[PATCH v5 07/11] firmware: qcom_scm: ipq5332: add msa lock/unlock support

[Manikanta Mylavarapu]

IPQ5332 user pd remoteproc firmwares need to be locked
with MSA(modem secure access) features. This patch add
support to lock/unlock MSA features.

Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@xxxxxxxxxxx>
---
Changes in v5:
	- Moved to EXPORT_SYMBOL_GPL() because scm driver moved to
	  using EXPORT_SYMBOL_GPL() now.

Changes in v4:
	- Rebased on linux-next

 drivers/firmware/qcom_scm.c            | 78 ++++++++++++++++++++++++++
 drivers/firmware/qcom_scm.h            |  2 +
 include/linux/firmware/qcom/qcom_scm.h |  2 +
 3 files changed, 82 insertions(+)

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 5e1ff137ab52..ae5c6e495e19 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -676,6 +676,84 @@ bool qcom_scm_pas_supported(u32 peripheral)
 }
 EXPORT_SYMBOL_GPL(qcom_scm_pas_supported);
 
+/**
+ * qcom_scm_msa_lock() - Lock given peripheral firmware region as MSA
+ *
+ * @peripheral:	peripheral id
+ *
+ * Return 0 on success.
+ */
+int qcom_scm_msa_lock(u32 peripheral)
+{
+	int ret;
+	struct qcom_scm_desc desc = {
+		.svc = QCOM_SCM_SVC_PIL,
+		.cmd = QCOM_SCM_MSA_LOCK,
+		.arginfo = QCOM_SCM_ARGS(1),
+		.args[0] = peripheral,
+		.owner = ARM_SMCCC_OWNER_SIP,
+	};
+	struct qcom_scm_res res;
+
+	if (!__qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_PIL,
+					  QCOM_SCM_MSA_LOCK))
+		return 0;
+
+	ret = qcom_scm_clk_enable();
+	if (ret)
+		return ret;
+
+	ret = qcom_scm_bw_enable();
+	if (ret)
+		return ret;
+
+	ret = qcom_scm_call(__scm->dev, &desc, &res);
+	qcom_scm_bw_disable();
+	qcom_scm_clk_disable();
+
+	return ret ? : res.result[0];
+}
+EXPORT_SYMBOL_GPL(qcom_scm_msa_lock);
+
+/**
+ * qcom_scm_msa_unlock() - Unlock given peripheral MSA firmware region
+ *
+ * @peripheral:	peripheral id
+ *
+ * Return 0 on success.
+ */
+int qcom_scm_msa_unlock(u32 peripheral)
+{
+	int ret;
+	struct qcom_scm_desc desc = {
+		.svc = QCOM_SCM_SVC_PIL,
+		.cmd = QCOM_SCM_MSA_UNLOCK,
+		.arginfo = QCOM_SCM_ARGS(1),
+		.args[0] = peripheral,
+		.owner = ARM_SMCCC_OWNER_SIP,
+	};
+	struct qcom_scm_res res;
+
+	if (!__qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_PIL,
+					  QCOM_SCM_MSA_UNLOCK))
+		return 0;
+
+	ret = qcom_scm_clk_enable();
+	if (ret)
+		return ret;
+
+	ret = qcom_scm_bw_enable();
+	if (ret)
+		return ret;
+
+	ret = qcom_scm_call(__scm->dev, &desc, &res);
+	qcom_scm_bw_disable();
+	qcom_scm_clk_disable();
+
+	return ret ? : res.result[0];
+}
+EXPORT_SYMBOL_GPL(qcom_scm_msa_unlock);
+
 static int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
 {
 	struct qcom_scm_desc desc = {
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index 6ab5e7c77e8d..9480b0b57c3d 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -97,6 +97,8 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
 #define QCOM_SCM_PIL_PAS_SHUTDOWN	0x06
 #define QCOM_SCM_PIL_PAS_IS_SUPPORTED	0x07
 #define QCOM_SCM_PIL_PAS_MSS_RESET	0x0a
+#define QCOM_SCM_MSA_LOCK		0x24
+#define QCOM_SCM_MSA_UNLOCK		0x25
 
 #define QCOM_SCM_SVC_IO			0x05
 #define QCOM_SCM_IO_READ		0x01
diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
index 0c091a3f6d49..58c476941e71 100644
--- a/include/linux/firmware/qcom/qcom_scm.h
+++ b/include/linux/firmware/qcom/qcom_scm.h
@@ -81,6 +81,8 @@ extern int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr,
 extern int qcom_scm_pas_auth_and_reset(u32 peripheral);
 extern int qcom_scm_pas_shutdown(u32 peripheral);
 extern bool qcom_scm_pas_supported(u32 peripheral);
+extern int qcom_scm_msa_lock(u32 peripheral);
+extern int qcom_scm_msa_unlock(u32 peripheral);
 
 extern int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val);
 extern int qcom_scm_io_writel(phys_addr_t addr, unsigned int val);
-- 
2.34.1