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106 lines
3.1 KiB
106 lines
3.1 KiB
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef __SYSCON_H
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#define __SYSCON_H
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#include <dm/ofnode.h>
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#include <fdtdec.h>
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/**
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* struct syscon_uc_info - Information stored by the syscon UCLASS_UCLASS
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*
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* @regmap: Register map for this controller
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*/
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struct syscon_uc_info {
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struct regmap *regmap;
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};
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/* So far there are no ops so this is a placeholder */
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struct syscon_ops {
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};
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#define syscon_get_ops(dev) ((struct syscon_ops *)(dev)->driver->ops)
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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/*
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* We don't support 64-bit machines. If they are so resource-contrained that
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* they need to use OF_PLATDATA, something is horribly wrong with the
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* education of our hardware engineers.
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*
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* Update: 64-bit is now supported and we have an education crisis.
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*/
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struct syscon_base_plat {
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fdt_val_t reg[2];
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};
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#endif
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/**
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* syscon_get_regmap() - Get access to a register map
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*
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* @dev: Device to check (UCLASS_SCON)
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* @info: Returns regmap for the device
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* Return: 0 if OK, -ve on error
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*/
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struct regmap *syscon_get_regmap(struct udevice *dev);
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/**
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* syscon_get_regmap_by_driver_data() - Look up a controller by its ID
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*
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* Each system controller can be accessed by its driver data, which is
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* assumed to be unique through the scope of all system controllers that
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* are in use. This function looks up the controller given this driver data.
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*
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* @driver_data: Driver data value to look up
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* @devp: Returns the controller correponding to @driver_data
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* Return: 0 on success, -ENODEV if the ID was not found, or other -ve error
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* code
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*/
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int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp);
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/**
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* syscon_get_regmap_by_driver_data() - Look up a controller by its ID
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*
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* Each system controller can be accessed by its driver data, which is
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* assumed to be unique through the scope of all system controllers that
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* are in use. This function looks up the regmap given this driver data.
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*
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* @driver_data: Driver data value to look up
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* Return: register map correponding to @driver_data, or -ve error code
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*/
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struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data);
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/**
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* syscon_regmap_lookup_by_phandle() - Look up a controller by a phandle
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*
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* This operates by looking up the given name in the device (device
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* tree property) of the device using the system controller.
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*
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* @dev: Device using the system controller
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* @name: Name of property referring to the system controller
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* Return: A pointer to the regmap if found, ERR_PTR(-ve) on error
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*/
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struct regmap *syscon_regmap_lookup_by_phandle(struct udevice *dev,
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const char *name);
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/**
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* syscon_get_first_range() - get the first memory range from a syscon regmap
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*
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* @driver_data: Driver data value to look up
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* Return: first region of register map correponding to @driver_data, or
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* -ve error code
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*/
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void *syscon_get_first_range(ulong driver_data);
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/**
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* syscon_node_to_regmap - get regmap from syscon
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*
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* @node: Device node of syscon
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*/
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struct regmap *syscon_node_to_regmap(ofnode node);
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#endif
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