[PATCH 11/16] soc: ti: pruss: add helper functions to set GPI mode, MII_RT_event and XFR

[Roger Quadros <rogerq@ti.com>]

From: Suman Anna <s-anna@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_regmap_update() API function.

Signed-off-by: Suman Anna <s-anna@ti.com>
---
 include/linux/pruss.h | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)

diff --git a/include/linux/pruss.h b/include/linux/pruss.h
index c0a3b3e..7227aae 100644
--- a/include/linux/pruss.h
+++ b/include/linux/pruss.h
@@ -204,6 +204,69 @@ int pruss_intc_configure(struct pruss *pruss,
 int pruss_intc_unconfigure(struct pruss *pruss,
 			   struct pruss_intc_config *intc_config);
 
+/**
+ * pruss_cfg_get_gpmux() - get the current GPMUX value for a PRU device
+ * @pruss: pruss instance
+ * @id: PRU identifier (0-1)
+ * @mux: pointer to store the current mux value into
+ */
+static inline int pruss_cfg_get_gpmux(struct pruss *pruss,
+				      enum pruss_pru_id id, u8 *mux)
+{
+	int ret = 0;
+	u32 val;
+
+	ret = pruss_cfg_read(pruss, PRUSS_CFG_GPCFG(id), &val);
+	if (!ret)
+		*mux = (u8)((val & PRUSS_GPCFG_PRU_MUX_SEL_MASK) >>
+			    PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
+	return ret;
+}
+
+/**
+ * pruss_cfg_set_gpmux() - set the GPMUX value for a PRU device
+ * @pruss: pruss instance
+ * @pru_id: PRU identifier (0-1)
+ * @mux: new mux value for PRU
+ */
+static inline int pruss_cfg_set_gpmux(struct pruss *pruss,
+				      enum pruss_pru_id id, u8 mux)
+{
+	if (mux >= PRUSS_GP_MUX_SEL_MAX)
+		return -EINVAL;
+
+	return pruss_cfg_update(pruss, PRUSS_CFG_GPCFG(id),
+				PRUSS_GPCFG_PRU_MUX_SEL_MASK,
+				(u32)mux << PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
+}
+
+/**
+ * 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.
+ */
+static inline 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);
+}
+
+/**
+ * pruss_cfg_xfr_enable() - Enable/disable XIN XOUT shift functionality
+ * @pruss: the pruss instance
+ * @enable: enable/disable
+ */
+static inline int pruss_cfg_xfr_enable(struct pruss *pruss, bool enable)
+{
+	u32 set = enable ? PRUSS_SPP_XFER_SHIFT_EN : 0;
+
+	return pruss_cfg_update(pruss, PRUSS_CFG_SPP,
+				PRUSS_SPP_XFER_SHIFT_EN, set);
+}
 #else
 
 static inline struct pruss *pruss_get(struct rproc *rproc)
@@ -254,6 +317,28 @@ int pruss_intc_unconfigure(struct pruss *pruss,
 	return -ENOTSUPP;
 }
 
+static inline int pruss_cfg_get_gpmux(struct pruss *pruss,
+				      enum pruss_pru_id id, u8 *mux)
+{
+	return -ENOTSUPP;
+}
+
+static inline int pruss_cfg_set_gpmux(struct pruss *pruss,
+				      enum pruss_pru_id id, u8 mux)
+{
+	return -ENOTSUPP;
+}
+
+static inline int pruss_cfg_miirt_enable(struct pruss *pruss, bool enable)
+{
+	return -ENOTSUPP;
+}
+
+static inline int pruss_cfg_xfr_enable(struct pruss *pruss, bool enable)
+{
+	return -ENOTSUPP;
+}
+
 #endif /* CONFIG_TI_PRUSS */
 
 #if IS_ENABLED(CONFIG_PRUSS_REMOTEPROC)
@@ -263,6 +348,30 @@ void pru_rproc_put(struct rproc *rproc);
 enum pruss_pru_id pru_rproc_get_id(struct rproc *rproc);
 int pru_rproc_set_ctable(struct rproc *rproc, enum pru_ctable_idx c, u32 addr);
 
+/**
+ * pruss_cfg_gpimode() - set the GPI mode of the PRU
+ * @pruss: the pruss instance handle
+ * @pru: the rproc instance handle of the PRU
+ * @mode: GPI mode to set
+ *
+ * Sets the GPI mode for a given PRU by programming the
+ * corresponding PRUSS_CFG_GPCFGx register
+ *
+ * Returns 0 on success, or an error code otherwise
+ */
+static inline int pruss_cfg_gpimode(struct pruss *pruss, struct rproc *pru,
+				    enum pruss_gpi_mode mode)
+{
+	enum pruss_pru_id id = pru_rproc_get_id(pru);
+
+	if (id < 0)
+		return -EINVAL;
+
+	return pruss_cfg_update(pruss, PRUSS_CFG_GPCFG(id),
+				PRUSS_GPCFG_PRU_GPI_MODE_MASK,
+				mode << PRUSS_GPCFG_PRU_GPI_MODE_SHIFT);
+}
+
 #else
 
 static inline struct rproc *pru_rproc_get(struct device_node *node, int index)
@@ -283,6 +392,12 @@ static inline int pru_rproc_set_ctable(struct rproc *rproc,
 	return -ENOTSUPP;
 }
 
+static inline int pruss_cfg_gpimode(struct pruss *pruss, struct rproc *pru,
+				    enum pruss_gpi_mode mode)
+{
+	return -ENOTSUPP;
+}
+
 #endif /* CONFIG_PRUSS_REMOTEPROC */
 
 #endif /* __LINUX_PRUSS_H */
-- 
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