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>

2 files changed, 12 insertions, 2 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 */
 
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index fde90bacc65e..042af1abfc4d 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -194,6 +194,13 @@ int64_t opal_ipmi_recv(uint64_t interface, struct opal_ipmi_msg *msg,
 int64_t opal_i2c_request(uint64_t async_token, uint32_t bus_id,
                          struct opal_i2c_request *oreq);
 
+int64_t opal_flash_read(uint64_t id, uint64_t offset, uint64_t buf,
+                uint64_t size, uint64_t token);
+int64_t opal_flash_write(uint64_t id, uint64_t offset, uint64_t buf,
+                uint64_t size, uint64_t token);
+int64_t opal_flash_erase(uint64_t id, uint64_t offset, uint64_t size,
+                uint64_t token);
+
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
                                    int depth, void *data);
@@ -226,7 +233,7 @@ extern int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data);
 struct rtc_time;
 extern unsigned long opal_get_boot_time(void);
 extern void opal_nvram_init(void);
-extern void opal_flash_init(void);
+extern void opal_flash_update_init(void);
 extern void opal_flash_term_callback(void);
 extern int opal_elog_init(void);
 extern void opal_platform_dump_init(void);