[PATCH 14/16] remoteproc/pru: configure firmware based on client setup

[Roger Quadros]

From: Tero Kristo <t-kristo@xxxxxx>

Client device node property firmware-name is now used to configure
firmware for the PRU instances. The default firmware is also
restored once releasing the PRU resource.

Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
Reviewed-by: Roger Quadros <rogerq@xxxxxx>
Signed-off-by: Suman Anna <s-anna@xxxxxx>
---
 drivers/remoteproc/pru_rproc.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index 9a08937..84f006b 100644
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -132,6 +132,21 @@ void pru_control_set_reg(struct pru_rproc *pru, unsigned int reg,
 	spin_unlock_irqrestore(&pru->rmw_lock, flags);
 }
 
+/**
+ * pru_rproc_set_firmware() - set firmware for a pru core
+ * @rproc: the rproc instance of the PRU
+ * @fw_name: the new firmware name, or NULL if default is desired
+ */
+static int pru_rproc_set_firmware(struct rproc *rproc, const char *fw_name)
+{
+	struct pru_rproc *pru = rproc->priv;
+
+	if (!fw_name)
+		fw_name = pru->fw_name;
+
+	return rproc_set_firmware(rproc, fw_name);
+}
+
 static struct rproc *__pru_rproc_get(struct device_node *np, int index)
 {
 	struct device_node *rproc_np = NULL;
@@ -189,6 +204,7 @@ struct rproc *pru_rproc_get(struct device_node *np, int index)
 	struct device *dev;
 	int ret;
 	u32 mux;
+	const char *fw_name;
 
 	rproc = __pru_rproc_get(np, index);
 	if (IS_ERR(rproc))
@@ -225,6 +241,16 @@ struct rproc *pru_rproc_get(struct device_node *np, int index)
 		}
 	}
 
+	ret = of_property_read_string_index(np, "firmware-name", index,
+					    &fw_name);
+	if (!ret) {
+		ret = pru_rproc_set_firmware(rproc, fw_name);
+		if (ret) {
+			dev_err(dev, "failed to set firmware: %d\n", ret);
+			goto err;
+		}
+	}
+
 	return rproc;
 
 err:
@@ -255,6 +281,7 @@ void pru_rproc_put(struct rproc *rproc)
 	if (!pru->client_np)
 		return;
 
+	pru_rproc_set_firmware(rproc, NULL);
 	pruss_cfg_set_gpmux(pru->pruss, pru->id, pru->gpmux_save);
 
 	mutex_lock(&pru->lock);
-- 
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