[PATCH v7 5/5] remoteproc: pru: Configure firmware based on client setup

From: MD Danish Anwar
Date: Mon Oct 31 2022 - 03:38:40 EST


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.

Co-developed-by: Suman Anna <s-anna@xxxxxx>
Signed-off-by: Suman Anna <s-anna@xxxxxx>
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@xxxxxxxxxx>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@xxxxxxxxxx>
Signed-off-by: Puranjay Mohan <p-mohan@xxxxxx>
Signed-off-by: MD Danish Anwar <danishanwar@xxxxxx>
---
drivers/remoteproc/pru_rproc.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)

diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index 3d1870e6b13b..15ffaeddd963 100644
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -172,6 +172,23 @@ 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
+ *
+ * Return: 0 on success, or errno in error case.
+ */
+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 rproc *rproc;
@@ -230,6 +247,7 @@ struct rproc *pru_rproc_get(struct device_node *np, int index,
struct rproc *rproc;
struct pru_rproc *pru;
struct device *dev;
+ const char *fw_name;
int ret;

rproc = __pru_rproc_get(np, index);
@@ -256,11 +274,25 @@ struct rproc *pru_rproc_get(struct device_node *np, int index,
if (pru_id)
*pru_id = pru->id;

+ 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_no_rproc_handle:
rproc_put(rproc);
return ERR_PTR(ret);
+
+err:
+ pru_rproc_put(rproc);
+ return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(pru_rproc_get);

@@ -280,6 +312,8 @@ void pru_rproc_put(struct rproc *rproc)

pru = rproc->priv;

+ pru_rproc_set_firmware(rproc, NULL);
+
mutex_lock(&pru->lock);

if (!pru->client_np) {
--
2.25.1