@@ -16966,6 +16966,7 @@ M: Oleksii Moisieiev <oleksii_moisieiev@epam.com>
L: linux-arm-kernel@lists.infradead.org
S: Maintained
F: drivers/firmware/arm_scmi/pinctrl.c
+F: drivers/pinctrl/pinctrl-scmi.c
SYSTEM RESET/SHUTDOWN DRIVERS
M: Sebastian Reichel <sre@kernel.org>
@@ -47,6 +47,7 @@ obj-$(CONFIG_PINCTRL_INGENIC) += pinctrl-ingenic.o
obj-$(CONFIG_PINCTRL_RK805) += pinctrl-rk805.o
obj-$(CONFIG_PINCTRL_OCELOT) += pinctrl-ocelot.o
obj-$(CONFIG_PINCTRL_EQUILIBRIUM) += pinctrl-equilibrium.o
+obj-$(CONFIG_PINCTRL_SCMI) += pinctrl-scmi.o
obj-y += actions/
obj-$(CONFIG_ARCH_ASPEED) += aspeed/
new file mode 100644
@@ -0,0 +1,555 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Power Interface (SCMI) Protocol based clock driver
+ *
+ * Copyright (C) 2021 EPAM.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/module.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 <linux/scmi_protocol.h>
+#include <linux/slab.h>
+
+#include "pinctrl-utils.h"
+#include "core.h"
+#include "pinconf.h"
+
+#define DRV_NAME "scmi-pinctrl"
+
+struct scmi_pinctrl_funcs {
+ unsigned int num_groups;
+ const char **groups;
+};
+
+struct scmi_pinctrl {
+ struct device *dev;
+ struct scmi_handle *handle;
+ 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;
+};
+
+static int pinctrl_scmi_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ return handle->pinctrl_ops->get_groups_count(handle);
+}
+
+static const char *pinctrl_scmi_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ int ret;
+ const char *name;
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return NULL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle)
+ return NULL;
+
+ handle = pmx->handle;
+
+ ret = handle->pinctrl_ops->get_group_name(handle, selector, &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)
+{
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ return handle->pinctrl_ops->get_group_pins(handle, selector,
+ pins, num_pins);
+}
+
+static void pinctrl_scmi_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned int offset)
+{
+ seq_puts(s, DRV_NAME);
+}
+
+#ifdef CONFIG_OF
+static int pinctrl_scmi_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map,
+ u32 *num_maps)
+{
+ return pinconf_generic_dt_node_to_map(pctldev, np_config, map,
+ num_maps, PIN_MAP_TYPE_INVALID);
+}
+
+static void pinctrl_scmi_dt_free_map(struct pinctrl_dev *pctldev,
+ struct pinctrl_map *map, u32 num_maps)
+{
+ kfree(map);
+}
+
+#endif /* CONFIG_OF */
+
+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,
+ .pin_dbg_show = pinctrl_scmi_pin_dbg_show,
+#ifdef CONFIG_OF
+ .dt_node_to_map = pinctrl_scmi_dt_node_to_map,
+ .dt_free_map = pinctrl_scmi_dt_free_map,
+#endif
+};
+
+static int pinctrl_scmi_get_functions_count(struct pinctrl_dev *pctldev)
+{
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ return handle->pinctrl_ops->get_functions_count(handle);
+}
+
+static const char *pinctrl_scmi_get_function_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ int ret;
+ const char *name;
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return NULL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle)
+ return NULL;
+
+ handle = pmx->handle;
+
+ ret = handle->pinctrl_ops->get_function_name(handle, selector, &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;
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle || !groups || !num_groups)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ 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 = handle->pinctrl_ops->get_function_groups(handle, 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_kmalloc_array(pmx->dev, *num_groups,
+ sizeof(*pmx->functions[selector].groups),
+ GFP_KERNEL | __GFP_ZERO);
+ 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 error;
+ }
+ }
+
+ *groups = (const char * const *)pmx->functions[selector].groups;
+
+ return 0;
+
+error:
+ kfree(pmx->functions[selector].groups);
+
+ return ret;
+}
+
+static int pinctrl_scmi_func_set_mux(struct pinctrl_dev *pctldev,
+ unsigned int selector, unsigned int group)
+{
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ return handle->pinctrl_ops->set_mux(handle, selector, group);
+}
+
+static int pinctrl_scmi_request(struct pinctrl_dev *pctldev,
+ unsigned int offset)
+{
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ return handle->pinctrl_ops->request_pin(handle, offset);
+}
+
+static int pinctrl_scmi_free(struct pinctrl_dev *pctldev, unsigned int offset)
+{
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ return handle->pinctrl_ops->free_pin(handle, 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_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned int _pin,
+ unsigned long *config)
+{
+ const struct scmi_handle *handle;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle || !config)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ return handle->pinctrl_ops->get_config(handle, _pin, (u32 *)config);
+}
+
+static int pinctrl_scmi_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned int _pin,
+ unsigned long *configs,
+ unsigned int num_configs)
+{
+ const struct scmi_handle *handle;
+ int i, ret;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle || !configs || num_configs == 0)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ for (i = 0; i < num_configs; i++) {
+ ret = handle->pinctrl_ops->set_config(handle, _pin, configs[i]);
+ if (ret) {
+ dev_err(pmx->dev, "Error parsing config %ld\n",
+ configs[i]);
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static int pinctrl_scmi_pinconf_group_set(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ unsigned long *configs,
+ unsigned int num_configs)
+{
+ const struct scmi_handle *handle;
+ int i, ret;
+ struct scmi_pinctrl *pmx;
+
+ if (!pctldev)
+ return -EINVAL;
+
+ pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!pmx || !pmx->handle || !configs || num_configs == 0)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ for (i = 0; i < num_configs; i++) {
+ ret = handle->pinctrl_ops->set_config_group(handle, group,
+ configs[i]);
+ if (ret) {
+ dev_err(pmx->dev, "Error parsing config = %ld",
+ configs[i]);
+ break;
+ }
+ }
+
+ return ret;
+};
+
+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_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;
+ struct scmi_handle *handle;
+
+ if (!pmx)
+ return -EINVAL;
+
+ handle = pmx->handle;
+
+ if (!handle || !pins || !nr_pins)
+ return -EINVAL;
+
+ if (pmx->nr_pins) {
+ *pins = pmx->pins;
+ *nr_pins = pmx->nr_pins;
+ return 0;
+ }
+
+ *nr_pins = handle->pinctrl_ops->get_pins_count(handle);
+
+ 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 = handle->pinctrl_ops->get_pin_name(handle, i,
+ &pmx->pins[i].name);
+ if (ret) {
+ dev_err(pmx->dev, "Can't get name for pin %d: rc %d",
+ i, ret);
+ goto err;
+ }
+ }
+
+ *pins = pmx->pins;
+ dev_dbg(pmx->dev, "got pins %d", *nr_pins);
+
+ return 0;
+ err:
+ kfree(pmx->pins);
+ pmx->nr_pins = 0;
+
+ return ret;
+}
+
+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 scmi_pinctrl *pmx;
+
+ if (!sdev || !sdev->handle)
+ return -EINVAL;
+
+ pmx = devm_kzalloc(&sdev->dev, sizeof(*pmx), GFP_KERNEL);
+ if (!pmx)
+ return -ENOMEM;
+
+ pmx->handle = sdev->handle;
+ if (!pmx->handle) {
+ ret = -ENOMEM;
+ goto clean;
+ }
+
+ pmx->dev = &sdev->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)
+ goto clean;
+
+ ret = devm_pinctrl_register_and_init(&sdev->dev, &pmx->pctl_desc, pmx,
+ &pmx->pctldev);
+ if (ret) {
+ dev_err(&sdev->dev, "could not register: %i\n", ret);
+ goto clean;
+ }
+
+ 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_kmalloc_array(&sdev->dev, pmx->nr_functions,
+ sizeof(*pmx->functions),
+ GFP_KERNEL | __GFP_ZERO);
+ if (!pmx->functions) {
+ ret = -ENOMEM;
+ goto clean;
+ }
+ }
+
+ if (pmx->nr_groups) {
+ pmx->groups =
+ devm_kmalloc_array(&sdev->dev, pmx->nr_groups,
+ sizeof(*pmx->groups),
+ GFP_KERNEL | __GFP_ZERO);
+ if (!pmx->groups) {
+ ret = -ENOMEM;
+ goto clean;
+ }
+ }
+
+ return pinctrl_enable(pmx->pctldev);
+
+clean:
+ if (pmx) {
+ kfree(pmx->functions);
+ kfree(pmx->groups);
+ }
+
+ kfree(pmx);
+
+ return ret;
+}
+
+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@epam.com>");
+MODULE_DESCRIPTION("ARM SCMI pin controller driver");
+MODULE_LICENSE("GPL v2");