1 /* 2 * CLPS711X IRQ driver 3 * 4 * Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/io.h> 13 #include <linux/irq.h> 14 #include <linux/irqdomain.h> 15 #include <linux/of_address.h> 16 #include <linux/of_irq.h> 17 #include <linux/slab.h> 18 19 #include <asm/exception.h> 20 #include <asm/mach/irq.h> 21 22 #include "irqchip.h" 23 24 #define CLPS711X_INTSR1 (0x0240) 25 #define CLPS711X_INTMR1 (0x0280) 26 #define CLPS711X_BLEOI (0x0600) 27 #define CLPS711X_MCEOI (0x0640) 28 #define CLPS711X_TEOI (0x0680) 29 #define CLPS711X_TC1EOI (0x06c0) 30 #define CLPS711X_TC2EOI (0x0700) 31 #define CLPS711X_RTCEOI (0x0740) 32 #define CLPS711X_UMSEOI (0x0780) 33 #define CLPS711X_COEOI (0x07c0) 34 #define CLPS711X_INTSR2 (0x1240) 35 #define CLPS711X_INTMR2 (0x1280) 36 #define CLPS711X_SRXEOF (0x1600) 37 #define CLPS711X_KBDEOI (0x1700) 38 #define CLPS711X_INTSR3 (0x2240) 39 #define CLPS711X_INTMR3 (0x2280) 40 41 static const struct { 42 #define CLPS711X_FLAG_EN (1 << 0) 43 #define CLPS711X_FLAG_FIQ (1 << 1) 44 unsigned int flags; 45 phys_addr_t eoi; 46 } clps711x_irqs[] = { 47 [1] = { CLPS711X_FLAG_FIQ, CLPS711X_BLEOI, }, 48 [3] = { CLPS711X_FLAG_FIQ, CLPS711X_MCEOI, }, 49 [4] = { CLPS711X_FLAG_EN, CLPS711X_COEOI, }, 50 [5] = { CLPS711X_FLAG_EN, }, 51 [6] = { CLPS711X_FLAG_EN, }, 52 [7] = { CLPS711X_FLAG_EN, }, 53 [8] = { CLPS711X_FLAG_EN, CLPS711X_TC1EOI, }, 54 [9] = { CLPS711X_FLAG_EN, CLPS711X_TC2EOI, }, 55 [10] = { CLPS711X_FLAG_EN, CLPS711X_RTCEOI, }, 56 [11] = { CLPS711X_FLAG_EN, CLPS711X_TEOI, }, 57 [12] = { CLPS711X_FLAG_EN, }, 58 [13] = { CLPS711X_FLAG_EN, }, 59 [14] = { CLPS711X_FLAG_EN, CLPS711X_UMSEOI, }, 60 [15] = { CLPS711X_FLAG_EN, CLPS711X_SRXEOF, }, 61 [16] = { CLPS711X_FLAG_EN, CLPS711X_KBDEOI, }, 62 [17] = { CLPS711X_FLAG_EN, }, 63 [18] = { CLPS711X_FLAG_EN, }, 64 [28] = { CLPS711X_FLAG_EN, }, 65 [29] = { CLPS711X_FLAG_EN, }, 66 [32] = { CLPS711X_FLAG_FIQ, }, 67 }; 68 69 static struct { 70 void __iomem *base; 71 void __iomem *intmr[3]; 72 void __iomem *intsr[3]; 73 struct irq_domain *domain; 74 struct irq_domain_ops ops; 75 } *clps711x_intc; 76 77 static asmlinkage void __exception_irq_entry clps711x_irqh(struct pt_regs *regs) 78 { 79 u32 irqstat; 80 81 do { 82 irqstat = readw_relaxed(clps711x_intc->intmr[0]) & 83 readw_relaxed(clps711x_intc->intsr[0]); 84 if (irqstat) 85 handle_domain_irq(clps711x_intc->domain, 86 fls(irqstat) - 1, regs); 87 88 irqstat = readw_relaxed(clps711x_intc->intmr[1]) & 89 readw_relaxed(clps711x_intc->intsr[1]); 90 if (irqstat) 91 handle_domain_irq(clps711x_intc->domain, 92 fls(irqstat) - 1 + 16, regs); 93 } while (irqstat); 94 } 95 96 static void clps711x_intc_eoi(struct irq_data *d) 97 { 98 irq_hw_number_t hwirq = irqd_to_hwirq(d); 99 100 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hwirq].eoi); 101 } 102 103 static void clps711x_intc_mask(struct irq_data *d) 104 { 105 irq_hw_number_t hwirq = irqd_to_hwirq(d); 106 void __iomem *intmr = clps711x_intc->intmr[hwirq / 16]; 107 u32 tmp; 108 109 tmp = readl_relaxed(intmr); 110 tmp &= ~(1 << (hwirq % 16)); 111 writel_relaxed(tmp, intmr); 112 } 113 114 static void clps711x_intc_unmask(struct irq_data *d) 115 { 116 irq_hw_number_t hwirq = irqd_to_hwirq(d); 117 void __iomem *intmr = clps711x_intc->intmr[hwirq / 16]; 118 u32 tmp; 119 120 tmp = readl_relaxed(intmr); 121 tmp |= 1 << (hwirq % 16); 122 writel_relaxed(tmp, intmr); 123 } 124 125 static struct irq_chip clps711x_intc_chip = { 126 .name = "clps711x-intc", 127 .irq_eoi = clps711x_intc_eoi, 128 .irq_mask = clps711x_intc_mask, 129 .irq_unmask = clps711x_intc_unmask, 130 }; 131 132 static int __init clps711x_intc_irq_map(struct irq_domain *h, unsigned int virq, 133 irq_hw_number_t hw) 134 { 135 irq_flow_handler_t handler = handle_level_irq; 136 unsigned int flags = IRQF_VALID | IRQF_PROBE; 137 138 if (!clps711x_irqs[hw].flags) 139 return 0; 140 141 if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) { 142 handler = handle_bad_irq; 143 flags |= IRQF_NOAUTOEN; 144 } else if (clps711x_irqs[hw].eoi) { 145 handler = handle_fasteoi_irq; 146 } 147 148 /* Clear down pending interrupt */ 149 if (clps711x_irqs[hw].eoi) 150 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hw].eoi); 151 152 irq_set_chip_and_handler(virq, &clps711x_intc_chip, handler); 153 set_irq_flags(virq, flags); 154 155 return 0; 156 } 157 158 static int __init _clps711x_intc_init(struct device_node *np, 159 phys_addr_t base, resource_size_t size) 160 { 161 int err; 162 163 clps711x_intc = kzalloc(sizeof(*clps711x_intc), GFP_KERNEL); 164 if (!clps711x_intc) 165 return -ENOMEM; 166 167 clps711x_intc->base = ioremap(base, size); 168 if (!clps711x_intc->base) { 169 err = -ENOMEM; 170 goto out_kfree; 171 } 172 173 clps711x_intc->intsr[0] = clps711x_intc->base + CLPS711X_INTSR1; 174 clps711x_intc->intmr[0] = clps711x_intc->base + CLPS711X_INTMR1; 175 clps711x_intc->intsr[1] = clps711x_intc->base + CLPS711X_INTSR2; 176 clps711x_intc->intmr[1] = clps711x_intc->base + CLPS711X_INTMR2; 177 clps711x_intc->intsr[2] = clps711x_intc->base + CLPS711X_INTSR3; 178 clps711x_intc->intmr[2] = clps711x_intc->base + CLPS711X_INTMR3; 179 180 /* Mask all interrupts */ 181 writel_relaxed(0, clps711x_intc->intmr[0]); 182 writel_relaxed(0, clps711x_intc->intmr[1]); 183 writel_relaxed(0, clps711x_intc->intmr[2]); 184 185 err = irq_alloc_descs(-1, 0, ARRAY_SIZE(clps711x_irqs), numa_node_id()); 186 if (IS_ERR_VALUE(err)) 187 goto out_iounmap; 188 189 clps711x_intc->ops.map = clps711x_intc_irq_map; 190 clps711x_intc->ops.xlate = irq_domain_xlate_onecell; 191 clps711x_intc->domain = 192 irq_domain_add_legacy(np, ARRAY_SIZE(clps711x_irqs), 193 0, 0, &clps711x_intc->ops, NULL); 194 if (!clps711x_intc->domain) { 195 err = -ENOMEM; 196 goto out_irqfree; 197 } 198 199 irq_set_default_host(clps711x_intc->domain); 200 set_handle_irq(clps711x_irqh); 201 202 #ifdef CONFIG_FIQ 203 init_FIQ(0); 204 #endif 205 206 return 0; 207 208 out_irqfree: 209 irq_free_descs(0, ARRAY_SIZE(clps711x_irqs)); 210 211 out_iounmap: 212 iounmap(clps711x_intc->base); 213 214 out_kfree: 215 kfree(clps711x_intc); 216 217 return err; 218 } 219 220 void __init clps711x_intc_init(phys_addr_t base, resource_size_t size) 221 { 222 BUG_ON(_clps711x_intc_init(NULL, base, size)); 223 } 224 225 #ifdef CONFIG_IRQCHIP 226 static int __init clps711x_intc_init_dt(struct device_node *np, 227 struct device_node *parent) 228 { 229 struct resource res; 230 int err; 231 232 err = of_address_to_resource(np, 0, &res); 233 if (err) 234 return err; 235 236 return _clps711x_intc_init(np, res.start, resource_size(&res)); 237 } 238 IRQCHIP_DECLARE(clps711x, "cirrus,clps711x-intc", clps711x_intc_init_dt); 239 #endif 240