1 /* 2 * linux/arch/arm/mach-mmp/irq.c 3 * 4 * Generic IRQ handling, GPIO IRQ demultiplexing, etc. 5 * Copyright (C) 2008 - 2012 Marvell Technology Group Ltd. 6 * 7 * Author: Bin Yang <bin.yang@marvell.com> 8 * Haojian Zhuang <haojian.zhuang@gmail.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/irq.h> 18 #include <linux/irqchip.h> 19 #include <linux/irqdomain.h> 20 #include <linux/io.h> 21 #include <linux/ioport.h> 22 #include <linux/of_address.h> 23 #include <linux/of_irq.h> 24 25 #include <asm/exception.h> 26 #include <asm/hardirq.h> 27 28 #define MAX_ICU_NR 16 29 30 #define PJ1_INT_SEL 0x10c 31 #define PJ4_INT_SEL 0x104 32 33 /* bit fields in PJ1_INT_SEL and PJ4_INT_SEL */ 34 #define SEL_INT_PENDING (1 << 6) 35 #define SEL_INT_NUM_MASK 0x3f 36 37 struct icu_chip_data { 38 int nr_irqs; 39 unsigned int virq_base; 40 unsigned int cascade_irq; 41 void __iomem *reg_status; 42 void __iomem *reg_mask; 43 unsigned int conf_enable; 44 unsigned int conf_disable; 45 unsigned int conf_mask; 46 unsigned int clr_mfp_irq_base; 47 unsigned int clr_mfp_hwirq; 48 struct irq_domain *domain; 49 }; 50 51 struct mmp_intc_conf { 52 unsigned int conf_enable; 53 unsigned int conf_disable; 54 unsigned int conf_mask; 55 }; 56 57 static void __iomem *mmp_icu_base; 58 static struct icu_chip_data icu_data[MAX_ICU_NR]; 59 static int max_icu_nr; 60 61 extern void mmp2_clear_pmic_int(void); 62 63 static void icu_mask_ack_irq(struct irq_data *d) 64 { 65 struct irq_domain *domain = d->domain; 66 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data; 67 int hwirq; 68 u32 r; 69 70 hwirq = d->irq - data->virq_base; 71 if (data == &icu_data[0]) { 72 r = readl_relaxed(mmp_icu_base + (hwirq << 2)); 73 r &= ~data->conf_mask; 74 r |= data->conf_disable; 75 writel_relaxed(r, mmp_icu_base + (hwirq << 2)); 76 } else { 77 #ifdef CONFIG_CPU_MMP2 78 if ((data->virq_base == data->clr_mfp_irq_base) 79 && (hwirq == data->clr_mfp_hwirq)) 80 mmp2_clear_pmic_int(); 81 #endif 82 r = readl_relaxed(data->reg_mask) | (1 << hwirq); 83 writel_relaxed(r, data->reg_mask); 84 } 85 } 86 87 static void icu_mask_irq(struct irq_data *d) 88 { 89 struct irq_domain *domain = d->domain; 90 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data; 91 int hwirq; 92 u32 r; 93 94 hwirq = d->irq - data->virq_base; 95 if (data == &icu_data[0]) { 96 r = readl_relaxed(mmp_icu_base + (hwirq << 2)); 97 r &= ~data->conf_mask; 98 r |= data->conf_disable; 99 writel_relaxed(r, mmp_icu_base + (hwirq << 2)); 100 } else { 101 r = readl_relaxed(data->reg_mask) | (1 << hwirq); 102 writel_relaxed(r, data->reg_mask); 103 } 104 } 105 106 static void icu_unmask_irq(struct irq_data *d) 107 { 108 struct irq_domain *domain = d->domain; 109 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data; 110 int hwirq; 111 u32 r; 112 113 hwirq = d->irq - data->virq_base; 114 if (data == &icu_data[0]) { 115 r = readl_relaxed(mmp_icu_base + (hwirq << 2)); 116 r &= ~data->conf_mask; 117 r |= data->conf_enable; 118 writel_relaxed(r, mmp_icu_base + (hwirq << 2)); 119 } else { 120 r = readl_relaxed(data->reg_mask) & ~(1 << hwirq); 121 writel_relaxed(r, data->reg_mask); 122 } 123 } 124 125 struct irq_chip icu_irq_chip = { 126 .name = "icu_irq", 127 .irq_mask = icu_mask_irq, 128 .irq_mask_ack = icu_mask_ack_irq, 129 .irq_unmask = icu_unmask_irq, 130 }; 131 132 static void icu_mux_irq_demux(struct irq_desc *desc) 133 { 134 unsigned int irq = irq_desc_get_irq(desc); 135 struct irq_domain *domain; 136 struct icu_chip_data *data; 137 int i; 138 unsigned long mask, status, n; 139 140 for (i = 1; i < max_icu_nr; i++) { 141 if (irq == icu_data[i].cascade_irq) { 142 domain = icu_data[i].domain; 143 data = (struct icu_chip_data *)domain->host_data; 144 break; 145 } 146 } 147 if (i >= max_icu_nr) { 148 pr_err("Spurious irq %d in MMP INTC\n", irq); 149 return; 150 } 151 152 mask = readl_relaxed(data->reg_mask); 153 while (1) { 154 status = readl_relaxed(data->reg_status) & ~mask; 155 if (status == 0) 156 break; 157 for_each_set_bit(n, &status, BITS_PER_LONG) { 158 generic_handle_irq(icu_data[i].virq_base + n); 159 } 160 } 161 } 162 163 static int mmp_irq_domain_map(struct irq_domain *d, unsigned int irq, 164 irq_hw_number_t hw) 165 { 166 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq); 167 return 0; 168 } 169 170 static int mmp_irq_domain_xlate(struct irq_domain *d, struct device_node *node, 171 const u32 *intspec, unsigned int intsize, 172 unsigned long *out_hwirq, 173 unsigned int *out_type) 174 { 175 *out_hwirq = intspec[0]; 176 return 0; 177 } 178 179 const struct irq_domain_ops mmp_irq_domain_ops = { 180 .map = mmp_irq_domain_map, 181 .xlate = mmp_irq_domain_xlate, 182 }; 183 184 static struct mmp_intc_conf mmp_conf = { 185 .conf_enable = 0x51, 186 .conf_disable = 0x0, 187 .conf_mask = 0x7f, 188 }; 189 190 static struct mmp_intc_conf mmp2_conf = { 191 .conf_enable = 0x20, 192 .conf_disable = 0x0, 193 .conf_mask = 0x7f, 194 }; 195 196 static void __exception_irq_entry mmp_handle_irq(struct pt_regs *regs) 197 { 198 int hwirq; 199 200 hwirq = readl_relaxed(mmp_icu_base + PJ1_INT_SEL); 201 if (!(hwirq & SEL_INT_PENDING)) 202 return; 203 hwirq &= SEL_INT_NUM_MASK; 204 handle_domain_irq(icu_data[0].domain, hwirq, regs); 205 } 206 207 static void __exception_irq_entry mmp2_handle_irq(struct pt_regs *regs) 208 { 209 int hwirq; 210 211 hwirq = readl_relaxed(mmp_icu_base + PJ4_INT_SEL); 212 if (!(hwirq & SEL_INT_PENDING)) 213 return; 214 hwirq &= SEL_INT_NUM_MASK; 215 handle_domain_irq(icu_data[0].domain, hwirq, regs); 216 } 217 218 /* MMP (ARMv5) */ 219 void __init icu_init_irq(void) 220 { 221 int irq; 222 223 max_icu_nr = 1; 224 mmp_icu_base = ioremap(0xd4282000, 0x1000); 225 icu_data[0].conf_enable = mmp_conf.conf_enable; 226 icu_data[0].conf_disable = mmp_conf.conf_disable; 227 icu_data[0].conf_mask = mmp_conf.conf_mask; 228 icu_data[0].nr_irqs = 64; 229 icu_data[0].virq_base = 0; 230 icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0, 231 &irq_domain_simple_ops, 232 &icu_data[0]); 233 for (irq = 0; irq < 64; irq++) { 234 icu_mask_irq(irq_get_irq_data(irq)); 235 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq); 236 } 237 irq_set_default_host(icu_data[0].domain); 238 set_handle_irq(mmp_handle_irq); 239 } 240 241 /* MMP2 (ARMv7) */ 242 void __init mmp2_init_icu(void) 243 { 244 int irq, end; 245 246 max_icu_nr = 8; 247 mmp_icu_base = ioremap(0xd4282000, 0x1000); 248 icu_data[0].conf_enable = mmp2_conf.conf_enable; 249 icu_data[0].conf_disable = mmp2_conf.conf_disable; 250 icu_data[0].conf_mask = mmp2_conf.conf_mask; 251 icu_data[0].nr_irqs = 64; 252 icu_data[0].virq_base = 0; 253 icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0, 254 &irq_domain_simple_ops, 255 &icu_data[0]); 256 icu_data[1].reg_status = mmp_icu_base + 0x150; 257 icu_data[1].reg_mask = mmp_icu_base + 0x168; 258 icu_data[1].clr_mfp_irq_base = icu_data[0].virq_base + 259 icu_data[0].nr_irqs; 260 icu_data[1].clr_mfp_hwirq = 1; /* offset to IRQ_MMP2_PMIC_BASE */ 261 icu_data[1].nr_irqs = 2; 262 icu_data[1].cascade_irq = 4; 263 icu_data[1].virq_base = icu_data[0].virq_base + icu_data[0].nr_irqs; 264 icu_data[1].domain = irq_domain_add_legacy(NULL, icu_data[1].nr_irqs, 265 icu_data[1].virq_base, 0, 266 &irq_domain_simple_ops, 267 &icu_data[1]); 268 icu_data[2].reg_status = mmp_icu_base + 0x154; 269 icu_data[2].reg_mask = mmp_icu_base + 0x16c; 270 icu_data[2].nr_irqs = 2; 271 icu_data[2].cascade_irq = 5; 272 icu_data[2].virq_base = icu_data[1].virq_base + icu_data[1].nr_irqs; 273 icu_data[2].domain = irq_domain_add_legacy(NULL, icu_data[2].nr_irqs, 274 icu_data[2].virq_base, 0, 275 &irq_domain_simple_ops, 276 &icu_data[2]); 277 icu_data[3].reg_status = mmp_icu_base + 0x180; 278 icu_data[3].reg_mask = mmp_icu_base + 0x17c; 279 icu_data[3].nr_irqs = 3; 280 icu_data[3].cascade_irq = 9; 281 icu_data[3].virq_base = icu_data[2].virq_base + icu_data[2].nr_irqs; 282 icu_data[3].domain = irq_domain_add_legacy(NULL, icu_data[3].nr_irqs, 283 icu_data[3].virq_base, 0, 284 &irq_domain_simple_ops, 285 &icu_data[3]); 286 icu_data[4].reg_status = mmp_icu_base + 0x158; 287 icu_data[4].reg_mask = mmp_icu_base + 0x170; 288 icu_data[4].nr_irqs = 5; 289 icu_data[4].cascade_irq = 17; 290 icu_data[4].virq_base = icu_data[3].virq_base + icu_data[3].nr_irqs; 291 icu_data[4].domain = irq_domain_add_legacy(NULL, icu_data[4].nr_irqs, 292 icu_data[4].virq_base, 0, 293 &irq_domain_simple_ops, 294 &icu_data[4]); 295 icu_data[5].reg_status = mmp_icu_base + 0x15c; 296 icu_data[5].reg_mask = mmp_icu_base + 0x174; 297 icu_data[5].nr_irqs = 15; 298 icu_data[5].cascade_irq = 35; 299 icu_data[5].virq_base = icu_data[4].virq_base + icu_data[4].nr_irqs; 300 icu_data[5].domain = irq_domain_add_legacy(NULL, icu_data[5].nr_irqs, 301 icu_data[5].virq_base, 0, 302 &irq_domain_simple_ops, 303 &icu_data[5]); 304 icu_data[6].reg_status = mmp_icu_base + 0x160; 305 icu_data[6].reg_mask = mmp_icu_base + 0x178; 306 icu_data[6].nr_irqs = 2; 307 icu_data[6].cascade_irq = 51; 308 icu_data[6].virq_base = icu_data[5].virq_base + icu_data[5].nr_irqs; 309 icu_data[6].domain = irq_domain_add_legacy(NULL, icu_data[6].nr_irqs, 310 icu_data[6].virq_base, 0, 311 &irq_domain_simple_ops, 312 &icu_data[6]); 313 icu_data[7].reg_status = mmp_icu_base + 0x188; 314 icu_data[7].reg_mask = mmp_icu_base + 0x184; 315 icu_data[7].nr_irqs = 2; 316 icu_data[7].cascade_irq = 55; 317 icu_data[7].virq_base = icu_data[6].virq_base + icu_data[6].nr_irqs; 318 icu_data[7].domain = irq_domain_add_legacy(NULL, icu_data[7].nr_irqs, 319 icu_data[7].virq_base, 0, 320 &irq_domain_simple_ops, 321 &icu_data[7]); 322 end = icu_data[7].virq_base + icu_data[7].nr_irqs; 323 for (irq = 0; irq < end; irq++) { 324 icu_mask_irq(irq_get_irq_data(irq)); 325 if (irq == icu_data[1].cascade_irq || 326 irq == icu_data[2].cascade_irq || 327 irq == icu_data[3].cascade_irq || 328 irq == icu_data[4].cascade_irq || 329 irq == icu_data[5].cascade_irq || 330 irq == icu_data[6].cascade_irq || 331 irq == icu_data[7].cascade_irq) { 332 irq_set_chip(irq, &icu_irq_chip); 333 irq_set_chained_handler(irq, icu_mux_irq_demux); 334 } else { 335 irq_set_chip_and_handler(irq, &icu_irq_chip, 336 handle_level_irq); 337 } 338 } 339 irq_set_default_host(icu_data[0].domain); 340 set_handle_irq(mmp2_handle_irq); 341 } 342 343 #ifdef CONFIG_OF 344 static int __init mmp_init_bases(struct device_node *node) 345 { 346 int ret, nr_irqs, irq, i = 0; 347 348 ret = of_property_read_u32(node, "mrvl,intc-nr-irqs", &nr_irqs); 349 if (ret) { 350 pr_err("Not found mrvl,intc-nr-irqs property\n"); 351 return ret; 352 } 353 354 mmp_icu_base = of_iomap(node, 0); 355 if (!mmp_icu_base) { 356 pr_err("Failed to get interrupt controller register\n"); 357 return -ENOMEM; 358 } 359 360 icu_data[0].virq_base = 0; 361 icu_data[0].domain = irq_domain_add_linear(node, nr_irqs, 362 &mmp_irq_domain_ops, 363 &icu_data[0]); 364 for (irq = 0; irq < nr_irqs; irq++) { 365 ret = irq_create_mapping(icu_data[0].domain, irq); 366 if (!ret) { 367 pr_err("Failed to mapping hwirq\n"); 368 goto err; 369 } 370 if (!irq) 371 icu_data[0].virq_base = ret; 372 } 373 icu_data[0].nr_irqs = nr_irqs; 374 return 0; 375 err: 376 if (icu_data[0].virq_base) { 377 for (i = 0; i < irq; i++) 378 irq_dispose_mapping(icu_data[0].virq_base + i); 379 } 380 irq_domain_remove(icu_data[0].domain); 381 iounmap(mmp_icu_base); 382 return -EINVAL; 383 } 384 385 static int __init mmp_of_init(struct device_node *node, 386 struct device_node *parent) 387 { 388 int ret; 389 390 ret = mmp_init_bases(node); 391 if (ret < 0) 392 return ret; 393 394 icu_data[0].conf_enable = mmp_conf.conf_enable; 395 icu_data[0].conf_disable = mmp_conf.conf_disable; 396 icu_data[0].conf_mask = mmp_conf.conf_mask; 397 irq_set_default_host(icu_data[0].domain); 398 set_handle_irq(mmp_handle_irq); 399 max_icu_nr = 1; 400 return 0; 401 } 402 IRQCHIP_DECLARE(mmp_intc, "mrvl,mmp-intc", mmp_of_init); 403 404 static int __init mmp2_of_init(struct device_node *node, 405 struct device_node *parent) 406 { 407 int ret; 408 409 ret = mmp_init_bases(node); 410 if (ret < 0) 411 return ret; 412 413 icu_data[0].conf_enable = mmp2_conf.conf_enable; 414 icu_data[0].conf_disable = mmp2_conf.conf_disable; 415 icu_data[0].conf_mask = mmp2_conf.conf_mask; 416 irq_set_default_host(icu_data[0].domain); 417 set_handle_irq(mmp2_handle_irq); 418 max_icu_nr = 1; 419 return 0; 420 } 421 IRQCHIP_DECLARE(mmp2_intc, "mrvl,mmp2-intc", mmp2_of_init); 422 423 static int __init mmp2_mux_of_init(struct device_node *node, 424 struct device_node *parent) 425 { 426 struct resource res; 427 int i, ret, irq, j = 0; 428 u32 nr_irqs, mfp_irq; 429 430 if (!parent) 431 return -ENODEV; 432 433 i = max_icu_nr; 434 ret = of_property_read_u32(node, "mrvl,intc-nr-irqs", 435 &nr_irqs); 436 if (ret) { 437 pr_err("Not found mrvl,intc-nr-irqs property\n"); 438 return -EINVAL; 439 } 440 ret = of_address_to_resource(node, 0, &res); 441 if (ret < 0) { 442 pr_err("Not found reg property\n"); 443 return -EINVAL; 444 } 445 icu_data[i].reg_status = mmp_icu_base + res.start; 446 ret = of_address_to_resource(node, 1, &res); 447 if (ret < 0) { 448 pr_err("Not found reg property\n"); 449 return -EINVAL; 450 } 451 icu_data[i].reg_mask = mmp_icu_base + res.start; 452 icu_data[i].cascade_irq = irq_of_parse_and_map(node, 0); 453 if (!icu_data[i].cascade_irq) 454 return -EINVAL; 455 456 icu_data[i].virq_base = 0; 457 icu_data[i].domain = irq_domain_add_linear(node, nr_irqs, 458 &mmp_irq_domain_ops, 459 &icu_data[i]); 460 for (irq = 0; irq < nr_irqs; irq++) { 461 ret = irq_create_mapping(icu_data[i].domain, irq); 462 if (!ret) { 463 pr_err("Failed to mapping hwirq\n"); 464 goto err; 465 } 466 if (!irq) 467 icu_data[i].virq_base = ret; 468 } 469 icu_data[i].nr_irqs = nr_irqs; 470 if (!of_property_read_u32(node, "mrvl,clr-mfp-irq", 471 &mfp_irq)) { 472 icu_data[i].clr_mfp_irq_base = icu_data[i].virq_base; 473 icu_data[i].clr_mfp_hwirq = mfp_irq; 474 } 475 irq_set_chained_handler(icu_data[i].cascade_irq, 476 icu_mux_irq_demux); 477 max_icu_nr++; 478 return 0; 479 err: 480 if (icu_data[i].virq_base) { 481 for (j = 0; j < irq; j++) 482 irq_dispose_mapping(icu_data[i].virq_base + j); 483 } 484 irq_domain_remove(icu_data[i].domain); 485 return -EINVAL; 486 } 487 IRQCHIP_DECLARE(mmp2_mux_intc, "mrvl,mmp2-mux-intc", mmp2_mux_of_init); 488 #endif 489