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// SPDX-License-Identifier: GPL-2.0+
//
// Exynos specific support for Samsung pinctrl/gpiolib driver with eint support.
//
// Copyright (c) 2012 Samsung Electronics Co., Ltd.
// http://www.samsung.com
// Copyright (c) 2012 Linaro Ltd
// http://www.linaro.org
//
// Author: Thomas Abraham <thomas.ab@samsung.com>
//
// This file contains the Samsung Exynos specific information required by the
// the Samsung pinctrl/gpiolib driver. It also includes the implementation of
// external gpio and wakeup interrupt support.
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/soc/samsung/exynos-pmu.h>
#include <dt-bindings/pinctrl/samsung.h>
#include "pinctrl-samsung.h"
#include "pinctrl-exynos.h"
struct exynos_irq_chip {
struct irq_chip chip;
u32 eint_con;
u32 eint_mask;
u32 eint_pend;
};
static inline struct exynos_irq_chip *to_exynos_irq_chip(struct irq_chip *chip)
{
return container_of(chip, struct exynos_irq_chip, chip);
}
static void exynos_irq_mask(struct irq_data *irqd)
{
struct irq_chip *chip = irq_data_get_irq_chip(irqd);
struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
unsigned long reg_mask = our_chip->eint_mask + bank->eint_offset;
unsigned long mask;
unsigned long flags;
spin_lock_irqsave(&bank->slock, flags);
mask = readl(bank->eint_base + reg_mask);
mask |= 1 << irqd->hwirq;
writel(mask, bank->eint_base + reg_mask);
spin_unlock_irqrestore(&bank->slock, flags);
}
static void exynos_irq_ack(struct irq_data *irqd)
{
struct irq_chip *chip = irq_data_get_irq_chip(irqd);
struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
unsigned long reg_pend = our_chip->eint_pend + bank->eint_offset;
writel(1 << irqd->hwirq, bank->eint_base + reg_pend);
}
static void exynos_irq_unmask(struct irq_data *irqd)
{
struct irq_chip *chip = irq_data_get_irq_chip(irqd);
struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
unsigned long reg_mask = our_chip->eint_mask + bank->eint_offset;
unsigned long mask;
unsigned long flags;
/*
* Ack level interrupts right before unmask
*
* If we don't do this we'll get a double-interrupt. Level triggered
* interrupts must not fire an interrupt if the level is not
* _currently_ active, even if it was active while the interrupt was
* masked.
*/
if (irqd_get_trigger_type(irqd) & IRQ_TYPE_LEVEL_MASK)
exynos_irq_ack(irqd);
spin_lock_irqsave(&bank->slock, flags);
mask = readl(bank->eint_base + reg_mask);
mask &= ~(1 << irqd->hwirq);
writel(mask, bank->eint_base + reg_mask);
spin_unlock_irqrestore(&bank->slock, flags);
}
static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type)
{
struct irq_chip *chip = irq_data_get_irq_chip(irqd);
struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
unsigned int shift = EXYNOS_EINT_CON_LEN * irqd->hwirq;
unsigned int con, trig_type;
unsigned long reg_con = our_chip->eint_con + bank->eint_offset;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
trig_type = EXYNOS_EINT_EDGE_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
trig_type = EXYNOS_EINT_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
trig_type = EXYNOS_EINT_EDGE_BOTH;
break;
case IRQ_TYPE_LEVEL_HIGH:
trig_type = EXYNOS_EINT_LEVEL_HIGH;
break;
case IRQ_TYPE_LEVEL_LOW:
trig_type = EXYNOS_EINT_LEVEL_LOW;
break;
default:
pr_err("unsupported external interrupt type\n");
return -EINVAL;
}
if (type & IRQ_TYPE_EDGE_BOTH)
irq_set_handler_locked(irqd, handle_edge_irq);
else
irq_set_handler_locked(irqd, handle_level_irq);
con = readl(bank->eint_base + reg_con);
con &= ~(EXYNOS_EINT_CON_MASK << shift);
con |= trig_type << shift;
writel(con, bank->eint_base + reg_con);
return 0;
}
static int exynos_irq_request_resources(struct irq_data *irqd)
{
struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
const struct samsung_pin_bank_type *bank_type = bank->type;
unsigned long reg_con, flags;
unsigned int shift, mask, con;
int ret;
ret = gpiochip_lock_as_irq(&bank->gpio_chip, irqd->hwirq);
if (ret) {
dev_err(bank->gpio_chip.parent,
"unable to lock pin %s-%lu IRQ\n",
bank->name, irqd->hwirq);
return ret;
}
reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC];
shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC];
mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
spin_lock_irqsave(&bank->slock, flags);
con = readl(bank->pctl_base + reg_con);
con &= ~(mask << shift);
con |= EXYNOS_PIN_FUNC_EINT << shift;
writel(con, bank->pctl_base + reg_con);
spin_unlock_irqrestore(&bank->slock, flags);
return 0;
}
static void exynos_irq_release_resources(struct irq_data *irqd)
{
struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
const struct samsung_pin_bank_type *bank_type = bank->type;
unsigned long reg_con, flags;
unsigned int shift, mask, con;
reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC];
shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC];
mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
spin_lock_irqsave(&bank->slock, flags);
con = readl(bank->pctl_base + reg_con);
con &= ~(mask << shift);
con |= EXYNOS_PIN_FUNC_INPUT << shift;
writel(con, bank->pctl_base + reg_con);
spin_unlock_irqrestore(&bank->slock, flags);
gpiochip_unlock_as_irq(&bank->gpio_chip, irqd->hwirq);
}
/*
* irq_chip for gpio interrupts.
*/
static struct exynos_irq_chip exynos_gpio_irq_chip = {
.chip = {
.name = "exynos_gpio_irq_chip",
.irq_unmask = exynos_irq_unmask,
.irq_mask = exynos_irq_mask,
.irq_ack = exynos_irq_ack,
.irq_set_type = exynos_irq_set_type,
.irq_request_resources = exynos_irq_request_resources,
.irq_release_resources = exynos_irq_release_resources,
},
.eint_con = EXYNOS_GPIO_ECON_OFFSET,
.eint_mask = EXYNOS_GPIO_EMASK_OFFSET,
.eint_pend = EXYNOS_GPIO_EPEND_OFFSET,
};
static int exynos_eint_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct samsung_pin_bank *b = h->host_data;
irq_set_chip_data(virq, b);
irq_set_chip_and_handler(virq, &b->irq_chip->chip,
handle_level_irq);
return 0;
}
/*
* irq domain callbacks for external gpio and wakeup interrupt controllers.
*/
static const struct irq_domain_ops exynos_eint_irqd_ops = {
.map = exynos_eint_irq_map,
.xlate = irq_domain_xlate_twocell,
};
static irqreturn_t exynos_eint_gpio_irq(int irq, void *data)
{
struct samsung_pinctrl_drv_data *d = data;
struct samsung_pin_bank *bank = d->pin_banks;
unsigned int svc, group, pin, virq;
svc = readl(bank->eint_base + EXYNOS_SVC_OFFSET);
group = EXYNOS_SVC_GROUP(svc);
pin = svc & EXYNOS_SVC_NUM_MASK;
if (!group)
return IRQ_HANDLED;
bank += (group - 1);
virq = irq_linear_revmap(bank->irq_domain, pin);
if (!virq)
return IRQ_NONE;
generic_handle_irq(virq);
return IRQ_HANDLED;
}
struct exynos_eint_gpio_save {
u32 eint_con;
u32 eint_fltcon0;
u32 eint_fltcon1;
};
/*
* exynos_eint_gpio_init() - setup handling of external gpio interrupts.
* @d: driver data of samsung pinctrl driver.
*/
int exynos_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
{
struct samsung_pin_bank *bank;
struct device *dev = d->dev;
int ret;
int i;
if (!d->irq) {
dev_err(dev, "irq number not available\n");
return -EINVAL;
}
ret = devm_request_irq(dev, d->irq, exynos_eint_gpio_irq,
0, dev_name(dev), d);
if (ret) {
dev_err(dev, "irq request failed\n");
return -ENXIO;
}
bank = d->pin_banks;
for (i = 0; i < d->nr_banks; ++i, ++bank) {
if (bank->eint_type != EINT_TYPE_GPIO)
continue;
bank->irq_domain = irq_domain_add_linear(bank->of_node,
bank->nr_pins, &exynos_eint_irqd_ops, bank);
if (!bank->irq_domain) {
dev_err(dev, "gpio irq domain add failed\n");
ret = -ENXIO;
goto err_domains;
}
bank->soc_priv = devm_kzalloc(d->dev,
sizeof(struct exynos_eint_gpio_save), GFP_KERNEL);
if (!bank->soc_priv) {
irq_domain_remove(bank->irq_domain);
ret = -ENOMEM;
goto err_domains;
}
bank->irq_chip = &exynos_gpio_irq_chip;
}
return 0;
err_domains:
for (--i, --bank; i >= 0; --i, --bank) {
if (bank->eint_type != EINT_TYPE_GPIO)
continue;
irq_domain_remove(bank->irq_domain);
}
return ret;
}
static u32 exynos_eint_wake_mask = 0xffffffff;
u32 exynos_get_eint_wake_mask(void)
{
return exynos_eint_wake_mask;
}
static int exynos_wkup_irq_set_wake(struct irq_data *irqd, unsigned int on)
{
struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
unsigned long bit = 1UL << (2 * bank->eint_offset + irqd->hwirq);
pr_info("wake %s for irq %d\n", on ? "enabled" : "disabled", irqd->irq);
if (!on)
exynos_eint_wake_mask |= bit;
else
exynos_eint_wake_mask &= ~bit;
return 0;
}
/*
* irq_chip for wakeup interrupts
*/
static const struct exynos_irq_chip exynos4210_wkup_irq_chip __initconst = {
.chip = {
.name = "exynos4210_wkup_irq_chip",
.irq_unmask = exynos_irq_unmask,
.irq_mask = exynos_irq_mask,
.irq_ack = exynos_irq_ack,
.irq_set_type = exynos_irq_set_type,
.irq_set_wake = exynos_wkup_irq_set_wake,
.irq_request_resources = exynos_irq_request_resources,
.irq_release_resources = exynos_irq_release_resources,
},
.eint_con = EXYNOS_WKUP_ECON_OFFSET,
.eint_mask = EXYNOS_WKUP_EMASK_OFFSET,
.eint_pend = EXYNOS_WKUP_EPEND_OFFSET,
};
static const struct exynos_irq_chip exynos7_wkup_irq_chip __initconst = {
.chip = {
.name = "exynos7_wkup_irq_chip",
.irq_unmask = exynos_irq_unmask,
.irq_mask = exynos_irq_mask,
.irq_ack = exynos_irq_ack,
.irq_set_type = exynos_irq_set_type,
.irq_set_wake = exynos_wkup_irq_set_wake,
.irq_request_resources = exynos_irq_request_resources,
.irq_release_resources = exynos_irq_release_resources,
},
.eint_con = EXYNOS7_WKUP_ECON_OFFSET,
.eint_mask = EXYNOS7_WKUP_EMASK_OFFSET,
.eint_pend = EXYNOS7_WKUP_EPEND_OFFSET,
};
/* list of external wakeup controllers supported */
static const struct of_device_id exynos_wkup_irq_ids[] = {
{ .compatible = "samsung,exynos4210-wakeup-eint",
.data = &exynos4210_wkup_irq_chip },
{ .compatible = "samsung,exynos7-wakeup-eint",
.data = &exynos7_wkup_irq_chip },
{ }
};
/* interrupt handler for wakeup interrupts 0..15 */
static void exynos_irq_eint0_15(struct irq_desc *desc)
{
struct exynos_weint_data *eintd = irq_desc_get_handler_data(desc);
struct samsung_pin_bank *bank = eintd->bank;
struct irq_chip *chip = irq_desc_get_chip(desc);
int eint_irq;
chained_irq_enter(chip, desc);
eint_irq = irq_linear_revmap(bank->irq_domain, eintd->irq);
generic_handle_irq(eint_irq);
chained_irq_exit(chip, desc);
}
static inline void exynos_irq_demux_eint(unsigned long pend,
struct irq_domain *domain)
{
unsigned int irq;
while (pend) {
irq = fls(pend) - 1;
generic_handle_irq(irq_find_mapping(domain, irq));
pend &= ~(1 << irq);
}
}
/* interrupt handler for wakeup interrupt 16 */
static void exynos_irq_demux_eint16_31(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct exynos_muxed_weint_data *eintd = irq_desc_get_handler_data(desc);
unsigned long pend;
unsigned long mask;
int i;
chained_irq_enter(chip, desc);
for (i = 0; i < eintd->nr_banks; ++i) {
struct samsung_pin_bank *b = eintd->banks[i];
pend = readl(b->eint_base + b->irq_chip->eint_pend
+ b->eint_offset);
mask = readl(b->eint_base + b->irq_chip->eint_mask
+ b->eint_offset);
exynos_irq_demux_eint(pend & ~mask, b->irq_domain);
}
chained_irq_exit(chip, desc);
}
/*
* exynos_eint_wkup_init() - setup handling of external wakeup interrupts.
* @d: driver data of samsung pinctrl driver.
*/
int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
{
struct device *dev = d->dev;
struct device_node *wkup_np = NULL;
struct device_node *np;
struct samsung_pin_bank *bank;
struct exynos_weint_data *weint_data;
struct exynos_muxed_weint_data *muxed_data;
struct exynos_irq_chip *irq_chip;
unsigned int muxed_banks = 0;
unsigned int i;
int idx, irq;
for_each_child_of_node(dev->of_node, np) {
const struct of_device_id *match;
match = of_match_node(exynos_wkup_irq_ids, np);
if (match) {
irq_chip = kmemdup(match->data,
sizeof(*irq_chip), GFP_KERNEL);
if (!irq_chip)
return -ENOMEM;
wkup_np = np;
break;
}
}
if (!wkup_np)
return -ENODEV;
bank = d->pin_banks;
for (i = 0; i < d->nr_banks; ++i, ++bank) {
if (bank->eint_type != EINT_TYPE_WKUP)
continue;
bank->irq_domain = irq_domain_add_linear(bank->of_node,
bank->nr_pins, &exynos_eint_irqd_ops, bank);
if (!bank->irq_domain) {
dev_err(dev, "wkup irq domain add failed\n");
return -ENXIO;
}
bank->irq_chip = irq_chip;
if (!of_find_property(bank->of_node, "interrupts", NULL)) {
bank->eint_type = EINT_TYPE_WKUP_MUX;
++muxed_banks;
continue;
}
weint_data = devm_kcalloc(dev,
bank->nr_pins, sizeof(*weint_data),
GFP_KERNEL);
if (!weint_data)
return -ENOMEM;
for (idx = 0; idx < bank->nr_pins; ++idx) {
irq = irq_of_parse_and_map(bank->of_node, idx);
if (!irq) {
dev_err(dev, "irq number for eint-%s-%d not found\n",
bank->name, idx);
continue;
}
weint_data[idx].irq = idx;
weint_data[idx].bank = bank;
irq_set_chained_handler_and_data(irq,
exynos_irq_eint0_15,
&weint_data[idx]);
}
}
if (!muxed_banks)
return 0;
irq = irq_of_parse_and_map(wkup_np, 0);
if (!irq) {
dev_err(dev, "irq number for muxed EINTs not found\n");
return 0;
}
muxed_data = devm_kzalloc(dev, sizeof(*muxed_data)
+ muxed_banks*sizeof(struct samsung_pin_bank *), GFP_KERNEL);
if (!muxed_data)
return -ENOMEM;
irq_set_chained_handler_and_data(irq, exynos_irq_demux_eint16_31,
muxed_data);
bank = d->pin_banks;
idx = 0;
for (i = 0; i < d->nr_banks; ++i, ++bank) {
if (bank->eint_type != EINT_TYPE_WKUP_MUX)
continue;
muxed_data->banks[idx++] = bank;
}
muxed_data->nr_banks = muxed_banks;
return 0;
}
static void exynos_pinctrl_suspend_bank(
struct samsung_pinctrl_drv_data *drvdata,
struct samsung_pin_bank *bank)
{
struct exynos_eint_gpio_save *save = bank->soc_priv;
void __iomem *regs = bank->eint_base;
save->eint_con = readl(regs + EXYNOS_GPIO_ECON_OFFSET
+ bank->eint_offset);
save->eint_fltcon0 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
+ 2 * bank->eint_offset);
save->eint_fltcon1 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
+ 2 * bank->eint_offset + 4);
pr_debug("%s: save con %#010x\n", bank->name, save->eint_con);
pr_debug("%s: save fltcon0 %#010x\n", bank->name, save->eint_fltcon0);
pr_debug("%s: save fltcon1 %#010x\n", bank->name, save->eint_fltcon1);
}
void exynos_pinctrl_suspend(struct samsung_pinctrl_drv_data *drvdata)
{
struct samsung_pin_bank *bank = drvdata->pin_banks;
int i;
for (i = 0; i < drvdata->nr_banks; ++i, ++bank)
if (bank->eint_type == EINT_TYPE_GPIO)
exynos_pinctrl_suspend_bank(drvdata, bank);
}
static void exynos_pinctrl_resume_bank(
struct samsung_pinctrl_drv_data *drvdata,
struct samsung_pin_bank *bank)
{
struct exynos_eint_gpio_save *save = bank->soc_priv;
void __iomem *regs = bank->eint_base;
pr_debug("%s: con %#010x => %#010x\n", bank->name,
readl(regs + EXYNOS_GPIO_ECON_OFFSET
+ bank->eint_offset), save->eint_con);
pr_debug("%s: fltcon0 %#010x => %#010x\n", bank->name,
readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
+ 2 * bank->eint_offset), save->eint_fltcon0);
pr_debug("%s: fltcon1 %#010x => %#010x\n", bank->name,
readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
+ 2 * bank->eint_offset + 4), save->eint_fltcon1);
writel(save->eint_con, regs + EXYNOS_GPIO_ECON_OFFSET
+ bank->eint_offset);
writel(save->eint_fltcon0, regs + EXYNOS_GPIO_EFLTCON_OFFSET
+ 2 * bank->eint_offset);
writel(save->eint_fltcon1, regs + EXYNOS_GPIO_EFLTCON_OFFSET
+ 2 * bank->eint_offset + 4);
}
void exynos_pinctrl_resume(struct samsung_pinctrl_drv_data *drvdata)
{
struct samsung_pin_bank *bank = drvdata->pin_banks;
int i;
for (i = 0; i < drvdata->nr_banks; ++i, ++bank)
if (bank->eint_type == EINT_TYPE_GPIO)
exynos_pinctrl_resume_bank(drvdata, bank);
}
static void exynos_retention_enable(struct samsung_pinctrl_drv_data *drvdata)
{
if (drvdata->retention_ctrl->refcnt)
atomic_inc(drvdata->retention_ctrl->refcnt);
}
static void exynos_retention_disable(struct samsung_pinctrl_drv_data *drvdata)
{
struct samsung_retention_ctrl *ctrl = drvdata->retention_ctrl;
struct regmap *pmu_regs = ctrl->priv;
int i;
if (ctrl->refcnt && !atomic_dec_and_test(ctrl->refcnt))
return;
for (i = 0; i < ctrl->nr_regs; i++)
regmap_write(pmu_regs, ctrl->regs[i], ctrl->value);
}
struct samsung_retention_ctrl *
exynos_retention_init(struct samsung_pinctrl_drv_data *drvdata,
const struct samsung_retention_data *data)
{
struct samsung_retention_ctrl *ctrl;
struct regmap *pmu_regs;
int i;
ctrl = devm_kzalloc(drvdata->dev, sizeof(*ctrl), GFP_KERNEL);
if (!ctrl)
return ERR_PTR(-ENOMEM);
pmu_regs = exynos_get_pmu_regmap();
if (IS_ERR(pmu_regs))
return ERR_CAST(pmu_regs);
ctrl->priv = pmu_regs;
ctrl->regs = data->regs;
ctrl->nr_regs = data->nr_regs;
ctrl->value = data->value;
ctrl->refcnt = data->refcnt;
ctrl->enable = exynos_retention_enable;
ctrl->disable = exynos_retention_disable;
/* Ensure that retention is disabled on driver init */
for (i = 0; i < ctrl->nr_regs; i++)
regmap_write(pmu_regs, ctrl->regs[i], ctrl->value);
return ctrl;
}