/* * Texas Instruments Keystone IRQ controller IP driver * * Copyright (C) 2014 Texas Instruments, Inc. * Author: Sajesh Kumar Saran <sajesh@ti.com> * Grygorii Strashko <grygorii.strashko@ti.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/irq.h> #include <linux/bitops.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/irqdomain.h> #include <linux/irqchip/chained_irq.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/mfd/syscon.h> #include <linux/regmap.h> #include "irqchip.h" /* The source ID bits start from 4 to 31 (total 28 bits)*/ #define BIT_OFS 4 #define KEYSTONE_N_IRQ (32 - BIT_OFS) struct keystone_irq_device { struct device *dev; struct irq_chip chip; u32 mask; int irq; struct irq_domain *irqd; struct regmap *devctrl_regs; u32 devctrl_offset; }; static inline u32 keystone_irq_readl(struct keystone_irq_device *kirq) { int ret; u32 val = 0; ret = regmap_read(kirq->devctrl_regs, kirq->devctrl_offset, &val); if (ret < 0) dev_dbg(kirq->dev, "irq read failed ret(%d)\n", ret); return val; } static inline void keystone_irq_writel(struct keystone_irq_device *kirq, u32 value) { int ret; ret = regmap_write(kirq->devctrl_regs, kirq->devctrl_offset, value); if (ret < 0) dev_dbg(kirq->dev, "irq write failed ret(%d)\n", ret); } static void keystone_irq_setmask(struct irq_data *d) { struct keystone_irq_device *kirq = irq_data_get_irq_chip_data(d); kirq->mask |= BIT(d->hwirq); dev_dbg(kirq->dev, "mask %lu [%x]\n", d->hwirq, kirq->mask); } static void keystone_irq_unmask(struct irq_data *d) { struct keystone_irq_device *kirq = irq_data_get_irq_chip_data(d); kirq->mask &= ~BIT(d->hwirq); dev_dbg(kirq->dev, "unmask %lu [%x]\n", d->hwirq, kirq->mask); } static void keystone_irq_ack(struct irq_data *d) { /* nothing to do here */ } static void keystone_irq_handler(unsigned irq, struct irq_desc *desc) { struct keystone_irq_device *kirq = irq_desc_get_handler_data(desc); unsigned long pending; int src, virq; dev_dbg(kirq->dev, "start irq %d\n", irq); chained_irq_enter(irq_desc_get_chip(desc), desc); pending = keystone_irq_readl(kirq); keystone_irq_writel(kirq, pending); dev_dbg(kirq->dev, "pending 0x%lx, mask 0x%x\n", pending, kirq->mask); pending = (pending >> BIT_OFS) & ~kirq->mask; dev_dbg(kirq->dev, "pending after mask 0x%lx\n", pending); for (src = 0; src < KEYSTONE_N_IRQ; src++) { if (BIT(src) & pending) { virq = irq_find_mapping(kirq->irqd, src); dev_dbg(kirq->dev, "dispatch bit %d, virq %d\n", src, virq); if (!virq) dev_warn(kirq->dev, "sporious irq detected hwirq %d, virq %d\n", src, virq); generic_handle_irq(virq); } } chained_irq_exit(irq_desc_get_chip(desc), desc); dev_dbg(kirq->dev, "end irq %d\n", irq); } static int keystone_irq_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw) { struct keystone_irq_device *kirq = h->host_data; irq_set_chip_data(virq, kirq); irq_set_chip_and_handler(virq, &kirq->chip, handle_level_irq); set_irq_flags(virq, IRQF_VALID | IRQF_PROBE); return 0; } static const struct irq_domain_ops keystone_irq_ops = { .map = keystone_irq_map, .xlate = irq_domain_xlate_onecell, }; static int keystone_irq_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct keystone_irq_device *kirq; int ret; if (np == NULL) return -EINVAL; kirq = devm_kzalloc(dev, sizeof(*kirq), GFP_KERNEL); if (!kirq) return -ENOMEM; kirq->devctrl_regs = syscon_regmap_lookup_by_phandle(np, "ti,syscon-dev"); if (IS_ERR(kirq->devctrl_regs)) return PTR_ERR(kirq->devctrl_regs); ret = of_property_read_u32_index(np, "ti,syscon-dev", 1, &kirq->devctrl_offset); if (ret) { dev_err(dev, "couldn't read the devctrl_offset offset!\n"); return ret; } kirq->irq = platform_get_irq(pdev, 0); if (kirq->irq < 0) { dev_err(dev, "no irq resource %d\n", kirq->irq); return kirq->irq; } kirq->dev = dev; kirq->mask = ~0x0; kirq->chip.name = "keystone-irq"; kirq->chip.irq_ack = keystone_irq_ack; kirq->chip.irq_mask = keystone_irq_setmask; kirq->chip.irq_unmask = keystone_irq_unmask; kirq->irqd = irq_domain_add_linear(np, KEYSTONE_N_IRQ, &keystone_irq_ops, kirq); if (!kirq->irqd) { dev_err(dev, "IRQ domain registration failed\n"); return -ENODEV; } platform_set_drvdata(pdev, kirq); irq_set_chained_handler_and_data(kirq->irq, keystone_irq_handler, kirq); /* clear all source bits */ keystone_irq_writel(kirq, ~0x0); dev_info(dev, "irqchip registered, nr_irqs %u\n", KEYSTONE_N_IRQ); return 0; } static int keystone_irq_remove(struct platform_device *pdev) { struct keystone_irq_device *kirq = platform_get_drvdata(pdev); int hwirq; for (hwirq = 0; hwirq < KEYSTONE_N_IRQ; hwirq++) irq_dispose_mapping(irq_find_mapping(kirq->irqd, hwirq)); irq_domain_remove(kirq->irqd); return 0; } static const struct of_device_id keystone_irq_dt_ids[] = { { .compatible = "ti,keystone-irq", }, {}, }; MODULE_DEVICE_TABLE(of, keystone_irq_dt_ids); static struct platform_driver keystone_irq_device_driver = { .probe = keystone_irq_probe, .remove = keystone_irq_remove, .driver = { .name = "keystone_irq", .of_match_table = of_match_ptr(keystone_irq_dt_ids), } }; module_platform_driver(keystone_irq_device_driver); MODULE_AUTHOR("Texas Instruments"); MODULE_AUTHOR("Sajesh Kumar Saran"); MODULE_AUTHOR("Grygorii Strashko"); MODULE_DESCRIPTION("Keystone IRQ chip"); MODULE_LICENSE("GPL v2");