1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Abilis Systems interrupt controller driver 4 * 5 * Copyright (C) Abilis Systems 2012 6 * 7 * Author: Christian Ruppert <christian.ruppert@abilis.com> 8 */ 9 10 #include <linux/interrupt.h> 11 #include <linux/irqdomain.h> 12 #include <linux/irq.h> 13 #include <linux/irqchip.h> 14 #include <linux/of_irq.h> 15 #include <linux/of_address.h> 16 #include <linux/of_platform.h> 17 #include <linux/io.h> 18 #include <linux/slab.h> 19 #include <linux/bitops.h> 20 21 #define AB_IRQCTL_INT_ENABLE 0x00 22 #define AB_IRQCTL_INT_STATUS 0x04 23 #define AB_IRQCTL_SRC_MODE 0x08 24 #define AB_IRQCTL_SRC_POLARITY 0x0C 25 #define AB_IRQCTL_INT_MODE 0x10 26 #define AB_IRQCTL_INT_POLARITY 0x14 27 #define AB_IRQCTL_INT_FORCE 0x18 28 29 #define AB_IRQCTL_MAXIRQ 32 30 31 static inline void ab_irqctl_writereg(struct irq_chip_generic *gc, u32 reg, 32 u32 val) 33 { 34 irq_reg_writel(gc, val, reg); 35 } 36 37 static inline u32 ab_irqctl_readreg(struct irq_chip_generic *gc, u32 reg) 38 { 39 return irq_reg_readl(gc, reg); 40 } 41 42 static int tb10x_irq_set_type(struct irq_data *data, unsigned int flow_type) 43 { 44 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); 45 uint32_t im, mod, pol; 46 47 im = data->mask; 48 49 irq_gc_lock(gc); 50 51 mod = ab_irqctl_readreg(gc, AB_IRQCTL_SRC_MODE) | im; 52 pol = ab_irqctl_readreg(gc, AB_IRQCTL_SRC_POLARITY) | im; 53 54 switch (flow_type & IRQF_TRIGGER_MASK) { 55 case IRQ_TYPE_EDGE_FALLING: 56 pol ^= im; 57 break; 58 case IRQ_TYPE_LEVEL_HIGH: 59 mod ^= im; 60 break; 61 case IRQ_TYPE_NONE: 62 flow_type = IRQ_TYPE_LEVEL_LOW; 63 case IRQ_TYPE_LEVEL_LOW: 64 mod ^= im; 65 pol ^= im; 66 break; 67 case IRQ_TYPE_EDGE_RISING: 68 break; 69 default: 70 irq_gc_unlock(gc); 71 pr_err("%s: Cannot assign multiple trigger modes to IRQ %d.\n", 72 __func__, data->irq); 73 return -EBADR; 74 } 75 76 irqd_set_trigger_type(data, flow_type); 77 irq_setup_alt_chip(data, flow_type); 78 79 ab_irqctl_writereg(gc, AB_IRQCTL_SRC_MODE, mod); 80 ab_irqctl_writereg(gc, AB_IRQCTL_SRC_POLARITY, pol); 81 ab_irqctl_writereg(gc, AB_IRQCTL_INT_STATUS, im); 82 83 irq_gc_unlock(gc); 84 85 return IRQ_SET_MASK_OK; 86 } 87 88 static void tb10x_irq_cascade(struct irq_desc *desc) 89 { 90 struct irq_domain *domain = irq_desc_get_handler_data(desc); 91 unsigned int irq = irq_desc_get_irq(desc); 92 93 generic_handle_irq(irq_find_mapping(domain, irq)); 94 } 95 96 static int __init of_tb10x_init_irq(struct device_node *ictl, 97 struct device_node *parent) 98 { 99 int i, ret, nrirqs = of_irq_count(ictl); 100 struct resource mem; 101 struct irq_chip_generic *gc; 102 struct irq_domain *domain; 103 void __iomem *reg_base; 104 105 if (of_address_to_resource(ictl, 0, &mem)) { 106 pr_err("%pOFn: No registers declared in DeviceTree.\n", 107 ictl); 108 return -EINVAL; 109 } 110 111 if (!request_mem_region(mem.start, resource_size(&mem), 112 ictl->full_name)) { 113 pr_err("%pOFn: Request mem region failed.\n", ictl); 114 return -EBUSY; 115 } 116 117 reg_base = ioremap(mem.start, resource_size(&mem)); 118 if (!reg_base) { 119 ret = -EBUSY; 120 pr_err("%pOFn: ioremap failed.\n", ictl); 121 goto ioremap_fail; 122 } 123 124 domain = irq_domain_add_linear(ictl, AB_IRQCTL_MAXIRQ, 125 &irq_generic_chip_ops, NULL); 126 if (!domain) { 127 ret = -ENOMEM; 128 pr_err("%pOFn: Could not register interrupt domain.\n", 129 ictl); 130 goto irq_domain_add_fail; 131 } 132 133 ret = irq_alloc_domain_generic_chips(domain, AB_IRQCTL_MAXIRQ, 134 2, ictl->name, handle_level_irq, 135 IRQ_NOREQUEST, IRQ_NOPROBE, 136 IRQ_GC_INIT_MASK_CACHE); 137 if (ret) { 138 pr_err("%pOFn: Could not allocate generic interrupt chip.\n", 139 ictl); 140 goto gc_alloc_fail; 141 } 142 143 gc = domain->gc->gc[0]; 144 gc->reg_base = reg_base; 145 146 gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK; 147 gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit; 148 gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit; 149 gc->chip_types[0].chip.irq_set_type = tb10x_irq_set_type; 150 gc->chip_types[0].regs.mask = AB_IRQCTL_INT_ENABLE; 151 152 gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH; 153 gc->chip_types[1].chip.name = gc->chip_types[0].chip.name; 154 gc->chip_types[1].chip.irq_ack = irq_gc_ack_set_bit; 155 gc->chip_types[1].chip.irq_mask = irq_gc_mask_clr_bit; 156 gc->chip_types[1].chip.irq_unmask = irq_gc_mask_set_bit; 157 gc->chip_types[1].chip.irq_set_type = tb10x_irq_set_type; 158 gc->chip_types[1].regs.ack = AB_IRQCTL_INT_STATUS; 159 gc->chip_types[1].regs.mask = AB_IRQCTL_INT_ENABLE; 160 gc->chip_types[1].handler = handle_edge_irq; 161 162 for (i = 0; i < nrirqs; i++) { 163 unsigned int irq = irq_of_parse_and_map(ictl, i); 164 165 irq_set_chained_handler_and_data(irq, tb10x_irq_cascade, 166 domain); 167 } 168 169 ab_irqctl_writereg(gc, AB_IRQCTL_INT_ENABLE, 0); 170 ab_irqctl_writereg(gc, AB_IRQCTL_INT_MODE, 0); 171 ab_irqctl_writereg(gc, AB_IRQCTL_INT_POLARITY, 0); 172 ab_irqctl_writereg(gc, AB_IRQCTL_INT_STATUS, ~0UL); 173 174 return 0; 175 176 gc_alloc_fail: 177 irq_domain_remove(domain); 178 irq_domain_add_fail: 179 iounmap(reg_base); 180 ioremap_fail: 181 release_mem_region(mem.start, resource_size(&mem)); 182 return ret; 183 } 184 IRQCHIP_DECLARE(tb10x_intc, "abilis,tb10x-ictl", of_tb10x_init_irq); 185