15fe3bba3SYingjoe Chen /* 25fe3bba3SYingjoe Chen * Copyright (c) 2014 MediaTek Inc. 35fe3bba3SYingjoe Chen * Author: Joe.C <yingjoe.chen@mediatek.com> 45fe3bba3SYingjoe Chen * 55fe3bba3SYingjoe Chen * This program is free software; you can redistribute it and/or modify 65fe3bba3SYingjoe Chen * it under the terms of the GNU General Public License version 2 as 75fe3bba3SYingjoe Chen * published by the Free Software Foundation. 85fe3bba3SYingjoe Chen * 95fe3bba3SYingjoe Chen * This program is distributed in the hope that it will be useful, 105fe3bba3SYingjoe Chen * but WITHOUT ANY WARRANTY; without even the implied warranty of 115fe3bba3SYingjoe Chen * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 125fe3bba3SYingjoe Chen * GNU General Public License for more details. 135fe3bba3SYingjoe Chen */ 145fe3bba3SYingjoe Chen 155fe3bba3SYingjoe Chen #include <linux/irq.h> 165fe3bba3SYingjoe Chen #include <linux/irqdomain.h> 175fe3bba3SYingjoe Chen #include <linux/of.h> 185fe3bba3SYingjoe Chen #include <linux/of_irq.h> 195fe3bba3SYingjoe Chen #include <linux/of_address.h> 205fe3bba3SYingjoe Chen #include <linux/io.h> 215fe3bba3SYingjoe Chen #include <linux/slab.h> 225fe3bba3SYingjoe Chen #include <linux/spinlock.h> 235fe3bba3SYingjoe Chen 245fe3bba3SYingjoe Chen #include "irqchip.h" 255fe3bba3SYingjoe Chen 265fe3bba3SYingjoe Chen #define MT6577_SYS_INTPOL_NUM (224) 275fe3bba3SYingjoe Chen 285fe3bba3SYingjoe Chen struct mtk_sysirq_chip_data { 295fe3bba3SYingjoe Chen spinlock_t lock; 305fe3bba3SYingjoe Chen void __iomem *intpol_base; 315fe3bba3SYingjoe Chen }; 325fe3bba3SYingjoe Chen 335fe3bba3SYingjoe Chen static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type) 345fe3bba3SYingjoe Chen { 355fe3bba3SYingjoe Chen irq_hw_number_t hwirq = data->hwirq; 365fe3bba3SYingjoe Chen struct mtk_sysirq_chip_data *chip_data = data->chip_data; 375fe3bba3SYingjoe Chen u32 offset, reg_index, value; 385fe3bba3SYingjoe Chen unsigned long flags; 395fe3bba3SYingjoe Chen int ret; 405fe3bba3SYingjoe Chen 415fe3bba3SYingjoe Chen offset = hwirq & 0x1f; 425fe3bba3SYingjoe Chen reg_index = hwirq >> 5; 435fe3bba3SYingjoe Chen 445fe3bba3SYingjoe Chen spin_lock_irqsave(&chip_data->lock, flags); 455fe3bba3SYingjoe Chen value = readl_relaxed(chip_data->intpol_base + reg_index * 4); 465fe3bba3SYingjoe Chen if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) { 475fe3bba3SYingjoe Chen if (type == IRQ_TYPE_LEVEL_LOW) 485fe3bba3SYingjoe Chen type = IRQ_TYPE_LEVEL_HIGH; 495fe3bba3SYingjoe Chen else 505fe3bba3SYingjoe Chen type = IRQ_TYPE_EDGE_RISING; 515fe3bba3SYingjoe Chen value |= (1 << offset); 525fe3bba3SYingjoe Chen } else { 535fe3bba3SYingjoe Chen value &= ~(1 << offset); 545fe3bba3SYingjoe Chen } 555fe3bba3SYingjoe Chen writel(value, chip_data->intpol_base + reg_index * 4); 565fe3bba3SYingjoe Chen 575fe3bba3SYingjoe Chen data = data->parent_data; 585fe3bba3SYingjoe Chen ret = data->chip->irq_set_type(data, type); 595fe3bba3SYingjoe Chen spin_unlock_irqrestore(&chip_data->lock, flags); 605fe3bba3SYingjoe Chen return ret; 615fe3bba3SYingjoe Chen } 625fe3bba3SYingjoe Chen 635fe3bba3SYingjoe Chen static struct irq_chip mtk_sysirq_chip = { 645fe3bba3SYingjoe Chen .name = "MT_SYSIRQ", 655fe3bba3SYingjoe Chen .irq_mask = irq_chip_mask_parent, 665fe3bba3SYingjoe Chen .irq_unmask = irq_chip_unmask_parent, 675fe3bba3SYingjoe Chen .irq_eoi = irq_chip_eoi_parent, 685fe3bba3SYingjoe Chen .irq_set_type = mtk_sysirq_set_type, 695fe3bba3SYingjoe Chen .irq_retrigger = irq_chip_retrigger_hierarchy, 705fe3bba3SYingjoe Chen .irq_set_affinity = irq_chip_set_affinity_parent, 715fe3bba3SYingjoe Chen }; 725fe3bba3SYingjoe Chen 735fe3bba3SYingjoe Chen static int mtk_sysirq_domain_xlate(struct irq_domain *d, 745fe3bba3SYingjoe Chen struct device_node *controller, 755fe3bba3SYingjoe Chen const u32 *intspec, unsigned int intsize, 765fe3bba3SYingjoe Chen unsigned long *out_hwirq, 775fe3bba3SYingjoe Chen unsigned int *out_type) 785fe3bba3SYingjoe Chen { 795fe3bba3SYingjoe Chen if (intsize != 3) 805fe3bba3SYingjoe Chen return -EINVAL; 815fe3bba3SYingjoe Chen 825fe3bba3SYingjoe Chen /* sysirq doesn't support PPI */ 835fe3bba3SYingjoe Chen if (intspec[0]) 845fe3bba3SYingjoe Chen return -EINVAL; 855fe3bba3SYingjoe Chen 865fe3bba3SYingjoe Chen *out_hwirq = intspec[1]; 875fe3bba3SYingjoe Chen *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; 885fe3bba3SYingjoe Chen return 0; 895fe3bba3SYingjoe Chen } 905fe3bba3SYingjoe Chen 915fe3bba3SYingjoe Chen static int mtk_sysirq_domain_alloc(struct irq_domain *domain, unsigned int virq, 925fe3bba3SYingjoe Chen unsigned int nr_irqs, void *arg) 935fe3bba3SYingjoe Chen { 945fe3bba3SYingjoe Chen int i; 955fe3bba3SYingjoe Chen irq_hw_number_t hwirq; 965fe3bba3SYingjoe Chen struct of_phandle_args *irq_data = arg; 975fe3bba3SYingjoe Chen struct of_phandle_args gic_data = *irq_data; 985fe3bba3SYingjoe Chen 995fe3bba3SYingjoe Chen if (irq_data->args_count != 3) 1005fe3bba3SYingjoe Chen return -EINVAL; 1015fe3bba3SYingjoe Chen 1025fe3bba3SYingjoe Chen /* sysirq doesn't support PPI */ 1035fe3bba3SYingjoe Chen if (irq_data->args[0]) 1045fe3bba3SYingjoe Chen return -EINVAL; 1055fe3bba3SYingjoe Chen 1065fe3bba3SYingjoe Chen hwirq = irq_data->args[1]; 1075fe3bba3SYingjoe Chen for (i = 0; i < nr_irqs; i++) 1085fe3bba3SYingjoe Chen irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, 1095fe3bba3SYingjoe Chen &mtk_sysirq_chip, 1105fe3bba3SYingjoe Chen domain->host_data); 1115fe3bba3SYingjoe Chen 1125fe3bba3SYingjoe Chen gic_data.np = domain->parent->of_node; 1135fe3bba3SYingjoe Chen return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_data); 1145fe3bba3SYingjoe Chen } 1155fe3bba3SYingjoe Chen 1165fe3bba3SYingjoe Chen static struct irq_domain_ops sysirq_domain_ops = { 1175fe3bba3SYingjoe Chen .xlate = mtk_sysirq_domain_xlate, 1185fe3bba3SYingjoe Chen .alloc = mtk_sysirq_domain_alloc, 1195fe3bba3SYingjoe Chen .free = irq_domain_free_irqs_common, 1205fe3bba3SYingjoe Chen }; 1215fe3bba3SYingjoe Chen 1225fe3bba3SYingjoe Chen static int __init mtk_sysirq_of_init(struct device_node *node, 1235fe3bba3SYingjoe Chen struct device_node *parent) 1245fe3bba3SYingjoe Chen { 1255fe3bba3SYingjoe Chen struct irq_domain *domain, *domain_parent; 1265fe3bba3SYingjoe Chen struct mtk_sysirq_chip_data *chip_data; 1275fe3bba3SYingjoe Chen int ret = 0; 1285fe3bba3SYingjoe Chen 1295fe3bba3SYingjoe Chen domain_parent = irq_find_host(parent); 1305fe3bba3SYingjoe Chen if (!domain_parent) { 1315fe3bba3SYingjoe Chen pr_err("mtk_sysirq: interrupt-parent not found\n"); 1325fe3bba3SYingjoe Chen return -EINVAL; 1335fe3bba3SYingjoe Chen } 1345fe3bba3SYingjoe Chen 1355fe3bba3SYingjoe Chen chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL); 1365fe3bba3SYingjoe Chen if (!chip_data) 1375fe3bba3SYingjoe Chen return -ENOMEM; 1385fe3bba3SYingjoe Chen 1395fe3bba3SYingjoe Chen chip_data->intpol_base = of_io_request_and_map(node, 0, "intpol"); 1405fe3bba3SYingjoe Chen if (!chip_data->intpol_base) { 1415fe3bba3SYingjoe Chen pr_err("mtk_sysirq: unable to map sysirq register\n"); 1425fe3bba3SYingjoe Chen ret = -ENOMEM; 1435fe3bba3SYingjoe Chen goto out_free; 1445fe3bba3SYingjoe Chen } 1455fe3bba3SYingjoe Chen 1465fe3bba3SYingjoe Chen domain = irq_domain_add_hierarchy(domain_parent, 0, 1475fe3bba3SYingjoe Chen MT6577_SYS_INTPOL_NUM, node, 1485fe3bba3SYingjoe Chen &sysirq_domain_ops, chip_data); 1495fe3bba3SYingjoe Chen if (!domain) { 1505fe3bba3SYingjoe Chen ret = -ENOMEM; 1515fe3bba3SYingjoe Chen goto out_unmap; 1525fe3bba3SYingjoe Chen } 1535fe3bba3SYingjoe Chen spin_lock_init(&chip_data->lock); 1545fe3bba3SYingjoe Chen 1555fe3bba3SYingjoe Chen return 0; 1565fe3bba3SYingjoe Chen 1575fe3bba3SYingjoe Chen out_unmap: 1585fe3bba3SYingjoe Chen iounmap(chip_data->intpol_base); 1595fe3bba3SYingjoe Chen out_free: 1605fe3bba3SYingjoe Chen kfree(chip_data); 1615fe3bba3SYingjoe Chen return ret; 1625fe3bba3SYingjoe Chen } 1635fe3bba3SYingjoe Chen IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init); 164