/* * Driver for UniPhier AIDET (ARM Interrupt Detector) * * Copyright (C) 2017 Socionext Inc. * Author: Masahiro Yamada * * 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 #include #include #include #include #include #include #include #include #include #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);