firmware: qcom_scm: Add set remote state API

This patch adds a set remote state SCM API.  This will be used by the
Venus and GPU subsystems to set state on the remote processors.

This work was based on two patch sets by Jordan Crouse and Stanimir
Varbanov.

Signed-off-by: Andy Gross <andy.gross@linaro.org>

4 files changed, 42 insertions, 0 deletions

diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
index c6aeedb..8ad226c 100644
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -560,3 +560,21 @@ int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
 
 	return ret ? : le32_to_cpu(out);
 }
+
+int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id)
+{
+	struct {
+		__le32 state;
+		__le32 id;
+	} req;
+	__le32 scm_ret = 0;
+	int ret;
+
+	req.state = cpu_to_le32(state);
+	req.id = cpu_to_le32(id);
+
+	ret = qcom_scm_call(dev, QCOM_SCM_SVC_BOOT, QCOM_SCM_SET_REMOTE_STATE,
+			    &req, sizeof(req), &scm_ret, sizeof(scm_ret));
+
+	return ret ? : le32_to_cpu(scm_ret);
+}
diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-64.c
index 4a0f5ea..4b220ab 100644
--- a/drivers/firmware/qcom_scm-64.c
+++ b/drivers/firmware/qcom_scm-64.c
@@ -358,3 +358,19 @@ int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
 
 	return ret ? : res.a1;
 }
+
+int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id)
+{
+	struct qcom_scm_desc desc = {0};
+	struct arm_smccc_res res;
+	int ret;
+
+	desc.args[0] = state;
+	desc.args[1] = id;
+	desc.arginfo = QCOM_SCM_ARGS(2);
+
+	ret = qcom_scm_call(dev, QCOM_SCM_SVC_BOOT, QCOM_SCM_SET_REMOTE_STATE,
+			    &desc, &res);
+
+	return ret ? : res.a1;
+}
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 65d0d9d..d987bcc 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -324,6 +324,12 @@ bool qcom_scm_is_available(void)
 }
 EXPORT_SYMBOL(qcom_scm_is_available);
 
+int qcom_scm_set_remote_state(u32 state, u32 id)
+{
+	return __qcom_scm_set_remote_state(__scm->dev, state, id);
+}
+EXPORT_SYMBOL(qcom_scm_set_remote_state);
+
 static int qcom_scm_probe(struct platform_device *pdev)
 {
 	struct qcom_scm *scm;
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index 3584b00..6a0f154 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -15,6 +15,8 @@
 #define QCOM_SCM_SVC_BOOT		0x1
 #define QCOM_SCM_BOOT_ADDR		0x1
 #define QCOM_SCM_BOOT_ADDR_MC		0x11
+#define QCOM_SCM_SET_REMOTE_STATE	0xa
+extern int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id);
 
 #define QCOM_SCM_FLAG_HLOS		0x01
 #define QCOM_SCM_FLAG_COLDBOOT_MC	0x02