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/irqchip.h> 15 #include <linux/irqdomain.h> 16 #include <linux/of_address.h> 17 #include <linux/of_irq.h> 18 #include <linux/slab.h> 19 20 #include <asm/exception.h> 21 #include <asm/mach/irq.h> 22 23 #define CLPS711X_INTSR1 (0x0240) 24 #define CLPS711X_INTMR1 (0x0280) 25 #define CLPS711X_BLEOI (0x0600) 26 #define CLPS711X_MCEOI (0x0640) 27 #define CLPS711X_TEOI (0x0680) 28 #define CLPS711X_TC1EOI (0x06c0) 29 #define CLPS711X_TC2EOI (0x0700) 30 #define CLPS711X_RTCEOI (0x0740) 31 #define CLPS711X_UMSEOI (0x0780) 32 #define CLPS711X_COEOI (0x07c0) 33 #define CLPS711X_INTSR2 (0x1240) 34 #define CLPS711X_INTMR2 (0x1280) 35 #define CLPS711X_SRXEOF (0x1600) 36 #define CLPS711X_KBDEOI (0x1700) 37 #define CLPS711X_INTSR3 (0x2240) 38 #define CLPS711X_INTMR3 (0x2280) 39 40 static const struct { 41 #define CLPS711X_FLAG_EN (1 << 0) 42 #define CLPS711X_FLAG_FIQ (1 << 1) 43 unsigned int flags; 44 phys_addr_t eoi; 45 } clps711x_irqs[] = { 46 [1] = { CLPS711X_FLAG_FIQ, CLPS711X_BLEOI, }, 47 [3] = { CLPS711X_FLAG_FIQ, CLPS711X_MCEOI, }, 48 [4] = { CLPS711X_FLAG_EN, CLPS711X_COEOI, }, 49 [5] = { CLPS711X_FLAG_EN, }, 50 [6] = { CLPS711X_FLAG_EN, }, 51 [7] = { CLPS711X_FLAG_EN, }, 52 [8] = { CLPS711X_FLAG_EN, CLPS711X_TC1EOI, }, 53 [9] = { CLPS711X_FLAG_EN, CLPS711X_TC2EOI, }, 54 [10] = { CLPS711X_FLAG_EN, CLPS711X_RTCEOI, }, 55 [11] = { CLPS711X_FLAG_EN, CLPS711X_TEOI, }, 56 [12] = { CLPS711X_FLAG_EN, }, 57 [13] = { CLPS711X_FLAG_EN, }, 58 [14] = { CLPS711X_FLAG_EN, CLPS711X_UMSEOI, }, 59 [15] = { CLPS711X_FLAG_EN, CLPS711X_SRXEOF, }, 60 [16] = { CLPS711X_FLAG_EN, CLPS711X_KBDEOI, }, 61 [17] = { CLPS711X_FLAG_EN, }, 62 [18] = { CLPS711X_FLAG_EN, }, 63 [28] = { CLPS711X_FLAG_EN, }, 64 [29] = { CLPS711X_FLAG_EN, }, 65 [32] = { CLPS711X_FLAG_FIQ, }, 66 }; 67 68 static struct { 69 void __iomem *base; 70 void __iomem *intmr[3]; 71 void __iomem *intsr[3]; 72 struct irq_domain *domain; 73 struct irq_domain_ops ops; 74 } *clps711x_intc; 75 76 static asmlinkage void __exception_irq_entry clps711x_irqh(struct pt_regs *regs) 77 { 78 u32 irqstat; 79 80 do { 81 irqstat = readw_relaxed(clps711x_intc->intmr[0]) & 82 readw_relaxed(clps711x_intc->intsr[0]); 83 if (irqstat) 84 handle_domain_irq(clps711x_intc->domain, 85 fls(irqstat) - 1, regs); 86 87 irqstat = readw_relaxed(clps711x_intc->intmr[1]) & 88 readw_relaxed(clps711x_intc->intsr[1]); 89 if (irqstat) 90 handle_domain_irq(clps711x_intc->domain, 91 fls(irqstat) - 1 + 16, regs); 92 } while (irqstat); 93 } 94 95 static void clps711x_intc_eoi(struct irq_data *d) 96 { 97 irq_hw_number_t hwirq = irqd_to_hwirq(d); 98 99 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hwirq].eoi); 100 } 101 102 static void clps711x_intc_mask(struct irq_data *d) 103 { 104 irq_hw_number_t hwirq = irqd_to_hwirq(d); 105 void __iomem *intmr = clps711x_intc->intmr[hwirq / 16]; 106 u32 tmp; 107 108 tmp = readl_relaxed(intmr); 109 tmp &= ~(1 << (hwirq % 16)); 110 writel_relaxed(tmp, intmr); 111 } 112 113 static void clps711x_intc_unmask(struct irq_data *d) 114 { 115 irq_hw_number_t hwirq = irqd_to_hwirq(d); 116 void __iomem *intmr = clps711x_intc->intmr[hwirq / 16]; 117 u32 tmp; 118 119 tmp = readl_relaxed(intmr); 120 tmp |= 1 << (hwirq % 16); 121 writel_relaxed(tmp, intmr); 122 } 123 124 static struct irq_chip clps711x_intc_chip = { 125 .name = "clps711x-intc", 126 .irq_eoi = clps711x_intc_eoi, 127 .irq_mask = clps711x_intc_mask, 128 .irq_unmask = clps711x_intc_unmask, 129 }; 130 131 static int __init clps711x_intc_irq_map(struct irq_domain *h, unsigned int virq, 132 irq_hw_number_t hw) 133 { 134 irq_flow_handler_t handler = handle_level_irq; 135 unsigned int flags = 0; 136 137 if (!clps711x_irqs[hw].flags) 138 return 0; 139 140 if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) { 141 handler = handle_bad_irq; 142 flags |= IRQ_NOAUTOEN; 143 } else if (clps711x_irqs[hw].eoi) { 144 handler = handle_fasteoi_irq; 145 } 146 147 /* Clear down pending interrupt */ 148 if (clps711x_irqs[hw].eoi) 149 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hw].eoi); 150 151 irq_set_chip_and_handler(virq, &clps711x_intc_chip, handler); 152 irq_modify_status(virq, IRQ_NOPROBE, flags); 153 154 return 0; 155 } 156 157 static int __init _clps711x_intc_init(struct device_node *np, 158 phys_addr_t base, resource_size_t size) 159 { 160 int err; 161 162 clps711x_intc = kzalloc(sizeof(*clps711x_intc), GFP_KERNEL); 163 if (!clps711x_intc) 164 return -ENOMEM; 165 166 clps711x_intc->base = ioremap(base, size); 167 if (!clps711x_intc->base) { 168 err = -ENOMEM; 169 goto out_kfree; 170 } 171 172 clps711x_intc->intsr[0] = clps711x_intc->base + CLPS711X_INTSR1; 173 clps711x_intc->intmr[0] = clps711x_intc->base + CLPS711X_INTMR1; 174 clps711x_intc->intsr[1] = clps711x_intc->base + CLPS711X_INTSR2; 175 clps711x_intc->intmr[1] = clps711x_intc->base + CLPS711X_INTMR2; 176 clps711x_intc->intsr[2] = clps711x_intc->base + CLPS711X_INTSR3; 177 clps711x_intc->intmr[2] = clps711x_intc->base + CLPS711X_INTMR3; 178 179 /* Mask all interrupts */ 180 writel_relaxed(0, clps711x_intc->intmr[0]); 181 writel_relaxed(0, clps711x_intc->intmr[1]); 182 writel_relaxed(0, clps711x_intc->intmr[2]); 183 184 err = irq_alloc_descs(-1, 0, ARRAY_SIZE(clps711x_irqs), numa_node_id()); 185 if (err < 0) 186 goto out_iounmap; 187 188 clps711x_intc->ops.map = clps711x_intc_irq_map; 189 clps711x_intc->ops.xlate = irq_domain_xlate_onecell; 190 clps711x_intc->domain = 191 irq_domain_add_legacy(np, ARRAY_SIZE(clps711x_irqs), 192 0, 0, &clps711x_intc->ops, NULL); 193 if (!clps711x_intc->domain) { 194 err = -ENOMEM; 195 goto out_irqfree; 196 } 197 198 irq_set_default_host(clps711x_intc->domain); 199 set_handle_irq(clps711x_irqh); 200 201 #ifdef CONFIG_FIQ 202 init_FIQ(0); 203 #endif 204 205 return 0; 206 207 out_irqfree: 208 irq_free_descs(0, ARRAY_SIZE(clps711x_irqs)); 209 210 out_iounmap: 211 iounmap(clps711x_intc->base); 212 213 out_kfree: 214 kfree(clps711x_intc); 215 216 return err; 217 } 218 219 void __init clps711x_intc_init(phys_addr_t base, resource_size_t size) 220 { 221 BUG_ON(_clps711x_intc_init(NULL, base, size)); 222 } 223 224 #ifdef CONFIG_IRQCHIP 225 static int __init clps711x_intc_init_dt(struct device_node *np, 226 struct device_node *parent) 227 { 228 struct resource res; 229 int err; 230 231 err = of_address_to_resource(np, 0, &res); 232 if (err) 233 return err; 234 235 return _clps711x_intc_init(np, res.start, resource_size(&res)); 236 } 237 IRQCHIP_DECLARE(clps711x, "cirrus,ep7209-intc", clps711x_intc_init_dt); 238 #endif 239