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0f4630f372
The separate struct bgpio_chip has been a pain to handle, both by being confusingly similar in name to struct gpio_chip and for being contained inside a struct so that struct gpio_chip is contained in a struct contained in a struct, making several steps of dereferencing necessary. Make things simpler: include the fields directly into <linux/gpio/driver.h>, #ifdef:ed for CONFIG_GENERIC_GPIO, and get rid of the <linux/basic_mmio_gpio.h> altogether. Prefix some of the member variables with bgpio_* and add proper kerneldoc while we're at it. Modify all users to handle the change and use a struct gpio_chip directly. And while we're at it: replace all container_of() dereferencing by gpiochip_get_data() and registering the gpio_chip with gpiochip_add_data(). Cc: arm@kernel.org Cc: Alexander Shiyan <shc_work@mail.ru> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Kukjin Kim <kgene@kernel.org> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Olof Johansson <olof@lixom.net> Cc: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Cc: Rabin Vincent <rabin@rab.in> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: bcm-kernel-feedback-list@broadcom.com Acked-by: Gregory Fong <gregory.0xf0@gmail.com> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
687 lines
17 KiB
C
687 lines
17 KiB
C
/*
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* Copyright (c) 2011 Jamie Iles
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* All enquiries to support@picochip.com
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*/
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#include <linux/gpio/driver.h>
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/* FIXME: for gpio_get_value(), replace this with direct register read */
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#include <linux/gpio.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/platform_data/gpio-dwapb.h>
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#include <linux/slab.h>
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#define GPIO_SWPORTA_DR 0x00
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#define GPIO_SWPORTA_DDR 0x04
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#define GPIO_SWPORTB_DR 0x0c
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#define GPIO_SWPORTB_DDR 0x10
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#define GPIO_SWPORTC_DR 0x18
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#define GPIO_SWPORTC_DDR 0x1c
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#define GPIO_SWPORTD_DR 0x24
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#define GPIO_SWPORTD_DDR 0x28
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#define GPIO_INTEN 0x30
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#define GPIO_INTMASK 0x34
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#define GPIO_INTTYPE_LEVEL 0x38
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#define GPIO_INT_POLARITY 0x3c
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#define GPIO_INTSTATUS 0x40
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#define GPIO_PORTA_DEBOUNCE 0x48
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#define GPIO_PORTA_EOI 0x4c
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#define GPIO_EXT_PORTA 0x50
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#define GPIO_EXT_PORTB 0x54
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#define GPIO_EXT_PORTC 0x58
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#define GPIO_EXT_PORTD 0x5c
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#define DWAPB_MAX_PORTS 4
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#define GPIO_EXT_PORT_SIZE (GPIO_EXT_PORTB - GPIO_EXT_PORTA)
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#define GPIO_SWPORT_DR_SIZE (GPIO_SWPORTB_DR - GPIO_SWPORTA_DR)
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#define GPIO_SWPORT_DDR_SIZE (GPIO_SWPORTB_DDR - GPIO_SWPORTA_DDR)
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struct dwapb_gpio;
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#ifdef CONFIG_PM_SLEEP
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/* Store GPIO context across system-wide suspend/resume transitions */
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struct dwapb_context {
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u32 data;
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u32 dir;
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u32 ext;
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u32 int_en;
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u32 int_mask;
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u32 int_type;
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u32 int_pol;
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u32 int_deb;
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};
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#endif
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struct dwapb_gpio_port {
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struct gpio_chip gc;
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bool is_registered;
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struct dwapb_gpio *gpio;
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#ifdef CONFIG_PM_SLEEP
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struct dwapb_context *ctx;
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#endif
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unsigned int idx;
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};
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struct dwapb_gpio {
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struct device *dev;
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void __iomem *regs;
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struct dwapb_gpio_port *ports;
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unsigned int nr_ports;
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struct irq_domain *domain;
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};
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static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset)
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{
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struct gpio_chip *gc = &gpio->ports[0].gc;
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void __iomem *reg_base = gpio->regs;
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return gc->read_reg(reg_base + offset);
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}
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static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
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u32 val)
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{
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struct gpio_chip *gc = &gpio->ports[0].gc;
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void __iomem *reg_base = gpio->regs;
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gc->write_reg(reg_base + offset, val);
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}
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static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct dwapb_gpio_port *port = gpiochip_get_data(gc);
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struct dwapb_gpio *gpio = port->gpio;
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return irq_find_mapping(gpio->domain, offset);
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}
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static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs)
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{
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u32 v = dwapb_read(gpio, GPIO_INT_POLARITY);
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if (gpio_get_value(gpio->ports[0].gc.base + offs))
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v &= ~BIT(offs);
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else
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v |= BIT(offs);
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dwapb_write(gpio, GPIO_INT_POLARITY, v);
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}
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static u32 dwapb_do_irq(struct dwapb_gpio *gpio)
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{
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u32 irq_status = readl_relaxed(gpio->regs + GPIO_INTSTATUS);
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u32 ret = irq_status;
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while (irq_status) {
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int hwirq = fls(irq_status) - 1;
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int gpio_irq = irq_find_mapping(gpio->domain, hwirq);
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generic_handle_irq(gpio_irq);
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irq_status &= ~BIT(hwirq);
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if ((irq_get_trigger_type(gpio_irq) & IRQ_TYPE_SENSE_MASK)
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== IRQ_TYPE_EDGE_BOTH)
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dwapb_toggle_trigger(gpio, hwirq);
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}
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return ret;
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}
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static void dwapb_irq_handler(struct irq_desc *desc)
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{
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struct dwapb_gpio *gpio = irq_desc_get_handler_data(desc);
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struct irq_chip *chip = irq_desc_get_chip(desc);
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dwapb_do_irq(gpio);
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if (chip->irq_eoi)
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chip->irq_eoi(irq_desc_get_irq_data(desc));
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}
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static void dwapb_irq_enable(struct irq_data *d)
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{
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struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
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struct dwapb_gpio *gpio = igc->private;
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struct gpio_chip *gc = &gpio->ports[0].gc;
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unsigned long flags;
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u32 val;
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spin_lock_irqsave(&gc->bgpio_lock, flags);
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val = dwapb_read(gpio, GPIO_INTEN);
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val |= BIT(d->hwirq);
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dwapb_write(gpio, GPIO_INTEN, val);
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spin_unlock_irqrestore(&gc->bgpio_lock, flags);
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}
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static void dwapb_irq_disable(struct irq_data *d)
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{
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struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
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struct dwapb_gpio *gpio = igc->private;
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struct gpio_chip *gc = &gpio->ports[0].gc;
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unsigned long flags;
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u32 val;
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spin_lock_irqsave(&gc->bgpio_lock, flags);
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val = dwapb_read(gpio, GPIO_INTEN);
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val &= ~BIT(d->hwirq);
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dwapb_write(gpio, GPIO_INTEN, val);
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spin_unlock_irqrestore(&gc->bgpio_lock, flags);
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}
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static int dwapb_irq_reqres(struct irq_data *d)
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{
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struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
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struct dwapb_gpio *gpio = igc->private;
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struct gpio_chip *gc = &gpio->ports[0].gc;
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if (gpiochip_lock_as_irq(gc, irqd_to_hwirq(d))) {
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dev_err(gpio->dev, "unable to lock HW IRQ %lu for IRQ\n",
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irqd_to_hwirq(d));
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return -EINVAL;
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}
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return 0;
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}
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static void dwapb_irq_relres(struct irq_data *d)
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{
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struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
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struct dwapb_gpio *gpio = igc->private;
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struct gpio_chip *gc = &gpio->ports[0].gc;
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gpiochip_unlock_as_irq(gc, irqd_to_hwirq(d));
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}
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static int dwapb_irq_set_type(struct irq_data *d, u32 type)
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{
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struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
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struct dwapb_gpio *gpio = igc->private;
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struct gpio_chip *gc = &gpio->ports[0].gc;
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int bit = d->hwirq;
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unsigned long level, polarity, flags;
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if (type & ~(IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
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IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
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return -EINVAL;
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spin_lock_irqsave(&gc->bgpio_lock, flags);
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level = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
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polarity = dwapb_read(gpio, GPIO_INT_POLARITY);
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switch (type) {
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case IRQ_TYPE_EDGE_BOTH:
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level |= BIT(bit);
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dwapb_toggle_trigger(gpio, bit);
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break;
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case IRQ_TYPE_EDGE_RISING:
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level |= BIT(bit);
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polarity |= BIT(bit);
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break;
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case IRQ_TYPE_EDGE_FALLING:
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level |= BIT(bit);
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polarity &= ~BIT(bit);
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break;
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case IRQ_TYPE_LEVEL_HIGH:
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level &= ~BIT(bit);
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polarity |= BIT(bit);
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break;
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case IRQ_TYPE_LEVEL_LOW:
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level &= ~BIT(bit);
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polarity &= ~BIT(bit);
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break;
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}
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irq_setup_alt_chip(d, type);
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dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level);
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dwapb_write(gpio, GPIO_INT_POLARITY, polarity);
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spin_unlock_irqrestore(&gc->bgpio_lock, flags);
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return 0;
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}
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static int dwapb_gpio_set_debounce(struct gpio_chip *gc,
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unsigned offset, unsigned debounce)
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{
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struct dwapb_gpio_port *port = gpiochip_get_data(gc);
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struct dwapb_gpio *gpio = port->gpio;
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unsigned long flags, val_deb;
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unsigned long mask = gc->pin2mask(gc, offset);
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spin_lock_irqsave(&gc->bgpio_lock, flags);
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val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
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if (debounce)
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dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb | mask);
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else
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dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb & ~mask);
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spin_unlock_irqrestore(&gc->bgpio_lock, flags);
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return 0;
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}
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static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id)
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{
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u32 worked;
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struct dwapb_gpio *gpio = dev_id;
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worked = dwapb_do_irq(gpio);
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return worked ? IRQ_HANDLED : IRQ_NONE;
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}
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static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
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struct dwapb_gpio_port *port,
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struct dwapb_port_property *pp)
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{
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struct gpio_chip *gc = &port->gc;
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struct device_node *node = pp->node;
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struct irq_chip_generic *irq_gc = NULL;
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unsigned int hwirq, ngpio = gc->ngpio;
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struct irq_chip_type *ct;
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int err, i;
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gpio->domain = irq_domain_add_linear(node, ngpio,
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&irq_generic_chip_ops, gpio);
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if (!gpio->domain)
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return;
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err = irq_alloc_domain_generic_chips(gpio->domain, ngpio, 2,
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"gpio-dwapb", handle_level_irq,
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IRQ_NOREQUEST, 0,
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IRQ_GC_INIT_NESTED_LOCK);
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if (err) {
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dev_info(gpio->dev, "irq_alloc_domain_generic_chips failed\n");
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irq_domain_remove(gpio->domain);
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gpio->domain = NULL;
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return;
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}
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irq_gc = irq_get_domain_generic_chip(gpio->domain, 0);
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if (!irq_gc) {
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irq_domain_remove(gpio->domain);
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gpio->domain = NULL;
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return;
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}
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irq_gc->reg_base = gpio->regs;
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irq_gc->private = gpio;
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for (i = 0; i < 2; i++) {
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ct = &irq_gc->chip_types[i];
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ct->chip.irq_ack = irq_gc_ack_set_bit;
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ct->chip.irq_mask = irq_gc_mask_set_bit;
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ct->chip.irq_unmask = irq_gc_mask_clr_bit;
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ct->chip.irq_set_type = dwapb_irq_set_type;
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ct->chip.irq_enable = dwapb_irq_enable;
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ct->chip.irq_disable = dwapb_irq_disable;
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ct->chip.irq_request_resources = dwapb_irq_reqres;
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ct->chip.irq_release_resources = dwapb_irq_relres;
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ct->regs.ack = GPIO_PORTA_EOI;
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ct->regs.mask = GPIO_INTMASK;
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ct->type = IRQ_TYPE_LEVEL_MASK;
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}
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irq_gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK;
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irq_gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH;
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irq_gc->chip_types[1].handler = handle_edge_irq;
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if (!pp->irq_shared) {
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irq_set_chained_handler_and_data(pp->irq, dwapb_irq_handler,
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gpio);
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} else {
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/*
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* Request a shared IRQ since where MFD would have devices
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* using the same irq pin
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*/
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err = devm_request_irq(gpio->dev, pp->irq,
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dwapb_irq_handler_mfd,
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IRQF_SHARED, "gpio-dwapb-mfd", gpio);
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if (err) {
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dev_err(gpio->dev, "error requesting IRQ\n");
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irq_domain_remove(gpio->domain);
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gpio->domain = NULL;
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return;
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}
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}
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for (hwirq = 0 ; hwirq < ngpio ; hwirq++)
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irq_create_mapping(gpio->domain, hwirq);
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port->gc.to_irq = dwapb_gpio_to_irq;
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}
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static void dwapb_irq_teardown(struct dwapb_gpio *gpio)
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{
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struct dwapb_gpio_port *port = &gpio->ports[0];
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struct gpio_chip *gc = &port->gc;
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unsigned int ngpio = gc->ngpio;
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irq_hw_number_t hwirq;
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if (!gpio->domain)
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return;
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for (hwirq = 0 ; hwirq < ngpio ; hwirq++)
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irq_dispose_mapping(irq_find_mapping(gpio->domain, hwirq));
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irq_domain_remove(gpio->domain);
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gpio->domain = NULL;
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}
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static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
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struct dwapb_port_property *pp,
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unsigned int offs)
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{
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struct dwapb_gpio_port *port;
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void __iomem *dat, *set, *dirout;
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int err;
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port = &gpio->ports[offs];
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port->gpio = gpio;
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port->idx = pp->idx;
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#ifdef CONFIG_PM_SLEEP
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port->ctx = devm_kzalloc(gpio->dev, sizeof(*port->ctx), GFP_KERNEL);
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if (!port->ctx)
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return -ENOMEM;
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#endif
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dat = gpio->regs + GPIO_EXT_PORTA + (pp->idx * GPIO_EXT_PORT_SIZE);
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set = gpio->regs + GPIO_SWPORTA_DR + (pp->idx * GPIO_SWPORT_DR_SIZE);
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dirout = gpio->regs + GPIO_SWPORTA_DDR +
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(pp->idx * GPIO_SWPORT_DDR_SIZE);
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err = bgpio_init(&port->gc, gpio->dev, 4, dat, set, NULL, dirout,
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NULL, false);
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if (err) {
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dev_err(gpio->dev, "failed to init gpio chip for %s\n",
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pp->name);
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return err;
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}
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#ifdef CONFIG_OF_GPIO
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port->gc.of_node = pp->node;
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#endif
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port->gc.ngpio = pp->ngpio;
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port->gc.base = pp->gpio_base;
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/* Only port A support debounce */
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if (pp->idx == 0)
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port->gc.set_debounce = dwapb_gpio_set_debounce;
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if (pp->irq)
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dwapb_configure_irqs(gpio, port, pp);
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err = gpiochip_add_data(&port->gc, port);
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if (err)
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dev_err(gpio->dev, "failed to register gpiochip for %s\n",
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pp->name);
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else
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port->is_registered = true;
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return err;
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}
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static void dwapb_gpio_unregister(struct dwapb_gpio *gpio)
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{
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unsigned int m;
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for (m = 0; m < gpio->nr_ports; ++m)
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if (gpio->ports[m].is_registered)
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gpiochip_remove(&gpio->ports[m].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 gpio_chip *gc = &gpio->ports[0].gc;
|
|
unsigned long flags;
|
|
int i;
|
|
|
|
spin_lock_irqsave(&gc->bgpio_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(&gc->bgpio_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 gpio_chip *gc = &gpio->ports[0].gc;
|
|
unsigned long flags;
|
|
int i;
|
|
|
|
spin_lock_irqsave(&gc->bgpio_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(&gc->bgpio_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");
|