1 /* 2 * Atmel AT91 AIC (Advanced Interrupt Controller) driver 3 * 4 * Copyright (C) 2004 SAN People 5 * Copyright (C) 2004 ATMEL 6 * Copyright (C) Rick Bronson 7 * Copyright (C) 2014 Free Electrons 8 * 9 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com> 10 * 11 * This file is licensed under the terms of the GNU General Public 12 * License version 2. This program is licensed "as is" without any 13 * warranty of any kind, whether express or implied. 14 */ 15 16 #include <linux/init.h> 17 #include <linux/module.h> 18 #include <linux/mm.h> 19 #include <linux/bitmap.h> 20 #include <linux/types.h> 21 #include <linux/irq.h> 22 #include <linux/irqchip.h> 23 #include <linux/of.h> 24 #include <linux/of_address.h> 25 #include <linux/of_irq.h> 26 #include <linux/irqdomain.h> 27 #include <linux/err.h> 28 #include <linux/slab.h> 29 #include <linux/io.h> 30 31 #include <asm/exception.h> 32 #include <asm/mach/irq.h> 33 34 #include "irq-atmel-aic-common.h" 35 36 /* Number of irq lines managed by AIC */ 37 #define NR_AIC_IRQS 32 38 39 #define AT91_AIC_SMR(n) ((n) * 4) 40 41 #define AT91_AIC_SVR(n) (0x80 + ((n) * 4)) 42 #define AT91_AIC_IVR 0x100 43 #define AT91_AIC_FVR 0x104 44 #define AT91_AIC_ISR 0x108 45 46 #define AT91_AIC_IPR 0x10c 47 #define AT91_AIC_IMR 0x110 48 #define AT91_AIC_CISR 0x114 49 50 #define AT91_AIC_IECR 0x120 51 #define AT91_AIC_IDCR 0x124 52 #define AT91_AIC_ICCR 0x128 53 #define AT91_AIC_ISCR 0x12c 54 #define AT91_AIC_EOICR 0x130 55 #define AT91_AIC_SPU 0x134 56 #define AT91_AIC_DCR 0x138 57 58 static struct irq_domain *aic_domain; 59 60 static asmlinkage void __exception_irq_entry 61 aic_handle(struct pt_regs *regs) 62 { 63 struct irq_domain_chip_generic *dgc = aic_domain->gc; 64 struct irq_chip_generic *gc = dgc->gc[0]; 65 u32 irqnr; 66 u32 irqstat; 67 68 irqnr = irq_reg_readl(gc, AT91_AIC_IVR); 69 irqstat = irq_reg_readl(gc, AT91_AIC_ISR); 70 71 if (!irqstat) 72 irq_reg_writel(gc, 0, AT91_AIC_EOICR); 73 else 74 generic_handle_domain_irq(aic_domain, irqnr); 75 } 76 77 static int aic_retrigger(struct irq_data *d) 78 { 79 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 80 81 /* Enable interrupt on AIC5 */ 82 irq_gc_lock(gc); 83 irq_reg_writel(gc, d->mask, AT91_AIC_ISCR); 84 irq_gc_unlock(gc); 85 86 return 1; 87 } 88 89 static int aic_set_type(struct irq_data *d, unsigned type) 90 { 91 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 92 unsigned int smr; 93 int ret; 94 95 smr = irq_reg_readl(gc, AT91_AIC_SMR(d->hwirq)); 96 ret = aic_common_set_type(d, type, &smr); 97 if (ret) 98 return ret; 99 100 irq_reg_writel(gc, smr, AT91_AIC_SMR(d->hwirq)); 101 102 return 0; 103 } 104 105 #ifdef CONFIG_PM 106 static void aic_suspend(struct irq_data *d) 107 { 108 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 109 110 irq_gc_lock(gc); 111 irq_reg_writel(gc, gc->mask_cache, AT91_AIC_IDCR); 112 irq_reg_writel(gc, gc->wake_active, AT91_AIC_IECR); 113 irq_gc_unlock(gc); 114 } 115 116 static void aic_resume(struct irq_data *d) 117 { 118 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 119 120 irq_gc_lock(gc); 121 irq_reg_writel(gc, gc->wake_active, AT91_AIC_IDCR); 122 irq_reg_writel(gc, gc->mask_cache, AT91_AIC_IECR); 123 irq_gc_unlock(gc); 124 } 125 126 static void aic_pm_shutdown(struct irq_data *d) 127 { 128 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 129 130 irq_gc_lock(gc); 131 irq_reg_writel(gc, 0xffffffff, AT91_AIC_IDCR); 132 irq_reg_writel(gc, 0xffffffff, AT91_AIC_ICCR); 133 irq_gc_unlock(gc); 134 } 135 #else 136 #define aic_suspend NULL 137 #define aic_resume NULL 138 #define aic_pm_shutdown NULL 139 #endif /* CONFIG_PM */ 140 141 static void __init aic_hw_init(struct irq_domain *domain) 142 { 143 struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0); 144 int i; 145 146 /* 147 * Perform 8 End Of Interrupt Command to make sure AIC 148 * will not Lock out nIRQ 149 */ 150 for (i = 0; i < 8; i++) 151 irq_reg_writel(gc, 0, AT91_AIC_EOICR); 152 153 /* 154 * Spurious Interrupt ID in Spurious Vector Register. 155 * When there is no current interrupt, the IRQ Vector Register 156 * reads the value stored in AIC_SPU 157 */ 158 irq_reg_writel(gc, 0xffffffff, AT91_AIC_SPU); 159 160 /* No debugging in AIC: Debug (Protect) Control Register */ 161 irq_reg_writel(gc, 0, AT91_AIC_DCR); 162 163 /* Disable and clear all interrupts initially */ 164 irq_reg_writel(gc, 0xffffffff, AT91_AIC_IDCR); 165 irq_reg_writel(gc, 0xffffffff, AT91_AIC_ICCR); 166 167 for (i = 0; i < 32; i++) 168 irq_reg_writel(gc, i, AT91_AIC_SVR(i)); 169 } 170 171 static int aic_irq_domain_xlate(struct irq_domain *d, 172 struct device_node *ctrlr, 173 const u32 *intspec, unsigned int intsize, 174 irq_hw_number_t *out_hwirq, 175 unsigned int *out_type) 176 { 177 struct irq_domain_chip_generic *dgc = d->gc; 178 struct irq_chip_generic *gc; 179 unsigned long flags; 180 unsigned smr; 181 int idx; 182 int ret; 183 184 if (!dgc) 185 return -EINVAL; 186 187 ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize, 188 out_hwirq, out_type); 189 if (ret) 190 return ret; 191 192 idx = intspec[0] / dgc->irqs_per_chip; 193 if (idx >= dgc->num_chips) 194 return -EINVAL; 195 196 gc = dgc->gc[idx]; 197 198 irq_gc_lock_irqsave(gc, flags); 199 smr = irq_reg_readl(gc, AT91_AIC_SMR(*out_hwirq)); 200 aic_common_set_priority(intspec[2], &smr); 201 irq_reg_writel(gc, smr, AT91_AIC_SMR(*out_hwirq)); 202 irq_gc_unlock_irqrestore(gc, flags); 203 204 return ret; 205 } 206 207 static const struct irq_domain_ops aic_irq_ops = { 208 .map = irq_map_generic_chip, 209 .xlate = aic_irq_domain_xlate, 210 }; 211 212 static void __init at91rm9200_aic_irq_fixup(void) 213 { 214 aic_common_rtc_irq_fixup(); 215 } 216 217 static void __init at91sam9260_aic_irq_fixup(void) 218 { 219 aic_common_rtt_irq_fixup(); 220 } 221 222 static void __init at91sam9g45_aic_irq_fixup(void) 223 { 224 aic_common_rtc_irq_fixup(); 225 aic_common_rtt_irq_fixup(); 226 } 227 228 static const struct of_device_id aic_irq_fixups[] __initconst = { 229 { .compatible = "atmel,at91rm9200", .data = at91rm9200_aic_irq_fixup }, 230 { .compatible = "atmel,at91sam9g45", .data = at91sam9g45_aic_irq_fixup }, 231 { .compatible = "atmel,at91sam9n12", .data = at91rm9200_aic_irq_fixup }, 232 { .compatible = "atmel,at91sam9rl", .data = at91sam9g45_aic_irq_fixup }, 233 { .compatible = "atmel,at91sam9x5", .data = at91rm9200_aic_irq_fixup }, 234 { .compatible = "atmel,at91sam9260", .data = at91sam9260_aic_irq_fixup }, 235 { .compatible = "atmel,at91sam9261", .data = at91sam9260_aic_irq_fixup }, 236 { .compatible = "atmel,at91sam9263", .data = at91sam9260_aic_irq_fixup }, 237 { .compatible = "atmel,at91sam9g20", .data = at91sam9260_aic_irq_fixup }, 238 { /* sentinel */ }, 239 }; 240 241 static int __init aic_of_init(struct device_node *node, 242 struct device_node *parent) 243 { 244 struct irq_chip_generic *gc; 245 struct irq_domain *domain; 246 247 if (aic_domain) 248 return -EEXIST; 249 250 domain = aic_common_of_init(node, &aic_irq_ops, "atmel-aic", 251 NR_AIC_IRQS, aic_irq_fixups); 252 if (IS_ERR(domain)) 253 return PTR_ERR(domain); 254 255 aic_domain = domain; 256 gc = irq_get_domain_generic_chip(domain, 0); 257 258 gc->chip_types[0].regs.eoi = AT91_AIC_EOICR; 259 gc->chip_types[0].regs.enable = AT91_AIC_IECR; 260 gc->chip_types[0].regs.disable = AT91_AIC_IDCR; 261 gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg; 262 gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg; 263 gc->chip_types[0].chip.irq_retrigger = aic_retrigger; 264 gc->chip_types[0].chip.irq_set_type = aic_set_type; 265 gc->chip_types[0].chip.irq_suspend = aic_suspend; 266 gc->chip_types[0].chip.irq_resume = aic_resume; 267 gc->chip_types[0].chip.irq_pm_shutdown = aic_pm_shutdown; 268 269 aic_hw_init(domain); 270 set_handle_irq(aic_handle); 271 272 return 0; 273 } 274 IRQCHIP_DECLARE(at91rm9200_aic, "atmel,at91rm9200-aic", aic_of_init); 275