[PATCH 3/6] firmware: qcom: scm: add support to restore secure config

[Brian Masney]

From: Rob Clark <robdclark at 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 at gmail.com>
[masneyb at onstation.org: ported to latest kernel; minor reformatting.]
Signed-off-by: Brian Masney <masneyb at 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