--- /dev/null
+/*
+ * Driver for UniPhier AIDET (ARM Interrupt Detector)
+ *
+ * Copyright (C) 2017 Socionext Inc.
+ * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * 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.
+ */
+
+#include <linux/bitops.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#define UNIPHIER_AIDET_NR_IRQS 256
+
+#define UNIPHIER_AIDET_DETCONF 0x04 /* inverter register base */
+
+struct uniphier_aidet_priv {
+ struct irq_domain *domain;
+ void __iomem *reg_base;
+ spinlock_t lock;
+ u32 saved_vals[UNIPHIER_AIDET_NR_IRQS / 32];
+};
+
+static void uniphier_aidet_reg_update(struct uniphier_aidet_priv *priv,
+ unsigned int reg, u32 mask, u32 val)
+{
+ unsigned long flags;
+ u32 tmp;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ tmp = readl_relaxed(priv->reg_base + reg);
+ tmp &= ~mask;
+ tmp |= mask & val;
+ writel_relaxed(tmp, priv->reg_base + reg);
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void uniphier_aidet_detconf_update(struct uniphier_aidet_priv *priv,
+ unsigned long index, unsigned int val)
+{
+ unsigned int reg;
+ u32 mask;
+
+ reg = UNIPHIER_AIDET_DETCONF + index / 32 * 4;
+ mask = BIT(index % 32);
+
+ uniphier_aidet_reg_update(priv, reg, mask, val ? mask : 0);
+}
+
+static int uniphier_aidet_irq_set_type(struct irq_data *data, unsigned int type)
+{
+ struct uniphier_aidet_priv *priv = data->chip_data;
+ unsigned int val;
+
+ /* enable inverter for active low triggers */
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ case IRQ_TYPE_LEVEL_HIGH:
+ val = 0;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ val = 1;
+ type = IRQ_TYPE_EDGE_RISING;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ val = 1;
+ type = IRQ_TYPE_LEVEL_HIGH;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ uniphier_aidet_detconf_update(priv, data->hwirq, val);
+
+ return irq_chip_set_type_parent(data, type);
+}
+
+static struct irq_chip uniphier_aidet_irq_chip = {
+ .name = "AIDET",
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_set_affinity = irq_chip_set_affinity_parent,
+ .irq_set_type = uniphier_aidet_irq_set_type,
+};
+
+static int uniphier_aidet_domain_translate(struct irq_domain *domain,
+ struct irq_fwspec *fwspec,
+ unsigned long *out_hwirq,
+ unsigned int *out_type)
+{
+ if (WARN_ON(fwspec->param_count < 2))
+ return -EINVAL;
+
+ *out_hwirq = fwspec->param[0];
+ *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
+
+ return 0;
+}
+
+static int uniphier_aidet_domain_alloc(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs,
+ void *arg)
+{
+ struct irq_fwspec parent_fwspec;
+ irq_hw_number_t hwirq;
+ unsigned int type;
+ int ret;
+
+ if (nr_irqs != 1)
+ return -EINVAL;
+
+ ret = uniphier_aidet_domain_translate(domain, arg, &hwirq, &type);
+ if (ret)
+ return ret;
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ case IRQ_TYPE_LEVEL_HIGH:
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ type = IRQ_TYPE_EDGE_RISING;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ type = IRQ_TYPE_LEVEL_HIGH;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (hwirq >= UNIPHIER_AIDET_NR_IRQS)
+ return -ENXIO;
+
+ ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+ &uniphier_aidet_irq_chip,
+ domain->host_data);
+ if (ret)
+ return ret;
+
+ /* parent is GIC */
+ parent_fwspec.fwnode = domain->parent->fwnode;
+ parent_fwspec.param_count = 3;
+ parent_fwspec.param[0] = 0; /* SPI */
+ parent_fwspec.param[1] = hwirq;
+ parent_fwspec.param[2] = type;
+
+ return irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
+}
+
+static const struct irq_domain_ops uniphier_aidet_domain_ops = {
+ .alloc = uniphier_aidet_domain_alloc,
+ .free = irq_domain_free_irqs_common,
+ .translate = uniphier_aidet_domain_translate,
+};
+
+static int uniphier_aidet_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *parent_np;
+ struct irq_domain *parent_domain;
+ struct uniphier_aidet_priv *priv;
+ struct resource *res;
+
+ parent_np = of_irq_find_parent(dev->of_node);
+ if (!parent_np)
+ return -ENXIO;
+
+ parent_domain = irq_find_host(parent_np);
+ of_node_put(parent_np);
+ if (!parent_domain)
+ return -EPROBE_DEFER;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->reg_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->reg_base))
+ return PTR_ERR(priv->reg_base);
+
+ spin_lock_init(&priv->lock);
+
+ priv->domain = irq_domain_create_hierarchy(
+ parent_domain, 0,
+ UNIPHIER_AIDET_NR_IRQS,
+ of_node_to_fwnode(dev->of_node),
+ &uniphier_aidet_domain_ops, priv);
+ if (!priv->domain)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, priv);
+
+ return 0;
+}
+
+static int __maybe_unused uniphier_aidet_suspend(struct device *dev)
+{
+ struct uniphier_aidet_priv *priv = dev_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(priv->saved_vals); i++)
+ priv->saved_vals[i] = readl_relaxed(
+ priv->reg_base + UNIPHIER_AIDET_DETCONF + i * 4);
+
+ return 0;
+}
+
+static int __maybe_unused uniphier_aidet_resume(struct device *dev)
+{
+ struct uniphier_aidet_priv *priv = dev_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(priv->saved_vals); i++)
+ writel_relaxed(priv->saved_vals[i],
+ priv->reg_base + UNIPHIER_AIDET_DETCONF + i * 4);
+
+ return 0;
+}
+
+static const struct dev_pm_ops uniphier_aidet_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(uniphier_aidet_suspend,
+ uniphier_aidet_resume)
+};
+
+static const struct of_device_id uniphier_aidet_match[] = {
+ { .compatible = "socionext,uniphier-ld4-aidet" },
+ { .compatible = "socionext,uniphier-pro4-aidet" },
+ { .compatible = "socionext,uniphier-sld8-aidet" },
+ { .compatible = "socionext,uniphier-pro5-aidet" },
+ { .compatible = "socionext,uniphier-pxs2-aidet" },
+ { .compatible = "socionext,uniphier-ld11-aidet" },
+ { .compatible = "socionext,uniphier-ld20-aidet" },
+ { .compatible = "socionext,uniphier-pxs3-aidet" },
+ { /* sentinel */ }
+};
+
+static struct platform_driver uniphier_aidet_driver = {
+ .probe = uniphier_aidet_probe,
+ .driver = {
+ .name = "uniphier-aidet",
+ .of_match_table = uniphier_aidet_match,
+ .pm = &uniphier_aidet_pm_ops,
+ },
+};
+builtin_platform_driver(uniphier_aidet_driver);
projects / mirror_ubuntu-bionic-kernel.git / commitdiff