#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/gpio/driver.h>
#include <linux/bio.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include "mchp_pci1xxxx_gp.h"
#define PCI1XXXX_NR_PINS 93
#define PCI_DEV_REV_OFFSET 0x08
#define PERI_GEN_RESET 0
#define OUT_EN_OFFSET(x) ((((x) / 32) * 4) + 0x400)
#define INP_EN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x10)
#define OUT_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x20)
#define INP_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x30)
#define PULLUP_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x40)
#define PULLDOWN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x50)
#define OPENDRAIN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x60)
#define WAKEMASK_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x70)
#define MODE_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x80)
#define INTR_LO_TO_HI_EDGE_CONFIG(x) ((((x) / 32) * 4) + 0x400 + 0x90)
#define INTR_HI_TO_LO_EDGE_CONFIG(x) ((((x) / 32) * 4) + 0x400 + 0xA0)
#define INTR_LEVEL_CONFIG_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xB0)
#define INTR_LEVEL_MASK_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xC0)
#define INTR_STAT_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xD0)
#define DEBOUNCE_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xE0)
#define PIO_GLOBAL_CONFIG_OFFSET (0x400 + 0xF0)
#define PIO_PCI_CTRL_REG_OFFSET (0x400 + 0xF4)
#define INTR_MASK_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x100)
#define INTR_STATUS_OFFSET(x) (((x) * 4) + 0x400 + 0xD0)
struct pci1xxxx_gpio {
struct auxiliary_device *aux_dev;
void __iomem *reg_base;
raw_spinlock_t wa_lock;
struct gpio_chip gpio;
spinlock_t lock;
u32 gpio_wake_mask[3];
int irq_base;
u8 dev_rev;
};
static int pci1xxxx_gpio_get_device_revision(struct pci1xxxx_gpio *priv)
{
struct device *parent = priv->aux_dev->dev.parent;
struct pci_dev *pcidev = to_pci_dev(parent);
int ret;
u32 val;
ret = pci_read_config_dword(pcidev, PCI_DEV_REV_OFFSET, &val);
if (ret)
return ret;
priv->dev_rev = val;
return 0;
}
static int pci1xxxx_gpio_get_direction(struct gpio_chip *gpio, unsigned int nr)
{
struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio);
u32 data;
int ret = -EINVAL;
data = readl(priv->reg_base + INP_EN_OFFSET(nr));
if (data & BIT(nr % 32)) {
ret = 1;
} else {
data = readl(priv->reg_base + OUT_EN_OFFSET(nr));
if (data & BIT(nr % 32))
ret = 0;
}
return ret;
}
static inline void pci1xxx_assign_bit(void __iomem *base_addr, unsigned int reg_offset,
unsigned int bitpos, bool set)
{
u32 data;
data = readl(base_addr + reg_offset);
if (set)
data |= BIT(bitpos);
else
data &= ~BIT(bitpos);
writel(data, base_addr + reg_offset);
}
static int pci1xxxx_gpio_direction_input(struct gpio_chip *gpio, unsigned int nr)
{
struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, INP_EN_OFFSET(nr), (nr % 32), true);
pci1xxx_assign_bit(priv->reg_base, OUT_EN_OFFSET(nr), (nr % 32), false);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static int pci1xxxx_gpio_get(struct gpio_chip *gpio, unsigned int nr)
{
struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio);
return (readl(priv->reg_base + INP_OFFSET(nr)) >> (nr % 32)) & 1;
}
static int pci1xxxx_gpio_direction_output(struct gpio_chip *gpio,
unsigned int nr, int val)
{
struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio);
unsigned long flags;
u32 data;
spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, INP_EN_OFFSET(nr), (nr % 32), false);
pci1xxx_assign_bit(priv->reg_base, OUT_EN_OFFSET(nr), (nr % 32), true);
data = readl(priv->reg_base + OUT_OFFSET(nr));
if (val)
data |= (1 << (nr % 32));
else
data &= ~(1 << (nr % 32));
writel(data, priv->reg_base + OUT_OFFSET(nr));
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static int pci1xxxx_gpio_set(struct gpio_chip *gpio, unsigned int nr, int val)
{
struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, OUT_OFFSET(nr), (nr % 32), val);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static int pci1xxxx_gpio_set_config(struct gpio_chip *gpio, unsigned int offset,
unsigned long config)
{
struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio);
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&priv->lock, flags);
switch (pinconf_to_config_param(config)) {
case PIN_CONFIG_BIAS_PULL_UP:
pci1xxx_assign_bit(priv->reg_base, PULLUP_OFFSET(offset), (offset % 32), true);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
pci1xxx_assign_bit(priv->reg_base, PULLDOWN_OFFSET(offset), (offset % 32), true);
break;
case PIN_CONFIG_BIAS_DISABLE:
pci1xxx_assign_bit(priv->reg_base, PULLUP_OFFSET(offset), (offset % 32), false);
pci1xxx_assign_bit(priv->reg_base, PULLDOWN_OFFSET(offset), (offset % 32), false);
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
pci1xxx_assign_bit(priv->reg_base, OPENDRAIN_OFFSET(offset), (offset % 32), true);
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
pci1xxx_assign_bit(priv->reg_base, OPENDRAIN_OFFSET(offset), (offset % 32), false);
break;
default:
ret = -ENOTSUPP;
break;
}
spin_unlock_irqrestore(&priv->lock, flags);
return ret;
}
static void pci1xxxx_gpio_irq_ack(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct pci1xxxx_gpio *priv = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
writel(BIT(gpio % 32), priv->reg_base + INTR_STAT_OFFSET(gpio));
spin_unlock_irqrestore(&priv->lock, flags);
}
static void pci1xxxx_gpio_irq_set_mask(struct irq_data *data, bool set)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct pci1xxxx_gpio *priv = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
unsigned long flags;
if (!set)
gpiochip_enable_irq(chip, gpio);
spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, INTR_MASK_OFFSET(gpio), (gpio % 32), set);
spin_unlock_irqrestore(&priv->lock, flags);
if (set)
gpiochip_disable_irq(chip, gpio);
}
static void pci1xxxx_gpio_irq_mask(struct irq_data *data)
{
pci1xxxx_gpio_irq_set_mask(data, true);
}
static void pci1xxxx_gpio_irq_unmask(struct irq_data *data)
{
pci1xxxx_gpio_irq_set_mask(data, false);
}
static int pci1xxxx_gpio_set_type(struct irq_data *data, unsigned int trigger_type)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct pci1xxxx_gpio *priv = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
unsigned int bitpos = gpio % 32;
if (trigger_type & IRQ_TYPE_EDGE_FALLING) {
pci1xxx_assign_bit(priv->reg_base, INTR_HI_TO_LO_EDGE_CONFIG(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio),
bitpos, false);
irq_set_handler_locked(data, handle_edge_irq);
} else {
pci1xxx_assign_bit(priv->reg_base, INTR_HI_TO_LO_EDGE_CONFIG(gpio),
bitpos, true);
}
if (trigger_type & IRQ_TYPE_EDGE_RISING) {
pci1xxx_assign_bit(priv->reg_base, INTR_LO_TO_HI_EDGE_CONFIG(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), bitpos,
false);
irq_set_handler_locked(data, handle_edge_irq);
} else {
pci1xxx_assign_bit(priv->reg_base, INTR_LO_TO_HI_EDGE_CONFIG(gpio),
bitpos, true);
}
if (trigger_type & IRQ_TYPE_LEVEL_LOW) {
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_CONFIG_OFFSET(gpio),
bitpos, true);
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_MASK_OFFSET(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), bitpos,
true);
irq_set_handler_locked(data, handle_edge_irq);
}
if (trigger_type & IRQ_TYPE_LEVEL_HIGH) {
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_CONFIG_OFFSET(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_MASK_OFFSET(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), bitpos,
true);
irq_set_handler_locked(data, handle_edge_irq);
}
if ((!(trigger_type & IRQ_TYPE_LEVEL_LOW)) && (!(trigger_type & IRQ_TYPE_LEVEL_HIGH)))
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_MASK_OFFSET(gpio), bitpos, true);
return true;
}
static int pci1xxxx_gpio_set_wake(struct irq_data *data, unsigned int enable)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct pci1xxxx_gpio *priv = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
unsigned int bitpos = gpio % 32;
unsigned int bank = gpio / 32;
if (enable)
priv->gpio_wake_mask[bank] |= (1 << bitpos);
else
priv->gpio_wake_mask[bank] &= ~(1 << bitpos);
return 0;
}
static irqreturn_t pci1xxxx_gpio_irq_handler(int irq, void *dev_id)
{
struct pci1xxxx_gpio *priv = dev_id;
struct gpio_chip *gc = &priv->gpio;
unsigned long int_status = 0;
unsigned long wa_flags;
unsigned long flags;
u8 pincount;
int bit;
u8 gpiobank;
spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 16, true);
spin_unlock_irqrestore(&priv->lock, flags);
for (gpiobank = 0; gpiobank < 3; gpiobank++) {
spin_lock_irqsave(&priv->lock, flags);
int_status = readl(priv->reg_base + INTR_STATUS_OFFSET(gpiobank));
spin_unlock_irqrestore(&priv->lock, flags);
if (gpiobank == 2)
pincount = 29;
else
pincount = 32;
for_each_set_bit(bit, &int_status, pincount) {
unsigned int irq;
spin_lock_irqsave(&priv->lock, flags);
writel(BIT(bit), priv->reg_base + INTR_STATUS_OFFSET(gpiobank));
spin_unlock_irqrestore(&priv->lock, flags);
irq = irq_find_mapping(gc->irq.domain, (bit + (gpiobank * 32)));
raw_spin_lock_irqsave(&priv->wa_lock, wa_flags);
generic_handle_irq(irq);
raw_spin_unlock_irqrestore(&priv->wa_lock, wa_flags);
}
}
spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 16, false);
spin_unlock_irqrestore(&priv->lock, flags);
return IRQ_HANDLED;
}
static const struct irq_chip pci1xxxx_gpio_irqchip = {
.name = "pci1xxxx_gpio",
.irq_ack = pci1xxxx_gpio_irq_ack,
.irq_mask = pci1xxxx_gpio_irq_mask,
.irq_unmask = pci1xxxx_gpio_irq_unmask,
.irq_set_type = pci1xxxx_gpio_set_type,
.irq_set_wake = pci1xxxx_gpio_set_wake,
.flags = IRQCHIP_IMMUTABLE,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static int pci1xxxx_gpio_suspend(struct device *dev)
{
struct pci1xxxx_gpio *priv = dev_get_drvdata(dev);
struct device *parent = priv->aux_dev->dev.parent;
struct pci_dev *pcidev = to_pci_dev(parent);
unsigned int gpio_bank_base;
unsigned int wake_mask;
unsigned int gpiobank;
unsigned long flags;
for (gpiobank = 0; gpiobank < 3; gpiobank++) {
wake_mask = priv->gpio_wake_mask[gpiobank];
if (wake_mask) {
gpio_bank_base = gpiobank * 32;
pci1xxx_assign_bit(priv->reg_base,
PIO_PCI_CTRL_REG_OFFSET, 0, true);
writel(~wake_mask, priv->reg_base +
WAKEMASK_OFFSET(gpio_bank_base));
}
}
spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET,
16, true);
pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET,
17, false);
pci1xxx_assign_bit(priv->reg_base, PERI_GEN_RESET, 16, true);
if (priv->dev_rev >= 0xC0)
pci1xxx_assign_bit(priv->reg_base, PERI_GEN_RESET, 17, true);
spin_unlock_irqrestore(&priv->lock, flags);
device_set_wakeup_enable(&pcidev->dev, true);
pci_wake_from_d3(pcidev, true);
return 0;
}
static int pci1xxxx_gpio_resume(struct device *dev)
{
struct pci1xxxx_gpio *priv = dev_get_drvdata(dev);
struct device *parent = priv->aux_dev->dev.parent;
struct pci_dev *pcidev = to_pci_dev(parent);
unsigned int gpio_bank_base;
unsigned int wake_mask;
unsigned int gpiobank;
unsigned long flags;
for (gpiobank = 0; gpiobank < 3; gpiobank++) {
wake_mask = priv->gpio_wake_mask[gpiobank];
if (wake_mask) {
gpio_bank_base = gpiobank * 32;
writel(wake_mask, priv->reg_base +
INTR_STAT_OFFSET(gpio_bank_base));
pci1xxx_assign_bit(priv->reg_base,
PIO_PCI_CTRL_REG_OFFSET, 0, false);
writel(0xffffffff, priv->reg_base +
WAKEMASK_OFFSET(gpio_bank_base));
}
}
spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET,
17, true);
pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET,
16, false);
pci1xxx_assign_bit(priv->reg_base, PERI_GEN_RESET, 16, false);
if (priv->dev_rev >= 0xC0)
pci1xxx_assign_bit(priv->reg_base, PERI_GEN_RESET, 17, false);
spin_unlock_irqrestore(&priv->lock, flags);
pci_wake_from_d3(pcidev, false);
return 0;
}
static int pci1xxxx_gpio_setup(struct pci1xxxx_gpio *priv, int irq)
{
struct gpio_chip *gchip = &priv->gpio;
struct gpio_irq_chip *girq;
int retval;
gchip->label = dev_name(&priv->aux_dev->dev);
gchip->parent = &priv->aux_dev->dev;
gchip->owner = THIS_MODULE;
gchip->direction_input = pci1xxxx_gpio_direction_input;
gchip->direction_output = pci1xxxx_gpio_direction_output;
gchip->get_direction = pci1xxxx_gpio_get_direction;
gchip->get = pci1xxxx_gpio_get;
gchip->set = pci1xxxx_gpio_set;
gchip->set_config = pci1xxxx_gpio_set_config;
gchip->dbg_show = NULL;
gchip->base = -1;
gchip->ngpio = PCI1XXXX_NR_PINS;
gchip->can_sleep = false;
retval = devm_request_threaded_irq(&priv->aux_dev->dev, irq,
NULL, pci1xxxx_gpio_irq_handler,
IRQF_ONESHOT, "PCI1xxxxGPIO", priv);
if (retval)
return retval;
girq = &priv->gpio.irq;
gpio_irq_chip_set_chip(girq, &pci1xxxx_gpio_irqchip);
girq->parent_handler = NULL;
girq->num_parents = 0;
girq->parents = NULL;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_bad_irq;
return 0;
}
static int pci1xxxx_gpio_probe(struct auxiliary_device *aux_dev,
const struct auxiliary_device_id *id)
{
struct auxiliary_device_wrapper *aux_dev_wrapper;
struct gp_aux_data_type *pdata;
struct pci1xxxx_gpio *priv;
int retval;
aux_dev_wrapper = (struct auxiliary_device_wrapper *)
container_of(aux_dev, struct auxiliary_device_wrapper, aux_dev);
pdata = &aux_dev_wrapper->gp_aux_data;
if (!pdata)
return -EINVAL;
priv = devm_kzalloc(&aux_dev->dev, sizeof(struct pci1xxxx_gpio), GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->lock);
priv->aux_dev = aux_dev;
if (!devm_request_mem_region(&aux_dev->dev, pdata->region_start, 0x800, aux_dev->name))
return -EBUSY;
priv->reg_base = devm_ioremap(&aux_dev->dev, pdata->region_start, 0x800);
if (!priv->reg_base)
return -ENOMEM;
writel(0x0264, (priv->reg_base + 0x400 + 0xF0));
retval = pci1xxxx_gpio_setup(priv, pdata->irq_num);
if (retval < 0)
return retval;
retval = pci1xxxx_gpio_get_device_revision(priv);
if (retval)
return retval;
dev_set_drvdata(&aux_dev->dev, priv);
return devm_gpiochip_add_data(&aux_dev->dev, &priv->gpio, priv);
}
static DEFINE_SIMPLE_DEV_PM_OPS(pci1xxxx_gpio_pm_ops, pci1xxxx_gpio_suspend, pci1xxxx_gpio_resume);
static const struct auxiliary_device_id pci1xxxx_gpio_auxiliary_id_table[] = {
{.name = "mchp_pci1xxxx_gp.gp_gpio"},
{}
};
MODULE_DEVICE_TABLE(auxiliary, pci1xxxx_gpio_auxiliary_id_table);
static struct auxiliary_driver pci1xxxx_gpio_driver = {
.driver = {
.name = "PCI1xxxxGPIO",
.pm = &pci1xxxx_gpio_pm_ops,
},
.probe = pci1xxxx_gpio_probe,
.id_table = pci1xxxx_gpio_auxiliary_id_table
};
module_auxiliary_driver(pci1xxxx_gpio_driver);
MODULE_DESCRIPTION("Microchip Technology Inc. PCI1xxxx GPIO controller");
MODULE_AUTHOR("Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>");
MODULE_LICENSE("GPL");
