From: Peng Fan <peng.fan@xxxxxxx>
scmi-pinctrl driver implements pinctrl driver interface and using
SCMI protocol to redirect messages from pinctrl subsystem SDK to
SCMI platform firmware, which does the changes in HW.
Co-developed-by: Oleksii Moisieiev <oleksii_moisieiev@xxxxxxxx>
Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@xxxxxxxx>
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
MAINTAINERS | 1 +
drivers/pinctrl/Kconfig | 11 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-scmi.c | 524 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 537 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 487bff0d44c0..3fe790e90834 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -21314,6 +21314,7 @@ F: drivers/clk/clk-sc[mp]i.c
F: drivers/cpufreq/sc[mp]i-cpufreq.c
F: drivers/firmware/arm_scmi/
F: drivers/firmware/arm_scpi.c
+F: drivers/pinctrl/pinctrl-scmi.c
F: drivers/pmdomain/arm/
F: drivers/powercap/arm_scmi_powercap.c
F: drivers/regulator/scmi-regulator.c
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 8163a5983166..27b26e428f60 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -432,6 +432,17 @@ config PINCTRL_ROCKCHIP
help
This support pinctrl and GPIO driver for Rockchip SoCs.
+config PINCTRL_SCMI
+ tristate "Pinctrl driver using SCMI protocol interface"
+ depends on ARM_SCMI_PROTOCOL || COMPILE_TEST
+ select PINMUX
+ select GENERIC_PINCONF
+ help
+ This driver provides support for pinctrl which is controlled
+ by firmware that implements the SCMI interface.
+ It uses SCMI Message Protocol to interact with the
+ firmware providing all the pinctrl controls.
+
config PINCTRL_SINGLE
tristate "One-register-per-pin type device tree based pinctrl driver"
depends on OF
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 1071f301cc70..ba755ed2d46c 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_PINCTRL_PIC32) += pinctrl-pic32.o
obj-$(CONFIG_PINCTRL_PISTACHIO) += pinctrl-pistachio.o
obj-$(CONFIG_PINCTRL_RK805) += pinctrl-rk805.o
obj-$(CONFIG_PINCTRL_ROCKCHIP) += pinctrl-rockchip.o
+obj-$(CONFIG_PINCTRL_SCMI) += pinctrl-scmi.o
obj-$(CONFIG_PINCTRL_SINGLE) += pinctrl-single.o
obj-$(CONFIG_PINCTRL_ST) += pinctrl-st.o
obj-$(CONFIG_PINCTRL_STMFX) += pinctrl-stmfx.o
diff --git a/drivers/pinctrl/pinctrl-scmi.c b/drivers/pinctrl/pinctrl-scmi.c
new file mode 100644
index 000000000000..146308d27f54
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-scmi.c
@@ -0,0 +1,524 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Power Interface (SCMI) Protocol based pinctrl driver
+ *
+ * Copyright (C) 2023 EPAM
+ * Copyright 2023 NXP
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/scmi_protocol.h>
+#include <linux/slab.h>
+
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+
+#include "pinctrl-utils.h"
+#include "core.h"
+#include "pinconf.h"
+
+#define DRV_NAME "scmi-pinctrl"
+
+static const struct scmi_pinctrl_proto_ops *pinctrl_ops;
+
+struct scmi_pinctrl_funcs {
+ unsigned int num_groups;
+ const char **groups;
+};
+
+struct scmi_pinctrl {
+ struct device *dev;
+ struct scmi_protocol_handle *ph;
+ struct pinctrl_dev *pctldev;
+ struct pinctrl_desc pctl_desc;
+ struct scmi_pinctrl_funcs *functions;
+ unsigned int nr_functions;
+ char **groups;
+ unsigned int nr_groups;
+ struct pinctrl_pin_desc *pins;
+ unsigned int nr_pins;
+ u8 *config_type;
+ u32 *config_value;
+};
+
+static int pinctrl_scmi_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pinctrl_ops->count_get(pmx->ph, GROUP_TYPE);
+}
+
+static const char *pinctrl_scmi_get_group_name(struct pinctrl_dev *pctldev, unsigned int selector)
+{
+ int ret;
+ const char *name;
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ ret = pinctrl_ops->name_get(pmx->ph, selector, GROUP_TYPE, &name);
+ if (ret) {
+ dev_err(pmx->dev, "get name failed with err %d", ret);
+ return NULL;
+ }
+
+ return name;
+}
+
+static int pinctrl_scmi_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int selector,
+ const unsigned int **pins,
+ unsigned int *num_pins)
+{
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pinctrl_ops->group_pins_get(pmx->ph, selector, pins, num_pins);
+}
+
+static const struct pinctrl_ops pinctrl_scmi_pinctrl_ops = {
+ .get_groups_count = pinctrl_scmi_get_groups_count,
+ .get_group_name = pinctrl_scmi_get_group_name,
+ .get_group_pins = pinctrl_scmi_get_group_pins,
+#ifdef CONFIG_OF
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
+ .dt_free_map = pinconf_generic_dt_free_map,
+#endif
+};
+
+static int pinctrl_scmi_get_functions_count(struct pinctrl_dev *pctldev)
+{
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pinctrl_ops->count_get(pmx->ph, FUNCTION_TYPE);
+}
+
+static const char *pinctrl_scmi_get_function_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ int ret;
+ const char *name;
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ ret = pinctrl_ops->name_get(pmx->ph, selector, FUNCTION_TYPE, &name);
+ if (ret) {
+ dev_err(pmx->dev, "get name failed with err %d", ret);
+ return NULL;
+ }
+
+ return name;
+}
+
+static int pinctrl_scmi_get_function_groups(struct pinctrl_dev *pctldev,
+ unsigned int selector,
+ const char * const **groups,
+ unsigned int * const num_groups)
+{
+ const unsigned int *group_ids;
+ int ret, i;
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!groups || !num_groups)
+ return -EINVAL;
+
+ if (selector < pmx->nr_functions &&
+ pmx->functions[selector].num_groups) {
+ *groups = (const char * const *)pmx->functions[selector].groups;
+ *num_groups = pmx->functions[selector].num_groups;
+ return 0;
+ }
+
+ ret = pinctrl_ops->function_groups_get(pmx->ph, selector,
+ &pmx->functions[selector].num_groups,
+ &group_ids);
+ if (ret) {
+ dev_err(pmx->dev, "Unable to get function groups, err %d", ret);
+ return ret;
+ }
+
+ *num_groups = pmx->functions[selector].num_groups;
+ if (!*num_groups)
+ return -EINVAL;
+
+ pmx->functions[selector].groups =
+ devm_kcalloc(pmx->dev, *num_groups, sizeof(*pmx->functions[selector].groups),
+ GFP_KERNEL);
+ if (!pmx->functions[selector].groups)
+ return -ENOMEM;
+
+ for (i = 0; i < *num_groups; i++) {
+ pmx->functions[selector].groups[i] =
+ pinctrl_scmi_get_group_name(pmx->pctldev,
+ group_ids[i]);
+ if (!pmx->functions[selector].groups[i]) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
+ }
+
+ *groups = (const char * const *)pmx->functions[selector].groups;
+
+ return 0;
+
+err_free:
+ devm_kfree(pmx->dev, pmx->functions[selector].groups);
+
+ return ret;
+}
+
+static int pinctrl_scmi_func_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
+ unsigned int group)
+{
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pinctrl_ops->mux_set(pmx->ph, selector, group);
+}
+
+static int pinctrl_scmi_request(struct pinctrl_dev *pctldev, unsigned int offset)
+{
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pinctrl_ops->pin_request(pmx->ph, offset);
+}
+
+static int pinctrl_scmi_free(struct pinctrl_dev *pctldev, unsigned int offset)
+{
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pinctrl_ops->pin_free(pmx->ph, offset);
+}
+
+static const struct pinmux_ops pinctrl_scmi_pinmux_ops = {
+ .request = pinctrl_scmi_request,
+ .free = pinctrl_scmi_free,
+ .get_functions_count = pinctrl_scmi_get_functions_count,
+ .get_function_name = pinctrl_scmi_get_function_name,
+ .get_function_groups = pinctrl_scmi_get_function_groups,
+ .set_mux = pinctrl_scmi_func_set_mux,
+};
+
+static int pinctrl_scmi_map_pinconf_type(enum pin_config_param param, u8 *type)
+{
+ u8 arg = param;
+
+ switch (arg) {
+ case PIN_CONFIG_BIAS_BUS_HOLD:
+ *type = SCMI_PIN_BIAS_BUS_HOLD;
+ break;
+ case PIN_CONFIG_BIAS_DISABLE:
+ *type = SCMI_PIN_BIAS_DISABLE;
+ break;
+ case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+ *type = SCMI_PIN_BIAS_HIGH_IMPEDANCE;
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ *type = SCMI_PIN_BIAS_PULL_DOWN;
+ break;
+ case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
+ *type = SCMI_PIN_BIAS_PULL_DEFAULT;
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ *type = SCMI_PIN_BIAS_PULL_UP;
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ *type = SCMI_PIN_DRIVE_OPEN_DRAIN;
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_SOURCE:
+ *type = SCMI_PIN_DRIVE_OPEN_SOURCE;
+ break;
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ *type = SCMI_PIN_DRIVE_PUSH_PULL;
+ break;
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ *type = SCMI_PIN_DRIVE_STRENGTH;
+ break;
+ case PIN_CONFIG_DRIVE_STRENGTH_UA:
+ *type = SCMI_PIN_DRIVE_STRENGTH;
+ break;
+ case PIN_CONFIG_INPUT_DEBOUNCE:
+ *type = SCMI_PIN_INPUT_DEBOUNCE;
+ break;
+ case PIN_CONFIG_INPUT_ENABLE:
+ *type = SCMI_PIN_INPUT_MODE;
+ break;
+ case PIN_CONFIG_INPUT_SCHMITT:
+ *type = SCMI_PIN_INPUT_SCHMITT;
+ break;
+ case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+ *type = SCMI_PIN_INPUT_MODE;
+ break;
+ case PIN_CONFIG_MODE_LOW_POWER:
+ *type = SCMI_PIN_LOW_POWER_MODE;
+ break;
+ case PIN_CONFIG_OUTPUT:
+ *type = SCMI_PIN_OUTPUT_VALUE;
+ break;
+ case PIN_CONFIG_OUTPUT_ENABLE:
+ *type = SCMI_PIN_OUTPUT_MODE;
+ break;
+ case PIN_CONFIG_OUTPUT_IMPEDANCE_OHMS:
+ *type = SCMI_PIN_OUTPUT_VALUE;
+ break;
+ case PIN_CONFIG_POWER_SOURCE:
+ *type = SCMI_PIN_POWER_SOURCE;
+ break;
+ case PIN_CONFIG_SLEW_RATE:
+ *type = SCMI_PIN_SLEW_RATE;
+ break;
+ case SCMI_PIN_OEM_START ... SCMI_PIN_OEM_END:
+ *type = param;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+static int pinctrl_scmi_pinconf_get(struct pinctrl_dev *pctldev, unsigned int _pin,
+ unsigned long *config)
+{
+ int ret;
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param config_type;
+ u32 config_value;
+ u8 type;
+
+ if (!config)
+ return -EINVAL;
+
+ config_type = pinconf_to_config_param(*config);
+
+ ret = pinctrl_scmi_map_pinconf_type(config_type, &type);
+ if (ret) {
+ dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
+ return ret;
+ }
+
+ ret = pinctrl_ops->config_get(pmx->ph, _pin, PIN_TYPE, type, &config_value);
+ if (ret)
+ return ret;
+
+ *config = pinconf_to_config_packed(config_type, config_value);
+
+ return 0;
+}
+
+static int pinctrl_scmi_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned int _pin,
+ unsigned long *configs,
+ unsigned int num_configs)
+{
+ int i, ret;
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!configs || !num_configs)
+ return -EINVAL;
+
+ for (i = 0; i < num_configs; i++) {
+ ret = pinctrl_scmi_map_pinconf_type(pinconf_to_config_param(configs[i]),
+ &pmx->config_type[i]);
+ if (ret) {
+ dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
+ return ret;
+ }
+ pmx->config_value[i] = pinconf_to_config_argument(configs[i]);
+ }
+
+ ret = pinctrl_ops->config_set(pmx->ph, _pin, PIN_TYPE, num_configs,
+ pmx->config_type, pmx->config_value);
+ if (ret)
+ dev_err(pmx->dev, "Error parsing config %d\n", ret);
+
+ return ret;
+}
+
+static int pinctrl_scmi_pinconf_group_set(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ unsigned long *configs,
+ unsigned int num_configs)
+{
+ int i, ret;
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!configs || !num_configs)
+ return -EINVAL;
+
+ for (i = 0; i < num_configs; i++) {
+ ret = pinctrl_scmi_map_pinconf_type(pinconf_to_config_param(configs[i]),
+ &pmx->config_type[i]);
+ if (ret) {
+ dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
+ return ret;
+ }
+ pmx->config_value[i] = pinconf_to_config_argument(configs[i]);
+ }
+
+ ret = pinctrl_ops->config_set(pmx->ph, group, GROUP_TYPE, num_configs,
+ pmx->config_type, pmx->config_value);
+ if (ret)
+ dev_err(pmx->dev, "Error parsing config %d", ret);
+
+ return ret;
+};
+
+static int pinctrl_scmi_pinconf_group_get(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ unsigned long *config)
+{
+ int ret;
+ struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param config_type;
+ u32 config_value;
+ u8 type;
+
+ if (!config)
+ return -EINVAL;
+
+ config_type = pinconf_to_config_param(*config);
+ ret = pinctrl_scmi_map_pinconf_type(config_type, &type);
+
+ ret = pinctrl_ops->config_get(pmx->ph, group, GROUP_TYPE, type, &config_value);
+ if (ret)
+ return ret;
+
+ *config = pinconf_to_config_packed(config_type, config_value);
+
+ return 0;
+}
+
+static const struct pinconf_ops pinctrl_scmi_pinconf_ops = {
+ .is_generic = true,
+ .pin_config_get = pinctrl_scmi_pinconf_get,
+ .pin_config_set = pinctrl_scmi_pinconf_set,
+ .pin_config_group_set = pinctrl_scmi_pinconf_group_set,
+ .pin_config_group_get = pinctrl_scmi_pinconf_group_get,
+ .pin_config_config_dbg_show = pinconf_generic_dump_config,
+};
+
+static int pinctrl_scmi_get_pins(struct scmi_pinctrl *pmx,
+ unsigned int *nr_pins,
+ const struct pinctrl_pin_desc **pins)
+{
+ int ret, i;
+
+ if (!pins || !nr_pins)
+ return -EINVAL;
+
+ if (pmx->nr_pins) {
+ *pins = pmx->pins;
+ *nr_pins = pmx->nr_pins;
+ return 0;
+ }
+
+ *nr_pins = pinctrl_ops->count_get(pmx->ph, PIN_TYPE);
+
+ pmx->nr_pins = *nr_pins;
+ pmx->pins = devm_kmalloc_array(pmx->dev, *nr_pins, sizeof(*pmx->pins), GFP_KERNEL);
+ if (!pmx->pins)
+ return -ENOMEM;
+
+ for (i = 0; i < *nr_pins; i++) {
+ pmx->pins[i].number = i;
+ ret = pinctrl_ops->name_get(pmx->ph, i, PIN_TYPE, &pmx->pins[i].name);
+ if (ret) {
+ dev_err(pmx->dev, "Can't get name for pin %d: rc %d", i, ret);
+ pmx->nr_pins = 0;
+ return ret;
+ }
+ }
+
+ *pins = pmx->pins;
+ dev_dbg(pmx->dev, "got pins %d", *nr_pins);
+
+ return 0;
+}
+
+static const struct scmi_device_id scmi_id_table[] = {
+ { SCMI_PROTOCOL_PINCTRL, "pinctrl" },
+ { }
+};
+MODULE_DEVICE_TABLE(scmi, scmi_id_table);
+
+static int scmi_pinctrl_probe(struct scmi_device *sdev)
+{
+ int ret;
+ struct device *dev = &sdev->dev;
+ struct scmi_pinctrl *pmx;
+ const struct scmi_handle *handle;
+ struct scmi_protocol_handle *ph;
+
+ if (!sdev || !sdev->handle)
+ return -EINVAL;
+
+ handle = sdev->handle;
+
+ pinctrl_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_PINCTRL, &ph);
+ if (IS_ERR(pinctrl_ops))
+ return PTR_ERR(pinctrl_ops);
+
+ pmx = devm_kzalloc(dev, sizeof(*pmx), GFP_KERNEL);
+ if (!pmx)
+ return -ENOMEM;
+
+ pmx->config_type = devm_kzalloc(dev, SZ_4K, GFP_KERNEL);
+ if (!pmx->config_type)
+ return -ENOMEM;
+
+ pmx->config_value = devm_kzalloc(dev, SZ_4K, GFP_KERNEL);
+ if (!pmx->config_value)
+ return -ENOMEM;
+
+ pmx->ph = ph;
+
+ pmx->dev = dev;
+ pmx->pctl_desc.name = DRV_NAME;
+ pmx->pctl_desc.owner = THIS_MODULE;
+ pmx->pctl_desc.pctlops = &pinctrl_scmi_pinctrl_ops;
+ pmx->pctl_desc.pmxops = &pinctrl_scmi_pinmux_ops;
+ pmx->pctl_desc.confops = &pinctrl_scmi_pinconf_ops;
+
+ ret = pinctrl_scmi_get_pins(pmx, &pmx->pctl_desc.npins,
+ &pmx->pctl_desc.pins);
+ if (ret)
+ return ret;
+
+ ret = devm_pinctrl_register_and_init(dev, &pmx->pctl_desc, pmx, &pmx->pctldev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to register pinctrl\n");
+
+ pmx->nr_functions = pinctrl_scmi_get_functions_count(pmx->pctldev);
+ pmx->nr_groups = pinctrl_scmi_get_groups_count(pmx->pctldev);
+
+ if (pmx->nr_functions) {
+ pmx->functions =
+ devm_kcalloc(dev, pmx->nr_functions, sizeof(*pmx->functions),
+ GFP_KERNEL);
+ if (!pmx->functions)
+ return -ENOMEM;
+ }
+
+ if (pmx->nr_groups) {
+ pmx->groups =
+ devm_kcalloc(dev, pmx->nr_groups, sizeof(*pmx->groups), GFP_KERNEL);
+ if (!pmx->groups)
+ return -ENOMEM;
+ }
+
+ return pinctrl_enable(pmx->pctldev);
+}
+
+static struct scmi_driver scmi_pinctrl_driver = {
+ .name = DRV_NAME,
+ .probe = scmi_pinctrl_probe,
+ .id_table = scmi_id_table,
+};
+module_scmi_driver(scmi_pinctrl_driver);
+
+MODULE_AUTHOR("Oleksii Moisieiev <oleksii_moisieiev@xxxxxxxx>");
+MODULE_AUTHOR("Peng Fan <peng.fan@xxxxxxx>");
+MODULE_DESCRIPTION("ARM SCMI pin controller driver");
+MODULE_LICENSE("GPL");
--
2.37.1
