[PATCH v9 3/4] soc: ti: pruss: Add pruss_cfg_read()/update(), pruss_cfg_get_gpmux()/set_gpmux() APIs
From: MD Danish Anwar
Date: Fri Apr 14 2023 - 00:57:05 EST
From: Suman Anna <s-anna@xxxxxx>
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@xxxxxx>
Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@xxxxxxxxxx>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@xxxxxxxxxx>
Signed-off-by: Puranjay Mohan <p-mohan@xxxxxx>
Reviewed-by: Roger Quadros <rogerq@xxxxxxxxxx>
Reviewed-by: Tony Lindgren <tony@xxxxxxxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Acked-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: MD Danish Anwar <danishanwar@xxxxxx>
---
drivers/soc/ti/pruss.c | 45 ++++++++++++++++++
drivers/soc/ti/pruss.h | 88 ++++++++++++++++++++++++++++++++++++
include/linux/pruss_driver.h | 32 +++++++++++++
3 files changed, 165 insertions(+)
create mode 100644 drivers/soc/ti/pruss.h
diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
index 8ada3758b31a..4ad6ccb039c8 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@xxxxxx>
+ */
+
+#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_ */
diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_driver.h
index c8f2e53b911b..5bb8897724a9 100644
--- a/include/linux/pruss_driver.h
+++ b/include/linux/pruss_driver.h
@@ -14,6 +14,24 @@
#include <linux/types.h>
#include <linux/err.h>
+/*
+ * enum pruss_gp_mux_sel - PRUSS GPI/O Mux modes for the
+ * PRUSS_GPCFG0/1 registers
+ *
+ * NOTE: The below defines are the most common values, but there
+ * are some exceptions like on 66AK2G, where the RESERVED and MII2
+ * values are interchanged. Also, this bit-field does not exist on
+ * AM335x SoCs
+ */
+enum pruss_gp_mux_sel {
+ PRUSS_GP_MUX_SEL_GP,
+ PRUSS_GP_MUX_SEL_ENDAT,
+ PRUSS_GP_MUX_SEL_RESERVED,
+ PRUSS_GP_MUX_SEL_SD,
+ PRUSS_GP_MUX_SEL_MII2,
+ PRUSS_GP_MUX_SEL_MAX,
+};
+
/*
* enum pruss_mem - PRUSS memory range identifiers
*/
@@ -66,6 +84,8 @@ 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_get_gpmux(struct pruss *pruss, enum pruss_pru_id pru_id, u8 *mux);
+int pruss_cfg_set_gpmux(struct pruss *pruss, enum pruss_pru_id pru_id, u8 mux);
#else
@@ -89,6 +109,18 @@ static inline int pruss_release_mem_region(struct pruss *pruss,
return -EOPNOTSUPP;
}
+static inline int pruss_cfg_get_gpmux(struct pruss *pruss,
+ enum pruss_pru_id pru_id, u8 *mux)
+{
+ return ERR_PTR(-EOPNOTSUPP);
+}
+
+static inline int pruss_cfg_set_gpmux(struct pruss *pruss,
+ enum pruss_pru_id pru_id, u8 mux)
+{
+ return ERR_PTR(-EOPNOTSUPP);
+}
+
#endif /* CONFIG_TI_PRUSS */
#endif /* _PRUSS_DRIVER_H_ */
--
2.34.1