drivers/gpio/gpio-sodaville.c - kernel/msm-4.9 - Gitiles

 /*
  *  GPIO interface for Intel Sodaville SoCs.
  *
  *  Copyright (c) 2010, 2011 Intel Corporation
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License 2 as published
  *  by the Free Software Foundation.
  *
  */

 #include <linux/errno.h>
 #include <linux/gpio.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/of_irq.h>
 #include <linux/basic_mmio_gpio.h>

 #define DRV_NAME		"sdv_gpio"
 #define SDV_NUM_PUB_GPIOS	12
 #define PCI_DEVICE_ID_SDV_GPIO	0x2e67
 #define GPIO_BAR		0

 #define GPOUTR		0x00
 #define GPOER		0x04
 #define GPINR		0x08

 #define GPSTR		0x0c
 #define GPIT1R0		0x10
 #define GPIO_INT	0x14
 #define GPIT1R1		0x18

 #define GPMUXCTL	0x1c

 struct sdv_gpio_chip_data {
 	int irq_base;
 	void __iomem *gpio_pub_base;
 	struct irq_domain *id;
 	struct irq_chip_generic *gc;
 	struct bgpio_chip bgpio;
 };

 static int sdv_gpio_pub_set_type(struct irq_data *d, unsigned int type)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct sdv_gpio_chip_data *sd = gc->private;
 	void __iomem *type_reg;
 	u32 reg;

 	if (d->hwirq < 8)
 		type_reg = sd->gpio_pub_base + GPIT1R0;
 	else
 		type_reg = sd->gpio_pub_base + GPIT1R1;

 	reg = readl(type_reg);

 	switch (type) {
 	case IRQ_TYPE_LEVEL_HIGH:
 		reg &= ~BIT(4 * (d->hwirq % 8));
 		break;

 	case IRQ_TYPE_LEVEL_LOW:
 		reg |= BIT(4 * (d->hwirq % 8));
 		break;

 	default:
 		return -EINVAL;
 	}

 	writel(reg, type_reg);
 	return 0;
 }

 static irqreturn_t sdv_gpio_pub_irq_handler(int irq, void *data)
 {
 	struct sdv_gpio_chip_data *sd = data;
 	u32 irq_stat = readl(sd->gpio_pub_base + GPSTR);

 	irq_stat &= readl(sd->gpio_pub_base + GPIO_INT);
 	if (!irq_stat)
 		return IRQ_NONE;

 	while (irq_stat) {
 		u32 irq_bit = __fls(irq_stat);

 		irq_stat &= ~BIT(irq_bit);
 		generic_handle_irq(irq_find_mapping(sd->id, irq_bit));
 	}

 	return IRQ_HANDLED;
 }

 static int sdv_xlate(struct irq_domain *h, struct device_node *node,
 		const u32 *intspec, u32 intsize, irq_hw_number_t *out_hwirq,
 		u32 *out_type)
 {
 	u32 line, type;

 	if (node != h->of_node)
 		return -EINVAL;

 	if (intsize < 2)
 		return -EINVAL;

 	line = *intspec;
 	*out_hwirq = line;

 	intspec++;
 	type = *intspec;

 	switch (type) {
 	case IRQ_TYPE_LEVEL_LOW:
 	case IRQ_TYPE_LEVEL_HIGH:
 		*out_type = type;
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static struct irq_domain_ops irq_domain_sdv_ops = {
 	.xlate = sdv_xlate,
 };

 static int sdv_register_irqsupport(struct sdv_gpio_chip_data *sd,
 		struct pci_dev *pdev)
 {
 	struct irq_chip_type *ct;
 	int ret;

 	sd->irq_base = irq_alloc_descs(-1, 0, SDV_NUM_PUB_GPIOS, -1);
 	if (sd->irq_base < 0)
 		return sd->irq_base;

 	/* mask + ACK all interrupt sources */
 	writel(0, sd->gpio_pub_base + GPIO_INT);
 	writel((1 << 11) - 1, sd->gpio_pub_base + GPSTR);

 	ret = request_irq(pdev->irq, sdv_gpio_pub_irq_handler, IRQF_SHARED,
 			"sdv_gpio", sd);
 	if (ret)
 		goto out_free_desc;

 	/*
 	 * This gpio irq controller latches level irqs. Testing shows that if
 	 * we unmask & ACK the IRQ before the source of the interrupt is gone
 	 * then the interrupt is active again.
 	 */
 	sd->gc = irq_alloc_generic_chip("sdv-gpio", 1, sd->irq_base,
 			sd->gpio_pub_base, handle_fasteoi_irq);
 	if (!sd->gc) {
 		ret = -ENOMEM;
 		goto out_free_irq;
 	}

 	sd->gc->private = sd;
 	ct = sd->gc->chip_types;
 	ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
 	ct->regs.eoi = GPSTR;
 	ct->regs.mask = GPIO_INT;
 	ct->chip.irq_mask = irq_gc_mask_clr_bit;
 	ct->chip.irq_unmask = irq_gc_mask_set_bit;
 	ct->chip.irq_eoi = irq_gc_eoi;
 	ct->chip.irq_set_type = sdv_gpio_pub_set_type;

 	irq_setup_generic_chip(sd->gc, IRQ_MSK(SDV_NUM_PUB_GPIOS),
 			IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST,
 			IRQ_LEVEL | IRQ_NOPROBE);

 	sd->id = irq_domain_add_legacy(pdev->dev.of_node, SDV_NUM_PUB_GPIOS,
 				sd->irq_base, 0, &irq_domain_sdv_ops, sd);
 	if (!sd->id) {
 		ret = -ENODEV;
 		goto out_free_irq;
 	}
 	return 0;
 out_free_irq:
 	free_irq(pdev->irq, sd);
 out_free_desc:
 	irq_free_descs(sd->irq_base, SDV_NUM_PUB_GPIOS);
 	return ret;
 }

 static int sdv_gpio_probe(struct pci_dev *pdev,
 					const struct pci_device_id *pci_id)
 {
 	struct sdv_gpio_chip_data *sd;
 	unsigned long addr;
 	const void *prop;
 	int len;
 	int ret;
 	u32 mux_val;

 	sd = kzalloc(sizeof(struct sdv_gpio_chip_data), GFP_KERNEL);
 	if (!sd)
 		return -ENOMEM;
 	ret = pci_enable_device(pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "can't enable device.\n");
 		goto done;
 	}

 	ret = pci_request_region(pdev, GPIO_BAR, DRV_NAME);
 	if (ret) {
 		dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", GPIO_BAR);
 		goto disable_pci;
 	}

 	addr = pci_resource_start(pdev, GPIO_BAR);
 	if (!addr) {
 		ret = -ENODEV;
 		goto release_reg;
 	}
 	sd->gpio_pub_base = ioremap(addr, pci_resource_len(pdev, GPIO_BAR));

 	prop = of_get_property(pdev->dev.of_node, "intel,muxctl", &len);
 	if (prop && len == 4) {
 		mux_val = of_read_number(prop, 1);
 		writel(mux_val, sd->gpio_pub_base + GPMUXCTL);
 	}

 	ret = bgpio_init(&sd->bgpio, &pdev->dev, 4,
 			sd->gpio_pub_base + GPINR, sd->gpio_pub_base + GPOUTR,
 			NULL, sd->gpio_pub_base + GPOER, NULL, 0);
 	if (ret)
 		goto unmap;
 	sd->bgpio.gc.ngpio = SDV_NUM_PUB_GPIOS;

 	ret = gpiochip_add(&sd->bgpio.gc);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "gpiochip_add() failed.\n");
 		goto unmap;
 	}

 	ret = sdv_register_irqsupport(sd, pdev);
 	if (ret)
 		goto unmap;

 	pci_set_drvdata(pdev, sd);
 	dev_info(&pdev->dev, "Sodaville GPIO driver registered.\n");
 	return 0;

 unmap:
 	iounmap(sd->gpio_pub_base);
 release_reg:
 	pci_release_region(pdev, GPIO_BAR);
 disable_pci:
 	pci_disable_device(pdev);
 done:
 	kfree(sd);
 	return ret;
 }

 static void sdv_gpio_remove(struct pci_dev *pdev)
 {
 	struct sdv_gpio_chip_data *sd = pci_get_drvdata(pdev);

 	free_irq(pdev->irq, sd);
 	irq_free_descs(sd->irq_base, SDV_NUM_PUB_GPIOS);

 	gpiochip_remove(&sd->bgpio.gc);
 	pci_release_region(pdev, GPIO_BAR);
 	iounmap(sd->gpio_pub_base);
 	pci_disable_device(pdev);
 	kfree(sd);
 }

 static const struct pci_device_id sdv_gpio_pci_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_SDV_GPIO) },
 	{ 0, },
 };

 static struct pci_driver sdv_gpio_driver = {
 	.name = DRV_NAME,
 	.id_table = sdv_gpio_pci_ids,
 	.probe = sdv_gpio_probe,
 	.remove = sdv_gpio_remove,
 };

 module_pci_driver(sdv_gpio_driver);

 MODULE_AUTHOR("Hans J. Koch <hjk@linutronix.de>");
 MODULE_DESCRIPTION("GPIO interface for Intel Sodaville SoCs");
 MODULE_LICENSE("GPL v2");
	/*
	* GPIO interface for Intel Sodaville SoCs.
	*
	* Copyright (c) 2010, 2011 Intel Corporation
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License 2 as published
	* by the Free Software Foundation.
	*
	*/

	#include <linux/errno.h>
	#include <linux/gpio.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/platform_device.h>
	#include <linux/of_irq.h>
	#include <linux/basic_mmio_gpio.h>

	#define DRV_NAME "sdv_gpio"
	#define SDV_NUM_PUB_GPIOS 12
	#define PCI_DEVICE_ID_SDV_GPIO 0x2e67
	#define GPIO_BAR 0

	#define GPOUTR 0x00
	#define GPOER 0x04
	#define GPINR 0x08

	#define GPSTR 0x0c
	#define GPIT1R0 0x10
	#define GPIO_INT 0x14
	#define GPIT1R1 0x18

	#define GPMUXCTL 0x1c

	struct sdv_gpio_chip_data {
	int irq_base;
	void __iomem *gpio_pub_base;
	struct irq_domain *id;
	struct irq_chip_generic *gc;
	struct bgpio_chip bgpio;
	};

	static int sdv_gpio_pub_set_type(struct irq_data *d, unsigned int type)
	{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct sdv_gpio_chip_data *sd = gc->private;
	void __iomem *type_reg;
	u32 reg;

	if (d->hwirq < 8)
	type_reg = sd->gpio_pub_base + GPIT1R0;
	else
	type_reg = sd->gpio_pub_base + GPIT1R1;

	reg = readl(type_reg);

	switch (type) {
	case IRQ_TYPE_LEVEL_HIGH:
	reg &= ~BIT(4 * (d->hwirq % 8));
	break;

	case IRQ_TYPE_LEVEL_LOW:
	reg \|= BIT(4 * (d->hwirq % 8));
	break;

	default:
	return -EINVAL;
	}

	writel(reg, type_reg);
	return 0;
	}

	static irqreturn_t sdv_gpio_pub_irq_handler(int irq, void *data)
	{
	struct sdv_gpio_chip_data *sd = data;
	u32 irq_stat = readl(sd->gpio_pub_base + GPSTR);

	irq_stat &= readl(sd->gpio_pub_base + GPIO_INT);
	if (!irq_stat)
	return IRQ_NONE;

	while (irq_stat) {
	u32 irq_bit = __fls(irq_stat);

	irq_stat &= ~BIT(irq_bit);
	generic_handle_irq(irq_find_mapping(sd->id, irq_bit));
	}

	return IRQ_HANDLED;
	}

	static int sdv_xlate(struct irq_domain h, struct device_node node,
	const u32 intspec, u32 intsize, irq_hw_number_t out_hwirq,
	u32 *out_type)
	{
	u32 line, type;

	if (node != h->of_node)
	return -EINVAL;

	if (intsize < 2)
	return -EINVAL;

	line = *intspec;
	*out_hwirq = line;

	intspec++;
	type = *intspec;

	switch (type) {
	case IRQ_TYPE_LEVEL_LOW:
	case IRQ_TYPE_LEVEL_HIGH:
	*out_type = type;
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static struct irq_domain_ops irq_domain_sdv_ops = {
	.xlate = sdv_xlate,
	};

	static int sdv_register_irqsupport(struct sdv_gpio_chip_data *sd,
	struct pci_dev *pdev)
	{
	struct irq_chip_type *ct;
	int ret;

	sd->irq_base = irq_alloc_descs(-1, 0, SDV_NUM_PUB_GPIOS, -1);
	if (sd->irq_base < 0)
	return sd->irq_base;

	/* mask + ACK all interrupt sources */
	writel(0, sd->gpio_pub_base + GPIO_INT);
	writel((1 << 11) - 1, sd->gpio_pub_base + GPSTR);

	ret = request_irq(pdev->irq, sdv_gpio_pub_irq_handler, IRQF_SHARED,
	"sdv_gpio", sd);
	if (ret)
	goto out_free_desc;

	/*
	* This gpio irq controller latches level irqs. Testing shows that if
	* we unmask & ACK the IRQ before the source of the interrupt is gone
	* then the interrupt is active again.
	*/
	sd->gc = irq_alloc_generic_chip("sdv-gpio", 1, sd->irq_base,
	sd->gpio_pub_base, handle_fasteoi_irq);
	if (!sd->gc) {
	ret = -ENOMEM;
	goto out_free_irq;
	}

	sd->gc->private = sd;
	ct = sd->gc->chip_types;
	ct->type = IRQ_TYPE_LEVEL_HIGH \| IRQ_TYPE_LEVEL_LOW;
	ct->regs.eoi = GPSTR;
	ct->regs.mask = GPIO_INT;
	ct->chip.irq_mask = irq_gc_mask_clr_bit;
	ct->chip.irq_unmask = irq_gc_mask_set_bit;
	ct->chip.irq_eoi = irq_gc_eoi;
	ct->chip.irq_set_type = sdv_gpio_pub_set_type;

	irq_setup_generic_chip(sd->gc, IRQ_MSK(SDV_NUM_PUB_GPIOS),
	IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST,
	IRQ_LEVEL \| IRQ_NOPROBE);

	sd->id = irq_domain_add_legacy(pdev->dev.of_node, SDV_NUM_PUB_GPIOS,
	sd->irq_base, 0, &irq_domain_sdv_ops, sd);
	if (!sd->id) {
	ret = -ENODEV;
	goto out_free_irq;
	}
	return 0;
	out_free_irq:
	free_irq(pdev->irq, sd);
	out_free_desc:
	irq_free_descs(sd->irq_base, SDV_NUM_PUB_GPIOS);
	return ret;
	}

	static int sdv_gpio_probe(struct pci_dev *pdev,
	const struct pci_device_id *pci_id)
	{
	struct sdv_gpio_chip_data *sd;
	unsigned long addr;
	const void *prop;
	int len;
	int ret;
	u32 mux_val;

	sd = kzalloc(sizeof(struct sdv_gpio_chip_data), GFP_KERNEL);
	if (!sd)
	return -ENOMEM;
	ret = pci_enable_device(pdev);
	if (ret) {
	dev_err(&pdev->dev, "can't enable device.\n");
	goto done;
	}

	ret = pci_request_region(pdev, GPIO_BAR, DRV_NAME);
	if (ret) {
	dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", GPIO_BAR);
	goto disable_pci;
	}

	addr = pci_resource_start(pdev, GPIO_BAR);
	if (!addr) {
	ret = -ENODEV;
	goto release_reg;
	}
	sd->gpio_pub_base = ioremap(addr, pci_resource_len(pdev, GPIO_BAR));

	prop = of_get_property(pdev->dev.of_node, "intel,muxctl", &len);
	if (prop && len == 4) {
	mux_val = of_read_number(prop, 1);
	writel(mux_val, sd->gpio_pub_base + GPMUXCTL);
	}

	ret = bgpio_init(&sd->bgpio, &pdev->dev, 4,
	sd->gpio_pub_base + GPINR, sd->gpio_pub_base + GPOUTR,
	NULL, sd->gpio_pub_base + GPOER, NULL, 0);
	if (ret)
	goto unmap;
	sd->bgpio.gc.ngpio = SDV_NUM_PUB_GPIOS;

	ret = gpiochip_add(&sd->bgpio.gc);
	if (ret < 0) {
	dev_err(&pdev->dev, "gpiochip_add() failed.\n");
	goto unmap;
	}

	ret = sdv_register_irqsupport(sd, pdev);
	if (ret)
	goto unmap;

	pci_set_drvdata(pdev, sd);
	dev_info(&pdev->dev, "Sodaville GPIO driver registered.\n");
	return 0;

	unmap:
	iounmap(sd->gpio_pub_base);
	release_reg:
	pci_release_region(pdev, GPIO_BAR);
	disable_pci:
	pci_disable_device(pdev);
	done:
	kfree(sd);
	return ret;
	}

	static void sdv_gpio_remove(struct pci_dev *pdev)
	{
	struct sdv_gpio_chip_data *sd = pci_get_drvdata(pdev);

	free_irq(pdev->irq, sd);
	irq_free_descs(sd->irq_base, SDV_NUM_PUB_GPIOS);

	gpiochip_remove(&sd->bgpio.gc);
	pci_release_region(pdev, GPIO_BAR);
	iounmap(sd->gpio_pub_base);
	pci_disable_device(pdev);
	kfree(sd);
	}

	static const struct pci_device_id sdv_gpio_pci_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_SDV_GPIO) },
	{ 0, },
	};

	static struct pci_driver sdv_gpio_driver = {
	.name = DRV_NAME,
	.id_table = sdv_gpio_pci_ids,
	.probe = sdv_gpio_probe,
	.remove = sdv_gpio_remove,
	};

	module_pci_driver(sdv_gpio_driver);

	MODULE_AUTHOR("Hans J. Koch <hjk@linutronix.de>");
	MODULE_DESCRIPTION("GPIO interface for Intel Sodaville SoCs");
	MODULE_LICENSE("GPL v2");