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![Andy Shevchenko](/assets/img/avatar_default.png)
There is no need to have an additional check to call acpi_gpiochip_request_interrupts(). Even without any interrupts available the registered ACPI Event handlers can be useful for debugging purposes. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200512182721.55127-3-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
337 lines
9 KiB
C
337 lines
9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AppliedMicro X-Gene SoC GPIO-Standby Driver
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*
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* Copyright (c) 2014, Applied Micro Circuits Corporation
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* Author: Tin Huynh <tnhuynh@apm.com>.
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* Y Vo <yvo@apm.com>.
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* Quan Nguyen <qnguyen@apm.com>.
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*/
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/of.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/acpi.h>
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#include "gpiolib.h"
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#include "gpiolib-acpi.h"
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/* Common property names */
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#define XGENE_NIRQ_PROPERTY "apm,nr-irqs"
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#define XGENE_NGPIO_PROPERTY "apm,nr-gpios"
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#define XGENE_IRQ_START_PROPERTY "apm,irq-start"
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#define XGENE_DFLT_MAX_NGPIO 22
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#define XGENE_DFLT_MAX_NIRQ 6
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#define XGENE_DFLT_IRQ_START_PIN 8
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#define GPIO_MASK(x) (1U << ((x) % 32))
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#define MPA_GPIO_INT_LVL 0x0290
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#define MPA_GPIO_OE_ADDR 0x029c
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#define MPA_GPIO_OUT_ADDR 0x02a0
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#define MPA_GPIO_IN_ADDR 0x02a4
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#define MPA_GPIO_SEL_LO 0x0294
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#define GPIO_INT_LEVEL_H 0x000001
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#define GPIO_INT_LEVEL_L 0x000000
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/**
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* struct xgene_gpio_sb - GPIO-Standby private data structure.
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* @gc: memory-mapped GPIO controllers.
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* @regs: GPIO register base offset
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* @irq_domain: GPIO interrupt domain
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* @irq_start: GPIO pin that start support interrupt
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* @nirq: Number of GPIO pins that supports interrupt
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* @parent_irq_base: Start parent HWIRQ
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*/
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struct xgene_gpio_sb {
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struct gpio_chip gc;
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void __iomem *regs;
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struct irq_domain *irq_domain;
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u16 irq_start;
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u16 nirq;
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u16 parent_irq_base;
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};
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#define HWIRQ_TO_GPIO(priv, hwirq) ((hwirq) + (priv)->irq_start)
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#define GPIO_TO_HWIRQ(priv, gpio) ((gpio) - (priv)->irq_start)
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static void xgene_gpio_set_bit(struct gpio_chip *gc,
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void __iomem *reg, u32 gpio, int val)
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{
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u32 data;
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data = gc->read_reg(reg);
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if (val)
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data |= GPIO_MASK(gpio);
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else
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data &= ~GPIO_MASK(gpio);
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gc->write_reg(reg, data);
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}
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static int xgene_gpio_sb_irq_set_type(struct irq_data *d, unsigned int type)
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{
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struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d);
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int gpio = HWIRQ_TO_GPIO(priv, d->hwirq);
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int lvl_type = GPIO_INT_LEVEL_H;
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switch (type & IRQ_TYPE_SENSE_MASK) {
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case IRQ_TYPE_EDGE_RISING:
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case IRQ_TYPE_LEVEL_HIGH:
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lvl_type = GPIO_INT_LEVEL_H;
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break;
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case IRQ_TYPE_EDGE_FALLING:
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case IRQ_TYPE_LEVEL_LOW:
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lvl_type = GPIO_INT_LEVEL_L;
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break;
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default:
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break;
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}
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xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
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gpio * 2, 1);
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xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_INT_LVL,
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d->hwirq, lvl_type);
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/* Propagate IRQ type setting to parent */
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if (type & IRQ_TYPE_EDGE_BOTH)
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return irq_chip_set_type_parent(d, IRQ_TYPE_EDGE_RISING);
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else
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return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
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}
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static struct irq_chip xgene_gpio_sb_irq_chip = {
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.name = "sbgpio",
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.irq_eoi = irq_chip_eoi_parent,
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.irq_mask = irq_chip_mask_parent,
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.irq_unmask = irq_chip_unmask_parent,
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.irq_set_type = xgene_gpio_sb_irq_set_type,
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};
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static int xgene_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio)
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{
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struct xgene_gpio_sb *priv = gpiochip_get_data(gc);
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struct irq_fwspec fwspec;
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if ((gpio < priv->irq_start) ||
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(gpio > HWIRQ_TO_GPIO(priv, priv->nirq)))
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return -ENXIO;
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fwspec.fwnode = gc->parent->fwnode;
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fwspec.param_count = 2;
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fwspec.param[0] = GPIO_TO_HWIRQ(priv, gpio);
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fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
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return irq_create_fwspec_mapping(&fwspec);
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}
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static int xgene_gpio_sb_domain_activate(struct irq_domain *d,
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struct irq_data *irq_data,
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bool reserve)
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{
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struct xgene_gpio_sb *priv = d->host_data;
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u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);
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int ret;
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ret = gpiochip_lock_as_irq(&priv->gc, gpio);
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if (ret) {
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dev_err(priv->gc.parent,
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"Unable to configure XGene GPIO standby pin %d as IRQ\n",
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gpio);
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return ret;
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}
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xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
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gpio * 2, 1);
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return 0;
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}
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static void xgene_gpio_sb_domain_deactivate(struct irq_domain *d,
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struct irq_data *irq_data)
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{
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struct xgene_gpio_sb *priv = d->host_data;
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u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);
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gpiochip_unlock_as_irq(&priv->gc, gpio);
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xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
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gpio * 2, 0);
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}
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static int xgene_gpio_sb_domain_translate(struct irq_domain *d,
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struct irq_fwspec *fwspec,
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unsigned long *hwirq,
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unsigned int *type)
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{
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struct xgene_gpio_sb *priv = d->host_data;
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if ((fwspec->param_count != 2) ||
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(fwspec->param[0] >= priv->nirq))
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return -EINVAL;
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*hwirq = fwspec->param[0];
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*type = fwspec->param[1];
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return 0;
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}
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static int xgene_gpio_sb_domain_alloc(struct irq_domain *domain,
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unsigned int virq,
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unsigned int nr_irqs, void *data)
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{
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struct irq_fwspec *fwspec = data;
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struct irq_fwspec parent_fwspec;
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struct xgene_gpio_sb *priv = domain->host_data;
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irq_hw_number_t hwirq;
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unsigned int i;
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hwirq = fwspec->param[0];
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for (i = 0; i < nr_irqs; i++)
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irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
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&xgene_gpio_sb_irq_chip, priv);
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parent_fwspec.fwnode = domain->parent->fwnode;
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if (is_of_node(parent_fwspec.fwnode)) {
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parent_fwspec.param_count = 3;
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parent_fwspec.param[0] = 0;/* SPI */
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/* Skip SGIs and PPIs*/
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parent_fwspec.param[1] = hwirq + priv->parent_irq_base - 32;
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parent_fwspec.param[2] = fwspec->param[1];
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} else if (is_fwnode_irqchip(parent_fwspec.fwnode)) {
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parent_fwspec.param_count = 2;
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parent_fwspec.param[0] = hwirq + priv->parent_irq_base;
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parent_fwspec.param[1] = fwspec->param[1];
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} else
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return -EINVAL;
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return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
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&parent_fwspec);
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}
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static const struct irq_domain_ops xgene_gpio_sb_domain_ops = {
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.translate = xgene_gpio_sb_domain_translate,
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.alloc = xgene_gpio_sb_domain_alloc,
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.free = irq_domain_free_irqs_common,
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.activate = xgene_gpio_sb_domain_activate,
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.deactivate = xgene_gpio_sb_domain_deactivate,
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};
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static int xgene_gpio_sb_probe(struct platform_device *pdev)
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{
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struct xgene_gpio_sb *priv;
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int ret;
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void __iomem *regs;
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struct irq_domain *parent_domain = NULL;
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u32 val32;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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priv->regs = regs;
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ret = platform_get_irq(pdev, 0);
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if (ret > 0) {
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priv->parent_irq_base = irq_get_irq_data(ret)->hwirq;
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parent_domain = irq_get_irq_data(ret)->domain;
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}
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if (!parent_domain) {
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dev_err(&pdev->dev, "unable to obtain parent domain\n");
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return -ENODEV;
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}
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ret = bgpio_init(&priv->gc, &pdev->dev, 4,
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regs + MPA_GPIO_IN_ADDR,
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regs + MPA_GPIO_OUT_ADDR, NULL,
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regs + MPA_GPIO_OE_ADDR, NULL, 0);
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if (ret)
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return ret;
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priv->gc.to_irq = xgene_gpio_sb_to_irq;
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/* Retrieve start irq pin, use default if property not found */
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priv->irq_start = XGENE_DFLT_IRQ_START_PIN;
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if (!device_property_read_u32(&pdev->dev,
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XGENE_IRQ_START_PROPERTY, &val32))
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priv->irq_start = val32;
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/* Retrieve number irqs, use default if property not found */
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priv->nirq = XGENE_DFLT_MAX_NIRQ;
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if (!device_property_read_u32(&pdev->dev, XGENE_NIRQ_PROPERTY, &val32))
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priv->nirq = val32;
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/* Retrieve number gpio, use default if property not found */
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priv->gc.ngpio = XGENE_DFLT_MAX_NGPIO;
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if (!device_property_read_u32(&pdev->dev, XGENE_NGPIO_PROPERTY, &val32))
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priv->gc.ngpio = val32;
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dev_info(&pdev->dev, "Support %d gpios, %d irqs start from pin %d\n",
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priv->gc.ngpio, priv->nirq, priv->irq_start);
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platform_set_drvdata(pdev, priv);
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priv->irq_domain = irq_domain_create_hierarchy(parent_domain,
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0, priv->nirq, pdev->dev.fwnode,
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&xgene_gpio_sb_domain_ops, priv);
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if (!priv->irq_domain)
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return -ENODEV;
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priv->gc.irq.domain = priv->irq_domain;
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ret = devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
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if (ret) {
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dev_err(&pdev->dev,
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"failed to register X-Gene GPIO Standby driver\n");
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irq_domain_remove(priv->irq_domain);
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return ret;
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}
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dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n");
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/* Register interrupt handlers for GPIO signaled ACPI Events */
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acpi_gpiochip_request_interrupts(&priv->gc);
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return ret;
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}
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static int xgene_gpio_sb_remove(struct platform_device *pdev)
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{
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struct xgene_gpio_sb *priv = platform_get_drvdata(pdev);
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acpi_gpiochip_free_interrupts(&priv->gc);
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irq_domain_remove(priv->irq_domain);
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return 0;
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}
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static const struct of_device_id xgene_gpio_sb_of_match[] = {
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{.compatible = "apm,xgene-gpio-sb", },
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{},
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};
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MODULE_DEVICE_TABLE(of, xgene_gpio_sb_of_match);
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id xgene_gpio_sb_acpi_match[] = {
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{"APMC0D15", 0},
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{},
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};
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MODULE_DEVICE_TABLE(acpi, xgene_gpio_sb_acpi_match);
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#endif
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static struct platform_driver xgene_gpio_sb_driver = {
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.driver = {
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.name = "xgene-gpio-sb",
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.of_match_table = xgene_gpio_sb_of_match,
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.acpi_match_table = ACPI_PTR(xgene_gpio_sb_acpi_match),
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},
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.probe = xgene_gpio_sb_probe,
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.remove = xgene_gpio_sb_remove,
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};
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module_platform_driver(xgene_gpio_sb_driver);
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MODULE_AUTHOR("AppliedMicro");
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MODULE_DESCRIPTION("APM X-Gene GPIO Standby driver");
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MODULE_LICENSE("GPL");
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