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- /*
- * Copyright (c) 2011 Jamie Iles
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * All enquiries to support@picochip.com
- */
- #include <linux/basic_mmio_gpio.h>
- #include <linux/err.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/io.h>
- #include <linux/ioport.h>
- #include <linux/irq.h>
- #include <linux/irqdomain.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/of_address.h>
- #include <linux/of_irq.h>
- #include <linux/platform_device.h>
- #include <linux/spinlock.h>
- #include <linux/platform_data/gpio-dwapb.h>
- #include <linux/slab.h>
- #define GPIO_SWPORTA_DR 0x00
- #define GPIO_SWPORTA_DDR 0x04
- #define GPIO_SWPORTB_DR 0x0c
- #define GPIO_SWPORTB_DDR 0x10
- #define GPIO_SWPORTC_DR 0x18
- #define GPIO_SWPORTC_DDR 0x1c
- #define GPIO_SWPORTD_DR 0x24
- #define GPIO_SWPORTD_DDR 0x28
- #define GPIO_INTEN 0x30
- #define GPIO_INTMASK 0x34
- #define GPIO_INTTYPE_LEVEL 0x38
- #define GPIO_INT_POLARITY 0x3c
- #define GPIO_INTSTATUS 0x40
- #define GPIO_PORTA_DEBOUNCE 0x48
- #define GPIO_PORTA_EOI 0x4c
- #define GPIO_EXT_PORTA 0x50
- #define GPIO_EXT_PORTB 0x54
- #define GPIO_EXT_PORTC 0x58
- #define GPIO_EXT_PORTD 0x5c
- #define DWAPB_MAX_PORTS 4
- #define GPIO_EXT_PORT_SIZE (GPIO_EXT_PORTB - GPIO_EXT_PORTA)
- #define GPIO_SWPORT_DR_SIZE (GPIO_SWPORTB_DR - GPIO_SWPORTA_DR)
- #define GPIO_SWPORT_DDR_SIZE (GPIO_SWPORTB_DDR - GPIO_SWPORTA_DDR)
- struct dwapb_gpio;
- #ifdef CONFIG_PM_SLEEP
- /* Store GPIO context across system-wide suspend/resume transitions */
- struct dwapb_context {
- u32 data;
- u32 dir;
- u32 ext;
- u32 int_en;
- u32 int_mask;
- u32 int_type;
- u32 int_pol;
- u32 int_deb;
- };
- #endif
- struct dwapb_gpio_port {
- struct bgpio_chip bgc;
- bool is_registered;
- struct dwapb_gpio *gpio;
- #ifdef CONFIG_PM_SLEEP
- struct dwapb_context *ctx;
- #endif
- unsigned int idx;
- };
- struct dwapb_gpio {
- struct device *dev;
- void __iomem *regs;
- struct dwapb_gpio_port *ports;
- unsigned int nr_ports;
- struct irq_domain *domain;
- };
- static inline struct dwapb_gpio_port *
- to_dwapb_gpio_port(struct bgpio_chip *bgc)
- {
- return container_of(bgc, struct dwapb_gpio_port, bgc);
- }
- static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset)
- {
- struct bgpio_chip *bgc = &gpio->ports[0].bgc;
- void __iomem *reg_base = gpio->regs;
- return bgc->read_reg(reg_base + offset);
- }
- static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
- u32 val)
- {
- struct bgpio_chip *bgc = &gpio->ports[0].bgc;
- void __iomem *reg_base = gpio->regs;
- bgc->write_reg(reg_base + offset, val);
- }
- static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
- {
- struct bgpio_chip *bgc = to_bgpio_chip(gc);
- struct dwapb_gpio_port *port = to_dwapb_gpio_port(bgc);
- struct dwapb_gpio *gpio = port->gpio;
- return irq_find_mapping(gpio->domain, offset);
- }
- static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs)
- {
- u32 v = dwapb_read(gpio, GPIO_INT_POLARITY);
- if (gpio_get_value(gpio->ports[0].bgc.gc.base + offs))
- v &= ~BIT(offs);
- else
- v |= BIT(offs);
- dwapb_write(gpio, GPIO_INT_POLARITY, v);
- }
- static u32 dwapb_do_irq(struct dwapb_gpio *gpio)
- {
- u32 irq_status = readl_relaxed(gpio->regs + GPIO_INTSTATUS);
- u32 ret = irq_status;
- while (irq_status) {
- int hwirq = fls(irq_status) - 1;
- int gpio_irq = irq_find_mapping(gpio->domain, hwirq);
- generic_handle_irq(gpio_irq);
- irq_status &= ~BIT(hwirq);
- if ((irq_get_trigger_type(gpio_irq) & IRQ_TYPE_SENSE_MASK)
- == IRQ_TYPE_EDGE_BOTH)
- dwapb_toggle_trigger(gpio, hwirq);
- }
- return ret;
- }
- static void dwapb_irq_handler(struct irq_desc *desc)
- {
- struct dwapb_gpio *gpio = irq_desc_get_handler_data(desc);
- struct irq_chip *chip = irq_desc_get_chip(desc);
- dwapb_do_irq(gpio);
- if (chip->irq_eoi)
- chip->irq_eoi(irq_desc_get_irq_data(desc));
- }
- static void dwapb_irq_enable(struct irq_data *d)
- {
- struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
- struct dwapb_gpio *gpio = igc->private;
- struct bgpio_chip *bgc = &gpio->ports[0].bgc;
- unsigned long flags;
- u32 val;
- spin_lock_irqsave(&bgc->lock, flags);
- val = dwapb_read(gpio, GPIO_INTEN);
- val |= BIT(d->hwirq);
- dwapb_write(gpio, GPIO_INTEN, val);
- spin_unlock_irqrestore(&bgc->lock, flags);
- }
- static void dwapb_irq_disable(struct irq_data *d)
- {
- struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
- struct dwapb_gpio *gpio = igc->private;
- struct bgpio_chip *bgc = &gpio->ports[0].bgc;
- unsigned long flags;
- u32 val;
- spin_lock_irqsave(&bgc->lock, flags);
- val = dwapb_read(gpio, GPIO_INTEN);
- val &= ~BIT(d->hwirq);
- dwapb_write(gpio, GPIO_INTEN, val);
- spin_unlock_irqrestore(&bgc->lock, flags);
- }
- static int dwapb_irq_reqres(struct irq_data *d)
- {
- struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
- struct dwapb_gpio *gpio = igc->private;
- struct bgpio_chip *bgc = &gpio->ports[0].bgc;
- if (gpiochip_lock_as_irq(&bgc->gc, irqd_to_hwirq(d))) {
- dev_err(gpio->dev, "unable to lock HW IRQ %lu for IRQ\n",
- irqd_to_hwirq(d));
- return -EINVAL;
- }
- return 0;
- }
- static void dwapb_irq_relres(struct irq_data *d)
- {
- struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
- struct dwapb_gpio *gpio = igc->private;
- struct bgpio_chip *bgc = &gpio->ports[0].bgc;
- gpiochip_unlock_as_irq(&bgc->gc, irqd_to_hwirq(d));
- }
- static int dwapb_irq_set_type(struct irq_data *d, u32 type)
- {
- struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
- struct dwapb_gpio *gpio = igc->private;
- struct bgpio_chip *bgc = &gpio->ports[0].bgc;
- int bit = d->hwirq;
- unsigned long level, polarity, flags;
- if (type & ~(IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
- IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
- return -EINVAL;
- spin_lock_irqsave(&bgc->lock, flags);
- level = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
- polarity = dwapb_read(gpio, GPIO_INT_POLARITY);
- switch (type) {
- case IRQ_TYPE_EDGE_BOTH:
- level |= BIT(bit);
- dwapb_toggle_trigger(gpio, bit);
- break;
- case IRQ_TYPE_EDGE_RISING:
- level |= BIT(bit);
- polarity |= BIT(bit);
- break;
- case IRQ_TYPE_EDGE_FALLING:
- level |= BIT(bit);
- polarity &= ~BIT(bit);
- break;
- case IRQ_TYPE_LEVEL_HIGH:
- level &= ~BIT(bit);
- polarity |= BIT(bit);
- break;
- case IRQ_TYPE_LEVEL_LOW:
- level &= ~BIT(bit);
- polarity &= ~BIT(bit);
- break;
- }
- irq_setup_alt_chip(d, type);
- dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level);
- dwapb_write(gpio, GPIO_INT_POLARITY, polarity);
- spin_unlock_irqrestore(&bgc->lock, flags);
- return 0;
- }
- static int dwapb_gpio_set_debounce(struct gpio_chip *gc,
- unsigned offset, unsigned debounce)
- {
- struct bgpio_chip *bgc = to_bgpio_chip(gc);
- struct dwapb_gpio_port *port = to_dwapb_gpio_port(bgc);
- struct dwapb_gpio *gpio = port->gpio;
- unsigned long flags, val_deb;
- unsigned long mask = bgc->pin2mask(bgc, offset);
- spin_lock_irqsave(&bgc->lock, flags);
- val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
- if (debounce)
- dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb | mask);
- else
- dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb & ~mask);
- spin_unlock_irqrestore(&bgc->lock, flags);
- return 0;
- }
- static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id)
- {
- u32 worked;
- struct dwapb_gpio *gpio = dev_id;
- worked = dwapb_do_irq(gpio);
- return worked ? IRQ_HANDLED : IRQ_NONE;
- }
- static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
- struct dwapb_gpio_port *port,
- struct dwapb_port_property *pp)
- {
- struct gpio_chip *gc = &port->bgc.gc;
- struct device_node *node = pp->node;
- struct irq_chip_generic *irq_gc = NULL;
- unsigned int hwirq, ngpio = gc->ngpio;
- struct irq_chip_type *ct;
- int err, i;
- gpio->domain = irq_domain_add_linear(node, ngpio,
- &irq_generic_chip_ops, gpio);
- if (!gpio->domain)
- return;
- err = irq_alloc_domain_generic_chips(gpio->domain, ngpio, 2,
- "gpio-dwapb", handle_level_irq,
- IRQ_NOREQUEST, 0,
- IRQ_GC_INIT_NESTED_LOCK);
- if (err) {
- dev_info(gpio->dev, "irq_alloc_domain_generic_chips failed\n");
- irq_domain_remove(gpio->domain);
- gpio->domain = NULL;
- return;
- }
- irq_gc = irq_get_domain_generic_chip(gpio->domain, 0);
- if (!irq_gc) {
- irq_domain_remove(gpio->domain);
- gpio->domain = NULL;
- return;
- }
- irq_gc->reg_base = gpio->regs;
- irq_gc->private = gpio;
- for (i = 0; i < 2; i++) {
- ct = &irq_gc->chip_types[i];
- ct->chip.irq_ack = irq_gc_ack_set_bit;
- ct->chip.irq_mask = irq_gc_mask_set_bit;
- ct->chip.irq_unmask = irq_gc_mask_clr_bit;
- ct->chip.irq_set_type = dwapb_irq_set_type;
- ct->chip.irq_enable = dwapb_irq_enable;
- ct->chip.irq_disable = dwapb_irq_disable;
- ct->chip.irq_request_resources = dwapb_irq_reqres;
- ct->chip.irq_release_resources = dwapb_irq_relres;
- ct->regs.ack = GPIO_PORTA_EOI;
- ct->regs.mask = GPIO_INTMASK;
- ct->type = IRQ_TYPE_LEVEL_MASK;
- }
- irq_gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK;
- irq_gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH;
- irq_gc->chip_types[1].handler = handle_edge_irq;
- if (!pp->irq_shared) {
- irq_set_chained_handler_and_data(pp->irq, dwapb_irq_handler,
- gpio);
- } else {
- /*
- * Request a shared IRQ since where MFD would have devices
- * using the same irq pin
- */
- err = devm_request_irq(gpio->dev, pp->irq,
- dwapb_irq_handler_mfd,
- IRQF_SHARED, "gpio-dwapb-mfd", gpio);
- if (err) {
- dev_err(gpio->dev, "error requesting IRQ\n");
- irq_domain_remove(gpio->domain);
- gpio->domain = NULL;
- return;
- }
- }
- for (hwirq = 0 ; hwirq < ngpio ; hwirq++)
- irq_create_mapping(gpio->domain, hwirq);
- port->bgc.gc.to_irq = dwapb_gpio_to_irq;
- }
- static void dwapb_irq_teardown(struct dwapb_gpio *gpio)
- {
- struct dwapb_gpio_port *port = &gpio->ports[0];
- struct gpio_chip *gc = &port->bgc.gc;
- unsigned int ngpio = gc->ngpio;
- irq_hw_number_t hwirq;
- if (!gpio->domain)
- return;
- for (hwirq = 0 ; hwirq < ngpio ; hwirq++)
- irq_dispose_mapping(irq_find_mapping(gpio->domain, hwirq));
- irq_domain_remove(gpio->domain);
- gpio->domain = NULL;
- }
- static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
- struct dwapb_port_property *pp,
- unsigned int offs)
- {
- struct dwapb_gpio_port *port;
- void __iomem *dat, *set, *dirout;
- int err;
- port = &gpio->ports[offs];
- port->gpio = gpio;
- port->idx = pp->idx;
- #ifdef CONFIG_PM_SLEEP
- port->ctx = devm_kzalloc(gpio->dev, sizeof(*port->ctx), GFP_KERNEL);
- if (!port->ctx)
- return -ENOMEM;
- #endif
- dat = gpio->regs + GPIO_EXT_PORTA + (pp->idx * GPIO_EXT_PORT_SIZE);
- set = gpio->regs + GPIO_SWPORTA_DR + (pp->idx * GPIO_SWPORT_DR_SIZE);
- dirout = gpio->regs + GPIO_SWPORTA_DDR +
- (pp->idx * GPIO_SWPORT_DDR_SIZE);
- err = bgpio_init(&port->bgc, gpio->dev, 4, dat, set, NULL, dirout,
- NULL, false);
- if (err) {
- dev_err(gpio->dev, "failed to init gpio chip for %s\n",
- pp->name);
- return err;
- }
- #ifdef CONFIG_OF_GPIO
- port->bgc.gc.of_node = pp->node;
- #endif
- port->bgc.gc.ngpio = pp->ngpio;
- port->bgc.gc.base = pp->gpio_base;
- /* Only port A support debounce */
- if (pp->idx == 0)
- port->bgc.gc.set_debounce = dwapb_gpio_set_debounce;
- if (pp->irq)
- dwapb_configure_irqs(gpio, port, pp);
- err = gpiochip_add(&port->bgc.gc);
- if (err)
- dev_err(gpio->dev, "failed to register gpiochip for %s\n",
- pp->name);
- else
- port->is_registered = true;
- return err;
- }
- static void dwapb_gpio_unregister(struct dwapb_gpio *gpio)
- {
- unsigned int m;
- for (m = 0; m < gpio->nr_ports; ++m)
- if (gpio->ports[m].is_registered)
- gpiochip_remove(&gpio->ports[m].bgc.gc);
- }
- static struct dwapb_platform_data *
- dwapb_gpio_get_pdata_of(struct device *dev)
- {
- struct device_node *node, *port_np;
- struct dwapb_platform_data *pdata;
- struct dwapb_port_property *pp;
- int nports;
- int i;
- node = dev->of_node;
- if (!IS_ENABLED(CONFIG_OF_GPIO) || !node)
- return ERR_PTR(-ENODEV);
- nports = of_get_child_count(node);
- if (nports == 0)
- return ERR_PTR(-ENODEV);
- pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata)
- return ERR_PTR(-ENOMEM);
- pdata->properties = devm_kcalloc(dev, nports, sizeof(*pp), GFP_KERNEL);
- if (!pdata->properties)
- return ERR_PTR(-ENOMEM);
- pdata->nports = nports;
- i = 0;
- for_each_child_of_node(node, port_np) {
- pp = &pdata->properties[i++];
- pp->node = port_np;
- if (of_property_read_u32(port_np, "reg", &pp->idx) ||
- pp->idx >= DWAPB_MAX_PORTS) {
- dev_err(dev, "missing/invalid port index for %s\n",
- port_np->full_name);
- return ERR_PTR(-EINVAL);
- }
- if (of_property_read_u32(port_np, "snps,nr-gpios",
- &pp->ngpio)) {
- dev_info(dev, "failed to get number of gpios for %s\n",
- port_np->full_name);
- pp->ngpio = 32;
- }
- /*
- * Only port A can provide interrupts in all configurations of
- * the IP.
- */
- if (pp->idx == 0 &&
- of_property_read_bool(port_np, "interrupt-controller")) {
- pp->irq = irq_of_parse_and_map(port_np, 0);
- if (!pp->irq) {
- dev_warn(dev, "no irq for bank %s\n",
- port_np->full_name);
- }
- }
- pp->irq_shared = false;
- pp->gpio_base = -1;
- pp->name = port_np->full_name;
- }
- return pdata;
- }
- static int dwapb_gpio_probe(struct platform_device *pdev)
- {
- unsigned int i;
- struct resource *res;
- struct dwapb_gpio *gpio;
- int err;
- struct device *dev = &pdev->dev;
- struct dwapb_platform_data *pdata = dev_get_platdata(dev);
- if (!pdata) {
- pdata = dwapb_gpio_get_pdata_of(dev);
- if (IS_ERR(pdata))
- return PTR_ERR(pdata);
- }
- if (!pdata->nports)
- return -ENODEV;
- gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
- if (!gpio)
- return -ENOMEM;
- gpio->dev = &pdev->dev;
- gpio->nr_ports = pdata->nports;
- gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports,
- sizeof(*gpio->ports), GFP_KERNEL);
- if (!gpio->ports)
- return -ENOMEM;
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- gpio->regs = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(gpio->regs))
- return PTR_ERR(gpio->regs);
- for (i = 0; i < gpio->nr_ports; i++) {
- err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i);
- if (err)
- goto out_unregister;
- }
- platform_set_drvdata(pdev, gpio);
- return 0;
- out_unregister:
- dwapb_gpio_unregister(gpio);
- dwapb_irq_teardown(gpio);
- return err;
- }
- static int dwapb_gpio_remove(struct platform_device *pdev)
- {
- struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
- dwapb_gpio_unregister(gpio);
- dwapb_irq_teardown(gpio);
- return 0;
- }
- static const struct of_device_id dwapb_of_match[] = {
- { .compatible = "snps,dw-apb-gpio" },
- { /* Sentinel */ }
- };
- MODULE_DEVICE_TABLE(of, dwapb_of_match);
- #ifdef CONFIG_PM_SLEEP
- static int dwapb_gpio_suspend(struct device *dev)
- {
- struct platform_device *pdev = to_platform_device(dev);
- struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
- struct bgpio_chip *bgc = &gpio->ports[0].bgc;
- unsigned long flags;
- int i;
- spin_lock_irqsave(&bgc->lock, flags);
- for (i = 0; i < gpio->nr_ports; i++) {
- unsigned int offset;
- unsigned int idx = gpio->ports[i].idx;
- struct dwapb_context *ctx = gpio->ports[i].ctx;
- BUG_ON(!ctx);
- offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE;
- ctx->dir = dwapb_read(gpio, offset);
- offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE;
- ctx->data = dwapb_read(gpio, offset);
- offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE;
- ctx->ext = dwapb_read(gpio, offset);
- /* Only port A can provide interrupts */
- if (idx == 0) {
- ctx->int_mask = dwapb_read(gpio, GPIO_INTMASK);
- ctx->int_en = dwapb_read(gpio, GPIO_INTEN);
- ctx->int_pol = dwapb_read(gpio, GPIO_INT_POLARITY);
- ctx->int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
- ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
- /* Mask out interrupts */
- dwapb_write(gpio, GPIO_INTMASK, 0xffffffff);
- }
- }
- spin_unlock_irqrestore(&bgc->lock, flags);
- return 0;
- }
- static int dwapb_gpio_resume(struct device *dev)
- {
- struct platform_device *pdev = to_platform_device(dev);
- struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
- struct bgpio_chip *bgc = &gpio->ports[0].bgc;
- unsigned long flags;
- int i;
- spin_lock_irqsave(&bgc->lock, flags);
- for (i = 0; i < gpio->nr_ports; i++) {
- unsigned int offset;
- unsigned int idx = gpio->ports[i].idx;
- struct dwapb_context *ctx = gpio->ports[i].ctx;
- BUG_ON(!ctx);
- offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE;
- dwapb_write(gpio, offset, ctx->data);
- offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE;
- dwapb_write(gpio, offset, ctx->dir);
- offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE;
- dwapb_write(gpio, offset, ctx->ext);
- /* Only port A can provide interrupts */
- if (idx == 0) {
- dwapb_write(gpio, GPIO_INTTYPE_LEVEL, ctx->int_type);
- dwapb_write(gpio, GPIO_INT_POLARITY, ctx->int_pol);
- dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ctx->int_deb);
- dwapb_write(gpio, GPIO_INTEN, ctx->int_en);
- dwapb_write(gpio, GPIO_INTMASK, ctx->int_mask);
- /* Clear out spurious interrupts */
- dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff);
- }
- }
- spin_unlock_irqrestore(&bgc->lock, flags);
- return 0;
- }
- #endif
- static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend,
- dwapb_gpio_resume);
- static struct platform_driver dwapb_gpio_driver = {
- .driver = {
- .name = "gpio-dwapb",
- .pm = &dwapb_gpio_pm_ops,
- .of_match_table = of_match_ptr(dwapb_of_match),
- },
- .probe = dwapb_gpio_probe,
- .remove = dwapb_gpio_remove,
- };
- module_platform_driver(dwapb_gpio_driver);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Jamie Iles");
- MODULE_DESCRIPTION("Synopsys DesignWare APB GPIO driver");
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