t default_val);
|
|
|
|
/**
|
|
* Checks whether a node is enabled.
|
|
* This looks for a 'status' property. If this exists, then returns 1 if
|
|
* the status is 'ok' and 0 otherwise. If there is no status property,
|
|
* it returns 1 on the assumption that anything mentioned should be enabled
|
|
* by default.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @return integer value 0 (not enabled) or 1 (enabled)
|
|
*/
|
|
int fdtdec_get_is_enabled(const void *blob, int node);
|
|
|
|
/**
|
|
* Make sure we have a valid fdt available to control U-Boot.
|
|
*
|
|
* If not, a message is printed to the console if the console is ready.
|
|
*
|
|
* @return 0 if all ok, -1 if not
|
|
*/
|
|
int fdtdec_prepare_fdt(void);
|
|
|
|
/**
|
|
* Checks that we have a valid fdt available to control U-Boot.
|
|
|
|
* However, if not then for the moment nothing is done, since this function
|
|
* is called too early to panic().
|
|
*
|
|
* @returns 0
|
|
*/
|
|
int fdtdec_check_fdt(void);
|
|
|
|
/**
|
|
* Find the nodes for a peripheral and return a list of them in the correct
|
|
* order. This is used to enumerate all the peripherals of a certain type.
|
|
*
|
|
* To use this, optionally set up a /aliases node with alias properties for
|
|
* a peripheral. For example, for usb you could have:
|
|
*
|
|
* aliases {
|
|
* usb0 = "/ehci@c5008000";
|
|
* usb1 = "/ehci@c5000000";
|
|
* };
|
|
*
|
|
* Pass "usb" as the name to this function and will return a list of two
|
|
* nodes offsets: /ehci@c5008000 and ehci@c5000000.
|
|
*
|
|
* All nodes returned will match the compatible ID, as it is assumed that
|
|
* all peripherals use the same driver.
|
|
*
|
|
* If no alias node is found, then the node list will be returned in the
|
|
* order found in the fdt. If the aliases mention a node which doesn't
|
|
* exist, then this will be ignored. If nodes are found with no aliases,
|
|
* they will be added in any order.
|
|
*
|
|
* If there is a gap in the aliases, then this function return a 0 node at
|
|
* that position. The return value will also count these gaps.
|
|
*
|
|
* This function checks node properties and will not return nodes which are
|
|
* marked disabled (status = "disabled").
|
|
*
|
|
* @param blob FDT blob to use
|
|
* @param name Root name of alias to search for
|
|
* @param id Compatible ID to look for
|
|
* @param node_list Place to put list of found nodes
|
|
* @param maxcount Maximum number of nodes to find
|
|
* @return number of nodes found on success, FDT_ERR_... on error
|
|
*/
|
|
int fdtdec_find_aliases_for_id(const void *blob, const char *name,
|
|
enum fdt_compat_id id, int *node_list, int maxcount);
|
|
|
|
/*
|
|
* This function is similar to fdtdec_find_aliases_for_id() except that it
|
|
* adds to the node_list that is passed in. Any 0 elements are considered
|
|
* available for allocation - others are considered already used and are
|
|
* skipped.
|
|
*
|
|
* You can use this by calling fdtdec_find_aliases_for_id() with an
|
|
* uninitialised array, then setting the elements that are returned to -1,
|
|
* say, then calling this function, perhaps with a different compat id.
|
|
* Any elements you get back that are >0 are new nodes added by the call
|
|
* to this function.
|
|
*
|
|
* Note that if you have some nodes with aliases and some without, you are
|
|
* sailing close to the wind. The call to fdtdec_find_aliases_for_id() with
|
|
* one compat_id may fill in positions for which you have aliases defined
|
|
* for another compat_id. When you later call *this* function with the second
|
|
* compat_id, the alias positions may already be used. A debug warning may
|
|
* be generated in this case, but it is safest to define aliases for all
|
|
* nodes when you care about the ordering.
|
|
*/
|
|
int fdtdec_add_aliases_for_id(const void *blob, const char *name,
|
|
enum fdt_compat_id id, int *node_list, int maxcount);
|
|
|
|
/**
|
|
* Get the alias sequence number of a node
|
|
*
|
|
* This works out whether a node is pointed to by an alias, and if so, the
|
|
* sequence number of that alias. Aliases are of the form <base><num> where
|
|
* <num> is the sequence number. For example spi2 would be sequence number
|
|
* 2.
|
|
*
|
|
* @param blob Device tree blob (if NULL, then error is returned)
|
|
* @param base Base name for alias (before the underscore)
|
|
* @param node Node to look up
|
|
* @param seqp This is set to the sequence number if one is found,
|
|
* but otherwise the value is left alone
|
|
* @return 0 if a sequence was found, -ve if not
|
|
*/
|
|
int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
|
|
int *seqp);
|
|
|
|
/**
|
|
* Get the highest alias number for susbystem.
|
|
*
|
|
* It parses all aliases and find out highest recorded alias for subsystem.
|
|
* Aliases are of the form <base><num> where <num> is the sequence number.
|
|
*
|
|
* @param blob Device tree blob (if NULL, then error is returned)
|
|
* @param base Base name for alias susbystem (before the number)
|
|
*
|
|
* @return 0 highest alias ID, -1 if not found
|
|
*/
|
|
int fdtdec_get_alias_highest_id(const void *blob, const char *base);
|
|
|
|
/**
|
|
* Get a property from the /chosen node
|
|
*
|
|
* @param blob Device tree blob (if NULL, then NULL is returned)
|
|
* @param name Property name to look up
|
|
* @return Value of property, or NULL if it does not exist
|
|
*/
|
|
const char *fdtdec_get_chosen_prop(const void *blob, const char *name);
|
|
|
|
/**
|
|
* Get the offset of the given /chosen node
|
|
*
|
|
* This looks up a property in /chosen containing the path to another node,
|
|
* then finds the offset of that node.
|
|
*
|
|
* @param blob Device tree blob (if NULL, then error is returned)
|
|
* @param name Property name, e.g. "stdout-path"
|
|
* @return Node offset referred to by that chosen node, or -ve FDT_ERR_...
|
|
*/
|
|
int fdtdec_get_chosen_node(const void *blob, const char *name);
|
|
|
|
/*
|
|
* Get the name for a compatible ID
|
|
*
|
|
* @param id Compatible ID to look for
|
|
* @return compatible string for that id
|
|
*/
|
|
const char *fdtdec_get_compatible(enum fdt_compat_id id);
|
|
|
|
/* Look up a phandle and follow it to its node. Then return the offset
|
|
* of that node.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @return node offset if found, -ve error code on error
|
|
*/
|
|
int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);
|
|
|
|
/**
|
|
* Look up a property in a node and return its contents in an integer
|
|
* array of given length. The property must have at least enough data for
|
|
* the array (4*count bytes). It may have more, but this will be ignored.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @param array array to fill with data
|
|
* @param count number of array elements
|
|
* @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found,
|
|
* or -FDT_ERR_BADLAYOUT if not enough data
|
|
*/
|
|
int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
|
|
u32 *array, int count);
|
|
|
|
/**
|
|
* Look up a property in a node and return its contents in an integer
|
|
* array of given length. The property must exist but may have less data that
|
|
* expected (4*count bytes). It may have more, but this will be ignored.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @param array array to fill with data
|
|
* @param count number of array elements
|
|
* @return number of array elements if ok, or -FDT_ERR_NOTFOUND if the
|
|
* property is not found
|
|
*/
|
|
int fdtdec_get_int_array_count(const void *blob, int node,
|
|
const char *prop_name, u32 *array, int count);
|
|
|
|
/**
|
|
* Look up a property in a node and return a pointer to its contents as a
|
|
* unsigned int array of given length. The property must have at least enough
|
|
* data for the array ('count' cells). It may have more, but this will be
|
|
* ignored. The data is not copied.
|
|
*
|
|
* Note that you must access elements of the array with fdt32_to_cpu(),
|
|
* since the elements will be big endian even on a little endian machine.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @param count number of array elements
|
|
* @return pointer to array if found, or NULL if the property is not
|
|
* found or there is not enough data
|
|
*/
|
|
const u32 *fdtdec_locate_array(const void *blob, int node,
|
|
const char *prop_name, int count);
|
|
|
|
/**
|
|
* Look up a boolean property in a node and return it.
|
|
*
|
|
* A boolean properly is true if present in the device tree and false if not
|
|
* present, regardless of its value.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @return 1 if the properly is present; 0 if it isn't present
|
|
*/
|
|
int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
|
|
|
|
/*
|
|
* Count child nodes of one parent node.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node parent node
|
|
* @return number of child node; 0 if there is not child node
|
|
*/
|
|
int fdtdec_get_child_count(const void *blob, int node);
|
|
|
|
/**
|
|
* Look in the FDT for a config item with the given name and return its value
|
|
* as a 32-bit integer. The property must have at least 4 bytes of data. The
|
|
* value of the first cell is returned.
|
|
*
|
|
* @param blob FDT blob to use
|
|
* @param prop_name Node property name
|
|
* @param default_val default value to return if the property is not found
|
|
* @return integer value, if found, or default_val if not
|
|
*/
|
|
int fdtdec_get_config_int(const void *blob, const char *prop_name,
|
|
int default_val);
|
|
|
|
/**
|
|
* Look in the FDT for a config item with the given name
|
|
* and return whether it exists.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param prop_name property name to look up
|
|
* @return 1, if it exists, or 0 if not
|
|
*/
|
|
int fdtdec_get_config_bool(const void *blob, const char *prop_name);
|
|
|
|
/**
|
|
* Look in the FDT for a config item with the given name and return its value
|
|
* as a string.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param prop_name property name to look up
|
|
* @returns property string, NULL on error.
|
|
*/
|
|
char *fdtdec_get_config_string(const void *blob, const char *prop_name);
|
|
|
|
/*
|
|
* Look up a property in a node and return its contents in a byte
|
|
* array of given length. The property must have at least enough data for
|
|
* the array (count bytes). It may have more, but this will be ignored.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @param array array to fill with data
|
|
* @param count number of array elements
|
|
* @return 0 if ok, or -FDT_ERR_MISSING if the property is not found,
|
|
* or -FDT_ERR_BADLAYOUT if not enough data
|
|
*/
|
|
int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
|
|
u8 *array, int count);
|
|
|
|
/**
|
|
* Look up a property in a node and return a pointer to its contents as a
|
|
* byte array of given length. The property must have at least enough data
|
|
* for the array (count bytes). It may have more, but this will be ignored.
|
|
* The data is not copied.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @param count number of array elements
|
|
* @return pointer to byte array if found, or NULL if the property is not
|
|
* found or there is not enough data
|
|
*/
|
|
const u8 *fdtdec_locate_byte_array(const void *blob, int node,
|
|
const char *prop_name, int count);
|
|
|
|
/**
|
|
* Obtain an indexed resource from a device property.
|
|
*
|
|
* @param fdt FDT blob
|
|
* @param node node to examine
|
|
* @param property name of the property to parse
|
|
* @param index index of the resource to retrieve
|
|
* @param res returns the resource
|
|
* @return 0 if ok, negative on error
|
|
*/
|
|
int fdt_get_resource(const void *fdt, int node, const char *property,
|
|
unsigned int index, struct fdt_resource *res);
|
|
|
|
/**
|
|
* Obtain a named resource from a device property.
|
|
*
|
|
* Look up the index of the name in a list of strings and return the resource
|
|
* at that index.
|
|
*
|
|
* @param fdt FDT blob
|
|
* @param node node to examine
|
|
* @param property name of the property to parse
|
|
* @param prop_names name of the property containing the list of names
|
|
* @param name the name of the entry to look up
|
|
* @param res returns the resource
|
|
*/
|
|
int fdt_get_named_resource(const void *fdt, int node, const char *property,
|
|
const char *prop_names, const char *name,
|
|
struct fdt_resource *res);
|
|
|
|
/* Display timings from linux include/video/display_timing.h */
|
|
enum display_flags {
|
|
DISPLAY_FLAGS_HSYNC_LOW = 1 << 0,
|
|
DISPLAY_FLAGS_HSYNC_HIGH = 1 << 1,
|
|
DISPLAY_FLAGS_VSYNC_LOW = 1 << 2,
|
|
DISPLAY_FLAGS_VSYNC_HIGH = 1 << 3,
|
|
|
|
/* data enable flag */
|
|
DISPLAY_FLAGS_DE_LOW = 1 << 4,
|
|
DISPLAY_FLAGS_DE_HIGH = 1 << 5,
|
|
/* drive data on pos. edge */
|
|
DISPLAY_FLAGS_PIXDATA_POSEDGE = 1 << 6,
|
|
/* drive data on neg. edge */
|
|
DISPLAY_FLAGS_PIXDATA_NEGEDGE = 1 << 7,
|
|
DISPLAY_FLAGS_INTERLACED = 1 << 8,
|
|
DISPLAY_FLAGS_DOUBLESCAN = 1 << 9,
|
|
DISPLAY_FLAGS_DOUBLECLK = 1 << 10,
|
|
};
|
|
|
|
/*
|
|
* A single signal can be specified via a range of minimal and maximal values
|
|
* with a typical value, that lies somewhere inbetween.
|
|
*/
|
|
struct timing_entry {
|
|
u32 min;
|
|
u32 typ;
|
|
u32 max;
|
|
};
|
|
|
|
/*
|
|
* Single "mode" entry. This describes one set of signal timings a display can
|
|
* have in one setting. This struct can later be converted to struct videomode
|
|
* (see include/video/videomode.h). As each timing_entry can be defined as a
|
|
* range, one struct display_timing may become multiple struct videomodes.
|
|
*
|
|
* Example: hsync active high, vsync active low
|
|
*
|
|
* Active Video
|
|
* Video ______________________XXXXXXXXXXXXXXXXXXXXXX_____________________
|
|
* |<- sync ->|<- back ->|<----- active ----->|<- front ->|<- sync..
|
|
* | | porch | | porch |
|
|
*
|
|
* HSync _|¯¯¯¯¯¯¯¯¯¯|___________________________________________|¯¯¯¯¯¯¯¯¯
|
|
*
|
|
* VSync ¯|__________|¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|_________
|
|
*/
|
|
struct display_timing {
|
|
struct timing_entry pixelclock;
|
|
|
|
struct timing_entry hactive; /* hor. active video */
|
|
struct timing_entry hfront_porch; /* hor. front porch */
|
|
struct timing_entry hback_porch; /* hor. back porch */
|
|
struct timing_entry hsync_len; /* hor. sync len */
|
|
|
|
struct timing_entry vactive; /* ver. active video */
|
|
struct timing_entry vfront_porch; /* ver. front porch */
|
|
struct timing_entry vback_porch; /* ver. back porch */
|
|
struct timing_entry vsync_len; /* ver. sync len */
|
|
|
|
enum display_flags flags; /* display flags */
|
|
bool hdmi_monitor; /* is hdmi monitor? */
|
|
};
|
|
|
|
/**
|
|
* fdtdec_decode_display_timing() - decode display timings
|
|
*
|
|
* Decode display timings from the supplied 'display-timings' node.
|
|
* See doc/device-tree-bindings/video/display-timing.txt for binding
|
|
* information.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node 'display-timing' node containing the timing subnodes
|
|
* @param index Index number to read (0=first timing subnode)
|
|
* @param config Place to put timings
|
|
* @return 0 if OK, -FDT_ERR_NOTFOUND if not found
|
|
*/
|
|
int fdtdec_decode_display_timing(const void *blob, int node, int index,
|
|
struct display_timing *config);
|
|
|
|
/**
|
|
* fdtdec_setup_mem_size_base() - decode and setup gd->ram_size and
|
|
* gd->ram_start
|
|
*
|
|
* Decode the /memory 'reg' property to determine the size and start of the
|
|
* first memory bank, populate the global data with the size and start of the
|
|
* first bank of memory.
|
|
*
|
|
* This function should be called from a boards dram_init(). This helper
|
|
* function allows for boards to query the device tree for DRAM size and start
|
|
* address instead of hard coding the value in the case where the memory size
|
|
* and start address cannot be detected automatically.
|
|
*
|
|
* @return 0 if OK, -EINVAL if the /memory node or reg property is missing or
|
|
* invalid
|
|
*/
|
|
int fdtdec_setup_mem_size_base(void);
|
|
|
|
/**
|
|
* fdtdec_setup_mem_size_base_lowest() - decode and setup gd->ram_size and
|
|
* gd->ram_start by lowest available memory base
|
|
*
|
|
* Decode the /memory 'reg' property to determine the lowest start of the memory
|
|
* bank bank and populate the global data with it.
|
|
*
|
|
* This function should be called from a boards dram_init(). This helper
|
|
* function allows for boards to query the device tree for DRAM size and start
|
|
* address instead of hard coding the value in the case where the memory size
|
|
* and start address cannot be detected automatically.
|
|
*
|
|
* @return 0 if OK, -EINVAL if the /memory node or reg property is missing or
|
|
* invalid
|
|
*/
|
|
int fdtdec_setup_mem_size_base_lowest(void);
|
|
|
|
/**
|
|
* fdtdec_setup_memory_banksize() - decode and populate gd->bd->bi_dram
|
|
*
|
|
* Decode the /memory 'reg' property to determine the address and size of the
|
|
* memory banks. Use this data to populate the global data board info with the
|
|
* phys address and size of memory banks.
|
|
*
|
|
* This function should be called from a boards dram_init_banksize(). This
|
|
* helper function allows for boards to query the device tree for memory bank
|
|
* information instead of hard coding the information in cases where it cannot
|
|
* be detected automatically.
|
|
*
|
|
* @return 0 if OK, -EINVAL if the /memory node or reg property is missing or
|
|
* invalid
|
|
*/
|
|
int fdtdec_setup_memory_banksize(void);
|
|
|
|
/**
|
|
* fdtdec_set_ethernet_mac_address() - set MAC address for default interface
|
|
*
|
|
* Looks up the default interface via the "ethernet" alias (in the /aliases
|
|
* node) and stores the given MAC in its "local-mac-address" property. This
|
|
* is useful on platforms that store the MAC address in a custom location.
|
|
* Board code can call this in the late init stage to make sure that the
|
|
* interface device tree node has the right MAC address configured for the
|
|
* Ethernet uclass to pick it up.
|
|
*
|
|
* Typically the FDT passed into this function will be U-Boot's control DTB.
|
|
* Given that a lot of code may be holding offsets to various nodes in that
|
|
* tree, this code will only set the "local-mac-address" property in-place,
|
|
* which means that it needs to exist and have space for the 6-byte address.
|
|
* This ensures that the operation is non-destructive and does not invalidate
|
|
* offsets that other drivers may be using.
|
|
*
|
|
* @param fdt FDT blob
|
|
* @param mac buffer containing the MAC address to set
|
|
* @param size size of MAC address
|
|
* @return 0 on success or a negative error code on failure
|
|
*/
|
|
int fdtdec_set_ethernet_mac_address(void *fdt, const u8 *mac, size_t size);
|
|
|
|
/**
|
|
* fdtdec_set_phandle() - sets the phandle of a given node
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node offset in the FDT blob of the node whose phandle is to
|
|
* be set
|
|
* @param phandle phandle to set for the given node
|
|
* @return 0 on success or a negative error code on failure
|
|
*/
|
|
static inline int fdtdec_set_phandle(void *blob, int node, uint32_t phandle)
|
|
{
|
|
return fdt_setprop_u32(blob, node, "phandle", phandle);
|
|
}
|
|
|
|
/**
|
|
* fdtdec_add_reserved_memory() - add or find a reserved-memory node
|
|
*
|
|
* If a reserved-memory node already exists for the given carveout, a phandle
|
|
* for that node will be returned. Otherwise a new node will be created and a
|
|
* phandle corresponding to it will be returned.
|
|
*
|
|
* See Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
|
|
* for details on how to use reserved memory regions.
|
|
*
|
|
* As an example, consider the following code snippet:
|
|
*
|
|
* struct fdt_memory fb = {
|
|
* .start = 0x92cb3000,
|
|
* .end = 0x934b2fff,
|
|
* };
|
|
* uint32_t phandle;
|
|
*
|
|
* fdtdec_add_reserved_memory(fdt, "framebuffer", &fb, &phandle, false);
|
|
*
|
|
* This results in the following subnode being added to the top-level
|
|
* /reserved-memory node:
|
|
*
|
|
* reserved-memory {
|
|
* #address-cells = <0x00000002>;
|
|
* #size-cells = <0x00000002>;
|
|
* ranges;
|
|
*
|
|
* framebuffer@92cb3000 {
|
|
* reg = <0x00000000 0x92cb3000 0x00000000 0x00800000>;
|
|
* phandle = <0x0000004d>;
|
|
* };
|
|
* };
|
|
*
|
|
* If the top-level /reserved-memory node does not exist, it will be created.
|
|
* The phandle returned from the function call can be used to reference this
|
|
* reserved memory region from other nodes.
|
|
*
|
|
* See fdtdec_set_carveout() for a more elaborate example.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param basename base name of the node to create
|
|
* @param carveout information about the carveout region
|
|
* @param phandlep return location for the phandle of the carveout region
|
|
* can be NULL if no phandle should be added
|
|
* @param no_map add "no-map" property if true
|
|
* @return 0 on success or a negative error code on failure
|
|
*/
|
|
int fdtdec_add_reserved_memory(void *blob, const char *basename,
|
|
const struct fdt_memory *carveout,
|
|
uint32_t *phandlep, bool no_map);
|
|
|
|
/**
|
|
* fdtdec_get_carveout() - reads a carveout from an FDT
|
|
*
|
|
* Reads information about a carveout region from an FDT. The carveout is a
|
|
* referenced by its phandle that is read from a given property in a given
|
|
* node.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node name of a node
|
|
* @param name name of the property in the given node that contains
|
|
* the phandle for the carveout
|
|
* @param index index of the phandle for which to read the carveout
|
|
* @param carveout return location for the carveout information
|
|
* @return 0 on success or a negative error code on failure
|
|
*/
|
|
int fdtdec_get_carveout(const void *blob, const char *node, const char *name,
|
|
unsigned int index, struct fdt_memory *carveout);
|
|
|
|
/**
|
|
* fdtdec_set_carveout() - sets a carveout region for a given node
|
|
*
|
|
* Sets a carveout region for a given node. If a reserved-memory node already
|
|
* exists for the carveout, the phandle for that node will be reused. If no
|
|
* such node exists, a new one will be created and a phandle to it stored in
|
|
* a specified property of the given node.
|
|
*
|
|
* As an example, consider the following code snippet:
|
|
*
|
|
* const char *node = "/host1x@50000000/dc@54240000";
|
|
* struct fdt_memory fb = {
|
|
* .start = 0x92cb3000,
|
|
* .end = 0x934b2fff,
|
|
* };
|
|
*
|
|
* fdtdec_set_carveout(fdt, node, "memory-region", 0, "framebuffer", &fb);
|
|
*
|
|
* dc@54200000 is a display controller and was set up by the bootloader to
|
|
* scan out the framebuffer specified by "fb". This would cause the following
|
|
* reserved memory region to be added:
|
|
*
|
|
* reserved-memory {
|
|
* #address-cells = <0x00000002>;
|
|
* #size-cells = <0x00000002>;
|
|
* ranges;
|
|
*
|
|
* framebuffer@92cb3000 {
|
|
* reg = <0x00000000 0x92cb3000 0x00000000 0x00800000>;
|
|
* phandle = <0x0000004d>;
|
|
* };
|
|
* };
|
|
*
|
|
* A "memory-region" property will also be added to the node referenced by the
|
|
* offset parameter.
|
|
*
|
|
* host1x@50000000 {
|
|
* ...
|
|
*
|
|
* dc@54240000 {
|
|
* ...
|
|
* memory-region = <0x0000004d>;
|
|
* ...
|
|
* };
|
|
*
|
|
* ...
|
|
* };
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node name of the node to add the carveout to
|
|
* @param prop_name name of the property in which to store the phandle of
|
|
* the carveout
|
|
* @param index index of the phandle to store
|
|
* @param name base name of the reserved-memory node to create
|
|
* @param carveout information about the carveout to add
|
|
* @return 0 on success or a negative error code on failure
|
|
*/
|
|
int fdtdec_set_carveout(void *blob, const char *node, const char *prop_name,
|
|
unsigned int index, const char *name,
|
|
const struct fdt_memory *carveout);
|
|
|
|
/**
|
|
* Set up the device tree ready for use
|
|
*/
|
|
int fdtdec_setup(void);
|
|
|
|
/**
|
|
* Perform board-specific early DT adjustments
|
|
*/
|
|
int fdtdec_board_setup(const void *fdt_blob);
|
|
|
|
#if CONFIG_IS_ENABLED(MULTI_DTB_FIT)
|
|
/**
|
|
* fdtdec_resetup() - Set up the device tree again
|
|
*
|
|
* The main difference with fdtdec_setup() is that it returns if the fdt has
|
|
* changed because a better match has been found.
|
|
* This is typically used for boards that rely on a DM driver to detect the
|
|
* board type. This function sould be called by the board code after the stuff
|
|
* needed by board_fit_config_name_match() to operate porperly is available.
|
|
* If this functions signals that a rescan is necessary, the board code must
|
|
* unbind all the drivers using dm_uninit() and then rescan the DT with
|
|
* dm_init_and_scan().
|
|
*
|
|
* @param rescan Returns a flag indicating that fdt has changed and rescanning
|
|
* the fdt is required
|
|
*
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int fdtdec_resetup(int *rescan);
|
|
#endif
|
|
|
|
/**
|
|
* Board-specific FDT initialization. Returns the address to a device tree blob.
|
|
* Called when CONFIG_OF_BOARD is defined, or if CONFIG_OF_SEPARATE is defined
|
|
* and the board implements it.
|
|
*/
|
|
void *board_fdt_blob_setup(void);
|
|
|
|
/*
|
|
* Decode the size of memory
|
|
*
|
|
* RAM size is normally set in a /memory node and consists of a list of
|
|
* (base, size) cells in the 'reg' property. This information is used to
|
|
* determine the total available memory as well as the address and size
|
|
* of each bank.
|
|
*
|
|
* Optionally the memory configuration can vary depending on a board id,
|
|
* typically read from strapping resistors or an EEPROM on the board.
|
|
*
|
|
* Finally, memory size can be detected (within certain limits) by probing
|
|
* the available memory. It is safe to do so within the limits provides by
|
|
* the board's device tree information. This makes it possible to produce
|
|
* boards with different memory sizes, where the device tree specifies the
|
|
* maximum memory configuration, and the smaller memory configuration is
|
|
* probed.
|
|
*
|
|
* This function decodes that information, returning the memory base address,
|
|
* size and bank information. See the memory.txt binding for full
|
|
* documentation.
|
|
*
|
|
* @param blob Device tree blob
|
|
* @param area Name of node to check (NULL means "/memory")
|
|
* @param board_id Board ID to look up
|
|
* @param basep Returns base address of first memory bank (NULL to
|
|
* ignore)
|
|
* @param sizep Returns total memory size (NULL to ignore)
|
|
* @param bd Updated with the memory bank information (NULL to skip)
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int fdtdec_decode_ram_size(const void *blob, const char *area, int board_id,
|
|
phys_addr_t *basep, phys_size_t *sizep,
|
|
struct bd_info *bd);
|
|
|
|
#endif
|