![Bjorn Andersson](/assets/img/avatar_default.png)
Mapping the SMEM region as write combine makes the contiguous writes in SMD perform better and also allows us to do unaligned read and writes on ARM64. Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Andy Gross <andy.gross@linaro.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>
795 lines
20 KiB
C
795 lines
20 KiB
C
/*
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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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__le32 command;
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__le32 status;
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__le32 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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__le32 allocated;
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__le32 offset;
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__le32 size;
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__le32 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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__le32 version[32];
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__le32 initialized;
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__le32 free_offset;
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__le32 available;
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__le32 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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__le32 offset;
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__le32 size;
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__le32 flags;
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__le16 host0;
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__le16 host1;
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__le32 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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u8 magic[4];
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__le32 version;
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__le32 num_entries;
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__le32 reserved[5];
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struct smem_ptable_entry entry[];
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};
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static const u8 SMEM_PTABLE_MAGIC[] = { 0x24, 0x54, 0x4f, 0x43 }; /* "$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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u8 magic[4];
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__le16 host0;
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__le16 host1;
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__le32 size;
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__le32 offset_free_uncached;
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__le32 offset_free_cached;
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__le32 reserved[3];
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};
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static const u8 SMEM_PART_MAGIC[] = { 0x24, 0x50, 0x52, 0x54 };
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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; /* bytes are the same so no swapping needed */
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__le16 item;
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__le32 size; /* includes padding bytes */
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__le16 padding_data;
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__le16 padding_hdr;
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__le32 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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static struct smem_private_entry *
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phdr_to_last_private_entry(struct smem_partition_header *phdr)
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{
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void *p = phdr;
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return p + le32_to_cpu(phdr->offset_free_uncached);
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}
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static void *phdr_to_first_cached_entry(struct smem_partition_header *phdr)
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{
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void *p = phdr;
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return p + le32_to_cpu(phdr->offset_free_cached);
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}
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static struct smem_private_entry *
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phdr_to_first_private_entry(struct smem_partition_header *phdr)
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{
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void *p = phdr;
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return p + sizeof(*phdr);
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}
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static struct smem_private_entry *
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private_entry_next(struct smem_private_entry *e)
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{
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void *p = e;
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return p + sizeof(*e) + le16_to_cpu(e->padding_hdr) +
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le32_to_cpu(e->size);
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}
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static void *entry_to_item(struct smem_private_entry *e)
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{
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void *p = e;
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return p + sizeof(*e) + le16_to_cpu(e->padding_hdr);
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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, *end;
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size_t alloc_size;
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void *cached;
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phdr = smem->partitions[host];
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hdr = phdr_to_first_private_entry(phdr);
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end = phdr_to_last_private_entry(phdr);
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cached = phdr_to_first_cached_entry(phdr);
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while (hdr < end) {
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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 (le16_to_cpu(hdr->item) == item)
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return -EEXIST;
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hdr = private_entry_next(hdr);
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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 ((void *)hdr + alloc_size >= 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->canary = SMEM_PRIVATE_CANARY;
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hdr->item = cpu_to_le16(item);
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hdr->size = cpu_to_le32(ALIGN(size, 8));
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hdr->padding_data = cpu_to_le16(le32_to_cpu(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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le32_add_cpu(&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 > le32_to_cpu(header->available)))
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return -ENOMEM;
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entry->offset = header->free_offset;
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entry->size = cpu_to_le32(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 = cpu_to_le32(1);
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le32_add_cpu(&header->free_offset, size);
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le32_add_cpu(&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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if (host < SMEM_HOST_COUNT && __smem->partitions[host])
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ret = qcom_smem_alloc_private(__smem, host, item, size);
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else
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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 void *qcom_smem_get_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_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 ERR_PTR(-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 ERR_PTR(-ENXIO);
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aux_base = le32_to_cpu(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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if (size != NULL)
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*size = le32_to_cpu(entry->size);
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return area->virt_base + le32_to_cpu(entry->offset);
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}
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}
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return ERR_PTR(-ENOENT);
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}
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static void *qcom_smem_get_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 *e, *end;
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phdr = smem->partitions[host];
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e = phdr_to_first_private_entry(phdr);
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end = phdr_to_last_private_entry(phdr);
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while (e < end) {
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if (e->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 ERR_PTR(-EINVAL);
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}
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if (le16_to_cpu(e->item) == item) {
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if (size != NULL)
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*size = le32_to_cpu(e->size) -
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le16_to_cpu(e->padding_data);
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return entry_to_item(e);
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}
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e = private_entry_next(e);
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}
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return ERR_PTR(-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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* @size: pointer to be filled out with size of the item
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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 *qcom_smem_get(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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void *ptr = ERR_PTR(-EPROBE_DEFER);
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if (!__smem)
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return ptr;
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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 ERR_PTR(ret);
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if (host < SMEM_HOST_COUNT && __smem->partitions[host])
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ptr = qcom_smem_get_private(__smem, host, item, size);
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else
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ptr = qcom_smem_get_global(__smem, item, size);
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hwspin_unlock_irqrestore(__smem->hwlock, &flags);
|
|
|
|
return ptr;
|
|
|
|
}
|
|
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 = le32_to_cpu(phdr->offset_free_cached) -
|
|
le32_to_cpu(phdr->offset_free_uncached);
|
|
} else {
|
|
header = __smem->regions[0].virt_base;
|
|
ret = le32_to_cpu(header->available);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(qcom_smem_get_free_space);
|
|
|
|
static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
|
|
{
|
|
__le32 *versions;
|
|
size_t size;
|
|
|
|
versions = qcom_smem_get_global(smem, SMEM_ITEM_VERSION, &size);
|
|
if (IS_ERR(versions)) {
|
|
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 le32_to_cpu(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;
|
|
u32 version, host0, host1;
|
|
int i;
|
|
|
|
ptable = smem->regions[0].virt_base + smem->regions[0].size - SZ_4K;
|
|
if (memcmp(ptable->magic, SMEM_PTABLE_MAGIC, sizeof(ptable->magic)))
|
|
return 0;
|
|
|
|
version = le32_to_cpu(ptable->version);
|
|
if (version != 1) {
|
|
dev_err(smem->dev,
|
|
"Unsupported partition header version %d\n", version);
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < le32_to_cpu(ptable->num_entries); i++) {
|
|
entry = &ptable->entry[i];
|
|
host0 = le16_to_cpu(entry->host0);
|
|
host1 = le16_to_cpu(entry->host1);
|
|
|
|
if (host0 != local_host && host1 != local_host)
|
|
continue;
|
|
|
|
if (!le32_to_cpu(entry->offset))
|
|
continue;
|
|
|
|
if (!le32_to_cpu(entry->size))
|
|
continue;
|
|
|
|
if (host0 == local_host)
|
|
remote_host = host1;
|
|
else
|
|
remote_host = 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 + le32_to_cpu(entry->offset);
|
|
host0 = le16_to_cpu(header->host0);
|
|
host1 = le16_to_cpu(header->host1);
|
|
|
|
if (memcmp(header->magic, SMEM_PART_MAGIC,
|
|
sizeof(header->magic))) {
|
|
dev_err(smem->dev,
|
|
"Partition %d has invalid magic\n", i);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (host0 != local_host && host1 != local_host) {
|
|
dev_err(smem->dev,
|
|
"Partition %d hosts are invalid\n", i);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (host0 != remote_host && 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 (le32_to_cpu(header->offset_free_uncached) > le32_to_cpu(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_map_memory(struct qcom_smem *smem, struct device *dev,
|
|
const char *name, int i)
|
|
{
|
|
struct device_node *np;
|
|
struct resource r;
|
|
int ret;
|
|
|
|
np = of_parse_phandle(dev->of_node, name, 0);
|
|
if (!np) {
|
|
dev_err(dev, "No %s specified\n", name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = of_address_to_resource(np, 0, &r);
|
|
of_node_put(np);
|
|
if (ret)
|
|
return ret;
|
|
|
|
smem->regions[i].aux_base = (u32)r.start;
|
|
smem->regions[i].size = resource_size(&r);
|
|
smem->regions[i].virt_base = devm_ioremap_wc(dev, r.start, resource_size(&r));
|
|
if (!smem->regions[i].virt_base)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_smem_probe(struct platform_device *pdev)
|
|
{
|
|
struct smem_header *header;
|
|
struct qcom_smem *smem;
|
|
size_t array_size;
|
|
int num_regions;
|
|
int hwlock_id;
|
|
u32 version;
|
|
int ret;
|
|
|
|
num_regions = 1;
|
|
if (of_find_property(pdev->dev.of_node, "qcom,rpm-msg-ram", NULL))
|
|
num_regions++;
|
|
|
|
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;
|
|
|
|
ret = qcom_smem_map_memory(smem, &pdev->dev, "memory-region", 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (num_regions > 1 && (ret = qcom_smem_map_memory(smem, &pdev->dev,
|
|
"qcom,rpm-msg-ram", 1)))
|
|
return ret;
|
|
|
|
header = smem->regions[0].virt_base;
|
|
if (le32_to_cpu(header->initialized) != 1 ||
|
|
le32_to_cpu(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)
|
|
{
|
|
hwspin_lock_free(__smem->hwlock);
|
|
__smem = NULL;
|
|
|
|
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");
|