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/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_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_chip_generic *bgc = irq_get_domain_generic_chip(aic5_domain, 0); 74 u32 irqnr; 75 u32 irqstat; 76 77 irqnr = irq_reg_readl(bgc, AT91_AIC5_IVR); 78 irqstat = irq_reg_readl(bgc, AT91_AIC5_ISR); 79 80 if (!irqstat) 81 irq_reg_writel(bgc, 0, AT91_AIC5_EOICR); 82 else 83 handle_domain_irq(aic5_domain, irqnr, regs); 84 } 85 86 static void aic5_mask(struct irq_data *d) 87 { 88 struct irq_domain *domain = d->domain; 89 struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0); 90 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 91 92 /* 93 * Disable interrupt on AIC5. We always take the lock of the 94 * first irq chip as all chips share the same registers. 95 */ 96 irq_gc_lock(bgc); 97 irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR); 98 irq_reg_writel(gc, 1, AT91_AIC5_IDCR); 99 gc->mask_cache &= ~d->mask; 100 irq_gc_unlock(bgc); 101 } 102 103 static void aic5_unmask(struct irq_data *d) 104 { 105 struct irq_domain *domain = d->domain; 106 struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0); 107 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 108 109 /* 110 * Enable interrupt on AIC5. We always take the lock of the 111 * first irq chip as all chips share the same registers. 112 */ 113 irq_gc_lock(bgc); 114 irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR); 115 irq_reg_writel(gc, 1, AT91_AIC5_IECR); 116 gc->mask_cache |= d->mask; 117 irq_gc_unlock(bgc); 118 } 119 120 static int aic5_retrigger(struct irq_data *d) 121 { 122 struct irq_domain *domain = d->domain; 123 struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0); 124 125 /* Enable interrupt on AIC5 */ 126 irq_gc_lock(bgc); 127 irq_reg_writel(bgc, d->hwirq, AT91_AIC5_SSR); 128 irq_reg_writel(bgc, 1, AT91_AIC5_ISCR); 129 irq_gc_unlock(bgc); 130 131 return 1; 132 } 133 134 static int aic5_set_type(struct irq_data *d, unsigned type) 135 { 136 struct irq_domain *domain = d->domain; 137 struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0); 138 unsigned int smr; 139 int ret; 140 141 irq_gc_lock(bgc); 142 irq_reg_writel(bgc, d->hwirq, AT91_AIC5_SSR); 143 smr = irq_reg_readl(bgc, AT91_AIC5_SMR); 144 ret = aic_common_set_type(d, type, &smr); 145 if (!ret) 146 irq_reg_writel(bgc, smr, AT91_AIC5_SMR); 147 irq_gc_unlock(bgc); 148 149 return ret; 150 } 151 152 #ifdef CONFIG_PM 153 static u32 *smr_cache; 154 155 static void aic5_suspend(struct irq_data *d) 156 { 157 struct irq_domain *domain = d->domain; 158 struct irq_domain_chip_generic *dgc = domain->gc; 159 struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0); 160 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 161 int i; 162 u32 mask; 163 164 if (smr_cache) 165 for (i = 0; i < domain->revmap_size; i++) { 166 irq_reg_writel(bgc, i, AT91_AIC5_SSR); 167 smr_cache[i] = irq_reg_readl(bgc, AT91_AIC5_SMR); 168 } 169 170 irq_gc_lock(bgc); 171 for (i = 0; i < dgc->irqs_per_chip; i++) { 172 mask = 1 << i; 173 if ((mask & gc->mask_cache) == (mask & gc->wake_active)) 174 continue; 175 176 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR); 177 if (mask & gc->wake_active) 178 irq_reg_writel(bgc, 1, AT91_AIC5_IECR); 179 else 180 irq_reg_writel(bgc, 1, AT91_AIC5_IDCR); 181 } 182 irq_gc_unlock(bgc); 183 } 184 185 static void aic5_resume(struct irq_data *d) 186 { 187 struct irq_domain *domain = d->domain; 188 struct irq_domain_chip_generic *dgc = domain->gc; 189 struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0); 190 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 191 int i; 192 u32 mask; 193 194 irq_gc_lock(bgc); 195 196 if (smr_cache) { 197 irq_reg_writel(bgc, 0xffffffff, AT91_AIC5_SPU); 198 for (i = 0; i < domain->revmap_size; i++) { 199 irq_reg_writel(bgc, i, AT91_AIC5_SSR); 200 irq_reg_writel(bgc, i, AT91_AIC5_SVR); 201 irq_reg_writel(bgc, smr_cache[i], AT91_AIC5_SMR); 202 } 203 } 204 205 for (i = 0; i < dgc->irqs_per_chip; i++) { 206 mask = 1 << i; 207 208 if (!smr_cache && 209 ((mask & gc->mask_cache) == (mask & gc->wake_active))) 210 continue; 211 212 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR); 213 if (mask & gc->mask_cache) 214 irq_reg_writel(bgc, 1, AT91_AIC5_IECR); 215 else 216 irq_reg_writel(bgc, 1, AT91_AIC5_IDCR); 217 } 218 irq_gc_unlock(bgc); 219 } 220 221 static void aic5_pm_shutdown(struct irq_data *d) 222 { 223 struct irq_domain *domain = d->domain; 224 struct irq_domain_chip_generic *dgc = domain->gc; 225 struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0); 226 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 227 int i; 228 229 irq_gc_lock(bgc); 230 for (i = 0; i < dgc->irqs_per_chip; i++) { 231 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR); 232 irq_reg_writel(bgc, 1, AT91_AIC5_IDCR); 233 irq_reg_writel(bgc, 1, AT91_AIC5_ICCR); 234 } 235 irq_gc_unlock(bgc); 236 } 237 #else 238 #define aic5_suspend NULL 239 #define aic5_resume NULL 240 #define aic5_pm_shutdown NULL 241 #endif /* CONFIG_PM */ 242 243 static void __init aic5_hw_init(struct irq_domain *domain) 244 { 245 struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0); 246 int i; 247 248 /* 249 * Perform 8 End Of Interrupt Command to make sure AIC 250 * will not Lock out nIRQ 251 */ 252 for (i = 0; i < 8; i++) 253 irq_reg_writel(gc, 0, AT91_AIC5_EOICR); 254 255 /* 256 * Spurious Interrupt ID in Spurious Vector Register. 257 * When there is no current interrupt, the IRQ Vector Register 258 * reads the value stored in AIC_SPU 259 */ 260 irq_reg_writel(gc, 0xffffffff, AT91_AIC5_SPU); 261 262 /* No debugging in AIC: Debug (Protect) Control Register */ 263 irq_reg_writel(gc, 0, AT91_AIC5_DCR); 264 265 /* Disable and clear all interrupts initially */ 266 for (i = 0; i < domain->revmap_size; i++) { 267 irq_reg_writel(gc, i, AT91_AIC5_SSR); 268 irq_reg_writel(gc, i, AT91_AIC5_SVR); 269 irq_reg_writel(gc, 1, AT91_AIC5_IDCR); 270 irq_reg_writel(gc, 1, AT91_AIC5_ICCR); 271 } 272 } 273 274 static int aic5_irq_domain_xlate(struct irq_domain *d, 275 struct device_node *ctrlr, 276 const u32 *intspec, unsigned int intsize, 277 irq_hw_number_t *out_hwirq, 278 unsigned int *out_type) 279 { 280 struct irq_chip_generic *bgc = irq_get_domain_generic_chip(d, 0); 281 unsigned long flags; 282 unsigned smr; 283 int ret; 284 285 if (!bgc) 286 return -EINVAL; 287 288 ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize, 289 out_hwirq, out_type); 290 if (ret) 291 return ret; 292 293 irq_gc_lock_irqsave(bgc, flags); 294 irq_reg_writel(bgc, *out_hwirq, AT91_AIC5_SSR); 295 smr = irq_reg_readl(bgc, AT91_AIC5_SMR); 296 aic_common_set_priority(intspec[2], &smr); 297 irq_reg_writel(bgc, smr, AT91_AIC5_SMR); 298 irq_gc_unlock_irqrestore(bgc, flags); 299 300 return ret; 301 } 302 303 static const struct irq_domain_ops aic5_irq_ops = { 304 .map = irq_map_generic_chip, 305 .xlate = aic5_irq_domain_xlate, 306 }; 307 308 static void __init sama5d3_aic_irq_fixup(void) 309 { 310 aic_common_rtc_irq_fixup(); 311 } 312 313 static void __init sam9x60_aic_irq_fixup(void) 314 { 315 aic_common_rtc_irq_fixup(); 316 aic_common_rtt_irq_fixup(); 317 } 318 319 static const struct of_device_id aic5_irq_fixups[] __initconst = { 320 { .compatible = "atmel,sama5d3", .data = sama5d3_aic_irq_fixup }, 321 { .compatible = "atmel,sama5d4", .data = sama5d3_aic_irq_fixup }, 322 { .compatible = "microchip,sam9x60", .data = sam9x60_aic_irq_fixup }, 323 { /* sentinel */ }, 324 }; 325 326 static int __init aic5_of_init(struct device_node *node, 327 struct device_node *parent, 328 int nirqs) 329 { 330 struct irq_chip_generic *gc; 331 struct irq_domain *domain; 332 int nchips; 333 int i; 334 335 if (nirqs > NR_AIC5_IRQS) 336 return -EINVAL; 337 338 if (aic5_domain) 339 return -EEXIST; 340 341 domain = aic_common_of_init(node, &aic5_irq_ops, "atmel-aic5", 342 nirqs, aic5_irq_fixups); 343 if (IS_ERR(domain)) 344 return PTR_ERR(domain); 345 346 aic5_domain = domain; 347 nchips = aic5_domain->revmap_size / 32; 348 for (i = 0; i < nchips; i++) { 349 gc = irq_get_domain_generic_chip(domain, i * 32); 350 351 gc->chip_types[0].regs.eoi = AT91_AIC5_EOICR; 352 gc->chip_types[0].chip.irq_mask = aic5_mask; 353 gc->chip_types[0].chip.irq_unmask = aic5_unmask; 354 gc->chip_types[0].chip.irq_retrigger = aic5_retrigger; 355 gc->chip_types[0].chip.irq_set_type = aic5_set_type; 356 gc->chip_types[0].chip.irq_suspend = aic5_suspend; 357 gc->chip_types[0].chip.irq_resume = aic5_resume; 358 gc->chip_types[0].chip.irq_pm_shutdown = aic5_pm_shutdown; 359 } 360 361 aic5_hw_init(domain); 362 set_handle_irq(aic5_handle); 363 364 return 0; 365 } 366 367 #define NR_SAMA5D2_IRQS 77 368 369 static int __init sama5d2_aic5_of_init(struct device_node *node, 370 struct device_node *parent) 371 { 372 #ifdef CONFIG_PM 373 smr_cache = kcalloc(DIV_ROUND_UP(NR_SAMA5D2_IRQS, 32) * 32, 374 sizeof(*smr_cache), GFP_KERNEL); 375 if (!smr_cache) 376 return -ENOMEM; 377 #endif 378 379 return aic5_of_init(node, parent, NR_SAMA5D2_IRQS); 380 } 381 IRQCHIP_DECLARE(sama5d2_aic5, "atmel,sama5d2-aic", sama5d2_aic5_of_init); 382 383 #define NR_SAMA5D3_IRQS 48 384 385 static int __init sama5d3_aic5_of_init(struct device_node *node, 386 struct device_node *parent) 387 { 388 return aic5_of_init(node, parent, NR_SAMA5D3_IRQS); 389 } 390 IRQCHIP_DECLARE(sama5d3_aic5, "atmel,sama5d3-aic", sama5d3_aic5_of_init); 391 392 #define NR_SAMA5D4_IRQS 68 393 394 static int __init sama5d4_aic5_of_init(struct device_node *node, 395 struct device_node *parent) 396 { 397 return aic5_of_init(node, parent, NR_SAMA5D4_IRQS); 398 } 399 IRQCHIP_DECLARE(sama5d4_aic5, "atmel,sama5d4-aic", sama5d4_aic5_of_init); 400 401 #define NR_SAM9X60_IRQS 50 402 403 static int __init sam9x60_aic5_of_init(struct device_node *node, 404 struct device_node *parent) 405 { 406 return aic5_of_init(node, parent, NR_SAM9X60_IRQS); 407 } 408 IRQCHIP_DECLARE(sam9x60_aic5, "microchip,sam9x60-aic", sam9x60_aic5_of_init); 409