Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 427 insertions, 0 deletions

diff --git a/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c
new file mode 100644
index 000000000..3389803cb
--- /dev/null
+++ b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c
@@ -0,0 +1,427 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2022 Microchip Technology Inc.
+// pci1xxxx gpio driver
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/gpio/driver.h>
+#include <linux/bio.h>
+#include <linux/mutex.h>
+#include <linux/kthread.h>
+#include <linux/interrupt.h>
+
+#include "mchp_pci1xxxx_gp.h"
+
+#define PCI1XXXX_NR_PINS		93
+#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;
+	struct gpio_chip gpio;
+	spinlock_t lock;
+	int irq_base;
+};
+
+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 void 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);
+}
+
+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;
+	default:
+		ret = -EOPNOTSUPP;
+		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);
+	pci1xxx_assign_bit(priv->reg_base, INTR_STAT_OFFSET(gpio), (gpio % 32), true);
+	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;
+
+	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);
+}
+
+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 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 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)));
+			generic_handle_irq(irq);
+		}
+	}
+	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 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,
+};
+
+static int pci1xxxx_gpio_suspend(struct device *dev)
+{
+	struct pci1xxxx_gpio *priv = dev_get_drvdata(dev);
+	unsigned long flags;
+
+	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);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static int pci1xxxx_gpio_resume(struct device *dev)
+{
+	struct pci1xxxx_gpio *priv = dev_get_drvdata(dev);
+	unsigned long flags;
+
+	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);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	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;
+	girq->chip = &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;
+
+	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");