soc: ti: pruss: Add pruss_cfg_read()/update(), pruss_cfg_get_gpmux()/set_gpmux() APIs

Add two new generic API pruss_cfg_read() and pruss_cfg_update() to
the PRUSS platform driver to read and program respectively a register
within the PRUSS CFG sub-module represented by a syscon driver. These
APIs are internal to PRUSS driver.

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.

Various useful registers and macros for certain register bit-fields and
their values have also been added.

Signed-off-by: Suman Anna <s-anna@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>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
Link: https://lore.kernel.org/r/20230414045542.3249939-4-danishanwar@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>

2 files changed, 133 insertions, 0 deletions

diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
index df5eb4d959f8..2c44913c083b 100644
--- a/drivers/soc/ti/pruss.c
+++ b/drivers/soc/ti/pruss.c
@@ -21,6 +21,7 @@
 #include <linux/regmap.h>
 #include <linux/remoteproc.h>
 #include <linux/slab.h>
+#include "pruss.h"
 
 /**
  * struct pruss_private_data - PRUSS driver private data
@@ -168,6 +169,50 @@ int pruss_release_mem_region(struct pruss *pruss,
 }
 EXPORT_SYMBOL_GPL(pruss_release_mem_region);
 
+/**
+ * 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
+ */
+int pruss_cfg_get_gpmux(struct pruss *pruss, enum pruss_pru_id pru_id, u8 *mux)
+{
+	int ret;
+	u32 val;
+
+	if (pru_id >= PRUSS_NUM_PRUS || !mux)
+		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;
+}
+EXPORT_SYMBOL_GPL(pruss_cfg_get_gpmux);
+
+/**
+ * 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
+ */
+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 >= 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);
+}
+EXPORT_SYMBOL_GPL(pruss_cfg_set_gpmux);
+
 static void pruss_of_free_clk_provider(void *data)
 {
 	struct device_node *clk_mux_np = data;
diff --git a/drivers/soc/ti/pruss.h b/drivers/soc/ti/pruss.h
new file mode 100644
index 000000000000..6c55987e0e55
--- /dev/null
+++ b/drivers/soc/ti/pruss.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * PRU-ICSS Subsystem user interfaces
+ *
+ * Copyright (C) 2015-2023 Texas Instruments Incorporated - http://www.ti.com
+ *	MD Danish Anwar <danishanwar@ti.com>
+ */
+
+#ifndef _SOC_TI_PRUSS_H_
+#define _SOC_TI_PRUSS_H_
+
+#include <linux/bits.h>
+#include <linux/regmap.h>
+
+/*
+ * PRU_ICSS_CFG registers
+ * SYSCFG, ISRP, ISP, IESP, IECP, SCRP applicable on AMxxxx devices only
+ */
+#define PRUSS_CFG_REVID         0x00
+#define PRUSS_CFG_SYSCFG        0x04
+#define PRUSS_CFG_GPCFG(x)      (0x08 + (x) * 4)
+#define PRUSS_CFG_CGR           0x10
+#define PRUSS_CFG_ISRP          0x14
+#define PRUSS_CFG_ISP           0x18
+#define PRUSS_CFG_IESP          0x1C
+#define PRUSS_CFG_IECP          0x20
+#define PRUSS_CFG_SCRP          0x24
+#define PRUSS_CFG_PMAO          0x28
+#define PRUSS_CFG_MII_RT        0x2C
+#define PRUSS_CFG_IEPCLK        0x30
+#define PRUSS_CFG_SPP           0x34
+#define PRUSS_CFG_PIN_MX        0x40
+
+/* PRUSS_GPCFG register bits */
+#define PRUSS_GPCFG_PRU_GPI_MODE_MASK           GENMASK(1, 0)
+#define PRUSS_GPCFG_PRU_GPI_MODE_SHIFT          0
+
+#define PRUSS_GPCFG_PRU_MUX_SEL_SHIFT           26
+#define PRUSS_GPCFG_PRU_MUX_SEL_MASK            GENMASK(29, 26)
+
+/* PRUSS_MII_RT register bits */
+#define PRUSS_MII_RT_EVENT_EN                   BIT(0)
+
+/* PRUSS_SPP register bits */
+#define PRUSS_SPP_XFER_SHIFT_EN                 BIT(1)
+#define PRUSS_SPP_PRU1_PAD_HP_EN                BIT(0)
+#define PRUSS_SPP_RTU_XFR_SHIFT_EN              BIT(3)
+
+/**
+ * pruss_cfg_read() - read a PRUSS CFG sub-module register
+ * @pruss: the pruss instance handle
+ * @reg: register offset within the CFG sub-module
+ * @val: pointer to return the value in
+ *
+ * Reads a given register within the PRUSS CFG sub-module and
+ * returns it through the passed-in @val pointer
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+static int pruss_cfg_read(struct pruss *pruss, unsigned int reg, unsigned int *val)
+{
+	if (IS_ERR_OR_NULL(pruss))
+		return -EINVAL;
+
+	return regmap_read(pruss->cfg_regmap, reg, val);
+}
+
+/**
+ * pruss_cfg_update() - configure a PRUSS CFG sub-module register
+ * @pruss: the pruss instance handle
+ * @reg: register offset within the CFG sub-module
+ * @mask: bit mask to use for programming the @val
+ * @val: value to write
+ *
+ * Programs a given register within the PRUSS CFG sub-module
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+static int pruss_cfg_update(struct pruss *pruss, unsigned int reg,
+			    unsigned int mask, unsigned int val)
+{
+	if (IS_ERR_OR_NULL(pruss))
+		return -EINVAL;
+
+	return regmap_update_bits(pruss->cfg_regmap, reg, mask, val);
+}
+
+#endif  /* _SOC_TI_PRUSS_H_ */