1 /* 2 * Atmel AT91 AIC5 (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/of.h> 23 #include <linux/of_address.h> 24 #include <linux/of_irq.h> 25 #include <linux/irqdomain.h> 26 #include <linux/err.h> 27 #include <linux/slab.h> 28 #include <linux/io.h> 29 30 #include <asm/exception.h> 31 #include <asm/mach/irq.h> 32 33 #include "irq-atmel-aic-common.h" 34 #include "irqchip.h" 35 36 /* Number of irq lines managed by AIC */ 37 #define NR_AIC5_IRQS 128 38 39 #define AT91_AIC5_SSR 0x0 40 #define AT91_AIC5_INTSEL_MSK (0x7f << 0) 41 42 #define AT91_AIC5_SMR 0x4 43 44 #define AT91_AIC5_SVR 0x8 45 #define AT91_AIC5_IVR 0x10 46 #define AT91_AIC5_FVR 0x14 47 #define AT91_AIC5_ISR 0x18 48 49 #define AT91_AIC5_IPR0 0x20 50 #define AT91_AIC5_IPR1 0x24 51 #define AT91_AIC5_IPR2 0x28 52 #define AT91_AIC5_IPR3 0x2c 53 #define AT91_AIC5_IMR 0x30 54 #define AT91_AIC5_CISR 0x34 55 56 #define AT91_AIC5_IECR 0x40 57 #define AT91_AIC5_IDCR 0x44 58 #define AT91_AIC5_ICCR 0x48 59 #define AT91_AIC5_ISCR 0x4c 60 #define AT91_AIC5_EOICR 0x38 61 #define AT91_AIC5_SPU 0x3c 62 #define AT91_AIC5_DCR 0x6c 63 64 #define AT91_AIC5_FFER 0x50 65 #define AT91_AIC5_FFDR 0x54 66 #define AT91_AIC5_FFSR 0x58 67 68 static struct irq_domain *aic5_domain; 69 70 static asmlinkage void __exception_irq_entry 71 aic5_handle(struct pt_regs *regs) 72 { 73 struct irq_domain_chip_generic *dgc = aic5_domain->gc; 74 struct irq_chip_generic *gc = dgc->gc[0]; 75 u32 irqnr; 76 u32 irqstat; 77 78 irqnr = irq_reg_readl(gc->reg_base + AT91_AIC5_IVR); 79 irqstat = irq_reg_readl(gc->reg_base + AT91_AIC5_ISR); 80 81 if (!irqstat) 82 irq_reg_writel(0, gc->reg_base + AT91_AIC5_EOICR); 83 else 84 handle_domain_irq(aic5_domain, irqnr, regs); 85 } 86 87 static void aic5_mask(struct irq_data *d) 88 { 89 struct irq_domain *domain = d->domain; 90 struct irq_domain_chip_generic *dgc = domain->gc; 91 struct irq_chip_generic *gc = dgc->gc[0]; 92 93 /* Disable interrupt on AIC5 */ 94 irq_gc_lock(gc); 95 irq_reg_writel(d->hwirq, gc->reg_base + AT91_AIC5_SSR); 96 irq_reg_writel(1, gc->reg_base + AT91_AIC5_IDCR); 97 gc->mask_cache &= ~d->mask; 98 irq_gc_unlock(gc); 99 } 100 101 static void aic5_unmask(struct irq_data *d) 102 { 103 struct irq_domain *domain = d->domain; 104 struct irq_domain_chip_generic *dgc = domain->gc; 105 struct irq_chip_generic *gc = dgc->gc[0]; 106 107 /* Enable interrupt on AIC5 */ 108 irq_gc_lock(gc); 109 irq_reg_writel(d->hwirq, gc->reg_base + AT91_AIC5_SSR); 110 irq_reg_writel(1, gc->reg_base + AT91_AIC5_IECR); 111 gc->mask_cache |= d->mask; 112 irq_gc_unlock(gc); 113 } 114 115 static int aic5_retrigger(struct irq_data *d) 116 { 117 struct irq_domain *domain = d->domain; 118 struct irq_domain_chip_generic *dgc = domain->gc; 119 struct irq_chip_generic *gc = dgc->gc[0]; 120 121 /* Enable interrupt on AIC5 */ 122 irq_gc_lock(gc); 123 irq_reg_writel(d->hwirq, gc->reg_base + AT91_AIC5_SSR); 124 irq_reg_writel(1, gc->reg_base + AT91_AIC5_ISCR); 125 irq_gc_unlock(gc); 126 127 return 0; 128 } 129 130 static int aic5_set_type(struct irq_data *d, unsigned type) 131 { 132 struct irq_domain *domain = d->domain; 133 struct irq_domain_chip_generic *dgc = domain->gc; 134 struct irq_chip_generic *gc = dgc->gc[0]; 135 unsigned int smr; 136 int ret; 137 138 irq_gc_lock(gc); 139 irq_reg_writel(d->hwirq, gc->reg_base + AT91_AIC5_SSR); 140 smr = irq_reg_readl(gc->reg_base + AT91_AIC5_SMR); 141 ret = aic_common_set_type(d, type, &smr); 142 if (!ret) 143 irq_reg_writel(smr, gc->reg_base + AT91_AIC5_SMR); 144 irq_gc_unlock(gc); 145 146 return ret; 147 } 148 149 #ifdef CONFIG_PM 150 static void aic5_suspend(struct irq_data *d) 151 { 152 struct irq_domain *domain = d->domain; 153 struct irq_domain_chip_generic *dgc = domain->gc; 154 struct irq_chip_generic *bgc = dgc->gc[0]; 155 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 156 int i; 157 u32 mask; 158 159 irq_gc_lock(bgc); 160 for (i = 0; i < dgc->irqs_per_chip; i++) { 161 mask = 1 << i; 162 if ((mask & gc->mask_cache) == (mask & gc->wake_active)) 163 continue; 164 165 irq_reg_writel(i + gc->irq_base, 166 bgc->reg_base + AT91_AIC5_SSR); 167 if (mask & gc->wake_active) 168 irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IECR); 169 else 170 irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IDCR); 171 } 172 irq_gc_unlock(bgc); 173 } 174 175 static void aic5_resume(struct irq_data *d) 176 { 177 struct irq_domain *domain = d->domain; 178 struct irq_domain_chip_generic *dgc = domain->gc; 179 struct irq_chip_generic *bgc = dgc->gc[0]; 180 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 181 int i; 182 u32 mask; 183 184 irq_gc_lock(bgc); 185 for (i = 0; i < dgc->irqs_per_chip; i++) { 186 mask = 1 << i; 187 if ((mask & gc->mask_cache) == (mask & gc->wake_active)) 188 continue; 189 190 irq_reg_writel(i + gc->irq_base, 191 bgc->reg_base + AT91_AIC5_SSR); 192 if (mask & gc->mask_cache) 193 irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IECR); 194 else 195 irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IDCR); 196 } 197 irq_gc_unlock(bgc); 198 } 199 200 static void aic5_pm_shutdown(struct irq_data *d) 201 { 202 struct irq_domain *domain = d->domain; 203 struct irq_domain_chip_generic *dgc = domain->gc; 204 struct irq_chip_generic *bgc = dgc->gc[0]; 205 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 206 int i; 207 208 irq_gc_lock(bgc); 209 for (i = 0; i < dgc->irqs_per_chip; i++) { 210 irq_reg_writel(i + gc->irq_base, 211 bgc->reg_base + AT91_AIC5_SSR); 212 irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IDCR); 213 irq_reg_writel(1, bgc->reg_base + AT91_AIC5_ICCR); 214 } 215 irq_gc_unlock(bgc); 216 } 217 #else 218 #define aic5_suspend NULL 219 #define aic5_resume NULL 220 #define aic5_pm_shutdown NULL 221 #endif /* CONFIG_PM */ 222 223 static void __init aic5_hw_init(struct irq_domain *domain) 224 { 225 struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0); 226 int i; 227 228 /* 229 * Perform 8 End Of Interrupt Command to make sure AIC 230 * will not Lock out nIRQ 231 */ 232 for (i = 0; i < 8; i++) 233 irq_reg_writel(0, gc->reg_base + AT91_AIC5_EOICR); 234 235 /* 236 * Spurious Interrupt ID in Spurious Vector Register. 237 * When there is no current interrupt, the IRQ Vector Register 238 * reads the value stored in AIC_SPU 239 */ 240 irq_reg_writel(0xffffffff, gc->reg_base + AT91_AIC5_SPU); 241 242 /* No debugging in AIC: Debug (Protect) Control Register */ 243 irq_reg_writel(0, gc->reg_base + AT91_AIC5_DCR); 244 245 /* Disable and clear all interrupts initially */ 246 for (i = 0; i < domain->revmap_size; i++) { 247 irq_reg_writel(i, gc->reg_base + AT91_AIC5_SSR); 248 irq_reg_writel(i, gc->reg_base + AT91_AIC5_SVR); 249 irq_reg_writel(1, gc->reg_base + AT91_AIC5_IDCR); 250 irq_reg_writel(1, gc->reg_base + AT91_AIC5_ICCR); 251 } 252 } 253 254 static int aic5_irq_domain_xlate(struct irq_domain *d, 255 struct device_node *ctrlr, 256 const u32 *intspec, unsigned int intsize, 257 irq_hw_number_t *out_hwirq, 258 unsigned int *out_type) 259 { 260 struct irq_domain_chip_generic *dgc = d->gc; 261 struct irq_chip_generic *gc; 262 unsigned smr; 263 int ret; 264 265 if (!dgc) 266 return -EINVAL; 267 268 ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize, 269 out_hwirq, out_type); 270 if (ret) 271 return ret; 272 273 gc = dgc->gc[0]; 274 275 irq_gc_lock(gc); 276 irq_reg_writel(*out_hwirq, gc->reg_base + AT91_AIC5_SSR); 277 smr = irq_reg_readl(gc->reg_base + AT91_AIC5_SMR); 278 ret = aic_common_set_priority(intspec[2], &smr); 279 if (!ret) 280 irq_reg_writel(intspec[2] | smr, gc->reg_base + AT91_AIC5_SMR); 281 irq_gc_unlock(gc); 282 283 return ret; 284 } 285 286 static const struct irq_domain_ops aic5_irq_ops = { 287 .map = irq_map_generic_chip, 288 .xlate = aic5_irq_domain_xlate, 289 }; 290 291 static void __init sama5d3_aic_irq_fixup(struct device_node *root) 292 { 293 aic_common_rtc_irq_fixup(root); 294 } 295 296 static const struct of_device_id __initdata aic5_irq_fixups[] = { 297 { .compatible = "atmel,sama5d3", .data = sama5d3_aic_irq_fixup }, 298 { .compatible = "atmel,sama5d4", .data = sama5d3_aic_irq_fixup }, 299 { /* sentinel */ }, 300 }; 301 302 static int __init aic5_of_init(struct device_node *node, 303 struct device_node *parent, 304 int nirqs) 305 { 306 struct irq_chip_generic *gc; 307 struct irq_domain *domain; 308 int nchips; 309 int i; 310 311 if (nirqs > NR_AIC5_IRQS) 312 return -EINVAL; 313 314 if (aic5_domain) 315 return -EEXIST; 316 317 domain = aic_common_of_init(node, &aic5_irq_ops, "atmel-aic5", 318 nirqs); 319 if (IS_ERR(domain)) 320 return PTR_ERR(domain); 321 322 aic_common_irq_fixup(aic5_irq_fixups); 323 324 aic5_domain = domain; 325 nchips = aic5_domain->revmap_size / 32; 326 for (i = 0; i < nchips; i++) { 327 gc = irq_get_domain_generic_chip(domain, i * 32); 328 329 gc->chip_types[0].regs.eoi = AT91_AIC5_EOICR; 330 gc->chip_types[0].chip.irq_mask = aic5_mask; 331 gc->chip_types[0].chip.irq_unmask = aic5_unmask; 332 gc->chip_types[0].chip.irq_retrigger = aic5_retrigger; 333 gc->chip_types[0].chip.irq_set_type = aic5_set_type; 334 gc->chip_types[0].chip.irq_suspend = aic5_suspend; 335 gc->chip_types[0].chip.irq_resume = aic5_resume; 336 gc->chip_types[0].chip.irq_pm_shutdown = aic5_pm_shutdown; 337 } 338 339 aic5_hw_init(domain); 340 set_handle_irq(aic5_handle); 341 342 return 0; 343 } 344 345 #define NR_SAMA5D3_IRQS 48 346 347 static int __init sama5d3_aic5_of_init(struct device_node *node, 348 struct device_node *parent) 349 { 350 return aic5_of_init(node, parent, NR_SAMA5D3_IRQS); 351 } 352 IRQCHIP_DECLARE(sama5d3_aic5, "atmel,sama5d3-aic", sama5d3_aic5_of_init); 353 354 #define NR_SAMA5D4_IRQS 68 355 356 static int __init sama5d4_aic5_of_init(struct device_node *node, 357 struct device_node *parent) 358 { 359 return aic5_of_init(node, parent, NR_SAMA5D4_IRQS); 360 } 361 IRQCHIP_DECLARE(sama5d4_aic5, "atmel,sama5d4-aic", sama5d4_aic5_of_init); 362