drivers/irqchip/irq-mmp.c

   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         set_irq_flags(irq, IRQF_VALID);
 168         return 0;
 169 }
 170
 171 static int mmp_irq_domain_xlate(struct irq_domain *d, struct device_node *node,
 172                                 const u32 *intspec, unsigned int intsize,
 173                                 unsigned long *out_hwirq,
 174                                 unsigned int *out_type)
 175 {
 176         *out_hwirq = intspec[0];
 177         return 0;
 178 }
 179
 180 const struct irq_domain_ops mmp_irq_domain_ops = {
 181         .map            = mmp_irq_domain_map,
 182         .xlate          = mmp_irq_domain_xlate,
 183 };
 184
 185 static struct mmp_intc_conf mmp_conf = {
 186         .conf_enable    = 0x51,
 187         .conf_disable   = 0x0,
 188         .conf_mask      = 0x7f,
 189 };
 190
 191 static struct mmp_intc_conf mmp2_conf = {
 192         .conf_enable    = 0x20,
 193         .conf_disable   = 0x0,
 194         .conf_mask      = 0x7f,
 195 };
 196
 197 static void __exception_irq_entry mmp_handle_irq(struct pt_regs *regs)
 198 {
 199         int hwirq;
 200
 201         hwirq = readl_relaxed(mmp_icu_base + PJ1_INT_SEL);
 202         if (!(hwirq & SEL_INT_PENDING))
 203                 return;
 204         hwirq &= SEL_INT_NUM_MASK;
 205         handle_domain_irq(icu_data[0].domain, hwirq, regs);
 206 }
 207
 208 static void __exception_irq_entry mmp2_handle_irq(struct pt_regs *regs)
 209 {
 210         int hwirq;
 211
 212         hwirq = readl_relaxed(mmp_icu_base + PJ4_INT_SEL);
 213         if (!(hwirq & SEL_INT_PENDING))
 214                 return;
 215         hwirq &= SEL_INT_NUM_MASK;
 216         handle_domain_irq(icu_data[0].domain, hwirq, regs);
 217 }
 218
 219 /* MMP (ARMv5) */
 220 void __init icu_init_irq(void)
 221 {
 222         int irq;
 223
 224         max_icu_nr = 1;
 225         mmp_icu_base = ioremap(0xd4282000, 0x1000);
 226         icu_data[0].conf_enable = mmp_conf.conf_enable;
 227         icu_data[0].conf_disable = mmp_conf.conf_disable;
 228         icu_data[0].conf_mask = mmp_conf.conf_mask;
 229         icu_data[0].nr_irqs = 64;
 230         icu_data[0].virq_base = 0;
 231         icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0,
 232                                                    &irq_domain_simple_ops,
 233                                                    &icu_data[0]);
 234         for (irq = 0; irq < 64; irq++) {
 235                 icu_mask_irq(irq_get_irq_data(irq));
 236                 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
 237                 set_irq_flags(irq, IRQF_VALID);
 238         }
 239         irq_set_default_host(icu_data[0].domain);
 240         set_handle_irq(mmp_handle_irq);
 241 }
 242
 243 /* MMP2 (ARMv7) */
 244 void __init mmp2_init_icu(void)
 245 {
 246         int irq, end;
 247
 248         max_icu_nr = 8;
 249         mmp_icu_base = ioremap(0xd4282000, 0x1000);
 250         icu_data[0].conf_enable = mmp2_conf.conf_enable;
 251         icu_data[0].conf_disable = mmp2_conf.conf_disable;
 252         icu_data[0].conf_mask = mmp2_conf.conf_mask;
 253         icu_data[0].nr_irqs = 64;
 254         icu_data[0].virq_base = 0;
 255         icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0,
 256                                                    &irq_domain_simple_ops,
 257                                                    &icu_data[0]);
 258         icu_data[1].reg_status = mmp_icu_base + 0x150;
 259         icu_data[1].reg_mask = mmp_icu_base + 0x168;
 260         icu_data[1].clr_mfp_irq_base = icu_data[0].virq_base +
 261                                 icu_data[0].nr_irqs;
 262         icu_data[1].clr_mfp_hwirq = 1;          /* offset to IRQ_MMP2_PMIC_BASE */
 263         icu_data[1].nr_irqs = 2;
 264         icu_data[1].cascade_irq = 4;
 265         icu_data[1].virq_base = icu_data[0].virq_base + icu_data[0].nr_irqs;
 266         icu_data[1].domain = irq_domain_add_legacy(NULL, icu_data[1].nr_irqs,
 267                                                    icu_data[1].virq_base, 0,
 268                                                    &irq_domain_simple_ops,
 269                                                    &icu_data[1]);
 270         icu_data[2].reg_status = mmp_icu_base + 0x154;
 271         icu_data[2].reg_mask = mmp_icu_base + 0x16c;
 272         icu_data[2].nr_irqs = 2;
 273         icu_data[2].cascade_irq = 5;
 274         icu_data[2].virq_base = icu_data[1].virq_base + icu_data[1].nr_irqs;
 275         icu_data[2].domain = irq_domain_add_legacy(NULL, icu_data[2].nr_irqs,
 276                                                    icu_data[2].virq_base, 0,
 277                                                    &irq_domain_simple_ops,
 278                                                    &icu_data[2]);
 279         icu_data[3].reg_status = mmp_icu_base + 0x180;
 280         icu_data[3].reg_mask = mmp_icu_base + 0x17c;
 281         icu_data[3].nr_irqs = 3;
 282         icu_data[3].cascade_irq = 9;
 283         icu_data[3].virq_base = icu_data[2].virq_base + icu_data[2].nr_irqs;
 284         icu_data[3].domain = irq_domain_add_legacy(NULL, icu_data[3].nr_irqs,
 285                                                    icu_data[3].virq_base, 0,
 286                                                    &irq_domain_simple_ops,
 287                                                    &icu_data[3]);
 288         icu_data[4].reg_status = mmp_icu_base + 0x158;
 289         icu_data[4].reg_mask = mmp_icu_base + 0x170;
 290         icu_data[4].nr_irqs = 5;
 291         icu_data[4].cascade_irq = 17;
 292         icu_data[4].virq_base = icu_data[3].virq_base + icu_data[3].nr_irqs;
 293         icu_data[4].domain = irq_domain_add_legacy(NULL, icu_data[4].nr_irqs,
 294                                                    icu_data[4].virq_base, 0,
 295                                                    &irq_domain_simple_ops,
 296                                                    &icu_data[4]);
 297         icu_data[5].reg_status = mmp_icu_base + 0x15c;
 298         icu_data[5].reg_mask = mmp_icu_base + 0x174;
 299         icu_data[5].nr_irqs = 15;
 300         icu_data[5].cascade_irq = 35;
 301         icu_data[5].virq_base = icu_data[4].virq_base + icu_data[4].nr_irqs;
 302         icu_data[5].domain = irq_domain_add_legacy(NULL, icu_data[5].nr_irqs,
 303                                                    icu_data[5].virq_base, 0,
 304                                                    &irq_domain_simple_ops,
 305                                                    &icu_data[5]);
 306         icu_data[6].reg_status = mmp_icu_base + 0x160;
 307         icu_data[6].reg_mask = mmp_icu_base + 0x178;
 308         icu_data[6].nr_irqs = 2;
 309         icu_data[6].cascade_irq = 51;
 310         icu_data[6].virq_base = icu_data[5].virq_base + icu_data[5].nr_irqs;
 311         icu_data[6].domain = irq_domain_add_legacy(NULL, icu_data[6].nr_irqs,
 312                                                    icu_data[6].virq_base, 0,
 313                                                    &irq_domain_simple_ops,
 314                                                    &icu_data[6]);
 315         icu_data[7].reg_status = mmp_icu_base + 0x188;
 316         icu_data[7].reg_mask = mmp_icu_base + 0x184;
 317         icu_data[7].nr_irqs = 2;
 318         icu_data[7].cascade_irq = 55;
 319         icu_data[7].virq_base = icu_data[6].virq_base + icu_data[6].nr_irqs;
 320         icu_data[7].domain = irq_domain_add_legacy(NULL, icu_data[7].nr_irqs,
 321                                                    icu_data[7].virq_base, 0,
 322                                                    &irq_domain_simple_ops,
 323                                                    &icu_data[7]);
 324         end = icu_data[7].virq_base + icu_data[7].nr_irqs;
 325         for (irq = 0; irq < end; irq++) {
 326                 icu_mask_irq(irq_get_irq_data(irq));
 327                 if (irq == icu_data[1].cascade_irq ||
 328                     irq == icu_data[2].cascade_irq ||
 329                     irq == icu_data[3].cascade_irq ||
 330                     irq == icu_data[4].cascade_irq ||
 331                     irq == icu_data[5].cascade_irq ||
 332                     irq == icu_data[6].cascade_irq ||
 333                     irq == icu_data[7].cascade_irq) {
 334                         irq_set_chip(irq, &icu_irq_chip);
 335                         irq_set_chained_handler(irq, icu_mux_irq_demux);
 336                 } else {
 337                         irq_set_chip_and_handler(irq, &icu_irq_chip,
 338                                                  handle_level_irq);
 339                 }
 340                 set_irq_flags(irq, IRQF_VALID);
 341         }
 342         irq_set_default_host(icu_data[0].domain);
 343         set_handle_irq(mmp2_handle_irq);
 344 }
 345
 346 #ifdef CONFIG_OF
 347 static int __init mmp_init_bases(struct device_node *node)
 348 {
 349         int ret, nr_irqs, irq, i = 0;
 350
 351         ret = of_property_read_u32(node, "mrvl,intc-nr-irqs", &nr_irqs);
 352         if (ret) {
 353                 pr_err("Not found mrvl,intc-nr-irqs property\n");
 354                 return ret;
 355         }
 356
 357         mmp_icu_base = of_iomap(node, 0);
 358         if (!mmp_icu_base) {
 359                 pr_err("Failed to get interrupt controller register\n");
 360                 return -ENOMEM;
 361         }
 362
 363         icu_data[0].virq_base = 0;
 364         icu_data[0].domain = irq_domain_add_linear(node, nr_irqs,
 365                                                    &mmp_irq_domain_ops,
 366                                                    &icu_data[0]);
 367         for (irq = 0; irq < nr_irqs; irq++) {
 368                 ret = irq_create_mapping(icu_data[0].domain, irq);
 369                 if (!ret) {
 370                         pr_err("Failed to mapping hwirq\n");
 371                         goto err;
 372                 }
 373                 if (!irq)
 374                         icu_data[0].virq_base = ret;
 375         }
 376         icu_data[0].nr_irqs = nr_irqs;
 377         return 0;
 378 err:
 379         if (icu_data[0].virq_base) {
 380                 for (i = 0; i < irq; i++)
 381                         irq_dispose_mapping(icu_data[0].virq_base + i);
 382         }
 383         irq_domain_remove(icu_data[0].domain);
 384         iounmap(mmp_icu_base);
 385         return -EINVAL;
 386 }
 387
 388 static int __init mmp_of_init(struct device_node *node,
 389                               struct device_node *parent)
 390 {
 391         int ret;
 392
 393         ret = mmp_init_bases(node);
 394         if (ret < 0)
 395                 return ret;
 396
 397         icu_data[0].conf_enable = mmp_conf.conf_enable;
 398         icu_data[0].conf_disable = mmp_conf.conf_disable;
 399         icu_data[0].conf_mask = mmp_conf.conf_mask;
 400         irq_set_default_host(icu_data[0].domain);
 401         set_handle_irq(mmp_handle_irq);
 402         max_icu_nr = 1;
 403         return 0;
 404 }
 405 IRQCHIP_DECLARE(mmp_intc, "mrvl,mmp-intc", mmp_of_init);
 406
 407 static int __init mmp2_of_init(struct device_node *node,
 408                                struct device_node *parent)
 409 {
 410         int ret;
 411
 412         ret = mmp_init_bases(node);
 413         if (ret < 0)
 414                 return ret;
 415
 416         icu_data[0].conf_enable = mmp2_conf.conf_enable;
 417         icu_data[0].conf_disable = mmp2_conf.conf_disable;
 418         icu_data[0].conf_mask = mmp2_conf.conf_mask;
 419         irq_set_default_host(icu_data[0].domain);
 420         set_handle_irq(mmp2_handle_irq);
 421         max_icu_nr = 1;
 422         return 0;
 423 }
 424 IRQCHIP_DECLARE(mmp2_intc, "mrvl,mmp2-intc", mmp2_of_init);
 425
 426 static int __init mmp2_mux_of_init(struct device_node *node,
 427                                    struct device_node *parent)
 428 {
 429         struct resource res;
 430         int i, ret, irq, j = 0;
 431         u32 nr_irqs, mfp_irq;
 432
 433         if (!parent)
 434                 return -ENODEV;
 435
 436         i = max_icu_nr;
 437         ret = of_property_read_u32(node, "mrvl,intc-nr-irqs",
 438                                    &nr_irqs);
 439         if (ret) {
 440                 pr_err("Not found mrvl,intc-nr-irqs property\n");
 441                 return -EINVAL;
 442         }
 443         ret = of_address_to_resource(node, 0, &res);
 444         if (ret < 0) {
 445                 pr_err("Not found reg property\n");
 446                 return -EINVAL;
 447         }
 448         icu_data[i].reg_status = mmp_icu_base + res.start;
 449         ret = of_address_to_resource(node, 1, &res);
 450         if (ret < 0) {
 451                 pr_err("Not found reg property\n");
 452                 return -EINVAL;
 453         }
 454         icu_data[i].reg_mask = mmp_icu_base + res.start;
 455         icu_data[i].cascade_irq = irq_of_parse_and_map(node, 0);
 456         if (!icu_data[i].cascade_irq)
 457                 return -EINVAL;
 458
 459         icu_data[i].virq_base = 0;
 460         icu_data[i].domain = irq_domain_add_linear(node, nr_irqs,
 461                                                    &mmp_irq_domain_ops,
 462                                                    &icu_data[i]);
 463         for (irq = 0; irq < nr_irqs; irq++) {
 464                 ret = irq_create_mapping(icu_data[i].domain, irq);
 465                 if (!ret) {
 466                         pr_err("Failed to mapping hwirq\n");
 467                         goto err;
 468                 }
 469                 if (!irq)
 470                         icu_data[i].virq_base = ret;
 471         }
 472         icu_data[i].nr_irqs = nr_irqs;
 473         if (!of_property_read_u32(node, "mrvl,clr-mfp-irq",
 474                                   &mfp_irq)) {
 475                 icu_data[i].clr_mfp_irq_base = icu_data[i].virq_base;
 476                 icu_data[i].clr_mfp_hwirq = mfp_irq;
 477         }
 478         irq_set_chained_handler(icu_data[i].cascade_irq,
 479                                 icu_mux_irq_demux);
 480         max_icu_nr++;
 481         return 0;
 482 err:
 483         if (icu_data[i].virq_base) {
 484                 for (j = 0; j < irq; j++)
 485                         irq_dispose_mapping(icu_data[i].virq_base + j);
 486         }
 487         irq_domain_remove(icu_data[i].domain);
 488         return -EINVAL;
 489 }
 490 IRQCHIP_DECLARE(mmp2_mux_intc, "mrvl,mmp2-mux-intc", mmp2_mux_of_init);
 491 #endif