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![Simon Glass](/assets/img/avatar_default.png)
This simple function returns the node offset of a named alias. Signed-off-by: Simon Glass <sjg@chromium.org>
587 lines
21 KiB
C
587 lines
21 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors.
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* SPDX-License-Identifier: GPL-2.0+
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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 <libfdt.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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#ifdef CONFIG_PHYS_64BIT
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typedef u64 fdt_addr_t;
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typedef u64 fdt_size_t;
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#define FDT_ADDR_T_NONE (-1ULL)
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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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#else
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typedef u32 fdt_addr_t;
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typedef u32 fdt_size_t;
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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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#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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/**
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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_USB, /* Tegra20 USB port */
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COMPAT_NVIDIA_TEGRA30_USB, /* Tegra30 USB port */
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COMPAT_NVIDIA_TEGRA114_USB, /* Tegra114 USB port */
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COMPAT_NVIDIA_TEGRA114_I2C, /* Tegra114 I2C w/single clock source */
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COMPAT_NVIDIA_TEGRA20_I2C, /* Tegra20 i2c */
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COMPAT_NVIDIA_TEGRA20_DVC, /* Tegra20 dvc (really just i2c) */
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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_KBC, /* Tegra20 Keyboard */
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COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */
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COMPAT_NVIDIA_TEGRA20_PWM, /* Tegra 2 PWM controller */
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COMPAT_NVIDIA_TEGRA20_DC, /* Tegra 2 Display controller */
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COMPAT_NVIDIA_TEGRA124_SDMMC, /* Tegra124 SDMMC controller */
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COMPAT_NVIDIA_TEGRA30_SDMMC, /* Tegra30 SDMMC controller */
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COMPAT_NVIDIA_TEGRA20_SDMMC, /* Tegra20 SDMMC controller */
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COMPAT_NVIDIA_TEGRA20_SFLASH, /* Tegra 2 SPI flash controller */
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COMPAT_NVIDIA_TEGRA20_SLINK, /* Tegra 2 SPI SLINK controller */
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COMPAT_NVIDIA_TEGRA114_SPI, /* Tegra 114 SPI 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_S3C2440_I2C, /* Exynos I2C Controller */
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COMPAT_SAMSUNG_EXYNOS5_SOUND, /* Exynos Sound */
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COMPAT_WOLFSON_WM8994_CODEC, /* Wolfson WM8994 Sound Codec */
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COMPAT_SAMSUNG_EXYNOS_SPI, /* Exynos SPI */
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COMPAT_GOOGLE_CROS_EC, /* Google CROS_EC Protocol */
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COMPAT_GOOGLE_CROS_EC_KEYB, /* Google CROS_EC Keyboard */
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COMPAT_SAMSUNG_EXYNOS_EHCI, /* Exynos EHCI controller */
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COMPAT_SAMSUNG_EXYNOS5_XHCI, /* Exynos5 XHCI controller */
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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_FIMD, /* Exynos Display controller */
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COMPAT_SAMSUNG_EXYNOS_MIPI_DSI, /* Exynos mipi dsi */
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COMPAT_SAMSUNG_EXYNOS5_DP, /* Exynos Display port controller */
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COMPAT_SAMSUNG_EXYNOS_DWMMC, /* Exynos DWMMC controller */
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COMPAT_SAMSUNG_EXYNOS_MMC, /* Exynos MMC controller */
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COMPAT_SAMSUNG_EXYNOS_SERIAL, /* Exynos UART */
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COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */
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COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */
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COMPAT_MAXIM_98095_CODEC, /* MAX98095 Codec */
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COMPAT_INFINEON_SLB9635_TPM, /* Infineon SLB9635 TPM */
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COMPAT_INFINEON_SLB9645_TPM, /* Infineon SLB9645 TPM */
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COMPAT_SAMSUNG_EXYNOS5_I2C, /* Exynos5 High Speed I2C Controller */
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COMPAT_SANDBOX_HOST_EMULATION, /* Sandbox emulation of a function */
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COMPAT_SANDBOX_LCD_SDL, /* Sandbox LCD emulation with SDL */
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COMPAT_TI_TPS65090, /* Texas Instrument TPS65090 */
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COMPAT_NXP_PTN3460, /* NXP PTN3460 DP/LVDS bridge */
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COMPAT_COUNT,
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};
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/* GPIOs are numbered from 0 */
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enum {
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FDT_GPIO_NONE = -1U, /* an invalid GPIO used to end our list */
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FDT_GPIO_ACTIVE_LOW = 1 << 0, /* input is active low (else high) */
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};
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/* This is the state of a GPIO pin as defined by the fdt */
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struct fdt_gpio_state {
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const char *name; /* name of the fdt property defining this */
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uint gpio; /* GPIO number, or FDT_GPIO_NONE if none */
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u8 flags; /* FDT_GPIO_... flags */
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};
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/* This tells us whether a fdt_gpio_state record is valid or not */
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#define fdt_gpio_isvalid(x) ((x)->gpio != FDT_GPIO_NONE)
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/**
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* Read the GPIO taking into account the polarity of the pin.
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*
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* @param gpio pointer to the decoded gpio
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* @return value of the gpio if successful, < 0 if unsuccessful
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*/
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int fdtdec_get_gpio(struct fdt_gpio_state *gpio);
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/**
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* Write the GPIO taking into account the polarity of the pin.
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*
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* @param gpio pointer to the decoded gpio
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* @return 0 if successful
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*/
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int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val);
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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 it as an address.
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* The property must hold either one address with no trailing data or
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* one address with a length. This is only tested on 32-bit machines.
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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 it as an address.
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* The property must hold one address with a length. This is only tested
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* on 32-bit machines.
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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_size(const void *blob, int node,
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const char *prop_name, fdt_size_t *sizep);
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/**
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* Look up a 32-bit integer property in a node and return it. The property
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* must have at least 4 bytes of data. The value of the first cell is
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* returned.
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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 default_val default value to return if the property is not found
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* @return integer value, if found, or default_val if not
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*/
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s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
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s32 default_val);
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/**
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* Look up a 64-bit integer property in a node and return it. The property
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* must have at least 8 bytes of data (2 cells). The first two cells are
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* concatenated to form a 8 bytes value, where the first cell is top half and
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* the second cell is bottom half.
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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 default_val default value to return if the property is not found
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* @return integer value, if found, or default_val if not
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*/
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uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
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uint64_t default_val);
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/**
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* Checks whether a node is enabled.
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* This looks for a 'status' property. If this exists, then returns 1 if
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* the status is 'ok' and 0 otherwise. If there is no status property,
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* it returns 1 on the assumption that anything mentioned should be enabled
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* by default.
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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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* @return integer value 0 (not enabled) or 1 (enabled)
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*/
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int fdtdec_get_is_enabled(const void *blob, int node);
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/**
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* Make sure we have a valid fdt available to control U-Boot.
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*
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* If not, a message is printed to the console if the console is ready.
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*
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* @return 0 if all ok, -1 if not
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*/
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int fdtdec_prepare_fdt(void);
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/**
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* Checks that we have a valid fdt available to control U-Boot.
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* However, if not then for the moment nothing is done, since this function
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* is called too early to panic().
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*
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* @returns 0
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*/
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int fdtdec_check_fdt(void);
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/**
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* Find the nodes for a peripheral and return a list of them in the correct
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* order. This is used to enumerate all the peripherals of a certain type.
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*
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* To use this, optionally set up a /aliases node with alias properties for
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* a peripheral. For example, for usb you could have:
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*
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* aliases {
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* usb0 = "/ehci@c5008000";
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* usb1 = "/ehci@c5000000";
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* };
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*
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* Pass "usb" as the name to this function and will return a list of two
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* nodes offsets: /ehci@c5008000 and ehci@c5000000.
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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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* If no alias node is found, then the node list will be returned in the
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* order found in the fdt. If the aliases mention a node which doesn't
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* exist, then this will be ignored. If nodes are found with no aliases,
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* they will be added in any order.
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*
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* If there is a gap in the aliases, then this function return a 0 node at
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* that position. The return value will also count these gaps.
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*
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* This function checks node properties and will not return nodes which are
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* marked disabled (status = "disabled").
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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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* @param node_list Place to put list of found nodes
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* @param maxcount Maximum number of nodes to find
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* @return number of nodes found on success, FTD_ERR_... on error
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*/
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int fdtdec_find_aliases_for_id(const void *blob, const char *name,
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enum fdt_compat_id id, int *node_list, int maxcount);
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/*
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* This function is similar to fdtdec_find_aliases_for_id() except that it
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* adds to the node_list that is passed in. Any 0 elements are considered
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* available for allocation - others are considered already used and are
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* skipped.
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*
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* You can use this by calling fdtdec_find_aliases_for_id() with an
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* uninitialised array, then setting the elements that are returned to -1,
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* say, then calling this function, perhaps with a different compat id.
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* Any elements you get back that are >0 are new nodes added by the call
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* to this function.
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*
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* Note that if you have some nodes with aliases and some without, you are
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* sailing close to the wind. The call to fdtdec_find_aliases_for_id() with
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* one compat_id may fill in positions for which you have aliases defined
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* for another compat_id. When you later call *this* function with the second
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* compat_id, the alias positions may already be used. A debug warning may
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* be generated in this case, but it is safest to define aliases for all
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* nodes when you care about the ordering.
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*/
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int fdtdec_add_aliases_for_id(const void *blob, const char *name,
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enum fdt_compat_id id, int *node_list, int maxcount);
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/**
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* Get the alias sequence number of a node
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*
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* This works out whether a node is pointed to by an alias, and if so, the
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* sequence number of that alias. Aliases are of the form <base><num> where
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* <num> is the sequence number. For example spi2 would be sequence number
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* 2.
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*
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* @param blob Device tree blob (if NULL, then error is returned)
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* @param base Base name for alias (before the underscore)
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* @param node Node to look up
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* @param seqp This is set to the sequence number if one is found,
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* but otherwise the value is left alone
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* @return 0 if a sequence was found, -ve if not
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*/
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int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
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int *seqp);
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/**
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* Get the offset of the given alias node
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*
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* This looks up an alias in /aliases then finds the offset of that node.
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*
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* @param blob Device tree blob (if NULL, then error is returned)
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* @param name Alias name, e.g. "console"
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* @return Node offset referred to by that alias, or -ve FDT_ERR_...
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*/
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int fdtdec_get_alias_node(const void *blob, const char *name);
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/*
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* Get the name for a compatible ID
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*
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* @param id Compatible ID to look for
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* @return compatible string for that id
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*/
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const char *fdtdec_get_compatible(enum fdt_compat_id id);
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/* Look up a phandle and follow it to its node. Then return the offset
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* of that 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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* @return node offset if found, -ve error code on error
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*/
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int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);
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/**
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* Look up a property in a node and return its contents in an integer
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* array of given length. The property must have at least enough data for
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* the array (4*count bytes). It may have more, but this will be ignored.
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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 array array to fill with data
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* @param count number of array elements
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* @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found,
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* or -FDT_ERR_BADLAYOUT if not enough data
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*/
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int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
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u32 *array, int count);
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/**
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* Look up a property in a node and return a pointer to its contents as a
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* unsigned int array of given length. The property must have at least enough
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* data for the array ('count' cells). It may have more, but this will be
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* ignored. The data is not copied.
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*
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* Note that you must access elements of the array with fdt32_to_cpu(),
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* since the elements will be big endian even on a little endian machine.
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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 count number of array elements
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* @return pointer to array if found, or NULL if the property is not
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* found or there is not enough data
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*/
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const u32 *fdtdec_locate_array(const void *blob, int node,
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const char *prop_name, int count);
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/**
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* Look up a boolean property in a node and return it.
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*
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* A boolean properly is true if present in the device tree and false if not
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* present, regardless of its value.
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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 1 if the properly is present; 0 if it isn't present
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*/
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int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
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/**
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* Decode a single GPIOs from an FDT.
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*
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* If the property is not found, then the GPIO structure will still be
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* initialised, with gpio set to FDT_GPIO_NONE. This makes it easy to
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* provide optional GPIOs.
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*
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* @param blob FDT blob to use
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* @param node Node to look at
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* @param prop_name Node property name
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* @param gpio gpio elements to fill from FDT
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* @return 0 if ok, -FDT_ERR_NOTFOUND if the property is missing.
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*/
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int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
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struct fdt_gpio_state *gpio);
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/**
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* Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
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* terminating item.
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*
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* @param blob FDT blob to use
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* @param node Node to look at
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* @param prop_name Node property name
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* @param gpio Array of gpio elements to fill from FDT. This will be
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* untouched if either 0 or an error is returned
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* @param max_count Maximum number of elements allowed
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* @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
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* be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
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*/
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int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
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struct fdt_gpio_state *gpio, int max_count);
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/**
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* Set up a GPIO pin according to the provided gpio information. At present this
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* just requests the GPIO.
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*
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* If the gpio is FDT_GPIO_NONE, no action is taken. This makes it easy to
|
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* deal with optional GPIOs.
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*
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* @param gpio GPIO info to use for set up
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* @return 0 if all ok or gpio was FDT_GPIO_NONE; -1 on error
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*/
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int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
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/**
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* Look in the FDT for a config item with the given name and return its value
|
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* as a 32-bit integer. The property must have at least 4 bytes of data. The
|
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* value of the first cell is returned.
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*
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* @param blob FDT blob to use
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* @param prop_name Node property name
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* @param default_val default value to return if the property is not found
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* @return integer value, if found, or default_val if not
|
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*/
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int fdtdec_get_config_int(const void *blob, const char *prop_name,
|
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int default_val);
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/**
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* Look in the FDT for a config item with the given name
|
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* and return whether it exists.
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*
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* @param blob FDT blob
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* @param prop_name property name to look up
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* @return 1, if it exists, or 0 if not
|
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*/
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int fdtdec_get_config_bool(const void *blob, const char *prop_name);
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/**
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* Look in the FDT for a config item with the given name and return its value
|
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* as a string.
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*
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* @param blob FDT blob
|
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* @param prop_name property name to look up
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* @returns property string, NULL on error.
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*/
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char *fdtdec_get_config_string(const void *blob, const char *prop_name);
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|
|
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/*
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* 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
|
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* the array (count bytes). It may have more, but this will be ignored.
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|
*
|
|
* @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
|
|
*/
|
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int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
|
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u8 *array, int count);
|
|
|
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/**
|
|
* 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);
|
|
|
|
/**
|
|
* Look up a property in a node which contains a memory region address and
|
|
* size. Then return a pointer to this address.
|
|
*
|
|
* The property must hold one address with a length. This is only tested on
|
|
* 32-bit machines.
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node node to examine
|
|
* @param prop_name name of property to find
|
|
* @param ptrp returns pointer to region, or NULL if no address
|
|
* @param size returns size of region
|
|
* @return 0 if ok, -1 on error (propery not found)
|
|
*/
|
|
int fdtdec_decode_region(const void *blob, int node,
|
|
const char *prop_name, void **ptrp, size_t *size);
|
|
|
|
/* A flash map entry, containing an offset and length */
|
|
struct fmap_entry {
|
|
uint32_t offset;
|
|
uint32_t length;
|
|
};
|
|
|
|
/**
|
|
* Read a flash entry from the fdt
|
|
*
|
|
* @param blob FDT blob
|
|
* @param node Offset of node to read
|
|
* @param name Name of node being read
|
|
* @param entry Place to put offset and size of this node
|
|
* @return 0 if ok, -ve on error
|
|
*/
|
|
int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
|
|
struct fmap_entry *entry);
|
|
#endif
|