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dm: SMEM (Shared memory) uclass
This is a uclass for Shared memory manager drivers. A Shared Memory Manager driver implements an interface for allocating and accessing items in the memory area shared among all of the processors. Signed-off-by: Ramon Fried <ramon.fried@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
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6 changed files with 145 additions and 0 deletions
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@ -98,6 +98,7 @@ obj-y += pwm/
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obj-y += reset/
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obj-y += input/
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# SOC specific infrastructure drivers.
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obj-y += smem/
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obj-y += soc/
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obj-$(CONFIG_REMOTEPROC) += remoteproc/
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obj-y += thermal/
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2
drivers/smem/Kconfig
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2
drivers/smem/Kconfig
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@ -0,0 +1,2 @@
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menuconfig SMEM
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bool "SMEM (Shared Memory mamanger) support"
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5
drivers/smem/Makefile
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5
drivers/smem/Makefile
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# SPDX-License-Identifier: GPL-2.0+
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#
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# Makefile for the U-Boot SMEM interface drivers
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obj-$(CONFIG_SMEM) += smem-uclass.o
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45
drivers/smem/smem-uclass.c
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45
drivers/smem/smem-uclass.c
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2018 Ramon Fried <ramon.fried@gmail.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <smem.h>
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int smem_alloc(struct udevice *dev, unsigned int host,
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unsigned int item, size_t size)
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{
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struct smem_ops *ops = smem_get_ops(dev);
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if (!ops->alloc)
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return -ENOSYS;
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return ops->alloc(host, item, size);
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}
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void *smem_get(struct udevice *dev, unsigned int host,
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unsigned int item, size_t *size)
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{
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struct smem_ops *ops = smem_get_ops(dev);
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if (!ops->get)
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return NULL;
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return ops->get(host, item, size);
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}
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int smem_get_free_space(struct udevice *dev, unsigned int host)
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{
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struct smem_ops *ops = smem_get_ops(dev);
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if (!ops->get_free_space)
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return -ENOSYS;
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return ops->get_free_space(host);
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}
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UCLASS_DRIVER(smem) = {
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.id = UCLASS_SMEM,
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.name = "smem",
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};
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@ -74,6 +74,7 @@ enum uclass_id {
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UCLASS_RTC, /* Real time clock device */
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UCLASS_SCSI, /* SCSI device */
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UCLASS_SERIAL, /* Serial UART */
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UCLASS_SMEM, /* Shared memory interface */
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UCLASS_SPI, /* SPI bus */
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UCLASS_SPMI, /* System Power Management Interface bus */
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UCLASS_SPI_FLASH, /* SPI flash */
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91
include/smem.h
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include/smem.h
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* The shared memory system is an allocate-only heap structure that
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* consists of one of more memory areas that can be accessed by the processors
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* in the SoC.
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*
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* Allocation can be done globally for all processors or to an individual processor.
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* This is controlled by the @host parameter.
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*
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* Allocation and management of heap can be implemented in various ways,
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* The @item parameter should be used as an index/hash to the memory region.
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*
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* Copyright (c) 2018 Ramon Fried <ramon.fried@gmail.com>
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*/
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#ifndef _smemh_
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#define _smemh_
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/* struct smem_ops: Operations for the SMEM uclass */
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struct smem_ops {
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/**
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* alloc() - allocate space for a smem item
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*
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* @host: remote processor id, or -1 for all processors.
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* @item: smem item handle
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* @size: number of bytes to be allocated
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* @return 0 if OK, -ve on error
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*/
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int (*alloc)(unsigned int host,
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unsigned int item, size_t size);
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/**
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* get() - Resolve ptr of size of a smem item
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*
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* @host: the remote processor, of -1 for all processors.
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* @item: smem item handle
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* @size: pointer to be filled out with the size of the item
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* @return pointer on success, NULL on error
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*/
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void *(*get)(unsigned int host,
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unsigned int item, size_t *size);
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/**
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* get_free_space() - Get free space in smem in bytes
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*
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* @host: the remote processor identifying a partition, or -1
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* for all processors.
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* @return free space, -ve on error
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*/
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int (*get_free_space)(unsigned int host);
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};
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#define smem_get_ops(dev) ((struct smem_ops *)(dev)->driver->ops)
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/**
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* smem_alloc() - allocate space for a smem item
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* @host: remote processor id, or -1
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* @item: smem item handle
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* @size: number of bytes to be allocated
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* @return 0 if OK, -ve on error
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*
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* Allocate space for a given smem item of size @size, given that the item is
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* not yet allocated.
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*/
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int smem_alloc(struct udevice *dev, unsigned int host, unsigned int item, size_t size);
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/**
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* smem_get() - resolve ptr of size of a smem item
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* @host: the remote processor, or -1 for all processors.
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* @item: smem item handle
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* @size: pointer to be filled out with size of the item
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* @return pointer on success, NULL on error
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*
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* Looks up smem item and returns pointer to it. Size of smem
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* item is returned in @size.
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*/
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void *smem_get(struct udevice *dev, unsigned int host, unsigned int item, size_t *size);
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/**
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* smem_get_free_space() - retrieve amount of free space in a partition
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* @host: the remote processor identifying a partition, or -1
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* for all processors.
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* @return size in bytes, -ve on error
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*
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* To be used by smem clients as a quick way to determine if any new
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* allocations has been made.
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*/
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int smem_get_free_space(struct udevice *dev, unsigned int host);
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#endif /* _smem_h_ */
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