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Based on 1 normalized pattern(s): 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 this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 136 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.384967451@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
249 lines
6.4 KiB
C
249 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Abilis Systems MODULE DESCRIPTION
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*
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* Copyright (C) Abilis Systems 2013
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*
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* Authors: Sascha Leuenberger <sascha.leuenberger@abilis.com>
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* Christian Ruppert <christian.ruppert@abilis.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/gpio/driver.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/spinlock.h>
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#include <linux/bitops.h>
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#include <linux/pinctrl/consumer.h>
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#define TB10X_GPIO_DIR_IN (0x00000000)
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#define TB10X_GPIO_DIR_OUT (0x00000001)
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#define OFFSET_TO_REG_DDR (0x00)
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#define OFFSET_TO_REG_DATA (0x04)
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#define OFFSET_TO_REG_INT_EN (0x08)
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#define OFFSET_TO_REG_CHANGE (0x0C)
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#define OFFSET_TO_REG_WRMASK (0x10)
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#define OFFSET_TO_REG_INT_TYPE (0x14)
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/**
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* @base: register base address
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* @domain: IRQ domain of GPIO generated interrupts managed by this controller
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* @irq: Interrupt line of parent interrupt controller
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* @gc: gpio_chip structure associated to this GPIO controller
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*/
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struct tb10x_gpio {
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void __iomem *base;
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struct irq_domain *domain;
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int irq;
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struct gpio_chip gc;
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};
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static inline u32 tb10x_reg_read(struct tb10x_gpio *gpio, unsigned int offs)
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{
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return ioread32(gpio->base + offs);
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}
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static inline void tb10x_reg_write(struct tb10x_gpio *gpio, unsigned int offs,
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u32 val)
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{
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iowrite32(val, gpio->base + offs);
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}
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static inline void tb10x_set_bits(struct tb10x_gpio *gpio, unsigned int offs,
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u32 mask, u32 val)
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{
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u32 r;
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unsigned long flags;
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spin_lock_irqsave(&gpio->gc.bgpio_lock, flags);
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r = tb10x_reg_read(gpio, offs);
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r = (r & ~mask) | (val & mask);
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tb10x_reg_write(gpio, offs, r);
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spin_unlock_irqrestore(&gpio->gc.bgpio_lock, flags);
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}
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static int tb10x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct tb10x_gpio *tb10x_gpio = gpiochip_get_data(chip);
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return irq_create_mapping(tb10x_gpio->domain, offset);
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}
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static int tb10x_gpio_irq_set_type(struct irq_data *data, unsigned int type)
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{
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if ((type & IRQF_TRIGGER_MASK) != IRQ_TYPE_EDGE_BOTH) {
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pr_err("Only (both) edge triggered interrupts supported.\n");
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return -EINVAL;
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}
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irqd_set_trigger_type(data, type);
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return IRQ_SET_MASK_OK;
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}
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static irqreturn_t tb10x_gpio_irq_cascade(int irq, void *data)
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{
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struct tb10x_gpio *tb10x_gpio = data;
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u32 r = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_CHANGE);
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u32 m = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_INT_EN);
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const unsigned long bits = r & m;
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int i;
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for_each_set_bit(i, &bits, 32)
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generic_handle_irq(irq_find_mapping(tb10x_gpio->domain, i));
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return IRQ_HANDLED;
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}
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static int tb10x_gpio_probe(struct platform_device *pdev)
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{
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struct tb10x_gpio *tb10x_gpio;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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int ret = -EBUSY;
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u32 ngpio;
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if (!np)
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return -EINVAL;
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if (of_property_read_u32(np, "abilis,ngpio", &ngpio))
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return -EINVAL;
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tb10x_gpio = devm_kzalloc(dev, sizeof(*tb10x_gpio), GFP_KERNEL);
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if (tb10x_gpio == NULL)
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return -ENOMEM;
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tb10x_gpio->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(tb10x_gpio->base))
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return PTR_ERR(tb10x_gpio->base);
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tb10x_gpio->gc.label =
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devm_kasprintf(dev, GFP_KERNEL, "%pOF", pdev->dev.of_node);
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if (!tb10x_gpio->gc.label)
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return -ENOMEM;
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/*
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* Initialize generic GPIO with one single register for reading and setting
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* the lines, no special set or clear registers and a data direction register
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* wher 1 means "output".
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*/
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ret = bgpio_init(&tb10x_gpio->gc, dev, 4,
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tb10x_gpio->base + OFFSET_TO_REG_DATA,
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NULL,
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NULL,
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tb10x_gpio->base + OFFSET_TO_REG_DDR,
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NULL,
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0);
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if (ret) {
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dev_err(dev, "unable to init generic GPIO\n");
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return ret;
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}
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tb10x_gpio->gc.base = -1;
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tb10x_gpio->gc.parent = dev;
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tb10x_gpio->gc.owner = THIS_MODULE;
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/*
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* ngpio is set by bgpio_init() but we override it, this .request()
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* callback also overrides the one set up by generic GPIO.
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*/
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tb10x_gpio->gc.ngpio = ngpio;
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tb10x_gpio->gc.request = gpiochip_generic_request;
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tb10x_gpio->gc.free = gpiochip_generic_free;
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ret = devm_gpiochip_add_data(dev, &tb10x_gpio->gc, tb10x_gpio);
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if (ret < 0) {
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dev_err(dev, "Could not add gpiochip.\n");
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return ret;
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}
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platform_set_drvdata(pdev, tb10x_gpio);
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if (of_find_property(np, "interrupt-controller", NULL)) {
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struct irq_chip_generic *gc;
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ret = platform_get_irq(pdev, 0);
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if (ret < 0) {
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dev_err(dev, "No interrupt specified.\n");
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return ret;
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}
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tb10x_gpio->gc.to_irq = tb10x_gpio_to_irq;
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tb10x_gpio->irq = ret;
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ret = devm_request_irq(dev, ret, tb10x_gpio_irq_cascade,
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IRQF_TRIGGER_NONE | IRQF_SHARED,
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dev_name(dev), tb10x_gpio);
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if (ret != 0)
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return ret;
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tb10x_gpio->domain = irq_domain_add_linear(np,
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tb10x_gpio->gc.ngpio,
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&irq_generic_chip_ops, NULL);
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if (!tb10x_gpio->domain) {
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return -ENOMEM;
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}
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ret = irq_alloc_domain_generic_chips(tb10x_gpio->domain,
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tb10x_gpio->gc.ngpio, 1, tb10x_gpio->gc.label,
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handle_edge_irq, IRQ_NOREQUEST, IRQ_NOPROBE,
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IRQ_GC_INIT_MASK_CACHE);
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if (ret)
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return ret;
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gc = tb10x_gpio->domain->gc->gc[0];
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gc->reg_base = tb10x_gpio->base;
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gc->chip_types[0].type = IRQ_TYPE_EDGE_BOTH;
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gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
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gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
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gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
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gc->chip_types[0].chip.irq_set_type = tb10x_gpio_irq_set_type;
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gc->chip_types[0].regs.ack = OFFSET_TO_REG_CHANGE;
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gc->chip_types[0].regs.mask = OFFSET_TO_REG_INT_EN;
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}
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return 0;
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}
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static int tb10x_gpio_remove(struct platform_device *pdev)
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{
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struct tb10x_gpio *tb10x_gpio = platform_get_drvdata(pdev);
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if (tb10x_gpio->gc.to_irq) {
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irq_remove_generic_chip(tb10x_gpio->domain->gc->gc[0],
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BIT(tb10x_gpio->gc.ngpio) - 1, 0, 0);
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kfree(tb10x_gpio->domain->gc);
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irq_domain_remove(tb10x_gpio->domain);
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}
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return 0;
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}
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static const struct of_device_id tb10x_gpio_dt_ids[] = {
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{ .compatible = "abilis,tb10x-gpio" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, tb10x_gpio_dt_ids);
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static struct platform_driver tb10x_gpio_driver = {
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.probe = tb10x_gpio_probe,
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.remove = tb10x_gpio_remove,
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.driver = {
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.name = "tb10x-gpio",
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.of_match_table = tb10x_gpio_dt_ids,
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}
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};
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module_platform_driver(tb10x_gpio_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("tb10x gpio.");
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MODULE_VERSION("0.0.1");
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