linux/drivers/pinctrl/pinctrl-scmi.c
Peng Fan dbd47012a4 pinctrl: scmi: add blocklist
i.MX95 will have its own pinctrl scmi driver, so need block
pinctrl-scmi driver for i.MX95, otherwise there will be two pinctrl
devices for a single scmi protocol@19.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Link: https://lore.kernel.org/r/20240521-pinctrl-scmi-imx95-v1-2-9a1175d735fd@nxp.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2024-06-17 09:26:04 +02:00

581 lines
14 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* System Control and Power Interface (SCMI) Protocol based pinctrl driver
*
* Copyright (C) 2024 EPAM
* Copyright 2024 NXP
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/of.h>
#include <linux/scmi_protocol.h>
#include <linux/slab.h>
#include <linux/types.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"
/* Define num configs, if not large than 4 use stack, else use kcalloc() */
#define SCMI_NUM_CONFIGS 4
static const struct scmi_pinctrl_proto_ops *pinctrl_ops;
struct scmi_pinctrl {
struct device *dev;
struct scmi_protocol_handle *ph;
struct pinctrl_dev *pctldev;
struct pinctrl_desc pctl_desc;
struct pinfunction *functions;
unsigned int nr_functions;
struct pinctrl_pin_desc *pins;
unsigned int nr_pins;
};
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 **p_groups,
unsigned int * const p_num_groups)
{
struct pinfunction *func;
const unsigned int *group_ids;
unsigned int num_groups;
const char **groups;
int ret, i;
struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
if (!p_groups || !p_num_groups)
return -EINVAL;
if (selector >= pmx->nr_functions)
return -EINVAL;
func = &pmx->functions[selector];
if (func->ngroups)
goto done;
ret = pinctrl_ops->function_groups_get(pmx->ph, selector, &num_groups,
&group_ids);
if (ret) {
dev_err(pmx->dev, "Unable to get function groups, err %d", ret);
return ret;
}
if (!num_groups)
return -EINVAL;
groups = kcalloc(num_groups, sizeof(*groups), GFP_KERNEL);
if (!groups)
return -ENOMEM;
for (i = 0; i < num_groups; i++) {
groups[i] = pinctrl_scmi_get_group_name(pctldev, group_ids[i]);
if (!groups[i]) {
ret = -EINVAL;
goto err_free;
}
}
func->ngroups = num_groups;
func->groups = groups;
done:
*p_groups = func->groups;
*p_num_groups = func->ngroups;
return 0;
err_free:
kfree(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,
enum scmi_pinctrl_conf_type *type)
{
u32 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 = arg;
break;
default:
return -EINVAL;
}
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;
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)
return ret;
ret = pinctrl_ops->settings_get_one(pmx->ph, pin, PIN_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 int
pinctrl_scmi_alloc_configs(struct pinctrl_dev *pctldev, u32 num_configs,
u32 **p_config_value,
enum scmi_pinctrl_conf_type **p_config_type)
{
if (num_configs <= SCMI_NUM_CONFIGS)
return 0;
*p_config_value = kcalloc(num_configs, sizeof(**p_config_value), GFP_KERNEL);
if (!*p_config_value)
return -ENOMEM;
*p_config_type = kcalloc(num_configs, sizeof(**p_config_type), GFP_KERNEL);
if (!*p_config_type) {
kfree(*p_config_value);
return -ENOMEM;
}
return 0;
}
static void
pinctrl_scmi_free_configs(struct pinctrl_dev *pctldev, u32 num_configs,
u32 **p_config_value,
enum scmi_pinctrl_conf_type **p_config_type)
{
if (num_configs <= SCMI_NUM_CONFIGS)
return;
kfree(*p_config_value);
kfree(*p_config_type);
}
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);
enum scmi_pinctrl_conf_type config_type[SCMI_NUM_CONFIGS];
u32 config_value[SCMI_NUM_CONFIGS];
enum scmi_pinctrl_conf_type *p_config_type = config_type;
u32 *p_config_value = config_value;
enum pin_config_param param;
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, pin, PIN_TYPE, num_configs,
p_config_type, p_config_value);
if (ret)
dev_err(pmx->dev, "Error parsing config %d\n", ret);
free_config:
pinctrl_scmi_free_configs(pctldev, num_configs, &p_config_type,
&p_config_value);
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);
enum scmi_pinctrl_conf_type config_type[SCMI_NUM_CONFIGS];
u32 config_value[SCMI_NUM_CONFIGS];
enum scmi_pinctrl_conf_type *p_config_type = config_type;
u32 *p_config_value = config_value;
enum pin_config_param param;
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 const char * const scmi_pinctrl_blocklist[] = {
"fsl,imx95",
NULL
};
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;
if (of_machine_compatible_match(scmi_pinctrl_blocklist))
return -ENODEV;
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");