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1015 lines
26 KiB
1015 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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|
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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/sizes.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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/* |
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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. The header of |
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* cached items comes after the data. |
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* |
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* Version 12 (SMEM_GLOBAL_PART_VERSION) changes the item alloc/get procedure |
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* for the global heap. A new global partition is created from the global heap |
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* region with partition type (SMEM_GLOBAL_HOST) and the max smem item count is |
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* set by the bootloader. |
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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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/* |
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* The version member of the smem header contains an array of versions for the |
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* various software components in the SoC. We verify that the boot loader |
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* version is a valid version as a sanity check. |
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*/ |
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#define SMEM_MASTER_SBL_VERSION_INDEX 7 |
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#define SMEM_GLOBAL_HEAP_VERSION 11 |
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#define SMEM_GLOBAL_PART_VERSION 12 |
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|
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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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|
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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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|
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/* Processor/host identifier for the application processor */ |
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#define SMEM_HOST_APPS 0 |
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|
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/* Processor/host identifier for the global partition */ |
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#define SMEM_GLOBAL_HOST 0xfffe |
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|
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/* Max number of processors/hosts in a system */ |
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#define SMEM_HOST_COUNT 14 |
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|
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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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/** |
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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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/** |
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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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/** |
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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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* @cacheline: alignment for "cached" entries |
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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 cacheline; |
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__le32 reserved[7]; |
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}; |
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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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|
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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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/** |
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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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/** |
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* struct smem_info - smem region info located after the table of contents |
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* @magic: magic number, must be SMEM_INFO_MAGIC |
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* @size: size of the smem region |
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* @base_addr: base address of the smem region |
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* @reserved: for now reserved entry |
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* @num_items: highest accepted item number |
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*/ |
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struct smem_info { |
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u8 magic[4]; |
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__le32 size; |
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__le32 base_addr; |
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__le32 reserved; |
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__le16 num_items; |
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}; |
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|
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static const u8 SMEM_INFO_MAGIC[] = { 0x53, 0x49, 0x49, 0x49 }; /* SIII */ |
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|
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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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/** |
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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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* @global_partition: pointer to global partition when in use |
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* @global_cacheline: cacheline size for global partition |
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* @partitions: list of pointers to partitions affecting the current |
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* processor/host |
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* @cacheline: list of cacheline sizes for each host |
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* @item_count: max accepted item number |
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* @socinfo: platform device pointer |
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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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|
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struct hwspinlock *hwlock; |
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|
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struct smem_partition_header *global_partition; |
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size_t global_cacheline; |
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struct smem_partition_header *partitions[SMEM_HOST_COUNT]; |
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size_t cacheline[SMEM_HOST_COUNT]; |
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u32 item_count; |
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struct platform_device *socinfo; |
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|
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unsigned num_regions; |
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struct smem_region regions[]; |
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}; |
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|
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static void * |
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phdr_to_last_uncached_entry(struct smem_partition_header *phdr) |
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{ |
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void *p = phdr; |
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|
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return p + le32_to_cpu(phdr->offset_free_uncached); |
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} |
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|
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static struct smem_private_entry * |
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phdr_to_first_cached_entry(struct smem_partition_header *phdr, |
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size_t cacheline) |
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{ |
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void *p = phdr; |
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struct smem_private_entry *e; |
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|
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return p + le32_to_cpu(phdr->size) - ALIGN(sizeof(*e), cacheline); |
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} |
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static void * |
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phdr_to_last_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_uncached_entry(struct smem_partition_header *phdr) |
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{ |
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void *p = phdr; |
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|
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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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uncached_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 struct smem_private_entry * |
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cached_entry_next(struct smem_private_entry *e, size_t cacheline) |
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{ |
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void *p = e; |
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|
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return p - le32_to_cpu(e->size) - ALIGN(sizeof(*e), cacheline); |
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} |
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static void *uncached_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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static void *cached_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 - le32_to_cpu(e->size); |
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} |
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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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|
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/* Timeout (ms) for the trylock of remote spinlocks */ |
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#define HWSPINLOCK_TIMEOUT 1000 |
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|
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static int qcom_smem_alloc_private(struct qcom_smem *smem, |
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struct smem_partition_header *phdr, |
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unsigned item, |
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size_t size) |
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{ |
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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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|
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hdr = phdr_to_first_uncached_entry(phdr); |
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end = phdr_to_last_uncached_entry(phdr); |
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cached = phdr_to_last_cached_entry(phdr); |
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|
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while (hdr < end) { |
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if (hdr->canary != SMEM_PRIVATE_CANARY) |
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goto bad_canary; |
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if (le16_to_cpu(hdr->item) == item) |
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return -EEXIST; |
|
|
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hdr = uncached_entry_next(hdr); |
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} |
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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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|
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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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/* |
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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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|
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return 0; |
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bad_canary: |
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dev_err(smem->dev, "Found invalid canary in hosts %hu:%hu partition\n", |
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le16_to_cpu(phdr->host0), le16_to_cpu(phdr->host1)); |
|
|
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return -EINVAL; |
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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_global_entry *entry; |
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struct smem_header *header; |
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|
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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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|
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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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struct smem_partition_header *phdr; |
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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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if (WARN_ON(item >= __smem->item_count)) |
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return -EINVAL; |
|
|
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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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phdr = __smem->partitions[host]; |
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ret = qcom_smem_alloc_private(__smem, phdr, item, size); |
|
} else if (__smem->global_partition) { |
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phdr = __smem->global_partition; |
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ret = qcom_smem_alloc_private(__smem, phdr, item, size); |
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} else { |
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ret = qcom_smem_alloc_global(__smem, item, size); |
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} |
|
|
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hwspin_unlock_irqrestore(__smem->hwlock, &flags); |
|
|
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return ret; |
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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) |
|
{ |
|
struct smem_header *header; |
|
struct smem_region *region; |
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struct smem_global_entry *entry; |
|
u32 aux_base; |
|
unsigned i; |
|
|
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header = smem->regions[0].virt_base; |
|
entry = &header->toc[item]; |
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if (!entry->allocated) |
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return ERR_PTR(-ENXIO); |
|
|
|
aux_base = le32_to_cpu(entry->aux_base) & AUX_BASE_MASK; |
|
|
|
for (i = 0; i < smem->num_regions; i++) { |
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region = &smem->regions[i]; |
|
|
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if (region->aux_base == aux_base || !aux_base) { |
|
if (size != NULL) |
|
*size = le32_to_cpu(entry->size); |
|
return region->virt_base + le32_to_cpu(entry->offset); |
|
} |
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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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struct smem_partition_header *phdr, |
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size_t cacheline, |
|
unsigned item, |
|
size_t *size) |
|
{ |
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struct smem_private_entry *e, *end; |
|
|
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e = phdr_to_first_uncached_entry(phdr); |
|
end = phdr_to_last_uncached_entry(phdr); |
|
|
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while (e < end) { |
|
if (e->canary != SMEM_PRIVATE_CANARY) |
|
goto invalid_canary; |
|
|
|
if (le16_to_cpu(e->item) == item) { |
|
if (size != NULL) |
|
*size = le32_to_cpu(e->size) - |
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le16_to_cpu(e->padding_data); |
|
|
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return uncached_entry_to_item(e); |
|
} |
|
|
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e = uncached_entry_next(e); |
|
} |
|
|
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/* Item was not found in the uncached list, search the cached list */ |
|
|
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e = phdr_to_first_cached_entry(phdr, cacheline); |
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end = phdr_to_last_cached_entry(phdr); |
|
|
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while (e > end) { |
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if (e->canary != SMEM_PRIVATE_CANARY) |
|
goto invalid_canary; |
|
|
|
if (le16_to_cpu(e->item) == item) { |
|
if (size != NULL) |
|
*size = le32_to_cpu(e->size) - |
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le16_to_cpu(e->padding_data); |
|
|
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return cached_entry_to_item(e); |
|
} |
|
|
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e = cached_entry_next(e, cacheline); |
|
} |
|
|
|
return ERR_PTR(-ENOENT); |
|
|
|
invalid_canary: |
|
dev_err(smem->dev, "Found invalid canary in hosts %hu:%hu partition\n", |
|
le16_to_cpu(phdr->host0), le16_to_cpu(phdr->host1)); |
|
|
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return ERR_PTR(-EINVAL); |
|
} |
|
|
|
/** |
|
* qcom_smem_get() - resolve ptr of size of a smem item |
|
* @host: the remote processor, or -1 |
|
* @item: smem item handle |
|
* @size: pointer to be filled out with size of the item |
|
* |
|
* Looks up smem item and returns pointer to it. Size of smem |
|
* item is returned in @size. |
|
*/ |
|
void *qcom_smem_get(unsigned host, unsigned item, size_t *size) |
|
{ |
|
struct smem_partition_header *phdr; |
|
unsigned long flags; |
|
size_t cacheln; |
|
int ret; |
|
void *ptr = ERR_PTR(-EPROBE_DEFER); |
|
|
|
if (!__smem) |
|
return ptr; |
|
|
|
if (WARN_ON(item >= __smem->item_count)) |
|
return ERR_PTR(-EINVAL); |
|
|
|
ret = hwspin_lock_timeout_irqsave(__smem->hwlock, |
|
HWSPINLOCK_TIMEOUT, |
|
&flags); |
|
if (ret) |
|
return ERR_PTR(ret); |
|
|
|
if (host < SMEM_HOST_COUNT && __smem->partitions[host]) { |
|
phdr = __smem->partitions[host]; |
|
cacheln = __smem->cacheline[host]; |
|
ptr = qcom_smem_get_private(__smem, phdr, cacheln, item, size); |
|
} else if (__smem->global_partition) { |
|
phdr = __smem->global_partition; |
|
cacheln = __smem->global_cacheline; |
|
ptr = qcom_smem_get_private(__smem, phdr, cacheln, item, size); |
|
} else { |
|
ptr = qcom_smem_get_global(__smem, item, size); |
|
} |
|
|
|
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 if (__smem->global_partition) { |
|
phdr = __smem->global_partition; |
|
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); |
|
|
|
/** |
|
* qcom_smem_virt_to_phys() - return the physical address associated |
|
* with an smem item pointer (previously returned by qcom_smem_get() |
|
* @p: the virtual address to convert |
|
* |
|
* Returns 0 if the pointer provided is not within any smem region. |
|
*/ |
|
phys_addr_t qcom_smem_virt_to_phys(void *p) |
|
{ |
|
unsigned i; |
|
|
|
for (i = 0; i < __smem->num_regions; i++) { |
|
struct smem_region *region = &__smem->regions[i]; |
|
|
|
if (p < region->virt_base) |
|
continue; |
|
if (p < region->virt_base + region->size) { |
|
u64 offset = p - region->virt_base; |
|
|
|
return (phys_addr_t)region->aux_base + offset; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(qcom_smem_virt_to_phys); |
|
|
|
static int qcom_smem_get_sbl_version(struct qcom_smem *smem) |
|
{ |
|
struct smem_header *header; |
|
__le32 *versions; |
|
|
|
header = smem->regions[0].virt_base; |
|
versions = header->version; |
|
|
|
return le32_to_cpu(versions[SMEM_MASTER_SBL_VERSION_INDEX]); |
|
} |
|
|
|
static struct smem_ptable *qcom_smem_get_ptable(struct qcom_smem *smem) |
|
{ |
|
struct smem_ptable *ptable; |
|
u32 version; |
|
|
|
ptable = smem->regions[0].virt_base + smem->regions[0].size - SZ_4K; |
|
if (memcmp(ptable->magic, SMEM_PTABLE_MAGIC, sizeof(ptable->magic))) |
|
return ERR_PTR(-ENOENT); |
|
|
|
version = le32_to_cpu(ptable->version); |
|
if (version != 1) { |
|
dev_err(smem->dev, |
|
"Unsupported partition header version %d\n", version); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
return ptable; |
|
} |
|
|
|
static u32 qcom_smem_get_item_count(struct qcom_smem *smem) |
|
{ |
|
struct smem_ptable *ptable; |
|
struct smem_info *info; |
|
|
|
ptable = qcom_smem_get_ptable(smem); |
|
if (IS_ERR_OR_NULL(ptable)) |
|
return SMEM_ITEM_COUNT; |
|
|
|
info = (struct smem_info *)&ptable->entry[ptable->num_entries]; |
|
if (memcmp(info->magic, SMEM_INFO_MAGIC, sizeof(info->magic))) |
|
return SMEM_ITEM_COUNT; |
|
|
|
return le16_to_cpu(info->num_items); |
|
} |
|
|
|
/* |
|
* Validate the partition header for a partition whose partition |
|
* table entry is supplied. Returns a pointer to its header if |
|
* valid, or a null pointer otherwise. |
|
*/ |
|
static struct smem_partition_header * |
|
qcom_smem_partition_header(struct qcom_smem *smem, |
|
struct smem_ptable_entry *entry, u16 host0, u16 host1) |
|
{ |
|
struct smem_partition_header *header; |
|
u32 size; |
|
|
|
header = smem->regions[0].virt_base + le32_to_cpu(entry->offset); |
|
|
|
if (memcmp(header->magic, SMEM_PART_MAGIC, sizeof(header->magic))) { |
|
dev_err(smem->dev, "bad partition magic %4ph\n", header->magic); |
|
return NULL; |
|
} |
|
|
|
if (host0 != le16_to_cpu(header->host0)) { |
|
dev_err(smem->dev, "bad host0 (%hu != %hu)\n", |
|
host0, le16_to_cpu(header->host0)); |
|
return NULL; |
|
} |
|
if (host1 != le16_to_cpu(header->host1)) { |
|
dev_err(smem->dev, "bad host1 (%hu != %hu)\n", |
|
host1, le16_to_cpu(header->host1)); |
|
return NULL; |
|
} |
|
|
|
size = le32_to_cpu(header->size); |
|
if (size != le32_to_cpu(entry->size)) { |
|
dev_err(smem->dev, "bad partition size (%u != %u)\n", |
|
size, le32_to_cpu(entry->size)); |
|
return NULL; |
|
} |
|
|
|
if (le32_to_cpu(header->offset_free_uncached) > size) { |
|
dev_err(smem->dev, "bad partition free uncached (%u > %u)\n", |
|
le32_to_cpu(header->offset_free_uncached), size); |
|
return NULL; |
|
} |
|
|
|
return header; |
|
} |
|
|
|
static int qcom_smem_set_global_partition(struct qcom_smem *smem) |
|
{ |
|
struct smem_partition_header *header; |
|
struct smem_ptable_entry *entry; |
|
struct smem_ptable *ptable; |
|
bool found = false; |
|
int i; |
|
|
|
if (smem->global_partition) { |
|
dev_err(smem->dev, "Already found the global partition\n"); |
|
return -EINVAL; |
|
} |
|
|
|
ptable = qcom_smem_get_ptable(smem); |
|
if (IS_ERR(ptable)) |
|
return PTR_ERR(ptable); |
|
|
|
for (i = 0; i < le32_to_cpu(ptable->num_entries); i++) { |
|
entry = &ptable->entry[i]; |
|
if (!le32_to_cpu(entry->offset)) |
|
continue; |
|
if (!le32_to_cpu(entry->size)) |
|
continue; |
|
|
|
if (le16_to_cpu(entry->host0) != SMEM_GLOBAL_HOST) |
|
continue; |
|
|
|
if (le16_to_cpu(entry->host1) == SMEM_GLOBAL_HOST) { |
|
found = true; |
|
break; |
|
} |
|
} |
|
|
|
if (!found) { |
|
dev_err(smem->dev, "Missing entry for global partition\n"); |
|
return -EINVAL; |
|
} |
|
|
|
header = qcom_smem_partition_header(smem, entry, |
|
SMEM_GLOBAL_HOST, SMEM_GLOBAL_HOST); |
|
if (!header) |
|
return -EINVAL; |
|
|
|
smem->global_partition = header; |
|
smem->global_cacheline = le32_to_cpu(entry->cacheline); |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
qcom_smem_enumerate_partitions(struct qcom_smem *smem, u16 local_host) |
|
{ |
|
struct smem_partition_header *header; |
|
struct smem_ptable_entry *entry; |
|
struct smem_ptable *ptable; |
|
unsigned int remote_host; |
|
u16 host0, host1; |
|
int i; |
|
|
|
ptable = qcom_smem_get_ptable(smem); |
|
if (IS_ERR(ptable)) |
|
return PTR_ERR(ptable); |
|
|
|
for (i = 0; i < le32_to_cpu(ptable->num_entries); i++) { |
|
entry = &ptable->entry[i]; |
|
if (!le32_to_cpu(entry->offset)) |
|
continue; |
|
if (!le32_to_cpu(entry->size)) |
|
continue; |
|
|
|
host0 = le16_to_cpu(entry->host0); |
|
host1 = le16_to_cpu(entry->host1); |
|
if (host0 == local_host) |
|
remote_host = host1; |
|
else if (host1 == local_host) |
|
remote_host = host0; |
|
else |
|
continue; |
|
|
|
if (remote_host >= SMEM_HOST_COUNT) { |
|
dev_err(smem->dev, "bad host %hu\n", remote_host); |
|
return -EINVAL; |
|
} |
|
|
|
if (smem->partitions[remote_host]) { |
|
dev_err(smem->dev, "duplicate host %hu\n", remote_host); |
|
return -EINVAL; |
|
} |
|
|
|
header = qcom_smem_partition_header(smem, entry, host0, host1); |
|
if (!header) |
|
return -EINVAL; |
|
|
|
smem->partitions[remote_host] = header; |
|
smem->cacheline[remote_host] = le32_to_cpu(entry->cacheline); |
|
} |
|
|
|
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; |
|
resource_size_t size; |
|
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; |
|
size = resource_size(&r); |
|
|
|
smem->regions[i].virt_base = devm_ioremap_wc(dev, r.start, size); |
|
if (!smem->regions[i].virt_base) |
|
return -ENOMEM; |
|
smem->regions[i].aux_base = (u32)r.start; |
|
smem->regions[i].size = size; |
|
|
|
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); |
|
switch (version >> 16) { |
|
case SMEM_GLOBAL_PART_VERSION: |
|
ret = qcom_smem_set_global_partition(smem); |
|
if (ret < 0) |
|
return ret; |
|
smem->item_count = qcom_smem_get_item_count(smem); |
|
break; |
|
case SMEM_GLOBAL_HEAP_VERSION: |
|
smem->item_count = SMEM_ITEM_COUNT; |
|
break; |
|
default: |
|
dev_err(&pdev->dev, "Unsupported SMEM version 0x%x\n", version); |
|
return -EINVAL; |
|
} |
|
|
|
BUILD_BUG_ON(SMEM_HOST_APPS >= SMEM_HOST_COUNT); |
|
ret = qcom_smem_enumerate_partitions(smem, SMEM_HOST_APPS); |
|
if (ret < 0 && ret != -ENOENT) |
|
return ret; |
|
|
|
hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0); |
|
if (hwlock_id < 0) { |
|
if (hwlock_id != -EPROBE_DEFER) |
|
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; |
|
|
|
smem->socinfo = platform_device_register_data(&pdev->dev, "qcom-socinfo", |
|
PLATFORM_DEVID_NONE, NULL, |
|
0); |
|
if (IS_ERR(smem->socinfo)) |
|
dev_dbg(&pdev->dev, "failed to register socinfo device\n"); |
|
|
|
return 0; |
|
} |
|
|
|
static int qcom_smem_remove(struct platform_device *pdev) |
|
{ |
|
platform_device_unregister(__smem->socinfo); |
|
|
|
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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Qualcomm Shared Memory Manager"); |
|
MODULE_LICENSE("GPL v2");
|
|
|