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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015-2016 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*/
#include <common.h>
#include <dm.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/sizes.h>
#include <dm/pinctrl.h>
#include "pinctrl-uniphier.h"
#define UNIPHIER_PINCTRL_PINMUX_BASE 0x1000
#define UNIPHIER_PINCTRL_LOAD_PINMUX 0x1700
#define UNIPHIER_PINCTRL_DRVCTRL_BASE 0x1800
#define UNIPHIER_PINCTRL_DRV2CTRL_BASE 0x1900
#define UNIPHIER_PINCTRL_DRV3CTRL_BASE 0x1980
#define UNIPHIER_PINCTRL_PUPDCTRL_BASE 0x1a00
#define UNIPHIER_PINCTRL_IECTRL 0x1d00
static const char *uniphier_pinctrl_dummy_name = "_dummy";
static int uniphier_pinctrl_get_pins_count(struct udevice *dev)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
int pins_count = priv->socdata->pins_count;
/*
* We do not list all pins in the pin table to save memory footprint.
* Report the max pin number + 1 to fake the framework.
*/
return pins[pins_count - 1].number + 1;
}
static const char *uniphier_pinctrl_get_pin_name(struct udevice *dev,
unsigned int selector)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
int pins_count = priv->socdata->pins_count;
int i;
for (i = 0; i < pins_count; i++)
if (pins[i].number == selector)
return pins[i].name;
return uniphier_pinctrl_dummy_name;
}
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 int uniphier_pinconf_input_enable_perpin(struct udevice *dev,
unsigned int pin, int enable)
{
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);
if (enable)
tmp |= mask;
else
tmp &= ~mask;
writel(tmp, priv->base + reg);
return 0;
}
static int uniphier_pinconf_input_enable_legacy(struct udevice *dev,
unsigned int pin, int enable)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
/*
* Multiple pins share one input enable, per-pin disabling is
* impossible.
*/
if (!enable)
return -EINVAL;
/* Set all bits instead of having a bunch of pin data */
writel(U32_MAX, priv->base + UNIPHIER_PINCTRL_IECTRL);
return 0;
}
static int uniphier_pinconf_input_enable(struct udevice *dev,
unsigned int pin, int enable)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
return uniphier_pinconf_input_enable_perpin(dev, pin, enable);
else
return uniphier_pinconf_input_enable_legacy(dev, pin, enable);
}
#if CONFIG_IS_ENABLED(PINCONF)
static const struct pinconf_param uniphier_pinconf_params[] = {
{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
};
static const struct uniphier_pinctrl_pin *
uniphier_pinctrl_pin_get(struct uniphier_pinctrl_priv *priv, unsigned int pin)
{
const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
int pins_count = priv->socdata->pins_count;
int i;
for (i = 0; i < pins_count; i++)
if (pins[i].number == pin)
return &pins[i];
return NULL;
}
static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin,
unsigned int param, unsigned int arg)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
unsigned int enable = 1;
unsigned int reg;
u32 mask, tmp;
if (!(priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE))
return -ENOTSUPP;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
enable = 0;
break;
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
if (arg == 0) /* total bias is not supported */
return -EINVAL;
break;
case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
if (arg == 0) /* configuration ignored */
return 0;
default:
BUG();
}
reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pin / 32 * 4;
mask = BIT(pin % 32);
tmp = readl(priv->base + reg);
if (enable)
tmp |= mask;
else
tmp &= ~mask;
writel(tmp, priv->base + reg);
return 0;
}
static const unsigned int uniphier_pinconf_drv_strengths_1bit[] = {
4, 8,
};
static const unsigned int uniphier_pinconf_drv_strengths_2bit[] = {
8, 12, 16, 20,
};
static const unsigned int uniphier_pinconf_drv_strengths_3bit[] = {
4, 5, 7, 9, 11, 12, 14, 16,
};
static int uniphier_pinconf_drive_set(struct udevice *dev, unsigned int pin,
unsigned int strength)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
const struct uniphier_pinctrl_pin *desc;
const unsigned int *strengths;
unsigned int base, stride, width, drvctrl, reg, shift;
u32 val, mask, tmp;
desc = uniphier_pinctrl_pin_get(priv, pin);
if (WARN_ON(!desc))
return -EINVAL;
switch (uniphier_pin_get_drv_type(desc->data)) {
case UNIPHIER_PIN_DRV_1BIT:
strengths = uniphier_pinconf_drv_strengths_1bit;
base = UNIPHIER_PINCTRL_DRVCTRL_BASE;
stride = 1;
width = 1;
break;
case UNIPHIER_PIN_DRV_2BIT:
strengths = uniphier_pinconf_drv_strengths_2bit;
base = UNIPHIER_PINCTRL_DRV2CTRL_BASE;
stride = 2;
width = 2;
break;
case UNIPHIER_PIN_DRV_3BIT:
strengths = uniphier_pinconf_drv_strengths_3bit;
base = UNIPHIER_PINCTRL_DRV3CTRL_BASE;
stride = 4;
width = 3;
break;
default:
/* drive strength control is not supported for this pin */
return -EINVAL;
}
drvctrl = uniphier_pin_get_drvctrl(desc->data);
drvctrl *= stride;
reg = base + drvctrl / 32 * 4;
shift = drvctrl % 32;
mask = (1U << width) - 1;
for (val = 0; val <= mask; val++) {
if (strengths[val] > strength)
break;
}
if (val == 0) {
dev_err(dev, "unsupported drive strength %u mA for pin %s\n",
strength, desc->name);
return -EINVAL;
}
if (!mask)
return 0;
val--;
tmp = readl(priv->base + reg);
tmp &= ~(mask << shift);
tmp |= (mask & val) << shift;
writel(tmp, priv->base + reg);
return 0;
}
static int uniphier_pinconf_set(struct udevice *dev, unsigned int pin,
unsigned int param, unsigned int arg)
{
int ret;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
ret = uniphier_pinconf_bias_set(dev, pin, param, arg);
break;
case PIN_CONFIG_DRIVE_STRENGTH:
ret = uniphier_pinconf_drive_set(dev, pin, arg);
break;
case PIN_CONFIG_INPUT_ENABLE:
ret = uniphier_pinconf_input_enable(dev, pin, arg);
break;
default:
dev_err(dev, "unsupported configuration parameter %u\n", param);
return -EINVAL;
}
return ret;
}
static int uniphier_pinconf_group_set(struct udevice *dev,
unsigned int group_selector,
unsigned int param, unsigned int arg)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
const struct uniphier_pinctrl_group *grp =
&priv->socdata->groups[group_selector];
int i, ret;
for (i = 0; i < grp->num_pins; i++) {
ret = uniphier_pinconf_set(dev, grp->pins[i], param, arg);
if (ret)
return ret;
}
return 0;
}
#endif /* CONFIG_IS_ENABLED(PINCONF) */
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, 1);
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_pins_count = uniphier_pinctrl_get_pins_count,
.get_pin_name = uniphier_pinctrl_get_pin_name,
.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,
#if CONFIG_IS_ENABLED(PINCONF)
.pinconf_num_params = ARRAY_SIZE(uniphier_pinconf_params),
.pinconf_params = uniphier_pinconf_params,
.pinconf_set = uniphier_pinconf_set,
.pinconf_group_set = uniphier_pinconf_group_set,
#endif
.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 = devfdt_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;
}