[U-Boot] [RFC PATCH] dm: Add support for all targets which requires MANUAL_RELOC

[Michal Simek]

Targets with CONFIG_NEEDS_MANUAL_RELOC do not use REL/RELA
relocation (mostly only GOT) where functions aray are not
updated. This patch is fixing function pointers for DM core
and serial-uclass to ensure that relocated functions are called.

Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

 drivers/core/root.c            | 64 ++++++++++++++++++++++++++++++++++++++++++
 drivers/serial/serial-uclass.c | 16 +++++++++++
 2 files changed, 80 insertions(+)

diff --git a/drivers/core/root.c b/drivers/core/root.c
index 47b3acfbe981..1a5287b2fe08 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -36,6 +36,65 @@ struct udevice *dm_root(void)
 	return gd->dm_root;
 }

+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+void fix_drivers(void)
+{
+	struct driver *drv =
+		ll_entry_start(struct driver, driver);
+	const int n_ents = ll_entry_count(struct driver, driver);
+	struct driver *entry;
+
+	for (entry = drv; entry != drv + n_ents; entry++) {
+		if (entry->of_match)
+			entry->of_match = (const struct udevice_id *)
+				((u32)entry->of_match + gd->reloc_off);
+		if (entry->bind)
+			entry->bind += gd->reloc_off;
+		if (entry->probe)
+			entry->probe += gd->reloc_off;
+		if (entry->remove)
+			entry->remove += gd->reloc_off;
+		if (entry->unbind)
+			entry->unbind += gd->reloc_off;
+		if (entry->ofdata_to_platdata)
+			entry->ofdata_to_platdata += gd->reloc_off;
+		if (entry->child_pre_probe)
+			entry->child_pre_probe += gd->reloc_off;
+		if (entry->child_post_remove)
+			entry->child_post_remove += gd->reloc_off;
+		/* OPS are fixed in every uclass post_probe function */
+		if (entry->ops)
+			entry->ops += gd->reloc_off;
+	}
+}
+
+void fix_uclass(void)
+{
+	struct uclass_driver *uclass =
+		ll_entry_start(struct uclass_driver, uclass);
+	const int n_ents = ll_entry_count(struct uclass_driver, uclass);
+	struct uclass_driver *entry;
+
+	for (entry = uclass; entry != uclass + n_ents; entry++) {
+		if (entry->post_bind)
+			entry->post_bind += gd->reloc_off;
+		if (entry->pre_unbind)
+			entry->pre_unbind += gd->reloc_off;
+		if (entry->post_probe)
+			entry->post_probe += gd->reloc_off;
+		if (entry->pre_remove)
+			entry->pre_remove += gd->reloc_off;
+		if (entry->init)
+			entry->init += gd->reloc_off;
+		if (entry->destroy)
+			entry->destroy += gd->reloc_off;
+		/* FIXME maybe also need to fix these ops */
+		if (entry->ops)
+			entry->ops += gd->reloc_off;
+	}
+}
+#endif
+
 int dm_init(void)
 {
 	int ret;
@@ -46,6 +105,11 @@ int dm_init(void)
 	}
 	INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);

+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+	fix_drivers();
+	fix_uclass();
+#endif
+
 	ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
 	if (ret)
 		return ret;
diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c
index d1b5777cecda..f13484b8539c 100644
--- a/drivers/serial/serial-uclass.c
+++ b/drivers/serial/serial-uclass.c
@@ -258,6 +258,22 @@ static int serial_post_probe(struct udevice *dev)
 #endif
 	int ret;

+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+	if (ops->setbrg)
+		ops->setbrg += gd->reloc_off;
+	if (ops->getc)
+		ops->getc += gd->reloc_off;
+	if (ops->putc)
+		ops->putc += gd->reloc_off;
+	if (ops->pending)
+		ops->pending += gd->reloc_off;
+	if (ops->clear)
+		ops->clear += gd->reloc_off;
+#if CONFIG_POST & CONFIG_SYS_POST_UART
+	if (ops->loop)
+		ops->loop += gd->reloc_off
+#endif
+#endif
 	/* Set the baud rate */
 	if (ops->setbrg) {
 		ret = ops->setbrg(dev, gd->baudrate);
--
1.8.2.3

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