leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

soc: qualcomm: Add Shared Memory Manager driver

Browse Source 
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.

Adapted from the Linux driver (4.17)

Changes from the original Linux driver:
* Removed HW spinlock mechanism, which is irrelevant
in U-boot particualar use case, which is just reading from the smem.
* Adapted from Linux driver model to U-Boot's.

Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Ramon Fried 2018-07-02 02:57:56 +03:00 committed by Tom Rini
parent 7b384eccc7
commit 654dd4a84e
6 changed files with 951 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
MAINTAINERS
View File

@ -206,6 +206,7 @@ ARM SNAPDRAGON
M: Ramon Fried <ramon.fried@gmail.com>
S: Maintained
F: arch/arm/mach-snapdragon/
F: drivers/smem/msm_smem.c
ARM STI
M: Patrice Chotard <patrice.chotard@st.com>

2
arch/arm/Kconfig
View File

@ -754,6 +754,8 @@ config ARCH_SNAPDRAGON
select SPMI
select OF_CONTROL
select OF_SEPARATE
select SMEM
select MSM_SMEM
config ARCH_SOCFPGA
bool "Altera SOCFPGA family"

2
drivers/Kconfig
View File

@ -84,6 +84,8 @@ source "drivers/scsi/Kconfig"
source "drivers/serial/Kconfig"
source "drivers/smem/Kconfig"
source "drivers/sound/Kconfig"
source "drivers/spi/Kconfig"

13
drivers/smem/Kconfig
View File

@ -1,2 +1,15 @@
menuconfig SMEM
bool "SMEM (Shared Memory mamanger) support"
if SMEM
config MSM_SMEM
bool "Qualcomm Shared Memory Manager (SMEM)"
depends on DM
depends on ARCH_SNAPDRAGON
help
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.
endif # menu "SMEM Support"

1
drivers/smem/Makefile
View File

@ -3,3 +3,4 @@
# Makefile for the U-Boot SMEM interface drivers
obj-$(CONFIG_SMEM) += smem-uclass.o
obj-$(CONFIG_MSM_SMEM) += msm_smem.o

932
drivers/smem/msm_smem.c Normal file
View File

@ -0,0 +1,932 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015, Sony Mobile Communications AB.
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
* Copyright (c) 2018, Ramon Fried <ramon.fried@gmail.com>
*/
#include <common.h>
#include <errno.h>
#include <dm.h>
#include <dm/of_access.h>
#include <dm/of_addr.h>
#include <asm/io.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <smem.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* The Qualcomm shared memory system is an 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 meta data 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. The header of
* cached items comes after the data.
*
* Version 12 (SMEM_GLOBAL_PART_VERSION) changes the item alloc/get procedure
* for the global heap. A new global partition is created from the global heap
* region with partition type (SMEM_GLOBAL_HOST) and the max smem item count is
* set by the bootloader.
*
*/
/*
* The version member of the smem header contains an array of versions for the
* various software components in the SoC. We verify that the boot loader
* version is a valid version as a sanity check.
*/
#define SMEM_MASTER_SBL_VERSION_INDEX 7
#define SMEM_GLOBAL_HEAP_VERSION 11
#define SMEM_GLOBAL_PART_VERSION 12
/*
* 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_COUNT 512
/* Processor/host identifier for the application processor */
#define SMEM_HOST_APPS 0
/* Processor/host identifier for the global partition */
#define SMEM_GLOBAL_HOST 0xfffe
/* Max number of processors/hosts in a system */
#define SMEM_HOST_COUNT 10
/**
* 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 {
__le32 command;
__le32 status;
__le32 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 {
__le32 allocated;
__le32 offset;
__le32 size;
__le32 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];
__le32 version[32];
__le32 initialized;
__le32 free_offset;
__le32 available;
__le32 reserved;
struct smem_global_entry toc[SMEM_ITEM_COUNT];
};
/**
* 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
* @cacheline: alignment for "cached" entries
* @reserved: reserved entries for later use
*/
struct smem_ptable_entry {
__le32 offset;
__le32 size;
__le32 flags;
__le16 host0;
__le16 host1;
__le32 cacheline;
__le32 reserved[7];
};
/**
* 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 {
u8 magic[4];
__le32 version;
__le32 num_entries;
__le32 reserved[5];
struct smem_ptable_entry entry[];
};
static const u8 SMEM_PTABLE_MAGIC[] = { 0x24, 0x54, 0x4f, 0x43 }; /* "$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 {
u8 magic[4];
__le16 host0;
__le16 host1;
__le32 size;
__le32 offset_free_uncached;
__le32 offset_free_cached;
__le32 reserved[3];
};
static const u8 SMEM_PART_MAGIC[] = { 0x24, 0x50, 0x52, 0x54 };
/**
* 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; /* bytes are the same so no swapping needed */
__le16 item;
__le32 size; /* includes padding bytes */
__le16 padding_data;
__le16 padding_hdr;
__le32 reserved;
};
#define SMEM_PRIVATE_CANARY 0xa5a5
/**
* struct smem_info - smem region info located after the table of contents
* @magic: magic number, must be SMEM_INFO_MAGIC
* @size: size of the smem region
* @base_addr: base address of the smem region
* @reserved: for now reserved entry
* @num_items: highest accepted item number
*/
struct smem_info {
u8 magic[4];
__le32 size;
__le32 base_addr;
__le32 reserved;
__le16 num_items;
};
static const u8 SMEM_INFO_MAGIC[] = { 0x53, 0x49, 0x49, 0x49 }; /* SIII */
/**
* 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
* @global_partition: pointer to global partition when in use
* @global_cacheline: cacheline size for global partition
* @partitions: list of pointers to partitions affecting the current
* processor/host
* @cacheline: list of cacheline sizes for each host
* @item_count: max accepted item number
* @num_regions: number of @regions
* @regions: list of the memory regions defining the shared memory
*/
struct qcom_smem {
struct udevice *dev;
struct smem_partition_header *global_partition;
size_t global_cacheline;
struct smem_partition_header *partitions[SMEM_HOST_COUNT];
size_t cacheline[SMEM_HOST_COUNT];
u32 item_count;
unsigned int num_regions;
struct smem_region regions[0];
};
static struct smem_private_entry *
phdr_to_last_uncached_entry(struct smem_partition_header *phdr)
{
void *p = phdr;
return p + le32_to_cpu(phdr->offset_free_uncached);
}
static void *phdr_to_first_cached_entry(struct smem_partition_header *phdr,
size_t cacheline)
{
void *p = phdr;
return p + le32_to_cpu(phdr->size) - ALIGN(sizeof(*phdr), cacheline);
}
static void *phdr_to_last_cached_entry(struct smem_partition_header *phdr)
{
void *p = phdr;
return p + le32_to_cpu(phdr->offset_free_cached);
}
static struct smem_private_entry *
phdr_to_first_uncached_entry(struct smem_partition_header *phdr)
{
void *p = phdr;
return p + sizeof(*phdr);
}
static struct smem_private_entry *
uncached_entry_next(struct smem_private_entry *e)
{
void *p = e;
return p + sizeof(*e) + le16_to_cpu(e->padding_hdr) +
le32_to_cpu(e->size);
}
static struct smem_private_entry *
cached_entry_next(struct smem_private_entry *e, size_t cacheline)
{
void *p = e;
return p - le32_to_cpu(e->size) - ALIGN(sizeof(*e), cacheline);
}
static void *uncached_entry_to_item(struct smem_private_entry *e)
{
void *p = e;
return p + sizeof(*e) + le16_to_cpu(e->padding_hdr);
}
static void *cached_entry_to_item(struct smem_private_entry *e)
{
void *p = e;
return p - le32_to_cpu(e->size);
}
/* Pointer to the one and only smem handle */
static struct qcom_smem *__smem;
static int qcom_smem_alloc_private(struct qcom_smem *smem,
struct smem_partition_header *phdr,
unsigned int item,
size_t size)
{
struct smem_private_entry *hdr, *end;
size_t alloc_size;
void *cached;
hdr = phdr_to_first_uncached_entry(phdr);
end = phdr_to_last_uncached_entry(phdr);
cached = phdr_to_last_cached_entry(phdr);
while (hdr < end) {
if (hdr->canary != SMEM_PRIVATE_CANARY) {
dev_err(smem->dev,
"Found invalid canary in hosts %d:%d partition\n",
phdr->host0, phdr->host1);
return -EINVAL;
}
if (le16_to_cpu(hdr->item) == item)
return -EEXIST;
hdr = uncached_entry_next(hdr);
}
/* Check that we don't grow into the cached region */
alloc_size = sizeof(*hdr) + ALIGN(size, 8);
if ((void *)hdr + alloc_size >= cached) {
dev_err(smem->dev, "Out of memory\n");
return -ENOSPC;
}
hdr->canary = SMEM_PRIVATE_CANARY;
hdr->item = cpu_to_le16(item);
hdr->size = cpu_to_le32(ALIGN(size, 8));
hdr->padding_data = cpu_to_le16(le32_to_cpu(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.
*/
dmb();
le32_add_cpu(&phdr->offset_free_uncached, alloc_size);
return 0;
}
static int qcom_smem_alloc_global(struct qcom_smem *smem,
unsigned int item,
size_t size)
{
struct smem_global_entry *entry;
struct smem_header *header;
header = smem->regions[0].virt_base;
entry = &header->toc[item];
if (entry->allocated)
return -EEXIST;
size = ALIGN(size, 8);
if (WARN_ON(size > le32_to_cpu(header->available)))
return -ENOMEM;
entry->offset = header->free_offset;
entry->size = cpu_to_le32(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.
*/
dmb();
entry->allocated = cpu_to_le32(1);
le32_add_cpu(&header->free_offset, size);
le32_add_cpu(&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.
*/
static int qcom_smem_alloc(unsigned int host, unsigned int item, size_t size)
{
struct smem_partition_header *phdr;
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;
}
if (WARN_ON(item >= __smem->item_count))
return -EINVAL;
if (host < SMEM_HOST_COUNT && __smem->partitions[host]) {
phdr = __smem->partitions[host];
ret = qcom_smem_alloc_private(__smem, phdr, item, size);
} else if (__smem->global_partition) {
phdr = __smem->global_partition;
ret = qcom_smem_alloc_private(__smem, phdr, item, size);
} else {
ret = qcom_smem_alloc_global(__smem, item, size);
}
return ret;
}
static void *qcom_smem_get_global(struct qcom_smem *smem,
unsigned int item,
size_t *size)
{
struct smem_header *header;
struct smem_region *area;
struct smem_global_entry *entry;
u32 aux_base;
unsigned int i;
header = smem->regions[0].virt_base;
entry = &header->toc[item];
if (!entry->allocated)
return ERR_PTR(-ENXIO);
aux_base = le32_to_cpu(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) {
if (size != NULL)
*size = le32_to_cpu(entry->size);
return area->virt_base + le32_to_cpu(entry->offset);
}
}
return ERR_PTR(-ENOENT);
}
static void *qcom_smem_get_private(struct qcom_smem *smem,
struct smem_partition_header *phdr,
size_t cacheline,
unsigned int item,
size_t *size)
{
struct smem_private_entry *e, *end;
e = phdr_to_first_uncached_entry(phdr);
end = phdr_to_last_uncached_entry(phdr);
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) -
le16_to_cpu(e->padding_data);
return uncached_entry_to_item(e);
}
e = uncached_entry_next(e);
}
/* Item was not found in the uncached list, search the cached list */
e = phdr_to_first_cached_entry(phdr, cacheline);
end = phdr_to_last_cached_entry(phdr);
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) -
le16_to_cpu(e->padding_data);
return cached_entry_to_item(e);
}
e = cached_entry_next(e, cacheline);
}
return ERR_PTR(-ENOENT);
invalid_canary:
dev_err(smem->dev, "Found invalid canary in hosts %d:%d partition\n",
phdr->host0, phdr->host1);
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.
*/
static void *qcom_smem_get(unsigned int host, unsigned int item, size_t *size)
{
struct smem_partition_header *phdr;
size_t cacheln;
void *ptr = ERR_PTR(-EPROBE_DEFER);
if (!__smem)
return ptr;
if (WARN_ON(item >= __smem->item_count))
return ERR_PTR(-EINVAL);
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);
}
return ptr;
}
/**
* 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.
*/
static int qcom_smem_get_free_space(unsigned int host)
{
struct smem_partition_header *phdr;
struct smem_header *header;
unsigned int 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;
}
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);
}
static int qcom_smem_set_global_partition(struct qcom_smem *smem)
{
struct smem_partition_header *header;
struct smem_ptable_entry *entry = NULL;
struct smem_ptable *ptable;
u32 host0, host1, size;
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];
host0 = le16_to_cpu(entry->host0);
host1 = le16_to_cpu(entry->host1);
if (host0 == SMEM_GLOBAL_HOST && host0 == host1)
break;
}
if (!entry) {
dev_err(smem->dev, "Missing entry for global partition\n");
return -EINVAL;
}
if (!le32_to_cpu(entry->offset) || !le32_to_cpu(entry->size)) {
dev_err(smem->dev, "Invalid entry for global partition\n");
return -EINVAL;
}
if (smem->global_partition) {
dev_err(smem->dev, "Already found the global partition\n");
return -EINVAL;
}
header = smem->regions[0].virt_base + le32_to_cpu(entry->offset);
host0 = le16_to_cpu(header->host0);
host1 = le16_to_cpu(header->host1);
if (memcmp(header->magic, SMEM_PART_MAGIC, sizeof(header->magic))) {
dev_err(smem->dev, "Global partition has invalid magic\n");
return -EINVAL;
}
if (host0 != SMEM_GLOBAL_HOST && host1 != SMEM_GLOBAL_HOST) {
dev_err(smem->dev, "Global partition hosts are invalid\n");
return -EINVAL;
}
if (le32_to_cpu(header->size) != le32_to_cpu(entry->size)) {
dev_err(smem->dev, "Global partition has invalid size\n");
return -EINVAL;
}
size = le32_to_cpu(header->offset_free_uncached);
if (size > le32_to_cpu(header->size)) {
dev_err(smem->dev,
"Global partition has invalid free pointer\n");
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,
unsigned int local_host)
{
struct smem_partition_header *header;
struct smem_ptable_entry *entry;
struct smem_ptable *ptable;
unsigned int remote_host;
u32 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];
host0 = le16_to_cpu(entry->host0);
host1 = le16_to_cpu(entry->host1);
if (host0 != local_host && host1 != local_host)
continue;
if (!le32_to_cpu(entry->offset))
continue;
if (!le32_to_cpu(entry->size))
continue;
if (host0 == local_host)
remote_host = host1;
else
remote_host = host0;
if (remote_host >= SMEM_HOST_COUNT) {
dev_err(smem->dev,
"Invalid remote host %d\n",
remote_host);
return -EINVAL;
}
if (smem->partitions[remote_host]) {
dev_err(smem->dev,
"Already found a partition for host %d\n",
remote_host);
return -EINVAL;
}
header = smem->regions[0].virt_base + le32_to_cpu(entry->offset);
host0 = le16_to_cpu(header->host0);
host1 = le16_to_cpu(header->host1);
if (memcmp(header->magic, SMEM_PART_MAGIC,
sizeof(header->magic))) {
dev_err(smem->dev,
"Partition %d has invalid magic\n", i);
return -EINVAL;
}
if (host0 != local_host && host1 != local_host) {
dev_err(smem->dev,
"Partition %d hosts are invalid\n", i);
return -EINVAL;
}
if (host0 != remote_host && host1 != remote_host) {
dev_err(smem->dev,
"Partition %d hosts are invalid\n", i);
return -EINVAL;
}
if (le32_to_cpu(header->size) != le32_to_cpu(entry->size)) {
dev_err(smem->dev,
"Partition %d has invalid size\n", i);
return -EINVAL;
}
if (le32_to_cpu(header->offset_free_uncached) > le32_to_cpu(header->size)) {
dev_err(smem->dev,
"Partition %d has invalid free pointer\n", i);
return -EINVAL;
}
smem->partitions[remote_host] = header;
smem->cacheline[remote_host] = le32_to_cpu(entry->cacheline);
}
return 0;
}
static int qcom_smem_map_memory(struct qcom_smem *smem, struct udevice *dev,
const char *name, int i)
{
struct fdt_resource r;
int ret;
int node = dev_of_offset(dev);
ret = fdtdec_lookup_phandle(gd->fdt_blob, node, name);
if (ret < 0) {
dev_err(dev, "No %s specified\n", name);
return -EINVAL;
}
ret = fdt_get_resource(gd->fdt_blob, ret, "reg", 0, &r);
if (ret)
return ret;
smem->regions[i].aux_base = (u32)r.start;
smem->regions[i].size = fdt_resource_size(&r);
smem->regions[i].virt_base = devm_ioremap(dev, r.start, fdt_resource_size(&r));
if (!smem->regions[i].virt_base)
return -ENOMEM;
return 0;
}
static int qcom_smem_probe(struct udevice *dev)
{
struct smem_header *header;
struct qcom_smem *smem;
size_t array_size;
int num_regions;
u32 version;
int ret;
int node = dev_of_offset(dev);
num_regions = 1;
if (fdtdec_lookup_phandle(gd->fdt_blob, node, "qcomrpm-msg-ram") >= 0)
num_regions++;
array_size = num_regions * sizeof(struct smem_region);
smem = devm_kzalloc(dev, sizeof(*smem) + array_size, GFP_KERNEL);
if (!smem)
return -ENOMEM;
smem->dev = dev;
smem->num_regions = num_regions;
ret = qcom_smem_map_memory(smem, dev, "memory-region", 0);
if (ret)
return ret;
if (num_regions > 1) {
ret = qcom_smem_map_memory(smem, dev,
"qcom,rpm-msg-ram", 1);
if (ret)
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(dev, "Unsupported SMEM version 0x%x\n", version);
return -EINVAL;
}
ret = qcom_smem_enumerate_partitions(smem, SMEM_HOST_APPS);
if (ret < 0 && ret != -ENOENT)
return ret;
__smem = smem;
return 0;
}
static int qcom_smem_remove(struct udevice *dev)
{
__smem = NULL;
return 0;
}
const struct udevice_id qcom_smem_of_match[] = {
{ .compatible = "qcom,smem" },
{ }
};
static const struct smem_ops msm_smem_ops = {
.alloc = qcom_smem_alloc,
.get = qcom_smem_get,
.get_free_space = qcom_smem_get_free_space,
};
U_BOOT_DRIVER(qcom_smem) = {
.name = "qcom_smem",
.id = UCLASS_SMEM,
.of_match = qcom_smem_of_match,
.ops = &msm_smem_ops,
.probe = qcom_smem_probe,
.remove = qcom_smem_remove,
};