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Subject[PATCH 3/6] firmware: qcom: scm: add support to restore secure config
Date
From: Rob Clark <robdclark@gmail.com>

Add support to restore the secure configuration that is needed by the
On Chip MEMory (OCMEM) that is present on some Snapdragon devices.

Signed-off-by: Rob Clark <robdclark@gmail.com>
[masneyb@onstation.org: ported to latest kernel; minor reformatting.]
Signed-off-by: Brian Masney <masneyb@onstation.org>
---
Rob's last version of this patch:
https://patchwork.kernel.org/patch/7340701/

drivers/firmware/qcom_scm-32.c | 21 +++++++++++++++++++++
drivers/firmware/qcom_scm-64.c | 6 ++++++
drivers/firmware/qcom_scm.c | 23 +++++++++++++++++++++++
drivers/firmware/qcom_scm.h | 6 ++++++
include/linux/qcom_scm.h | 13 +++++++++++++
5 files changed, 69 insertions(+)

diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
index 215061c581e1..089b47124933 100644
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -442,6 +442,27 @@ int __qcom_scm_hdcp_req(struct device *dev, struct qcom_scm_hdcp_req *req,
req, req_cnt * sizeof(*req), resp, sizeof(*resp));
}

+int __qcom_scm_restore_sec_config(struct device *dev, u32 sec_id,
+ u32 ctx_bank_num)
+{
+ struct msm_scm_sec_cfg {
+ __le32 id;
+ __le32 ctx_bank_num;
+ } cfg;
+ int ret, scm_ret = 0;
+
+ cfg.id = cpu_to_le32(sec_id);
+ cfg.ctx_bank_num = cpu_to_le32(sec_id);
+
+ ret = qcom_scm_call(dev, QCOM_SCM_MP_SVC, QCOM_SCM_MP_RESTORE_SEC_CFG,
+ &cfg, sizeof(cfg), &scm_ret, sizeof(scm_ret));
+
+ if (ret || scm_ret)
+ return ret ? ret : -EINVAL;
+
+ return 0;
+}
+
void __qcom_scm_init(void)
{
}
diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-64.c
index 91d5ad7cf58b..b6b78da7f9c9 100644
--- a/drivers/firmware/qcom_scm-64.c
+++ b/drivers/firmware/qcom_scm-64.c
@@ -241,6 +241,12 @@ int __qcom_scm_hdcp_req(struct device *dev, struct qcom_scm_hdcp_req *req,
return ret;
}

+int __qcom_scm_restore_sec_config(struct device *dev, u32 sec_id,
+ u32 ctx_bank_num)
+{
+ return -ENOTSUPP;
+}
+
void __qcom_scm_init(void)
{
u64 cmd;
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 2ddc118dba1b..5495ef994c5d 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -170,6 +170,29 @@ int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp)
}
EXPORT_SYMBOL(qcom_scm_hdcp_req);

+/**
+ * qcom_scm_restore_sec_config_available() - Check if secure environment
+ * supports restore security config interface.
+ *
+ * Return true if restore-cfg interface is supported, false if not.
+ */
+bool qcom_scm_restore_sec_config_available(void)
+{
+ return __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_MP_SVC,
+ QCOM_SCM_MP_RESTORE_SEC_CFG);
+}
+EXPORT_SYMBOL(qcom_scm_restore_sec_config_available);
+
+/**
+ * qcom_scm_restore_sec_config() - call restore-cfg interface
+ */
+int qcom_scm_restore_sec_config(struct device *dev,
+ enum qcom_scm_sec_dev_id sec_id)
+{
+ return __qcom_scm_restore_sec_config(dev, sec_id, 0);
+}
+EXPORT_SYMBOL(qcom_scm_restore_sec_config);
+
/**
* qcom_scm_pas_supported() - Check if the peripheral authentication service is
* available for the given peripherial
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index 99506bd873c0..bccc7d10c5c2 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -42,6 +42,12 @@ extern int __qcom_scm_hdcp_req(struct device *dev,

extern void __qcom_scm_init(void);

+#define QCOM_SCM_MP_SVC 0xc
+#define QCOM_SCM_MP_RESTORE_SEC_CFG 0x2
+
+extern int __qcom_scm_restore_sec_config(struct device *dev, u32 sec_id,
+ u32 ctx_bank_num);
+
#define QCOM_SCM_SVC_PIL 0x2
#define QCOM_SCM_PAS_INIT_IMAGE_CMD 0x1
#define QCOM_SCM_PAS_MEM_SETUP_CMD 0x2
diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
index 3f12cc77fb58..b5c0afaca955 100644
--- a/include/linux/qcom_scm.h
+++ b/include/linux/qcom_scm.h
@@ -24,6 +24,16 @@ struct qcom_scm_vmperm {
int perm;
};

+enum qcom_scm_sec_dev_id {
+ QCOM_SCM_MDSS_DEV_ID = 1,
+ QCOM_SCM_OCMEM_DEV_ID = 5,
+ QCOM_SCM_PCIE0_DEV_ID = 11,
+ QCOM_SCM_PCIE1_DEV_ID = 12,
+ QCOM_SCM_GFX_DEV_ID = 18,
+ QCOM_SCM_UFS_DEV_ID = 19,
+ QCOM_SCM_ICE_DEV_ID = 20,
+};
+
#define QCOM_SCM_VMID_HLOS 0x3
#define QCOM_SCM_VMID_MSS_MSA 0xF
#define QCOM_SCM_VMID_WLAN 0x18
@@ -41,6 +51,9 @@ extern bool qcom_scm_is_available(void);
extern bool qcom_scm_hdcp_available(void);
extern int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt,
u32 *resp);
+extern bool qcom_scm_restore_sec_config_available(void);
+extern int qcom_scm_restore_sec_config(struct device *dev,
+ enum qcom_scm_sec_dev_id sec_id);
extern bool qcom_scm_pas_supported(u32 peripheral);
extern int qcom_scm_pas_init_image(u32 peripheral, const void *metadata,
size_t size);
--
2.20.1
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