178 lines
6.0 KiB
C
178 lines
6.0 KiB
C
/*
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* Copyright (c) 2020 Nordic Semiconductor ASA
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file Common soc.h include for Nordic nRF5 SoCs.
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*/
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#ifndef _ZEPHYR_SOC_ARM_NORDIC_NRF_SOC_NRF_COMMON_H_
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#define _ZEPHYR_SOC_ARM_NORDIC_NRF_SOC_NRF_COMMON_H_
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#ifndef _ASMLANGUAGE
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#include <nrfx.h>
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#include <devicetree.h>
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#include <toolchain.h>
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/**
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* @brief Get a PSEL value out of a foo-gpios or foo-pin devicetree property
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*
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* Many Nordic bindings have 'foo-pin' properties to specify a pin
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* configuration as a PSEL value directly instead of using a 'foo-gpios'
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* <&gpioX Y flags> style controller phandle + GPIO specifier.
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*
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* It would be better to use 'foo-gpios' properties instead. This type
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* of property is more in line with the recommended DT encoding for GPIOs.
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*
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* To allow for a smooth migration from 'foo-pin' to 'foo-gpios', this
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* helper macro can be used to get a PSEL value out of the devicetree
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* using whichever one of 'foo-gpios' or 'foo-pin' is in the DTS.
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*
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* Note that you can also use:
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*
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* - NRF_DT_PSEL_CHECK_*() to check the property configuration at build time
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* - NRF_DT_GPIOS_TO_PSEL() if you only have a 'foo-gpios'
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*
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* @param node_id node identifier
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* @param psel_prop lowercase-and-underscores old-style 'foo-pin' property
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* @param gpios_prop new-style 'foo-gpios' property
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* @param default_val the value returned if neither is set
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* @return PSEL register value taken from psel_prop or gpios_prop, whichever
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* is present in the DTS. If gpios_prop is present, it is converted
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* to a PSEL register value first.
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*/
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#define NRF_DT_PSEL(node_id, psel_prop, gpios_prop, default_val) \
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COND_CODE_1(DT_NODE_HAS_PROP(node_id, psel_prop), \
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(DT_PROP(node_id, psel_prop)), \
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(COND_CODE_1( \
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DT_NODE_HAS_PROP(node_id, gpios_prop), \
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(NRF_DT_GPIOS_TO_PSEL(node_id, \
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gpios_prop)), \
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(default_val))))
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/**
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* Error out the build if the devicetree node with identifier
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* 'node_id' has both a legacy psel-style property and a gpios
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* property.
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*
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* Otherwise, do nothing.
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*
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* @param node_id node identifier
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* @param psel_prop lowercase-and-underscores PSEL style property
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* @param psel_prop_name human-readable string name of psel_prop
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* @param gpios_prop lowercase-and-underscores foo-gpios style property
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* @param gpio_prop_name human-readable string name of gpios_prop
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*/
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#define NRF_DT_PSEL_CHECK_NOT_BOTH(node_id, psel_prop, psel_prop_name, \
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gpios_prop, gpios_prop_name) \
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BUILD_ASSERT( \
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!(DT_NODE_HAS_PROP(node_id, psel_prop) && \
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DT_NODE_HAS_PROP(node_id, gpios_prop)), \
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"Devicetree node " DT_NODE_PATH(node_id) \
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" has both of the " psel_prop_name \
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" and " gpios_prop_name \
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" properties set; you must remove one. " \
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"Note: you can use /delete-property/ to delete properties.")
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/**
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* Like NRF_DT_PSEL_CHECK_NOT_BOTH, but instead checks that exactly one
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* of the properties is set.
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*/
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#define NRF_DT_PSEL_CHECK_EXACTLY_ONE(node_id, \
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psel_prop, psel_prop_name, \
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gpios_prop, gpios_prop_name) \
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BUILD_ASSERT( \
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(DT_NODE_HAS_PROP(node_id, psel_prop) ^ \
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DT_NODE_HAS_PROP(node_id, gpios_prop)), \
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"Devicetree node " DT_NODE_PATH(node_id) \
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" must have exactly one of the " psel_prop_name \
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" and " gpios_prop_name \
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" properties set. " \
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"Note: you can use /delete-property/ to delete properties.")
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/**
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* @brief Convert a devicetree GPIO phandle+specifier to PSEL value
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*
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* Various peripherals in nRF SoCs have pin select registers, which
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* usually have PSEL in their names. The low bits of these registers
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* generally look like this in the register map description:
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*
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* Bit number 5 4 3 2 1 0
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* ID B A A A A A
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*
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* ID Field Value Description
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* A PIN [0..31] Pin number
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* B PORT [0..1] Port number
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*
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* Examples:
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*
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* - pin P0.4 has "PSEL value" 4 (B=0 and A=4)
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* - pin P1.5 has "PSEL value" 37 (B=1 and A=5)
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*
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* This macro converts a devicetree GPIO phandle array value
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* "<&gpioX pin ...>" to a "PSEL value".
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*
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* Note: in Nordic SoC devicetrees, "gpio0" means P0, and "gpio1"
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* means P1. This is encoded in the "port" property of each GPIO node.
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*
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* Examples:
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*
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* foo: my-node {
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* tx-gpios = <&gpio0 4 ...>;
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* rx-gpios = <&gpio1 5 ...>;
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* };
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*
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* NRF_DT_GPIOS_TO_PSEL(DT_NODELABEL(foo), tx_gpios) // 0 + 4 = 4
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* NRF_DT_GPIOS_TO_PSEL(DT_NODELABEL(foo), rx_gpios) // 32 + 5 = 37
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*/
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#define NRF_DT_GPIOS_TO_PSEL(node_id, prop) \
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(DT_GPIO_PIN(node_id, prop) + \
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(DT_PROP_BY_PHANDLE(node_id, prop, port) << 5))
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/**
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* If the node has the property, expands to
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* NRF_DT_GPIOS_TO_PSEL(node_id, prop). The default_value argument is
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* not expanded in this case.
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*
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* Otherwise, expands to default_value.
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*/
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#define NRF_DT_GPIOS_TO_PSEL_OR(node_id, prop, default_value) \
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COND_CODE_1(DT_NODE_HAS_PROP(node_id, prop), \
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(NRF_DT_GPIOS_TO_PSEL(node_id, prop)), \
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(default_value))
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/**
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* Error out the build if 'prop' is set on node 'node_id' and
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* DT_GPIO_CTLR(node_id, prop) is not an SoC GPIO controller,
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* i.e. a node with compatible "nordic,nrf-gpio".
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*
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* Otherwise, do nothing.
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*
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* @param node_id node identifier
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* @param prop lowercase-and-underscores PSEL style property
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* @param prop_name human-readable string name for 'prop'
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*/
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#define NRF_DT_CHECK_GPIO_CTLR_IS_SOC(node_id, prop, prop_name) \
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COND_CODE_1(DT_NODE_HAS_PROP(node_id, prop), \
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(BUILD_ASSERT(DT_NODE_HAS_COMPAT( \
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DT_GPIO_CTLR(node_id, prop), \
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nordic_nrf_gpio), \
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"Devicetree node " \
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DT_NODE_PATH(node_id) \
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" property " prop_name \
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" must refer to a GPIO controller " \
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"with compatible nordic,nrf-gpio; " \
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"got " \
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DT_NODE_PATH(DT_GPIO_CTLR(node_id, \
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prop)) \
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", which does not have this " \
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"compatible")), \
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(BUILD_ASSERT(1, \
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"NRF_DT_CHECK_GPIO_CTLR_IS_SOC: OK")))
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/* Note: allow a trailing ";" either way */
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#endif /* !_ASMLANGUAGE */
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#endif
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