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-rw-r--r--target/linux/ipq806x/patches/0049-drivers-of-add-initialization-code-for-static-reserv.patch216
1 files changed, 216 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches/0049-drivers-of-add-initialization-code-for-static-reserv.patch b/target/linux/ipq806x/patches/0049-drivers-of-add-initialization-code-for-static-reserv.patch
new file mode 100644
index 0000000000..f520e6cc7a
--- /dev/null
+++ b/target/linux/ipq806x/patches/0049-drivers-of-add-initialization-code-for-static-reserv.patch
@@ -0,0 +1,216 @@
+From 60ee5b21ce14a7d5c269115b0751b904d0e005ed Mon Sep 17 00:00:00 2001
+From: Marek Szyprowski <m.szyprowski@samsung.com>
+Date: Fri, 28 Feb 2014 14:42:47 +0100
+Subject: [PATCH 049/182] drivers: of: add initialization code for static
+ reserved memory
+
+This patch adds support for static (defined by 'reg' property) reserved
+memory regions declared in device tree.
+
+Memory blocks can be reliably reserved only during early boot. This must
+happen before the whole memory management subsystem is initialized,
+because we need to ensure that the given contiguous blocks are not yet
+allocated by kernel. Also it must happen before kernel mappings for the
+whole low memory are created, to ensure that there will be no mappings
+(for reserved blocks). Typically, all this happens before device tree
+structures are unflattened, so we need to get reserved memory layout
+directly from fdt.
+
+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/fdt.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++
+ include/linux/of_fdt.h | 4 ++
+ 2 files changed, 135 insertions(+)
+
+diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
+index 758b4f8..819e112 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/sizes.h>
+ #include <linux/string.h>
+ #include <linux/errno.h>
+ #include <linux/slab.h>
+@@ -440,6 +441,118 @@ struct boot_param_header *initial_boot_params;
+ #ifdef CONFIG_OF_EARLY_FLATTREE
+
+ /**
++ * res_mem_reserve_reg() - reserve all memory described in 'reg' property
++ */
++static int __init __reserved_mem_reserve_reg(unsigned long node,
++ const char *uname)
++{
++ int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
++ phys_addr_t base, size;
++ unsigned long len;
++ __be32 *prop;
++ int nomap;
++
++ prop = of_get_flat_dt_prop(node, "reg", &len);
++ if (!prop)
++ return -ENOENT;
++
++ if (len && len % t_len != 0) {
++ pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
++ uname);
++ return -EINVAL;
++ }
++
++ nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
++
++ while (len >= t_len) {
++ base = dt_mem_next_cell(dt_root_addr_cells, &prop);
++ size = dt_mem_next_cell(dt_root_size_cells, &prop);
++
++ if (base && size &&
++ early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
++ pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
++ uname, &base, (unsigned long)size / SZ_1M);
++ else
++ pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
++ uname, &base, (unsigned long)size / SZ_1M);
++
++ len -= t_len;
++ }
++ return 0;
++}
++
++/**
++ * __reserved_mem_check_root() - check if #size-cells, #address-cells provided
++ * in /reserved-memory matches the values supported by the current implementation,
++ * also check if ranges property has been provided
++ */
++static int __reserved_mem_check_root(unsigned long node)
++{
++ __be32 *prop;
++
++ prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
++ if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
++ return -EINVAL;
++
++ prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
++ if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
++ return -EINVAL;
++
++ prop = of_get_flat_dt_prop(node, "ranges", NULL);
++ if (!prop)
++ return -EINVAL;
++ return 0;
++}
++
++/**
++ * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
++ */
++static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
++ int depth, void *data)
++{
++ static int found;
++ const char *status;
++
++ if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
++ if (__reserved_mem_check_root(node) != 0) {
++ pr_err("Reserved memory: unsupported node format, ignoring\n");
++ /* break scan */
++ return 1;
++ }
++ found = 1;
++ /* scan next node */
++ return 0;
++ } else if (!found) {
++ /* scan next node */
++ return 0;
++ } else if (found && depth < 2) {
++ /* scanning of /reserved-memory has been finished */
++ return 1;
++ }
++
++ status = of_get_flat_dt_prop(node, "status", NULL);
++ if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
++ return 0;
++
++ __reserved_mem_reserve_reg(node, uname);
++
++ /* scan next node */
++ return 0;
++}
++
++/**
++ * early_init_fdt_scan_reserved_mem() - create reserved memory regions
++ *
++ * This function grabs memory from early allocator for device exclusive use
++ * defined in device tree structures. It should be called by arch specific code
++ * once the early allocator (i.e. memblock) has been fully activated.
++ */
++void __init early_init_fdt_scan_reserved_mem(void)
++{
++ of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
++}
++
++/**
+ * of_scan_flat_dt - scan flattened tree blob and call callback on each.
+ * @it: callback function
+ * @data: context data pointer
+@@ -856,6 +969,16 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
+ memblock_add(base, size);
+ }
+
++int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
++ phys_addr_t size, bool nomap)
++{
++ if (memblock_is_region_reserved(base, size))
++ return -EBUSY;
++ if (nomap)
++ return memblock_remove(base, size);
++ return memblock_reserve(base, size);
++}
++
+ /*
+ * called from unflatten_device_tree() to bootstrap devicetree itself
+ * Architectures can override this definition if memblock isn't used
+@@ -864,6 +987,14 @@ void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
+ {
+ return __va(memblock_alloc(size, align));
+ }
++#else
++int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
++ phys_addr_t size, bool nomap)
++{
++ pr_err("Reserved memory not supported, ignoring range 0x%llx - 0x%llx%s\n",
++ base, size, nomap ? " (nomap)" : "");
++ return -ENOSYS;
++}
+ #endif
+
+ bool __init early_init_dt_scan(void *params)
+diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
+index 2b77058..ddd7219 100644
+--- a/include/linux/of_fdt.h
++++ b/include/linux/of_fdt.h
+@@ -98,7 +98,10 @@ extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
+ int depth, void *data);
+ extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
+ int depth, void *data);
++extern void early_init_fdt_scan_reserved_mem(void);
+ extern void early_init_dt_add_memory_arch(u64 base, u64 size);
++extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
++ bool no_map);
+ extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
+ extern u64 dt_mem_next_cell(int s, __be32 **cellp);
+
+@@ -118,6 +121,7 @@ extern void unflatten_and_copy_device_tree(void);
+ extern void early_init_devtree(void *);
+ extern void early_get_first_memblock_info(void *, phys_addr_t *);
+ #else /* CONFIG_OF_FLATTREE */
++static inline void early_init_fdt_scan_reserved_mem(void) {}
+ static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
+ static inline void unflatten_device_tree(void) {}
+ static inline void unflatten_and_copy_device_tree(void) {}
+--
+1.7.10.4
+
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