Late versions of OP-TEE support a pseudo bus. TAs that behave as
hardware blocks (e.g TPM, RNG etc) present themselves on a bus which we can
scan. Unfortunately U-Boot doesn't support that yet. It's worth noting
that we already have a workaround for RNG. The details are in
commit 70812bb83da6 ("tee: optee: bind rng optee driver")
So let's add a list of devices based on U-Boot Kconfig options that we will
scan until we properly implement the tee-bus functionality.
While at it change the behaviour of the tee core itself wrt to device
binding. If some device binding fails, print a warning instead of
disabling OP-TEE.
Signed-off-by: Ilias Apalodimas <ilias.apalodi...@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklan...@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carri...@linaro.org>
---
Changes since v3:
- Use NULL instead of a child ptr on device_bind_driver(), since it's not
really needed
- Changed the style of the optee_bus_probe[] definition to
{.drv_name = xxx, .dev_name = yyy }
Changes since v2:
- Fixed typo on driver name ftpm-tee -> ftpm_tee
Changes since v1:
- remove a macro and use ARRAY_SIZE directly
drivers/tee/optee/core.c | 24 +++++++++++++++++++-----
1 file changed, 19 insertions(+), 5 deletions(-)
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index a89d62aaf0b3..c201a4635e6b 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -31,6 +31,18 @@ struct optee_pdata {
optee_invoke_fn *invoke_fn;
};
+static const struct {
+ const char *drv_name;
+ const char *dev_name;
+} optee_bus_probe[] = {
+#ifdef CONFIG_RNG_OPTEE
+ { .drv_name = "optee-rng", .dev_name = "optee-rng" },
+#endif
+#ifdef CONFIG_TPM2_FTPM_TEE
+ { .drv_name = "ftpm_tee", .dev_name = "ftpm_tee" },
+#endif
+};
+
struct rpc_param {
u32 a0;
u32 a1;
@@ -642,8 +654,7 @@ static int optee_probe(struct udevice *dev)
{
struct optee_pdata *pdata = dev_get_plat(dev);
u32 sec_caps;
- struct udevice *child;
- int ret;
+ int ret, i;
if (!is_optee_api(pdata->invoke_fn)) {
dev_err(dev, "OP-TEE api uid mismatch\n");
@@ -672,10 +683,13 @@ static int optee_probe(struct udevice *dev)
* in U-Boot, the discovery of TA on the TEE bus is not supported:
* only bind the drivers associated to the supported OP-TEE TA
*/
- if (IS_ENABLED(CONFIG_RNG_OPTEE)) {
- ret = device_bind_driver(dev, "optee-rng", "optee-rng", &child);
+
+ for (i = 0; i < ARRAY_SIZE(optee_bus_probe); i++) {
+ ret = device_bind_driver(dev, optee_bus_probe[i].drv_name,
+ optee_bus_probe[i].dev_name, NULL);
if (ret)
- return ret;
+ dev_warn(dev, "Failed to bind device %s\n",
+ optee_bus_probe[i].dev_name);
}
return 0;
--
2.37.2
