1 files changed, 453 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c
new file mode 100644
index 000000000..ee37ecb61
--- /dev/null
+++ b/drivers/gpio/gpio-pch.c
@@ -0,0 +1,453 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
+ */
+#include <linux/bits.h>
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+
+#define PCH_EDGE_FALLING	0
+#define PCH_EDGE_RISING		1
+#define PCH_LEVEL_L		2
+#define PCH_LEVEL_H		3
+#define PCH_EDGE_BOTH		4
+#define PCH_IM_MASK		GENMASK(2, 0)
+
+#define PCH_IRQ_BASE		24
+
+struct pch_regs {
+	u32	ien;
+	u32	istatus;
+	u32	idisp;
+	u32	iclr;
+	u32	imask;
+	u32	imaskclr;
+	u32	po;
+	u32	pi;
+	u32	pm;
+	u32	im0;
+	u32	im1;
+	u32	reserved[3];
+	u32	gpio_use_sel;
+	u32	reset;
+};
+
+#define PCI_DEVICE_ID_INTEL_EG20T_PCH		0x8803
+#define PCI_DEVICE_ID_ROHM_ML7223m_IOH		0x8014
+#define PCI_DEVICE_ID_ROHM_ML7223n_IOH		0x8043
+#define PCI_DEVICE_ID_ROHM_EG20T_PCH		0x8803
+
+enum pch_type_t {
+	INTEL_EG20T_PCH,
+	OKISEMI_ML7223m_IOH, /* LAPIS Semiconductor ML7223 IOH PCIe Bus-m */
+	OKISEMI_ML7223n_IOH  /* LAPIS Semiconductor ML7223 IOH PCIe Bus-n */
+};
+
+/* Specifies number of GPIO PINS */
+static int gpio_pins[] = {
+	[INTEL_EG20T_PCH] = 12,
+	[OKISEMI_ML7223m_IOH] = 8,
+	[OKISEMI_ML7223n_IOH] = 8,
+};
+
+/**
+ * struct pch_gpio_reg_data - The register store data.
+ * @ien_reg:	To store contents of IEN register.
+ * @imask_reg:	To store contents of IMASK register.
+ * @po_reg:	To store contents of PO register.
+ * @pm_reg:	To store contents of PM register.
+ * @im0_reg:	To store contents of IM0 register.
+ * @im1_reg:	To store contents of IM1 register.
+ * @gpio_use_sel_reg : To store contents of GPIO_USE_SEL register.
+ *		       (Only ML7223 Bus-n)
+ */
+struct pch_gpio_reg_data {
+	u32 ien_reg;
+	u32 imask_reg;
+	u32 po_reg;
+	u32 pm_reg;
+	u32 im0_reg;
+	u32 im1_reg;
+	u32 gpio_use_sel_reg;
+};
+
+/**
+ * struct pch_gpio - GPIO private data structure.
+ * @base:			PCI base address of Memory mapped I/O register.
+ * @reg:			Memory mapped PCH GPIO register list.
+ * @dev:			Pointer to device structure.
+ * @gpio:			Data for GPIO infrastructure.
+ * @pch_gpio_reg:		Memory mapped Register data is saved here
+ *				when suspend.
+ * @lock:			Used for register access protection
+ * @irq_base:		Save base of IRQ number for interrupt
+ * @ioh:		IOH ID
+ * @spinlock:		Used for register access protection
+ */
+struct pch_gpio {
+	void __iomem *base;
+	struct pch_regs __iomem *reg;
+	struct device *dev;
+	struct gpio_chip gpio;
+	struct pch_gpio_reg_data pch_gpio_reg;
+	int irq_base;
+	enum pch_type_t ioh;
+	spinlock_t spinlock;
+};
+
+static void pch_gpio_set(struct gpio_chip *gpio, unsigned int nr, int val)
+{
+	u32 reg_val;
+	struct pch_gpio *chip =	gpiochip_get_data(gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->spinlock, flags);
+	reg_val = ioread32(&chip->reg->po);
+	if (val)
+		reg_val |= BIT(nr);
+	else
+		reg_val &= ~BIT(nr);
+
+	iowrite32(reg_val, &chip->reg->po);
+	spin_unlock_irqrestore(&chip->spinlock, flags);
+}
+
+static int pch_gpio_get(struct gpio_chip *gpio, unsigned int nr)
+{
+	struct pch_gpio *chip =	gpiochip_get_data(gpio);
+
+	return !!(ioread32(&chip->reg->pi) & BIT(nr));
+}
+
+static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned int nr,
+				     int val)
+{
+	struct pch_gpio *chip =	gpiochip_get_data(gpio);
+	u32 pm;
+	u32 reg_val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->spinlock, flags);
+
+	reg_val = ioread32(&chip->reg->po);
+	if (val)
+		reg_val |= BIT(nr);
+	else
+		reg_val &= ~BIT(nr);
+	iowrite32(reg_val, &chip->reg->po);
+
+	pm = ioread32(&chip->reg->pm);
+	pm &= BIT(gpio_pins[chip->ioh]) - 1;
+	pm |= BIT(nr);
+	iowrite32(pm, &chip->reg->pm);
+
+	spin_unlock_irqrestore(&chip->spinlock, flags);
+
+	return 0;
+}
+
+static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned int nr)
+{
+	struct pch_gpio *chip =	gpiochip_get_data(gpio);
+	u32 pm;
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->spinlock, flags);
+	pm = ioread32(&chip->reg->pm);
+	pm &= BIT(gpio_pins[chip->ioh]) - 1;
+	pm &= ~BIT(nr);
+	iowrite32(pm, &chip->reg->pm);
+	spin_unlock_irqrestore(&chip->spinlock, flags);
+
+	return 0;
+}
+
+/*
+ * Save register configuration and disable interrupts.
+ */
+static void __maybe_unused pch_gpio_save_reg_conf(struct pch_gpio *chip)
+{
+	chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien);
+	chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask);
+	chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
+	chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
+	chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0);
+	if (chip->ioh == INTEL_EG20T_PCH)
+		chip->pch_gpio_reg.im1_reg = ioread32(&chip->reg->im1);
+	if (chip->ioh == OKISEMI_ML7223n_IOH)
+		chip->pch_gpio_reg.gpio_use_sel_reg = ioread32(&chip->reg->gpio_use_sel);
+}
+
+/*
+ * This function restores the register configuration of the GPIO device.
+ */
+static void __maybe_unused pch_gpio_restore_reg_conf(struct pch_gpio *chip)
+{
+	iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien);
+	iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask);
+	/* to store contents of PO register */
+	iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
+	/* to store contents of PM register */
+	iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
+	iowrite32(chip->pch_gpio_reg.im0_reg, &chip->reg->im0);
+	if (chip->ioh == INTEL_EG20T_PCH)
+		iowrite32(chip->pch_gpio_reg.im1_reg, &chip->reg->im1);
+	if (chip->ioh == OKISEMI_ML7223n_IOH)
+		iowrite32(chip->pch_gpio_reg.gpio_use_sel_reg, &chip->reg->gpio_use_sel);
+}
+
+static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned int offset)
+{
+	struct pch_gpio *chip = gpiochip_get_data(gpio);
+
+	return chip->irq_base + offset;
+}
+
+static void pch_gpio_setup(struct pch_gpio *chip)
+{
+	struct gpio_chip *gpio = &chip->gpio;
+
+	gpio->label = dev_name(chip->dev);
+	gpio->parent = chip->dev;
+	gpio->owner = THIS_MODULE;
+	gpio->direction_input = pch_gpio_direction_input;
+	gpio->get = pch_gpio_get;
+	gpio->direction_output = pch_gpio_direction_output;
+	gpio->set = pch_gpio_set;
+	gpio->base = -1;
+	gpio->ngpio = gpio_pins[chip->ioh];
+	gpio->can_sleep = false;
+	gpio->to_irq = pch_gpio_to_irq;
+}
+
+static int pch_irq_type(struct irq_data *d, unsigned int type)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct pch_gpio *chip = gc->private;
+	u32 im, im_pos, val;
+	u32 __iomem *im_reg;
+	unsigned long flags;
+	int ch, irq = d->irq;
+
+	ch = irq - chip->irq_base;
+	if (irq < chip->irq_base + 8) {
+		im_reg = &chip->reg->im0;
+		im_pos = ch - 0;
+	} else {
+		im_reg = &chip->reg->im1;
+		im_pos = ch - 8;
+	}
+	dev_dbg(chip->dev, "irq=%d type=%d ch=%d pos=%d\n", irq, type, ch, im_pos);
+
+	switch (type) {
+	case IRQ_TYPE_EDGE_RISING:
+		val = PCH_EDGE_RISING;
+		break;
+	case IRQ_TYPE_EDGE_FALLING:
+		val = PCH_EDGE_FALLING;
+		break;
+	case IRQ_TYPE_EDGE_BOTH:
+		val = PCH_EDGE_BOTH;
+		break;
+	case IRQ_TYPE_LEVEL_HIGH:
+		val = PCH_LEVEL_H;
+		break;
+	case IRQ_TYPE_LEVEL_LOW:
+		val = PCH_LEVEL_L;
+		break;
+	default:
+		return 0;
+	}
+
+	spin_lock_irqsave(&chip->spinlock, flags);
+
+	/* Set interrupt mode */
+	im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4));
+	iowrite32(im | (val << (im_pos * 4)), im_reg);
+
+	/* And the handler */
+	if (type & IRQ_TYPE_LEVEL_MASK)
+		irq_set_handler_locked(d, handle_level_irq);
+	else if (type & IRQ_TYPE_EDGE_BOTH)
+		irq_set_handler_locked(d, handle_edge_irq);
+
+	spin_unlock_irqrestore(&chip->spinlock, flags);
+	return 0;
+}
+
+static void pch_irq_unmask(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct pch_gpio *chip = gc->private;
+
+	iowrite32(BIT(d->irq - chip->irq_base), &chip->reg->imaskclr);
+}
+
+static void pch_irq_mask(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct pch_gpio *chip = gc->private;
+
+	iowrite32(BIT(d->irq - chip->irq_base), &chip->reg->imask);
+}
+
+static void pch_irq_ack(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct pch_gpio *chip = gc->private;
+
+	iowrite32(BIT(d->irq - chip->irq_base), &chip->reg->iclr);
+}
+
+static irqreturn_t pch_gpio_handler(int irq, void *dev_id)
+{
+	struct pch_gpio *chip = dev_id;
+	unsigned long reg_val = ioread32(&chip->reg->istatus);
+	int i;
+
+	dev_vdbg(chip->dev, "irq=%d  status=0x%lx\n", irq, reg_val);
+
+	reg_val &= BIT(gpio_pins[chip->ioh]) - 1;
+
+	for_each_set_bit(i, &reg_val, gpio_pins[chip->ioh])
+		generic_handle_irq(chip->irq_base + i);
+
+	return IRQ_RETVAL(reg_val);
+}
+
+static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
+				       unsigned int irq_start,
+				       unsigned int num)
+{
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
+	int rv;
+
+	gc = devm_irq_alloc_generic_chip(chip->dev, "pch_gpio", 1, irq_start,
+					 chip->base, handle_simple_irq);
+	if (!gc)
+		return -ENOMEM;
+
+	gc->private = chip;
+	ct = gc->chip_types;
+
+	ct->chip.irq_ack = pch_irq_ack;
+	ct->chip.irq_mask = pch_irq_mask;
+	ct->chip.irq_unmask = pch_irq_unmask;
+	ct->chip.irq_set_type = pch_irq_type;
+
+	rv = devm_irq_setup_generic_chip(chip->dev, gc, IRQ_MSK(num),
+					 IRQ_GC_INIT_MASK_CACHE,
+					 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
+
+	return rv;
+}
+
+static int pch_gpio_probe(struct pci_dev *pdev,
+				    const struct pci_device_id *id)
+{
+	struct device *dev = &pdev->dev;
+	s32 ret;
+	struct pch_gpio *chip;
+	int irq_base;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (chip == NULL)
+		return -ENOMEM;
+
+	chip->dev = dev;
+	ret = pcim_enable_device(pdev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to enable PCI device\n");
+
+	ret = pcim_iomap_regions(pdev, BIT(1), KBUILD_MODNAME);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to request and map PCI regions\n");
+
+	chip->base = pcim_iomap_table(pdev)[1];
+	chip->ioh = id->driver_data;
+	chip->reg = chip->base;
+	pci_set_drvdata(pdev, chip);
+	spin_lock_init(&chip->spinlock);
+	pch_gpio_setup(chip);
+
+	ret = devm_gpiochip_add_data(dev, &chip->gpio, chip);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to register GPIO\n");
+
+	irq_base = devm_irq_alloc_descs(dev, -1, 0,
+					gpio_pins[chip->ioh], NUMA_NO_NODE);
+	if (irq_base < 0) {
+		dev_warn(dev, "PCH gpio: Failed to get IRQ base num\n");
+		chip->irq_base = -1;
+		return 0;
+	}
+	chip->irq_base = irq_base;
+
+	/* Mask all interrupts, but enable them */
+	iowrite32(BIT(gpio_pins[chip->ioh]) - 1, &chip->reg->imask);
+	iowrite32(BIT(gpio_pins[chip->ioh]) - 1, &chip->reg->ien);
+
+	ret = devm_request_irq(dev, pdev->irq, pch_gpio_handler,
+			       IRQF_SHARED, KBUILD_MODNAME, chip);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to request IRQ\n");
+
+	return pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]);
+}
+
+static int __maybe_unused pch_gpio_suspend(struct device *dev)
+{
+	struct pch_gpio *chip = dev_get_drvdata(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->spinlock, flags);
+	pch_gpio_save_reg_conf(chip);
+	spin_unlock_irqrestore(&chip->spinlock, flags);
+
+	return 0;
+}
+
+static int __maybe_unused pch_gpio_resume(struct device *dev)
+{
+	struct pch_gpio *chip = dev_get_drvdata(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->spinlock, flags);
+	iowrite32(0x01, &chip->reg->reset);
+	iowrite32(0x00, &chip->reg->reset);
+	pch_gpio_restore_reg_conf(chip);
+	spin_unlock_irqrestore(&chip->spinlock, flags);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(pch_gpio_pm_ops, pch_gpio_suspend, pch_gpio_resume);
+
+static const struct pci_device_id pch_gpio_pcidev_id[] = {
+	{ PCI_DEVICE_DATA(INTEL, EG20T_PCH, INTEL_EG20T_PCH) },
+	{ PCI_DEVICE_DATA(ROHM, ML7223m_IOH, OKISEMI_ML7223m_IOH) },
+	{ PCI_DEVICE_DATA(ROHM, ML7223n_IOH, OKISEMI_ML7223n_IOH) },
+	{ PCI_DEVICE_DATA(ROHM, EG20T_PCH, INTEL_EG20T_PCH) },
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);
+
+static struct pci_driver pch_gpio_driver = {
+	.name = "pch_gpio",
+	.id_table = pch_gpio_pcidev_id,
+	.probe = pch_gpio_probe,
+	.driver = {
+		.pm = &pch_gpio_pm_ops,
+	},
+};
+
+module_pci_driver(pch_gpio_driver);
+
+MODULE_DESCRIPTION("PCH GPIO PCI Driver");
+MODULE_LICENSE("GPL v2");