linux-kernel - [PATCH 6/6] soc: ti: pruss: Add helper functions to get/set PRUSS_CFG

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Message-Id: <20201211184811.6490-7-grzegorz.jaszczyk@linaro.org>
Date:   Fri, 11 Dec 2020 19:48:11 +0100
From:   Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
To:     ssantosh@...nel.org, s-anna@...com
Cc:     grzegorz.jaszczyk@...aro.org, santosh.shilimkar@...cle.com,
        lee.jones@...aro.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        praneeth@...com, tony@...mide.com,
        linux-remoteproc@...r.kernel.org, mathieu.poirier@...aro.org
Subject: [PATCH 6/6] soc: ti: pruss: Add helper functions to get/set PRUSS_CFG_GPMUX

From: Tero Kristo <t-kristo@...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@...com>
Signed-off-by: Suman Anna <s-anna@...com>
Signed-off-by: Tero Kristo <t-kristo@...com>
Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
---
 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_ */
-- 
2.29.0