1 /* 2 * Copyright (c) 2014 MediaTek Inc. 3 * Author: Joe.C <yingjoe.chen@mediatek.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #include <linux/irq.h> 16 #include <linux/irqdomain.h> 17 #include <linux/of.h> 18 #include <linux/of_irq.h> 19 #include <linux/of_address.h> 20 #include <linux/io.h> 21 #include <linux/slab.h> 22 #include <linux/spinlock.h> 23 24 #include "irqchip.h" 25 26 struct mtk_sysirq_chip_data { 27 spinlock_t lock; 28 void __iomem *intpol_base; 29 }; 30 31 static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type) 32 { 33 irq_hw_number_t hwirq = data->hwirq; 34 struct mtk_sysirq_chip_data *chip_data = data->chip_data; 35 u32 offset, reg_index, value; 36 unsigned long flags; 37 int ret; 38 39 offset = hwirq & 0x1f; 40 reg_index = hwirq >> 5; 41 42 spin_lock_irqsave(&chip_data->lock, flags); 43 value = readl_relaxed(chip_data->intpol_base + reg_index * 4); 44 if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) { 45 if (type == IRQ_TYPE_LEVEL_LOW) 46 type = IRQ_TYPE_LEVEL_HIGH; 47 else 48 type = IRQ_TYPE_EDGE_RISING; 49 value |= (1 << offset); 50 } else { 51 value &= ~(1 << offset); 52 } 53 writel(value, chip_data->intpol_base + reg_index * 4); 54 55 data = data->parent_data; 56 ret = data->chip->irq_set_type(data, type); 57 spin_unlock_irqrestore(&chip_data->lock, flags); 58 return ret; 59 } 60 61 static struct irq_chip mtk_sysirq_chip = { 62 .name = "MT_SYSIRQ", 63 .irq_mask = irq_chip_mask_parent, 64 .irq_unmask = irq_chip_unmask_parent, 65 .irq_eoi = irq_chip_eoi_parent, 66 .irq_set_type = mtk_sysirq_set_type, 67 .irq_retrigger = irq_chip_retrigger_hierarchy, 68 .irq_set_affinity = irq_chip_set_affinity_parent, 69 }; 70 71 static int mtk_sysirq_domain_xlate(struct irq_domain *d, 72 struct device_node *controller, 73 const u32 *intspec, unsigned int intsize, 74 unsigned long *out_hwirq, 75 unsigned int *out_type) 76 { 77 if (intsize != 3) 78 return -EINVAL; 79 80 /* sysirq doesn't support PPI */ 81 if (intspec[0]) 82 return -EINVAL; 83 84 *out_hwirq = intspec[1]; 85 *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; 86 return 0; 87 } 88 89 static int mtk_sysirq_domain_alloc(struct irq_domain *domain, unsigned int virq, 90 unsigned int nr_irqs, void *arg) 91 { 92 int i; 93 irq_hw_number_t hwirq; 94 struct of_phandle_args *irq_data = arg; 95 struct of_phandle_args gic_data = *irq_data; 96 97 if (irq_data->args_count != 3) 98 return -EINVAL; 99 100 /* sysirq doesn't support PPI */ 101 if (irq_data->args[0]) 102 return -EINVAL; 103 104 hwirq = irq_data->args[1]; 105 for (i = 0; i < nr_irqs; i++) 106 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, 107 &mtk_sysirq_chip, 108 domain->host_data); 109 110 gic_data.np = domain->parent->of_node; 111 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_data); 112 } 113 114 static struct irq_domain_ops sysirq_domain_ops = { 115 .xlate = mtk_sysirq_domain_xlate, 116 .alloc = mtk_sysirq_domain_alloc, 117 .free = irq_domain_free_irqs_common, 118 }; 119 120 static int __init mtk_sysirq_of_init(struct device_node *node, 121 struct device_node *parent) 122 { 123 struct irq_domain *domain, *domain_parent; 124 struct mtk_sysirq_chip_data *chip_data; 125 int ret, size, intpol_num; 126 struct resource res; 127 128 domain_parent = irq_find_host(parent); 129 if (!domain_parent) { 130 pr_err("mtk_sysirq: interrupt-parent not found\n"); 131 return -EINVAL; 132 } 133 134 ret = of_address_to_resource(node, 0, &res); 135 if (ret) 136 return ret; 137 138 chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL); 139 if (!chip_data) 140 return -ENOMEM; 141 142 size = resource_size(&res); 143 intpol_num = size * 8; 144 chip_data->intpol_base = ioremap(res.start, size); 145 if (!chip_data->intpol_base) { 146 pr_err("mtk_sysirq: unable to map sysirq register\n"); 147 ret = PTR_ERR(chip_data->intpol_base); 148 goto out_free; 149 } 150 151 domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node, 152 &sysirq_domain_ops, chip_data); 153 if (!domain) { 154 ret = -ENOMEM; 155 goto out_unmap; 156 } 157 spin_lock_init(&chip_data->lock); 158 159 return 0; 160 161 out_unmap: 162 iounmap(chip_data->intpol_base); 163 out_free: 164 kfree(chip_data); 165 return ret; 166 } 167 IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init); 168