[OpenWrt-Devel] [PATCH 3/5] ipq806x: add SMEM support
Mathieu Olivari
mathieu at codeaurora.org
Fri Aug 14 20:50:42 EDT 2015
2 patches are cherry-picked from the following LKML thread:
*https://lkml.org/lkml/2015/4/11/208
The last patch (036-soc-qcom-add-smem-to-IPQ806x-platforms.patch) is
adding the corresponding DT nodes required for IPQ806x.
Signed-off-by: Mathieu Olivari <mathieu at codeaurora.org>
---
...soc-qcom-Add-device-tree-binding-for-SMEM.patch | 82 ++
...soc-qcom-Add-Shared-Memory-Manager-driver.patch | 841 +++++++++++++++++++++
...-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch | 36 +
...soc-qcom-Add-device-tree-binding-for-SMEM.patch | 82 ++
...soc-qcom-Add-Shared-Memory-Manager-driver.patch | 841 +++++++++++++++++++++
...-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch | 36 +
6 files changed, 1918 insertions(+)
create mode 100644 target/linux/ipq806x/patches-3.18/034-soc-qcom-Add-device-tree-binding-for-SMEM.patch
create mode 100644 target/linux/ipq806x/patches-3.18/035-soc-qcom-Add-Shared-Memory-Manager-driver.patch
create mode 100644 target/linux/ipq806x/patches-3.18/036-ARM-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch
create mode 100644 target/linux/ipq806x/patches-4.1/034-soc-qcom-Add-device-tree-binding-for-SMEM.patch
create mode 100644 target/linux/ipq806x/patches-4.1/035-soc-qcom-Add-Shared-Memory-Manager-driver.patch
create mode 100644 target/linux/ipq806x/patches-4.1/036-ARM-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch
diff --git a/target/linux/ipq806x/patches-3.18/034-soc-qcom-Add-device-tree-binding-for-SMEM.patch b/target/linux/ipq806x/patches-3.18/034-soc-qcom-Add-device-tree-binding-for-SMEM.patch
new file mode 100644
index 0000000..d22db22
--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/034-soc-qcom-Add-device-tree-binding-for-SMEM.patch
@@ -0,0 +1,82 @@
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [v2,1/2] soc: qcom: Add device tree binding for SMEM
+From: Bjorn Andersson <bjorn.andersson at sonymobile.com>
+X-Patchwork-Id: 6202201
+Message-Id: <1428795178-24312-1-git-send-email-bjorn.andersson at sonymobile.com>
+To: Rob Herring <robh+dt at kernel.org>, Pawel Moll <pawel.moll at arm.com>,
+ Mark Rutland <mark.rutland at arm.com>,
+ Ian Campbell <ijc+devicetree at hellion.org.uk>,
+ Kumar Gala <galak at codeaurora.org>, Jeffrey Hugo <jhugo at codeaurora.org>,
+ Andry Gross <agross at codeaurora.org>
+Cc: <devicetree at vger.kernel.org>,
+ linux-arm-msm <linux-arm-msm at vger.kernel.org>,
+ <linux-kernel at vger.kernel.org>
+Date: Sat, 11 Apr 2015 16:32:57 -0700
+
+Add device tree binding documentation for the Qualcom Shared Memory
+manager.
+
+Signed-off-by: Bjorn Andersson <bjorn.andersson at sonymobile.com>
+
+---
+Changes since v1:
+- None
+
+ .../devicetree/bindings/soc/qcom/qcom,smem.txt | 49 ++++++++++++++++++++++
+ 1 file changed, 49 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
+@@ -0,0 +1,49 @@
++Qualcomm Shared Memory binding
++
++This binding describes the Qualcomm Shared Memory, used to share data between
++various subsystems and OSes in Qualcomm platforms.
++
++- compatible:
++ Usage: required
++ Value type: <stringlist>
++ Definition: must be:
++ "qcom,smem"
++
++- memory-region:
++ Usage: required
++ Value type: <prop-encoded-array>
++ Definition: handle to memory reservation for main smem memory region.
++
++- reg:
++ Usage: optional
++ Value type: <prop-encoded-array>
++ Definition: base address and size pair for any additional memory areas
++ of the shared memory.
++
++- hwspinlocks:
++ Usage: required
++ Value type: <prop-encoded-array>
++ Definition: reference to a hwspinlock used to protect allocations from
++ the shared memory
++
++= EXAMPLE
++
++ reserved-memory {
++ #address-cells = <1>;
++ #size-cells = <1>;
++ ranges;
++
++ smem_region: smem at fa00000 {
++ reg = <0xfa00000 0x200000>;
++ no-map;
++ };
++ };
++
++ smem at fa00000 {
++ compatible = "qcom,smem";
++
++ memory-region = <&smem_region>;
++ reg = <0xfc428000 0x4000>;
++
++ hwlocks = <&tcsr_mutex 3>;
++ };
diff --git a/target/linux/ipq806x/patches-3.18/035-soc-qcom-Add-Shared-Memory-Manager-driver.patch b/target/linux/ipq806x/patches-3.18/035-soc-qcom-Add-Shared-Memory-Manager-driver.patch
new file mode 100644
index 0000000..c8cff1a
--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/035-soc-qcom-Add-Shared-Memory-Manager-driver.patch
@@ -0,0 +1,841 @@
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [v2,2/2] soc: qcom: Add Shared Memory Manager driver
+From: Bjorn Andersson <bjorn.andersson at sonymobile.com>
+X-Patchwork-Id: 6202211
+Message-Id: <1428795178-24312-2-git-send-email-bjorn.andersson at sonymobile.com>
+To: Kumar Gala <galak at codeaurora.org>, Andy Gross <agross at codeaurora.org>,
+ David Brown <davidb at codeaurora.org>, Jeffrey Hugo <jhugo at codeaurora.org>
+Cc: <linux-kernel at vger.kernel.org>, <linux-arm-msm at vger.kernel.org>,
+ <linux-soc at vger.kernel.org>
+Date: Sat, 11 Apr 2015 16:32:58 -0700
+
+The Shared Memory Manager driver implements an interface for allocating
+and accessing items in the memory area shared among all of the
+processors in a Qualcomm platform.
+
+Signed-off-by: Bjorn Andersson <bjorn.andersson at sonymobile.com>
+Reviewed-by: Andy Gross <agross at codeaurora.org>
+Tested-by: Andy Gross <agross at codeaurora.org>
+
+---
+Changes since v1:
+- ioremapping the regions nocache
+- improved documentation of the two regions of partitions
+- corrected free space check in private allocator
+
+ drivers/soc/qcom/Kconfig | 7 +
+ drivers/soc/qcom/Makefile | 1 +
+ drivers/soc/qcom/smem.c | 768 ++++++++++++++++++++++++++++++++++++++++++
+ include/linux/soc/qcom/smem.h | 14 +
+ 4 files changed, 790 insertions(+)
+ create mode 100644 drivers/soc/qcom/smem.c
+ create mode 100644 include/linux/soc/qcom/smem.h
+
+--- a/drivers/soc/qcom/Kconfig
++++ b/drivers/soc/qcom/Kconfig
+@@ -9,3 +9,10 @@ config QCOM_GSBI
+ functions for connecting the underlying serial UART, SPI, and I2C
+ devices to the output pins.
+
++config QCOM_SMEM
++ tristate "Qualcomm Shared Memory Manager (SMEM)"
++ depends on ARCH_QCOM
++ help
++ Say y here to enable support for the Qualcomm Shared Memory Manager.
++ The driver provides an interface to items in a heap shared among all
++ processors in a Qualcomm platform.
+--- a/drivers/soc/qcom/Makefile
++++ b/drivers/soc/qcom/Makefile
+@@ -1 +1,2 @@
+ obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
++obj-$(CONFIG_QCOM_SMEM) += smem.o
+--- /dev/null
++++ b/drivers/soc/qcom/smem.c
+@@ -0,0 +1,768 @@
++/*
++ * Copyright (c) 2015, Sony Mobile Communications AB.
++ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 and
++ * only version 2 as published by the Free Software Foundation.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ */
++
++#include <linux/hwspinlock.h>
++#include <linux/io.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/of_address.h>
++#include <linux/platform_device.h>
++#include <linux/slab.h>
++#include <linux/soc/qcom/smem.h>
++
++/*
++ * The Qualcomm shared memory system is a allocate only heap structure that
++ * consists of one of more memory areas that can be accessed by the processors
++ * in the SoC.
++ *
++ * All systems contains a global heap, accessible by all processors in the SoC,
++ * with a table of contents data structure (@smem_header) at the beginning of
++ * the main shared memory block.
++ *
++ * The global header contains metadata for allocations as well as a fixed list
++ * of 512 entries (@smem_global_entry) that can be initialized to reference
++ * parts of the shared memory space.
++ *
++ *
++ * In addition to this global heap a set of "private" heaps can be set up at
++ * boot time with access restrictions so that only certain processor pairs can
++ * access the data.
++ *
++ * These partitions are referenced from an optional partition table
++ * (@smem_ptable), that is found 4kB from the end of the main smem region. The
++ * partition table entries (@smem_ptable_entry) lists the involved processors
++ * (or hosts) and their location in the main shared memory region.
++ *
++ * Each partition starts with a header (@smem_partition_header) that identifies
++ * the partition and holds properties for the two internal memory regions. The
++ * two regions are cached and non-cached memory respectively. Each region
++ * contain a link list of allocation headers (@smem_private_entry) followed by
++ * their data.
++ *
++ * Items in the non-cached region are allocated from the start of the partition
++ * while items in the cached region are allocated from the end. The free area
++ * is hence the region between the cached and non-cached offsets.
++ *
++ *
++ * To synchronize allocations in the shared memory heaps a remote spinlock must
++ * be held - currently lock number 3 of the sfpb or tcsr is used for this on all
++ * platforms.
++ *
++ */
++
++/**
++ * struct smem_proc_comm - proc_comm communication struct (legacy)
++ * @command: current command to be executed
++ * @status: status of the currently requested command
++ * @params: parameters to the command
++ */
++struct smem_proc_comm {
++ u32 command;
++ u32 status;
++ u32 params[2];
++};
++
++/**
++ * struct smem_global_entry - entry to reference smem items on the heap
++ * @allocated: boolean to indicate if this entry is used
++ * @offset: offset to the allocated space
++ * @size: size of the allocated space, 8 byte aligned
++ * @aux_base: base address for the memory region used by this unit, or 0 for
++ * the default region. bits 0,1 are reserved
++ */
++struct smem_global_entry {
++ u32 allocated;
++ u32 offset;
++ u32 size;
++ u32 aux_base; /* bits 1:0 reserved */
++};
++#define AUX_BASE_MASK 0xfffffffc
++
++/**
++ * struct smem_header - header found in beginning of primary smem region
++ * @proc_comm: proc_comm communication interface (legacy)
++ * @version: array of versions for the various subsystems
++ * @initialized: boolean to indicate that smem is initialized
++ * @free_offset: index of the first unallocated byte in smem
++ * @available: number of bytes available for allocation
++ * @reserved: reserved field, must be 0
++ * toc: array of references to items
++ */
++struct smem_header {
++ struct smem_proc_comm proc_comm[4];
++ u32 version[32];
++ u32 initialized;
++ u32 free_offset;
++ u32 available;
++ u32 reserved;
++ struct smem_global_entry toc[];
++};
++
++/**
++ * struct smem_ptable_entry - one entry in the @smem_ptable list
++ * @offset: offset, within the main shared memory region, of the partition
++ * @size: size of the partition
++ * @flags: flags for the partition (currently unused)
++ * @host0: first processor/host with access to this partition
++ * @host1: second processor/host with access to this partition
++ * @reserved: reserved entries for later use
++ */
++struct smem_ptable_entry {
++ u32 offset;
++ u32 size;
++ u32 flags;
++ u16 host0;
++ u16 host1;
++ u32 reserved[8];
++};
++
++/**
++ * struct smem_ptable - partition table for the private partitions
++ * @magic: magic number, must be SMEM_PTABLE_MAGIC
++ * @version: version of the partition table
++ * @num_entries: number of partitions in the table
++ * @reserved: for now reserved entries
++ * @entry: list of @smem_ptable_entry for the @num_entries partitions
++ */
++struct smem_ptable {
++ u32 magic;
++ u32 version;
++ u32 num_entries;
++ u32 reserved[5];
++ struct smem_ptable_entry entry[];
++};
++#define SMEM_PTABLE_MAGIC 0x434f5424 /* "$TOC" */
++
++/**
++ * struct smem_partition_header - header of the partitions
++ * @magic: magic number, must be SMEM_PART_MAGIC
++ * @host0: first processor/host with access to this partition
++ * @host1: second processor/host with access to this partition
++ * @size: size of the partition
++ * @offset_free_uncached: offset to the first free byte of uncached memory in
++ * this partition
++ * @offset_free_cached: offset to the first free byte of cached memory in this
++ * partition
++ * @reserved: for now reserved entries
++ */
++struct smem_partition_header {
++ u32 magic;
++ u16 host0;
++ u16 host1;
++ u32 size;
++ u32 offset_free_uncached;
++ u32 offset_free_cached;
++ u32 reserved[3];
++};
++#define SMEM_PART_MAGIC 0x54525024 /* "$PRT" */
++
++/**
++ * struct smem_private_entry - header of each item in the private partition
++ * @canary: magic number, must be SMEM_PRIVATE_CANARY
++ * @item: identifying number of the smem item
++ * @size: size of the data, including padding bytes
++ * @padding_data: number of bytes of padding of data
++ * @padding_hdr: number of bytes of padding between the header and the data
++ * @reserved: for now reserved entry
++ */
++struct smem_private_entry {
++ u16 canary;
++ u16 item;
++ u32 size; /* includes padding bytes */
++ u16 padding_data;
++ u16 padding_hdr;
++ u32 reserved;
++};
++#define SMEM_PRIVATE_CANARY 0xa5a5
++
++/*
++ * Item 3 of the global heap contains an array of versions for the various
++ * software components in the SoC. We verify that the boot loader version is
++ * what the expected version (SMEM_EXPECTED_VERSION) as a sanity check.
++ */
++#define SMEM_ITEM_VERSION 3
++#define SMEM_MASTER_SBL_VERSION_INDEX 7
++#define SMEM_EXPECTED_VERSION 11
++
++/*
++ * The first 8 items are only to be allocated by the boot loader while
++ * initializing the heap.
++ */
++#define SMEM_ITEM_LAST_FIXED 8
++
++/* Highest accepted item number, for both global and private heaps */
++#define SMEM_ITEM_LAST 512
++
++/* Processor/host identifier for the application processor */
++#define SMEM_HOST_APPS 0
++
++/* Max number of processors/hosts in a system */
++#define SMEM_HOST_COUNT 7
++
++/**
++ * struct smem_region - representation of a chunk of memory used for smem
++ * @aux_base: identifier of aux_mem base
++ * @virt_base: virtual base address of memory with this aux_mem identifier
++ * @size: size of the memory region
++ */
++struct smem_region {
++ u32 aux_base;
++ void __iomem *virt_base;
++ size_t size;
++};
++
++/**
++ * struct qcom_smem - device data for the smem device
++ * @dev: device pointer
++ * @hwlock: reference to a hwspinlock
++ * @partitions: list of pointers to partitions affecting the current
++ * processor/host
++ * @num_regions: number of @regions
++ * @regions: list of the memory regions defining the shared memory
++ */
++struct qcom_smem {
++ struct device *dev;
++
++ struct hwspinlock *hwlock;
++
++ struct smem_partition_header *partitions[SMEM_HOST_COUNT];
++
++ unsigned num_regions;
++ struct smem_region regions[0];
++};
++
++/* Pointer to the one and only smem handle */
++static struct qcom_smem *__smem;
++
++/* Timeout (ms) for the trylock of remote spinlocks */
++#define HWSPINLOCK_TIMEOUT 1000
++
++static int qcom_smem_alloc_private(struct qcom_smem *smem,
++ unsigned host,
++ unsigned item,
++ size_t size)
++{
++ struct smem_partition_header *phdr;
++ struct smem_private_entry *hdr;
++ size_t alloc_size;
++ void *p;
++
++ /* We're not going to find it if there's no matching partition */
++ if (host >= SMEM_HOST_COUNT || !smem->partitions[host])
++ return -ENOENT;
++
++ phdr = smem->partitions[host];
++
++ p = (void *)phdr + sizeof(*phdr);
++ while (p < (void *)phdr + phdr->offset_free_uncached) {
++ hdr = p;
++
++ if (hdr->canary != SMEM_PRIVATE_CANARY) {
++ dev_err(smem->dev,
++ "Found invalid canary in host %d partition\n",
++ host);
++ return -EINVAL;
++ }
++
++ if (hdr->item == item)
++ return -EEXIST;
++
++ p += sizeof(*hdr) + hdr->padding_hdr + hdr->size;
++ }
++
++ /* Check that we don't grow into the cached region */
++ alloc_size = sizeof(*hdr) + ALIGN(size, 8);
++ if (p + alloc_size >= (void *)phdr + phdr->offset_free_cached) {
++ dev_err(smem->dev, "Out of memory\n");
++ return -ENOSPC;
++ }
++
++ hdr = p;
++ hdr->canary = SMEM_PRIVATE_CANARY;
++ hdr->item = item;
++ hdr->size = ALIGN(size, 8);
++ hdr->padding_data = hdr->size - size;
++ hdr->padding_hdr = 0;
++
++ /*
++ * Ensure the header is written before we advance the free offset, so
++ * that remote processors that does not take the remote spinlock still
++ * gets a consistent view of the linked list.
++ */
++ wmb();
++ phdr->offset_free_uncached += alloc_size;
++
++ return 0;
++}
++
++static int qcom_smem_alloc_global(struct qcom_smem *smem,
++ unsigned item,
++ size_t size)
++{
++ struct smem_header *header;
++ struct smem_global_entry *entry;
++
++ if (WARN_ON(item >= SMEM_ITEM_LAST))
++ return -EINVAL;
++
++ header = smem->regions[0].virt_base;
++ entry = &header->toc[item];
++ if (entry->allocated)
++ return -EEXIST;
++
++ size = ALIGN(size, 8);
++ if (WARN_ON(size > header->available))
++ return -ENOMEM;
++
++ entry->offset = header->free_offset;
++ entry->size = size;
++
++ /*
++ * Ensure the header is consistent before we mark the item allocated,
++ * so that remote processors will get a consistent view of the item
++ * even though they do not take the spinlock on read.
++ */
++ wmb();
++ entry->allocated = 1;
++
++ header->free_offset += size;
++ header->available -= size;
++
++ return 0;
++}
++
++/**
++ * qcom_smem_alloc - allocate space for a smem item
++ * @host: remote processor id, or -1
++ * @item: smem item handle
++ * @size: number of bytes to be allocated
++ *
++ * Allocate space for a given smem item of size @size, given that the item is
++ * not yet allocated.
++ */
++int qcom_smem_alloc(unsigned host, unsigned item, size_t size)
++{
++ unsigned long flags;
++ int ret;
++
++ if (!__smem)
++ return -EPROBE_DEFER;
++
++ if (item < SMEM_ITEM_LAST_FIXED) {
++ dev_err(__smem->dev,
++ "Rejecting allocation of static entry %d\n", item);
++ return -EINVAL;
++ }
++
++ ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
++ HWSPINLOCK_TIMEOUT,
++ &flags);
++ if (ret)
++ return ret;
++
++ ret = qcom_smem_alloc_private(__smem, host, item, size);
++ if (ret == -ENOENT)
++ ret = qcom_smem_alloc_global(__smem, item, size);
++
++ hwspin_unlock_irqrestore(__smem->hwlock, &flags);
++
++ return ret;
++}
++EXPORT_SYMBOL(qcom_smem_alloc);
++
++static int qcom_smem_get_global(struct qcom_smem *smem,
++ unsigned item,
++ void **ptr,
++ size_t *size)
++{
++ struct smem_header *header;
++ struct smem_region *area;
++ struct smem_global_entry *entry;
++ u32 aux_base;
++ unsigned i;
++
++ if (WARN_ON(item >= SMEM_ITEM_LAST))
++ return -EINVAL;
++
++ header = smem->regions[0].virt_base;
++ entry = &header->toc[item];
++ if (!entry->allocated)
++ return -ENXIO;
++
++ if (ptr != NULL) {
++ aux_base = entry->aux_base & AUX_BASE_MASK;
++
++ for (i = 0; i < smem->num_regions; i++) {
++ area = &smem->regions[i];
++
++ if (area->aux_base == aux_base || !aux_base) {
++ *ptr = area->virt_base + entry->offset;
++ break;
++ }
++ }
++ }
++ if (size != NULL)
++ *size = entry->size;
++
++ return 0;
++}
++
++static int qcom_smem_get_private(struct qcom_smem *smem,
++ unsigned host,
++ unsigned item,
++ void **ptr,
++ size_t *size)
++{
++ struct smem_partition_header *phdr;
++ struct smem_private_entry *hdr;
++ void *p;
++
++ /* We're not going to find it if there's no matching partition */
++ if (host >= SMEM_HOST_COUNT || !smem->partitions[host])
++ return -ENOENT;
++
++ phdr = smem->partitions[host];
++
++ p = (void *)phdr + sizeof(*phdr);
++ while (p < (void *)phdr + phdr->offset_free_uncached) {
++ hdr = p;
++
++ if (hdr->canary != SMEM_PRIVATE_CANARY) {
++ dev_err(smem->dev,
++ "Found invalid canary in host %d partition\n",
++ host);
++ return -EINVAL;
++ }
++
++ if (hdr->item == item) {
++ if (ptr != NULL)
++ *ptr = p + sizeof(*hdr) + hdr->padding_hdr;
++
++ if (size != NULL)
++ *size = hdr->size - hdr->padding_data;
++
++ return 0;
++ }
++
++ p += sizeof(*hdr) + hdr->padding_hdr + hdr->size;
++ }
++
++ return -ENOENT;
++}
++
++/**
++ * qcom_smem_get - resolve ptr of size of a smem item
++ * @host: the remote processor, or -1
++ * @item: smem item handle
++ * @ptr: pointer to be filled out with address of the item
++ * @size: pointer to be filled out with size of the item
++ *
++ * Looks up pointer and size of a smem item.
++ */
++int qcom_smem_get(unsigned host, unsigned item, void **ptr, size_t *size)
++{
++ unsigned long flags;
++ int ret;
++
++ if (!__smem)
++ return -EPROBE_DEFER;
++
++ ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
++ HWSPINLOCK_TIMEOUT,
++ &flags);
++ if (ret)
++ return ret;
++
++ ret = qcom_smem_get_private(__smem, host, item, ptr, size);
++ if (ret == -ENOENT)
++ ret = qcom_smem_get_global(__smem, item, ptr, size);
++
++ hwspin_unlock_irqrestore(__smem->hwlock, &flags);
++ return ret;
++
++}
++EXPORT_SYMBOL(qcom_smem_get);
++
++/**
++ * qcom_smem_get_free_space - retrieve amont of free space in a partition
++ * @host: the remote processor identifing a partition, or -1
++ *
++ * To be used by smem clients as a quick way to determine if any new
++ * allocations has been made.
++ */
++int qcom_smem_get_free_space(unsigned host)
++{
++ struct smem_partition_header *phdr;
++ struct smem_header *header;
++ unsigned ret;
++
++ if (!__smem)
++ return -EPROBE_DEFER;
++
++ if (host < SMEM_HOST_COUNT && __smem->partitions[host]) {
++ phdr = __smem->partitions[host];
++ ret = phdr->offset_free_uncached;
++ } else {
++ header = __smem->regions[0].virt_base;
++ ret = header->available;
++ }
++
++ return ret;
++}
++EXPORT_SYMBOL(qcom_smem_get_free_space);
++
++static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
++{
++ unsigned *versions;
++ size_t size;
++ int ret;
++
++ ret = qcom_smem_get_global(smem, SMEM_ITEM_VERSION,
++ (void **)&versions, &size);
++ if (ret < 0) {
++ dev_err(smem->dev, "Unable to read the version item\n");
++ return -ENOENT;
++ }
++
++ if (size < sizeof(unsigned) * SMEM_MASTER_SBL_VERSION_INDEX) {
++ dev_err(smem->dev, "Version item is too small\n");
++ return -EINVAL;
++ }
++
++ return versions[SMEM_MASTER_SBL_VERSION_INDEX];
++}
++
++static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
++ unsigned local_host)
++{
++ struct smem_partition_header *header;
++ struct smem_ptable_entry *entry;
++ struct smem_ptable *ptable;
++ unsigned remote_host;
++ int i;
++
++ ptable = smem->regions[0].virt_base + smem->regions[0].size - 4 * 1024;
++ if (ptable->magic != SMEM_PTABLE_MAGIC)
++ return 0;
++
++ if (ptable->version != 1) {
++ dev_err(smem->dev,
++ "Unsupported partition header version %d\n",
++ ptable->version);
++ return -EINVAL;
++ }
++
++ for (i = 0; i < ptable->num_entries; i++) {
++ entry = &ptable->entry[i];
++
++ if (entry->host0 != local_host && entry->host1 != local_host)
++ continue;
++
++ if (!entry->offset)
++ continue;
++
++ if (!entry->size)
++ continue;
++
++ if (entry->host0 == local_host)
++ remote_host = entry->host1;
++ else
++ remote_host = entry->host0;
++
++ if (smem->partitions[remote_host]) {
++ dev_err(smem->dev,
++ "Already found a partition for host %d\n",
++ remote_host);
++ return -EINVAL;
++ }
++
++ header = smem->regions[0].virt_base + entry->offset;
++
++ if (header->magic != SMEM_PART_MAGIC) {
++ dev_err(smem->dev,
++ "Partition %d has invalid magic\n", i);
++ return -EINVAL;
++ }
++
++ if (header->host0 != local_host && header->host1 != local_host) {
++ dev_err(smem->dev,
++ "Partition %d hosts are invalid\n", i);
++ return -EINVAL;
++ }
++
++ if (header->host0 != remote_host && header->host1 != remote_host) {
++ dev_err(smem->dev,
++ "Partition %d hosts are invalid\n", i);
++ return -EINVAL;
++ }
++
++ if (header->size != entry->size) {
++ dev_err(smem->dev,
++ "Partition %d has invalid size\n", i);
++ return -EINVAL;
++ }
++
++ if (header->offset_free_uncached > header->size) {
++ dev_err(smem->dev,
++ "Partition %d has invalid free pointer\n", i);
++ return -EINVAL;
++ }
++
++ smem->partitions[remote_host] = header;
++ }
++
++ return 0;
++}
++
++static int qcom_smem_count_mem_regions(struct platform_device *pdev)
++{
++ struct resource *res;
++ int num_regions = 0;
++ int i;
++
++ for (i = 0; i < pdev->num_resources; i++) {
++ res = &pdev->resource[i];
++
++ if (resource_type(res) == IORESOURCE_MEM)
++ num_regions++;
++ }
++
++ return num_regions;
++}
++
++static int qcom_smem_probe(struct platform_device *pdev)
++{
++ struct smem_header *header;
++ struct device_node *np;
++ struct qcom_smem *smem;
++ struct resource *res;
++ struct resource r;
++ size_t array_size;
++ int num_regions = 0;
++ int hwlock_id;
++ u32 version;
++ int ret;
++ int i;
++
++ num_regions = qcom_smem_count_mem_regions(pdev) + 1;
++
++ array_size = num_regions * sizeof(struct smem_region);
++ smem = devm_kzalloc(&pdev->dev, sizeof(*smem) + array_size, GFP_KERNEL);
++ if (!smem)
++ return -ENOMEM;
++
++ smem->dev = &pdev->dev;
++ smem->num_regions = num_regions;
++
++ np = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);
++ if (!np) {
++ dev_err(&pdev->dev, "No memory-region specified\n");
++ return -EINVAL;
++ }
++
++ ret = of_address_to_resource(np, 0, &r);
++ of_node_put(np);
++ if (ret)
++ return ret;
++
++ smem->regions[0].aux_base = (u32)r.start;
++ smem->regions[0].size = resource_size(&r);
++ smem->regions[0].virt_base = devm_ioremap_nocache(&pdev->dev,
++ r.start,
++ resource_size(&r));
++ if (!smem->regions[0].virt_base)
++ return -ENOMEM;
++
++ for (i = 1; i < num_regions; i++) {
++ res = platform_get_resource(pdev, IORESOURCE_MEM, i - 1);
++
++ smem->regions[i].aux_base = (u32)res->start;
++ smem->regions[i].size = resource_size(res);
++ smem->regions[i].virt_base = devm_ioremap_nocache(&pdev->dev,
++ res->start,
++ resource_size(res));
++ if (!smem->regions[i].virt_base)
++ return -ENOMEM;
++ }
++
++ header = smem->regions[0].virt_base;
++ if (header->initialized != 1 || header->reserved) {
++ dev_err(&pdev->dev, "SMEM is not initilized 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 at sonymobile.com>");
++MODULE_DESCRIPTION("Qualcomm Shared Memory Manager");
++MODULE_LICENSE("GPLv2");
+--- /dev/null
++++ b/include/linux/soc/qcom/smem.h
+@@ -0,0 +1,14 @@
++#ifndef __QCOM_SMEM_H__
++#define __QCOM_SMEM_H__
++
++struct device_node;
++struct qcom_smem;
++
++#define QCOM_SMEM_HOST_ANY -1
++
++int qcom_smem_alloc(unsigned host, unsigned item, size_t size);
++int qcom_smem_get(unsigned host, unsigned item, void **ptr, size_t *size);
++
++int qcom_smem_get_free_space(unsigned host);
++
++#endif
diff --git a/target/linux/ipq806x/patches-3.18/036-ARM-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch b/target/linux/ipq806x/patches-3.18/036-ARM-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch
new file mode 100644
index 0000000..b2b9a74
--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/036-ARM-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch
@@ -0,0 +1,36 @@
+From f212be3a6134db8dd7c5f6f0987536a669401fae Mon Sep 17 00:00:00 2001
+From: Mathieu Olivari <mathieu at codeaurora.org>
+Date: Fri, 14 Aug 2015 11:17:20 -0700
+Subject: [PATCH 2/3] ARM: qcom: add SMEM device node to IPQ806x dts
+
+SMEM is used on IPQ806x to store various board related information such
+as boot device and flash partition layout. We'll declare it as a device
+so we can make use of it thanks to the new SMEM soc driver.
+
+Signed-off-by: Mathieu Olivari <mathieu at codeaurora.org>
+---
+ arch/arm/boot/dts/qcom-ipq8064.dtsi | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+--- a/arch/arm/boot/dts/qcom-ipq8064.dtsi
++++ b/arch/arm/boot/dts/qcom-ipq8064.dtsi
+@@ -54,7 +54,7 @@
+ no-map;
+ };
+
+- smem at 41000000 {
++ smem: smem at 41000000 {
+ reg = <0x41000000 0x200000>;
+ no-map;
+ };
+@@ -304,4 +304,10 @@
+
+ #hwlock-cells = <1>;
+ };
++
++ smem {
++ compatible = "qcom,smem";
++ memory-region = <&smem>;
++ hwlocks = <&sfpb_mutex 3>;
++ };
+ };
diff --git a/target/linux/ipq806x/patches-4.1/034-soc-qcom-Add-device-tree-binding-for-SMEM.patch b/target/linux/ipq806x/patches-4.1/034-soc-qcom-Add-device-tree-binding-for-SMEM.patch
new file mode 100644
index 0000000..d22db22
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.1/034-soc-qcom-Add-device-tree-binding-for-SMEM.patch
@@ -0,0 +1,82 @@
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [v2,1/2] soc: qcom: Add device tree binding for SMEM
+From: Bjorn Andersson <bjorn.andersson at sonymobile.com>
+X-Patchwork-Id: 6202201
+Message-Id: <1428795178-24312-1-git-send-email-bjorn.andersson at sonymobile.com>
+To: Rob Herring <robh+dt at kernel.org>, Pawel Moll <pawel.moll at arm.com>,
+ Mark Rutland <mark.rutland at arm.com>,
+ Ian Campbell <ijc+devicetree at hellion.org.uk>,
+ Kumar Gala <galak at codeaurora.org>, Jeffrey Hugo <jhugo at codeaurora.org>,
+ Andry Gross <agross at codeaurora.org>
+Cc: <devicetree at vger.kernel.org>,
+ linux-arm-msm <linux-arm-msm at vger.kernel.org>,
+ <linux-kernel at vger.kernel.org>
+Date: Sat, 11 Apr 2015 16:32:57 -0700
+
+Add device tree binding documentation for the Qualcom Shared Memory
+manager.
+
+Signed-off-by: Bjorn Andersson <bjorn.andersson at sonymobile.com>
+
+---
+Changes since v1:
+- None
+
+ .../devicetree/bindings/soc/qcom/qcom,smem.txt | 49 ++++++++++++++++++++++
+ 1 file changed, 49 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
+@@ -0,0 +1,49 @@
++Qualcomm Shared Memory binding
++
++This binding describes the Qualcomm Shared Memory, used to share data between
++various subsystems and OSes in Qualcomm platforms.
++
++- compatible:
++ Usage: required
++ Value type: <stringlist>
++ Definition: must be:
++ "qcom,smem"
++
++- memory-region:
++ Usage: required
++ Value type: <prop-encoded-array>
++ Definition: handle to memory reservation for main smem memory region.
++
++- reg:
++ Usage: optional
++ Value type: <prop-encoded-array>
++ Definition: base address and size pair for any additional memory areas
++ of the shared memory.
++
++- hwspinlocks:
++ Usage: required
++ Value type: <prop-encoded-array>
++ Definition: reference to a hwspinlock used to protect allocations from
++ the shared memory
++
++= EXAMPLE
++
++ reserved-memory {
++ #address-cells = <1>;
++ #size-cells = <1>;
++ ranges;
++
++ smem_region: smem at fa00000 {
++ reg = <0xfa00000 0x200000>;
++ no-map;
++ };
++ };
++
++ smem at fa00000 {
++ compatible = "qcom,smem";
++
++ memory-region = <&smem_region>;
++ reg = <0xfc428000 0x4000>;
++
++ hwlocks = <&tcsr_mutex 3>;
++ };
diff --git a/target/linux/ipq806x/patches-4.1/035-soc-qcom-Add-Shared-Memory-Manager-driver.patch b/target/linux/ipq806x/patches-4.1/035-soc-qcom-Add-Shared-Memory-Manager-driver.patch
new file mode 100644
index 0000000..5598da2
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.1/035-soc-qcom-Add-Shared-Memory-Manager-driver.patch
@@ -0,0 +1,841 @@
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [v2,2/2] soc: qcom: Add Shared Memory Manager driver
+From: Bjorn Andersson <bjorn.andersson at sonymobile.com>
+X-Patchwork-Id: 6202211
+Message-Id: <1428795178-24312-2-git-send-email-bjorn.andersson at sonymobile.com>
+To: Kumar Gala <galak at codeaurora.org>, Andy Gross <agross at codeaurora.org>,
+ David Brown <davidb at codeaurora.org>, Jeffrey Hugo <jhugo at codeaurora.org>
+Cc: <linux-kernel at vger.kernel.org>, <linux-arm-msm at vger.kernel.org>,
+ <linux-soc at vger.kernel.org>
+Date: Sat, 11 Apr 2015 16:32:58 -0700
+
+The Shared Memory Manager driver implements an interface for allocating
+and accessing items in the memory area shared among all of the
+processors in a Qualcomm platform.
+
+Signed-off-by: Bjorn Andersson <bjorn.andersson at sonymobile.com>
+Reviewed-by: Andy Gross <agross at codeaurora.org>
+Tested-by: Andy Gross <agross at codeaurora.org>
+
+---
+Changes since v1:
+- ioremapping the regions nocache
+- improved documentation of the two regions of partitions
+- corrected free space check in private allocator
+
+ drivers/soc/qcom/Kconfig | 7 +
+ drivers/soc/qcom/Makefile | 1 +
+ drivers/soc/qcom/smem.c | 768 ++++++++++++++++++++++++++++++++++++++++++
+ include/linux/soc/qcom/smem.h | 14 +
+ 4 files changed, 790 insertions(+)
+ create mode 100644 drivers/soc/qcom/smem.c
+ create mode 100644 include/linux/soc/qcom/smem.h
+
+--- a/drivers/soc/qcom/Kconfig
++++ b/drivers/soc/qcom/Kconfig
+@@ -10,3 +10,10 @@ config QCOM_GSBI
+ functions for connecting the underlying serial UART, SPI, and I2C
+ devices to the output pins.
+
++config QCOM_SMEM
++ tristate "Qualcomm Shared Memory Manager (SMEM)"
++ depends on ARCH_QCOM
++ help
++ Say y here to enable support for the Qualcomm Shared Memory Manager.
++ The driver provides an interface to items in a heap shared among all
++ processors in a Qualcomm platform.
+--- a/drivers/soc/qcom/Makefile
++++ b/drivers/soc/qcom/Makefile
+@@ -1 +1,2 @@
+ obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
++obj-$(CONFIG_QCOM_SMEM) += smem.o
+--- /dev/null
++++ b/drivers/soc/qcom/smem.c
+@@ -0,0 +1,768 @@
++/*
++ * Copyright (c) 2015, Sony Mobile Communications AB.
++ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 and
++ * only version 2 as published by the Free Software Foundation.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ */
++
++#include <linux/hwspinlock.h>
++#include <linux/io.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/of_address.h>
++#include <linux/platform_device.h>
++#include <linux/slab.h>
++#include <linux/soc/qcom/smem.h>
++
++/*
++ * The Qualcomm shared memory system is a allocate only heap structure that
++ * consists of one of more memory areas that can be accessed by the processors
++ * in the SoC.
++ *
++ * All systems contains a global heap, accessible by all processors in the SoC,
++ * with a table of contents data structure (@smem_header) at the beginning of
++ * the main shared memory block.
++ *
++ * The global header contains metadata for allocations as well as a fixed list
++ * of 512 entries (@smem_global_entry) that can be initialized to reference
++ * parts of the shared memory space.
++ *
++ *
++ * In addition to this global heap a set of "private" heaps can be set up at
++ * boot time with access restrictions so that only certain processor pairs can
++ * access the data.
++ *
++ * These partitions are referenced from an optional partition table
++ * (@smem_ptable), that is found 4kB from the end of the main smem region. The
++ * partition table entries (@smem_ptable_entry) lists the involved processors
++ * (or hosts) and their location in the main shared memory region.
++ *
++ * Each partition starts with a header (@smem_partition_header) that identifies
++ * the partition and holds properties for the two internal memory regions. The
++ * two regions are cached and non-cached memory respectively. Each region
++ * contain a link list of allocation headers (@smem_private_entry) followed by
++ * their data.
++ *
++ * Items in the non-cached region are allocated from the start of the partition
++ * while items in the cached region are allocated from the end. The free area
++ * is hence the region between the cached and non-cached offsets.
++ *
++ *
++ * To synchronize allocations in the shared memory heaps a remote spinlock must
++ * be held - currently lock number 3 of the sfpb or tcsr is used for this on all
++ * platforms.
++ *
++ */
++
++/**
++ * struct smem_proc_comm - proc_comm communication struct (legacy)
++ * @command: current command to be executed
++ * @status: status of the currently requested command
++ * @params: parameters to the command
++ */
++struct smem_proc_comm {
++ u32 command;
++ u32 status;
++ u32 params[2];
++};
++
++/**
++ * struct smem_global_entry - entry to reference smem items on the heap
++ * @allocated: boolean to indicate if this entry is used
++ * @offset: offset to the allocated space
++ * @size: size of the allocated space, 8 byte aligned
++ * @aux_base: base address for the memory region used by this unit, or 0 for
++ * the default region. bits 0,1 are reserved
++ */
++struct smem_global_entry {
++ u32 allocated;
++ u32 offset;
++ u32 size;
++ u32 aux_base; /* bits 1:0 reserved */
++};
++#define AUX_BASE_MASK 0xfffffffc
++
++/**
++ * struct smem_header - header found in beginning of primary smem region
++ * @proc_comm: proc_comm communication interface (legacy)
++ * @version: array of versions for the various subsystems
++ * @initialized: boolean to indicate that smem is initialized
++ * @free_offset: index of the first unallocated byte in smem
++ * @available: number of bytes available for allocation
++ * @reserved: reserved field, must be 0
++ * toc: array of references to items
++ */
++struct smem_header {
++ struct smem_proc_comm proc_comm[4];
++ u32 version[32];
++ u32 initialized;
++ u32 free_offset;
++ u32 available;
++ u32 reserved;
++ struct smem_global_entry toc[];
++};
++
++/**
++ * struct smem_ptable_entry - one entry in the @smem_ptable list
++ * @offset: offset, within the main shared memory region, of the partition
++ * @size: size of the partition
++ * @flags: flags for the partition (currently unused)
++ * @host0: first processor/host with access to this partition
++ * @host1: second processor/host with access to this partition
++ * @reserved: reserved entries for later use
++ */
++struct smem_ptable_entry {
++ u32 offset;
++ u32 size;
++ u32 flags;
++ u16 host0;
++ u16 host1;
++ u32 reserved[8];
++};
++
++/**
++ * struct smem_ptable - partition table for the private partitions
++ * @magic: magic number, must be SMEM_PTABLE_MAGIC
++ * @version: version of the partition table
++ * @num_entries: number of partitions in the table
++ * @reserved: for now reserved entries
++ * @entry: list of @smem_ptable_entry for the @num_entries partitions
++ */
++struct smem_ptable {
++ u32 magic;
++ u32 version;
++ u32 num_entries;
++ u32 reserved[5];
++ struct smem_ptable_entry entry[];
++};
++#define SMEM_PTABLE_MAGIC 0x434f5424 /* "$TOC" */
++
++/**
++ * struct smem_partition_header - header of the partitions
++ * @magic: magic number, must be SMEM_PART_MAGIC
++ * @host0: first processor/host with access to this partition
++ * @host1: second processor/host with access to this partition
++ * @size: size of the partition
++ * @offset_free_uncached: offset to the first free byte of uncached memory in
++ * this partition
++ * @offset_free_cached: offset to the first free byte of cached memory in this
++ * partition
++ * @reserved: for now reserved entries
++ */
++struct smem_partition_header {
++ u32 magic;
++ u16 host0;
++ u16 host1;
++ u32 size;
++ u32 offset_free_uncached;
++ u32 offset_free_cached;
++ u32 reserved[3];
++};
++#define SMEM_PART_MAGIC 0x54525024 /* "$PRT" */
++
++/**
++ * struct smem_private_entry - header of each item in the private partition
++ * @canary: magic number, must be SMEM_PRIVATE_CANARY
++ * @item: identifying number of the smem item
++ * @size: size of the data, including padding bytes
++ * @padding_data: number of bytes of padding of data
++ * @padding_hdr: number of bytes of padding between the header and the data
++ * @reserved: for now reserved entry
++ */
++struct smem_private_entry {
++ u16 canary;
++ u16 item;
++ u32 size; /* includes padding bytes */
++ u16 padding_data;
++ u16 padding_hdr;
++ u32 reserved;
++};
++#define SMEM_PRIVATE_CANARY 0xa5a5
++
++/*
++ * Item 3 of the global heap contains an array of versions for the various
++ * software components in the SoC. We verify that the boot loader version is
++ * what the expected version (SMEM_EXPECTED_VERSION) as a sanity check.
++ */
++#define SMEM_ITEM_VERSION 3
++#define SMEM_MASTER_SBL_VERSION_INDEX 7
++#define SMEM_EXPECTED_VERSION 11
++
++/*
++ * The first 8 items are only to be allocated by the boot loader while
++ * initializing the heap.
++ */
++#define SMEM_ITEM_LAST_FIXED 8
++
++/* Highest accepted item number, for both global and private heaps */
++#define SMEM_ITEM_LAST 512
++
++/* Processor/host identifier for the application processor */
++#define SMEM_HOST_APPS 0
++
++/* Max number of processors/hosts in a system */
++#define SMEM_HOST_COUNT 7
++
++/**
++ * struct smem_region - representation of a chunk of memory used for smem
++ * @aux_base: identifier of aux_mem base
++ * @virt_base: virtual base address of memory with this aux_mem identifier
++ * @size: size of the memory region
++ */
++struct smem_region {
++ u32 aux_base;
++ void __iomem *virt_base;
++ size_t size;
++};
++
++/**
++ * struct qcom_smem - device data for the smem device
++ * @dev: device pointer
++ * @hwlock: reference to a hwspinlock
++ * @partitions: list of pointers to partitions affecting the current
++ * processor/host
++ * @num_regions: number of @regions
++ * @regions: list of the memory regions defining the shared memory
++ */
++struct qcom_smem {
++ struct device *dev;
++
++ struct hwspinlock *hwlock;
++
++ struct smem_partition_header *partitions[SMEM_HOST_COUNT];
++
++ unsigned num_regions;
++ struct smem_region regions[0];
++};
++
++/* Pointer to the one and only smem handle */
++static struct qcom_smem *__smem;
++
++/* Timeout (ms) for the trylock of remote spinlocks */
++#define HWSPINLOCK_TIMEOUT 1000
++
++static int qcom_smem_alloc_private(struct qcom_smem *smem,
++ unsigned host,
++ unsigned item,
++ size_t size)
++{
++ struct smem_partition_header *phdr;
++ struct smem_private_entry *hdr;
++ size_t alloc_size;
++ void *p;
++
++ /* We're not going to find it if there's no matching partition */
++ if (host >= SMEM_HOST_COUNT || !smem->partitions[host])
++ return -ENOENT;
++
++ phdr = smem->partitions[host];
++
++ p = (void *)phdr + sizeof(*phdr);
++ while (p < (void *)phdr + phdr->offset_free_uncached) {
++ hdr = p;
++
++ if (hdr->canary != SMEM_PRIVATE_CANARY) {
++ dev_err(smem->dev,
++ "Found invalid canary in host %d partition\n",
++ host);
++ return -EINVAL;
++ }
++
++ if (hdr->item == item)
++ return -EEXIST;
++
++ p += sizeof(*hdr) + hdr->padding_hdr + hdr->size;
++ }
++
++ /* Check that we don't grow into the cached region */
++ alloc_size = sizeof(*hdr) + ALIGN(size, 8);
++ if (p + alloc_size >= (void *)phdr + phdr->offset_free_cached) {
++ dev_err(smem->dev, "Out of memory\n");
++ return -ENOSPC;
++ }
++
++ hdr = p;
++ hdr->canary = SMEM_PRIVATE_CANARY;
++ hdr->item = item;
++ hdr->size = ALIGN(size, 8);
++ hdr->padding_data = hdr->size - size;
++ hdr->padding_hdr = 0;
++
++ /*
++ * Ensure the header is written before we advance the free offset, so
++ * that remote processors that does not take the remote spinlock still
++ * gets a consistent view of the linked list.
++ */
++ wmb();
++ phdr->offset_free_uncached += alloc_size;
++
++ return 0;
++}
++
++static int qcom_smem_alloc_global(struct qcom_smem *smem,
++ unsigned item,
++ size_t size)
++{
++ struct smem_header *header;
++ struct smem_global_entry *entry;
++
++ if (WARN_ON(item >= SMEM_ITEM_LAST))
++ return -EINVAL;
++
++ header = smem->regions[0].virt_base;
++ entry = &header->toc[item];
++ if (entry->allocated)
++ return -EEXIST;
++
++ size = ALIGN(size, 8);
++ if (WARN_ON(size > header->available))
++ return -ENOMEM;
++
++ entry->offset = header->free_offset;
++ entry->size = size;
++
++ /*
++ * Ensure the header is consistent before we mark the item allocated,
++ * so that remote processors will get a consistent view of the item
++ * even though they do not take the spinlock on read.
++ */
++ wmb();
++ entry->allocated = 1;
++
++ header->free_offset += size;
++ header->available -= size;
++
++ return 0;
++}
++
++/**
++ * qcom_smem_alloc - allocate space for a smem item
++ * @host: remote processor id, or -1
++ * @item: smem item handle
++ * @size: number of bytes to be allocated
++ *
++ * Allocate space for a given smem item of size @size, given that the item is
++ * not yet allocated.
++ */
++int qcom_smem_alloc(unsigned host, unsigned item, size_t size)
++{
++ unsigned long flags;
++ int ret;
++
++ if (!__smem)
++ return -EPROBE_DEFER;
++
++ if (item < SMEM_ITEM_LAST_FIXED) {
++ dev_err(__smem->dev,
++ "Rejecting allocation of static entry %d\n", item);
++ return -EINVAL;
++ }
++
++ ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
++ HWSPINLOCK_TIMEOUT,
++ &flags);
++ if (ret)
++ return ret;
++
++ ret = qcom_smem_alloc_private(__smem, host, item, size);
++ if (ret == -ENOENT)
++ ret = qcom_smem_alloc_global(__smem, item, size);
++
++ hwspin_unlock_irqrestore(__smem->hwlock, &flags);
++
++ return ret;
++}
++EXPORT_SYMBOL(qcom_smem_alloc);
++
++static int qcom_smem_get_global(struct qcom_smem *smem,
++ unsigned item,
++ void **ptr,
++ size_t *size)
++{
++ struct smem_header *header;
++ struct smem_region *area;
++ struct smem_global_entry *entry;
++ u32 aux_base;
++ unsigned i;
++
++ if (WARN_ON(item >= SMEM_ITEM_LAST))
++ return -EINVAL;
++
++ header = smem->regions[0].virt_base;
++ entry = &header->toc[item];
++ if (!entry->allocated)
++ return -ENXIO;
++
++ if (ptr != NULL) {
++ aux_base = entry->aux_base & AUX_BASE_MASK;
++
++ for (i = 0; i < smem->num_regions; i++) {
++ area = &smem->regions[i];
++
++ if (area->aux_base == aux_base || !aux_base) {
++ *ptr = area->virt_base + entry->offset;
++ break;
++ }
++ }
++ }
++ if (size != NULL)
++ *size = entry->size;
++
++ return 0;
++}
++
++static int qcom_smem_get_private(struct qcom_smem *smem,
++ unsigned host,
++ unsigned item,
++ void **ptr,
++ size_t *size)
++{
++ struct smem_partition_header *phdr;
++ struct smem_private_entry *hdr;
++ void *p;
++
++ /* We're not going to find it if there's no matching partition */
++ if (host >= SMEM_HOST_COUNT || !smem->partitions[host])
++ return -ENOENT;
++
++ phdr = smem->partitions[host];
++
++ p = (void *)phdr + sizeof(*phdr);
++ while (p < (void *)phdr + phdr->offset_free_uncached) {
++ hdr = p;
++
++ if (hdr->canary != SMEM_PRIVATE_CANARY) {
++ dev_err(smem->dev,
++ "Found invalid canary in host %d partition\n",
++ host);
++ return -EINVAL;
++ }
++
++ if (hdr->item == item) {
++ if (ptr != NULL)
++ *ptr = p + sizeof(*hdr) + hdr->padding_hdr;
++
++ if (size != NULL)
++ *size = hdr->size - hdr->padding_data;
++
++ return 0;
++ }
++
++ p += sizeof(*hdr) + hdr->padding_hdr + hdr->size;
++ }
++
++ return -ENOENT;
++}
++
++/**
++ * qcom_smem_get - resolve ptr of size of a smem item
++ * @host: the remote processor, or -1
++ * @item: smem item handle
++ * @ptr: pointer to be filled out with address of the item
++ * @size: pointer to be filled out with size of the item
++ *
++ * Looks up pointer and size of a smem item.
++ */
++int qcom_smem_get(unsigned host, unsigned item, void **ptr, size_t *size)
++{
++ unsigned long flags;
++ int ret;
++
++ if (!__smem)
++ return -EPROBE_DEFER;
++
++ ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
++ HWSPINLOCK_TIMEOUT,
++ &flags);
++ if (ret)
++ return ret;
++
++ ret = qcom_smem_get_private(__smem, host, item, ptr, size);
++ if (ret == -ENOENT)
++ ret = qcom_smem_get_global(__smem, item, ptr, size);
++
++ hwspin_unlock_irqrestore(__smem->hwlock, &flags);
++ return ret;
++
++}
++EXPORT_SYMBOL(qcom_smem_get);
++
++/**
++ * qcom_smem_get_free_space - retrieve amont of free space in a partition
++ * @host: the remote processor identifing a partition, or -1
++ *
++ * To be used by smem clients as a quick way to determine if any new
++ * allocations has been made.
++ */
++int qcom_smem_get_free_space(unsigned host)
++{
++ struct smem_partition_header *phdr;
++ struct smem_header *header;
++ unsigned ret;
++
++ if (!__smem)
++ return -EPROBE_DEFER;
++
++ if (host < SMEM_HOST_COUNT && __smem->partitions[host]) {
++ phdr = __smem->partitions[host];
++ ret = phdr->offset_free_uncached;
++ } else {
++ header = __smem->regions[0].virt_base;
++ ret = header->available;
++ }
++
++ return ret;
++}
++EXPORT_SYMBOL(qcom_smem_get_free_space);
++
++static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
++{
++ unsigned *versions;
++ size_t size;
++ int ret;
++
++ ret = qcom_smem_get_global(smem, SMEM_ITEM_VERSION,
++ (void **)&versions, &size);
++ if (ret < 0) {
++ dev_err(smem->dev, "Unable to read the version item\n");
++ return -ENOENT;
++ }
++
++ if (size < sizeof(unsigned) * SMEM_MASTER_SBL_VERSION_INDEX) {
++ dev_err(smem->dev, "Version item is too small\n");
++ return -EINVAL;
++ }
++
++ return versions[SMEM_MASTER_SBL_VERSION_INDEX];
++}
++
++static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
++ unsigned local_host)
++{
++ struct smem_partition_header *header;
++ struct smem_ptable_entry *entry;
++ struct smem_ptable *ptable;
++ unsigned remote_host;
++ int i;
++
++ ptable = smem->regions[0].virt_base + smem->regions[0].size - 4 * 1024;
++ if (ptable->magic != SMEM_PTABLE_MAGIC)
++ return 0;
++
++ if (ptable->version != 1) {
++ dev_err(smem->dev,
++ "Unsupported partition header version %d\n",
++ ptable->version);
++ return -EINVAL;
++ }
++
++ for (i = 0; i < ptable->num_entries; i++) {
++ entry = &ptable->entry[i];
++
++ if (entry->host0 != local_host && entry->host1 != local_host)
++ continue;
++
++ if (!entry->offset)
++ continue;
++
++ if (!entry->size)
++ continue;
++
++ if (entry->host0 == local_host)
++ remote_host = entry->host1;
++ else
++ remote_host = entry->host0;
++
++ if (smem->partitions[remote_host]) {
++ dev_err(smem->dev,
++ "Already found a partition for host %d\n",
++ remote_host);
++ return -EINVAL;
++ }
++
++ header = smem->regions[0].virt_base + entry->offset;
++
++ if (header->magic != SMEM_PART_MAGIC) {
++ dev_err(smem->dev,
++ "Partition %d has invalid magic\n", i);
++ return -EINVAL;
++ }
++
++ if (header->host0 != local_host && header->host1 != local_host) {
++ dev_err(smem->dev,
++ "Partition %d hosts are invalid\n", i);
++ return -EINVAL;
++ }
++
++ if (header->host0 != remote_host && header->host1 != remote_host) {
++ dev_err(smem->dev,
++ "Partition %d hosts are invalid\n", i);
++ return -EINVAL;
++ }
++
++ if (header->size != entry->size) {
++ dev_err(smem->dev,
++ "Partition %d has invalid size\n", i);
++ return -EINVAL;
++ }
++
++ if (header->offset_free_uncached > header->size) {
++ dev_err(smem->dev,
++ "Partition %d has invalid free pointer\n", i);
++ return -EINVAL;
++ }
++
++ smem->partitions[remote_host] = header;
++ }
++
++ return 0;
++}
++
++static int qcom_smem_count_mem_regions(struct platform_device *pdev)
++{
++ struct resource *res;
++ int num_regions = 0;
++ int i;
++
++ for (i = 0; i < pdev->num_resources; i++) {
++ res = &pdev->resource[i];
++
++ if (resource_type(res) == IORESOURCE_MEM)
++ num_regions++;
++ }
++
++ return num_regions;
++}
++
++static int qcom_smem_probe(struct platform_device *pdev)
++{
++ struct smem_header *header;
++ struct device_node *np;
++ struct qcom_smem *smem;
++ struct resource *res;
++ struct resource r;
++ size_t array_size;
++ int num_regions = 0;
++ int hwlock_id;
++ u32 version;
++ int ret;
++ int i;
++
++ num_regions = qcom_smem_count_mem_regions(pdev) + 1;
++
++ array_size = num_regions * sizeof(struct smem_region);
++ smem = devm_kzalloc(&pdev->dev, sizeof(*smem) + array_size, GFP_KERNEL);
++ if (!smem)
++ return -ENOMEM;
++
++ smem->dev = &pdev->dev;
++ smem->num_regions = num_regions;
++
++ np = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);
++ if (!np) {
++ dev_err(&pdev->dev, "No memory-region specified\n");
++ return -EINVAL;
++ }
++
++ ret = of_address_to_resource(np, 0, &r);
++ of_node_put(np);
++ if (ret)
++ return ret;
++
++ smem->regions[0].aux_base = (u32)r.start;
++ smem->regions[0].size = resource_size(&r);
++ smem->regions[0].virt_base = devm_ioremap_nocache(&pdev->dev,
++ r.start,
++ resource_size(&r));
++ if (!smem->regions[0].virt_base)
++ return -ENOMEM;
++
++ for (i = 1; i < num_regions; i++) {
++ res = platform_get_resource(pdev, IORESOURCE_MEM, i - 1);
++
++ smem->regions[i].aux_base = (u32)res->start;
++ smem->regions[i].size = resource_size(res);
++ smem->regions[i].virt_base = devm_ioremap_nocache(&pdev->dev,
++ res->start,
++ resource_size(res));
++ if (!smem->regions[i].virt_base)
++ return -ENOMEM;
++ }
++
++ header = smem->regions[0].virt_base;
++ if (header->initialized != 1 || header->reserved) {
++ dev_err(&pdev->dev, "SMEM is not initilized 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 at sonymobile.com>");
++MODULE_DESCRIPTION("Qualcomm Shared Memory Manager");
++MODULE_LICENSE("GPLv2");
+--- /dev/null
++++ b/include/linux/soc/qcom/smem.h
+@@ -0,0 +1,14 @@
++#ifndef __QCOM_SMEM_H__
++#define __QCOM_SMEM_H__
++
++struct device_node;
++struct qcom_smem;
++
++#define QCOM_SMEM_HOST_ANY -1
++
++int qcom_smem_alloc(unsigned host, unsigned item, size_t size);
++int qcom_smem_get(unsigned host, unsigned item, void **ptr, size_t *size);
++
++int qcom_smem_get_free_space(unsigned host);
++
++#endif
diff --git a/target/linux/ipq806x/patches-4.1/036-ARM-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch b/target/linux/ipq806x/patches-4.1/036-ARM-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch
new file mode 100644
index 0000000..b55f174
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.1/036-ARM-qcom-add-SMEM-device-node-to-IPQ806x-dts.patch
@@ -0,0 +1,36 @@
+From f212be3a6134db8dd7c5f6f0987536a669401fae Mon Sep 17 00:00:00 2001
+From: Mathieu Olivari <mathieu at codeaurora.org>
+Date: Fri, 14 Aug 2015 11:17:20 -0700
+Subject: [PATCH 2/3] ARM: qcom: add SMEM device node to IPQ806x dts
+
+SMEM is used on IPQ806x to store various board related information such
+as boot device and flash partition layout. We'll declare it as a device
+so we can make use of it thanks to the new SMEM soc driver.
+
+Signed-off-by: Mathieu Olivari <mathieu at codeaurora.org>
+---
+ arch/arm/boot/dts/qcom-ipq8064.dtsi | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+--- a/arch/arm/boot/dts/qcom-ipq8064.dtsi
++++ b/arch/arm/boot/dts/qcom-ipq8064.dtsi
+@@ -55,7 +55,7 @@
+ no-map;
+ };
+
+- smem at 41000000 {
++ smem: smem at 41000000 {
+ reg = <0x41000000 0x200000>;
+ no-map;
+ };
+@@ -341,4 +341,10 @@
+
+ #hwlock-cells = <1>;
+ };
++
++ smem {
++ compatible = "qcom,smem";
++ memory-region = <&smem>;
++ hwlocks = <&sfpb_mutex 3>;
++ };
+ };
--
2.1.4
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