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/*
* Copyright (C) 2015-2016 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <linux/io.h>
#include <linux/err.h>
#include <linux/sizes.h>
#include <dm/device.h>
#include <dm/pinctrl.h>
#include "pinctrl-uniphier.h"
#define UNIPHIER_PINCTRL_PINMUX_BASE 0x1000
#define UNIPHIER_PINCTRL_LOAD_PINMUX 0x1700
#define UNIPHIER_PINCTRL_IECTRL 0x1d00
static const char *uniphier_pinctrl_dummy_name = "_dummy";
static int uniphier_pinctrl_get_groups_count(struct udevice *dev)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
return priv->socdata->groups_count;
}
static const char *uniphier_pinctrl_get_group_name(struct udevice *dev,
unsigned selector)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
if (!priv->socdata->groups[selector].name)
return uniphier_pinctrl_dummy_name;
return priv->socdata->groups[selector].name;
}
static int uniphier_pinmux_get_functions_count(struct udevice *dev)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
return priv->socdata->functions_count;
}
static const char *uniphier_pinmux_get_function_name(struct udevice *dev,
unsigned selector)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
if (!priv->socdata->functions[selector])
return uniphier_pinctrl_dummy_name;
return priv->socdata->functions[selector];
}
static void uniphier_pinconf_input_enable_perpin(struct udevice *dev,
unsigned pin)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
unsigned reg;
u32 mask, tmp;
reg = UNIPHIER_PINCTRL_IECTRL + pin / 32 * 4;
mask = BIT(pin % 32);
tmp = readl(priv->base + reg);
tmp |= mask;
writel(tmp, priv->base + reg);
}
static void uniphier_pinconf_input_enable_legacy(struct udevice *dev,
unsigned pin)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
int pins_count = priv->socdata->pins_count;
const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
int i;
for (i = 0; i < pins_count; i++) {
if (pins[i].number == pin) {
unsigned int iectrl;
u32 tmp;
iectrl = uniphier_pin_get_iectrl(pins[i].data);
tmp = readl(priv->base + UNIPHIER_PINCTRL_IECTRL);
tmp |= 1 << iectrl;
writel(tmp, priv->base + UNIPHIER_PINCTRL_IECTRL);
}
}
}
static void uniphier_pinconf_input_enable(struct udevice *dev, unsigned pin)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
uniphier_pinconf_input_enable_perpin(dev, pin);
else
uniphier_pinconf_input_enable_legacy(dev, pin);
}
static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
int muxval)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
unsigned reg, reg_end, shift, mask;
unsigned mux_bits = 8;
unsigned reg_stride = 4;
bool load_pinctrl = false;
u32 tmp;
/* some pins need input-enabling */
uniphier_pinconf_input_enable(dev, pin);
if (muxval < 0)
return; /* dedicated pin; nothing to do for pin-mux */
if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_MUX_4BIT)
mux_bits = 4;
if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE) {
/*
* Mode offset bit
* Normal 4 * n shift+3:shift
* Debug 4 * n shift+7:shift+4
*/
mux_bits /= 2;
reg_stride = 8;
load_pinctrl = true;
}
reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride;
reg_end = reg + reg_stride;
shift = pin * mux_bits % 32;
mask = (1U << mux_bits) - 1;
/*
* If reg_stride is greater than 4, the MSB of each pinsel shall be
* stored in the offset+4.
*/
for (; reg < reg_end; reg += 4) {
tmp = readl(priv->base + reg);
tmp &= ~(mask << shift);
tmp |= (mask & muxval) << shift;
writel(tmp, priv->base + reg);
muxval >>= mux_bits;
}
if (load_pinctrl)
writel(1, priv->base + UNIPHIER_PINCTRL_LOAD_PINMUX);
}
static int uniphier_pinmux_group_set(struct udevice *dev,
unsigned group_selector,
unsigned func_selector)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
const struct uniphier_pinctrl_group *grp =
&priv->socdata->groups[group_selector];
int i;
for (i = 0; i < grp->num_pins; i++)
uniphier_pinmux_set_one(dev, grp->pins[i], grp->muxvals[i]);
return 0;
}
const struct pinctrl_ops uniphier_pinctrl_ops = {
.get_groups_count = uniphier_pinctrl_get_groups_count,
.get_group_name = uniphier_pinctrl_get_group_name,
.get_functions_count = uniphier_pinmux_get_functions_count,
.get_function_name = uniphier_pinmux_get_function_name,
.pinmux_group_set = uniphier_pinmux_group_set,
.set_state = pinctrl_generic_set_state,
};
int uniphier_pinctrl_probe(struct udevice *dev,
struct uniphier_pinctrl_socdata *socdata)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
addr = dev_get_addr(dev->parent);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->base = devm_ioremap(dev, addr, SZ_4K);
if (!priv->base)
return -ENOMEM;
priv->socdata = socdata;
return 0;
}
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