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/*
* (C) Copyright 2016 - Beniamino Galvani <b.galvani@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm/device.h>
#include <dm/pinctrl.h>
#include <fdt_support.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/sizes.h>
#include "pinctrl-meson.h"
DECLARE_GLOBAL_DATA_PTR;
static const char *meson_pinctrl_dummy_name = "_dummy";
static int meson_pinctrl_get_groups_count(struct udevice *dev)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
return priv->data->num_groups;
}
static const char *meson_pinctrl_get_group_name(struct udevice *dev,
unsigned selector)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
if (!priv->data->groups[selector].name)
return meson_pinctrl_dummy_name;
return priv->data->groups[selector].name;
}
static int meson_pinmux_get_functions_count(struct udevice *dev)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
return priv->data->num_funcs;
}
static const char *meson_pinmux_get_function_name(struct udevice *dev,
unsigned selector)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
return priv->data->funcs[selector].name;
}
static void meson_pinmux_disable_other_groups(struct meson_pinctrl *priv,
unsigned int pin, int sel_group)
{
struct meson_pmx_group *group;
void __iomem *addr;
int i, j;
for (i = 0; i < priv->data->num_groups; i++) {
group = &priv->data->groups[i];
if (group->is_gpio || i == sel_group)
continue;
for (j = 0; j < group->num_pins; j++) {
if (group->pins[j] == pin) {
/* We have found a group using the pin */
debug("pinmux: disabling %s\n", group->name);
addr = priv->reg_mux + group->reg * 4;
writel(readl(addr) & ~BIT(group->bit), addr);
}
}
}
}
static int meson_pinmux_group_set(struct udevice *dev,
unsigned group_selector,
unsigned func_selector)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
const struct meson_pmx_group *group;
const struct meson_pmx_func *func;
void __iomem *addr;
int i;
group = &priv->data->groups[group_selector];
func = &priv->data->funcs[func_selector];
debug("pinmux: set group %s func %s\n", group->name, func->name);
/*
* Disable groups using the same pins.
* The selected group is not disabled to avoid glitches.
*/
for (i = 0; i < group->num_pins; i++) {
meson_pinmux_disable_other_groups(priv,
group->pins[i],
group_selector);
}
/* Function 0 (GPIO) doesn't need any additional setting */
if (func_selector) {
addr = priv->reg_mux + group->reg * 4;
writel(readl(addr) | BIT(group->bit), addr);
}
return 0;
}
const struct pinctrl_ops meson_pinctrl_ops = {
.get_groups_count = meson_pinctrl_get_groups_count,
.get_group_name = meson_pinctrl_get_group_name,
.get_functions_count = meson_pinmux_get_functions_count,
.get_function_name = meson_pinmux_get_function_name,
.pinmux_group_set = meson_pinmux_group_set,
.set_state = pinctrl_generic_set_state,
};
static fdt_addr_t parse_address(int offset, const char *name, int na, int ns)
{
int index, len = 0;
const fdt32_t *reg;
index = fdt_stringlist_search(gd->fdt_blob, offset, "reg-names", name);
if (index < 0)
return FDT_ADDR_T_NONE;
reg = fdt_getprop(gd->fdt_blob, offset, "reg", &len);
if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns))))
return FDT_ADDR_T_NONE;
reg += index * (na + ns);
return fdt_translate_address((void *)gd->fdt_blob, offset, reg);
}
int meson_pinctrl_probe(struct udevice *dev)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
fdt_addr_t addr;
int node, gpio = -1, len;
int na, ns;
na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset);
if (na < 1) {
debug("bad #address-cells\n");
return -EINVAL;
}
ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset);
if (ns < 1) {
debug("bad #size-cells\n");
return -EINVAL;
}
fdt_for_each_subnode(node, gd->fdt_blob, dev->of_offset) {
if (fdt_getprop(gd->fdt_blob, node, "gpio-controller", &len)) {
gpio = node;
break;
}
}
if (!gpio) {
debug("gpio node not found\n");
return -EINVAL;
}
addr = parse_address(gpio, "mux", na, ns);
if (addr == FDT_ADDR_T_NONE) {
debug("mux not found\n");
return -EINVAL;
}
priv->reg_mux = (void __iomem *)addr;
priv->data = (struct meson_pinctrl_data *)dev_get_driver_data(dev);
return 0;
}
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