eb69992dd5
The old logic assumes CMDLINE_FROM_BOOTLOADER vs. CMDLINE_FORCE and
ignores CMDLINE_EXTEND. Here's the old logic:
- CONFIG_CMDLINE_FORCE=true
CONFIG_CMDLINE
- dt bootargs=non-empty:
dt bootargs
- dt bootargs=empty, @data is non-empty string
@data is left unchanged
- dt bootargs=empty, @data is empty string
CONFIG_CMDLINE (or "" if that's not defined)
The new logic is now documented in of_fdt.h and is copied here for
reference:
- CONFIG_CMDLINE_FORCE=true
CONFIG_CMDLINE
- CONFIG_CMDLINE_EXTEND=true, @data is non-empty string
@data + dt bootargs (even if dt bootargs are empty)
- CONFIG_CMDLINE_EXTEND=true, @data is empty string
CONFIG_CMDLINE + dt bootargs (even if dt bootargs are empty)
- CMDLINE_FROM_BOOTLOADER=true, dt bootargs=non-empty:
dt bootargs
- CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is non-empty string
@data is left unchanged
- CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is empty string
CONFIG_CMDLINE (or "" if that's not defined)
Signed-off-by: Doug Anderson <dianders@chromium.org>
CC: devicetree-discuss@lists.ozlabs.org
CC: Grant Likely <grant.likely@secretlab.ca>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Rob Herring <rob.herring@calxeda.com>
Change-Id: I40ace250847f813358125dfcaa8998fd32cf7ea3
Signed-off-by: Colin Cross <ccross@android.com>
[AmitP: Folded following android-4.9 commit changes into this patch
e820270abb5d ("ANDROID: of: fix CONFIG_CMDLINE_EXTEND")
9a4a74055444 ("ANDROID: of: Fix build warnings")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
133 lines
5 KiB
C
133 lines
5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Definitions for working with the Flattened Device Tree data format
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*
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* Copyright 2009 Benjamin Herrenschmidt, IBM Corp
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* benh@kernel.crashing.org
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*/
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#ifndef _LINUX_OF_FDT_H
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#define _LINUX_OF_FDT_H
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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/* Definitions used by the flattened device tree */
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#define OF_DT_HEADER 0xd00dfeed /* marker */
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_OF_FLATTREE)
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struct device_node;
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/* For scanning an arbitrary device-tree at any time */
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extern char *of_fdt_get_string(const void *blob, u32 offset);
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extern void *of_fdt_get_property(const void *blob,
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unsigned long node,
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const char *name,
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int *size);
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extern bool of_fdt_is_big_endian(const void *blob,
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unsigned long node);
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extern int of_fdt_match(const void *blob, unsigned long node,
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const char *const *compat);
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extern void *of_fdt_unflatten_tree(const unsigned long *blob,
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struct device_node *dad,
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struct device_node **mynodes);
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/* TBD: Temporary export of fdt globals - remove when code fully merged */
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extern int __initdata dt_root_addr_cells;
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extern int __initdata dt_root_size_cells;
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extern void *initial_boot_params;
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extern char __dtb_start[];
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extern char __dtb_end[];
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/* Other Prototypes */
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extern u64 of_flat_dt_translate_address(unsigned long node);
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extern void of_fdt_limit_memory(int limit);
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#endif /* CONFIG_OF_FLATTREE */
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#ifdef CONFIG_OF_EARLY_FLATTREE
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/* For scanning the flat device-tree at boot time */
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extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
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int depth, void *data),
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void *data);
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extern int of_scan_flat_dt_subnodes(unsigned long node,
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int (*it)(unsigned long node,
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const char *uname,
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void *data),
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void *data);
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extern int of_get_flat_dt_subnode_by_name(unsigned long node,
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const char *uname);
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extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
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int *size);
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extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
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extern int of_flat_dt_match(unsigned long node, const char *const *matches);
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extern unsigned long of_get_flat_dt_root(void);
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extern int of_get_flat_dt_size(void);
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extern uint32_t of_get_flat_dt_phandle(unsigned long node);
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/*
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* early_init_dt_scan_chosen - scan the device tree for ramdisk and bootargs
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*
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* The boot arguments will be placed into the memory pointed to by @data.
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* That memory should be COMMAND_LINE_SIZE big and initialized to be a valid
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* (possibly empty) string. Logic for what will be in @data after this
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* function finishes:
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*
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* - CONFIG_CMDLINE_FORCE=true
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* CONFIG_CMDLINE
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* - CONFIG_CMDLINE_EXTEND=true, @data is non-empty string
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* @data + dt bootargs (even if dt bootargs are empty)
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* - CONFIG_CMDLINE_EXTEND=true, @data is empty string
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* CONFIG_CMDLINE + dt bootargs (even if dt bootargs are empty)
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* - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=non-empty:
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* dt bootargs
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* - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is non-empty string
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* @data is left unchanged
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* - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is empty string
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* CONFIG_CMDLINE (or "" if that's not defined)
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*/
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extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
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int depth, void *data);
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extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
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int depth, void *data);
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extern int early_init_dt_scan_chosen_stdout(void);
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extern void early_init_fdt_scan_reserved_mem(void);
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extern void early_init_fdt_reserve_self(void);
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extern void early_init_dt_add_memory_arch(u64 base, u64 size);
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extern int early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size);
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extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
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bool no_map);
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extern u64 dt_mem_next_cell(int s, const __be32 **cellp);
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/* Early flat tree scan hooks */
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extern int early_init_dt_scan_root(unsigned long node, const char *uname,
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int depth, void *data);
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extern bool early_init_dt_scan(void *params);
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extern bool early_init_dt_verify(void *params);
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extern void early_init_dt_scan_nodes(void);
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extern const char *of_flat_dt_get_machine_name(void);
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extern const void *of_flat_dt_match_machine(const void *default_match,
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const void * (*get_next_compat)(const char * const**));
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/* Other Prototypes */
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extern void unflatten_device_tree(void);
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extern void unflatten_and_copy_device_tree(void);
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extern void early_init_devtree(void *);
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extern void early_get_first_memblock_info(void *, phys_addr_t *);
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#else /* CONFIG_OF_EARLY_FLATTREE */
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static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }
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static inline void early_init_fdt_scan_reserved_mem(void) {}
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static inline void early_init_fdt_reserve_self(void) {}
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static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
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static inline void unflatten_device_tree(void) {}
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static inline void unflatten_and_copy_device_tree(void) {}
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#endif /* CONFIG_OF_EARLY_FLATTREE */
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#endif /* __ASSEMBLY__ */
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#endif /* _LINUX_OF_FDT_H */
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