mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 09:12:39 +00:00
86 lines
2.8 KiB
Diff
86 lines
2.8 KiB
Diff
|
From df2f34ef1d924125ffaf29dfdaf7cdbd3183c321 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Patrick Delaunay <patrick.delaunay@foss.st.com>
|
||
|
|
Date: Mon, 6 Feb 2023 13:43:52 +0000
|
||
|
|
Subject: [PATCH] nvmem: stm32: detect bsec pta presence for STM32MP15x
|
||
|
|
|
||
|
|
On STM32MP15x SoC, the SMC backend is optional when OP-TEE is used;
|
||
|
|
the PTA BSEC should be used as it is done on STM32MP13x platform,
|
||
|
|
but the BSEC SMC can be also used: it is a legacy mode in OP-TEE,
|
||
|
|
not recommended but used in previous OP-TEE firmware.
|
||
|
|
|
||
|
|
The presence of OP-TEE is dynamically detected in STM32MP15x device tree
|
||
|
|
and the supported NVMEM backend is dynamically detected:
|
||
|
|
- PTA with stm32_bsec_pta_find
|
||
|
|
- SMC with stm32_bsec_check
|
||
|
|
|
||
|
|
With OP-TEE but without PTA and SMC detection, the probe is deferred for
|
||
|
|
STM32MP15x devices.
|
||
|
|
|
||
|
|
On STM32MP13x platform, only the PTA is supported with cfg->ta = true
|
||
|
|
and this detection is skipped.
|
||
|
|
|
||
|
|
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
|
||
|
|
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
|
||
|
|
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
|
||
|
|
Link: https://lore.kernel.org/r/20230206134356.839737-19-srinivas.kandagatla@linaro.org
|
||
|
|
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
||
|
|
---
|
||
|
|
drivers/nvmem/stm32-romem.c | 38 +++++++++++++++++++++++++++++++++----
|
||
|
|
1 file changed, 34 insertions(+), 4 deletions(-)
|
||
|
|
|
||
|
|
--- a/drivers/nvmem/stm32-romem.c
|
||
|
|
+++ b/drivers/nvmem/stm32-romem.c
|
||
|
|
@@ -159,6 +159,31 @@ static int stm32_bsec_pta_write(void *co
|
||
|
|
return stm32_bsec_optee_ta_write(priv->ctx, priv->lower, offset, buf, bytes);
|
||
|
|
}
|
||
|
|
|
||
|
|
+static bool stm32_bsec_smc_check(void)
|
||
|
|
+{
|
||
|
|
+ u32 val;
|
||
|
|
+ int ret;
|
||
|
|
+
|
||
|
|
+ /* check that the OP-TEE support the BSEC SMC (legacy mode) */
|
||
|
|
+ ret = stm32_bsec_smc(STM32_SMC_READ_SHADOW, 0, 0, &val);
|
||
|
|
+
|
||
|
|
+ return !ret;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static bool optee_presence_check(void)
|
||
|
|
+{
|
||
|
|
+ struct device_node *np;
|
||
|
|
+ bool tee_detected = false;
|
||
|
|
+
|
||
|
|
+ /* check that the OP-TEE node is present and available. */
|
||
|
|
+ np = of_find_compatible_node(NULL, NULL, "linaro,optee-tz");
|
||
|
|
+ if (np && of_device_is_available(np))
|
||
|
|
+ tee_detected = true;
|
||
|
|
+ of_node_put(np);
|
||
|
|
+
|
||
|
|
+ return tee_detected;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
static int stm32_romem_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
const struct stm32_romem_cfg *cfg;
|
||
|
|
@@ -195,11 +220,16 @@ static int stm32_romem_probe(struct plat
|
||
|
|
} else {
|
||
|
|
priv->cfg.size = cfg->size;
|
||
|
|
priv->lower = cfg->lower;
|
||
|
|
- if (cfg->ta) {
|
||
|
|
+ if (cfg->ta || optee_presence_check()) {
|
||
|
|
rc = stm32_bsec_optee_ta_open(&priv->ctx);
|
||
|
|
- /* wait for OP-TEE client driver to be up and ready */
|
||
|
|
- if (rc)
|
||
|
|
- return rc;
|
||
|
|
+ if (rc) {
|
||
|
|
+ /* wait for OP-TEE client driver to be up and ready */
|
||
|
|
+ if (rc == -EPROBE_DEFER)
|
||
|
|
+ return -EPROBE_DEFER;
|
||
|
|
+ /* BSEC PTA is required or SMC not supported */
|
||
|
|
+ if (cfg->ta || !stm32_bsec_smc_check())
|
||
|
|
+ return rc;
|
||
|
|
+ }
|
||
|
|
}
|
||
|
|
if (priv->ctx) {
|
||
|
|
rc = devm_add_action_or_reset(dev, stm32_bsec_optee_ta_close, priv->ctx);
|