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authorLinus Torvalds <torvalds@linux-foundation.org>2013-11-12 16:52:17 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-12 16:52:17 +0900
commit10d0c9705e80bbd3d587c5fad24599aabaca6688 (patch)
tree9456083a1b04b8d98da08d88e937cfeff80e2a7d /drivers/of/fdt.c
parent85b656cf1560e27a89354a23f2c10ba229d2f173 (diff)
parentc11eede69b6ad0ac44ebc1e021a8d2699c5f1f8f (diff)
Merge tag 'devicetree-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
Pull devicetree updates from Rob Herring: "DeviceTree updates for 3.13. This is a bit larger pull request than usual for this cycle with lots of clean-up. - Cross arch clean-up and consolidation of early DT scanning code. - Clean-up and removal of arch prom.h headers. Makes arch specific prom.h optional on all but Sparc. - Addition of interrupts-extended property for devices connected to multiple interrupt controllers. - Refactoring of DT interrupt parsing code in preparation for deferred probe of interrupts. - ARM cpu and cpu topology bindings documentation. - Various DT vendor binding documentation updates" * tag 'devicetree-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (82 commits) powerpc: add missing explicit OF includes for ppc dt/irq: add empty of_irq_count for !OF_IRQ dt: disable self-tests for !OF_IRQ of: irq: Fix interrupt-map entry matching MIPS: Netlogic: replace early_init_devtree() call of: Add Panasonic Corporation vendor prefix of: Add Chunghwa Picture Tubes Ltd. vendor prefix of: Add AU Optronics Corporation vendor prefix of/irq: Fix potential buffer overflow of/irq: Fix bug in interrupt parsing refactor. of: set dma_mask to point to coherent_dma_mask of: add vendor prefix for PHYTEC Messtechnik GmbH DT: sort vendor-prefixes.txt of: Add vendor prefix for Cadence of: Add empty for_each_available_child_of_node() macro definition arm/versatile: Fix versatile irq specifications. of/irq: create interrupts-extended property microblaze/pci: Drop PowerPC-ism from irq parsing of/irq: Create of_irq_parse_and_map_pci() to consolidate arch code. of/irq: Use irq_of_parse_and_map() ...
Diffstat (limited to 'drivers/of/fdt.c')
-rw-r--r--drivers/of/fdt.c138
1 files changed, 135 insertions, 3 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index a4fa9ad31b8f..2fa024b97c43 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -618,12 +618,72 @@ int __init of_scan_flat_dt_by_path(const char *path,
return ret;
}
+const char * __init of_flat_dt_get_machine_name(void)
+{
+ const char *name;
+ unsigned long dt_root = of_get_flat_dt_root();
+
+ name = of_get_flat_dt_prop(dt_root, "model", NULL);
+ if (!name)
+ name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
+ return name;
+}
+
+/**
+ * of_flat_dt_match_machine - Iterate match tables to find matching machine.
+ *
+ * @default_match: A machine specific ptr to return in case of no match.
+ * @get_next_compat: callback function to return next compatible match table.
+ *
+ * Iterate through machine match tables to find the best match for the machine
+ * compatible string in the FDT.
+ */
+const void * __init of_flat_dt_match_machine(const void *default_match,
+ const void * (*get_next_compat)(const char * const**))
+{
+ const void *data = NULL;
+ const void *best_data = default_match;
+ const char *const *compat;
+ unsigned long dt_root;
+ unsigned int best_score = ~1, score = 0;
+
+ dt_root = of_get_flat_dt_root();
+ while ((data = get_next_compat(&compat))) {
+ score = of_flat_dt_match(dt_root, compat);
+ if (score > 0 && score < best_score) {
+ best_data = data;
+ best_score = score;
+ }
+ }
+ if (!best_data) {
+ const char *prop;
+ long size;
+
+ pr_err("\n unrecognized device tree list:\n[ ");
+
+ prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
+ if (prop) {
+ while (size > 0) {
+ printk("'%s' ", prop);
+ size -= strlen(prop) + 1;
+ prop += strlen(prop) + 1;
+ }
+ }
+ printk("]\n\n");
+ return NULL;
+ }
+
+ pr_info("Machine model: %s\n", of_flat_dt_get_machine_name());
+
+ return best_data;
+}
+
#ifdef CONFIG_BLK_DEV_INITRD
/**
* early_init_dt_check_for_initrd - Decode initrd location from flat tree
* @node: reference to node containing initrd location ('chosen')
*/
-void __init early_init_dt_check_for_initrd(unsigned long node)
+static void __init early_init_dt_check_for_initrd(unsigned long node)
{
u64 start, end;
unsigned long len;
@@ -641,12 +701,15 @@ void __init early_init_dt_check_for_initrd(unsigned long node)
return;
end = of_read_number(prop, len/4);
- early_init_dt_setup_initrd_arch(start, end);
+ initrd_start = (unsigned long)__va(start);
+ initrd_end = (unsigned long)__va(end);
+ initrd_below_start_ok = 1;
+
pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n",
(unsigned long long)start, (unsigned long long)end);
}
#else
-inline void early_init_dt_check_for_initrd(unsigned long node)
+static inline void early_init_dt_check_for_initrd(unsigned long node)
{
}
#endif /* CONFIG_BLK_DEV_INITRD */
@@ -774,6 +837,25 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
}
#ifdef CONFIG_HAVE_MEMBLOCK
+void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+ const u64 phys_offset = __pa(PAGE_OFFSET);
+ base &= PAGE_MASK;
+ size &= PAGE_MASK;
+ if (base + size < phys_offset) {
+ pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
+ base, base + size);
+ return;
+ }
+ if (base < phys_offset) {
+ pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
+ base, phys_offset);
+ size -= phys_offset - base;
+ base = phys_offset;
+ }
+ memblock_add(base, size);
+}
+
/*
* called from unflatten_device_tree() to bootstrap devicetree itself
* Architectures can override this definition if memblock isn't used
@@ -784,6 +866,32 @@ void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
}
#endif
+bool __init early_init_dt_scan(void *params)
+{
+ if (!params)
+ return false;
+
+ /* Setup flat device-tree pointer */
+ initial_boot_params = params;
+
+ /* check device tree validity */
+ if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) {
+ initial_boot_params = NULL;
+ return false;
+ }
+
+ /* Retrieve various information from the /chosen node */
+ of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
+
+ /* Initialize {size,address}-cells info */
+ of_scan_flat_dt(early_init_dt_scan_root, NULL);
+
+ /* Setup memory, calling early_init_dt_add_memory_arch */
+ of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+
+ return true;
+}
+
/**
* unflatten_device_tree - create tree of device_nodes from flat blob
*
@@ -801,4 +909,28 @@ void __init unflatten_device_tree(void)
of_alias_scan(early_init_dt_alloc_memory_arch);
}
+/**
+ * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob
+ *
+ * Copies and unflattens the device-tree passed by the firmware, creating the
+ * tree of struct device_node. It also fills the "name" and "type"
+ * pointers of the nodes so the normal device-tree walking functions
+ * can be used. This should only be used when the FDT memory has not been
+ * reserved such is the case when the FDT is built-in to the kernel init
+ * section. If the FDT memory is reserved already then unflatten_device_tree
+ * should be used instead.
+ */
+void __init unflatten_and_copy_device_tree(void)
+{
+ int size = __be32_to_cpu(initial_boot_params->totalsize);
+ void *dt = early_init_dt_alloc_memory_arch(size,
+ __alignof__(struct boot_param_header));
+
+ if (dt) {
+ memcpy(dt, initial_boot_params, size);
+ initial_boot_params = dt;
+ }
+ unflatten_device_tree();
+}
+
#endif /* CONFIG_OF_EARLY_FLATTREE */