Release 4.7 drivers/pinctrl/spear/pinctrl-spear.c
/*
* Driver for the ST Microelectronics SPEAr pinmux
*
* Copyright (C) 2012 ST Microelectronics
* Viresh Kumar <vireshk@kernel.org>
*
* Inspired from:
* - U300 Pinctl drivers
* - Tegra Pinctl drivers
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "pinctrl-spear.h"
#define DRIVER_NAME "spear-pinmux"
static void muxregs_endisable(struct spear_pmx *pmx,
struct spear_muxreg *muxregs, u8 count, bool enable)
{
struct spear_muxreg *muxreg;
u32 val, temp, j;
for (j = 0; j < count; j++) {
muxreg = &muxregs[j];
val = pmx_readl(pmx, muxreg->reg);
val &= ~muxreg->mask;
if (enable)
temp = muxreg->val;
else
temp = ~muxreg->val;
val |= muxreg->mask & temp;
pmx_writel(pmx, val, muxreg->reg);
}
}
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static int set_mode(struct spear_pmx *pmx, int mode)
{
struct spear_pmx_mode *pmx_mode = NULL;
int i;
u32 val;
if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes)
return -EINVAL;
for (i = 0; i < pmx->machdata->npmx_modes; i++) {
if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) {
pmx_mode = pmx->machdata->pmx_modes[i];
break;
}
}
if (!pmx_mode)
return -EINVAL;
val = pmx_readl(pmx, pmx_mode->reg);
val &= ~pmx_mode->mask;
val |= pmx_mode->val;
pmx_writel(pmx, val, pmx_mode->reg);
pmx->machdata->mode = pmx_mode->mode;
dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n",
pmx_mode->name ? pmx_mode->name : "no_name",
pmx_mode->reg);
return 0;
}
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void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup,
unsigned count, u16 reg)
{
int i, j;
for (i = 0; i < count; i++)
for (j = 0; j < gpio_pingroup[i].nmuxregs; j++)
gpio_pingroup[i].muxregs[j].reg = reg;
}
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void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)
{
struct spear_pingroup *pgroup;
struct spear_modemux *modemux;
int i, j, group;
for (group = 0; group < machdata->ngroups; group++) {
pgroup = machdata->groups[group];
for (i = 0; i < pgroup->nmodemuxs; i++) {
modemux = &pgroup->modemuxs[i];
for (j = 0; j < modemux->nmuxregs; j++)
if (modemux->muxregs[j].reg == 0xFFFF)
modemux->muxregs[j].reg = reg;
}
}
}
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static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->machdata->ngroups;
}
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static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned group)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->machdata->groups[group]->name;
}
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static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned group, const unsigned **pins, unsigned *num_pins)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
*pins = pmx->machdata->groups[group]->pins;
*num_pins = pmx->machdata->groups[group]->npins;
return 0;
}
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static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned offset)
{
seq_printf(s, " " DRIVER_NAME);
}
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static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map,
unsigned *num_maps)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
struct device_node *np;
struct property *prop;
const char *function, *group;
int ret, index = 0, count = 0;
/* calculate number of maps required */
for_each_child_of_node(np_config, np) {
ret = of_property_read_string(np, "st,function", &function);
if (ret < 0)
return ret;
ret = of_property_count_strings(np, "st,pins");
if (ret < 0)
return ret;
count += ret;
}
if (!count) {
dev_err(pmx->dev, "No child nodes passed via DT\n");
return -ENODEV;
}
*map = kzalloc(sizeof(**map) * count, GFP_KERNEL);
if (!*map)
return -ENOMEM;
for_each_child_of_node(np_config, np) {
of_property_read_string(np, "st,function", &function);
of_property_for_each_string(np, "st,pins", prop, group) {
(*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
(*map)[index].data.mux.group = group;
(*map)[index].data.mux.function = function;
index++;
}
}
*num_maps = count;
return 0;
}
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static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map,
unsigned num_maps)
{
kfree(map);
}
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static const struct pinctrl_ops spear_pinctrl_ops = {
.get_groups_count = spear_pinctrl_get_groups_cnt,
.get_group_name = spear_pinctrl_get_group_name,
.get_group_pins = spear_pinctrl_get_group_pins,
.pin_dbg_show = spear_pinctrl_pin_dbg_show,
.dt_node_to_map = spear_pinctrl_dt_node_to_map,
.dt_free_map = spear_pinctrl_dt_free_map,
};
static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->machdata->nfunctions;
}
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static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
unsigned function)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->machdata->functions[function]->name;
}
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static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
unsigned function, const char *const **groups,
unsigned * const ngroups)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
*groups = pmx->machdata->functions[function]->groups;
*ngroups = pmx->machdata->functions[function]->ngroups;
return 0;
}
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static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
unsigned function, unsigned group, bool enable)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
const struct spear_pingroup *pgroup;
const struct spear_modemux *modemux;
int i;
bool found = false;
pgroup = pmx->machdata->groups[group];
for (i = 0; i < pgroup->nmodemuxs; i++) {
modemux = &pgroup->modemuxs[i];
/* SoC have any modes */
if (pmx->machdata->modes_supported) {
if (!(pmx->machdata->mode & modemux->modes))
continue;
}
found = true;
muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs,
enable);
}
if (!found) {
dev_err(pmx->dev, "pinmux group: %s not supported\n",
pgroup->name);
return -ENODEV;
}
return 0;
}
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static int spear_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned function,
unsigned group)
{
return spear_pinctrl_endisable(pctldev, function, group, true);
}
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/* gpio with pinmux */
static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx,
unsigned pin)
{
struct spear_gpio_pingroup *gpio_pingroup;
int i, j;
if (!pmx->machdata->gpio_pingroups)
return NULL;
for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) {
gpio_pingroup = &pmx->machdata->gpio_pingroups[i];
for (j = 0; j < gpio_pingroup->npins; j++) {
if (gpio_pingroup->pins[j] == pin)
return gpio_pingroup;
}
}
return NULL;
}
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static int gpio_request_endisable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned offset, bool enable)
{
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
struct spear_pinctrl_machdata *machdata = pmx->machdata;
struct spear_gpio_pingroup *gpio_pingroup;
/*
* Some SoC have configuration options applicable to group of pins,
* rather than a single pin.
*/
gpio_pingroup = get_gpio_pingroup(pmx, offset);
if (gpio_pingroup)
muxregs_endisable(pmx, gpio_pingroup->muxregs,
gpio_pingroup->nmuxregs, enable);
/*
* SoC may need some extra configurations, or configurations for single
* pin
*/
if (machdata->gpio_request_endisable)
machdata->gpio_request_endisable(pmx, offset, enable);
return 0;
}
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static int gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned offset)
{
return gpio_request_endisable(pctldev, range, offset, true);
}
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static void gpio_disable_free(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range, unsigned offset)
{
gpio_request_endisable(pctldev, range, offset, false);
}
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| Total | 30 | 100.00% | 1 | 100.00% |
static const struct pinmux_ops spear_pinmux_ops = {
.get_functions_count = spear_pinctrl_get_funcs_count,
.get_function_name = spear_pinctrl_get_func_name,
.get_function_groups = spear_pinctrl_get_func_groups,
.set_mux = spear_pinctrl_set_mux,
.gpio_request_enable = gpio_request_enable,
.gpio_disable_free = gpio_disable_free,
};
static struct pinctrl_desc spear_pinctrl_desc = {
.name = DRIVER_NAME,
.pctlops = &spear_pinctrl_ops,
.pmxops = &spear_pinmux_ops,
.owner = THIS_MODULE,
};
int spear_pinctrl_probe(struct platform_device *pdev,
struct spear_pinctrl_machdata *machdata)
{
struct device_node *np = pdev->dev.of_node;
struct resource *res;
struct spear_pmx *pmx;
if (!machdata)
return -ENODEV;
pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
if (!pmx) {
dev_err(&pdev->dev, "Can't alloc spear_pmx\n");
return -ENOMEM;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pmx->vbase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pmx->vbase))
return PTR_ERR(pmx->vbase);
pmx->dev = &pdev->dev;
pmx->machdata = machdata;
/* configure mode, if supported by SoC */
if (machdata->modes_supported) {
int mode = 0;
if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
return -EINVAL;
}
if (set_mode(pmx, mode)) {
dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
mode);
return -EINVAL;
}
}
platform_set_drvdata(pdev, pmx);
spear_pinctrl_desc.pins = machdata->pins;
spear_pinctrl_desc.npins = machdata->npins;
pmx->pctl = devm_pinctrl_register(&pdev->dev, &spear_pinctrl_desc, pmx);
if (IS_ERR(pmx->pctl)) {
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
return PTR_ERR(pmx->pctl);
}
return 0;
}
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