[PATCH v2] bsps/shared/ofw: Implement RTEMS OFW interface
Niteesh G. S.
niteesh.gs at gmail.com
Fri Aug 21 17:28:04 UTC 2020
On Thu, Aug 20, 2020 at 1:22 PM G S Niteesh Babu <niteesh.gs at gmail.com>
wrote:
> RTEMS OFW is a FDT only implementation of the OpenFirmWare
> interface. This API is created to be compatible with FreeBSD
> OpenFirmWare interface. The main intention is to make
> porting of FreeBSD drivers to RTEMS easier.
>
> Most functions implemented have an direct one-one mapping
> with the original OFW API and some extra auxiliary functions
> were implemented to make working with device trees easier in
> RTEMS.
>
> Update #3784
> ---
> bsps/include/ofw/ofw.h | 548 +++++++++++++++++++++++++++
> bsps/include/ofw/ofw_compat.h | 74 ++++
> bsps/shared/ofw/ofw.c | 670 ++++++++++++++++++++++++++++++++++
> spec/build/bsps/obj.yml | 4 +
> 4 files changed, 1296 insertions(+)
> create mode 100644 bsps/include/ofw/ofw.h
> create mode 100644 bsps/include/ofw/ofw_compat.h
> create mode 100644 bsps/shared/ofw/ofw.c
>
> diff --git a/bsps/include/ofw/ofw.h b/bsps/include/ofw/ofw.h
> new file mode 100644
> index 0000000000..50f64ff695
> --- /dev/null
> +++ b/bsps/include/ofw/ofw.h
> @@ -0,0 +1,548 @@
> +/* SPDX-License-Identifier: BSD-2-Clause */
> +
> +/**
> + * @file
> + *
> + * @ingroup ofw
> + *
> + * RTEMS FDT implementation of OpenFirmWare Interface.
> + *
> + * RTEMS OFW is a FDT only implementation of the OpenFirmWare interface.
> + * This API is created to be compatible with FreeBSD OpenFirmWare
> interface.
> + * The main intention is to make porting of FreeBSD drivers to RTEMS
> easier.
> + */
> +
> +/*
> + * Copyright (C) 2020 Niteesh Babu G S <niteesh.gs at gmail.com>
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> "AS IS"
> + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
> THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
> PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
> BE
> + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
> BUSINESS
> + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
> THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#ifndef _OFW_H
> +#define _OFW_H
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +#include <rtems.h>
> +#include <stdint.h>
> +#include <stddef.h>
> +
> +/**
> + * Represents a node in the device tree. The offset from fdtp to node is
> used
> + * instead of fdt offset to make sure this is compatible with OF
> interface in
> + * FreeBSD.
> + */
> +typedef uint32_t phandle_t;
> +/**
> + * Represents the effective phandle of the node.
> + */
> +typedef uint32_t ihandle_t;
> +/**
> + * Represents the data type of the buffer.
> + */
> +typedef uint32_t pcell_t;
> +
> +/**
> + * @struct rtems_ofw_memory_area
> + *
> + * This is used to represent elements(FDT properties) that define
> + * region of memory address.
> + */
> +typedef struct {
> + /** The start address of the memory region. */
> + uint32_t start;
> + /** The size of the memory region. */
> + uint32_t size;
> +} rtems_ofw_memory_area;
> +
> +/**
> + * @struct rtems_ofw_ranges
> + *
> + * This is used to represent the ranges property in the device tree.
> + */
> +typedef struct {
> + /** The physical address within the child bus address space */
> + uint32_t child_bus;
> + /** The physical address within the parent bus address space */
> + uint32_t parent_bus;
> + /** The size of the range in the child’s address space */
> + uint32_t size;
> +} rtems_ofw_ranges;
> +
> +/**
> + * @brief Gets the node that is next to @a node.
> + *
> + * @param[in] node Node offset
> + *
> + * @retval Peer node offset Successful operation.
> + * @retval 0 No peer node or invalid node handle
> + */
> +phandle_t rtems_ofw_peer(
> + phandle_t node
> +);
> +
> +/**
> + * @brief Gets the node that is the child of @a node.
> + *
> + * @param[in] node Node offset
> + *
> + * @retval child node offset Successful operation.
> + * @retval 0 No child node or invalid node handle
> + */
> +phandle_t rtems_ofw_child(
> + phandle_t node
> +);
> +
> +/**
> + * @brief Gets the node that is the parent of @a node.
> + *
> + * @param[in] node Node offset
> + *
> + * @retval child node offset Successful operation.
> + * @retval 0 No child node or invalid node handle
> + */
> +phandle_t rtems_ofw_parent(
> + phandle_t node
> +);
> +
> +/**
> + * @brief Gets the length of the property mentioned in @a propname.
> + *
> + * @param[in] node Node offset
> + * @param[in] prop Property name
> + *
> + * @retval -1 Invalid node or property
> + * @retval Length of property on successful operation
> + */
> +size_t rtems_ofw_get_prop_len(
> + phandle_t node,
> + const char *propname
> +);
> +
> +/**
> + * @brief Gets the value of property mentioned in @a propname.
> + *
> + * @param[in] node Node offset
> + * @param[in] prop Property name
> + * @param[out] buf The property value gets stored in this buffer
> (Pre-allocated)
> + * @param[in] len Length of the buffer
> +
> + * @retval -1 Invalid node or property
> + * @retval Length of property on successful operation
> + */
> +size_t rtems_ofw_get_prop(
> + phandle_t node,
> + const char *propname,
> + void *buf,
> + size_t len
> +);
> +
> +/**
> + * @brief Gets the value of property mentioned in @a prop.
> + *
> + * Gets the value of property of @a node and converts the value into the
> host's
> + * endianness.
> + *
> + * @param[in] node Node offset
> + * @param[in] prop Property name
> + * @param[out] buf The property value gets stored in this
> buffer(Pre-allocated)
> + * after converted to the host's endianness
> + * @param[in] len Length of the buffer
> + *
> + * @retval -1 Invalid node or property
> + * @retval Length of property on successful operation
> + */
> +size_t rtems_ofw_get_enc_prop(
> + phandle_t node,
> + const char *prop,
> + pcell_t *buf,
> + size_t len
> +);
> +
> +/**
> + * @brief Checks if the property @a propname is present in @a node.
> + *
> + * @param[in] node Node offset
> + * @param[in] propname Property name
> + *
> + * @retval 0 Property not present.
> + * @retval 1 Property is present.
> + */
> +int rtems_ofw_has_prop(
> + phandle_t node,
> + const char *propname
> +);
> +
> +/**
> + * @brief Searches for property @a propname in @a node.
> + *
> + * Searches the node and its parent recursively for the property and
> fills the
> + * buffer with the first found value.
> + *
> + * @param[in] node Node offset
> + * @param[in] propname Property name
> + * @param[out] buf The property value gets stored in this buffer
> (Pre-allocated)
> + * @param[in] len Length of the buffer
> + *
> + * @retval Length of the property if property is found.
> + * @retval -1 Property is not found.
> + */
> +size_t rtems_ofw_search_prop(
> + phandle_t node,
> + const char *propname,
> + void *buf,
> + size_t len
> +);
> +
> +/**
> + * @brief Searches for property @a propname in @a node.
> + *
> + * Searches the node and its parent recursively for the property and
> fills the
> + * buffer with the first value found after converting it to the
> endianness of
> + * the host.
> + *
> + * @param[in] node Node offset
> + * @param[in] propname Property name
> + * @param[out] buf The property value gets stored in this
> buffer(Pre-allocated)
> + * after converted to the host's endianness
> + * @param[in] len Length of the buffer
> + *
> + * @retval Length of the property if property is found.
> + * @retval -1 Property is not found.
> + */
> +size_t rtems_ofw_search_enc_prop(
> + phandle_t node,
> + const char *propname,
> + pcell_t *buf,
> + size_t len
> +);
> +
> +/**
> + * @brief Gets the value of property mentioned in @a propname.
> + *
> + * Same as rtems_ofw_getprop, but the @a buf is allocated in this routine
> and
> + * the user is responsible for freeing it.
> + *
> + * @param[in] node Node offset
> + * @param[in] propname Property name
> + * @param[out] buf The buffer is allocated in this routine and user is
> + * responsible for freeing.
> + *
> + * @retval -1 Property is not found.
> + * @retval Length of the property if property is found.
> + */
> +size_t rtems_ofw_get_prop_alloc(
> + phandle_t node,
> + const char *propname,
> + void **buf
> +);
> +
> +/**
> + * @brief Gets multiple values of the property @a propname.
> + *
> + * Same as rtems_ofw_getprop_alloc but it can read properties with
> multiple
> + * values.
> + * For eg: reg = <0x1000 0x10 0x2000 0x20>
> + *
> + * @param[in] node Node offset
> + * @param[in] propname Property name
> + * @param[in] elsz Size of the single value
> + * @param[out] buf The buffer is allocated in this routine and user is
> + * responsible for freeing.
> + *
> + * @retval -1 Property is not found.
> + * @retval Number of values read.
> + */
> +size_t rtems_ofw_get_prop_alloc_multi(
> + phandle_t node,
> + const char *propname,
> + int elsz,
> + void **buf
> +);
> +
> +/**
> + * @brief Gets the value of property mentioned in @a propname.
> + *
> + * Same as rtems_ofw_getprop_alloc but the value stored in the buffer is
> + * converted into the host's endianness.
> + *
> + * @param[in] node Node offset
> + * @param[in] propname Property name
> + * @param[out] buf The buffer is allocated in this routine and user is
> + * responsible for freeing.
> + *
> + * @retval -1 Property is not found.
> + * @retval Length of the property if property is found.
> + */
> +size_t rtems_ofw_get_enc_prop_alloc(
> + phandle_t node,
> + const char *propname,
> + void **buf
> +);
> +
> +/**
> + * @brief Gets multiple values of the property @a propname.
> + *
> + * Same as rtems_ofw_getprop_alloc_multi but the values stored in the
> buffer
> + * are converted to the host's endianness.
> + *
> + * @param[in] node Node offset
> + * @param[in] propname Property name
> + * @param[in] elsz Size of the single value
> + * @param[out] buf The buffer is allocated in this routine and user is
> + * responsible for freeing.
> + *
> + * @retval -1 Property is not found.
> + * @retval Number of values read.
> + */
> +size_t rtems_ofw_get_enc_prop_alloc_multi(
> + phandle_t node,
> + const char *propname,
> + int elsz,
> + void **buf
> +);
> +
> +/**
> + * @brief Free's the buffers allocated by the rtems_ofw_*_alloc functions.
> + *
> + * @param[in] buf Buffer to be freed
> + */
> +void rtems_ofw_free(
> + void *buf
> +);
> +
> +/**
> + * @brief Finds the next property of @a node.
> + *
> + * Finds the next property of the node and when @a propname is NULL it
> returns
> + * the value in the first property.
> + *
> + * @param[in] node Node offset
> + * @param[in] previous Previous property name
> + * @param[out] buf The value of the next property gets stored in this
> buffer
> + * (Pre-allocated)
> + * @param[in] len Length of the buffer
> + *
> + * @retval -1 node or previous property does not exist
> + * @retval 0 no more properties
> + * @retval 1 success
> + */
> +int rtems_ofw_next_prop(
> + phandle_t node,
> + const char *previous,
> + char *buf,
> + size_t len
> +);
> +
> +/**
> + * @brief Sets the property @name of @a node to @a buf.
> + *
> + * @param[in] node Node offset
> + * @param[in] name Property name
> + * @param[in] buf Buffer contains the value to be set.
> + * @param[in] len Length of the buffer
> + *
> + * @retval -1 node does not exist
> + * @retval 0 on success
> + * @retval libFDT error codes on unsuccessful setting operation
> + */
> +int rtems_ofw_set_prop(
> + phandle_t node,
> + const char *name,
> + const void *buf,
> + size_t len
> +);
> +
> +/**
> + * @brief Converts a device specifier to a fully qualified path name.
> + *
> + * @param[in] dev device specifier
> + * @param[out] buf The path is filled into the buffer(Pre-allocated)
> + * @param[in] length of the buffer
> + *
> + * @retval -1 always. Unimplemented.
> + */
> +size_t rtems_ofw_canon(
> + const char *dev,
> + char *buf,
> + size_t len
> +);
> +
> +/**
> + * @brief Finds the node at the given path
> + *
> + * @param[in] path to the node from root
> + *
> + * @retval -1 node does not exist
> + * @retval node handle on success
> + */
> +phandle_t rtems_ofw_find_device(
> + const char *path
> +);
> +
> +/**
> + * @brief This routine converts effective phandle @a xref to node offset.
> + *
> + * @param[in] xref Node phandle
> + *
> + * @retval Node offset on success
> + * @retval Node phandle on failure
> + */
> +phandle_t rtems_ofw_node_from_xref(
> + phandle_t xref
> +);
> +
> +/**
> + * @brief This routine converts node offset to effective phandle of @a
> node.
> + *
> + * @retval Node phandle on success
> + * @retval Node offset on failure
> + */
> +phandle_t rtems_ofw_xref_from_node(
> + phandle_t node
> +);
> +
> +/*
> + * instance handles(ihandle_t) as same as phandles in the FDT
> implementation
> + * of OF interface.
> + */
> +
> +/**
> + * @brief Converts @a instance handle to phandle.
> + *
> + * instance are same as node offsets in FDT.
> + *
> + * @param[in] instance Node offset
> + *
> + * @retval phandle of node on success.
> + * @retval instance of node on failure.
> + */
> +phandle_t rtems_ofw_instance_to_package(
> + ihandle_t instance
> +);
> +
> +/**
> + * @brief Find the node's path from phandle.
> + *
> + * @param[in] node Node offset
> + * @param[out] buf Path is filled into this buffer(Pre-allocated).
> + * @param[in] len Length of the buffer.
> + *
> + * @retval -1 always. Unimplemented.
> + */
> +size_t rtems_ofw_package_to_path(
> + phandle_t node,
> + char *buf,
> + size_t len
> +);
> +
> +/**
> + * @brief Find the node's path from ihandle.
> + *
> + * @param[in] instance Node offset
> + * @param[out] buf Path is filled into this buffer(Pre-allocated).
> + * @param[in] len Length of the buffer.
> + *
> + * @retval -1 always. Unimplemented.
> + */
> +size_t rtems_ofw_instance_to_path(
> + ihandle_t instance,
> + char *buf,
> + size_t len
> +);
> +
> +/**
> + * @brief Queries the node's reg value.
> + *
> + * This routine fills the buffer @a buf with the values in reg property
> of node
> + * @a node. It reads all the values of the property and fills the buffer
> to max
> + * size.
> + * This routine is local to RTEMS OFW and does not have an corresponding
> + * FreeBSD OFW pair.
> + *
> + * @param[in] node Node offset
> + * @param[out] buf Register values are stored in this
> buffer(Pre-allocated).
> + * @param[in] size Length of the buffer.
> + *
> + * @retval -1 If reg property is missing.
> + * @retval Length of the reg property in bytes.
> + */
> +int rtems_ofw_get_reg(
> + phandle_t node,
> + rtems_ofw_memory_area *buf,
> + size_t size
> +);
> +
> +/**
> + * @brief Queries the node's interrupt value.
> + *
> + * This routine fills the buffer @a buf with the interrupt number. In
> case of
> + * multiple numbers it fills the buffer to its full extent.
> + * This routine is local to RTEMS OFW and does not have an corresponding
> + * FreeBSD OFW pair.
> + *
> + * @param[in] node Node offset
> + * @param[out] buf Interrupt values are stored in this
> buffer(Pre-allocated).
> + * @param[in] size Length of the buffer.
> + *
> + * @retval -1 If interrupts property is missing.
> + * @retval The number of interrupt numbers read.
> + */
> +int rtems_ofw_get_interrupts(
> + phandle_t node,
> + rtems_vector_number *buf,
> + size_t size
> +);
> +
> +/**
> + * @brief Queries the node's status.
> + *
> + * This routine is local to RTEMS OFW and does not have an corresponding
> + * FreeBSD OFW pair.
> + *
> + * @param[in] node Node offset
> + *
> + * @retval true Status is OK or empty.
> + * @retval false Status is not OK or missing.
> + */
> +bool rtems_ofw_node_status( phandle_t node );
> +
> +/**
> + * @brief Gets node phandle from compatible property.
> + *
> + * This routine is local to RTEMS OFW and does not have an corresponding
> + * FreeBSD OFW pair.
> + *
> + * @param[in] compat Compatible string
> + *
> + * @retval 0 Node with @a compat as compatible string not found
> + * @retval Node phandle on success.
> + */
> +phandle_t rtems_ofw_find_device_by_compat( const char *compat );
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif /* _OFW_H */
> diff --git a/bsps/include/ofw/ofw_compat.h b/bsps/include/ofw/ofw_compat.h
> new file mode 100644
> index 0000000000..be4a5ea3ce
> --- /dev/null
> +++ b/bsps/include/ofw/ofw_compat.h
> @@ -0,0 +1,74 @@
> +/* SPDX-License-Identifier: BSD-2-Clause */
> +
> +/**
> + * @file
> + *
> + * @ingroup ofw
> + *
> + * This file defines necessary symbols to make the RTEMS OFW API
> compatible
> + * with FreeBSD OFW.
> + */
> +
> +/*
> + * Copyright (C) 2020 Niteesh Babu G S <niteesh.gs at gmail.com>
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> "AS IS"
> + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
> THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
> PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
> BE
> + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
> BUSINESS
> + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
> THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#ifndef _OFW_COMPAT_H
> +#define _OFW_COMPAT_H
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +#include <ofw/ofw.h>
> +
> +#define OF_peer rtems_ofw_peer
> +#define OF_child rtems_ofw_child
> +#define OF_parent rtems_ofw_parent
> +#define OF_getproplen rtems_ofw_get_prop_len
> +#define OF_getprop rtems_ofw_get_prop
> +#define OF_getencprop rtems_ofw_get_enc_prop
> +#define OF_hasprop rtems_ofw_has_prop
> +#define OF_searchprop rtems_ofw_search_prop
> +#define OF_searchencprop rtems_ofw_search_enc_prop
> +#define OF_getprop_alloc rtems_ofw_get_prop_alloc
> +#define OF_getprop_alloc_multi rtems_ofw_get_prop_alloc_multi
> +#define OF_getencprop_alloc_multi rtems_ofw_get_enc_prop_alloc_multi
> +#define OF_getencprop_alloc rtems_ofw_get_enc_prop_alloc
> +#define OF_prop_free rtems_ofw_free
> +#define OF_nextprop rtems_ofw_next_prop
> +#define OF_setprop rtems_ofw_set_prop
> +#define OF_canon rtems_ofw_canon
> +#define OF_finddevice rtems_ofw_find_device
> +#define OF_package_to_path rtems_ofw_package_to_path
> +#define OF_node_from_xref rtems_ofw_node_from_xref
> +#define OF_xref_from_node rtems_ofw_xref_from_node
> +#define OF_instance_to_package rtems_ofw_instance_to_package
> +#define OF_instance_to_path rtems_ofw_instance_to_path
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif /* _OFW_COMPAT_H */
> diff --git a/bsps/shared/ofw/ofw.c b/bsps/shared/ofw/ofw.c
> new file mode 100644
> index 0000000000..481b29553b
> --- /dev/null
> +++ b/bsps/shared/ofw/ofw.c
> @@ -0,0 +1,670 @@
> +/* SPDX-License-Identifier: BSD-2-Clause */
> +
> +/**
> + * @file
> + *
> + * @ingroup ofw
> + */
> +
> +/*
> + * Copyright (C) 2020 Niteesh Babu G S <niteesh.gs at gmail.com>
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> "AS IS"
> + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
> THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
> PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
> BE
> + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
> BUSINESS
> + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
> THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#ifdef HAVE_CONFIG_H
> +#include "config.h"
> +#endif
> +
> +#include <bsp/fdt.h>
> +#include <sys/param.h>
> +#include <ofw/ofw.h>
> +#include <libfdt.h>
> +#include <assert.h>
> +#include <rtems/sysinit.h>
> +
> +const void *fdtp = NULL;
> +
> +static phandle_t rtems_fdt_offset_to_phandle( int offset )
> +{
> + if (offset < 0) {
> + return 0;
> + }
> +
> + return (phandle_t)offset + fdt_off_dt_struct(fdtp);
> +}
> +
> +static int rtems_fdt_phandle_to_offset( phandle_t handle )
> +{
> + int off;
> + int fdt_off;
> +
> + off = (int) handle;
> + fdt_off = fdt_off_dt_struct(fdtp);
> +
> + if (off < fdt_off) {
> + return -1;
> +
> + }
> +
> + return off - fdt_off;
> +}
> +
> +static void rtems_ofw_init( void ) {
> + int rv;
> + const void *fdt;
> +
> + fdt = bsp_fdt_get();
> +
> + rv = fdt_check_header(fdt);
> +
> + /*
> + * If the FDT is invalid exit through fatal.
> + */
> + if (rv != 0) {
> + rtems_fatal_error_occurred(RTEMS_NOT_CONFIGURED);
> + }
> +
> + fdtp = fdt;
> +}
> +
> +RTEMS_SYSINIT_ITEM(
> + rtems_ofw_init,
> + RTEMS_SYSINIT_BSP_PRE_DRIVERS,
> + RTEMS_SYSINIT_ORDER_FIRST
> +);
> +
> +phandle_t rtems_ofw_peer( phandle_t node )
> +{
> + int offset;
> +
> + if (node == 0) {
> + int root = fdt_path_offset(fdtp, "/");
> + return rtems_fdt_offset_to_phandle(root);
> + }
> +
> + offset = rtems_fdt_phandle_to_offset(node);
> + if (offset < 0) {
> + return 0;
> + }
> +
> + offset = fdt_next_subnode(fdtp, offset);
> + return rtems_fdt_offset_to_phandle(offset);
> +}
> +
> +phandle_t rtems_ofw_child( phandle_t node )
> +{
> + int offset;
> +
> + offset = rtems_fdt_phandle_to_offset(node);
> +
> + if (offset < 0) {
> + return 0;
> + }
> +
> + offset = fdt_first_subnode(fdtp, offset);
> + return rtems_fdt_offset_to_phandle(offset);
> +}
> +
> +phandle_t rtems_ofw_parent( phandle_t node )
> +{
> + int offset;
> +
> + offset = rtems_fdt_phandle_to_offset(node);
> +
> + if (offset < 0) {
> + return 0;
> + }
> +
> + offset = fdt_parent_offset(fdtp, offset);
> + return rtems_fdt_offset_to_phandle(offset);
> +}
> +
> +size_t rtems_ofw_get_prop_len(
> + phandle_t node,
> + const char *propname
> +)
> +{
> + int offset;
> + int len;
> + const void *prop;
> +
> + offset = rtems_fdt_phandle_to_offset(node);
> +
> + if (offset < 0) {
> + return -1;
> + }
> +
> + prop = fdt_getprop(fdtp, offset, propname, &len);
> +
> + if (prop == NULL && strcmp(propname, "name") == 0) {
> + fdt_get_name(fdtp, offset, &len);
> + return len + 1;
> + }
> +
> + if (prop == NULL && strcmp(propname, "/chosen") == 0) {
> + if (strcmp(propname, "fdtbootcpu") == 0)
> + return sizeof(pcell_t);
> + if (strcmp(propname, "fdtmemreserv") == 0)
> + return 2 * sizeof(uint64_t) * fdt_num_mem_rsv(fdtp);
> + }
> +
> + if (prop == NULL) {
> + return -1;
> + }
> +
> + return len;
> +}
> +
> +size_t rtems_ofw_get_prop(
> + phandle_t node,
> + const char *propname,
> + void *buf,
> + size_t bufsize
> +)
> +{
> + const void *prop;
> + int offset;
> + int len;
> + uint32_t cpuid;
> +
> + offset = rtems_fdt_phandle_to_offset(node);
> +
> + if (offset < 0) {
> + return -1;
> + }
> +
> + prop = fdt_getprop(fdtp, offset, propname, &len);
> +
> + if (prop == NULL && strcmp(propname, "name") == 0) {
> + prop = fdt_get_name(fdtp, offset, &len);
> + strncpy(buf, prop, bufsize);
> + return len + 1;
> + }
> +
> + if (prop == NULL && strcmp(propname, "/chosen") == 0) {
> + if (strcmp(propname, "fdtbootcpu") == 0) {
> + cpuid = cpu_to_fdt32(fdt_boot_cpuid_phys(fdtp));
> + len = sizeof(cpuid);
> + prop = &cpuid;
> + }
> + if (strcmp(propname, "fdtmemreserv") == 0) {
> + prop = (char *)fdtp + fdt_off_mem_rsvmap(fdtp);
> + len = sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp);
> + }
> + }
> +
> + if (prop == NULL) {
> + return -1;
> + }
> +
> + bcopy(prop, buf, MIN(len, bufsize));
> +
> + return len;
> +}
> +
> +size_t rtems_ofw_get_enc_prop(
> + phandle_t node,
> + const char *prop,
> + pcell_t *buf,
> + size_t len
> +)
> +{
> + size_t rv;
> +
> + assert(len % 4 == 0);
> + rv = rtems_ofw_get_prop(node, prop, buf, len);
> +
> + if (rv < 0) {
> + return rv;
> + }
> +
> + for (int i = 0; i < (len / 4); i++) {
> + buf[i] = fdt32_to_cpu(buf[i]);
> + }
> +
> + return rv;
> +}
> +
> +int rtems_ofw_has_prop(
> + phandle_t node,
> + const char *propname
> +)
> +{
> + size_t rv;
> +
> + rv = rtems_ofw_get_prop_len(node, propname);
> + return rv >= 0 ? 1 : 0;
> +}
> +
> +size_t rtems_ofw_search_prop(
> + phandle_t node,
> + const char *propname,
> + void *buf,
> + size_t len
> +)
> +{
> + size_t rv;
> +
> + for (; node != 0; node = rtems_ofw_parent(node)) {
> + if ((rv = rtems_ofw_get_prop(node, propname, buf, len) != -1)) {
> + return rv;
> + }
> + }
> +
> + return -1;
> +}
> +
> +size_t rtems_ofw_search_enc_prop(
> + phandle_t node,
> + const char *propname,
> + pcell_t *buf,
> + size_t len
> +)
> +{
> + size_t rv;
> +
> + for (; node != 0; node = rtems_ofw_parent(node)) {
> + if ((rv = rtems_ofw_get_enc_prop(node, propname, buf, len) != -1)) {
> + return rv;
> + }
> + }
> +
> + return -1;
> +}
> +
> +size_t rtems_ofw_get_prop_alloc(
> + phandle_t node,
> + const char *propname,
> + void **buf
> +)
> +{
> + size_t len;
> +
> + *buf = NULL;
> + if ((len = rtems_ofw_get_prop_len(node, propname)) == -1) {
> + return -1;
> + }
> +
> + if (len > 0) {
> + *buf = malloc(len);
> +
> + if (rtems_ofw_get_prop(node, propname, *buf, len) == -1) {
> + rtems_ofw_free(buf);
> + *buf = NULL;
> + return -1;
> + }
> + }
> +
> + return len;
> +}
> +
> +size_t rtems_ofw_get_prop_alloc_multi(
> + phandle_t node,
> + const char *propname,
> + int elsz,
> + void **buf
> +)
> +{
> + size_t len;
> +
> + *buf = NULL;
> + if ((len = rtems_ofw_get_prop_len(node, propname)) == -1 ||
> + (len % elsz != 0)) {
> + return -1;
> + }
>
While going through the code again, a question raised inside me,
In the above code, the function rtems_ofw_get_prop_len returns
a size_t which is an unsigned value, I compare that to -1 is that
OK from a code review point of view or should I change the type
of len to -1?
+
> + if (len > 0) {
> + *buf = malloc(len);
> +
> + if (rtems_ofw_get_prop(node, propname, *buf, len) == -1) {
> + rtems_ofw_free(buf);
> + *buf = NULL;
> + return -1;
> + }
> + }
> +
> + return (len / elsz);
> +}
> +
> +size_t rtems_ofw_get_enc_prop_alloc(
> + phandle_t node,
> + const char *propname,
> + void **buf
> +)
> +{
> + size_t len;
> +
> + *buf = NULL;
> + if ((len = rtems_ofw_get_prop_len(node, propname)) == -1) {
> + return -1;
> + }
> +
> + if (len > 0) {
> + *buf = malloc(len);
> +
> + if (rtems_ofw_get_enc_prop(node, propname, *buf, len) == -1) {
> + rtems_ofw_free(buf);
> + *buf = NULL;
> + return -1;
> + }
> + }
> +
> + return len;
> +}
> +
> +size_t rtems_ofw_get_enc_prop_alloc_multi(
> + phandle_t node,
> + const char *propname,
> + int elsz,
> + void **buf
> +)
> +{
> + size_t len;
> +
> + *buf = NULL;
> + if ((len = rtems_ofw_get_prop_len(node, propname)) == -1 ||
> + (len % elsz != 0)) {
> + return -1;
> + }
> +
> + if (len > 0) {
> + *buf = malloc(len);
> +
> + if (rtems_ofw_get_enc_prop(node, propname, *buf, len) == -1) {
> + rtems_ofw_free(buf);
> + *buf = NULL;
> + return -1;
> + }
> + }
> +
> + return (len / elsz);
> +}
> +
> +void rtems_ofw_free( void *buf )
> +{
> + free(buf);
> +}
> +
> +int rtems_ofw_next_prop(
> + phandle_t node,
> + const char *previous,
> + char *buf,
> + size_t len
> +)
> +{
> + const void *name;
> + const void *prop;
> + int offset;
> +
> + offset = rtems_fdt_phandle_to_offset(node);
> +
> + if (offset < 0) {
> + return -1;
> + }
> +
> + if (previous == NULL) {
> + offset = fdt_first_property_offset(fdtp, offset);
> + } else {
> + fdt_for_each_property_offset(offset, fdtp, offset) {
> + prop = fdt_getprop_by_offset(fdtp, offset, (const char **)&name,
> NULL);
> + if (prop == NULL)
> + return -1;
> +
> + if (strcmp(previous, name) != 0)
> + continue;
> +
> + offset = fdt_next_property_offset(fdtp, offset);
> + break;
> + }
> + }
> +
> + if (offset < 0)
> + return 0;
> +
> + prop = fdt_getprop_by_offset(fdtp, offset, (const char **)&name,
> &offset);
> + if (prop == NULL)
> + return -1;
> +
> + strncpy(buf, name, len);
> +
> + return 1;
> +}
> +
> +int rtems_ofw_set_prop(
> + phandle_t node,
> + const char *name,
> + const void *buf,
> + size_t len
> +)
> +{
> + int offset;
> +
> + offset = rtems_fdt_phandle_to_offset(node);
> +
> + if (offset < 0)
> + return -1;
> +
> + if (fdt_setprop_inplace(fdtp, offset, name, buf, len) != 0)
> + return (fdt_setprop(fdtp, offset, name, buf, len));
> +
> + return 0;
> +}
> +
> +phandle_t rtems_ofw_find_device( const char *path )
> +{
> + int offset;
> +
> + offset = fdt_path_offset(fdtp, path);
> + if (offset < 0)
> + return -1;
> +
> + return rtems_fdt_offset_to_phandle(offset);
> +}
> +
> +static phandle_t rtems_ofw_get_effective_phandle(
> + phandle_t node,
> + phandle_t xref
> +)
> +{
> + phandle_t child;
> + phandle_t ref;
> +
> + for (child = rtems_ofw_child(node); child != 0; child =
> rtems_ofw_peer(child)) {
> + ref = rtems_ofw_get_effective_phandle(child, xref);
> + if (ref != -1)
> + return ref;
> +
> + if (rtems_ofw_get_enc_prop(child, "phandle", &ref, sizeof(ref)) == -1
> &&
> + rtems_ofw_get_enc_prop(child, "ibm,phandle", &ref, sizeof(ref))
> == -1 &&
> + rtems_ofw_get_enc_prop(child, "linux,phandle", &ref, sizeof(ref))
> == -1
> + ) {
> + continue;
> + }
> +
> + if (ref == xref)
> + return child;
> + }
> +
> + return -1;
> +}
> +
> +phandle_t rtems_ofw_node_from_xref( phandle_t xref )
> +{
> + phandle_t node;
> +
> + if ((node = rtems_ofw_get_effective_phandle(rtems_ofw_peer(0), xref))
> == -1)
> + return xref;
> +
> + return node;
> +}
> +
> +phandle_t rtems_ofw_xref_from_node( phandle_t node )
> +{
> + phandle_t ref;
> +
> + if (rtems_ofw_get_enc_prop(node, "phandle", &ref, sizeof(ref)) == -1
> &&
> + rtems_ofw_get_enc_prop(node, "ibm,phandle", &ref, sizeof(ref)) ==
> -1 &&
> + rtems_ofw_get_enc_prop(node, "linux,phandle", &ref, sizeof(ref))
> == -1)
> + {
> + return node;
> + }
> +
> + return ref;
> +}
> +
> +phandle_t rtems_ofw_instance_to_package( ihandle_t instance )
> +{
> + return rtems_ofw_node_from_xref(instance);
> +}
> +
> +size_t rtems_ofw_package_to_path(
> + phandle_t node,
> + char *buf,
> + size_t len
> +)
> +{
> + int offset;
> + int rv;
> +
> + offset = rtems_fdt_phandle_to_offset(node);
> +
> + rv = fdt_get_path(fdtp, offset, buf, len);
> + if (rv != 0)
> + return -1;
> +
> + return rv;
> +}
> +
> +size_t rtems_ofw_instance_to_path(
> + ihandle_t instance,
> + char *buf,
> + size_t len
> +)
> +{
> + int offset;
> + int rv;
> +
> + offset = rtems_ofw_instance_to_package(instance);
> + offset = rtems_fdt_phandle_to_offset(offset);
> +
> + rv = fdt_get_path(fdtp, offset, buf, len);
> + if (rv != 0)
> + return -1;
> +
> + return rv;
> +}
> +
> +int rtems_ofw_get_reg(
> + phandle_t node,
> + rtems_ofw_memory_area *buf,
> + size_t size
> +)
> +{
> + int len;
> + int offset;
> + int nranges;
> + int nregs;
> + phandle_t parent;
> + rtems_ofw_ranges range;
> + const rtems_ofw_ranges *ptr;
> +
> + len = rtems_ofw_get_enc_prop(node, "reg", (pcell_t *)buf, size);
> + if (len <= 0) {
> + return len;
> + }
> +
> + nregs = MIN(len, size) / sizeof(rtems_ofw_memory_area);
> +
> + for (parent = rtems_ofw_parent(node); parent > 0;
> + parent = rtems_ofw_parent(parent)) {
> +
> + offset = rtems_fdt_phandle_to_offset(parent);
> + ptr = fdt_getprop(fdtp, offset, "ranges", &len);
> +
> + if (len < 0) {
> + break;
> + }
> +
> + nranges = len / sizeof(rtems_ofw_ranges);
> +
> + offset = 0;
> + for (int i=0; i < nregs; i++) {
> + for (int j=0; j < nranges; j++) {
> +
> + range.parent_bus = fdt32_to_cpu(ptr[j].parent_bus);
> + range.child_bus = fdt32_to_cpu(ptr[j].child_bus);
> + range.size = fdt32_to_cpu(ptr[j].size);
> +
> + if (buf[i].start >= range.child_bus &&
> + buf[i].start < range.child_bus + range.size) {
> + offset = range.parent_bus - range.child_bus;
> + break;
> + }
> +
> + }
> + buf[i].start += offset;
> + }
> + }
> +
> + return nregs;
> +}
> +
> +int rtems_ofw_get_interrupts(
> + phandle_t node,
> + rtems_vector_number *buf,
> + size_t size
> +)
> +{
> + int rv;
> +
> + rv = rtems_ofw_get_enc_prop(node, "interrupts", buf, size);
> +
> + if (rv <= 0) {
> + return rv;
> + }
> +
> + return MIN(size, rv) / sizeof(rtems_vector_number);
> +}
> +
> +bool rtems_ofw_node_status( phandle_t node )
> +{
> + int len;
> + const char buf[10];
> +
> + len = rtems_ofw_get_prop(node, "status", &buf[0], sizeof(buf));
> + if ((len == -1) ||
> + (strncmp(buf, "okay", MIN(5, len)) == 0) ||
> + (strncmp(buf, "ok", MIN(3, len)) == 0)) {
> + return true;
> + }
> +
> + return false;
> +}
> +
> +phandle_t rtems_ofw_find_device_by_compat( const char *compat )
> +{
> + int offset;
> +
> + offset = fdt_node_offset_by_compatible(fdtp, -1, compat);
> + return rtems_fdt_offset_to_phandle(offset);
> +}
> diff --git a/spec/build/bsps/obj.yml b/spec/build/bsps/obj.yml
> index 8809238057..141ba25f5e 100644
> --- a/spec/build/bsps/obj.yml
> +++ b/spec/build/bsps/obj.yml
> @@ -24,6 +24,9 @@ install:
> - bsps/include/bsp/u-boot.h
> - bsps/include/bsp/uart-output-char.h
> - bsps/include/bsp/utility.h
> +- destination: ${BSP_INCLUDEDIR}/ofw
> + source:
> + - bsps/include/ofw/ofw.h
> - destination: ${BSP_INCLUDEDIR}/libchip
> source:
> - bsps/include/libchip/am29lv160.h
> @@ -104,4 +107,5 @@ source:
> - bsps/shared/dev/serial/z85c30_reg.c
> - bsps/shared/start/bootcard.c
> - bsps/shared/rtems-version.c
> +- bsps/shared/ofw/ofw.c
> type: build
> --
> 2.17.1
>
>
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