blob: bbde676b7313ab215546e7dfa07c431dec6cd33b [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* ZynqMP pin controller
*
* Copyright (C) 2020, 2021 Xilinx, Inc.
*
* Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@xilinx.com>
* Rajan Vaja <rajan.vaja@xilinx.com>
*/
#include <dt-bindings/pinctrl/pinctrl-zynqmp.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/firmware/xlnx-zynqmp.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf-generic.h>
#include "core.h"
#include "pinctrl-utils.h"
#define ZYNQMP_PIN_PREFIX "MIO"
#define PINCTRL_GET_FUNC_NAME_RESP_LEN 16
#define MAX_FUNC_NAME_LEN 16
#define MAX_GROUP_PIN 50
#define MAX_PIN_GROUPS 50
#define END_OF_FUNCTIONS "END_OF_FUNCTIONS"
#define NUM_GROUPS_PER_RESP 6
#define PINCTRL_GET_FUNC_GROUPS_RESP_LEN 12
#define PINCTRL_GET_PIN_GROUPS_RESP_LEN 12
#define NA_GROUP 0xFFFF
#define RESERVED_GROUP 0xFFFE
#define DRIVE_STRENGTH_2MA 2
#define DRIVE_STRENGTH_4MA 4
#define DRIVE_STRENGTH_8MA 8
#define DRIVE_STRENGTH_12MA 12
/**
* struct zynqmp_pmux_function - a pinmux function
* @name: Name of the pin mux function
* @groups: List of pin groups for this function
* @ngroups: Number of entries in @groups
* @node: Firmware node matching with the function
*
* This structure holds information about pin control function
* and function group names supporting that function.
*/
struct zynqmp_pmux_function {
char name[MAX_FUNC_NAME_LEN];
const char * const *groups;
unsigned int ngroups;
};
/**
* struct zynqmp_pinctrl - driver data
* @pctrl: Pin control device
* @groups: Pin groups
* @ngroups: Number of @groups
* @funcs: Pin mux functions
* @nfuncs: Number of @funcs
*
* This struct is stored as driver data and used to retrieve
* information regarding pin control functions, groups and
* group pins.
*/
struct zynqmp_pinctrl {
struct pinctrl_dev *pctrl;
const struct zynqmp_pctrl_group *groups;
unsigned int ngroups;
const struct zynqmp_pmux_function *funcs;
unsigned int nfuncs;
};
/**
* struct zynqmp_pctrl_group - Pin control group info
* @name: Group name
* @pins: Group pin numbers
* @npins: Number of pins in the group
*/
struct zynqmp_pctrl_group {
const char *name;
unsigned int pins[MAX_GROUP_PIN];
unsigned int npins;
};
static struct pinctrl_desc zynqmp_desc;
static int zynqmp_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
return pctrl->ngroups;
}
static const char *zynqmp_pctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
return pctrl->groups[selector].name;
}
static int zynqmp_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int selector,
const unsigned int **pins,
unsigned int *npins)
{
struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
*pins = pctrl->groups[selector].pins;
*npins = pctrl->groups[selector].npins;
return 0;
}
static const struct pinctrl_ops zynqmp_pctrl_ops = {
.get_groups_count = zynqmp_pctrl_get_groups_count,
.get_group_name = zynqmp_pctrl_get_group_name,
.get_group_pins = zynqmp_pctrl_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
.dt_free_map = pinctrl_utils_free_map,
};
static int zynqmp_pinmux_request_pin(struct pinctrl_dev *pctldev,
unsigned int pin)
{
int ret;
ret = zynqmp_pm_pinctrl_request(pin);
if (ret) {
dev_err(pctldev->dev, "request failed for pin %u\n", pin);
return ret;
}
return 0;
}
static int zynqmp_pmux_get_functions_count(struct pinctrl_dev *pctldev)
{
struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
return pctrl->nfuncs;
}
static const char *zynqmp_pmux_get_function_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
return pctrl->funcs[selector].name;
}
/**
* zynqmp_pmux_get_function_groups() - Get groups for the function
* @pctldev: Pincontrol device pointer.
* @selector: Function ID
* @groups: Group names.
* @num_groups: Number of function groups.
*
* Get function's group count and group names.
*/
static int zynqmp_pmux_get_function_groups(struct pinctrl_dev *pctldev,
unsigned int selector,
const char * const **groups,
unsigned * const num_groups)
{
struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
*groups = pctrl->funcs[selector].groups;
*num_groups = pctrl->funcs[selector].ngroups;
return 0;
}
/**
* zynqmp_pinmux_set_mux() - Set requested function for the group
* @pctldev: Pincontrol device pointer.
* @function: Function ID.
* @group: Group ID.
*
* Loop through all pins of the group and call firmware API
* to set requested function for all pins in the group.
*
* Return: 0 on success else error code.
*/
static int zynqmp_pinmux_set_mux(struct pinctrl_dev *pctldev,
unsigned int function,
unsigned int group)
{
struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
const struct zynqmp_pctrl_group *pgrp = &pctrl->groups[group];
int ret, i;
for (i = 0; i < pgrp->npins; i++) {
unsigned int pin = pgrp->pins[i];
ret = zynqmp_pm_pinctrl_set_function(pin, function);
if (ret) {
dev_err(pctldev->dev, "set mux failed for pin %u\n",
pin);
return ret;
}
}
return 0;
}
static int zynqmp_pinmux_release_pin(struct pinctrl_dev *pctldev,
unsigned int pin)
{
int ret;
ret = zynqmp_pm_pinctrl_release(pin);
if (ret) {
dev_err(pctldev->dev, "free pin failed for pin %u\n",
pin);
return ret;
}
return 0;
}
static const struct pinmux_ops zynqmp_pinmux_ops = {
.request = zynqmp_pinmux_request_pin,
.get_functions_count = zynqmp_pmux_get_functions_count,
.get_function_name = zynqmp_pmux_get_function_name,
.get_function_groups = zynqmp_pmux_get_function_groups,
.set_mux = zynqmp_pinmux_set_mux,
.free = zynqmp_pinmux_release_pin,
};
/**
* zynqmp_pinconf_cfg_get() - get config value for the pin
* @pctldev: Pin control device pointer.
* @pin: Pin number.
* @config: Value of config param.
*
* Get value of the requested configuration parameter for the
* given pin.
*
* Return: 0 on success else error code.
*/
static int zynqmp_pinconf_cfg_get(struct pinctrl_dev *pctldev,
unsigned int pin,
unsigned long *config)
{
unsigned int arg, param = pinconf_to_config_param(*config);
int ret;
switch (param) {
case PIN_CONFIG_SLEW_RATE:
param = PM_PINCTRL_CONFIG_SLEW_RATE;
ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
break;
case PIN_CONFIG_BIAS_PULL_UP:
param = PM_PINCTRL_CONFIG_PULL_CTRL;
ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
if (arg != PM_PINCTRL_BIAS_PULL_UP)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
param = PM_PINCTRL_CONFIG_PULL_CTRL;
ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
if (arg != PM_PINCTRL_BIAS_PULL_DOWN)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_DISABLE:
param = PM_PINCTRL_CONFIG_BIAS_STATUS;
ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
if (arg != PM_PINCTRL_BIAS_DISABLE)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_POWER_SOURCE:
param = PM_PINCTRL_CONFIG_VOLTAGE_STATUS;
ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
break;
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
param = PM_PINCTRL_CONFIG_SCHMITT_CMOS;
ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
break;
case PIN_CONFIG_DRIVE_STRENGTH:
param = PM_PINCTRL_CONFIG_DRIVE_STRENGTH;
ret = zynqmp_pm_pinctrl_get_config(pin, param, &arg);
switch (arg) {
case PM_PINCTRL_DRIVE_STRENGTH_2MA:
arg = DRIVE_STRENGTH_2MA;
break;
case PM_PINCTRL_DRIVE_STRENGTH_4MA:
arg = DRIVE_STRENGTH_4MA;
break;
case PM_PINCTRL_DRIVE_STRENGTH_8MA:
arg = DRIVE_STRENGTH_8MA;
break;
case PM_PINCTRL_DRIVE_STRENGTH_12MA:
arg = DRIVE_STRENGTH_12MA;
break;
default:
/* Invalid drive strength */
dev_warn(pctldev->dev,
"Invalid drive strength for pin %d\n",
pin);
return -EINVAL;
}
break;
default:
ret = -ENOTSUPP;
break;
}
if (ret)
return ret;
param = pinconf_to_config_param(*config);
*config = pinconf_to_config_packed(param, arg);
return 0;
}
/**
* zynqmp_pinconf_cfg_set() - Set requested config for the pin
* @pctldev: Pincontrol device pointer.
* @pin: Pin number.
* @configs: Configuration to set.
* @num_configs: Number of configurations.
*
* Loop through all configurations and call firmware API
* to set requested configurations for the pin.
*
* Return: 0 on success else error code.
*/
static int zynqmp_pinconf_cfg_set(struct pinctrl_dev *pctldev,
unsigned int pin, unsigned long *configs,
unsigned int num_configs)
{
int i, ret;
for (i = 0; i < num_configs; i++) {
unsigned int param = pinconf_to_config_param(configs[i]);
unsigned int arg = pinconf_to_config_argument(configs[i]);
unsigned int value;
switch (param) {
case PIN_CONFIG_SLEW_RATE:
param = PM_PINCTRL_CONFIG_SLEW_RATE;
ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
break;
case PIN_CONFIG_BIAS_PULL_UP:
param = PM_PINCTRL_CONFIG_PULL_CTRL;
arg = PM_PINCTRL_BIAS_PULL_UP;
ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
param = PM_PINCTRL_CONFIG_PULL_CTRL;
arg = PM_PINCTRL_BIAS_PULL_DOWN;
ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
break;
case PIN_CONFIG_BIAS_DISABLE:
param = PM_PINCTRL_CONFIG_BIAS_STATUS;
arg = PM_PINCTRL_BIAS_DISABLE;
ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
break;
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
param = PM_PINCTRL_CONFIG_SCHMITT_CMOS;
ret = zynqmp_pm_pinctrl_set_config(pin, param, arg);
break;
case PIN_CONFIG_DRIVE_STRENGTH:
switch (arg) {
case DRIVE_STRENGTH_2MA:
value = PM_PINCTRL_DRIVE_STRENGTH_2MA;
break;
case DRIVE_STRENGTH_4MA:
value = PM_PINCTRL_DRIVE_STRENGTH_4MA;
break;
case DRIVE_STRENGTH_8MA:
value = PM_PINCTRL_DRIVE_STRENGTH_8MA;
break;
case DRIVE_STRENGTH_12MA:
value = PM_PINCTRL_DRIVE_STRENGTH_12MA;
break;
default:
/* Invalid drive strength */
dev_warn(pctldev->dev,
"Invalid drive strength for pin %d\n",
pin);
return -EINVAL;
}
param = PM_PINCTRL_CONFIG_DRIVE_STRENGTH;
ret = zynqmp_pm_pinctrl_set_config(pin, param, value);
break;
case PIN_CONFIG_POWER_SOURCE:
param = PM_PINCTRL_CONFIG_VOLTAGE_STATUS;
ret = zynqmp_pm_pinctrl_get_config(pin, param, &value);
if (arg != value)
dev_warn(pctldev->dev,
"Invalid IO Standard requested for pin %d\n",
pin);
break;
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
case PIN_CONFIG_MODE_LOW_POWER:
/*
* These cases are mentioned in dts but configurable
* registers are unknown. So falling through to ignore
* boot time warnings as of now.
*/
ret = 0;
break;
default:
dev_warn(pctldev->dev,
"unsupported configuration parameter '%u'\n",
param);
ret = -ENOTSUPP;
break;
}
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
if (ret)
dev_warn(pctldev->dev,
"failed to set: pin %u param %u value %u\n",
pin, param, arg);
}
return 0;
}
/**
* zynqmp_pinconf_group_set() - Set requested config for the group
* @pctldev: Pincontrol device pointer.
* @selector: Group ID.
* @configs: Configuration to set.
* @num_configs: Number of configurations.
*
* Call function to set configs for each pin in the group.
*
* Return: 0 on success else error code.
*/
static int zynqmp_pinconf_group_set(struct pinctrl_dev *pctldev,
unsigned int selector,
unsigned long *configs,
unsigned int num_configs)
{
int i, ret;
struct zynqmp_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
const struct zynqmp_pctrl_group *pgrp = &pctrl->groups[selector];
for (i = 0; i < pgrp->npins; i++) {
ret = zynqmp_pinconf_cfg_set(pctldev, pgrp->pins[i], configs,
num_configs);
if (ret)
return ret;
}
return 0;
}
static const struct pinconf_ops zynqmp_pinconf_ops = {
.is_generic = true,
.pin_config_get = zynqmp_pinconf_cfg_get,
.pin_config_set = zynqmp_pinconf_cfg_set,
.pin_config_group_set = zynqmp_pinconf_group_set,
};
static struct pinctrl_desc zynqmp_desc = {
.name = "zynqmp_pinctrl",
.owner = THIS_MODULE,
.pctlops = &zynqmp_pctrl_ops,
.pmxops = &zynqmp_pinmux_ops,
.confops = &zynqmp_pinconf_ops,
};
static int zynqmp_pinctrl_get_function_groups(u32 fid, u32 index, u16 *groups)
{
struct zynqmp_pm_query_data qdata = {0};
u32 payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_PINCTRL_GET_FUNCTION_GROUPS;
qdata.arg1 = fid;
qdata.arg2 = index;
ret = zynqmp_pm_query_data(qdata, payload);
if (ret)
return ret;
memcpy(groups, &payload[1], PINCTRL_GET_FUNC_GROUPS_RESP_LEN);
return 0;
}
static int zynqmp_pinctrl_get_func_num_groups(u32 fid, unsigned int *ngroups)
{
struct zynqmp_pm_query_data qdata = {0};
u32 payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_PINCTRL_GET_NUM_FUNCTION_GROUPS;
qdata.arg1 = fid;
ret = zynqmp_pm_query_data(qdata, payload);
if (ret)
return ret;
*ngroups = payload[1];
return 0;
}
/**
* zynqmp_pinctrl_prepare_func_groups() - prepare function and groups data
* @dev: Device pointer.
* @fid: Function ID.
* @func: Function data.
* @groups: Groups data.
*
* Query firmware to get group IDs for each function. Firmware returns
* group IDs. Based on the group index for the function, group names in
* the function are stored. For example, the first group in "eth0" function
* is named as "eth0_0" and the second group as "eth0_1" and so on.
*
* Based on the group ID received from the firmware, function stores name of
* the group for that group ID. For example, if "eth0" first group ID
* is x, groups[x] name will be stored as "eth0_0".
*
* Once done for each function, each function would have its group names
* and each group would also have their names.
*
* Return: 0 on success else error code.
*/
static int zynqmp_pinctrl_prepare_func_groups(struct device *dev, u32 fid,
struct zynqmp_pmux_function *func,
struct zynqmp_pctrl_group *groups)
{
u16 resp[NUM_GROUPS_PER_RESP] = {0};
const char **fgroups;
int ret, index, i;
fgroups = devm_kzalloc(dev, sizeof(*fgroups) * func->ngroups, GFP_KERNEL);
if (!fgroups)
return -ENOMEM;
for (index = 0; index < func->ngroups; index += NUM_GROUPS_PER_RESP) {
ret = zynqmp_pinctrl_get_function_groups(fid, index, resp);
if (ret)
return ret;
for (i = 0; i < NUM_GROUPS_PER_RESP; i++) {
if (resp[i] == NA_GROUP)
goto done;
if (resp[i] == RESERVED_GROUP)
continue;
fgroups[index + i] = devm_kasprintf(dev, GFP_KERNEL,
"%s_%d_grp",
func->name,
index + i);
if (!fgroups[index + i])
return -ENOMEM;
groups[resp[i]].name = devm_kasprintf(dev, GFP_KERNEL,
"%s_%d_grp",
func->name,
index + i);
if (!groups[resp[i]].name)
return -ENOMEM;
}
}
done:
func->groups = fgroups;
return 0;
}
static void zynqmp_pinctrl_get_function_name(u32 fid, char *name)
{
struct zynqmp_pm_query_data qdata = {0};
u32 payload[PAYLOAD_ARG_CNT];
qdata.qid = PM_QID_PINCTRL_GET_FUNCTION_NAME;
qdata.arg1 = fid;
/*
* Name of the function is maximum 16 bytes and cannot
* accommodate the return value in SMC buffers, hence ignoring
* the return value for this specific qid.
*/
zynqmp_pm_query_data(qdata, payload);
memcpy(name, payload, PINCTRL_GET_FUNC_NAME_RESP_LEN);
}
static int zynqmp_pinctrl_get_num_functions(unsigned int *nfuncs)
{
struct zynqmp_pm_query_data qdata = {0};
u32 payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_PINCTRL_GET_NUM_FUNCTIONS;
ret = zynqmp_pm_query_data(qdata, payload);
if (ret)
return ret;
*nfuncs = payload[1];
return 0;
}
static int zynqmp_pinctrl_get_pin_groups(u32 pin, u32 index, u16 *groups)
{
struct zynqmp_pm_query_data qdata = {0};
u32 payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_PINCTRL_GET_PIN_GROUPS;
qdata.arg1 = pin;
qdata.arg2 = index;
ret = zynqmp_pm_query_data(qdata, payload);
if (ret)
return ret;
memcpy(groups, &payload[1], PINCTRL_GET_PIN_GROUPS_RESP_LEN);
return 0;
}
static void zynqmp_pinctrl_group_add_pin(struct zynqmp_pctrl_group *group,
unsigned int pin)
{
group->pins[group->npins++] = pin;
}
/**
* zynqmp_pinctrl_create_pin_groups() - assign pins to respective groups
* @dev: Device pointer.
* @groups: Groups data.
* @pin: Pin number.
*
* Query firmware to get groups available for the given pin.
* Based on the firmware response(group IDs for the pin), add
* pin number to the respective group's pin array.
*
* Once all pins are queries, each group would have its number
* of pins and pin numbers data.
*
* Return: 0 on success else error code.
*/
static int zynqmp_pinctrl_create_pin_groups(struct device *dev,
struct zynqmp_pctrl_group *groups,
unsigned int pin)
{
u16 resp[NUM_GROUPS_PER_RESP] = {0};
int ret, i, index = 0;
do {
ret = zynqmp_pinctrl_get_pin_groups(pin, index, resp);
if (ret)
return ret;
for (i = 0; i < NUM_GROUPS_PER_RESP; i++) {
if (resp[i] == NA_GROUP)
return ret;
if (resp[i] == RESERVED_GROUP)
continue;
zynqmp_pinctrl_group_add_pin(&groups[resp[i]], pin);
}
index += NUM_GROUPS_PER_RESP;
} while (index <= MAX_PIN_GROUPS);
return 0;
}
/**
* zynqmp_pinctrl_prepare_group_pins() - prepare each group's pin data
* @dev: Device pointer.
* @groups: Groups data.
* @ngroups: Number of groups.
*
* Prepare pin number and number of pins data for each pins.
*
* Return: 0 on success else error code.
*/
static int zynqmp_pinctrl_prepare_group_pins(struct device *dev,
struct zynqmp_pctrl_group *groups,
unsigned int ngroups)
{
unsigned int pin;
int ret;
for (pin = 0; pin < zynqmp_desc.npins; pin++) {
ret = zynqmp_pinctrl_create_pin_groups(dev, groups, pin);
if (ret)
return ret;
}
return 0;
}
/**
* zynqmp_pinctrl_prepare_function_info() - prepare function info
* @dev: Device pointer.
* @pctrl: Pin control driver data.
*
* Query firmware for functions, groups and pin information and
* prepare pin control driver data.
*
* Query number of functions and number of function groups (number
* of groups in the given function) to allocate required memory buffers
* for functions and groups. Once buffers are allocated to store
* functions and groups data, query and store required information
* (number of groups and group names for each function, number of
* pins and pin numbers for each group).
*
* Return: 0 on success else error code.
*/
static int zynqmp_pinctrl_prepare_function_info(struct device *dev,
struct zynqmp_pinctrl *pctrl)
{
struct zynqmp_pmux_function *funcs;
struct zynqmp_pctrl_group *groups;
int ret, i;
ret = zynqmp_pinctrl_get_num_functions(&pctrl->nfuncs);
if (ret)
return ret;
funcs = devm_kzalloc(dev, sizeof(*funcs) * pctrl->nfuncs, GFP_KERNEL);
if (!funcs)
return -ENOMEM;
for (i = 0; i < pctrl->nfuncs; i++) {
zynqmp_pinctrl_get_function_name(i, funcs[i].name);
ret = zynqmp_pinctrl_get_func_num_groups(i, &funcs[i].ngroups);
if (ret)
return ret;
pctrl->ngroups += funcs[i].ngroups;
}
groups = devm_kzalloc(dev, sizeof(*groups) * pctrl->ngroups, GFP_KERNEL);
if (!groups)
return -ENOMEM;
for (i = 0; i < pctrl->nfuncs; i++) {
ret = zynqmp_pinctrl_prepare_func_groups(dev, i, &funcs[i],
groups);
if (ret)
return ret;
}
ret = zynqmp_pinctrl_prepare_group_pins(dev, groups, pctrl->ngroups);
if (ret)
return ret;
pctrl->funcs = funcs;
pctrl->groups = groups;
return 0;
}
static int zynqmp_pinctrl_get_num_pins(unsigned int *npins)
{
struct zynqmp_pm_query_data qdata = {0};
u32 payload[PAYLOAD_ARG_CNT];
int ret;
qdata.qid = PM_QID_PINCTRL_GET_NUM_PINS;
ret = zynqmp_pm_query_data(qdata, payload);
if (ret)
return ret;
*npins = payload[1];
return 0;
}
/**
* zynqmp_pinctrl_prepare_pin_desc() - prepare pin description info
* @dev: Device pointer.
* @zynqmp_pins: Pin information.
* @npins: Number of pins.
*
* Query number of pins information from firmware and prepare pin
* description containing pin number and pin name.
*
* Return: 0 on success else error code.
*/
static int zynqmp_pinctrl_prepare_pin_desc(struct device *dev,
const struct pinctrl_pin_desc
**zynqmp_pins,
unsigned int *npins)
{
struct pinctrl_pin_desc *pins, *pin;
int ret;
int i;
ret = zynqmp_pinctrl_get_num_pins(npins);
if (ret)
return ret;
pins = devm_kzalloc(dev, sizeof(*pins) * *npins, GFP_KERNEL);
if (!pins)
return -ENOMEM;
for (i = 0; i < *npins; i++) {
pin = &pins[i];
pin->number = i;
pin->name = devm_kasprintf(dev, GFP_KERNEL, "%s%d",
ZYNQMP_PIN_PREFIX, i);
if (!pin->name)
return -ENOMEM;
}
*zynqmp_pins = pins;
return 0;
}
static int zynqmp_pinctrl_probe(struct platform_device *pdev)
{
struct zynqmp_pinctrl *pctrl;
int ret;
pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
if (!pctrl)
return -ENOMEM;
ret = zynqmp_pinctrl_prepare_pin_desc(&pdev->dev,
&zynqmp_desc.pins,
&zynqmp_desc.npins);
if (ret) {
dev_err(&pdev->dev, "pin desc prepare fail with %d\n", ret);
return ret;
}
ret = zynqmp_pinctrl_prepare_function_info(&pdev->dev, pctrl);
if (ret) {
dev_err(&pdev->dev, "function info prepare fail with %d\n", ret);
return ret;
}
pctrl->pctrl = devm_pinctrl_register(&pdev->dev, &zynqmp_desc, pctrl);
if (IS_ERR(pctrl->pctrl))
return PTR_ERR(pctrl->pctrl);
platform_set_drvdata(pdev, pctrl);
return ret;
}
static int zynqmp_pinctrl_remove(struct platform_device *pdev)
{
struct zynqmp_pinctrl *pctrl = platform_get_drvdata(pdev);
pinctrl_unregister(pctrl->pctrl);
return 0;
}
static const struct of_device_id zynqmp_pinctrl_of_match[] = {
{ .compatible = "xlnx,zynqmp-pinctrl" },
{ }
};
MODULE_DEVICE_TABLE(of, zynqmp_pinctrl_of_match);
static struct platform_driver zynqmp_pinctrl_driver = {
.driver = {
.name = "zynqmp-pinctrl",
.of_match_table = zynqmp_pinctrl_of_match,
},
.probe = zynqmp_pinctrl_probe,
.remove = zynqmp_pinctrl_remove,
};
module_platform_driver(zynqmp_pinctrl_driver);
MODULE_AUTHOR("Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@xilinx.com>");
MODULE_DESCRIPTION("ZynqMP Pin Controller Driver");
MODULE_LICENSE("GPL v2");