355 lines
8.4 KiB
C
355 lines
8.4 KiB
C
/*
|
|
* Driver for the ST Microelectronics SPEAr pinmux
|
|
*
|
|
* Copyright (C) 2012 ST Microelectronics
|
|
* Viresh Kumar <viresh.linux@gmail.com>
|
|
*
|
|
* 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/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.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 inline u32 pmx_readl(struct spear_pmx *pmx, u32 reg)
|
|
{
|
|
return readl_relaxed(pmx->vbase + reg);
|
|
}
|
|
|
|
static inline void pmx_writel(struct spear_pmx *pmx, u32 val, u32 reg)
|
|
{
|
|
writel_relaxed(val, pmx->vbase + reg);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void __devinit 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;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
|
|
{
|
|
struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
|
|
|
|
return pmx->machdata->ngroups;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
|
|
struct seq_file *s, unsigned offset)
|
|
{
|
|
seq_printf(s, " " DRIVER_NAME);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
|
|
struct pinctrl_map *map, unsigned num_maps)
|
|
{
|
|
kfree(map);
|
|
}
|
|
|
|
static 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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
struct spear_muxreg *muxreg;
|
|
u32 val, temp;
|
|
int i, j;
|
|
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;
|
|
for (j = 0; j < modemux->nmuxregs; j++) {
|
|
muxreg = &modemux->muxregs[j];
|
|
|
|
val = pmx_readl(pmx, muxreg->reg);
|
|
val &= ~muxreg->mask;
|
|
|
|
if (enable)
|
|
temp = muxreg->val;
|
|
else
|
|
temp = ~muxreg->val;
|
|
|
|
val |= temp;
|
|
pmx_writel(pmx, val, muxreg->reg);
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
dev_err(pmx->dev, "pinmux group: %s not supported\n",
|
|
pgroup->name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
|
|
unsigned group)
|
|
{
|
|
return spear_pinctrl_endisable(pctldev, function, group, true);
|
|
}
|
|
|
|
static void spear_pinctrl_disable(struct pinctrl_dev *pctldev,
|
|
unsigned function, unsigned group)
|
|
{
|
|
spear_pinctrl_endisable(pctldev, function, group, false);
|
|
}
|
|
|
|
static 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,
|
|
.enable = spear_pinctrl_enable,
|
|
.disable = spear_pinctrl_disable,
|
|
};
|
|
|
|
static struct pinctrl_desc spear_pinctrl_desc = {
|
|
.name = DRIVER_NAME,
|
|
.pctlops = &spear_pinctrl_ops,
|
|
.pmxops = &spear_pinmux_ops,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
int __devinit 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;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -EINVAL;
|
|
|
|
pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
|
|
if (!pmx) {
|
|
dev_err(&pdev->dev, "Can't alloc spear_pmx\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pmx->vbase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
|
|
if (!pmx->vbase) {
|
|
dev_err(&pdev->dev, "Couldn't ioremap at index 0\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
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 = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx);
|
|
if (IS_ERR(pmx->pctl)) {
|
|
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
|
|
return PTR_ERR(pmx->pctl);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __devexit spear_pinctrl_remove(struct platform_device *pdev)
|
|
{
|
|
struct spear_pmx *pmx = platform_get_drvdata(pdev);
|
|
|
|
pinctrl_unregister(pmx->pctl);
|
|
|
|
return 0;
|
|
}
|