powerpc/powernv: Add interfaces for flash device access

This change adds the OPAL interface definitions to allow Linux to read,
write and erase from system flash devices. We register platform devices
for the flash devices exported by firmware.

We clash with the existing opal_flash_init function, which is really for
the FSP flash update functionality, so we rename that initcall to
opal_flash_update_init().

A future change will add an mtd driver that uses this interface.

Changes from Joel Stanley and Jeremy Kerr.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index e8a6baf55e82..0321a909e663 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -150,7 +150,10 @@
 #define OPAL_IPMI_SEND                          107
 #define OPAL_IPMI_RECV                          108
 #define OPAL_I2C_REQUEST                        109
-#define OPAL_LAST                               109
+#define OPAL_FLASH_READ                         110
+#define OPAL_FLASH_WRITE                        111
+#define OPAL_FLASH_ERASE                        112
+#define OPAL_LAST                               112
 
 /* Device tree flags */