[PATCH v5 5/5] soc: ti: pruss: Add helper functions to get/set PRUSS_CFG_GPMUX
From: MD Danish Anwar <danishanwar@ti.com>
Date: 2023-03-23 06:26:15
Also in:
linux-arm-kernel, linux-devicetree, linux-omap, linux-remoteproc, lkml
Subsystem:
remote processor (remoteproc) subsystem, the rest, ti keystone multicore navigator drivers · Maintainers:
Bjorn Andersson, Mathieu Poirier, Linus Torvalds, Nishanth Menon, Santosh Shilimkar
From: Tero Kristo <redacted> 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 <redacted> Signed-off-by: Suman Anna <redacted> Signed-off-by: Tero Kristo <redacted> Co-developed-by: Grzegorz Jaszczyk <redacted> Signed-off-by: Grzegorz Jaszczyk <redacted> Signed-off-by: Puranjay Mohan <redacted> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> Reviewed-by: Roger Quadros <rogerq@kernel.org> --- drivers/soc/ti/pruss.c | 44 ++++++++++++++++++++++++++++++++ include/linux/remoteproc/pruss.h | 30 ++++++++++++++++++++++ 2 files changed, 74 insertions(+)
diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
index ac415442e85b..3aa3c38c6c79 100644
--- a/drivers/soc/ti/pruss.c
+++ b/drivers/soc/ti/pruss.c@@ -239,6 +239,50 @@ int pruss_cfg_xfr_enable(struct pruss *pruss, enum pru_type pru_type, } EXPORT_SYMBOL_GPL(pruss_cfg_xfr_enable); +/** + * 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 = 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; +} +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 < 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); +} +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/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h
index bb001f712980..42f1586c62ac 100644
--- a/include/linux/remoteproc/pruss.h
+++ b/include/linux/remoteproc/pruss.h@@ -16,6 +16,24 @@ #define PRU_RPROC_DRVNAME "pru-rproc" +/* + * 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 = 0, + 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_gpi_mode - PRUSS GPI configuration modes, used * to program the PRUSS_GPCFG0/1 registers
@@ -110,6 +128,8 @@ int pruss_cfg_gpimode(struct pruss *pruss, enum pruss_pru_id pru_id, int pruss_cfg_miirt_enable(struct pruss *pruss, bool enable); int pruss_cfg_xfr_enable(struct pruss *pruss, enum pru_type pru_type, bool enable); +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
@@ -152,6 +172,16 @@ static inline int pruss_cfg_xfr_enable(struct pruss *pruss, return ERR_PTR(-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 */ #if IS_ENABLED(CONFIG_PRU_REMOTEPROC)
--
2.25.1