optee: add FF-A support

Adds support for using FF-A [1] as transport to the OP-TEE driver.

Introduces struct optee_msg_param_fmem which carries all information
needed when OP-TEE is calling FFA_MEM_RETRIEVE_REQ to get the shared
memory reference mapped by the hypervisor in S-EL2. Register usage is
also updated to include the information needed.

The FF-A part of this driver is enabled if CONFIG_ARM_FFA_TRANSPORT is
enabled.

[1] https://developer.arm.com/documentation/den0077/latest
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

1 files changed, 26 insertions, 1 deletions

diff --git a/drivers/tee/optee/optee_msg.h b/drivers/tee/optee/optee_msg.h
index e3d72d09c484..2422e185d400 100644
--- a/drivers/tee/optee/optee_msg.h
+++ b/drivers/tee/optee/optee_msg.h
@@ -28,6 +28,9 @@
 #define OPTEE_MSG_ATTR_TYPE_RMEM_INPUT		0x5
 #define OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT		0x6
 #define OPTEE_MSG_ATTR_TYPE_RMEM_INOUT		0x7
+#define OPTEE_MSG_ATTR_TYPE_FMEM_INPUT		OPTEE_MSG_ATTR_TYPE_RMEM_INPUT
+#define OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT		OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT
+#define OPTEE_MSG_ATTR_TYPE_FMEM_INOUT		OPTEE_MSG_ATTR_TYPE_RMEM_INOUT
 #define OPTEE_MSG_ATTR_TYPE_TMEM_INPUT		0x9
 #define OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT		0xa
 #define OPTEE_MSG_ATTR_TYPE_TMEM_INOUT		0xb
@@ -96,6 +99,8 @@
  */
 #define OPTEE_MSG_NONCONTIG_PAGE_SIZE		4096
 
+#define OPTEE_MSG_FMEM_INVALID_GLOBAL_ID	0xffffffffffffffff
+
 /**
  * struct optee_msg_param_tmem - temporary memory reference parameter
  * @buf_ptr:	Address of the buffer
@@ -128,6 +133,23 @@ struct optee_msg_param_rmem {
 };
 
 /**
+ * struct optee_msg_param_fmem - ffa memory reference parameter
+ * @offs_lower:	   Lower bits of offset into shared memory reference
+ * @offs_upper:	   Upper bits of offset into shared memory reference
+ * @internal_offs: Internal offset into the first page of shared memory
+ *		   reference
+ * @size:	   Size of the buffer
+ * @global_id:	   Global identifier of Shared memory
+ */
+struct optee_msg_param_fmem {
+	u32 offs_low;
+	u16 offs_high;
+	u16 internal_offs;
+	u64 size;
+	u64 global_id;
+};
+
+/**
  * struct optee_msg_param_value - opaque value parameter
  *
  * Value parameters are passed unchecked between normal and secure world.
@@ -143,13 +165,15 @@ struct optee_msg_param_value {
  * @attr:	attributes
  * @tmem:	parameter by temporary memory reference
  * @rmem:	parameter by registered memory reference
+ * @fmem:	parameter by ffa registered memory reference
  * @value:	parameter by opaque value
  * @octets:	parameter by octet string
  *
  * @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in
  * the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value or octets,
  * OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and
- * OPTEE_MSG_ATTR_TYPE_RMEM_* indicates @rmem,
+ * OPTEE_MSG_ATTR_TYPE_RMEM_* or the alias PTEE_MSG_ATTR_TYPE_FMEM_* indicates
+ * @rmem or @fmem depending on the conduit.
  * OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
  */
 struct optee_msg_param {
@@ -157,6 +181,7 @@ struct optee_msg_param {
 	union {
 		struct optee_msg_param_tmem tmem;
 		struct optee_msg_param_rmem rmem;
+		struct optee_msg_param_fmem fmem;
 		struct optee_msg_param_value value;
 		u8 octets[24];
 	} u;