pinctrl: Implementation of the generic scmi-pinctrl driver
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@epam.com> Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@epam.com> Reviewed-by: Dhruva Gole <d-gole@ti.com> Reviewed-by: Andy Shevchenko <andy@kernel.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Peng Fan <peng.fan@nxp.com> Link: https://lore.kernel.org/r/20240418-pinctrl-scmi-v11-4-499dca9864a7@nxp.com Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Peng Fan
Sudeep Holla
parent
2145af01b9
commit
eb524cb651
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@ -21453,6 +21453,7 @@ F: drivers/cpufreq/sc[mp]i-cpufreq.c
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F: drivers/firmware/arm_scmi/
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F: drivers/firmware/arm_scpi.c
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F: drivers/hwmon/scmi-hwmon.c
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F: drivers/pinctrl/pinctrl-scmi.c
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F: drivers/pmdomain/arm/
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F: drivers/powercap/arm_scmi_powercap.c
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F: drivers/regulator/scmi-regulator.c
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@ -450,6 +450,17 @@ config PINCTRL_ROCKCHIP
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help
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This support pinctrl and GPIO driver for Rockchip SoCs.
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config PINCTRL_SCMI
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tristate "Pinctrl driver using SCMI protocol interface"
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depends on ARM_SCMI_PROTOCOL || COMPILE_TEST
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select PINMUX
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select GENERIC_PINCONF
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help
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This driver provides support for pinctrl which is controlled
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by firmware that implements the SCMI interface.
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It uses SCMI Message Protocol to interact with the
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firmware providing all the pinctrl controls.
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config PINCTRL_SINGLE
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tristate "One-register-per-pin type device tree based pinctrl driver"
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depends on OF
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@ -45,6 +45,7 @@ obj-$(CONFIG_PINCTRL_PIC32) += pinctrl-pic32.o
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obj-$(CONFIG_PINCTRL_PISTACHIO) += pinctrl-pistachio.o
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obj-$(CONFIG_PINCTRL_RK805) += pinctrl-rk805.o
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obj-$(CONFIG_PINCTRL_ROCKCHIP) += pinctrl-rockchip.o
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obj-$(CONFIG_PINCTRL_SCMI) += pinctrl-scmi.o
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obj-$(CONFIG_PINCTRL_SINGLE) += pinctrl-single.o
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obj-$(CONFIG_PINCTRL_ST) += pinctrl-st.o
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obj-$(CONFIG_PINCTRL_STMFX) += pinctrl-stmfx.o
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@ -0,0 +1,571 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Power Interface (SCMI) Protocol based pinctrl driver
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*
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* Copyright (C) 2024 EPAM
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* Copyright 2024 NXP
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/scmi_protocol.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/pinctrl/machine.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinmux.h>
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#include "pinctrl-utils.h"
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#include "core.h"
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#include "pinconf.h"
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#define DRV_NAME "scmi-pinctrl"
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/* Define num configs, if not large than 4 use stack, else use kcalloc() */
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#define SCMI_NUM_CONFIGS 4
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static const struct scmi_pinctrl_proto_ops *pinctrl_ops;
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struct scmi_pinctrl {
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struct device *dev;
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struct scmi_protocol_handle *ph;
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struct pinctrl_dev *pctldev;
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struct pinctrl_desc pctl_desc;
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struct pinfunction *functions;
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unsigned int nr_functions;
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struct pinctrl_pin_desc *pins;
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unsigned int nr_pins;
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};
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static int pinctrl_scmi_get_groups_count(struct pinctrl_dev *pctldev)
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{
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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return pinctrl_ops->count_get(pmx->ph, GROUP_TYPE);
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}
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static const char *pinctrl_scmi_get_group_name(struct pinctrl_dev *pctldev,
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unsigned int selector)
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{
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int ret;
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const char *name;
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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ret = pinctrl_ops->name_get(pmx->ph, selector, GROUP_TYPE, &name);
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if (ret) {
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dev_err(pmx->dev, "get name failed with err %d", ret);
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return NULL;
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}
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return name;
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}
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static int pinctrl_scmi_get_group_pins(struct pinctrl_dev *pctldev,
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unsigned int selector,
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const unsigned int **pins,
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unsigned int *num_pins)
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{
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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return pinctrl_ops->group_pins_get(pmx->ph, selector, pins, num_pins);
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}
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static const struct pinctrl_ops pinctrl_scmi_pinctrl_ops = {
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.get_groups_count = pinctrl_scmi_get_groups_count,
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.get_group_name = pinctrl_scmi_get_group_name,
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.get_group_pins = pinctrl_scmi_get_group_pins,
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#ifdef CONFIG_OF
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.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
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.dt_free_map = pinconf_generic_dt_free_map,
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#endif
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};
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static int pinctrl_scmi_get_functions_count(struct pinctrl_dev *pctldev)
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{
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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return pinctrl_ops->count_get(pmx->ph, FUNCTION_TYPE);
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}
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static const char *pinctrl_scmi_get_function_name(struct pinctrl_dev *pctldev,
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unsigned int selector)
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{
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int ret;
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const char *name;
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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ret = pinctrl_ops->name_get(pmx->ph, selector, FUNCTION_TYPE, &name);
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if (ret) {
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dev_err(pmx->dev, "get name failed with err %d", ret);
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return NULL;
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}
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return name;
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}
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static int pinctrl_scmi_get_function_groups(struct pinctrl_dev *pctldev,
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unsigned int selector,
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const char * const **p_groups,
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unsigned int * const p_num_groups)
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{
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struct pinfunction *func;
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const unsigned int *group_ids;
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unsigned int num_groups;
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const char **groups;
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int ret, i;
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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if (!p_groups || !p_num_groups)
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return -EINVAL;
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if (selector >= pmx->nr_functions)
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return -EINVAL;
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func = &pmx->functions[selector];
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if (func->ngroups)
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goto done;
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ret = pinctrl_ops->function_groups_get(pmx->ph, selector, &num_groups,
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&group_ids);
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if (ret) {
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dev_err(pmx->dev, "Unable to get function groups, err %d", ret);
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return ret;
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}
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if (!num_groups)
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return -EINVAL;
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groups = kcalloc(num_groups, sizeof(*groups), GFP_KERNEL);
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if (!groups)
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return -ENOMEM;
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for (i = 0; i < num_groups; i++) {
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groups[i] = pinctrl_scmi_get_group_name(pctldev, group_ids[i]);
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if (!groups[i]) {
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ret = -EINVAL;
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goto err_free;
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}
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}
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func->ngroups = num_groups;
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func->groups = groups;
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done:
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*p_groups = func->groups;
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*p_num_groups = func->ngroups;
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return 0;
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err_free:
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kfree(groups);
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return ret;
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}
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static int pinctrl_scmi_func_set_mux(struct pinctrl_dev *pctldev,
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unsigned int selector, unsigned int group)
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{
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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return pinctrl_ops->mux_set(pmx->ph, selector, group);
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}
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static int pinctrl_scmi_request(struct pinctrl_dev *pctldev,
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unsigned int offset)
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{
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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return pinctrl_ops->pin_request(pmx->ph, offset);
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}
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static int pinctrl_scmi_free(struct pinctrl_dev *pctldev, unsigned int offset)
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{
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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return pinctrl_ops->pin_free(pmx->ph, offset);
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}
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static const struct pinmux_ops pinctrl_scmi_pinmux_ops = {
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.request = pinctrl_scmi_request,
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.free = pinctrl_scmi_free,
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.get_functions_count = pinctrl_scmi_get_functions_count,
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.get_function_name = pinctrl_scmi_get_function_name,
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.get_function_groups = pinctrl_scmi_get_function_groups,
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.set_mux = pinctrl_scmi_func_set_mux,
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};
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static int pinctrl_scmi_map_pinconf_type(enum pin_config_param param,
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enum scmi_pinctrl_conf_type *type)
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{
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u32 arg = param;
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switch (arg) {
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case PIN_CONFIG_BIAS_BUS_HOLD:
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*type = SCMI_PIN_BIAS_BUS_HOLD;
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break;
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case PIN_CONFIG_BIAS_DISABLE:
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*type = SCMI_PIN_BIAS_DISABLE;
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break;
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case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
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*type = SCMI_PIN_BIAS_HIGH_IMPEDANCE;
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break;
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case PIN_CONFIG_BIAS_PULL_DOWN:
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*type = SCMI_PIN_BIAS_PULL_DOWN;
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break;
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case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
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*type = SCMI_PIN_BIAS_PULL_DEFAULT;
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break;
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case PIN_CONFIG_BIAS_PULL_UP:
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*type = SCMI_PIN_BIAS_PULL_UP;
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break;
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case PIN_CONFIG_DRIVE_OPEN_DRAIN:
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*type = SCMI_PIN_DRIVE_OPEN_DRAIN;
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break;
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case PIN_CONFIG_DRIVE_OPEN_SOURCE:
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*type = SCMI_PIN_DRIVE_OPEN_SOURCE;
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break;
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case PIN_CONFIG_DRIVE_PUSH_PULL:
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*type = SCMI_PIN_DRIVE_PUSH_PULL;
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break;
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case PIN_CONFIG_DRIVE_STRENGTH:
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*type = SCMI_PIN_DRIVE_STRENGTH;
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break;
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case PIN_CONFIG_DRIVE_STRENGTH_UA:
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*type = SCMI_PIN_DRIVE_STRENGTH;
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break;
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case PIN_CONFIG_INPUT_DEBOUNCE:
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*type = SCMI_PIN_INPUT_DEBOUNCE;
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break;
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case PIN_CONFIG_INPUT_ENABLE:
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*type = SCMI_PIN_INPUT_MODE;
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break;
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case PIN_CONFIG_INPUT_SCHMITT:
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*type = SCMI_PIN_INPUT_SCHMITT;
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break;
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case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
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*type = SCMI_PIN_INPUT_MODE;
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break;
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case PIN_CONFIG_MODE_LOW_POWER:
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*type = SCMI_PIN_LOW_POWER_MODE;
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break;
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case PIN_CONFIG_OUTPUT:
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*type = SCMI_PIN_OUTPUT_VALUE;
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break;
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case PIN_CONFIG_OUTPUT_ENABLE:
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*type = SCMI_PIN_OUTPUT_MODE;
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break;
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case PIN_CONFIG_OUTPUT_IMPEDANCE_OHMS:
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*type = SCMI_PIN_OUTPUT_VALUE;
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break;
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case PIN_CONFIG_POWER_SOURCE:
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*type = SCMI_PIN_POWER_SOURCE;
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break;
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case PIN_CONFIG_SLEW_RATE:
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*type = SCMI_PIN_SLEW_RATE;
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break;
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case SCMI_PIN_OEM_START ... SCMI_PIN_OEM_END:
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*type = arg;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int pinctrl_scmi_pinconf_get(struct pinctrl_dev *pctldev,
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unsigned int pin, unsigned long *config)
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{
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int ret;
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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enum pin_config_param config_type;
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enum scmi_pinctrl_conf_type type;
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u32 config_value;
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if (!config)
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return -EINVAL;
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config_type = pinconf_to_config_param(*config);
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ret = pinctrl_scmi_map_pinconf_type(config_type, &type);
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if (ret)
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return ret;
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ret = pinctrl_ops->settings_get_one(pmx->ph, pin, PIN_TYPE, type,
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&config_value);
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/* Convert SCMI error code to PINCTRL expected error code */
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if (ret == -EOPNOTSUPP)
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return -ENOTSUPP;
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if (ret)
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return ret;
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*config = pinconf_to_config_packed(config_type, config_value);
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return 0;
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}
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static int
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pinctrl_scmi_alloc_configs(struct pinctrl_dev *pctldev, u32 num_configs,
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u32 **p_config_value,
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enum scmi_pinctrl_conf_type **p_config_type)
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{
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if (num_configs <= SCMI_NUM_CONFIGS)
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return 0;
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*p_config_value = kcalloc(num_configs, sizeof(**p_config_value), GFP_KERNEL);
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if (!*p_config_value)
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return -ENOMEM;
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*p_config_type = kcalloc(num_configs, sizeof(**p_config_type), GFP_KERNEL);
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if (!*p_config_type) {
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kfree(*p_config_value);
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return -ENOMEM;
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}
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return 0;
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}
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static void
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pinctrl_scmi_free_configs(struct pinctrl_dev *pctldev, u32 num_configs,
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u32 **p_config_value,
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enum scmi_pinctrl_conf_type **p_config_type)
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{
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if (num_configs <= SCMI_NUM_CONFIGS)
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return;
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kfree(*p_config_value);
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kfree(*p_config_type);
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}
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static int pinctrl_scmi_pinconf_set(struct pinctrl_dev *pctldev,
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unsigned int pin,
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unsigned long *configs,
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unsigned int num_configs)
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{
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int i, ret;
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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enum scmi_pinctrl_conf_type config_type[SCMI_NUM_CONFIGS];
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u32 config_value[SCMI_NUM_CONFIGS];
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enum scmi_pinctrl_conf_type *p_config_type = config_type;
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u32 *p_config_value = config_value;
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enum pin_config_param param;
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if (!configs || !num_configs)
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return -EINVAL;
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ret = pinctrl_scmi_alloc_configs(pctldev, num_configs, &p_config_type,
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&p_config_value);
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if (ret)
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return ret;
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for (i = 0; i < num_configs; i++) {
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param = pinconf_to_config_param(configs[i]);
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ret = pinctrl_scmi_map_pinconf_type(param, &p_config_type[i]);
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if (ret) {
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dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
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goto free_config;
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}
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p_config_value[i] = pinconf_to_config_argument(configs[i]);
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}
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ret = pinctrl_ops->settings_conf(pmx->ph, pin, PIN_TYPE, num_configs,
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p_config_type, p_config_value);
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if (ret)
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dev_err(pmx->dev, "Error parsing config %d\n", ret);
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free_config:
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pinctrl_scmi_free_configs(pctldev, num_configs, &p_config_type,
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&p_config_value);
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return ret;
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}
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static int pinctrl_scmi_pinconf_group_set(struct pinctrl_dev *pctldev,
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unsigned int group,
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unsigned long *configs,
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unsigned int num_configs)
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{
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int i, ret;
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struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
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enum scmi_pinctrl_conf_type config_type[SCMI_NUM_CONFIGS];
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u32 config_value[SCMI_NUM_CONFIGS];
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enum scmi_pinctrl_conf_type *p_config_type = config_type;
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u32 *p_config_value = config_value;
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enum pin_config_param param;
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if (!configs || !num_configs)
|
||||
return -EINVAL;
|
||||
|
||||
ret = pinctrl_scmi_alloc_configs(pctldev, num_configs, &p_config_type,
|
||||
&p_config_value);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
for (i = 0; i < num_configs; i++) {
|
||||
param = pinconf_to_config_param(configs[i]);
|
||||
ret = pinctrl_scmi_map_pinconf_type(param, &p_config_type[i]);
|
||||
if (ret) {
|
||||
dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
|
||||
goto free_config;
|
||||
}
|
||||
|
||||
p_config_value[i] = pinconf_to_config_argument(configs[i]);
|
||||
}
|
||||
|
||||
ret = pinctrl_ops->settings_conf(pmx->ph, group, GROUP_TYPE,
|
||||
num_configs, p_config_type,
|
||||
p_config_value);
|
||||
if (ret)
|
||||
dev_err(pmx->dev, "Error parsing config %d", ret);
|
||||
|
||||
free_config:
|
||||
pinctrl_scmi_free_configs(pctldev, num_configs, &p_config_type,
|
||||
&p_config_value);
|
||||
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;
|
||||
enum scmi_pinctrl_conf_type type;
|
||||
u32 config_value;
|
||||
|
||||
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->settings_get_one(pmx->ph, group, GROUP_TYPE, type,
|
||||
&config_value);
|
||||
/* Convert SCMI error code to PINCTRL expected error code */
|
||||
if (ret == -EOPNOTSUPP)
|
||||
return -ENOTSUPP;
|
||||
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,
|
||||
struct pinctrl_desc *desc)
|
||||
{
|
||||
struct pinctrl_pin_desc *pins;
|
||||
unsigned int npins;
|
||||
int ret, i;
|
||||
|
||||
npins = pinctrl_ops->count_get(pmx->ph, PIN_TYPE);
|
||||
/*
|
||||
* npins will never be zero, the scmi pinctrl driver has bailed out
|
||||
* if npins is zero.
|
||||
*/
|
||||
pins = devm_kmalloc_array(pmx->dev, npins, sizeof(*pins), GFP_KERNEL);
|
||||
if (!pins)
|
||||
return -ENOMEM;
|
||||
|
||||
for (i = 0; i < npins; i++) {
|
||||
pins[i].number = i;
|
||||
/*
|
||||
* The memory for name is handled by the scmi firmware driver,
|
||||
* no need free here
|
||||
*/
|
||||
ret = pinctrl_ops->name_get(pmx->ph, i, PIN_TYPE, &pins[i].name);
|
||||
if (ret)
|
||||
return dev_err_probe(pmx->dev, ret,
|
||||
"Can't get name for pin %d", i);
|
||||
}
|
||||
|
||||
desc->npins = npins;
|
||||
desc->pins = pins;
|
||||
dev_dbg(pmx->dev, "got pins %u", npins);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
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->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->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);
|
||||
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->functions = devm_kcalloc(dev, pmx->nr_functions,
|
||||
sizeof(*pmx->functions), GFP_KERNEL);
|
||||
if (!pmx->functions)
|
||||
return -ENOMEM;
|
||||
|
||||
return pinctrl_enable(pmx->pctldev);
|
||||
}
|
||||
|
||||
static const struct scmi_device_id scmi_id_table[] = {
|
||||
{ SCMI_PROTOCOL_PINCTRL, "pinctrl" },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(scmi, scmi_id_table);
|
||||
|
||||
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_AUTHOR("Peng Fan <peng.fan@nxp.com>");
|
||||
MODULE_DESCRIPTION("ARM SCMI pin controller driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue