blob: 2d2f0a43d36b409cf287f6d6629b506e517948a9 [file] [log] [blame]
/*
* Marvell MVEBU pinctrl core driver
*
* Authors: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include "pinctrl-mvebu.h"
#define MPPS_PER_REG 8
#define MPP_BITS 4
#define MPP_MASK 0xf
struct mvebu_pinctrl_function {
const char *name;
const char **groups;
unsigned num_groups;
};
struct mvebu_pinctrl_group {
const char *name;
struct mvebu_mpp_ctrl *ctrl;
struct mvebu_mpp_ctrl_setting *settings;
unsigned num_settings;
unsigned gid;
unsigned *pins;
unsigned npins;
};
struct mvebu_pinctrl {
struct device *dev;
struct pinctrl_dev *pctldev;
struct pinctrl_desc desc;
void __iomem *base;
struct mvebu_pinctrl_group *groups;
unsigned num_groups;
struct mvebu_pinctrl_function *functions;
unsigned num_functions;
u8 variant;
};
static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_pid(
struct mvebu_pinctrl *pctl, unsigned pid)
{
unsigned n;
for (n = 0; n < pctl->num_groups; n++) {
if (pid >= pctl->groups[n].pins[0] &&
pid < pctl->groups[n].pins[0] +
pctl->groups[n].npins)
return &pctl->groups[n];
}
return NULL;
}
static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_name(
struct mvebu_pinctrl *pctl, const char *name)
{
unsigned n;
for (n = 0; n < pctl->num_groups; n++) {
if (strcmp(name, pctl->groups[n].name) == 0)
return &pctl->groups[n];
}
return NULL;
}
static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_val(
struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
unsigned long config)
{
unsigned n;
for (n = 0; n < grp->num_settings; n++) {
if (config == grp->settings[n].val) {
if (!pctl->variant || (pctl->variant &
grp->settings[n].variant))
return &grp->settings[n];
}
}
return NULL;
}
static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_name(
struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
const char *name)
{
unsigned n;
for (n = 0; n < grp->num_settings; n++) {
if (strcmp(name, grp->settings[n].name) == 0) {
if (!pctl->variant || (pctl->variant &
grp->settings[n].variant))
return &grp->settings[n];
}
}
return NULL;
}
static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_gpio_setting(
struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp)
{
unsigned n;
for (n = 0; n < grp->num_settings; n++) {
if (grp->settings[n].flags &
(MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
if (!pctl->variant || (pctl->variant &
grp->settings[n].variant))
return &grp->settings[n];
}
}
return NULL;
}
static struct mvebu_pinctrl_function *mvebu_pinctrl_find_function_by_name(
struct mvebu_pinctrl *pctl, const char *name)
{
unsigned n;
for (n = 0; n < pctl->num_functions; n++) {
if (strcmp(name, pctl->functions[n].name) == 0)
return &pctl->functions[n];
}
return NULL;
}
/*
* Common mpp pin configuration registers on MVEBU are
* registers of eight 4-bit values for each mpp setting.
* Register offset and bit mask are calculated accordingly below.
*/
static int mvebu_common_mpp_get(struct mvebu_pinctrl *pctl,
struct mvebu_pinctrl_group *grp,
unsigned long *config)
{
unsigned pin = grp->gid;
unsigned off = (pin / MPPS_PER_REG) * MPP_BITS;
unsigned shift = (pin % MPPS_PER_REG) * MPP_BITS;
*config = readl(pctl->base + off);
*config >>= shift;
*config &= MPP_MASK;
return 0;
}
static int mvebu_common_mpp_set(struct mvebu_pinctrl *pctl,
struct mvebu_pinctrl_group *grp,
unsigned long config)
{
unsigned pin = grp->gid;
unsigned off = (pin / MPPS_PER_REG) * MPP_BITS;
unsigned shift = (pin % MPPS_PER_REG) * MPP_BITS;
unsigned long reg;
reg = readl(pctl->base + off);
reg &= ~(MPP_MASK << shift);
reg |= (config << shift);
writel(reg, pctl->base + off);
return 0;
}
static int mvebu_pinconf_group_get(struct pinctrl_dev *pctldev,
unsigned gid, unsigned long *config)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
if (!grp->ctrl)
return -EINVAL;
if (grp->ctrl->mpp_get)
return grp->ctrl->mpp_get(grp->ctrl, config);
return mvebu_common_mpp_get(pctl, grp, config);
}
static int mvebu_pinconf_group_set(struct pinctrl_dev *pctldev,
unsigned gid, unsigned long config)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
if (!grp->ctrl)
return -EINVAL;
if (grp->ctrl->mpp_set)
return grp->ctrl->mpp_set(grp->ctrl, config);
return mvebu_common_mpp_set(pctl, grp, config);
}
static void mvebu_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned gid)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
struct mvebu_mpp_ctrl_setting *curr;
unsigned long config;
unsigned n;
if (mvebu_pinconf_group_get(pctldev, gid, &config))
return;
curr = mvebu_pinctrl_find_setting_by_val(pctl, grp, config);
if (curr) {
seq_printf(s, "current: %s", curr->name);
if (curr->subname)
seq_printf(s, "(%s)", curr->subname);
if (curr->flags & (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
seq_printf(s, "(");
if (curr->flags & MVEBU_SETTING_GPI)
seq_printf(s, "i");
if (curr->flags & MVEBU_SETTING_GPO)
seq_printf(s, "o");
seq_printf(s, ")");
}
} else
seq_printf(s, "current: UNKNOWN");
if (grp->num_settings > 1) {
seq_printf(s, ", available = [");
for (n = 0; n < grp->num_settings; n++) {
if (curr == &grp->settings[n])
continue;
/* skip unsupported settings for this variant */
if (pctl->variant &&
!(pctl->variant & grp->settings[n].variant))
continue;
seq_printf(s, " %s", grp->settings[n].name);
if (grp->settings[n].subname)
seq_printf(s, "(%s)", grp->settings[n].subname);
if (grp->settings[n].flags &
(MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
seq_printf(s, "(");
if (grp->settings[n].flags & MVEBU_SETTING_GPI)
seq_printf(s, "i");
if (grp->settings[n].flags & MVEBU_SETTING_GPO)
seq_printf(s, "o");
seq_printf(s, ")");
}
}
seq_printf(s, " ]");
}
return;
}
static struct pinconf_ops mvebu_pinconf_ops = {
.pin_config_group_get = mvebu_pinconf_group_get,
.pin_config_group_set = mvebu_pinconf_group_set,
.pin_config_group_dbg_show = mvebu_pinconf_group_dbg_show,
};
static int mvebu_pinmux_get_funcs_count(struct pinctrl_dev *pctldev)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->num_functions;
}
static const char *mvebu_pinmux_get_func_name(struct pinctrl_dev *pctldev,
unsigned fid)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->functions[fid].name;
}
static int mvebu_pinmux_get_groups(struct pinctrl_dev *pctldev, unsigned fid,
const char * const **groups,
unsigned * const num_groups)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
*groups = pctl->functions[fid].groups;
*num_groups = pctl->functions[fid].num_groups;
return 0;
}
static int mvebu_pinmux_enable(struct pinctrl_dev *pctldev, unsigned fid,
unsigned gid)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct mvebu_pinctrl_function *func = &pctl->functions[fid];
struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
struct mvebu_mpp_ctrl_setting *setting;
int ret;
setting = mvebu_pinctrl_find_setting_by_name(pctl, grp,
func->name);
if (!setting) {
dev_err(pctl->dev,
"unable to find setting %s in group %s\n",
func->name, func->groups[gid]);
return -EINVAL;
}
ret = mvebu_pinconf_group_set(pctldev, grp->gid, setting->val);
if (ret) {
dev_err(pctl->dev, "cannot set group %s to %s\n",
func->groups[gid], func->name);
return ret;
}
return 0;
}
static int mvebu_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned offset)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct mvebu_pinctrl_group *grp;
struct mvebu_mpp_ctrl_setting *setting;
grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
if (!grp)
return -EINVAL;
if (grp->ctrl->mpp_gpio_req)
return grp->ctrl->mpp_gpio_req(grp->ctrl, offset);
setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
if (!setting)
return -ENOTSUPP;
return mvebu_pinconf_group_set(pctldev, grp->gid, setting->val);
}
static int mvebu_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned offset, bool input)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct mvebu_pinctrl_group *grp;
struct mvebu_mpp_ctrl_setting *setting;
grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
if (!grp)
return -EINVAL;
if (grp->ctrl->mpp_gpio_dir)
return grp->ctrl->mpp_gpio_dir(grp->ctrl, offset, input);
setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
if (!setting)
return -ENOTSUPP;
if ((input && (setting->flags & MVEBU_SETTING_GPI)) ||
(!input && (setting->flags & MVEBU_SETTING_GPO)))
return 0;
return -ENOTSUPP;
}
static struct pinmux_ops mvebu_pinmux_ops = {
.get_functions_count = mvebu_pinmux_get_funcs_count,
.get_function_name = mvebu_pinmux_get_func_name,
.get_function_groups = mvebu_pinmux_get_groups,
.gpio_request_enable = mvebu_pinmux_gpio_request_enable,
.gpio_set_direction = mvebu_pinmux_gpio_set_direction,
.enable = mvebu_pinmux_enable,
};
static int mvebu_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->num_groups;
}
static const char *mvebu_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned gid)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->groups[gid].name;
}
static int mvebu_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned gid, const unsigned **pins,
unsigned *num_pins)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
*pins = pctl->groups[gid].pins;
*num_pins = pctl->groups[gid].npins;
return 0;
}
static int mvebu_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map,
unsigned *num_maps)
{
struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct property *prop;
const char *function;
const char *group;
int ret, nmaps, n;
*map = NULL;
*num_maps = 0;
ret = of_property_read_string(np, "marvell,function", &function);
if (ret) {
dev_err(pctl->dev,
"missing marvell,function in node %s\n", np->name);
return 0;
}
nmaps = of_property_count_strings(np, "marvell,pins");
if (nmaps < 0) {
dev_err(pctl->dev,
"missing marvell,pins in node %s\n", np->name);
return 0;
}
*map = kmalloc(nmaps * sizeof(struct pinctrl_map), GFP_KERNEL);
if (map == NULL) {
dev_err(pctl->dev,
"cannot allocate pinctrl_map memory for %s\n",
np->name);
return -ENOMEM;
}
n = 0;
of_property_for_each_string(np, "marvell,pins", prop, group) {
struct mvebu_pinctrl_group *grp =
mvebu_pinctrl_find_group_by_name(pctl, group);
if (!grp) {
dev_err(pctl->dev, "unknown pin %s", group);
continue;
}
if (!mvebu_pinctrl_find_setting_by_name(pctl, grp, function)) {
dev_err(pctl->dev, "unsupported function %s on pin %s",
function, group);
continue;
}
(*map)[n].type = PIN_MAP_TYPE_MUX_GROUP;
(*map)[n].data.mux.group = group;
(*map)[n].data.mux.function = function;
n++;
}
*num_maps = nmaps;
return 0;
}
static void mvebu_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps)
{
kfree(map);
}
static struct pinctrl_ops mvebu_pinctrl_ops = {
.get_groups_count = mvebu_pinctrl_get_groups_count,
.get_group_name = mvebu_pinctrl_get_group_name,
.get_group_pins = mvebu_pinctrl_get_group_pins,
.dt_node_to_map = mvebu_pinctrl_dt_node_to_map,
.dt_free_map = mvebu_pinctrl_dt_free_map,
};
static int _add_function(struct mvebu_pinctrl_function *funcs, const char *name)
{
while (funcs->num_groups) {
/* function already there */
if (strcmp(funcs->name, name) == 0) {
funcs->num_groups++;
return -EEXIST;
}
funcs++;
}
funcs->name = name;
funcs->num_groups = 1;
return 0;
}
static int mvebu_pinctrl_build_functions(struct platform_device *pdev,
struct mvebu_pinctrl *pctl)
{
struct mvebu_pinctrl_function *funcs;
int num = 0;
int n, s;
/* we allocate functions for number of pins and hope
* there are less unique functions than pins available */
funcs = devm_kzalloc(&pdev->dev, pctl->desc.npins *
sizeof(struct mvebu_pinctrl_function), GFP_KERNEL);
if (!funcs)
return -ENOMEM;
for (n = 0; n < pctl->num_groups; n++) {
struct mvebu_pinctrl_group *grp = &pctl->groups[n];
for (s = 0; s < grp->num_settings; s++) {
/* skip unsupported settings on this variant */
if (pctl->variant &&
!(pctl->variant & grp->settings[s].variant))
continue;
/* check for unique functions and count groups */
if (_add_function(funcs, grp->settings[s].name))
continue;
num++;
}
}
/* with the number of unique functions and it's groups known,
reallocate functions and assign group names */
funcs = krealloc(funcs, num * sizeof(struct mvebu_pinctrl_function),
GFP_KERNEL);
if (!funcs)
return -ENOMEM;
pctl->num_functions = num;
pctl->functions = funcs;
for (n = 0; n < pctl->num_groups; n++) {
struct mvebu_pinctrl_group *grp = &pctl->groups[n];
for (s = 0; s < grp->num_settings; s++) {
struct mvebu_pinctrl_function *f;
const char **groups;
/* skip unsupported settings on this variant */
if (pctl->variant &&
!(pctl->variant & grp->settings[s].variant))
continue;
f = mvebu_pinctrl_find_function_by_name(pctl,
grp->settings[s].name);
/* allocate group name array if not done already */
if (!f->groups) {
f->groups = devm_kzalloc(&pdev->dev,
f->num_groups * sizeof(char *),
GFP_KERNEL);
if (!f->groups)
return -ENOMEM;
}
/* find next free group name and assign current name */
groups = f->groups;
while (*groups)
groups++;
*groups = grp->name;
}
}
return 0;
}
int mvebu_pinctrl_probe(struct platform_device *pdev)
{
struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev);
struct device_node *np = pdev->dev.of_node;
struct mvebu_pinctrl *pctl;
void __iomem *base;
struct pinctrl_pin_desc *pdesc;
unsigned gid, n, k;
int ret;
if (!soc || !soc->controls || !soc->modes) {
dev_err(&pdev->dev, "wrong pinctrl soc info\n");
return -EINVAL;
}
base = of_iomap(np, 0);
if (!base) {
dev_err(&pdev->dev, "unable to get base address\n");
return -ENODEV;
}
pctl = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pinctrl),
GFP_KERNEL);
if (!pctl) {
dev_err(&pdev->dev, "unable to alloc driver\n");
return -ENOMEM;
}
pctl->desc.name = dev_name(&pdev->dev);
pctl->desc.owner = THIS_MODULE;
pctl->desc.pctlops = &mvebu_pinctrl_ops;
pctl->desc.pmxops = &mvebu_pinmux_ops;
pctl->desc.confops = &mvebu_pinconf_ops;
pctl->variant = soc->variant;
pctl->base = base;
pctl->dev = &pdev->dev;
platform_set_drvdata(pdev, pctl);
/* count controls and create names for mvebu generic
register controls; also does sanity checks */
pctl->num_groups = 0;
pctl->desc.npins = 0;
for (n = 0; n < soc->ncontrols; n++) {
struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];
char *names;
pctl->desc.npins += ctrl->npins;
/* initial control pins */
for (k = 0; k < ctrl->npins; k++)
ctrl->pins[k] = ctrl->pid + k;
/* special soc specific control */
if (ctrl->mpp_get || ctrl->mpp_set) {
if (!ctrl->name || !ctrl->mpp_get || !ctrl->mpp_set) {
dev_err(&pdev->dev, "wrong soc control info\n");
return -EINVAL;
}
pctl->num_groups += 1;
continue;
}
/* generic mvebu register control */
names = devm_kzalloc(&pdev->dev, ctrl->npins * 8, GFP_KERNEL);
if (!names) {
dev_err(&pdev->dev, "failed to alloc mpp names\n");
return -ENOMEM;
}
for (k = 0; k < ctrl->npins; k++)
sprintf(names + 8*k, "mpp%d", ctrl->pid+k);
ctrl->name = names;
pctl->num_groups += ctrl->npins;
}
pdesc = devm_kzalloc(&pdev->dev, pctl->desc.npins *
sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
if (!pdesc) {
dev_err(&pdev->dev, "failed to alloc pinctrl pins\n");
return -ENOMEM;
}
for (n = 0; n < pctl->desc.npins; n++)
pdesc[n].number = n;
pctl->desc.pins = pdesc;
pctl->groups = devm_kzalloc(&pdev->dev, pctl->num_groups *
sizeof(struct mvebu_pinctrl_group), GFP_KERNEL);
if (!pctl->groups) {
dev_err(&pdev->dev, "failed to alloc pinctrl groups\n");
return -ENOMEM;
}
/* assign mpp controls to groups */
gid = 0;
for (n = 0; n < soc->ncontrols; n++) {
struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];
pctl->groups[gid].gid = gid;
pctl->groups[gid].ctrl = ctrl;
pctl->groups[gid].name = ctrl->name;
pctl->groups[gid].pins = ctrl->pins;
pctl->groups[gid].npins = ctrl->npins;
/* generic mvebu register control maps to a number of groups */
if (!ctrl->mpp_get && !ctrl->mpp_set) {
pctl->groups[gid].npins = 1;
for (k = 1; k < ctrl->npins; k++) {
gid++;
pctl->groups[gid].gid = gid;
pctl->groups[gid].ctrl = ctrl;
pctl->groups[gid].name = &ctrl->name[8*k];
pctl->groups[gid].pins = &ctrl->pins[k];
pctl->groups[gid].npins = 1;
}
}
gid++;
}
/* assign mpp modes to groups */
for (n = 0; n < soc->nmodes; n++) {
struct mvebu_mpp_mode *mode = &soc->modes[n];
struct mvebu_pinctrl_group *grp =
mvebu_pinctrl_find_group_by_pid(pctl, mode->pid);
unsigned num_settings;
if (!grp) {
dev_warn(&pdev->dev, "unknown pinctrl group %d\n",
mode->pid);
continue;
}
for (num_settings = 0; ;) {
struct mvebu_mpp_ctrl_setting *set =
&mode->settings[num_settings];
if (!set->name)
break;
num_settings++;
/* skip unsupported settings for this variant */
if (pctl->variant && !(pctl->variant & set->variant))
continue;
/* find gpio/gpo/gpi settings */
if (strcmp(set->name, "gpio") == 0)
set->flags = MVEBU_SETTING_GPI |
MVEBU_SETTING_GPO;
else if (strcmp(set->name, "gpo") == 0)
set->flags = MVEBU_SETTING_GPO;
else if (strcmp(set->name, "gpi") == 0)
set->flags = MVEBU_SETTING_GPI;
}
grp->settings = mode->settings;
grp->num_settings = num_settings;
}
ret = mvebu_pinctrl_build_functions(pdev, pctl);
if (ret) {
dev_err(&pdev->dev, "unable to build functions\n");
return ret;
}
pctl->pctldev = pinctrl_register(&pctl->desc, &pdev->dev, pctl);
if (!pctl->pctldev) {
dev_err(&pdev->dev, "unable to register pinctrl driver\n");
return -EINVAL;
}
dev_info(&pdev->dev, "registered pinctrl driver\n");
/* register gpio ranges */
for (n = 0; n < soc->ngpioranges; n++)
pinctrl_add_gpio_range(pctl->pctldev, &soc->gpioranges[n]);
return 0;
}
int mvebu_pinctrl_remove(struct platform_device *pdev)
{
struct mvebu_pinctrl *pctl = platform_get_drvdata(pdev);
pinctrl_unregister(pctl->pctldev);
return 0;
}