mirror of https://gitee.com/openkylin/linux.git
soc: qcom: Add Shared Memory Manager driver
The Shared Memory Manager driver implements an interface for allocating and accessing items in the memory area shared among all of the processors in a Qualcomm platform. Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Acked-by: Andy Gross <agross@codeaurora.org> Signed-off-by: Andy Gross <agross@codeaurora.org>
This commit is contained in:
Bjorn Andersson
Andy Gross
parent
d770e558e2
commit
4b638df4c9
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@ -17,3 +17,11 @@ config QCOM_PM
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QCOM Platform specific power driver to manage cores and L2 low power
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modes. It interface with various system drivers to put the cores in
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low power modes.
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config QCOM_SMEM
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tristate "Qualcomm Shared Memory Manager (SMEM)"
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depends on ARCH_QCOM
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help
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Say y here to enable support for the Qualcomm Shared Memory Manager.
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The driver provides an interface to items in a heap shared among all
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processors in a Qualcomm platform.
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@ -1,2 +1,3 @@
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obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
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obj-$(CONFIG_QCOM_PM) += spm.o
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obj-$(CONFIG_QCOM_SMEM) += smem.o
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@ -0,0 +1,775 @@
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/*
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* Copyright (c) 2015, Sony Mobile Communications AB.
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* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/hwspinlock.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/soc/qcom/smem.h>
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/*
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* The Qualcomm shared memory system is a 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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* All systems contains a global heap, accessible by all processors in the SoC,
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* with a table of contents data structure (@smem_header) at the beginning of
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* the main shared memory block.
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*
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* The global header contains meta data for allocations as well as a fixed list
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* of 512 entries (@smem_global_entry) that can be initialized to reference
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* parts of the shared memory space.
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*
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*
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* In addition to this global heap a set of "private" heaps can be set up at
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* boot time with access restrictions so that only certain processor pairs can
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* access the data.
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*
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* These partitions are referenced from an optional partition table
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* (@smem_ptable), that is found 4kB from the end of the main smem region. The
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* partition table entries (@smem_ptable_entry) lists the involved processors
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* (or hosts) and their location in the main shared memory region.
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*
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* Each partition starts with a header (@smem_partition_header) that identifies
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* the partition and holds properties for the two internal memory regions. The
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* two regions are cached and non-cached memory respectively. Each region
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* contain a link list of allocation headers (@smem_private_entry) followed by
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* their data.
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*
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* Items in the non-cached region are allocated from the start of the partition
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* while items in the cached region are allocated from the end. The free area
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* is hence the region between the cached and non-cached offsets.
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*
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*
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* To synchronize allocations in the shared memory heaps a remote spinlock must
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* be held - currently lock number 3 of the sfpb or tcsr is used for this on all
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* platforms.
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*
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*/
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/*
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* Item 3 of the global heap contains an array of versions for the various
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* software components in the SoC. We verify that the boot loader version is
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* what the expected version (SMEM_EXPECTED_VERSION) as a sanity check.
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*/
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#define SMEM_ITEM_VERSION 3
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#define SMEM_MASTER_SBL_VERSION_INDEX 7
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#define SMEM_EXPECTED_VERSION 11
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/*
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* The first 8 items are only to be allocated by the boot loader while
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* initializing the heap.
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*/
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#define SMEM_ITEM_LAST_FIXED 8
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/* Highest accepted item number, for both global and private heaps */
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#define SMEM_ITEM_COUNT 512
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/* Processor/host identifier for the application processor */
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#define SMEM_HOST_APPS 0
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/* Max number of processors/hosts in a system */
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#define SMEM_HOST_COUNT 9
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/**
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* struct smem_proc_comm - proc_comm communication struct (legacy)
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* @command: current command to be executed
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* @status: status of the currently requested command
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* @params: parameters to the command
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*/
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struct smem_proc_comm {
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u32 command;
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u32 status;
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u32 params[2];
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};
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/**
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* struct smem_global_entry - entry to reference smem items on the heap
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* @allocated: boolean to indicate if this entry is used
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* @offset: offset to the allocated space
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* @size: size of the allocated space, 8 byte aligned
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* @aux_base: base address for the memory region used by this unit, or 0 for
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* the default region. bits 0,1 are reserved
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*/
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struct smem_global_entry {
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u32 allocated;
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u32 offset;
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u32 size;
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u32 aux_base; /* bits 1:0 reserved */
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};
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#define AUX_BASE_MASK 0xfffffffc
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/**
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* struct smem_header - header found in beginning of primary smem region
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* @proc_comm: proc_comm communication interface (legacy)
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* @version: array of versions for the various subsystems
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* @initialized: boolean to indicate that smem is initialized
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* @free_offset: index of the first unallocated byte in smem
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* @available: number of bytes available for allocation
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* @reserved: reserved field, must be 0
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* toc: array of references to items
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*/
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struct smem_header {
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struct smem_proc_comm proc_comm[4];
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u32 version[32];
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u32 initialized;
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u32 free_offset;
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u32 available;
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u32 reserved;
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struct smem_global_entry toc[SMEM_ITEM_COUNT];
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};
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/**
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* struct smem_ptable_entry - one entry in the @smem_ptable list
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* @offset: offset, within the main shared memory region, of the partition
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* @size: size of the partition
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* @flags: flags for the partition (currently unused)
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* @host0: first processor/host with access to this partition
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* @host1: second processor/host with access to this partition
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* @reserved: reserved entries for later use
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*/
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struct smem_ptable_entry {
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u32 offset;
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u32 size;
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u32 flags;
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u16 host0;
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u16 host1;
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u32 reserved[8];
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};
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/**
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* struct smem_ptable - partition table for the private partitions
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* @magic: magic number, must be SMEM_PTABLE_MAGIC
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* @version: version of the partition table
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* @num_entries: number of partitions in the table
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* @reserved: for now reserved entries
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* @entry: list of @smem_ptable_entry for the @num_entries partitions
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*/
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struct smem_ptable {
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u32 magic;
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u32 version;
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u32 num_entries;
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u32 reserved[5];
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struct smem_ptable_entry entry[];
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};
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#define SMEM_PTABLE_MAGIC 0x434f5424 /* "$TOC" */
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/**
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* struct smem_partition_header - header of the partitions
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* @magic: magic number, must be SMEM_PART_MAGIC
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* @host0: first processor/host with access to this partition
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* @host1: second processor/host with access to this partition
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* @size: size of the partition
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* @offset_free_uncached: offset to the first free byte of uncached memory in
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* this partition
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* @offset_free_cached: offset to the first free byte of cached memory in this
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* partition
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* @reserved: for now reserved entries
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*/
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struct smem_partition_header {
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u32 magic;
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u16 host0;
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u16 host1;
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u32 size;
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u32 offset_free_uncached;
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u32 offset_free_cached;
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u32 reserved[3];
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};
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#define SMEM_PART_MAGIC 0x54525024 /* "$PRT" */
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/**
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* struct smem_private_entry - header of each item in the private partition
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* @canary: magic number, must be SMEM_PRIVATE_CANARY
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* @item: identifying number of the smem item
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* @size: size of the data, including padding bytes
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* @padding_data: number of bytes of padding of data
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* @padding_hdr: number of bytes of padding between the header and the data
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* @reserved: for now reserved entry
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*/
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struct smem_private_entry {
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u16 canary;
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u16 item;
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u32 size; /* includes padding bytes */
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u16 padding_data;
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u16 padding_hdr;
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u32 reserved;
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};
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#define SMEM_PRIVATE_CANARY 0xa5a5
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/**
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* struct smem_region - representation of a chunk of memory used for smem
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* @aux_base: identifier of aux_mem base
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* @virt_base: virtual base address of memory with this aux_mem identifier
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* @size: size of the memory region
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*/
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struct smem_region {
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u32 aux_base;
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void __iomem *virt_base;
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size_t size;
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};
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/**
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* struct qcom_smem - device data for the smem device
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* @dev: device pointer
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* @hwlock: reference to a hwspinlock
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* @partitions: list of pointers to partitions affecting the current
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* processor/host
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* @num_regions: number of @regions
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* @regions: list of the memory regions defining the shared memory
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*/
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struct qcom_smem {
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struct device *dev;
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struct hwspinlock *hwlock;
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struct smem_partition_header *partitions[SMEM_HOST_COUNT];
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unsigned num_regions;
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struct smem_region regions[0];
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};
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/* Pointer to the one and only smem handle */
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static struct qcom_smem *__smem;
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/* Timeout (ms) for the trylock of remote spinlocks */
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#define HWSPINLOCK_TIMEOUT 1000
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static int qcom_smem_alloc_private(struct qcom_smem *smem,
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unsigned host,
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unsigned item,
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size_t size)
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{
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struct smem_partition_header *phdr;
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struct smem_private_entry *hdr;
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size_t alloc_size;
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void *p;
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/* We're not going to find it if there's no matching partition */
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if (host >= SMEM_HOST_COUNT || !smem->partitions[host])
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return -ENOENT;
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phdr = smem->partitions[host];
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p = (void *)phdr + sizeof(*phdr);
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while (p < (void *)phdr + phdr->offset_free_uncached) {
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hdr = p;
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if (hdr->canary != SMEM_PRIVATE_CANARY) {
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dev_err(smem->dev,
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"Found invalid canary in host %d partition\n",
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host);
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return -EINVAL;
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}
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if (hdr->item == item)
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return -EEXIST;
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p += sizeof(*hdr) + hdr->padding_hdr + hdr->size;
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}
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/* Check that we don't grow into the cached region */
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alloc_size = sizeof(*hdr) + ALIGN(size, 8);
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if (p + alloc_size >= (void *)phdr + phdr->offset_free_cached) {
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dev_err(smem->dev, "Out of memory\n");
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return -ENOSPC;
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}
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hdr = p;
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hdr->canary = SMEM_PRIVATE_CANARY;
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hdr->item = item;
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hdr->size = ALIGN(size, 8);
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hdr->padding_data = hdr->size - size;
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hdr->padding_hdr = 0;
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/*
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* Ensure the header is written before we advance the free offset, so
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* that remote processors that does not take the remote spinlock still
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* gets a consistent view of the linked list.
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*/
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wmb();
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phdr->offset_free_uncached += alloc_size;
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return 0;
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}
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static int qcom_smem_alloc_global(struct qcom_smem *smem,
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unsigned item,
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size_t size)
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{
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struct smem_header *header;
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struct smem_global_entry *entry;
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if (WARN_ON(item >= SMEM_ITEM_COUNT))
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return -EINVAL;
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header = smem->regions[0].virt_base;
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entry = &header->toc[item];
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if (entry->allocated)
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return -EEXIST;
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size = ALIGN(size, 8);
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if (WARN_ON(size > header->available))
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return -ENOMEM;
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entry->offset = header->free_offset;
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entry->size = size;
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/*
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* Ensure the header is consistent before we mark the item allocated,
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* so that remote processors will get a consistent view of the item
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* even though they do not take the spinlock on read.
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*/
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wmb();
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entry->allocated = 1;
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header->free_offset += size;
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header->available -= size;
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return 0;
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}
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/**
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* qcom_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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*
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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 qcom_smem_alloc(unsigned host, unsigned item, size_t size)
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{
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unsigned long flags;
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int ret;
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if (!__smem)
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return -EPROBE_DEFER;
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if (item < SMEM_ITEM_LAST_FIXED) {
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dev_err(__smem->dev,
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"Rejecting allocation of static entry %d\n", item);
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return -EINVAL;
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}
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ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
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HWSPINLOCK_TIMEOUT,
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&flags);
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if (ret)
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return ret;
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ret = qcom_smem_alloc_private(__smem, host, item, size);
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if (ret == -ENOENT)
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ret = qcom_smem_alloc_global(__smem, item, size);
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hwspin_unlock_irqrestore(__smem->hwlock, &flags);
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return ret;
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}
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EXPORT_SYMBOL(qcom_smem_alloc);
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static int qcom_smem_get_global(struct qcom_smem *smem,
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unsigned item,
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void **ptr,
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size_t *size)
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{
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struct smem_header *header;
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struct smem_region *area;
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struct smem_global_entry *entry;
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u32 aux_base;
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unsigned i;
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if (WARN_ON(item >= SMEM_ITEM_COUNT))
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return -EINVAL;
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header = smem->regions[0].virt_base;
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entry = &header->toc[item];
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if (!entry->allocated)
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return -ENXIO;
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if (ptr != NULL) {
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aux_base = entry->aux_base & AUX_BASE_MASK;
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for (i = 0; i < smem->num_regions; i++) {
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area = &smem->regions[i];
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if (area->aux_base == aux_base || !aux_base) {
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*ptr = area->virt_base + entry->offset;
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break;
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}
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}
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}
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if (size != NULL)
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*size = entry->size;
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return 0;
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}
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static int qcom_smem_get_private(struct qcom_smem *smem,
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unsigned host,
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unsigned item,
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void **ptr,
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size_t *size)
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{
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struct smem_partition_header *phdr;
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struct smem_private_entry *hdr;
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void *p;
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/* We're not going to find it if there's no matching partition */
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if (host >= SMEM_HOST_COUNT || !smem->partitions[host])
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return -ENOENT;
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phdr = smem->partitions[host];
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p = (void *)phdr + sizeof(*phdr);
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while (p < (void *)phdr + phdr->offset_free_uncached) {
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hdr = p;
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if (hdr->canary != SMEM_PRIVATE_CANARY) {
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dev_err(smem->dev,
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"Found invalid canary in host %d partition\n",
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host);
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return -EINVAL;
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}
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if (hdr->item == item) {
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if (ptr != NULL)
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*ptr = p + sizeof(*hdr) + hdr->padding_hdr;
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if (size != NULL)
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*size = hdr->size - hdr->padding_data;
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return 0;
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}
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p += sizeof(*hdr) + hdr->padding_hdr + hdr->size;
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}
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return -ENOENT;
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}
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/**
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* qcom_smem_get() - resolve ptr of size of a smem item
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* @host: the remote processor, or -1
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* @item: smem item handle
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* @ptr: pointer to be filled out with address of the item
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* @size: pointer to be filled out with size of the item
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*
|
||||
* Looks up pointer and size of a smem item.
|
||||
*/
|
||||
int qcom_smem_get(unsigned host, unsigned item, void **ptr, size_t *size)
|
||||
{
|
||||
unsigned long flags;
|
||||
int ret;
|
||||
|
||||
if (!__smem)
|
||||
return -EPROBE_DEFER;
|
||||
|
||||
ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
|
||||
HWSPINLOCK_TIMEOUT,
|
||||
&flags);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = qcom_smem_get_private(__smem, host, item, ptr, size);
|
||||
if (ret == -ENOENT)
|
||||
ret = qcom_smem_get_global(__smem, item, ptr, size);
|
||||
|
||||
hwspin_unlock_irqrestore(__smem->hwlock, &flags);
|
||||
return ret;
|
||||
|
||||
}
|
||||
EXPORT_SYMBOL(qcom_smem_get);
|
||||
|
||||
/**
|
||||
* qcom_smem_get_free_space() - retrieve amount of free space in a partition
|
||||
* @host: the remote processor identifying a partition, or -1
|
||||
*
|
||||
* To be used by smem clients as a quick way to determine if any new
|
||||
* allocations has been made.
|
||||
*/
|
||||
int qcom_smem_get_free_space(unsigned host)
|
||||
{
|
||||
struct smem_partition_header *phdr;
|
||||
struct smem_header *header;
|
||||
unsigned ret;
|
||||
|
||||
if (!__smem)
|
||||
return -EPROBE_DEFER;
|
||||
|
||||
if (host < SMEM_HOST_COUNT && __smem->partitions[host]) {
|
||||
phdr = __smem->partitions[host];
|
||||
ret = phdr->offset_free_cached - phdr->offset_free_uncached;
|
||||
} else {
|
||||
header = __smem->regions[0].virt_base;
|
||||
ret = header->available;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(qcom_smem_get_free_space);
|
||||
|
||||
static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
|
||||
{
|
||||
unsigned *versions;
|
||||
size_t size;
|
||||
int ret;
|
||||
|
||||
ret = qcom_smem_get_global(smem, SMEM_ITEM_VERSION,
|
||||
(void **)&versions, &size);
|
||||
if (ret < 0) {
|
||||
dev_err(smem->dev, "Unable to read the version item\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
if (size < sizeof(unsigned) * SMEM_MASTER_SBL_VERSION_INDEX) {
|
||||
dev_err(smem->dev, "Version item is too small\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return versions[SMEM_MASTER_SBL_VERSION_INDEX];
|
||||
}
|
||||
|
||||
static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
|
||||
unsigned local_host)
|
||||
{
|
||||
struct smem_partition_header *header;
|
||||
struct smem_ptable_entry *entry;
|
||||
struct smem_ptable *ptable;
|
||||
unsigned remote_host;
|
||||
int i;
|
||||
|
||||
ptable = smem->regions[0].virt_base + smem->regions[0].size - SZ_4K;
|
||||
if (ptable->magic != SMEM_PTABLE_MAGIC)
|
||||
return 0;
|
||||
|
||||
if (ptable->version != 1) {
|
||||
dev_err(smem->dev,
|
||||
"Unsupported partition header version %d\n",
|
||||
ptable->version);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
for (i = 0; i < ptable->num_entries; i++) {
|
||||
entry = &ptable->entry[i];
|
||||
|
||||
if (entry->host0 != local_host && entry->host1 != local_host)
|
||||
continue;
|
||||
|
||||
if (!entry->offset)
|
||||
continue;
|
||||
|
||||
if (!entry->size)
|
||||
continue;
|
||||
|
||||
if (entry->host0 == local_host)
|
||||
remote_host = entry->host1;
|
||||
else
|
||||
remote_host = entry->host0;
|
||||
|
||||
if (remote_host >= SMEM_HOST_COUNT) {
|
||||
dev_err(smem->dev,
|
||||
"Invalid remote host %d\n",
|
||||
remote_host);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (smem->partitions[remote_host]) {
|
||||
dev_err(smem->dev,
|
||||
"Already found a partition for host %d\n",
|
||||
remote_host);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
header = smem->regions[0].virt_base + entry->offset;
|
||||
|
||||
if (header->magic != SMEM_PART_MAGIC) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d has invalid magic\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (header->host0 != local_host && header->host1 != local_host) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d hosts are invalid\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (header->host0 != remote_host && header->host1 != remote_host) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d hosts are invalid\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (header->size != entry->size) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d has invalid size\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (header->offset_free_uncached > header->size) {
|
||||
dev_err(smem->dev,
|
||||
"Partition %d has invalid free pointer\n", i);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
smem->partitions[remote_host] = header;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int qcom_smem_count_mem_regions(struct platform_device *pdev)
|
||||
{
|
||||
struct resource *res;
|
||||
int num_regions = 0;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < pdev->num_resources; i++) {
|
||||
res = &pdev->resource[i];
|
||||
|
||||
if (resource_type(res) == IORESOURCE_MEM)
|
||||
num_regions++;
|
||||
}
|
||||
|
||||
return num_regions;
|
||||
}
|
||||
|
||||
static int qcom_smem_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct smem_header *header;
|
||||
struct device_node *np;
|
||||
struct qcom_smem *smem;
|
||||
struct resource *res;
|
||||
struct resource r;
|
||||
size_t array_size;
|
||||
int num_regions = 0;
|
||||
int hwlock_id;
|
||||
u32 version;
|
||||
int ret;
|
||||
int i;
|
||||
|
||||
num_regions = qcom_smem_count_mem_regions(pdev) + 1;
|
||||
|
||||
array_size = num_regions * sizeof(struct smem_region);
|
||||
smem = devm_kzalloc(&pdev->dev, sizeof(*smem) + array_size, GFP_KERNEL);
|
||||
if (!smem)
|
||||
return -ENOMEM;
|
||||
|
||||
smem->dev = &pdev->dev;
|
||||
smem->num_regions = num_regions;
|
||||
|
||||
np = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);
|
||||
if (!np) {
|
||||
dev_err(&pdev->dev, "No memory-region specified\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = of_address_to_resource(np, 0, &r);
|
||||
of_node_put(np);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
smem->regions[0].aux_base = (u32)r.start;
|
||||
smem->regions[0].size = resource_size(&r);
|
||||
smem->regions[0].virt_base = devm_ioremap_nocache(&pdev->dev,
|
||||
r.start,
|
||||
resource_size(&r));
|
||||
if (!smem->regions[0].virt_base)
|
||||
return -ENOMEM;
|
||||
|
||||
for (i = 1; i < num_regions; i++) {
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, i - 1);
|
||||
|
||||
smem->regions[i].aux_base = (u32)res->start;
|
||||
smem->regions[i].size = resource_size(res);
|
||||
smem->regions[i].virt_base = devm_ioremap_nocache(&pdev->dev,
|
||||
res->start,
|
||||
resource_size(res));
|
||||
if (!smem->regions[i].virt_base)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
header = smem->regions[0].virt_base;
|
||||
if (header->initialized != 1 || header->reserved) {
|
||||
dev_err(&pdev->dev, "SMEM is not initialized by SBL\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
version = qcom_smem_get_sbl_version(smem);
|
||||
if (version >> 16 != SMEM_EXPECTED_VERSION) {
|
||||
dev_err(&pdev->dev, "Unsupported SMEM version 0x%x\n", version);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = qcom_smem_enumerate_partitions(smem, SMEM_HOST_APPS);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0);
|
||||
if (hwlock_id < 0) {
|
||||
dev_err(&pdev->dev, "failed to retrieve hwlock\n");
|
||||
return hwlock_id;
|
||||
}
|
||||
|
||||
smem->hwlock = hwspin_lock_request_specific(hwlock_id);
|
||||
if (!smem->hwlock)
|
||||
return -ENXIO;
|
||||
|
||||
__smem = smem;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int qcom_smem_remove(struct platform_device *pdev)
|
||||
{
|
||||
__smem = NULL;
|
||||
hwspin_lock_free(__smem->hwlock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id qcom_smem_of_match[] = {
|
||||
{ .compatible = "qcom,smem" },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, qcom_smem_of_match);
|
||||
|
||||
static struct platform_driver qcom_smem_driver = {
|
||||
.probe = qcom_smem_probe,
|
||||
.remove = qcom_smem_remove,
|
||||
.driver = {
|
||||
.name = "qcom-smem",
|
||||
.of_match_table = qcom_smem_of_match,
|
||||
.suppress_bind_attrs = true,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init qcom_smem_init(void)
|
||||
{
|
||||
return platform_driver_register(&qcom_smem_driver);
|
||||
}
|
||||
arch_initcall(qcom_smem_init);
|
||||
|
||||
static void __exit qcom_smem_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&qcom_smem_driver);
|
||||
}
|
||||
module_exit(qcom_smem_exit)
|
||||
|
||||
MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
|
||||
MODULE_DESCRIPTION("Qualcomm Shared Memory Manager");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,11 @@
|
|||
#ifndef __QCOM_SMEM_H__
|
||||
#define __QCOM_SMEM_H__
|
||||
|
||||
#define QCOM_SMEM_HOST_ANY -1
|
||||
|
||||
int qcom_smem_alloc(unsigned host, unsigned item, size_t size);
|
||||
int qcom_smem_get(unsigned host, unsigned item, void **ptr, size_t *size);
|
||||
|
||||
int qcom_smem_get_free_space(unsigned host);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue