--- /dev/null
+From 968b497e1027ec78e986370976c76e1652aa0459 Mon Sep 17 00:00:00 2001
+From: Marek Szyprowski <m.szyprowski@samsung.com>
+Date: Fri, 28 Feb 2014 14:42:48 +0100
+Subject: [PATCH 050/182] drivers: of: add initialization code for dynamic
+ reserved memory
+
+This patch adds support for dynamically allocated reserved memory regions
+declared in device tree. Such regions are defined by 'size', 'alignment'
+and 'alloc-ranges' properties.
+
+Based on previous code provided by Josh Cartwright <joshc@codeaurora.org>
+
+Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
+Signed-off-by: Grant Likely <grant.likely@linaro.org>
+---
+ drivers/of/Kconfig | 6 ++
+ drivers/of/Makefile | 1 +
+ drivers/of/fdt.c | 13 ++-
+ drivers/of/of_reserved_mem.c | 188 +++++++++++++++++++++++++++++++++++++++
+ include/linux/of_reserved_mem.h | 21 +++++
+ 5 files changed, 227 insertions(+), 2 deletions(-)
+ create mode 100644 drivers/of/of_reserved_mem.c
+ create mode 100644 include/linux/of_reserved_mem.h
+
+diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
+index c6973f1..30a7d87 100644
+--- a/drivers/of/Kconfig
++++ b/drivers/of/Kconfig
+@@ -75,4 +75,10 @@ config OF_MTD
+ depends on MTD
+ def_bool y
+
++config OF_RESERVED_MEM
++ depends on OF_EARLY_FLATTREE
++ bool
++ help
++ Helpers to allow for reservation of memory regions
++
+ endmenu # OF
+diff --git a/drivers/of/Makefile b/drivers/of/Makefile
+index efd0510..ed9660a 100644
+--- a/drivers/of/Makefile
++++ b/drivers/of/Makefile
+@@ -9,3 +9,4 @@ obj-$(CONFIG_OF_MDIO) += of_mdio.o
+ obj-$(CONFIG_OF_PCI) += of_pci.o
+ obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o
+ obj-$(CONFIG_OF_MTD) += of_mtd.o
++obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
+diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
+index 819e112..510c0d8 100644
+--- a/drivers/of/fdt.c
++++ b/drivers/of/fdt.c
+@@ -15,6 +15,7 @@
+ #include <linux/module.h>
+ #include <linux/of.h>
+ #include <linux/of_fdt.h>
++#include <linux/of_reserved_mem.h>
+ #include <linux/sizes.h>
+ #include <linux/string.h>
+ #include <linux/errno.h>
+@@ -450,7 +451,7 @@ static int __init __reserved_mem_reserve_reg(unsigned long node,
+ phys_addr_t base, size;
+ unsigned long len;
+ __be32 *prop;
+- int nomap;
++ int nomap, first = 1;
+
+ prop = of_get_flat_dt_prop(node, "reg", &len);
+ if (!prop)
+@@ -477,6 +478,10 @@ static int __init __reserved_mem_reserve_reg(unsigned long node,
+ uname, &base, (unsigned long)size / SZ_1M);
+
+ len -= t_len;
++ if (first) {
++ fdt_reserved_mem_save_node(node, uname, base, size);
++ first = 0;
++ }
+ }
+ return 0;
+ }
+@@ -512,6 +517,7 @@ static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
+ {
+ static int found;
+ const char *status;
++ int err;
+
+ if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
+ if (__reserved_mem_check_root(node) != 0) {
+@@ -534,7 +540,9 @@ static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
+ if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
+ return 0;
+
+- __reserved_mem_reserve_reg(node, uname);
++ err = __reserved_mem_reserve_reg(node, uname);
++ if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL))
++ fdt_reserved_mem_save_node(node, uname, 0, 0);
+
+ /* scan next node */
+ return 0;
+@@ -550,6 +558,7 @@ static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
+ void __init early_init_fdt_scan_reserved_mem(void)
+ {
+ of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
++ fdt_init_reserved_mem();
+ }
+
+ /**
+diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
+new file mode 100644
+index 0000000..69b8117
+--- /dev/null
++++ b/drivers/of/of_reserved_mem.c
+@@ -0,0 +1,188 @@
++/*
++ * Device tree based initialization code for reserved memory.
++ *
++ * Copyright (c) 2013, The Linux Foundation. All Rights Reserved.
++ * Copyright (c) 2013,2014 Samsung Electronics Co., Ltd.
++ * http://www.samsung.com
++ * Author: Marek Szyprowski <m.szyprowski@samsung.com>
++ * Author: Josh Cartwright <joshc@codeaurora.org>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License as
++ * published by the Free Software Foundation; either version 2 of the
++ * License or (at your optional) any later version of the license.
++ */
++
++#include <linux/err.h>
++#include <linux/of.h>
++#include <linux/of_fdt.h>
++#include <linux/of_platform.h>
++#include <linux/mm.h>
++#include <linux/sizes.h>
++#include <linux/of_reserved_mem.h>
++
++#define MAX_RESERVED_REGIONS 16
++static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
++static int reserved_mem_count;
++
++#if defined(CONFIG_HAVE_MEMBLOCK)
++#include <linux/memblock.h>
++int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
++ phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
++ phys_addr_t *res_base)
++{
++ /*
++ * We use __memblock_alloc_base() because memblock_alloc_base()
++ * panic()s on allocation failure.
++ */
++ phys_addr_t base = __memblock_alloc_base(size, align, end);
++ if (!base)
++ return -ENOMEM;
++
++ /*
++ * Check if the allocated region fits in to start..end window
++ */
++ if (base < start) {
++ memblock_free(base, size);
++ return -ENOMEM;
++ }
++
++ *res_base = base;
++ if (nomap)
++ return memblock_remove(base, size);
++ return 0;
++}
++#else
++int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
++ phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
++ phys_addr_t *res_base)
++{
++ pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
++ size, nomap ? " (nomap)" : "");
++ return -ENOSYS;
++}
++#endif
++
++/**
++ * res_mem_save_node() - save fdt node for second pass initialization
++ */
++void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
++ phys_addr_t base, phys_addr_t size)
++{
++ struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
++
++ if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
++ pr_err("Reserved memory: not enough space all defined regions.\n");
++ return;
++ }
++
++ rmem->fdt_node = node;
++ rmem->name = uname;
++ rmem->base = base;
++ rmem->size = size;
++
++ reserved_mem_count++;
++ return;
++}
++
++/**
++ * res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'
++ * and 'alloc-ranges' properties
++ */
++static int __init __reserved_mem_alloc_size(unsigned long node,
++ const char *uname, phys_addr_t *res_base, phys_addr_t *res_size)
++{
++ int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
++ phys_addr_t start = 0, end = 0;
++ phys_addr_t base = 0, align = 0, size;
++ unsigned long len;
++ __be32 *prop;
++ int nomap;
++ int ret;
++
++ prop = of_get_flat_dt_prop(node, "size", &len);
++ if (!prop)
++ return -EINVAL;
++
++ if (len != dt_root_size_cells * sizeof(__be32)) {
++ pr_err("Reserved memory: invalid size property in '%s' node.\n",
++ uname);
++ return -EINVAL;
++ }
++ size = dt_mem_next_cell(dt_root_size_cells, &prop);
++
++ nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
++
++ prop = of_get_flat_dt_prop(node, "alignment", &len);
++ if (prop) {
++ if (len != dt_root_addr_cells * sizeof(__be32)) {
++ pr_err("Reserved memory: invalid alignment property in '%s' node.\n",
++ uname);
++ return -EINVAL;
++ }
++ align = dt_mem_next_cell(dt_root_addr_cells, &prop);
++ }
++
++ prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
++ if (prop) {
++
++ if (len % t_len != 0) {
++ pr_err("Reserved memory: invalid alloc-ranges property in '%s', skipping node.\n",
++ uname);
++ return -EINVAL;
++ }
++
++ base = 0;
++
++ while (len > 0) {
++ start = dt_mem_next_cell(dt_root_addr_cells, &prop);
++ end = start + dt_mem_next_cell(dt_root_size_cells,
++ &prop);
++
++ ret = early_init_dt_alloc_reserved_memory_arch(size,
++ align, start, end, nomap, &base);
++ if (ret == 0) {
++ pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
++ uname, &base,
++ (unsigned long)size / SZ_1M);
++ break;
++ }
++ len -= t_len;
++ }
++
++ } else {
++ ret = early_init_dt_alloc_reserved_memory_arch(size, align,
++ 0, 0, nomap, &base);
++ if (ret == 0)
++ pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
++ uname, &base, (unsigned long)size / SZ_1M);
++ }
++
++ if (base == 0) {
++ pr_info("Reserved memory: failed to allocate memory for node '%s'\n",
++ uname);
++ return -ENOMEM;
++ }
++
++ *res_base = base;
++ *res_size = size;
++
++ return 0;
++}
++
++/**
++ * fdt_init_reserved_mem - allocate and init all saved reserved memory regions
++ */
++void __init fdt_init_reserved_mem(void)
++{
++ int i;
++ for (i = 0; i < reserved_mem_count; i++) {
++ struct reserved_mem *rmem = &reserved_mem[i];
++ unsigned long node = rmem->fdt_node;
++ int err = 0;
++
++ if (rmem->size == 0)
++ err = __reserved_mem_alloc_size(node, rmem->name,
++ &rmem->base, &rmem->size);
++ }
++}
+diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
+new file mode 100644
+index 0000000..89226ed
+--- /dev/null
++++ b/include/linux/of_reserved_mem.h
+@@ -0,0 +1,21 @@
++#ifndef __OF_RESERVED_MEM_H
++#define __OF_RESERVED_MEM_H
++
++struct reserved_mem {
++ const char *name;
++ unsigned long fdt_node;
++ phys_addr_t base;
++ phys_addr_t size;
++};
++
++#ifdef CONFIG_OF_RESERVED_MEM
++void fdt_init_reserved_mem(void);
++void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
++ phys_addr_t base, phys_addr_t size);
++#else
++static inline void fdt_init_reserved_mem(void) { }
++static inline void fdt_reserved_mem_save_node(unsigned long node,
++ const char *uname, phys_addr_t base, phys_addr_t size) { }
++#endif
++
++#endif /* __OF_RESERVED_MEM_H */
+--
+1.7.10.4
+
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