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Message-ID: <Za6fV67ThX7bcniQ@pluto>
Date: Mon, 22 Jan 2024 17:01:11 +0000
From: Cristian Marussi <cristian.marussi@....com>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: Sudeep Holla <sudeep.holla@....com>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Oleksii Moisieiev <oleksii_moisieiev@...m.com>,
Linus Walleij <linus.walleij@...aro.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
AKASHI Takahiro <takahiro.akashi@...aro.org>,
Peng Fan <peng.fan@....com>
Subject: Re: [PATCH v3 3/6] firmware: arm_scmi: Add SCMI v3.2 pincontrol
protocol basic support
On Sun, Jan 21, 2024 at 06:21:52PM +0800, Peng Fan (OSS) wrote:
> From: Oleksii Moisieiev <oleksii_moisieiev@...m.com>
>
> Add basic implementation of the SCMI v3.2 pincontrol protocol.
>
> Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@...m.com>
> Co-developed-by: Peng Fan <peng.fan@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>
LGTM.
Reviewed-by: Cristian Marussi <cristian.marussi@....com>
Tested-by: Cristian Marussi <cristian.marussi@....com>
Thanks,
Cristian
> ---
> drivers/firmware/arm_scmi/Makefile | 1 +
> drivers/firmware/arm_scmi/driver.c | 2 +
> drivers/firmware/arm_scmi/pinctrl.c | 908 ++++++++++++++++++++++++++++++++++
> drivers/firmware/arm_scmi/protocols.h | 1 +
> include/linux/scmi_protocol.h | 75 +++
> 5 files changed, 987 insertions(+)
>
> diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
> index a7bc4796519c..8e3874ff1544 100644
> --- a/drivers/firmware/arm_scmi/Makefile
> +++ b/drivers/firmware/arm_scmi/Makefile
> @@ -11,6 +11,7 @@ scmi-transport-$(CONFIG_ARM_SCMI_HAVE_MSG) += msg.o
> scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_VIRTIO) += virtio.o
> scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_OPTEE) += optee.o
> scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o system.o voltage.o powercap.o
> +scmi-protocols-y += pinctrl.o
> scmi-module-objs := $(scmi-driver-y) $(scmi-protocols-y) $(scmi-transport-y)
>
> obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-core.o
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index a12afc254afa..4c3752749105 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -3050,6 +3050,7 @@ static int __init scmi_driver_init(void)
> scmi_voltage_register();
> scmi_system_register();
> scmi_powercap_register();
> + scmi_pinctrl_register();
>
> return platform_driver_register(&scmi_driver);
> }
> @@ -3067,6 +3068,7 @@ static void __exit scmi_driver_exit(void)
> scmi_voltage_unregister();
> scmi_system_unregister();
> scmi_powercap_unregister();
> + scmi_pinctrl_unregister();
>
> scmi_transports_exit();
>
> diff --git a/drivers/firmware/arm_scmi/pinctrl.c b/drivers/firmware/arm_scmi/pinctrl.c
> new file mode 100644
> index 000000000000..0fcfa4269473
> --- /dev/null
> +++ b/drivers/firmware/arm_scmi/pinctrl.c
> @@ -0,0 +1,908 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * System Control and Management Interface (SCMI) Pinctrl Protocol
> + *
> + * Copyright (C) 2024 EPAM
> + * Copyright 2024 NXP
> + */
> +
> +#include <linux/module.h>
> +#include <linux/scmi_protocol.h>
> +#include <linux/slab.h>
> +
> +#include "common.h"
> +#include "protocols.h"
> +
> +/* Updated only after ALL the mandatory features for that version are merged */
> +#define SCMI_PROTOCOL_SUPPORTED_VERSION 0x0
> +
> +#define REG_TYPE_BITS GENMASK(9, 8)
> +#define REG_CONFIG GENMASK(7, 0)
> +
> +#define GET_GROUPS_NR(x) le32_get_bits((x), GENMASK(31, 16))
> +#define GET_PINS_NR(x) le32_get_bits((x), GENMASK(15, 0))
> +#define GET_FUNCTIONS_NR(x) le32_get_bits((x), GENMASK(15, 0))
> +
> +#define EXT_NAME_FLAG(x) le32_get_bits((x), BIT(31))
> +#define NUM_ELEMS(x) le32_get_bits((x), GENMASK(15, 0))
> +
> +#define REMAINING(x) le32_get_bits((x), GENMASK(31, 16))
> +#define RETURNED(x) le32_get_bits((x), GENMASK(11, 0))
> +
> +enum scmi_pinctrl_protocol_cmd {
> + PINCTRL_ATTRIBUTES = 0x3,
> + PINCTRL_LIST_ASSOCIATIONS = 0x4,
> + PINCTRL_CONFIG_GET = 0x5,
> + PINCTRL_CONFIG_SET = 0x6,
> + PINCTRL_FUNCTION_SELECT = 0x7,
> + PINCTRL_REQUEST = 0x8,
> + PINCTRL_RELEASE = 0x9,
> + PINCTRL_NAME_GET = 0xa,
> + PINCTRL_SET_PERMISSIONS = 0xb
> +};
> +
> +struct scmi_msg_conf_set {
> + __le32 identifier;
> + __le32 attributes;
> + __le32 configs[];
> +};
> +
> +struct scmi_msg_conf_get {
> + __le32 identifier;
> + __le32 attributes;
> +};
> +
> +struct scmi_resp_conf_get {
> + __le32 num_configs;
> + __le32 configs[];
> +};
> +
> +struct scmi_msg_pinctrl_protocol_attributes {
> + __le32 attributes_low;
> + __le32 attributes_high;
> +};
> +
> +struct scmi_msg_pinctrl_attributes {
> + __le32 identifier;
> + __le32 flags;
> +};
> +
> +struct scmi_resp_pinctrl_attributes {
> + __le32 attributes;
> + u8 name[SCMI_SHORT_NAME_MAX_SIZE];
> +};
> +
> +struct scmi_msg_pinctrl_list_assoc {
> + __le32 identifier;
> + __le32 flags;
> + __le32 index;
> +};
> +
> +struct scmi_resp_pinctrl_list_assoc {
> + __le32 flags;
> + __le16 array[];
> +};
> +
> +struct scmi_msg_func_set {
> + __le32 identifier;
> + __le32 function_id;
> + __le32 flags;
> +};
> +
> +struct scmi_msg_request {
> + __le32 identifier;
> + __le32 flags;
> +};
> +
> +struct scmi_group_info {
> + char name[SCMI_MAX_STR_SIZE];
> + bool present;
> + unsigned int *group_pins;
> + unsigned int nr_pins;
> +};
> +
> +struct scmi_function_info {
> + char name[SCMI_MAX_STR_SIZE];
> + bool present;
> + unsigned int *groups;
> + unsigned int nr_groups;
> +};
> +
> +struct scmi_pin_info {
> + char name[SCMI_MAX_STR_SIZE];
> + bool present;
> +};
> +
> +struct scmi_pinctrl_info {
> + u32 version;
> + int nr_groups;
> + int nr_functions;
> + int nr_pins;
> + struct scmi_group_info *groups;
> + struct scmi_function_info *functions;
> + struct scmi_pin_info *pins;
> +};
> +
> +static int scmi_pinctrl_attributes_get(const struct scmi_protocol_handle *ph,
> + struct scmi_pinctrl_info *pi)
> +{
> + int ret;
> + struct scmi_xfer *t;
> + struct scmi_msg_pinctrl_protocol_attributes *attr;
> +
> + ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES, 0, sizeof(*attr),
> + &t);
> + if (ret)
> + return ret;
> +
> + attr = t->rx.buf;
> +
> + ret = ph->xops->do_xfer(ph, t);
> + if (!ret) {
> + pi->nr_functions = GET_FUNCTIONS_NR(attr->attributes_high);
> + pi->nr_groups = GET_GROUPS_NR(attr->attributes_low);
> + pi->nr_pins = GET_PINS_NR(attr->attributes_low);
> + }
> +
> + ph->xops->xfer_put(ph, t);
> + return ret;
> +}
> +
> +static int scmi_pinctrl_count_get(const struct scmi_protocol_handle *ph,
> + enum scmi_pinctrl_selector_type type)
> +{
> + struct scmi_pinctrl_info *pi = ph->get_priv(ph);
> +
> + switch (type) {
> + case PIN_TYPE:
> + return pi->nr_pins;
> + case GROUP_TYPE:
> + return pi->nr_groups;
> + case FUNCTION_TYPE:
> + return pi->nr_functions;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int scmi_pinctrl_validate_id(const struct scmi_protocol_handle *ph,
> + u32 identifier,
> + enum scmi_pinctrl_selector_type type)
> +{
> + int value;
> +
> + value = scmi_pinctrl_count_get(ph, type);
> + if (value < 0)
> + return value;
> +
> + if (identifier >= value)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int scmi_pinctrl_attributes(const struct scmi_protocol_handle *ph,
> + enum scmi_pinctrl_selector_type type,
> + u32 selector, char *name,
> + unsigned int *n_elems)
> +{
> + int ret;
> + struct scmi_xfer *t;
> + struct scmi_msg_pinctrl_attributes *tx;
> + struct scmi_resp_pinctrl_attributes *rx;
> +
> + if (!name)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_validate_id(ph, selector, type);
> + if (ret)
> + return ret;
> +
> + ret = ph->xops->xfer_get_init(ph, PINCTRL_ATTRIBUTES, sizeof(*tx),
> + sizeof(*rx), &t);
> + if (ret)
> + return ret;
> +
> + tx = t->tx.buf;
> + rx = t->rx.buf;
> + tx->identifier = cpu_to_le32(selector);
> + tx->flags = cpu_to_le32(type);
> +
> + ret = ph->xops->do_xfer(ph, t);
> + if (!ret) {
> + if (n_elems)
> + *n_elems = NUM_ELEMS(rx->attributes);
> +
> + strscpy(name, rx->name, SCMI_SHORT_NAME_MAX_SIZE);
> + }
> +
> + ph->xops->xfer_put(ph, t);
> +
> + /*
> + * If supported overwrite short name with the extended one;
> + * on error just carry on and use already provided short name.
> + */
> + if (!ret && EXT_NAME_FLAG(rx->attributes))
> + ph->hops->extended_name_get(ph, PINCTRL_NAME_GET, selector,
> + (u32 *)&type, name,
> + SCMI_MAX_STR_SIZE);
> + return ret;
> +}
> +
> +struct scmi_pinctrl_ipriv {
> + u32 selector;
> + enum scmi_pinctrl_selector_type type;
> + unsigned int *array;
> +};
> +
> +static void iter_pinctrl_assoc_prepare_message(void *message,
> + unsigned int desc_index,
> + const void *priv)
> +{
> + struct scmi_msg_pinctrl_list_assoc *msg = message;
> + const struct scmi_pinctrl_ipriv *p = priv;
> +
> + msg->identifier = cpu_to_le32(p->selector);
> + msg->flags = cpu_to_le32(p->type);
> + /* Set the number of OPPs to be skipped/already read */
> + msg->index = cpu_to_le32(desc_index);
> +}
> +
> +static int iter_pinctrl_assoc_update_state(struct scmi_iterator_state *st,
> + const void *response, void *priv)
> +{
> + const struct scmi_resp_pinctrl_list_assoc *r = response;
> +
> + st->num_returned = RETURNED(r->flags);
> + st->num_remaining = REMAINING(r->flags);
> +
> + return 0;
> +}
> +
> +static int
> +iter_pinctrl_assoc_process_response(const struct scmi_protocol_handle *ph,
> + const void *response,
> + struct scmi_iterator_state *st, void *priv)
> +{
> + const struct scmi_resp_pinctrl_list_assoc *r = response;
> + struct scmi_pinctrl_ipriv *p = priv;
> +
> + p->array[st->desc_index + st->loop_idx] =
> + le16_to_cpu(r->array[st->loop_idx]);
> +
> + return 0;
> +}
> +
> +static int scmi_pinctrl_list_associations(const struct scmi_protocol_handle *ph,
> + u32 selector,
> + enum scmi_pinctrl_selector_type type,
> + u16 size, unsigned int *array)
> +{
> + int ret;
> + void *iter;
> + struct scmi_iterator_ops ops = {
> + .prepare_message = iter_pinctrl_assoc_prepare_message,
> + .update_state = iter_pinctrl_assoc_update_state,
> + .process_response = iter_pinctrl_assoc_process_response,
> + };
> + struct scmi_pinctrl_ipriv ipriv = {
> + .selector = selector,
> + .type = type,
> + .array = array,
> + };
> +
> + if (!array || !size || type == PIN_TYPE)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_validate_id(ph, selector, type);
> + if (ret)
> + return ret;
> +
> + iter = ph->hops->iter_response_init(ph, &ops, size,
> + PINCTRL_LIST_ASSOCIATIONS,
> + sizeof(struct scmi_msg_pinctrl_list_assoc),
> + &ipriv);
> +
> + if (IS_ERR(iter))
> + return PTR_ERR(iter);
> +
> + return ph->hops->iter_response_run(iter);
> +}
> +
> +struct scmi_conf_get_ipriv {
> + u32 selector;
> + enum scmi_pinctrl_selector_type type;
> + u8 all;
> + enum scmi_pinctrl_conf_type *config_types;
> + u32 *config_values;
> +};
> +
> +static void iter_pinctrl_conf_get_prepare_message(void *message,
> + unsigned int desc_index,
> + const void *priv)
> +{
> + struct scmi_msg_conf_get *msg = message;
> + const struct scmi_conf_get_ipriv *p = priv;
> + u32 attributes;
> +
> + attributes = FIELD_PREP(BIT(18), p->all) |
> + FIELD_PREP(GENMASK(17, 16), p->type);
> +
> + if (p->all)
> + attributes |= FIELD_PREP(GENMASK(15, 8), desc_index);
> + else
> + attributes |= FIELD_PREP(GENMASK(7, 0), p->config_types[0]);
> +
> + msg->attributes = cpu_to_le32(attributes);
> + msg->identifier = cpu_to_le32(p->selector);
> +}
> +
> +static int iter_pinctrl_conf_get_update_state(struct scmi_iterator_state *st,
> + const void *response, void *priv)
> +{
> + const struct scmi_resp_conf_get *r = response;
> + struct scmi_conf_get_ipriv *p = priv;
> +
> + if (!p->all) {
> + st->num_returned = 1;
> + st->num_remaining = 0;
> + } else {
> + st->num_returned = le32_get_bits(r->num_configs, GENMASK(7, 0));
> + st->num_remaining = le32_get_bits(r->num_configs,
> + GENMASK(31, 24));
> + }
> +
> + return 0;
> +}
> +
> +static int
> +iter_pinctrl_conf_get_process_response(const struct scmi_protocol_handle *ph,
> + const void *response,
> + struct scmi_iterator_state *st,
> + void *priv)
> +{
> + const struct scmi_resp_conf_get *r = response;
> + struct scmi_conf_get_ipriv *p = priv;
> +
> + if (!p->all) {
> + if (p->config_types[0] !=
> + le32_get_bits(r->configs[st->loop_idx * 2], GENMASK(7, 0)))
> + return -EINVAL;
> + } else {
> + p->config_types[st->desc_index + st->loop_idx] =
> + le32_get_bits(r->configs[st->loop_idx * 2],
> + GENMASK(7, 0));
> + }
> +
> + p->config_values[st->desc_index + st->loop_idx] =
> + le32_to_cpu(r->configs[st->loop_idx * 2 + 1]);
> +
> + return 0;
> +}
> +
> +static int
> +scmi_pinctrl_config_get(const struct scmi_protocol_handle *ph, u32 selector,
> + enum scmi_pinctrl_selector_type type,
> + enum scmi_pinctrl_conf_type config_type,
> + u32 *config_value)
> +{
> + int ret;
> + void *iter;
> + struct scmi_iterator_ops ops = {
> + .prepare_message = iter_pinctrl_conf_get_prepare_message,
> + .update_state = iter_pinctrl_conf_get_update_state,
> + .process_response = iter_pinctrl_conf_get_process_response,
> + };
> + struct scmi_conf_get_ipriv ipriv = {
> + .selector = selector,
> + .type = type,
> + .all = 0,
> + .config_types = &config_type,
> + .config_values = config_value,
> + };
> +
> + if (!config_value || type == FUNCTION_TYPE)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_validate_id(ph, selector, type);
> + if (ret)
> + return ret;
> +
> + iter = ph->hops->iter_response_init(ph, &ops, 1, PINCTRL_CONFIG_GET,
> + sizeof(struct scmi_msg_conf_get),
> + &ipriv);
> +
> + if (IS_ERR(iter))
> + return PTR_ERR(iter);
> +
> + return ph->hops->iter_response_run(iter);
> +}
> +
> +static int
> +scmi_pinctrl_config_set(const struct scmi_protocol_handle *ph, u32 selector,
> + enum scmi_pinctrl_selector_type type,
> + unsigned int nr_configs,
> + enum scmi_pinctrl_conf_type *config_type,
> + u32 *config_value)
> +{
> + struct scmi_xfer *t;
> + struct scmi_msg_conf_set *tx;
> + u32 attributes;
> + int ret, i;
> + unsigned int configs_in_chunk, conf_num = 0;
> + unsigned int chunk;
> + int max_msg_size = ph->hops->get_max_msg_size(ph);
> +
> + if (!config_type || !config_value || type == FUNCTION_TYPE)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_validate_id(ph, selector, type);
> + if (ret)
> + return ret;
> +
> + configs_in_chunk = (max_msg_size - sizeof(*tx)) / (sizeof(__le32) * 2);
> + while (conf_num < nr_configs) {
> + chunk = (nr_configs - conf_num > configs_in_chunk) ?
> + configs_in_chunk : nr_configs - conf_num;
> +
> + ret = ph->xops->xfer_get_init(ph, PINCTRL_CONFIG_SET,
> + sizeof(*tx) +
> + chunk * 2 * sizeof(__le32),
> + 0, &t);
> + if (ret)
> + return ret;
> +
> + tx = t->tx.buf;
> + tx->identifier = cpu_to_le32(selector);
> + attributes = FIELD_PREP(GENMASK(1, 0), type) |
> + FIELD_PREP(GENMASK(9, 2), chunk);
> + tx->attributes = cpu_to_le32(attributes);
> +
> + for (i = 0; i < chunk; i++) {
> + tx->configs[i * 2] =
> + cpu_to_le32(config_type[conf_num + i]);
> + tx->configs[i * 2 + 1] =
> + cpu_to_le32(config_value[conf_num + i]);
> + }
> +
> + ret = ph->xops->do_xfer(ph, t);
> +
> + ph->xops->xfer_put(ph, t);
> +
> + if (ret)
> + break;
> +
> + conf_num += chunk;
> + }
> +
> + return ret;
> +}
> +
> +static int scmi_pinctrl_function_select(const struct scmi_protocol_handle *ph,
> + u32 identifier,
> + enum scmi_pinctrl_selector_type type,
> + u32 function_id)
> +{
> + int ret;
> + struct scmi_xfer *t;
> + struct scmi_msg_func_set *tx;
> +
> + if (type == FUNCTION_TYPE)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_validate_id(ph, identifier, type);
> + if (ret)
> + return ret;
> +
> + ret = ph->xops->xfer_get_init(ph, PINCTRL_FUNCTION_SELECT, sizeof(*tx),
> + 0, &t);
> + if (ret)
> + return ret;
> +
> + tx = t->tx.buf;
> + tx->identifier = cpu_to_le32(identifier);
> + tx->function_id = cpu_to_le32(function_id);
> + tx->flags = cpu_to_le32(type);
> +
> + ret = ph->xops->do_xfer(ph, t);
> + ph->xops->xfer_put(ph, t);
> +
> + return ret;
> +}
> +
> +static int scmi_pinctrl_request(const struct scmi_protocol_handle *ph,
> + u32 identifier,
> + enum scmi_pinctrl_selector_type type)
> +{
> + int ret;
> + struct scmi_xfer *t;
> + struct scmi_msg_request *tx;
> +
> + if (type == FUNCTION_TYPE)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_validate_id(ph, identifier, type);
> + if (ret)
> + return ret;
> +
> + ret = ph->xops->xfer_get_init(ph, PINCTRL_REQUEST, sizeof(*tx), 0, &t);
> +
> + tx = t->tx.buf;
> + tx->identifier = cpu_to_le32(identifier);
> + tx->flags = cpu_to_le32(type);
> +
> + ret = ph->xops->do_xfer(ph, t);
> + ph->xops->xfer_put(ph, t);
> +
> + return ret;
> +}
> +
> +static int scmi_pinctrl_pin_request(const struct scmi_protocol_handle *ph,
> + u32 pin)
> +{
> + return scmi_pinctrl_request(ph, pin, PIN_TYPE);
> +}
> +
> +static int scmi_pinctrl_free(const struct scmi_protocol_handle *ph,
> + u32 identifier,
> + enum scmi_pinctrl_selector_type type)
> +{
> + int ret;
> + struct scmi_xfer *t;
> + struct scmi_msg_request *tx;
> +
> + if (type == FUNCTION_TYPE)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_validate_id(ph, identifier, type);
> + if (ret)
> + return ret;
> +
> + ret = ph->xops->xfer_get_init(ph, PINCTRL_RELEASE, sizeof(*tx), 0, &t);
> +
> + tx = t->tx.buf;
> + tx->identifier = cpu_to_le32(identifier);
> + tx->flags = cpu_to_le32(type);
> +
> + ret = ph->xops->do_xfer(ph, t);
> + ph->xops->xfer_put(ph, t);
> +
> + return ret;
> +}
> +
> +static int scmi_pinctrl_pin_free(const struct scmi_protocol_handle *ph, u32 pin)
> +{
> + return scmi_pinctrl_free(ph, pin, PIN_TYPE);
> +}
> +
> +static int scmi_pinctrl_get_group_info(const struct scmi_protocol_handle *ph,
> + u32 selector,
> + struct scmi_group_info *group)
> +{
> + int ret;
> +
> + if (!group)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_attributes(ph, GROUP_TYPE, selector,
> + group->name,
> + &group->nr_pins);
> + if (ret)
> + return ret;
> +
> + if (!group->nr_pins) {
> + dev_err(ph->dev, "Group %d has 0 elements", selector);
> + return -ENODATA;
> + }
> +
> + group->group_pins = kmalloc_array(group->nr_pins,
> + sizeof(*group->group_pins),
> + GFP_KERNEL);
> + if (!group->group_pins)
> + return -ENOMEM;
> +
> + ret = scmi_pinctrl_list_associations(ph, selector, GROUP_TYPE,
> + group->nr_pins, group->group_pins);
> + if (ret) {
> + kfree(group->group_pins);
> + return ret;
> + }
> +
> + group->present = true;
> + return 0;
> +}
> +
> +static int scmi_pinctrl_get_group_name(const struct scmi_protocol_handle *ph,
> + u32 selector, const char **name)
> +{
> + struct scmi_pinctrl_info *pi = ph->get_priv(ph);
> +
> + if (!name)
> + return -EINVAL;
> +
> + if (selector >= pi->nr_groups)
> + return -EINVAL;
> +
> + if (!pi->groups[selector].present) {
> + int ret;
> +
> + ret = scmi_pinctrl_get_group_info(ph, selector,
> + &pi->groups[selector]);
> + if (ret)
> + return ret;
> + }
> +
> + *name = pi->groups[selector].name;
> +
> + return 0;
> +}
> +
> +static int scmi_pinctrl_group_pins_get(const struct scmi_protocol_handle *ph,
> + u32 selector, const unsigned int **pins,
> + unsigned int *nr_pins)
> +{
> + struct scmi_pinctrl_info *pi = ph->get_priv(ph);
> +
> + if (!pins || !nr_pins)
> + return -EINVAL;
> +
> + if (selector >= pi->nr_groups)
> + return -EINVAL;
> +
> + if (!pi->groups[selector].present) {
> + int ret;
> +
> + ret = scmi_pinctrl_get_group_info(ph, selector,
> + &pi->groups[selector]);
> + if (ret)
> + return ret;
> + }
> +
> + *pins = pi->groups[selector].group_pins;
> + *nr_pins = pi->groups[selector].nr_pins;
> +
> + return 0;
> +}
> +
> +static int scmi_pinctrl_get_function_info(const struct scmi_protocol_handle *ph,
> + u32 selector,
> + struct scmi_function_info *func)
> +{
> + int ret;
> +
> + if (!func)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_attributes(ph, FUNCTION_TYPE, selector,
> + func->name,
> + &func->nr_groups);
> + if (ret)
> + return ret;
> +
> + if (!func->nr_groups) {
> + dev_err(ph->dev, "Function %d has 0 elements", selector);
> + return -ENODATA;
> + }
> +
> + func->groups = kmalloc_array(func->nr_groups, sizeof(*func->groups),
> + GFP_KERNEL);
> + if (!func->groups)
> + return -ENOMEM;
> +
> + ret = scmi_pinctrl_list_associations(ph, selector, FUNCTION_TYPE,
> + func->nr_groups, func->groups);
> + if (ret) {
> + kfree(func->groups);
> + return ret;
> + }
> +
> + func->present = true;
> + return 0;
> +}
> +
> +static int scmi_pinctrl_get_function_name(const struct scmi_protocol_handle *ph,
> + u32 selector, const char **name)
> +{
> + struct scmi_pinctrl_info *pi = ph->get_priv(ph);
> +
> + if (!name)
> + return -EINVAL;
> +
> + if (selector >= pi->nr_functions)
> + return -EINVAL;
> +
> + if (!pi->functions[selector].present) {
> + int ret;
> +
> + ret = scmi_pinctrl_get_function_info(ph, selector,
> + &pi->functions[selector]);
> + if (ret)
> + return ret;
> + }
> +
> + *name = pi->functions[selector].name;
> + return 0;
> +}
> +
> +static int
> +scmi_pinctrl_function_groups_get(const struct scmi_protocol_handle *ph,
> + u32 selector, unsigned int *nr_groups,
> + const unsigned int **groups)
> +{
> + struct scmi_pinctrl_info *pi = ph->get_priv(ph);
> +
> + if (!groups || !nr_groups)
> + return -EINVAL;
> +
> + if (selector >= pi->nr_functions)
> + return -EINVAL;
> +
> + if (!pi->functions[selector].present) {
> + int ret;
> +
> + ret = scmi_pinctrl_get_function_info(ph, selector,
> + &pi->functions[selector]);
> + if (ret)
> + return ret;
> + }
> +
> + *groups = pi->functions[selector].groups;
> + *nr_groups = pi->functions[selector].nr_groups;
> +
> + return 0;
> +}
> +
> +static int scmi_pinctrl_mux_set(const struct scmi_protocol_handle *ph,
> + u32 selector, u32 group)
> +{
> + return scmi_pinctrl_function_select(ph, group, GROUP_TYPE,
> + selector);
> +}
> +
> +static int scmi_pinctrl_get_pin_info(const struct scmi_protocol_handle *ph,
> + u32 selector, struct scmi_pin_info *pin)
> +{
> + int ret;
> +
> + if (!pin)
> + return -EINVAL;
> +
> + ret = scmi_pinctrl_attributes(ph, PIN_TYPE, selector,
> + pin->name, NULL);
> + if (ret)
> + return ret;
> +
> + pin->present = true;
> + return 0;
> +}
> +
> +static int scmi_pinctrl_get_pin_name(const struct scmi_protocol_handle *ph,
> + u32 selector, const char **name)
> +{
> + struct scmi_pinctrl_info *pi = ph->get_priv(ph);
> +
> + if (!name)
> + return -EINVAL;
> +
> + if (selector >= pi->nr_pins)
> + return -EINVAL;
> +
> + if (!pi->pins[selector].present) {
> + int ret;
> +
> + ret = scmi_pinctrl_get_pin_info(ph, selector,
> + &pi->pins[selector]);
> + if (ret)
> + return ret;
> + }
> +
> + *name = pi->pins[selector].name;
> +
> + return 0;
> +}
> +
> +static int scmi_pinctrl_name_get(const struct scmi_protocol_handle *ph,
> + u32 selector,
> + enum scmi_pinctrl_selector_type type,
> + const char **name)
> +{
> + switch (type) {
> + case PIN_TYPE:
> + return scmi_pinctrl_get_pin_name(ph, selector, name);
> + case GROUP_TYPE:
> + return scmi_pinctrl_get_group_name(ph, selector, name);
> + case FUNCTION_TYPE:
> + return scmi_pinctrl_get_function_name(ph, selector, name);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct scmi_pinctrl_proto_ops pinctrl_proto_ops = {
> + .count_get = scmi_pinctrl_count_get,
> + .name_get = scmi_pinctrl_name_get,
> + .group_pins_get = scmi_pinctrl_group_pins_get,
> + .function_groups_get = scmi_pinctrl_function_groups_get,
> + .mux_set = scmi_pinctrl_mux_set,
> + .config_get = scmi_pinctrl_config_get,
> + .config_set = scmi_pinctrl_config_set,
> + .pin_request = scmi_pinctrl_pin_request,
> + .pin_free = scmi_pinctrl_pin_free,
> +};
> +
> +static int scmi_pinctrl_protocol_init(const struct scmi_protocol_handle *ph)
> +{
> + int ret;
> + u32 version;
> + struct scmi_pinctrl_info *pinfo;
> +
> + ret = ph->xops->version_get(ph, &version);
> + if (ret)
> + return ret;
> +
> + dev_dbg(ph->dev, "Pinctrl Version %d.%d\n",
> + PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
> +
> + pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
> + if (!pinfo)
> + return -ENOMEM;
> +
> + ret = scmi_pinctrl_attributes_get(ph, pinfo);
> + if (ret)
> + return ret;
> +
> + pinfo->pins = devm_kcalloc(ph->dev, pinfo->nr_pins,
> + sizeof(*pinfo->pins),
> + GFP_KERNEL);
> + if (!pinfo->pins)
> + return -ENOMEM;
> +
> + pinfo->groups = devm_kcalloc(ph->dev, pinfo->nr_groups,
> + sizeof(*pinfo->groups),
> + GFP_KERNEL);
> + if (!pinfo->groups)
> + return -ENOMEM;
> +
> + pinfo->functions = devm_kcalloc(ph->dev, pinfo->nr_functions,
> + sizeof(*pinfo->functions),
> + GFP_KERNEL);
> + if (!pinfo->functions)
> + return -ENOMEM;
> +
> + pinfo->version = version;
> +
> + return ph->set_priv(ph, pinfo, version);
> +}
> +
> +static int scmi_pinctrl_protocol_deinit(const struct scmi_protocol_handle *ph)
> +{
> + int i;
> + struct scmi_pinctrl_info *pi = ph->get_priv(ph);
> +
> + for (i = 0; i < pi->nr_groups; i++) {
> + if (pi->groups[i].present) {
> + kfree(pi->groups[i].group_pins);
> + pi->groups[i].present = false;
> + }
> + }
> +
> + for (i = 0; i < pi->nr_functions; i++) {
> + if (pi->functions[i].present) {
> + kfree(pi->functions[i].groups);
> + pi->functions[i].present = false;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static const struct scmi_protocol scmi_pinctrl = {
> + .id = SCMI_PROTOCOL_PINCTRL,
> + .owner = THIS_MODULE,
> + .instance_init = &scmi_pinctrl_protocol_init,
> + .instance_deinit = &scmi_pinctrl_protocol_deinit,
> + .ops = &pinctrl_proto_ops,
> + .supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
> +};
> +
> +DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(pinctrl, scmi_pinctrl)
> diff --git a/drivers/firmware/arm_scmi/protocols.h b/drivers/firmware/arm_scmi/protocols.h
> index b5c65f26207b..996410962b91 100644
> --- a/drivers/firmware/arm_scmi/protocols.h
> +++ b/drivers/firmware/arm_scmi/protocols.h
> @@ -348,6 +348,7 @@ void __exit scmi_##name##_unregister(void) \
> DECLARE_SCMI_REGISTER_UNREGISTER(base);
> DECLARE_SCMI_REGISTER_UNREGISTER(clock);
> DECLARE_SCMI_REGISTER_UNREGISTER(perf);
> +DECLARE_SCMI_REGISTER_UNREGISTER(pinctrl);
> DECLARE_SCMI_REGISTER_UNREGISTER(power);
> DECLARE_SCMI_REGISTER_UNREGISTER(reset);
> DECLARE_SCMI_REGISTER_UNREGISTER(sensors);
> diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
> index f2f05fb42d28..32580a4fd724 100644
> --- a/include/linux/scmi_protocol.h
> +++ b/include/linux/scmi_protocol.h
> @@ -717,6 +717,80 @@ struct scmi_powercap_proto_ops {
> u32 *power_thresh_high);
> };
>
> +enum scmi_pinctrl_selector_type {
> + PIN_TYPE = 0,
> + GROUP_TYPE,
> + FUNCTION_TYPE,
> +};
> +
> +enum scmi_pinctrl_conf_type {
> + SCMI_PIN_NONE = 0x0,
> + SCMI_PIN_BIAS_BUS_HOLD = 0x1,
> + SCMI_PIN_BIAS_DISABLE = 0x2,
> + SCMI_PIN_BIAS_HIGH_IMPEDANCE = 0x3,
> + SCMI_PIN_BIAS_PULL_UP = 0x4,
> + SCMI_PIN_BIAS_PULL_DEFAULT = 0x5,
> + SCMI_PIN_BIAS_PULL_DOWN = 0x6,
> + SCMI_PIN_DRIVE_OPEN_DRAIN = 0x7,
> + SCMI_PIN_DRIVE_OPEN_SOURCE = 0x8,
> + SCMI_PIN_DRIVE_PUSH_PULL = 0x9,
> + SCMI_PIN_DRIVE_STRENGTH = 0xA,
> + SCMI_PIN_INPUT_DEBOUNCE = 0xB,
> + SCMI_PIN_INPUT_MODE = 0xC,
> + SCMI_PIN_PULL_MODE = 0xD,
> + SCMI_PIN_INPUT_VALUE = 0xE,
> + SCMI_PIN_INPUT_SCHMITT = 0xF,
> + SCMI_PIN_LOW_POWER_MODE = 0x10,
> + SCMI_PIN_OUTPUT_MODE = 0x11,
> + SCMI_PIN_OUTPUT_VALUE = 0x12,
> + SCMI_PIN_POWER_SOURCE = 0x13,
> + SCMI_PIN_SLEW_RATE = 0x20,
> + SCMI_PIN_OEM_START = 0xC0,
> + SCMI_PIN_OEM_END = 0xFF,
> +};
> +
> +/**
> + * struct scmi_pinctrl_proto_ops - represents the various operations provided
> + * by SCMI Pinctrl Protocol
> + *
> + * @count_get: returns count of the registered elements in given type
> + * @name_get: returns name by index of given type
> + * @group_pins_get: returns the set of pins, assigned to the specified group
> + * @function_groups_get: returns the set of groups, assigned to the specified
> + * function
> + * @mux_set: set muxing function for groups of pins
> + * @config_get: returns configuration parameter for pin or group
> + * @config_set: sets the configuration parameter for pin or group
> + * @pin_request: aquire pin before selecting mux setting
> + * @pin_free: frees pin, acquired by request_pin call
> + */
> +struct scmi_pinctrl_proto_ops {
> + int (*count_get)(const struct scmi_protocol_handle *ph,
> + enum scmi_pinctrl_selector_type type);
> + int (*name_get)(const struct scmi_protocol_handle *ph, u32 selector,
> + enum scmi_pinctrl_selector_type type,
> + const char **name);
> + int (*group_pins_get)(const struct scmi_protocol_handle *ph,
> + u32 selector, const unsigned int **pins,
> + unsigned int *nr_pins);
> + int (*function_groups_get)(const struct scmi_protocol_handle *ph,
> + u32 selector, unsigned int *nr_groups,
> + const unsigned int **groups);
> + int (*mux_set)(const struct scmi_protocol_handle *ph, u32 selector,
> + u32 group);
> + int (*config_get)(const struct scmi_protocol_handle *ph, u32 selector,
> + enum scmi_pinctrl_selector_type type,
> + enum scmi_pinctrl_conf_type config_type,
> + u32 *config_value);
> + int (*config_set)(const struct scmi_protocol_handle *ph, u32 selector,
> + enum scmi_pinctrl_selector_type type,
> + unsigned int nr_configs,
> + enum scmi_pinctrl_conf_type *config_type,
> + u32 *config_value);
> + int (*pin_request)(const struct scmi_protocol_handle *ph, u32 pin);
> + int (*pin_free)(const struct scmi_protocol_handle *ph, u32 pin);
> +};
> +
> /**
> * struct scmi_notify_ops - represents notifications' operations provided by
> * SCMI core
> @@ -824,6 +898,7 @@ enum scmi_std_protocol {
> SCMI_PROTOCOL_RESET = 0x16,
> SCMI_PROTOCOL_VOLTAGE = 0x17,
> SCMI_PROTOCOL_POWERCAP = 0x18,
> + SCMI_PROTOCOL_PINCTRL = 0x19,
> };
>
> enum scmi_system_events {
>
> --
> 2.37.1
>
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