[PATCH v2 6/6] soc: ti: pruss: Add helper functions to get/set PRUSS_CFG_GPMUX

Puranjay Mohan
2022-04-18T12:37:54Z

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

Add two new helper functions pruss_cfg_get_gpmux() & pruss_cfg_set_gpmux()
to get and set the GP MUX mode for programming the PRUSS internal wrapper
mux functionality as needed by usecases.

Co-developed-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Signed-off-by: Puranjay Mohan <p-mohan@ti.com>
---
include/linux/pruss_driver.h | 44 ++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)

diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_driver.h
index e2d5477225c6..3312281ef4c1 100644
--- a/include/linux/pruss_driver.h
+++ b/include/linux/pruss_driver.h
@@ -35,4 +35,48 @@ struct pruss {
struct clk *iep_clk_mux;
};

+/**
+ * pruss_cfg_get_gpmux() - get the current GPMUX value for a PRU device
+ * @pruss: pruss instance
+ * @pru_id: PRU identifier (0-1)
+ * @mux: pointer to store the current mux value into
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+static inline int pruss_cfg_get_gpmux(struct pruss *pruss,
+ enum pruss_pru_id pru_id, u8 *mux)
+{
+ int ret = 0;
+ u32 val;
+
+ if (pru_id < 0 || pru_id >= PRUSS_NUM_PRUS)
+ return -EINVAL;
+
+ ret = pruss_cfg_read(pruss, PRUSS_CFG_GPCFG(pru_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
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+static inline int pruss_cfg_set_gpmux(struct pruss *pruss,
+ enum pruss_pru_id pru_id, u8 mux)
+{
+ if (mux >= PRUSS_GP_MUX_SEL_MAX ||
+ pru_id < 0 || pru_id >= PRUSS_NUM_PRUS)
+ return -EINVAL;
+
+ return pruss_cfg_update(pruss, PRUSS_CFG_GPCFG(pru_id),
+ PRUSS_GPCFG_PRU_MUX_SEL_MASK,
+ (u32)mux << PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
+}
+
#endif /* _PRUSS_DRIVER_H_ */
--
2.17.1