[PATCH v4 4/5] soc: ti: pruss: Add helper functions to set GPI mode, MII_RT_event and XFR

[MD Danish Anwar]

From: Suman Anna <s-anna at ti.com>

The PRUSS CFG module is represented as a syscon node and is currently
managed by the PRUSS platform driver. Add easy accessor functions to set
GPI mode, MII_RT event enable/disable and XFR (XIN XOUT) enable/disable
to enable the PRUSS Ethernet usecase. These functions reuse the generic
pruss_cfg_update() API function.

Signed-off-by: Suman Anna <s-anna at ti.com>
Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk at linaro.org>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk at linaro.org>
Signed-off-by: Puranjay Mohan <p-mohan at ti.com>
Signed-off-by: MD Danish Anwar <danishanwar at ti.com>
---
 drivers/soc/ti/pruss.c           | 60 ++++++++++++++++++++++++++++++++
 include/linux/remoteproc/pruss.h | 22 ++++++++++++
 2 files changed, 82 insertions(+)

diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
index 26d8129b515c..2f04b7922ddb 100644
--- a/drivers/soc/ti/pruss.c
+++ b/drivers/soc/ti/pruss.c
@@ -203,6 +203,66 @@ static int pruss_cfg_update(struct pruss *pruss, unsigned int reg,
 	return regmap_update_bits(pruss->cfg_regmap, reg, mask, val);
 }
 
+/**
+ * pruss_cfg_gpimode() - set the GPI mode of the PRU
+ * @pruss: the pruss instance handle
+ * @pru_id: id of the PRU core within the PRUSS
+ * @mode: GPI mode to set
+ *
+ * Sets the GPI mode for a given PRU by programming the
+ * corresponding PRUSS_CFG_GPCFGx register
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+int pruss_cfg_gpimode(struct pruss *pruss, enum pruss_pru_id pru_id,
+		      enum pruss_gpi_mode mode)
+{
+	if (pru_id < 0 || pru_id >= PRUSS_NUM_PRUS)
+		return -EINVAL;
+
+	if (mode < 0 || mode > PRUSS_GPI_MODE_MAX)
+		return -EINVAL;
+
+	return pruss_cfg_update(pruss, PRUSS_CFG_GPCFG(pru_id),
+				PRUSS_GPCFG_PRU_GPI_MODE_MASK,
+				mode << PRUSS_GPCFG_PRU_GPI_MODE_SHIFT);
+}
+EXPORT_SYMBOL_GPL(pruss_cfg_gpimode);
+
+/**
+ * pruss_cfg_miirt_enable() - Enable/disable MII RT Events
+ * @pruss: the pruss instance
+ * @enable: enable/disable
+ *
+ * Enable/disable the MII RT Events for the PRUSS.
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+int pruss_cfg_miirt_enable(struct pruss *pruss, bool enable)
+{
+	u32 set = enable ? PRUSS_MII_RT_EVENT_EN : 0;
+
+	return pruss_cfg_update(pruss, PRUSS_CFG_MII_RT,
+				PRUSS_MII_RT_EVENT_EN, set);
+}
+EXPORT_SYMBOL_GPL(pruss_cfg_miirt_enable);
+
+/**
+ * pruss_cfg_xfr_enable() - Enable/disable XIN XOUT shift functionality
+ * @pruss: the pruss instance
+ * @enable: enable/disable
+ * @mask: Mask for PRU / RTU
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+int pruss_cfg_xfr_enable(struct pruss *pruss, bool enable, u32 mask)
+{
+	u32 set = enable ? mask : 0;
+
+	return pruss_cfg_update(pruss, PRUSS_CFG_SPP, mask, set);
+}
+EXPORT_SYMBOL_GPL(pruss_cfg_xfr_enable);
+
 static void pruss_of_free_clk_provider(void *data)
 {
 	struct device_node *clk_mux_np = data;
diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h
index 12ef10b9fe9a..51a3eedd2be6 100644
--- a/include/linux/remoteproc/pruss.h
+++ b/include/linux/remoteproc/pruss.h
@@ -101,6 +101,7 @@ enum pruss_gpi_mode {
 	PRUSS_GPI_MODE_PARALLEL,
 	PRUSS_GPI_MODE_28BIT_SHIFT,
 	PRUSS_GPI_MODE_MII,
+	PRUSS_GPI_MODE_MAX,
 };
 
 /**
@@ -165,6 +166,10 @@ int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id,
 			     struct pruss_mem_region *region);
 int pruss_release_mem_region(struct pruss *pruss,
 			     struct pruss_mem_region *region);
+int pruss_cfg_gpimode(struct pruss *pruss, enum pruss_pru_id pru_id,
+		      enum pruss_gpi_mode mode);
+int pruss_cfg_miirt_enable(struct pruss *pruss, bool enable);
+int pruss_cfg_xfr_enable(struct pruss *pruss, bool enable, u32 mask);
 
 #else
 
@@ -188,6 +193,23 @@ static inline int pruss_release_mem_region(struct pruss *pruss,
 	return -EOPNOTSUPP;
 }
 
+static inline int pruss_cfg_gpimode(struct pruss *pruss,
+				    enum pruss_pru_id pru_id,
+				    enum pruss_gpi_mode mode)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
+static inline int pruss_cfg_miirt_enable(struct pruss *pruss, bool enable)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
+static inline int pruss_cfg_xfr_enable(struct pruss *pruss, bool enable, u32 mask)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
 #endif /* CONFIG_TI_PRUSS */
 
 #if IS_ENABLED(CONFIG_PRU_REMOTEPROC)
-- 
2.25.1