1 /* 2 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> 3 * JZ4740 platform IRQ support 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License as published by the 7 * Free Software Foundation; either version 2 of the License, or (at your 8 * option) any later version. 9 * 10 * You should have received a copy of the GNU General Public License along 11 * with this program; if not, write to the Free Software Foundation, Inc., 12 * 675 Mass Ave, Cambridge, MA 02139, USA. 13 * 14 */ 15 16 #include <linux/errno.h> 17 #include <linux/init.h> 18 #include <linux/types.h> 19 #include <linux/interrupt.h> 20 #include <linux/ioport.h> 21 #include <linux/irqchip.h> 22 #include <linux/irqchip/ingenic.h> 23 #include <linux/of_address.h> 24 #include <linux/of_irq.h> 25 #include <linux/timex.h> 26 #include <linux/slab.h> 27 #include <linux/delay.h> 28 29 #include <asm/io.h> 30 #include <asm/mach-jz4740/irq.h> 31 32 struct ingenic_intc_data { 33 void __iomem *base; 34 unsigned num_chips; 35 }; 36 37 #define JZ_REG_INTC_STATUS 0x00 38 #define JZ_REG_INTC_MASK 0x04 39 #define JZ_REG_INTC_SET_MASK 0x08 40 #define JZ_REG_INTC_CLEAR_MASK 0x0c 41 #define JZ_REG_INTC_PENDING 0x10 42 #define CHIP_SIZE 0x20 43 44 static irqreturn_t intc_cascade(int irq, void *data) 45 { 46 struct ingenic_intc_data *intc = irq_get_handler_data(irq); 47 uint32_t irq_reg; 48 unsigned i; 49 50 for (i = 0; i < intc->num_chips; i++) { 51 irq_reg = readl(intc->base + (i * CHIP_SIZE) + 52 JZ_REG_INTC_PENDING); 53 if (!irq_reg) 54 continue; 55 56 generic_handle_irq(__fls(irq_reg) + (i * 32) + JZ4740_IRQ_BASE); 57 } 58 59 return IRQ_HANDLED; 60 } 61 62 static void intc_irq_set_mask(struct irq_chip_generic *gc, uint32_t mask) 63 { 64 struct irq_chip_regs *regs = &gc->chip_types->regs; 65 66 writel(mask, gc->reg_base + regs->enable); 67 writel(~mask, gc->reg_base + regs->disable); 68 } 69 70 void ingenic_intc_irq_suspend(struct irq_data *data) 71 { 72 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); 73 intc_irq_set_mask(gc, gc->wake_active); 74 } 75 76 void ingenic_intc_irq_resume(struct irq_data *data) 77 { 78 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); 79 intc_irq_set_mask(gc, gc->mask_cache); 80 } 81 82 static struct irqaction intc_cascade_action = { 83 .handler = intc_cascade, 84 .name = "SoC intc cascade interrupt", 85 }; 86 87 static int __init ingenic_intc_of_init(struct device_node *node, 88 unsigned num_chips) 89 { 90 struct ingenic_intc_data *intc; 91 struct irq_chip_generic *gc; 92 struct irq_chip_type *ct; 93 struct irq_domain *domain; 94 int parent_irq, err = 0; 95 unsigned i; 96 97 intc = kzalloc(sizeof(*intc), GFP_KERNEL); 98 if (!intc) { 99 err = -ENOMEM; 100 goto out_err; 101 } 102 103 parent_irq = irq_of_parse_and_map(node, 0); 104 if (!parent_irq) { 105 err = -EINVAL; 106 goto out_free; 107 } 108 109 err = irq_set_handler_data(parent_irq, intc); 110 if (err) 111 goto out_unmap_irq; 112 113 intc->num_chips = num_chips; 114 intc->base = of_iomap(node, 0); 115 if (!intc->base) { 116 err = -ENODEV; 117 goto out_unmap_irq; 118 } 119 120 for (i = 0; i < num_chips; i++) { 121 /* Mask all irqs */ 122 writel(0xffffffff, intc->base + (i * CHIP_SIZE) + 123 JZ_REG_INTC_SET_MASK); 124 125 gc = irq_alloc_generic_chip("INTC", 1, 126 JZ4740_IRQ_BASE + (i * 32), 127 intc->base + (i * CHIP_SIZE), 128 handle_level_irq); 129 130 gc->wake_enabled = IRQ_MSK(32); 131 132 ct = gc->chip_types; 133 ct->regs.enable = JZ_REG_INTC_CLEAR_MASK; 134 ct->regs.disable = JZ_REG_INTC_SET_MASK; 135 ct->chip.irq_unmask = irq_gc_unmask_enable_reg; 136 ct->chip.irq_mask = irq_gc_mask_disable_reg; 137 ct->chip.irq_mask_ack = irq_gc_mask_disable_reg; 138 ct->chip.irq_set_wake = irq_gc_set_wake; 139 ct->chip.irq_suspend = ingenic_intc_irq_suspend; 140 ct->chip.irq_resume = ingenic_intc_irq_resume; 141 142 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, 0, 143 IRQ_NOPROBE | IRQ_LEVEL); 144 } 145 146 domain = irq_domain_add_legacy(node, num_chips * 32, JZ4740_IRQ_BASE, 0, 147 &irq_domain_simple_ops, NULL); 148 if (!domain) 149 pr_warn("unable to register IRQ domain\n"); 150 151 setup_irq(parent_irq, &intc_cascade_action); 152 return 0; 153 154 out_unmap_irq: 155 irq_dispose_mapping(parent_irq); 156 out_free: 157 kfree(intc); 158 out_err: 159 return err; 160 } 161 162 static int __init intc_1chip_of_init(struct device_node *node, 163 struct device_node *parent) 164 { 165 return ingenic_intc_of_init(node, 1); 166 } 167 IRQCHIP_DECLARE(jz4740_intc, "ingenic,jz4740-intc", intc_1chip_of_init); 168 169 static int __init intc_2chip_of_init(struct device_node *node, 170 struct device_node *parent) 171 { 172 return ingenic_intc_of_init(node, 2); 173 } 174 IRQCHIP_DECLARE(jz4770_intc, "ingenic,jz4770-intc", intc_2chip_of_init); 175 IRQCHIP_DECLARE(jz4775_intc, "ingenic,jz4775-intc", intc_2chip_of_init); 176 IRQCHIP_DECLARE(jz4780_intc, "ingenic,jz4780-intc", intc_2chip_of_init); 177