[Skiboot] [PATCH 1/3] external/common: Teach ARM code to erase 'mtd chips'

[Cyril Bur]

Currently the arch flash code for all architectures can only perform
chip erases if there is a real flash driver attached.

With increasing use of MTD on both host and BMC this code needs to know
how to behave of the backend of blocklevel is MTD.

This patch teaches the ARM specific code to pass an erase for the full
size of the chip down the stack. This can be optimised into a chip erase
within the kernel.

Signed-off-by: Cyril Bur <cyril.bur at au1.ibm.com>
---
 external/common/arch_flash_arm.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/external/common/arch_flash_arm.c b/external/common/arch_flash_arm.c
index 697609d..bb8800f 100644
--- a/external/common/arch_flash_arm.c
+++ b/external/common/arch_flash_arm.c
@@ -300,8 +300,17 @@ int arch_flash_erase_chip(struct blocklevel_device *bl)
 	if (!arch_data.init_bl || arch_data.init_bl != bl)
 		return -1;
 
-	if (!arch_data.flash_chip)
-		return -1;
+	if (!arch_data.flash_chip) {
+		/* Just assume its a regular erase */
+		int rc;
+		uint64_t total_size;
+
+		rc = blocklevel_get_info(bl, NULL, &total_size, NULL);
+		if (rc)
+			return rc;
+
+		return blocklevel_erase(bl, 0, total_size);
+	}
 
 	return flash_erase_chip(arch_data.flash_chip);
 }
-- 
2.10.2