[PATCH 1/3] fixup! common: add initial barebox deep-probe support

[Marco Felsch <m.felsch@pengutronix.de>]

---
Hi,

this is just a proposal to change the current linker array approach to
an initcall approach. Why? Because now we can simply register a
board-driver without having to list each compatible. 

I used the pure_initcall without adding a new one, since the
documentation says that pure_initcalls are used to init variables. In
our case we init boards_list.

Regards,
  Marco

 common/deep-probe.c               | 38 +++++++++++++++++++++++++++++--
 include/asm-generic/barebox.lds.h | 10 +-------
 include/deep-probe.h              | 34 +++++++++++++++------------
 3 files changed, 56 insertions(+), 26 deletions(-)

diff --git a/common/deep-probe.c b/common/deep-probe.c
index 9fc67f170c..6b04b4f5da 100644
--- a/common/deep-probe.c
+++ b/common/deep-probe.c
@@ -2,8 +2,16 @@
 
 #include <common.h>
 #include <deep-probe.h>
+#include <linux/list.h>
 #include <of.h>
 
+struct deep_probe_entry {
+	struct list_head entry;
+	const char *compatible;
+};
+
+LIST_HEAD(boards_list);
+
 enum deep_probe_state {
 	DEEP_PROBE_UNKONWN = -1,
 	DEEP_PROBE_NOT_SUPPORTED,
@@ -12,6 +20,33 @@ enum deep_probe_state {
 
 static enum deep_probe_state boardstate = DEEP_PROBE_UNKONWN;
 
+int deep_probe_enable_board(const struct driver_d *board_driver, const char *compatible)
+{
+	struct deep_probe_entry *new;
+
+	if (!board_driver && !compatible)
+		return -EINVAL;
+
+	if (board_driver) {
+		const struct of_device_id *of_device_ids = board_driver->of_compatible;
+
+		for (; of_device_ids->compatible; of_device_ids++) {
+			new = xzalloc(sizeof(*new));
+			new->compatible = of_device_ids->compatible;
+			list_add(&new->entry, &boards_list);
+		}
+	}
+
+	if (compatible) {
+		new = xzalloc(sizeof(*new));
+		new->compatible = compatible;
+		list_add(&new->entry, &boards_list);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(deep_probe_enable_board);
+
 bool deep_probe_is_supported(void)
 {
 	struct deep_probe_entry *board;
@@ -20,8 +55,7 @@ bool deep_probe_is_supported(void)
 		return boardstate;
 
 	/* determine boardstate */
-	for (board = &__barebox_deep_probe_start;
-	     board != &__barebox_deep_probe_end; board++) {
+	list_for_each_entry(board, &boards_list, entry) {
 		if (of_machine_is_compatible(board->compatible)) {
 			boardstate = DEEP_PROBE_SUPPORTED;
 			return true;
diff --git a/include/asm-generic/barebox.lds.h b/include/asm-generic/barebox.lds.h
index c5f9d97547..a7d32160d1 100644
--- a/include/asm-generic/barebox.lds.h
+++ b/include/asm-generic/barebox.lds.h
@@ -114,13 +114,6 @@
 	KEEP(*(.rsa_keys.rodata.*));		\
 	__rsa_keys_end = .;			\
 
-#define BAREBOX_DEEP_PROBE			\
-	STRUCT_ALIGN();				\
-	__barebox_deep_probe_start = .;		\
-	KEEP(*(SORT_BY_NAME(.barebox_deep_probe*)))	\
-	__barebox_deep_probe_end = .;
-
-
 #ifdef CONFIG_CONSTRUCTORS
 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 			__ctors_start = .;                 \
@@ -143,8 +136,7 @@
 	BAREBOX_CLK_TABLE			\
 	BAREBOX_DTB				\
 	BAREBOX_RSA_KEYS			\
-	BAREBOX_PCI_FIXUP			\
-	BAREBOX_DEEP_PROBE
+	BAREBOX_PCI_FIXUP
 
 #if defined(CONFIG_ARCH_BAREBOX_MAX_BARE_INIT_SIZE) && \
 CONFIG_ARCH_BAREBOX_MAX_BARE_INIT_SIZE < CONFIG_BAREBOX_MAX_BARE_INIT_SIZE
diff --git a/include/deep-probe.h b/include/deep-probe.h
index a646c10340..e00bd9bafe 100644
--- a/include/deep-probe.h
+++ b/include/deep-probe.h
@@ -2,25 +2,29 @@
 #ifndef __DEEP_PROBE_H
 #define __DEEP_PROBE_H
 
-#include <linux/stringify.h>
-#include <linux/types.h>
-
-struct deep_probe_entry {
-	const char *compatible;
-};
+struct driver_d;
 
 bool deep_probe_is_supported(void);
+int deep_probe_enable_board(const struct driver_d *board_driver, const char *compatible);
+
+#define _deep_probe_enable_driver(id,drv)			\
+	static int __init id(void)				\
+	{							\
+		return deep_probe_enable_board(&drv,NULL);	\
+	}							\
+	pure_initcall(id)
 
-extern struct deep_probe_entry __barebox_deep_probe_start;
-extern struct deep_probe_entry __barebox_deep_probe_end;
+#define deep_probe_enable_board_driver(drv)			\
+	_deep_probe_enable_driver(__UNIQUE_ID(deepprobe),drv)
 
-#define __BAREBOX_DEEP_PROBE_ENABLE(_entry,_compatible)			\
-	static const struct deep_probe_entry _entry			\
-	__attribute__ ((used,section (".barebox_deep_probe_" __stringify(_entry)))) = { \
-		.compatible = _compatible,				\
-	}
+#define _deep_probe_enable_compatible(id,compatible)		\
+	static int __init id(void)				\
+	{							\
+		return deep_probe_enable_board(NULL,compatible);\
+	}							\
+	pure_initcall(id)
 
-#define BAREBOX_DEEP_PROBE_ENABLE(_compatible)	\
-	__BAREBOX_DEEP_PROBE_ENABLE(__UNIQUE_ID(deepprobe),_compatible)
+#define deep_probe_enable_board_compatible(compatible)		\
+	_deep_probe_enable_compatible(__UNIQUE_ID(deepprobe),compatible)
 
 #endif /* __DEEP_PROBE_H */
-- 
2.29.2


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