// SPDX-License-Identifier: GPL-2.0-only
/*
* GPIO driver for AMD
*
* Copyright (c) 2014,2015 AMD Corporation.
* Authors: Ken Xue <[email protected]>
* Wu, Jeff <[email protected]>
*
*/
#include <linux/err.h>
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/log2.h>
#include <linux/io.h>
#include <linux/gpio/driver.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/bitops.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/suspend.h>
#include "core.h"
#include "pinctrl-utils.h"
#include "pinctrl-amd.h"
static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
{
unsigned long flags;
u32 pin_reg;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
if (pin_reg & BIT(OUTPUT_ENABLE_OFF))
return GPIO_LINE_DIRECTION_OUT;
return GPIO_LINE_DIRECTION_IN;
}
static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
unsigned long flags;
u32 pin_reg;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
writel(pin_reg, gpio_dev->base + offset * 4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return 0;
}
static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
int value)
{
u32 pin_reg;
unsigned long flags;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
pin_reg |= BIT(OUTPUT_ENABLE_OFF);
if (value)
pin_reg |= BIT(OUTPUT_VALUE_OFF);
else
pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
writel(pin_reg, gpio_dev->base + offset * 4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return 0;
}
static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
{
u32 pin_reg;
unsigned long flags;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return !!(pin_reg & BIT(PIN_STS_OFF));
}
static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
{
u32 pin_reg;
unsigned long flags;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
if (value)
pin_reg |= BIT(OUTPUT_VALUE_OFF);
else
pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
writel(pin_reg, gpio_dev->base + offset * 4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static int amd_gpio_set_debounce(struct amd_gpio *gpio_dev, unsigned int offset,
unsigned int debounce)
{
u32 time;
u32 pin_reg;
int ret = 0;
/* Use special handling for Pin0 debounce */
if (offset == 0) {
pin_reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
if (pin_reg & INTERNAL_GPIO0_DEBOUNCE)
debounce = 0;
}
pin_reg = readl(gpio_dev->base + offset * 4);
if (debounce) {
pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
pin_reg &= ~DB_TMR_OUT_MASK;
/*
Debounce Debounce Timer Max
TmrLarge TmrOutUnit Unit Debounce
Time
0 0 61 usec (2 RtcClk) 976 usec
0 1 244 usec (8 RtcClk) 3.9 msec
1 0 15.6 msec (512 RtcClk) 250 msec
1 1 62.5 msec (2048 RtcClk) 1 sec
*/
if (debounce < 61) {
pin_reg |= 1;
pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
} else if (debounce < 976) {
time = debounce / 61;
pin_reg |= time & DB_TMR_OUT_MASK;
pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
} else if (debounce < 3900) {
time = debounce / 244;
pin_reg |= time & DB_TMR_OUT_MASK;
pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
} else if (debounce < 250000) {
time = debounce / 15625;
pin_reg |= time & DB_TMR_OUT_MASK;
pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
pin_reg |= BIT(DB_TMR_LARGE_OFF);
} else if (debounce < 1000000) {
time = debounce / 62500;
pin_reg |= time & DB_TMR_OUT_MASK;
pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
pin_reg |= BIT(DB_TMR_LARGE_OFF);
} else {
pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
ret = -EINVAL;
}
} else {
pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
pin_reg &= ~DB_TMR_OUT_MASK;
pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
}
writel(pin_reg, gpio_dev->base + offset * 4);
return ret;
}
#ifdef CONFIG_DEBUG_FS
static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
{
u32 pin_reg;
u32 db_cntrl;
unsigned long flags;
unsigned int bank, i, pin_num;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
bool tmr_out_unit;
bool tmr_large;
char *level_trig;
char *active_level;
char *interrupt_mask;
char *wake_cntrl0;
char *wake_cntrl1;
char *wake_cntrl2;
char *pin_sts;
char *interrupt_sts;
char *wake_sts;
char *orientation;
char debounce_value[40];
char *debounce_enable;
char *wake_cntrlz;
seq_printf(s, "WAKE_INT_MASTER_REG: 0x%08x\n", readl(gpio_dev->base + WAKE_INT_MASTER_REG));
for (bank = 0; bank < gpio_dev->hwbank_num; bank++) {
unsigned int time = 0;
unsigned int unit = 0;
switch (bank) {
case 0:
i = 0;
pin_num = AMD_GPIO_PINS_BANK0;
break;
case 1:
i = 64;
pin_num = AMD_GPIO_PINS_BANK1 + i;
break;
case 2:
i = 128;
pin_num = AMD_GPIO_PINS_BANK2 + i;
break;
case 3:
i = 192;
pin_num = AMD_GPIO_PINS_BANK3 + i;
break;
default:
/* Illegal bank number, ignore */
continue;
}
seq_printf(s, "GPIO bank%d\n", bank);
seq_puts(s, "gpio\t int|active|trigger|S0i3| S3|S4/S5| Z|wake|pull| orient| debounce|reg\n");
for (; i < pin_num; i++) {
seq_printf(s, "#%d\t", i);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + i * 4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) &
ACTIVE_LEVEL_MASK;
if (level == ACTIVE_LEVEL_HIGH)
active_level = "↑";
else if (level == ACTIVE_LEVEL_LOW)
active_level = "↓";
else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) &&
level == ACTIVE_LEVEL_BOTH)
active_level = "b";
else
active_level = "?";
if (pin_reg & BIT(LEVEL_TRIG_OFF))
level_trig = "level";
else
level_trig = " edge";
if (pin_reg & BIT(INTERRUPT_MASK_OFF))
interrupt_mask = "😛";
else
interrupt_mask = "😷";
if (pin_reg & BIT(INTERRUPT_STS_OFF))
interrupt_sts = "🔥";
else
interrupt_sts = " ";
seq_printf(s, "%s %s| %s| %s|",
interrupt_sts,
interrupt_mask,
active_level,
level_trig);
} else
seq_puts(s, " ∅| | |");
if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3))
wake_cntrl0 = "⏰";
else
wake_cntrl0 = " ";
seq_printf(s, " %s| ", wake_cntrl0);
if (pin_reg & BIT(WAKE_CNTRL_OFF_S3))
wake_cntrl1 = "⏰";
else
wake_cntrl1 = " ";
seq_printf(s, "%s|", wake_cntrl1);
if (pin_reg & BIT(WAKE_CNTRL_OFF_S4))
wake_cntrl2 = "⏰";
else
wake_cntrl2 = " ";
seq_printf(s, " %s|", wake_cntrl2);
if (pin_reg & BIT(WAKECNTRL_Z_OFF))
wake_cntrlz = "⏰";
else
wake_cntrlz = " ";
seq_printf(s, "%s|", wake_cntrlz);
if (pin_reg & BIT(WAKE_STS_OFF))
wake_sts = "🔥";
else
wake_sts = " ";
seq_printf(s, " %s|", wake_sts);
if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
seq_puts(s, " ↑ |");
} else if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF)) {
seq_puts(s, " ↓ |");
} else {
seq_puts(s, " |");
}
if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
pin_sts = "output";
if (pin_reg & BIT(OUTPUT_VALUE_OFF))
orientation = "↑";
else
orientation = "↓";
} else {
pin_sts = "input ";
if (pin_reg & BIT(PIN_STS_OFF))
orientation = "↑";
else
orientation = "↓";
}
seq_printf(s, "%s %s|", pin_sts, orientation);
db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg;
if (db_cntrl) {
tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF);
tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF);
time = pin_reg & DB_TMR_OUT_MASK;
if (tmr_large) {
if (tmr_out_unit)
unit = 62500;
else
unit = 15625;
} else {
if (tmr_out_unit)
unit = 244;
else
unit = 61;
}
if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl)
debounce_enable = "b";
else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl)
debounce_enable = "↓";
else
debounce_enable = "↑";
snprintf(debounce_value, sizeof(debounce_value), "%06u", time * unit);
seq_printf(s, "%s (🕑 %sus)|", debounce_enable, debounce_value);
} else {
seq_puts(s, " |");
}
seq_printf(s, "0x%x\n", pin_reg);
}
}
}
#else
#define amd_gpio_dbg_show NULL
#endif
static void amd_gpio_irq_enable(struct irq_data *d)
{
u32 pin_reg;
unsigned long flags;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
gpiochip_enable_irq(gc, d->hwirq);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
pin_reg |= BIT(INTERRUPT_MASK_OFF);
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static void amd_gpio_irq_disable(struct irq_data *d)
{
u32 pin_reg;
unsigned long flags;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
gpiochip_disable_irq(gc, d->hwirq);
}
static void amd_gpio_irq_mask(struct irq_data *d)
{
u32 pin_reg;
unsigned long flags;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static void amd_gpio_irq_unmask(struct irq_data *d)
{
u32 pin_reg;
unsigned long flags;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
pin_reg |= BIT(INTERRUPT_MASK_OFF);
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
{
u32 pin_reg;
unsigned long flags;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3);
int err;
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
if (on)
pin_reg |= wake_mask;
else
pin_reg &= ~wake_mask;
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
if (on)
err = enable_irq_wake(gpio_dev->irq);
else
err = disable_irq_wake(gpio_dev->irq);
if (err)
dev_err(&gpio_dev->pdev->dev, "failed to %s wake-up interrupt\n",
on ? "enable" : "disable");
return 0;
}
static void amd_gpio_irq_eoi(struct irq_data *d)
{
u32 reg;
unsigned long flags;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
reg |= EOI_MASK;
writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
int ret = 0;
u32 pin_reg, pin_reg_irq_en, mask;
unsigned long flags;
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_RISING:
pin_reg &= ~BIT(LEVEL_TRIG_OFF);
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
irq_set_handler_locked(d, handle_edge_irq);
break;
case IRQ_TYPE_EDGE_FALLING:
pin_reg &= ~BIT(LEVEL_TRIG_OFF);
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
irq_set_handler_locked(d, handle_edge_irq);
break;
case IRQ_TYPE_EDGE_BOTH:
pin_reg &= ~BIT(LEVEL_TRIG_OFF);
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF;
irq_set_handler_locked(d, handle_edge_irq);
break;
case IRQ_TYPE_LEVEL_HIGH:
pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
irq_set_handler_locked(d, handle_level_irq);
break;
case IRQ_TYPE_LEVEL_LOW:
pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
irq_set_handler_locked(d, handle_level_irq);
break;
case IRQ_TYPE_NONE:
break;
default:
dev_err(&gpio_dev->pdev->dev, "Invalid type value\n");
ret = -EINVAL;
}
pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
/*
* If WAKE_INT_MASTER_REG.MaskStsEn is set, a software write to the
* debounce registers of any GPIO will block wake/interrupt status
* generation for *all* GPIOs for a length of time that depends on
* WAKE_INT_MASTER_REG.MaskStsLength[11:0]. During this period the
* INTERRUPT_ENABLE bit will read as 0.
*
* We temporarily enable irq for the GPIO whose configuration is
* changing, and then wait for it to read back as 1 to know when
* debounce has settled and then disable the irq again.
* We do this polling with the spinlock held to ensure other GPIO
* access routines do not read an incorrect value for the irq enable
* bit of other GPIOs. We keep the GPIO masked while polling to avoid
* spurious irqs, and disable the irq again after polling.
*/
mask = BIT(INTERRUPT_ENABLE_OFF);
pin_reg_irq_en = pin_reg;
pin_reg_irq_en |= mask;
pin_reg_irq_en &= ~BIT(INTERRUPT_MASK_OFF);
writel(pin_reg_irq_en, gpio_dev->base + (d->hwirq)*4);
while ((readl(gpio_dev->base + (d->hwirq)*4) & mask) != mask)
continue;
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return ret;
}
static void amd_irq_ack(struct irq_data *d)
{
/*
* based on HW design,there is no need to ack HW
* before handle current irq. But this routine is
* necessary for handle_edge_irq
*/
}
static const struct irq_chip amd_gpio_irqchip = {
.name = "amd_gpio",
.irq_ack = amd_irq_ack,
.irq_enable = amd_gpio_irq_enable,
.irq_disable = amd_gpio_irq_disable,
.irq_mask = amd_gpio_irq_mask,
.irq_unmask = amd_gpio_irq_unmask,
.irq_set_wake = amd_gpio_irq_set_wake,
.irq_eoi = amd_gpio_irq_eoi,
.irq_set_type = amd_gpio_irq_set_type,
/*
* We need to set IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND so that a wake event
* also generates an IRQ. We need the IRQ so the irq_handler can clear
* the wake event. Otherwise the wake event will never clear and
* prevent the system from suspending.
*/
.flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND | IRQCHIP_IMMUTABLE,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
#define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF))
static bool do_amd_gpio_irq_handler(int irq, void *dev_id)
{
struct amd_gpio *gpio_dev = dev_id;
struct gpio_chip *gc = &gpio_dev->gc;
unsigned int i, irqnr;
unsigned long flags;
u32 __iomem *regs;
bool ret = false;
u32 regval;
u64 status, mask;
/* Read the wake status */
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
status = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
status <<= 32;
status |= readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
/* Bit 0-45 contain the relevant status bits */
status &= (1ULL << 46) - 1;
regs = gpio_dev->base;
for (mask = 1, irqnr = 0; status; mask <<= 1, regs += 4, irqnr += 4) {
if (!(status & mask))
continue;
status &= ~mask;
/* Each status bit covers four pins */
for (i = 0; i < 4; i++) {
regval = readl(regs + i);
if (regval & PIN_IRQ_PENDING)
pm_pr_dbg("GPIO %d is active: 0x%x",
irqnr + i, regval);
/* caused wake on resume context for shared IRQ */
if (irq < 0 && (regval & BIT(WAKE_STS_OFF)))
return true;
if (!(regval & PIN_IRQ_PENDING) ||
!(regval & BIT(INTERRUPT_MASK_OFF)))
continue;
generic_handle_domain_irq_safe(gc->irq.domain, irqnr + i);
/* Clear interrupt.
* We must read the pin register again, in case the
* value was changed while executing
* generic_handle_domain_irq() above.
* If the line is not an irq, disable it in order to
* avoid a system hang caused by an interrupt storm.
*/
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
regval = readl(regs + i);
if (!gpiochip_line_is_irq(gc, irqnr + i)) {
regval &= ~BIT(INTERRUPT_MASK_OFF);
dev_dbg(&gpio_dev->pdev->dev,
"Disabling spurious GPIO IRQ %d\n",
irqnr + i);
} else {
ret = true;
}
writel(regval, regs + i);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
}
/* did not cause wake on resume context for shared IRQ */
if (irq < 0)
return false;
/* Signal EOI to the GPIO unit */
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
regval = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
regval |= EOI_MASK;
writel(regval, gpio_dev->base + WAKE_INT_MASTER_REG);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return ret;
}
static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
{
return IRQ_RETVAL(do_amd_gpio_irq_handler(irq, dev_id));
}
static bool __maybe_unused amd_gpio_check_wake(void *dev_id)
{
return do_amd_gpio_irq_handler(-1, dev_id);
}
static int amd_get_groups_count(struct pinctrl_dev *pctldev)
{
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
return gpio_dev->ngroups;
}
static const char *amd_get_group_name(struct pinctrl_dev *pctldev,
unsigned group)
{
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
return gpio_dev->groups[group].name;
}
static int amd_get_group_pins(struct pinctrl_dev *pctldev,
unsigned group,
const unsigned **pins,
unsigned *num_pins)
{
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
*pins = gpio_dev->groups[group].pins;
*num_pins = gpio_dev->groups[group].npins;
return 0;
}
static const struct pinctrl_ops amd_pinctrl_ops = {
.get_groups_count = amd_get_groups_count,
.get_group_name = amd_get_group_name,
.get_group_pins = amd_get_group_pins,
#ifdef CONFIG_OF
.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
.dt_free_map = pinctrl_utils_free_map,
#endif
};
static int amd_pinconf_get(struct pinctrl_dev *pctldev,
unsigned int pin,
unsigned long *config)
{
u32 pin_reg;
unsigned arg;
unsigned long flags;
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + pin*4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
switch (param) {
case PIN_CONFIG_INPUT_DEBOUNCE:
arg = pin_reg & DB_TMR_OUT_MASK;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0);
break;
case PIN_CONFIG_BIAS_PULL_UP:
arg = (pin_reg >> PULL_UP_ENABLE_OFF) & BIT(0);
break;
case PIN_CONFIG_DRIVE_STRENGTH:
arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK;
break;
default:
dev_dbg(&gpio_dev->pdev->dev, "Invalid config param %04x\n",
param);
return -ENOTSUPP;
}
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *configs, unsigned int num_configs)
{
int i;
u32 arg;
int ret = 0;
u32 pin_reg;
unsigned long flags;
enum pin_config_param param;
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
pin_reg = readl(gpio_dev->base + pin*4);
switch (param) {
case PIN_CONFIG_INPUT_DEBOUNCE:
ret = amd_gpio_set_debounce(gpio_dev, pin, arg);
goto out_unlock;
case PIN_CONFIG_BIAS_PULL_DOWN:
pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF);
pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF;
break;
case PIN_CONFIG_BIAS_PULL_UP:
pin_reg &= ~BIT(PULL_UP_ENABLE_OFF);
pin_reg |= (arg & BIT(0)) << PULL_UP_ENABLE_OFF;
break;
case PIN_CONFIG_DRIVE_STRENGTH:
pin_reg &= ~(DRV_STRENGTH_SEL_MASK
<< DRV_STRENGTH_SEL_OFF);
pin_reg |= (arg & DRV_STRENGTH_SEL_MASK)
<< DRV_STRENGTH_SEL_OFF;
break;
default:
dev_dbg(&gpio_dev->pdev->dev,
"Invalid config param %04x\n", param);
ret = -ENOTSUPP;
}
writel(pin_reg, gpio_dev->base + pin*4);
}
out_unlock:
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return ret;
}
static int amd_pinconf_group_get(struct pinctrl_dev *pctldev,
unsigned int group,
unsigned long *config)
{
const unsigned *pins;
unsigned npins;
int ret;
ret = amd_get_group_pins(pctldev, group, &pins, &npins);
if (ret)
return ret;
if (amd_pinconf_get(pctldev, pins[0], config))
return -ENOTSUPP;
return 0;
}
static int amd_pinconf_group_set(struct pinctrl_dev *pctldev,
unsigned group, unsigned long *configs,
unsigned num_configs)
{
const unsigned *pins;
unsigned npins;
int i, ret;
ret = amd_get_group_pins(pctldev, group, &pins, &npins);
if (ret)
return ret;
for (i = 0; i < npins; i++) {
if (amd_pinconf_set(pctldev, pins[i], configs, num_configs))
return -ENOTSUPP;
}
return 0;
}
static int amd_gpio_set_config(struct gpio_chip *gc, unsigned int pin,
unsigned long config)
{
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
return amd_pinconf_set(gpio_dev->pctrl, pin, &config, 1);
}
static const struct pinconf_ops amd_pinconf_ops = {
.pin_config_get = amd_pinconf_get,
.pin_config_set = amd_pinconf_set,
.pin_config_group_get = amd_pinconf_group_get,
.pin_config_group_set = amd_pinconf_group_set,
};
static void amd_gpio_irq_init(struct amd_gpio *gpio_dev)
{
struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
unsigned long flags;
u32 pin_reg, mask;
int i;
mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3) |
BIT(WAKE_CNTRL_OFF_S4);
for (i = 0; i < desc->npins; i++) {
int pin = desc->pins[i].number;
const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
if (!pd)
continue;
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + pin * 4);
pin_reg &= ~mask;
writel(pin_reg, gpio_dev->base + pin * 4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
}
#ifdef CONFIG_PM_SLEEP
static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
{
const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
if (!pd)
return false;
/*
* Only restore the pin if it is actually in use by the kernel (or
* by userspace).
*/
if (pd->mux_owner || pd->gpio_owner ||
gpiochip_line_is_irq(&gpio_dev->gc, pin))
return true;
return false;
}
static int amd_gpio_suspend(struct device *dev)
{
struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
unsigned long flags;
int i;
for (i = 0; i < desc->npins; i++) {
int pin = desc->pins[i].number;
if (!amd_gpio_should_save(gpio_dev, pin))
continue;
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING;
/* mask any interrupts not intended to be a wake source */
if (!(gpio_dev->saved_regs[i] & WAKE_SOURCE)) {
writel(gpio_dev->saved_regs[i] & ~BIT(INTERRUPT_MASK_OFF),
gpio_dev->base + pin * 4);
pm_pr_dbg("Disabling GPIO #%d interrupt for suspend.\n",
pin);
}
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
return 0;
}
static int amd_gpio_resume(struct device *dev)
{
struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
unsigned long flags;
int i;
for (i = 0; i < desc->npins; i++) {
int pin = desc->pins[i].number;
if (!amd_gpio_should_save(gpio_dev, pin))
continue;
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4) & PIN_IRQ_PENDING;
writel(gpio_dev->saved_regs[i], gpio_dev->base + pin * 4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
return 0;
}
static const struct dev_pm_ops amd_gpio_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend,
amd_gpio_resume)
};
#endif
static int amd_get_functions_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(pmx_functions);
}
static const char *amd_get_fname(struct pinctrl_dev *pctrldev, unsigned int selector)
{
return pmx_functions[selector].name;
}
static int amd_get_groups(struct pinctrl_dev *pctrldev, unsigned int selector,
const char * const **groups,
unsigned int * const num_groups)
{
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
if (!gpio_dev->iomux_base) {
dev_err(&gpio_dev->pdev->dev, "iomux function %d group not supported\n", selector);
return -EINVAL;
}
*groups = pmx_functions[selector].groups;
*num_groups = pmx_functions[selector].ngroups;
return 0;
}
static int amd_set_mux(struct pinctrl_dev *pctrldev, unsigned int function, unsigned int group)
{
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
struct device *dev = &gpio_dev->pdev->dev;
struct pin_desc *pd;
int ind, index;
if (!gpio_dev->iomux_base)
return -EINVAL;
for (index = 0; index < NSELECTS; index++) {
if (strcmp(gpio_dev->groups[group].name, pmx_functions[function].groups[index]))
continue;
if (readb(gpio_dev->iomux_base + pmx_functions[function].index) ==
FUNCTION_INVALID) {
dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n",
pmx_functions[function].index);
return -EINVAL;
}
writeb(index, gpio_dev->iomux_base + pmx_functions[function].index);
if (index != (readb(gpio_dev->iomux_base + pmx_functions[function].index) &
FUNCTION_MASK)) {
dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n",
pmx_functions[function].index);
return -EINVAL;
}
for (ind = 0; ind < gpio_dev->groups[group].npins; ind++) {
if (strncmp(gpio_dev->groups[group].name, "IMX_F", strlen("IMX_F")))
continue;
pd = pin_desc_get(gpio_dev->pctrl, gpio_dev->groups[group].pins[ind]);
pd->mux_owner = gpio_dev->groups[group].name;
}
break;
}
return 0;
}
static const struct pinmux_ops amd_pmxops = {
.get_functions_count = amd_get_functions_count,
.get_function_name = amd_get_fname,
.get_function_groups = amd_get_groups,
.set_mux = amd_set_mux,
};
static struct pinctrl_desc amd_pinctrl_desc = {
.pins = kerncz_pins,
.npins = ARRAY_SIZE(kerncz_pins),
.pctlops = &amd_pinctrl_ops,
.pmxops = &amd_pmxops,
.confops = &amd_pinconf_ops,
.owner = THIS_MODULE,
};
static void amd_get_iomux_res(struct amd_gpio *gpio_dev)
{
struct pinctrl_desc *desc = &amd_pinctrl_desc;
struct device *dev = &gpio_dev->pdev->dev;
int index;
index = device_property_match_string(dev, "pinctrl-resource-names", "iomux");
if (index < 0) {
dev_dbg(dev, "iomux not supported\n");
goto out_no_pinmux;
}
gpio_dev->iomux_base = devm_platform_ioremap_resource(gpio_dev->pdev, index);
if (IS_ERR(gpio_dev->iomux_base)) {
dev_dbg(dev, "iomux not supported %d io resource\n", index);
goto out_no_pinmux;
}
return;
out_no_pinmux:
desc->pmxops = NULL;
}
static int amd_gpio_probe(struct platform_device *pdev)
{
int ret = 0;
struct resource *res;
struct amd_gpio *gpio_dev;
struct gpio_irq_chip *girq;
gpio_dev = devm_kzalloc(&pdev->dev,
sizeof(struct amd_gpio), GFP_KERNEL);
if (!gpio_dev)
return -ENOMEM;
raw_spin_lock_init(&gpio_dev->lock);
gpio_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(gpio_dev->base)) {
dev_err(&pdev->dev, "Failed to get gpio io resource.\n");
return PTR_ERR(gpio_dev->base);
}
gpio_dev->irq = platform_get_irq(pdev, 0);
if (gpio_dev->irq < 0)
return gpio_dev->irq;
#ifdef CONFIG_PM_SLEEP
gpio_dev->saved_regs = devm_kcalloc(&pdev->dev, amd_pinctrl_desc.npins,
sizeof(*gpio_dev->saved_regs),
GFP_KERNEL);
if (!gpio_dev->saved_regs)
return -ENOMEM;
#endif
gpio_dev->pdev = pdev;
gpio_dev->gc.get_direction = amd_gpio_get_direction;
gpio_dev->gc.direction_input = amd_gpio_direction_input;
gpio_dev->gc.direction_output = amd_gpio_direction_output;
gpio_dev->gc.get = amd_gpio_get_value;
gpio_dev->gc.set = amd_gpio_set_value;
gpio_dev->gc.set_config = amd_gpio_set_config;
gpio_dev->gc.dbg_show = amd_gpio_dbg_show;
gpio_dev->gc.base = -1;
gpio_dev->gc.label = pdev->name;
gpio_dev->gc.owner = THIS_MODULE;
gpio_dev->gc.parent = &pdev->dev;
gpio_dev->gc.ngpio = resource_size(res) / 4;
gpio_dev->hwbank_num = gpio_dev->gc.ngpio / 64;
gpio_dev->groups = kerncz_groups;
gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
amd_pinctrl_desc.name = dev_name(&pdev->dev);
amd_get_iomux_res(gpio_dev);
gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc,
gpio_dev);
if (IS_ERR(gpio_dev->pctrl)) {
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
return PTR_ERR(gpio_dev->pctrl);
}
/* Disable and mask interrupts */
amd_gpio_irq_init(gpio_dev);
girq = &gpio_dev->gc.irq;
gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip);
/* This will let us handle the parent IRQ in the driver */
girq->parent_handler = NULL;
girq->num_parents = 0;
girq->parents = NULL;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_simple_irq;
ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev);
if (ret)
return ret;
ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
0, 0, gpio_dev->gc.ngpio);
if (ret) {
dev_err(&pdev->dev, "Failed to add pin range\n");
goto out2;
}
ret = devm_request_irq(&pdev->dev, gpio_dev->irq, amd_gpio_irq_handler,
IRQF_SHARED | IRQF_COND_ONESHOT, KBUILD_MODNAME, gpio_dev);
if (ret)
goto out2;
platform_set_drvdata(pdev, gpio_dev);
acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev);
dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
return ret;
out2:
gpiochip_remove(&gpio_dev->gc);
return ret;
}
static void amd_gpio_remove(struct platform_device *pdev)
{
struct amd_gpio *gpio_dev;
gpio_dev = platform_get_drvdata(pdev);
gpiochip_remove(&gpio_dev->gc);
acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev);
}
#ifdef CONFIG_ACPI
static const struct acpi_device_id amd_gpio_acpi_match[] = {
{ "AMD0030", 0 },
{ "AMDI0030", 0},
{ "AMDI0031", 0},
{ },
};
MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
#endif
static struct platform_driver amd_gpio_driver = {
.driver = {
.name = "amd_gpio",
.acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
#ifdef CONFIG_PM_SLEEP
.pm = &amd_gpio_pm_ops,
#endif
},
.probe = amd_gpio_probe,
.remove_new = amd_gpio_remove,
};
module_platform_driver(amd_gpio_driver);
MODULE_AUTHOR("Ken Xue <[email protected]>, Jeff Wu <[email protected]>");
MODULE_DESCRIPTION("AMD GPIO pinctrl driver");
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