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linux/drivers/pinctrl/intel/pinctrl-intel.c
Mika Westerberg f5a26acf01 pinctrl: intel: Initialize GPIO properly when used through irqchip
When a GPIO is requested using gpiod_get_* APIs the intel pinctrl driver
switches the pin to GPIO mode and makes sure interrupts are routed to
the GPIO hardware instead of IOAPIC. However, if the GPIO is used
directly through irqchip, as is the case with many I2C-HID devices where
I2C core automatically configures interrupt for the device, the pin is
not initialized as GPIO. Instead we rely that the BIOS configures the
pin accordingly which seems not to be the case at least in Asus X540NA
SKU3 with Focaltech touchpad.

When the pin is not properly configured it might result weird behaviour
like interrupts suddenly stop firing completely and the touchpad stops
responding to user input.

Fix this by properly initializing the pin to GPIO mode also when it is
used directly through irqchip.

Fixes: 7981c0015a ("pinctrl: intel: Add Intel Sunrisepoint pin controller and GPIO support")
Reported-by: Daniel Drake <drake@endlessm.com>
Reported-and-tested-by: Chris Chiu <chiu@endlessm.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-02 13:11:04 +01:00

1523 lines
38 KiB
C

/*
* Intel pinctrl/GPIO core driver.
*
* Copyright (C) 2015, Intel Corporation
* Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
* Mika Westerberg <mika.westerberg@linux.intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/gpio/driver.h>
#include <linux/log2.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include "../core.h"
#include "pinctrl-intel.h"
/* Offset from regs */
#define REVID 0x000
#define REVID_SHIFT 16
#define REVID_MASK GENMASK(31, 16)
#define PADBAR 0x00c
#define GPI_IS 0x100
#define PADOWN_BITS 4
#define PADOWN_SHIFT(p) ((p) % 8 * PADOWN_BITS)
#define PADOWN_MASK(p) (0xf << PADOWN_SHIFT(p))
#define PADOWN_GPP(p) ((p) / 8)
/* Offset from pad_regs */
#define PADCFG0 0x000
#define PADCFG0_RXEVCFG_SHIFT 25
#define PADCFG0_RXEVCFG_MASK (3 << PADCFG0_RXEVCFG_SHIFT)
#define PADCFG0_RXEVCFG_LEVEL 0
#define PADCFG0_RXEVCFG_EDGE 1
#define PADCFG0_RXEVCFG_DISABLED 2
#define PADCFG0_RXEVCFG_EDGE_BOTH 3
#define PADCFG0_PREGFRXSEL BIT(24)
#define PADCFG0_RXINV BIT(23)
#define PADCFG0_GPIROUTIOXAPIC BIT(20)
#define PADCFG0_GPIROUTSCI BIT(19)
#define PADCFG0_GPIROUTSMI BIT(18)
#define PADCFG0_GPIROUTNMI BIT(17)
#define PADCFG0_PMODE_SHIFT 10
#define PADCFG0_PMODE_MASK (0xf << PADCFG0_PMODE_SHIFT)
#define PADCFG0_GPIORXDIS BIT(9)
#define PADCFG0_GPIOTXDIS BIT(8)
#define PADCFG0_GPIORXSTATE BIT(1)
#define PADCFG0_GPIOTXSTATE BIT(0)
#define PADCFG1 0x004
#define PADCFG1_TERM_UP BIT(13)
#define PADCFG1_TERM_SHIFT 10
#define PADCFG1_TERM_MASK (7 << PADCFG1_TERM_SHIFT)
#define PADCFG1_TERM_20K 4
#define PADCFG1_TERM_2K 3
#define PADCFG1_TERM_5K 2
#define PADCFG1_TERM_1K 1
#define PADCFG2 0x008
#define PADCFG2_DEBEN BIT(0)
#define PADCFG2_DEBOUNCE_SHIFT 1
#define PADCFG2_DEBOUNCE_MASK GENMASK(4, 1)
#define DEBOUNCE_PERIOD 31250 /* ns */
struct intel_pad_context {
u32 padcfg0;
u32 padcfg1;
u32 padcfg2;
};
struct intel_community_context {
u32 *intmask;
};
struct intel_pinctrl_context {
struct intel_pad_context *pads;
struct intel_community_context *communities;
};
/**
* struct intel_pinctrl - Intel pinctrl private structure
* @dev: Pointer to the device structure
* @lock: Lock to serialize register access
* @pctldesc: Pin controller description
* @pctldev: Pointer to the pin controller device
* @chip: GPIO chip in this pin controller
* @soc: SoC/PCH specific pin configuration data
* @communities: All communities in this pin controller
* @ncommunities: Number of communities in this pin controller
* @context: Configuration saved over system sleep
* @irq: pinctrl/GPIO chip irq number
*/
struct intel_pinctrl {
struct device *dev;
raw_spinlock_t lock;
struct pinctrl_desc pctldesc;
struct pinctrl_dev *pctldev;
struct gpio_chip chip;
const struct intel_pinctrl_soc_data *soc;
struct intel_community *communities;
size_t ncommunities;
struct intel_pinctrl_context context;
int irq;
};
#define pin_to_padno(c, p) ((p) - (c)->pin_base)
#define padgroup_offset(g, p) ((p) - (g)->base)
static struct intel_community *intel_get_community(struct intel_pinctrl *pctrl,
unsigned pin)
{
struct intel_community *community;
int i;
for (i = 0; i < pctrl->ncommunities; i++) {
community = &pctrl->communities[i];
if (pin >= community->pin_base &&
pin < community->pin_base + community->npins)
return community;
}
dev_warn(pctrl->dev, "failed to find community for pin %u\n", pin);
return NULL;
}
static const struct intel_padgroup *
intel_community_get_padgroup(const struct intel_community *community,
unsigned pin)
{
int i;
for (i = 0; i < community->ngpps; i++) {
const struct intel_padgroup *padgrp = &community->gpps[i];
if (pin >= padgrp->base && pin < padgrp->base + padgrp->size)
return padgrp;
}
return NULL;
}
static void __iomem *intel_get_padcfg(struct intel_pinctrl *pctrl, unsigned pin,
unsigned reg)
{
const struct intel_community *community;
unsigned padno;
size_t nregs;
community = intel_get_community(pctrl, pin);
if (!community)
return NULL;
padno = pin_to_padno(community, pin);
nregs = (community->features & PINCTRL_FEATURE_DEBOUNCE) ? 4 : 2;
if (reg == PADCFG2 && !(community->features & PINCTRL_FEATURE_DEBOUNCE))
return NULL;
return community->pad_regs + reg + padno * nregs * 4;
}
static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned pin)
{
const struct intel_community *community;
const struct intel_padgroup *padgrp;
unsigned gpp, offset, gpp_offset;
void __iomem *padown;
community = intel_get_community(pctrl, pin);
if (!community)
return false;
if (!community->padown_offset)
return true;
padgrp = intel_community_get_padgroup(community, pin);
if (!padgrp)
return false;
gpp_offset = padgroup_offset(padgrp, pin);
gpp = PADOWN_GPP(gpp_offset);
offset = community->padown_offset + padgrp->padown_num * 4 + gpp * 4;
padown = community->regs + offset;
return !(readl(padown) & PADOWN_MASK(gpp_offset));
}
static bool intel_pad_acpi_mode(struct intel_pinctrl *pctrl, unsigned pin)
{
const struct intel_community *community;
const struct intel_padgroup *padgrp;
unsigned offset, gpp_offset;
void __iomem *hostown;
community = intel_get_community(pctrl, pin);
if (!community)
return true;
if (!community->hostown_offset)
return false;
padgrp = intel_community_get_padgroup(community, pin);
if (!padgrp)
return true;
gpp_offset = padgroup_offset(padgrp, pin);
offset = community->hostown_offset + padgrp->reg_num * 4;
hostown = community->regs + offset;
return !(readl(hostown) & BIT(gpp_offset));
}
static bool intel_pad_locked(struct intel_pinctrl *pctrl, unsigned pin)
{
struct intel_community *community;
const struct intel_padgroup *padgrp;
unsigned offset, gpp_offset;
u32 value;
community = intel_get_community(pctrl, pin);
if (!community)
return true;
if (!community->padcfglock_offset)
return false;
padgrp = intel_community_get_padgroup(community, pin);
if (!padgrp)
return true;
gpp_offset = padgroup_offset(padgrp, pin);
/*
* If PADCFGLOCK and PADCFGLOCKTX bits are both clear for this pad,
* the pad is considered unlocked. Any other case means that it is
* either fully or partially locked and we don't touch it.
*/
offset = community->padcfglock_offset + padgrp->reg_num * 8;
value = readl(community->regs + offset);
if (value & BIT(gpp_offset))
return true;
offset = community->padcfglock_offset + 4 + padgrp->reg_num * 8;
value = readl(community->regs + offset);
if (value & BIT(gpp_offset))
return true;
return false;
}
static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned pin)
{
return intel_pad_owned_by_host(pctrl, pin) &&
!intel_pad_locked(pctrl, pin);
}
static int intel_get_groups_count(struct pinctrl_dev *pctldev)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
return pctrl->soc->ngroups;
}
static const char *intel_get_group_name(struct pinctrl_dev *pctldev,
unsigned group)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
return pctrl->soc->groups[group].name;
}
static int intel_get_group_pins(struct pinctrl_dev *pctldev, unsigned group,
const unsigned **pins, unsigned *npins)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
*pins = pctrl->soc->groups[group].pins;
*npins = pctrl->soc->groups[group].npins;
return 0;
}
static void intel_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
unsigned pin)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
void __iomem *padcfg;
u32 cfg0, cfg1, mode;
bool locked, acpi;
if (!intel_pad_owned_by_host(pctrl, pin)) {
seq_puts(s, "not available");
return;
}
cfg0 = readl(intel_get_padcfg(pctrl, pin, PADCFG0));
cfg1 = readl(intel_get_padcfg(pctrl, pin, PADCFG1));
mode = (cfg0 & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT;
if (!mode)
seq_puts(s, "GPIO ");
else
seq_printf(s, "mode %d ", mode);
seq_printf(s, "0x%08x 0x%08x", cfg0, cfg1);
/* Dump the additional PADCFG registers if available */
padcfg = intel_get_padcfg(pctrl, pin, PADCFG2);
if (padcfg)
seq_printf(s, " 0x%08x", readl(padcfg));
locked = intel_pad_locked(pctrl, pin);
acpi = intel_pad_acpi_mode(pctrl, pin);
if (locked || acpi) {
seq_puts(s, " [");
if (locked) {
seq_puts(s, "LOCKED");
if (acpi)
seq_puts(s, ", ");
}
if (acpi)
seq_puts(s, "ACPI");
seq_puts(s, "]");
}
}
static const struct pinctrl_ops intel_pinctrl_ops = {
.get_groups_count = intel_get_groups_count,
.get_group_name = intel_get_group_name,
.get_group_pins = intel_get_group_pins,
.pin_dbg_show = intel_pin_dbg_show,
};
static int intel_get_functions_count(struct pinctrl_dev *pctldev)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
return pctrl->soc->nfunctions;
}
static const char *intel_get_function_name(struct pinctrl_dev *pctldev,
unsigned function)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
return pctrl->soc->functions[function].name;
}
static int intel_get_function_groups(struct pinctrl_dev *pctldev,
unsigned function,
const char * const **groups,
unsigned * const ngroups)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
*groups = pctrl->soc->functions[function].groups;
*ngroups = pctrl->soc->functions[function].ngroups;
return 0;
}
static int intel_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned function,
unsigned group)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
const struct intel_pingroup *grp = &pctrl->soc->groups[group];
unsigned long flags;
int i;
raw_spin_lock_irqsave(&pctrl->lock, flags);
/*
* All pins in the groups needs to be accessible and writable
* before we can enable the mux for this group.
*/
for (i = 0; i < grp->npins; i++) {
if (!intel_pad_usable(pctrl, grp->pins[i])) {
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return -EBUSY;
}
}
/* Now enable the mux setting for each pin in the group */
for (i = 0; i < grp->npins; i++) {
void __iomem *padcfg0;
u32 value;
padcfg0 = intel_get_padcfg(pctrl, grp->pins[i], PADCFG0);
value = readl(padcfg0);
value &= ~PADCFG0_PMODE_MASK;
if (grp->modes)
value |= grp->modes[i] << PADCFG0_PMODE_SHIFT;
else
value |= grp->mode << PADCFG0_PMODE_SHIFT;
writel(value, padcfg0);
}
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return 0;
}
static void __intel_gpio_set_direction(void __iomem *padcfg0, bool input)
{
u32 value;
value = readl(padcfg0);
if (input) {
value &= ~PADCFG0_GPIORXDIS;
value |= PADCFG0_GPIOTXDIS;
} else {
value &= ~PADCFG0_GPIOTXDIS;
value |= PADCFG0_GPIORXDIS;
}
writel(value, padcfg0);
}
static void intel_gpio_set_gpio_mode(void __iomem *padcfg0)
{
u32 value;
/* Put the pad into GPIO mode */
value = readl(padcfg0) & ~PADCFG0_PMODE_MASK;
/* Disable SCI/SMI/NMI generation */
value &= ~(PADCFG0_GPIROUTIOXAPIC | PADCFG0_GPIROUTSCI);
value &= ~(PADCFG0_GPIROUTSMI | PADCFG0_GPIROUTNMI);
writel(value, padcfg0);
}
static int intel_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned pin)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
void __iomem *padcfg0;
unsigned long flags;
raw_spin_lock_irqsave(&pctrl->lock, flags);
if (!intel_pad_usable(pctrl, pin)) {
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return -EBUSY;
}
padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
intel_gpio_set_gpio_mode(padcfg0);
/* Disable TX buffer and enable RX (this will be input) */
__intel_gpio_set_direction(padcfg0, true);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return 0;
}
static int intel_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned pin, bool input)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
void __iomem *padcfg0;
unsigned long flags;
raw_spin_lock_irqsave(&pctrl->lock, flags);
padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
__intel_gpio_set_direction(padcfg0, input);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return 0;
}
static const struct pinmux_ops intel_pinmux_ops = {
.get_functions_count = intel_get_functions_count,
.get_function_name = intel_get_function_name,
.get_function_groups = intel_get_function_groups,
.set_mux = intel_pinmux_set_mux,
.gpio_request_enable = intel_gpio_request_enable,
.gpio_set_direction = intel_gpio_set_direction,
};
static int intel_config_get(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long *config)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
const struct intel_community *community;
u32 value, term;
u32 arg = 0;
if (!intel_pad_owned_by_host(pctrl, pin))
return -ENOTSUPP;
community = intel_get_community(pctrl, pin);
value = readl(intel_get_padcfg(pctrl, pin, PADCFG1));
term = (value & PADCFG1_TERM_MASK) >> PADCFG1_TERM_SHIFT;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
if (term)
return -EINVAL;
break;
case PIN_CONFIG_BIAS_PULL_UP:
if (!term || !(value & PADCFG1_TERM_UP))
return -EINVAL;
switch (term) {
case PADCFG1_TERM_1K:
arg = 1000;
break;
case PADCFG1_TERM_2K:
arg = 2000;
break;
case PADCFG1_TERM_5K:
arg = 5000;
break;
case PADCFG1_TERM_20K:
arg = 20000;
break;
}
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if (!term || value & PADCFG1_TERM_UP)
return -EINVAL;
switch (term) {
case PADCFG1_TERM_1K:
if (!(community->features & PINCTRL_FEATURE_1K_PD))
return -EINVAL;
arg = 1000;
break;
case PADCFG1_TERM_5K:
arg = 5000;
break;
case PADCFG1_TERM_20K:
arg = 20000;
break;
}
break;
case PIN_CONFIG_INPUT_DEBOUNCE: {
void __iomem *padcfg2;
u32 v;
padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2);
if (!padcfg2)
return -ENOTSUPP;
v = readl(padcfg2);
if (!(v & PADCFG2_DEBEN))
return -EINVAL;
v = (v & PADCFG2_DEBOUNCE_MASK) >> PADCFG2_DEBOUNCE_SHIFT;
arg = BIT(v) * DEBOUNCE_PERIOD / 1000;
break;
}
default:
return -ENOTSUPP;
}
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned pin,
unsigned long config)
{
unsigned param = pinconf_to_config_param(config);
unsigned arg = pinconf_to_config_argument(config);
const struct intel_community *community;
void __iomem *padcfg1;
unsigned long flags;
int ret = 0;
u32 value;
raw_spin_lock_irqsave(&pctrl->lock, flags);
community = intel_get_community(pctrl, pin);
padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1);
value = readl(padcfg1);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
value &= ~(PADCFG1_TERM_MASK | PADCFG1_TERM_UP);
break;
case PIN_CONFIG_BIAS_PULL_UP:
value &= ~PADCFG1_TERM_MASK;
value |= PADCFG1_TERM_UP;
switch (arg) {
case 20000:
value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;
break;
case 5000:
value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
break;
case 2000:
value |= PADCFG1_TERM_2K << PADCFG1_TERM_SHIFT;
break;
case 1000:
value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT;
break;
default:
ret = -EINVAL;
}
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
value &= ~(PADCFG1_TERM_UP | PADCFG1_TERM_MASK);
switch (arg) {
case 20000:
value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;
break;
case 5000:
value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
break;
case 1000:
if (!(community->features & PINCTRL_FEATURE_1K_PD)) {
ret = -EINVAL;
break;
}
value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT;
break;
default:
ret = -EINVAL;
}
break;
}
if (!ret)
writel(value, padcfg1);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return ret;
}
static int intel_config_set_debounce(struct intel_pinctrl *pctrl, unsigned pin,
unsigned debounce)
{
void __iomem *padcfg0, *padcfg2;
unsigned long flags;
u32 value0, value2;
int ret = 0;
padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2);
if (!padcfg2)
return -ENOTSUPP;
padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
raw_spin_lock_irqsave(&pctrl->lock, flags);
value0 = readl(padcfg0);
value2 = readl(padcfg2);
/* Disable glitch filter and debouncer */
value0 &= ~PADCFG0_PREGFRXSEL;
value2 &= ~(PADCFG2_DEBEN | PADCFG2_DEBOUNCE_MASK);
if (debounce) {
unsigned long v;
v = order_base_2(debounce * 1000 / DEBOUNCE_PERIOD);
if (v < 3 || v > 15) {
ret = -EINVAL;
goto exit_unlock;
} else {
/* Enable glitch filter and debouncer */
value0 |= PADCFG0_PREGFRXSEL;
value2 |= v << PADCFG2_DEBOUNCE_SHIFT;
value2 |= PADCFG2_DEBEN;
}
}
writel(value0, padcfg0);
writel(value2, padcfg2);
exit_unlock:
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return ret;
}
static int intel_config_set(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long *configs, unsigned nconfigs)
{
struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
int i, ret;
if (!intel_pad_usable(pctrl, pin))
return -ENOTSUPP;
for (i = 0; i < nconfigs; i++) {
switch (pinconf_to_config_param(configs[i])) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
ret = intel_config_set_pull(pctrl, pin, configs[i]);
if (ret)
return ret;
break;
case PIN_CONFIG_INPUT_DEBOUNCE:
ret = intel_config_set_debounce(pctrl, pin,
pinconf_to_config_argument(configs[i]));
if (ret)
return ret;
break;
default:
return -ENOTSUPP;
}
}
return 0;
}
static const struct pinconf_ops intel_pinconf_ops = {
.is_generic = true,
.pin_config_get = intel_config_get,
.pin_config_set = intel_config_set,
};
static const struct pinctrl_desc intel_pinctrl_desc = {
.pctlops = &intel_pinctrl_ops,
.pmxops = &intel_pinmux_ops,
.confops = &intel_pinconf_ops,
.owner = THIS_MODULE,
};
static int intel_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
void __iomem *reg;
u32 padcfg0;
reg = intel_get_padcfg(pctrl, offset, PADCFG0);
if (!reg)
return -EINVAL;
padcfg0 = readl(reg);
if (!(padcfg0 & PADCFG0_GPIOTXDIS))
return !!(padcfg0 & PADCFG0_GPIOTXSTATE);
return !!(padcfg0 & PADCFG0_GPIORXSTATE);
}
static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
unsigned long flags;
void __iomem *reg;
u32 padcfg0;
reg = intel_get_padcfg(pctrl, offset, PADCFG0);
if (!reg)
return;
raw_spin_lock_irqsave(&pctrl->lock, flags);
padcfg0 = readl(reg);
if (value)
padcfg0 |= PADCFG0_GPIOTXSTATE;
else
padcfg0 &= ~PADCFG0_GPIOTXSTATE;
writel(padcfg0, reg);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
}
static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_gpio_direction_input(chip->base + offset);
}
static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
intel_gpio_set(chip, offset, value);
return pinctrl_gpio_direction_output(chip->base + offset);
}
static const struct gpio_chip intel_gpio_chip = {
.owner = THIS_MODULE,
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.direction_input = intel_gpio_direction_input,
.direction_output = intel_gpio_direction_output,
.get = intel_gpio_get,
.set = intel_gpio_set,
.set_config = gpiochip_generic_config,
};
/**
* intel_gpio_to_pin() - Translate from GPIO offset to pin number
* @pctrl: Pinctrl structure
* @offset: GPIO offset from gpiolib
* @commmunity: Community is filled here if not %NULL
* @padgrp: Pad group is filled here if not %NULL
*
* When coming through gpiolib irqchip, the GPIO offset is not
* automatically translated to pinctrl pin number. This function can be
* used to find out the corresponding pinctrl pin.
*/
static int intel_gpio_to_pin(struct intel_pinctrl *pctrl, unsigned offset,
const struct intel_community **community,
const struct intel_padgroup **padgrp)
{
int i;
for (i = 0; i < pctrl->ncommunities; i++) {
const struct intel_community *comm = &pctrl->communities[i];
int j;
for (j = 0; j < comm->ngpps; j++) {
const struct intel_padgroup *pgrp = &comm->gpps[j];
if (pgrp->gpio_base < 0)
continue;
if (offset >= pgrp->gpio_base &&
offset < pgrp->gpio_base + pgrp->size) {
int pin;
pin = pgrp->base + offset - pgrp->gpio_base;
if (community)
*community = comm;
if (padgrp)
*padgrp = pgrp;
return pin;
}
}
}
return -EINVAL;
}
static void intel_gpio_irq_ack(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
const struct intel_community *community;
const struct intel_padgroup *padgrp;
int pin;
pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp);
if (pin >= 0) {
unsigned gpp, gpp_offset, is_offset;
gpp = padgrp->reg_num;
gpp_offset = padgroup_offset(padgrp, pin);
is_offset = community->is_offset + gpp * 4;
raw_spin_lock(&pctrl->lock);
writel(BIT(gpp_offset), community->regs + is_offset);
raw_spin_unlock(&pctrl->lock);
}
}
static void intel_gpio_irq_enable(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
const struct intel_community *community;
const struct intel_padgroup *padgrp;
int pin;
pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp);
if (pin >= 0) {
unsigned gpp, gpp_offset, is_offset;
unsigned long flags;
u32 value;
gpp = padgrp->reg_num;
gpp_offset = padgroup_offset(padgrp, pin);
is_offset = community->is_offset + gpp * 4;
raw_spin_lock_irqsave(&pctrl->lock, flags);
/* Clear interrupt status first to avoid unexpected interrupt */
writel(BIT(gpp_offset), community->regs + is_offset);
value = readl(community->regs + community->ie_offset + gpp * 4);
value |= BIT(gpp_offset);
writel(value, community->regs + community->ie_offset + gpp * 4);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
}
}
static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
const struct intel_community *community;
const struct intel_padgroup *padgrp;
int pin;
pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp);
if (pin >= 0) {
unsigned gpp, gpp_offset;
unsigned long flags;
void __iomem *reg;
u32 value;
gpp = padgrp->reg_num;
gpp_offset = padgroup_offset(padgrp, pin);
reg = community->regs + community->ie_offset + gpp * 4;
raw_spin_lock_irqsave(&pctrl->lock, flags);
value = readl(reg);
if (mask)
value &= ~BIT(gpp_offset);
else
value |= BIT(gpp_offset);
writel(value, reg);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
}
}
static void intel_gpio_irq_mask(struct irq_data *d)
{
intel_gpio_irq_mask_unmask(d, true);
}
static void intel_gpio_irq_unmask(struct irq_data *d)
{
intel_gpio_irq_mask_unmask(d, false);
}
static int intel_gpio_irq_type(struct irq_data *d, unsigned type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
unsigned pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL);
unsigned long flags;
void __iomem *reg;
u32 value;
reg = intel_get_padcfg(pctrl, pin, PADCFG0);
if (!reg)
return -EINVAL;
/*
* If the pin is in ACPI mode it is still usable as a GPIO but it
* cannot be used as IRQ because GPI_IS status bit will not be
* updated by the host controller hardware.
*/
if (intel_pad_acpi_mode(pctrl, pin)) {
dev_warn(pctrl->dev, "pin %u cannot be used as IRQ\n", pin);
return -EPERM;
}
raw_spin_lock_irqsave(&pctrl->lock, flags);
intel_gpio_set_gpio_mode(reg);
value = readl(reg);
value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV);
if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
value |= PADCFG0_RXEVCFG_EDGE_BOTH << PADCFG0_RXEVCFG_SHIFT;
} else if (type & IRQ_TYPE_EDGE_FALLING) {
value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
value |= PADCFG0_RXINV;
} else if (type & IRQ_TYPE_EDGE_RISING) {
value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
} else if (type & IRQ_TYPE_LEVEL_MASK) {
if (type & IRQ_TYPE_LEVEL_LOW)
value |= PADCFG0_RXINV;
} else {
value |= PADCFG0_RXEVCFG_DISABLED << PADCFG0_RXEVCFG_SHIFT;
}
writel(value, reg);
if (type & IRQ_TYPE_EDGE_BOTH)
irq_set_handler_locked(d, handle_edge_irq);
else if (type & IRQ_TYPE_LEVEL_MASK)
irq_set_handler_locked(d, handle_level_irq);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return 0;
}
static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
unsigned pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL);
if (on)
enable_irq_wake(pctrl->irq);
else
disable_irq_wake(pctrl->irq);
dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin);
return 0;
}
static irqreturn_t intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl,
const struct intel_community *community)
{
struct gpio_chip *gc = &pctrl->chip;
irqreturn_t ret = IRQ_NONE;
int gpp;
for (gpp = 0; gpp < community->ngpps; gpp++) {
const struct intel_padgroup *padgrp = &community->gpps[gpp];
unsigned long pending, enabled, gpp_offset;
pending = readl(community->regs + community->is_offset +
padgrp->reg_num * 4);
enabled = readl(community->regs + community->ie_offset +
padgrp->reg_num * 4);
/* Only interrupts that are enabled */
pending &= enabled;
for_each_set_bit(gpp_offset, &pending, padgrp->size) {
unsigned irq;
irq = irq_find_mapping(gc->irq.domain,
padgrp->gpio_base + gpp_offset);
generic_handle_irq(irq);
ret |= IRQ_HANDLED;
}
}
return ret;
}
static irqreturn_t intel_gpio_irq(int irq, void *data)
{
const struct intel_community *community;
struct intel_pinctrl *pctrl = data;
irqreturn_t ret = IRQ_NONE;
int i;
/* Need to check all communities for pending interrupts */
for (i = 0; i < pctrl->ncommunities; i++) {
community = &pctrl->communities[i];
ret |= intel_gpio_community_irq_handler(pctrl, community);
}
return ret;
}
static struct irq_chip intel_gpio_irqchip = {
.name = "intel-gpio",
.irq_enable = intel_gpio_irq_enable,
.irq_ack = intel_gpio_irq_ack,
.irq_mask = intel_gpio_irq_mask,
.irq_unmask = intel_gpio_irq_unmask,
.irq_set_type = intel_gpio_irq_type,
.irq_set_wake = intel_gpio_irq_wake,
.flags = IRQCHIP_MASK_ON_SUSPEND,
};
static int intel_gpio_add_pin_ranges(struct intel_pinctrl *pctrl,
const struct intel_community *community)
{
int ret, i;
for (i = 0; i < community->ngpps; i++) {
const struct intel_padgroup *gpp = &community->gpps[i];
if (gpp->gpio_base < 0)
continue;
ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev),
gpp->gpio_base, gpp->base,
gpp->size);
if (ret)
return ret;
}
return ret;
}
static unsigned intel_gpio_ngpio(const struct intel_pinctrl *pctrl)
{
const struct intel_community *community;
unsigned ngpio = 0;
int i, j;
for (i = 0; i < pctrl->ncommunities; i++) {
community = &pctrl->communities[i];
for (j = 0; j < community->ngpps; j++) {
const struct intel_padgroup *gpp = &community->gpps[j];
if (gpp->gpio_base < 0)
continue;
if (gpp->gpio_base + gpp->size > ngpio)
ngpio = gpp->gpio_base + gpp->size;
}
}
return ngpio;
}
static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq)
{
int ret, i;
pctrl->chip = intel_gpio_chip;
pctrl->chip.ngpio = intel_gpio_ngpio(pctrl);
pctrl->chip.label = dev_name(pctrl->dev);
pctrl->chip.parent = pctrl->dev;
pctrl->chip.base = -1;
pctrl->irq = irq;
ret = devm_gpiochip_add_data(pctrl->dev, &pctrl->chip, pctrl);
if (ret) {
dev_err(pctrl->dev, "failed to register gpiochip\n");
return ret;
}
for (i = 0; i < pctrl->ncommunities; i++) {
struct intel_community *community = &pctrl->communities[i];
ret = intel_gpio_add_pin_ranges(pctrl, community);
if (ret) {
dev_err(pctrl->dev, "failed to add GPIO pin range\n");
return ret;
}
}
/*
* We need to request the interrupt here (instead of providing chip
* to the irq directly) because on some platforms several GPIO
* controllers share the same interrupt line.
*/
ret = devm_request_irq(pctrl->dev, irq, intel_gpio_irq,
IRQF_SHARED | IRQF_NO_THREAD,
dev_name(pctrl->dev), pctrl);
if (ret) {
dev_err(pctrl->dev, "failed to request interrupt\n");
return ret;
}
ret = gpiochip_irqchip_add(&pctrl->chip, &intel_gpio_irqchip, 0,
handle_bad_irq, IRQ_TYPE_NONE);
if (ret) {
dev_err(pctrl->dev, "failed to add irqchip\n");
return ret;
}
gpiochip_set_chained_irqchip(&pctrl->chip, &intel_gpio_irqchip, irq,
NULL);
return 0;
}
static int intel_pinctrl_add_padgroups(struct intel_pinctrl *pctrl,
struct intel_community *community)
{
struct intel_padgroup *gpps;
unsigned npins = community->npins;
unsigned padown_num = 0;
size_t ngpps, i;
if (community->gpps)
ngpps = community->ngpps;
else
ngpps = DIV_ROUND_UP(community->npins, community->gpp_size);
gpps = devm_kcalloc(pctrl->dev, ngpps, sizeof(*gpps), GFP_KERNEL);
if (!gpps)
return -ENOMEM;
for (i = 0; i < ngpps; i++) {
if (community->gpps) {
gpps[i] = community->gpps[i];
} else {
unsigned gpp_size = community->gpp_size;
gpps[i].reg_num = i;
gpps[i].base = community->pin_base + i * gpp_size;
gpps[i].size = min(gpp_size, npins);
npins -= gpps[i].size;
}
if (gpps[i].size > 32)
return -EINVAL;
if (!gpps[i].gpio_base)
gpps[i].gpio_base = gpps[i].base;
gpps[i].padown_num = padown_num;
/*
* In older hardware the number of padown registers per
* group is fixed regardless of the group size.
*/
if (community->gpp_num_padown_regs)
padown_num += community->gpp_num_padown_regs;
else
padown_num += DIV_ROUND_UP(gpps[i].size * 4, 32);
}
community->ngpps = ngpps;
community->gpps = gpps;
return 0;
}
static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
{
#ifdef CONFIG_PM_SLEEP
const struct intel_pinctrl_soc_data *soc = pctrl->soc;
struct intel_community_context *communities;
struct intel_pad_context *pads;
int i;
pads = devm_kcalloc(pctrl->dev, soc->npins, sizeof(*pads), GFP_KERNEL);
if (!pads)
return -ENOMEM;
communities = devm_kcalloc(pctrl->dev, pctrl->ncommunities,
sizeof(*communities), GFP_KERNEL);
if (!communities)
return -ENOMEM;
for (i = 0; i < pctrl->ncommunities; i++) {
struct intel_community *community = &pctrl->communities[i];
u32 *intmask;
intmask = devm_kcalloc(pctrl->dev, community->ngpps,
sizeof(*intmask), GFP_KERNEL);
if (!intmask)
return -ENOMEM;
communities[i].intmask = intmask;
}
pctrl->context.pads = pads;
pctrl->context.communities = communities;
#endif
return 0;
}
int intel_pinctrl_probe(struct platform_device *pdev,
const struct intel_pinctrl_soc_data *soc_data)
{
struct intel_pinctrl *pctrl;
int i, ret, irq;
if (!soc_data)
return -EINVAL;
pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
if (!pctrl)
return -ENOMEM;
pctrl->dev = &pdev->dev;
pctrl->soc = soc_data;
raw_spin_lock_init(&pctrl->lock);
/*
* Make a copy of the communities which we can use to hold pointers
* to the registers.
*/
pctrl->ncommunities = pctrl->soc->ncommunities;
pctrl->communities = devm_kcalloc(&pdev->dev, pctrl->ncommunities,
sizeof(*pctrl->communities), GFP_KERNEL);
if (!pctrl->communities)
return -ENOMEM;
for (i = 0; i < pctrl->ncommunities; i++) {
struct intel_community *community = &pctrl->communities[i];
struct resource *res;
void __iomem *regs;
u32 padbar;
*community = pctrl->soc->communities[i];
res = platform_get_resource(pdev, IORESOURCE_MEM,
community->barno);
regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(regs))
return PTR_ERR(regs);
/*
* Determine community features based on the revision if
* not specified already.
*/
if (!community->features) {
u32 rev;
rev = (readl(regs + REVID) & REVID_MASK) >> REVID_SHIFT;
if (rev >= 0x94) {
community->features |= PINCTRL_FEATURE_DEBOUNCE;
community->features |= PINCTRL_FEATURE_1K_PD;
}
}
/* Read offset of the pad configuration registers */
padbar = readl(regs + PADBAR);
community->regs = regs;
community->pad_regs = regs + padbar;
if (!community->is_offset)
community->is_offset = GPI_IS;
ret = intel_pinctrl_add_padgroups(pctrl, community);
if (ret)
return ret;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "failed to get interrupt number\n");
return irq;
}
ret = intel_pinctrl_pm_init(pctrl);
if (ret)
return ret;
pctrl->pctldesc = intel_pinctrl_desc;
pctrl->pctldesc.name = dev_name(&pdev->dev);
pctrl->pctldesc.pins = pctrl->soc->pins;
pctrl->pctldesc.npins = pctrl->soc->npins;
pctrl->pctldev = devm_pinctrl_register(&pdev->dev, &pctrl->pctldesc,
pctrl);
if (IS_ERR(pctrl->pctldev)) {
dev_err(&pdev->dev, "failed to register pinctrl driver\n");
return PTR_ERR(pctrl->pctldev);
}
ret = intel_gpio_probe(pctrl, irq);
if (ret)
return ret;
platform_set_drvdata(pdev, pctrl);
return 0;
}
EXPORT_SYMBOL_GPL(intel_pinctrl_probe);
#ifdef CONFIG_PM_SLEEP
static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned pin)
{
const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin);
if (!pd || !intel_pad_usable(pctrl, pin))
return false;
/*
* Only restore the pin if it is actually in use by the kernel (or
* by userspace). It is possible that some pins are used by the
* BIOS during resume and those are not always locked down so leave
* them alone.
*/
if (pd->mux_owner || pd->gpio_owner ||
gpiochip_line_is_irq(&pctrl->chip, pin))
return true;
return false;
}
int intel_pinctrl_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct intel_pinctrl *pctrl = platform_get_drvdata(pdev);
struct intel_community_context *communities;
struct intel_pad_context *pads;
int i;
pads = pctrl->context.pads;
for (i = 0; i < pctrl->soc->npins; i++) {
const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
void __iomem *padcfg;
u32 val;
if (!intel_pinctrl_should_save(pctrl, desc->number))
continue;
val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG0));
pads[i].padcfg0 = val & ~PADCFG0_GPIORXSTATE;
val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG1));
pads[i].padcfg1 = val;
padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG2);
if (padcfg)
pads[i].padcfg2 = readl(padcfg);
}
communities = pctrl->context.communities;
for (i = 0; i < pctrl->ncommunities; i++) {
struct intel_community *community = &pctrl->communities[i];
void __iomem *base;
unsigned gpp;
base = community->regs + community->ie_offset;
for (gpp = 0; gpp < community->ngpps; gpp++)
communities[i].intmask[gpp] = readl(base + gpp * 4);
}
return 0;
}
EXPORT_SYMBOL_GPL(intel_pinctrl_suspend);
static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
{
size_t i;
for (i = 0; i < pctrl->ncommunities; i++) {
const struct intel_community *community;
void __iomem *base;
unsigned gpp;
community = &pctrl->communities[i];
base = community->regs;
for (gpp = 0; gpp < community->ngpps; gpp++) {
/* Mask and clear all interrupts */
writel(0, base + community->ie_offset + gpp * 4);
writel(0xffff, base + community->is_offset + gpp * 4);
}
}
}
int intel_pinctrl_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct intel_pinctrl *pctrl = platform_get_drvdata(pdev);
const struct intel_community_context *communities;
const struct intel_pad_context *pads;
int i;
/* Mask all interrupts */
intel_gpio_irq_init(pctrl);
pads = pctrl->context.pads;
for (i = 0; i < pctrl->soc->npins; i++) {
const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
void __iomem *padcfg;
u32 val;
if (!intel_pinctrl_should_save(pctrl, desc->number))
continue;
padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG0);
val = readl(padcfg) & ~PADCFG0_GPIORXSTATE;
if (val != pads[i].padcfg0) {
writel(pads[i].padcfg0, padcfg);
dev_dbg(dev, "restored pin %u padcfg0 %#08x\n",
desc->number, readl(padcfg));
}
padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG1);
val = readl(padcfg);
if (val != pads[i].padcfg1) {
writel(pads[i].padcfg1, padcfg);
dev_dbg(dev, "restored pin %u padcfg1 %#08x\n",
desc->number, readl(padcfg));
}
padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG2);
if (padcfg) {
val = readl(padcfg);
if (val != pads[i].padcfg2) {
writel(pads[i].padcfg2, padcfg);
dev_dbg(dev, "restored pin %u padcfg2 %#08x\n",
desc->number, readl(padcfg));
}
}
}
communities = pctrl->context.communities;
for (i = 0; i < pctrl->ncommunities; i++) {
struct intel_community *community = &pctrl->communities[i];
void __iomem *base;
unsigned gpp;
base = community->regs + community->ie_offset;
for (gpp = 0; gpp < community->ngpps; gpp++) {
writel(communities[i].intmask[gpp], base + gpp * 4);
dev_dbg(dev, "restored mask %d/%u %#08x\n", i, gpp,
readl(base + gpp * 4));
}
}
return 0;
}
EXPORT_SYMBOL_GPL(intel_pinctrl_resume);
#endif
MODULE_AUTHOR("Mathias Nyman <mathias.nyman@linux.intel.com>");
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
MODULE_DESCRIPTION("Intel pinctrl/GPIO core driver");
MODULE_LICENSE("GPL v2");