[PATCH 13/16] remoteproc/pru: add support for configuring GPMUX based on client setup

Roger Quadros
2018-11-26T07:52:46Z

From: Tero Kristo <t-kristo@ti.com>

Client device node property ti,pruss-gp-mux-sel can now be used to
configure the GPMUX config value for PRU.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
[s-anna@ti.com: simplify the pru id usage]
Signed-off-by: Suman Anna <s-anna@ti.com>
---
drivers/remoteproc/pru_rproc.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index d8b823d..9a08937 100644
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -72,6 +72,7 @@ enum pru_mem {
* @sdram_da: device address of secondary Data RAM for this PRU
* @shrdram_da: device address of shared Data RAM
* @fw_name: name of firmware image used during loading
+ * @gpmux_save: saved value for gpmux config
* @lock: mutex to protect client usage
* @dbg_single_step: debug state variable to set PRU into single step mode
* @dbg_continuous: debug state variable to restore PRU execution mode
@@ -95,6 +96,7 @@ struct pru_rproc {
u32 sdram_da;
u32 shrdram_da;
const char *fw_name;
+ u8 gpmux_save;
struct mutex lock; /* client access lock */
u32 dbg_single_step;
u32 dbg_continuous;
@@ -184,12 +186,16 @@ struct rproc *pru_rproc_get(struct device_node *np, int index)
{
struct rproc *rproc;
struct pru_rproc *pru;
+ struct device *dev;
+ int ret;
+ u32 mux;

rproc = __pru_rproc_get(np, index);
if (IS_ERR(rproc))
return rproc;

pru = rproc->priv;
+ dev = &rproc->dev;

mutex_lock(&pru->lock);

@@ -203,7 +209,27 @@ struct rproc *pru_rproc_get(struct device_node *np, int index)

mutex_unlock(&pru->lock);

+ ret = pruss_cfg_get_gpmux(pru->pruss, pru->id, &pru->gpmux_save);
+ if (ret) {
+ dev_err(dev, "failed to get cfg gpmux: %d\n", ret);
+ goto err;
+ }
+
+ ret = of_property_read_u32_index(np, "ti,pruss-gp-mux-sel", index,
+ &mux);
+ if (!ret) {
+ ret = pruss_cfg_set_gpmux(pru->pruss, pru->id, mux);
+ if (ret) {
+ dev_err(dev, "failed to set cfg gpmux: %d\n", ret);
+ goto err;
+ }
+ }
+
return rproc;
+
+err:
+ pru_rproc_put(rproc);
+ return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(pru_rproc_get);

@@ -229,6 +255,8 @@ void pru_rproc_put(struct rproc *rproc)
if (!pru->client_np)
return;

+ pruss_cfg_set_gpmux(pru->pruss, pru->id, pru->gpmux_save);
+
mutex_lock(&pru->lock);
pru->client_np = NULL;
mutex_unlock(&pru->lock);