1 // SPDX-License-Identifier: (GPL-2.0 OR MIT) 2 /* 3 * Microsemi Ocelot IRQ controller driver 4 * 5 * Copyright (c) 2017 Microsemi Corporation 6 */ 7 #include <linux/bitops.h> 8 #include <linux/irq.h> 9 #include <linux/of_address.h> 10 #include <linux/of_irq.h> 11 #include <linux/irqchip.h> 12 #include <linux/irqchip/chained_irq.h> 13 #include <linux/interrupt.h> 14 15 #define ICPU_CFG_INTR_DST_INTR_IDENT(_p, x) ((_p)->reg_off_ident + 0x4 * (x)) 16 #define ICPU_CFG_INTR_INTR_TRIGGER(_p, x) ((_p)->reg_off_trigger + 0x4 * (x)) 17 18 #define FLAGS_HAS_TRIGGER BIT(0) 19 #define FLAGS_NEED_INIT_ENABLE BIT(1) 20 21 struct chip_props { 22 u8 flags; 23 u8 reg_off_sticky; 24 u8 reg_off_ena; 25 u8 reg_off_ena_clr; 26 u8 reg_off_ena_set; 27 u8 reg_off_ident; 28 u8 reg_off_trigger; 29 u8 reg_off_ena_irq0; 30 u8 n_irq; 31 }; 32 33 static struct chip_props ocelot_props = { 34 .flags = FLAGS_HAS_TRIGGER, 35 .reg_off_sticky = 0x10, 36 .reg_off_ena = 0x18, 37 .reg_off_ena_clr = 0x1c, 38 .reg_off_ena_set = 0x20, 39 .reg_off_ident = 0x38, 40 .reg_off_trigger = 0x5c, 41 .n_irq = 24, 42 }; 43 44 static struct chip_props serval_props = { 45 .flags = FLAGS_HAS_TRIGGER, 46 .reg_off_sticky = 0xc, 47 .reg_off_ena = 0x14, 48 .reg_off_ena_clr = 0x18, 49 .reg_off_ena_set = 0x1c, 50 .reg_off_ident = 0x20, 51 .reg_off_trigger = 0x4, 52 .n_irq = 24, 53 }; 54 55 static struct chip_props luton_props = { 56 .flags = FLAGS_NEED_INIT_ENABLE, 57 .reg_off_sticky = 0, 58 .reg_off_ena = 0x4, 59 .reg_off_ena_clr = 0x8, 60 .reg_off_ena_set = 0xc, 61 .reg_off_ident = 0x18, 62 .reg_off_ena_irq0 = 0x14, 63 .n_irq = 28, 64 }; 65 66 static struct chip_props jaguar2_props = { 67 .flags = FLAGS_HAS_TRIGGER, 68 .reg_off_sticky = 0x10, 69 .reg_off_ena = 0x18, 70 .reg_off_ena_clr = 0x1c, 71 .reg_off_ena_set = 0x20, 72 .reg_off_ident = 0x38, 73 .reg_off_trigger = 0x5c, 74 .n_irq = 29, 75 }; 76 77 static void ocelot_irq_unmask(struct irq_data *data) 78 { 79 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); 80 struct irq_domain *d = data->domain; 81 struct chip_props *p = d->host_data; 82 struct irq_chip_type *ct = irq_data_get_chip_type(data); 83 unsigned int mask = data->mask; 84 u32 val; 85 86 irq_gc_lock(gc); 87 val = irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(p, 0)) | 88 irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(p, 1)); 89 if (!(val & mask)) 90 irq_reg_writel(gc, mask, p->reg_off_sticky); 91 92 *ct->mask_cache &= ~mask; 93 irq_reg_writel(gc, mask, p->reg_off_ena_set); 94 irq_gc_unlock(gc); 95 } 96 97 static void ocelot_irq_handler(struct irq_desc *desc) 98 { 99 struct irq_chip *chip = irq_desc_get_chip(desc); 100 struct irq_domain *d = irq_desc_get_handler_data(desc); 101 struct chip_props *p = d->host_data; 102 struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, 0); 103 u32 reg = irq_reg_readl(gc, ICPU_CFG_INTR_DST_INTR_IDENT(p, 0)); 104 105 chained_irq_enter(chip, desc); 106 107 while (reg) { 108 u32 hwirq = __fls(reg); 109 110 generic_handle_irq(irq_find_mapping(d, hwirq)); 111 reg &= ~(BIT(hwirq)); 112 } 113 114 chained_irq_exit(chip, desc); 115 } 116 117 static int __init vcoreiii_irq_init(struct device_node *node, 118 struct device_node *parent, 119 struct chip_props *p) 120 { 121 struct irq_domain *domain; 122 struct irq_chip_generic *gc; 123 int parent_irq, ret; 124 125 parent_irq = irq_of_parse_and_map(node, 0); 126 if (!parent_irq) 127 return -EINVAL; 128 129 domain = irq_domain_add_linear(node, p->n_irq, 130 &irq_generic_chip_ops, NULL); 131 if (!domain) { 132 pr_err("%pOFn: unable to add irq domain\n", node); 133 return -ENOMEM; 134 } 135 136 ret = irq_alloc_domain_generic_chips(domain, p->n_irq, 1, 137 "icpu", handle_level_irq, 138 0, 0, 0); 139 if (ret) { 140 pr_err("%pOFn: unable to alloc irq domain gc\n", node); 141 goto err_domain_remove; 142 } 143 144 gc = irq_get_domain_generic_chip(domain, 0); 145 gc->reg_base = of_iomap(node, 0); 146 if (!gc->reg_base) { 147 pr_err("%pOFn: unable to map resource\n", node); 148 ret = -ENOMEM; 149 goto err_gc_free; 150 } 151 152 gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit; 153 gc->chip_types[0].regs.ack = p->reg_off_sticky; 154 if (p->flags & FLAGS_HAS_TRIGGER) { 155 gc->chip_types[0].regs.mask = p->reg_off_ena_clr; 156 gc->chip_types[0].chip.irq_unmask = ocelot_irq_unmask; 157 gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit; 158 } else { 159 gc->chip_types[0].regs.enable = p->reg_off_ena_set; 160 gc->chip_types[0].regs.disable = p->reg_off_ena_clr; 161 gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg; 162 gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg; 163 } 164 165 /* Mask and ack all interrupts */ 166 irq_reg_writel(gc, 0, p->reg_off_ena); 167 irq_reg_writel(gc, 0xffffffff, p->reg_off_sticky); 168 169 /* Overall init */ 170 if (p->flags & FLAGS_NEED_INIT_ENABLE) 171 irq_reg_writel(gc, BIT(0), p->reg_off_ena_irq0); 172 173 domain->host_data = p; 174 irq_set_chained_handler_and_data(parent_irq, ocelot_irq_handler, 175 domain); 176 177 return 0; 178 179 err_gc_free: 180 irq_free_generic_chip(gc); 181 182 err_domain_remove: 183 irq_domain_remove(domain); 184 185 return ret; 186 } 187 188 static int __init ocelot_irq_init(struct device_node *node, 189 struct device_node *parent) 190 { 191 return vcoreiii_irq_init(node, parent, &ocelot_props); 192 } 193 194 IRQCHIP_DECLARE(ocelot_icpu, "mscc,ocelot-icpu-intr", ocelot_irq_init); 195 196 static int __init serval_irq_init(struct device_node *node, 197 struct device_node *parent) 198 { 199 return vcoreiii_irq_init(node, parent, &serval_props); 200 } 201 202 IRQCHIP_DECLARE(serval_icpu, "mscc,serval-icpu-intr", serval_irq_init); 203 204 static int __init luton_irq_init(struct device_node *node, 205 struct device_node *parent) 206 { 207 return vcoreiii_irq_init(node, parent, &luton_props); 208 } 209 210 IRQCHIP_DECLARE(luton_icpu, "mscc,luton-icpu-intr", luton_irq_init); 211 212 static int __init jaguar2_irq_init(struct device_node *node, 213 struct device_node *parent) 214 { 215 return vcoreiii_irq_init(node, parent, &jaguar2_props); 216 } 217 218 IRQCHIP_DECLARE(jaguar2_icpu, "mscc,jaguar2-icpu-intr", jaguar2_irq_init); 219