arch/arm/mach-mmp/irq.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/irqdomain.h>
  19 #include <linux/io.h>
  20 #include <linux/ioport.h>
  21 #include <linux/of_address.h>
  22 #include <linux/of_irq.h>
  23
  24 #include <mach/irqs.h>
  25
  26 #ifdef CONFIG_CPU_MMP2
  27 #include <mach/pm-mmp2.h>
  28 #endif
  29 #ifdef CONFIG_CPU_PXA910
  30 #include <mach/pm-pxa910.h>
  31 #endif
  32
  33 #include "common.h"
  34
  35 #define MAX_ICU_NR              16
  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 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 static 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(unsigned int irq, struct irq_desc *desc)
 133 {
 134         struct irq_domain *domain;
 135         struct icu_chip_data *data;
 136         int i;
 137         unsigned long mask, status, n;
 138
 139         for (i = 1; i < max_icu_nr; i++) {
 140                 if (irq == icu_data[i].cascade_irq) {
 141                         domain = icu_data[i].domain;
 142                         data = (struct icu_chip_data *)domain->host_data;
 143                         break;
 144                 }
 145         }
 146         if (i >= max_icu_nr) {
 147                 pr_err("Spurious irq %d in MMP INTC\n", irq);
 148                 return;
 149         }
 150
 151         mask = readl_relaxed(data->reg_mask);
 152         while (1) {
 153                 status = readl_relaxed(data->reg_status) & ~mask;
 154                 if (status == 0)
 155                         break;
 156                 n = find_first_bit(&status, BITS_PER_LONG);
 157                 while (n < BITS_PER_LONG) {
 158                         generic_handle_irq(icu_data[i].virq_base + n);
 159                         n = find_next_bit(&status, BITS_PER_LONG, n + 1);
 160                 }
 161         }
 162 }
 163
 164 static int mmp_irq_domain_map(struct irq_domain *d, unsigned int irq,
 165                               irq_hw_number_t hw)
 166 {
 167         irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
 168         set_irq_flags(irq, IRQF_VALID);
 169         return 0;
 170 }
 171
 172 static int mmp_irq_domain_xlate(struct irq_domain *d, struct device_node *node,
 173                                 const u32 *intspec, unsigned int intsize,
 174                                 unsigned long *out_hwirq,
 175                                 unsigned int *out_type)
 176 {
 177         *out_hwirq = intspec[0];
 178         return 0;
 179 }
 180
 181 const struct irq_domain_ops mmp_irq_domain_ops = {
 182         .map            = mmp_irq_domain_map,
 183         .xlate          = mmp_irq_domain_xlate,
 184 };
 185
 186 static struct mmp_intc_conf mmp_conf = {
 187         .conf_enable    = 0x51,
 188         .conf_disable   = 0x0,
 189         .conf_mask      = 0x7f,
 190 };
 191
 192 static struct mmp_intc_conf mmp2_conf = {
 193         .conf_enable    = 0x20,
 194         .conf_disable   = 0x0,
 195         .conf_mask      = 0x7f,
 196 };
 197
 198 /* MMP (ARMv5) */
 199 void __init icu_init_irq(void)
 200 {
 201         int irq;
 202
 203         max_icu_nr = 1;
 204         mmp_icu_base = ioremap(0xd4282000, 0x1000);
 205         icu_data[0].conf_enable = mmp_conf.conf_enable;
 206         icu_data[0].conf_disable = mmp_conf.conf_disable;
 207         icu_data[0].conf_mask = mmp_conf.conf_mask;
 208         icu_data[0].nr_irqs = 64;
 209         icu_data[0].virq_base = 0;
 210         icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0,
 211                                                    &irq_domain_simple_ops,
 212                                                    &icu_data[0]);
 213         for (irq = 0; irq < 64; irq++) {
 214                 icu_mask_irq(irq_get_irq_data(irq));
 215                 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
 216                 set_irq_flags(irq, IRQF_VALID);
 217         }
 218         irq_set_default_host(icu_data[0].domain);
 219 #ifdef CONFIG_CPU_PXA910
 220         icu_irq_chip.irq_set_wake = pxa910_set_wake;
 221 #endif
 222 }
 223
 224 /* MMP2 (ARMv7) */
 225 void __init mmp2_init_icu(void)
 226 {
 227         int irq;
 228
 229         max_icu_nr = 8;
 230         mmp_icu_base = ioremap(0xd4282000, 0x1000);
 231         icu_data[0].conf_enable = mmp2_conf.conf_enable;
 232         icu_data[0].conf_disable = mmp2_conf.conf_disable;
 233         icu_data[0].conf_mask = mmp2_conf.conf_mask;
 234         icu_data[0].nr_irqs = 64;
 235         icu_data[0].virq_base = 0;
 236         icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0,
 237                                                    &irq_domain_simple_ops,
 238                                                    &icu_data[0]);
 239         icu_data[1].reg_status = mmp_icu_base + 0x150;
 240         icu_data[1].reg_mask = mmp_icu_base + 0x168;
 241         icu_data[1].clr_mfp_irq_base = IRQ_MMP2_PMIC_BASE;
 242         icu_data[1].clr_mfp_hwirq = IRQ_MMP2_PMIC - IRQ_MMP2_PMIC_BASE;
 243         icu_data[1].nr_irqs = 2;
 244         icu_data[1].virq_base = IRQ_MMP2_PMIC_BASE;
 245         icu_data[1].domain = irq_domain_add_legacy(NULL, icu_data[1].nr_irqs,
 246                                                    icu_data[1].virq_base, 0,
 247                                                    &irq_domain_simple_ops,
 248                                                    &icu_data[1]);
 249         icu_data[2].reg_status = mmp_icu_base + 0x154;
 250         icu_data[2].reg_mask = mmp_icu_base + 0x16c;
 251         icu_data[2].nr_irqs = 2;
 252         icu_data[2].virq_base = IRQ_MMP2_RTC_BASE;
 253         icu_data[2].domain = irq_domain_add_legacy(NULL, icu_data[2].nr_irqs,
 254                                                    icu_data[2].virq_base, 0,
 255                                                    &irq_domain_simple_ops,
 256                                                    &icu_data[2]);
 257         icu_data[3].reg_status = mmp_icu_base + 0x180;
 258         icu_data[3].reg_mask = mmp_icu_base + 0x17c;
 259         icu_data[3].nr_irqs = 3;
 260         icu_data[3].virq_base = IRQ_MMP2_KEYPAD_BASE;
 261         icu_data[3].domain = irq_domain_add_legacy(NULL, icu_data[3].nr_irqs,
 262                                                    icu_data[3].virq_base, 0,
 263                                                    &irq_domain_simple_ops,
 264                                                    &icu_data[3]);
 265         icu_data[4].reg_status = mmp_icu_base + 0x158;
 266         icu_data[4].reg_mask = mmp_icu_base + 0x170;
 267         icu_data[4].nr_irqs = 5;
 268         icu_data[4].virq_base = IRQ_MMP2_TWSI_BASE;
 269         icu_data[4].domain = irq_domain_add_legacy(NULL, icu_data[4].nr_irqs,
 270                                                    icu_data[4].virq_base, 0,
 271                                                    &irq_domain_simple_ops,
 272                                                    &icu_data[4]);
 273         icu_data[5].reg_status = mmp_icu_base + 0x15c;
 274         icu_data[5].reg_mask = mmp_icu_base + 0x174;
 275         icu_data[5].nr_irqs = 15;
 276         icu_data[5].virq_base = IRQ_MMP2_MISC_BASE;
 277         icu_data[5].domain = irq_domain_add_legacy(NULL, icu_data[5].nr_irqs,
 278                                                    icu_data[5].virq_base, 0,
 279                                                    &irq_domain_simple_ops,
 280                                                    &icu_data[5]);
 281         icu_data[6].reg_status = mmp_icu_base + 0x160;
 282         icu_data[6].reg_mask = mmp_icu_base + 0x178;
 283         icu_data[6].nr_irqs = 2;
 284         icu_data[6].virq_base = IRQ_MMP2_MIPI_HSI1_BASE;
 285         icu_data[6].domain = irq_domain_add_legacy(NULL, icu_data[6].nr_irqs,
 286                                                    icu_data[6].virq_base, 0,
 287                                                    &irq_domain_simple_ops,
 288                                                    &icu_data[6]);
 289         icu_data[7].reg_status = mmp_icu_base + 0x188;
 290         icu_data[7].reg_mask = mmp_icu_base + 0x184;
 291         icu_data[7].nr_irqs = 2;
 292         icu_data[7].virq_base = IRQ_MMP2_MIPI_HSI0_BASE;
 293         icu_data[7].domain = irq_domain_add_legacy(NULL, icu_data[7].nr_irqs,
 294                                                    icu_data[7].virq_base, 0,
 295                                                    &irq_domain_simple_ops,
 296                                                    &icu_data[7]);
 297         for (irq = 0; irq < IRQ_MMP2_MUX_END; irq++) {
 298                 icu_mask_irq(irq_get_irq_data(irq));
 299                 switch (irq) {
 300                 case IRQ_MMP2_PMIC_MUX:
 301                 case IRQ_MMP2_RTC_MUX:
 302                 case IRQ_MMP2_KEYPAD_MUX:
 303                 case IRQ_MMP2_TWSI_MUX:
 304                 case IRQ_MMP2_MISC_MUX:
 305                 case IRQ_MMP2_MIPI_HSI1_MUX:
 306                 case IRQ_MMP2_MIPI_HSI0_MUX:
 307                         irq_set_chip(irq, &icu_irq_chip);
 308                         irq_set_chained_handler(irq, icu_mux_irq_demux);
 309                         break;
 310                 default:
 311                         irq_set_chip_and_handler(irq, &icu_irq_chip,
 312                                                  handle_level_irq);
 313                         break;
 314                 }
 315                 set_irq_flags(irq, IRQF_VALID);
 316         }
 317         irq_set_default_host(icu_data[0].domain);
 318 #ifdef CONFIG_CPU_MMP2
 319         icu_irq_chip.irq_set_wake = mmp2_set_wake;
 320 #endif
 321 }
 322
 323 #ifdef CONFIG_OF
 324 static const struct of_device_id intc_ids[] __initconst = {
 325         { .compatible = "mrvl,mmp-intc", .data = &mmp_conf },
 326         { .compatible = "mrvl,mmp2-intc", .data = &mmp2_conf },
 327         {}
 328 };
 329
 330 static const struct of_device_id mmp_mux_irq_match[] __initconst = {
 331         { .compatible = "mrvl,mmp2-mux-intc" },
 332         {}
 333 };
 334
 335 int __init mmp2_mux_init(struct device_node *parent)
 336 {
 337         struct device_node *node;
 338         const struct of_device_id *of_id;
 339         struct resource res;
 340         int i, irq_base, ret, irq;
 341         u32 nr_irqs, mfp_irq;
 342
 343         node = parent;
 344         max_icu_nr = 1;
 345         for (i = 1; i < MAX_ICU_NR; i++) {
 346                 node = of_find_matching_node(node, mmp_mux_irq_match);
 347                 if (!node)
 348                         break;
 349                 of_id = of_match_node(&mmp_mux_irq_match[0], node);
 350                 ret = of_property_read_u32(node, "mrvl,intc-nr-irqs",
 351                                            &nr_irqs);
 352                 if (ret) {
 353                         pr_err("Not found mrvl,intc-nr-irqs property\n");
 354                         ret = -EINVAL;
 355                         goto err;
 356                 }
 357                 ret = of_address_to_resource(node, 0, &res);
 358                 if (ret < 0) {
 359                         pr_err("Not found reg property\n");
 360                         ret = -EINVAL;
 361                         goto err;
 362                 }
 363                 icu_data[i].reg_status = mmp_icu_base + res.start;
 364                 ret = of_address_to_resource(node, 1, &res);
 365                 if (ret < 0) {
 366                         pr_err("Not found reg property\n");
 367                         ret = -EINVAL;
 368                         goto err;
 369                 }
 370                 icu_data[i].reg_mask = mmp_icu_base + res.start;
 371                 icu_data[i].cascade_irq = irq_of_parse_and_map(node, 0);
 372                 if (!icu_data[i].cascade_irq) {
 373                         ret = -EINVAL;
 374                         goto err;
 375                 }
 376
 377                 irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
 378                 if (irq_base < 0) {
 379                         pr_err("Failed to allocate IRQ numbers for mux intc\n");
 380                         ret = irq_base;
 381                         goto err;
 382                 }
 383                 if (!of_property_read_u32(node, "mrvl,clr-mfp-irq",
 384                                           &mfp_irq)) {
 385                         icu_data[i].clr_mfp_irq_base = irq_base;
 386                         icu_data[i].clr_mfp_hwirq = mfp_irq;
 387                 }
 388                 irq_set_chained_handler(icu_data[i].cascade_irq,
 389                                         icu_mux_irq_demux);
 390                 icu_data[i].nr_irqs = nr_irqs;
 391                 icu_data[i].virq_base = irq_base;
 392                 icu_data[i].domain = irq_domain_add_legacy(node, nr_irqs,
 393                                                            irq_base, 0,
 394                                                            &mmp_irq_domain_ops,
 395                                                            &icu_data[i]);
 396                 for (irq = irq_base; irq < irq_base + nr_irqs; irq++)
 397                         icu_mask_irq(irq_get_irq_data(irq));
 398         }
 399         max_icu_nr = i;
 400         return 0;
 401 err:
 402         of_node_put(node);
 403         max_icu_nr = i;
 404         return ret;
 405 }
 406
 407 void __init mmp_dt_irq_init(void)
 408 {
 409         struct device_node *node;
 410         const struct of_device_id *of_id;
 411         struct mmp_intc_conf *conf;
 412         int nr_irqs, irq_base, ret, irq;
 413
 414         node = of_find_matching_node(NULL, intc_ids);
 415         if (!node) {
 416                 pr_err("Failed to find interrupt controller in arch-mmp\n");
 417                 return;
 418         }
 419         of_id = of_match_node(intc_ids, node);
 420         conf = of_id->data;
 421
 422         ret = of_property_read_u32(node, "mrvl,intc-nr-irqs", &nr_irqs);
 423         if (ret) {
 424                 pr_err("Not found mrvl,intc-nr-irqs property\n");
 425                 return;
 426         }
 427
 428         mmp_icu_base = of_iomap(node, 0);
 429         if (!mmp_icu_base) {
 430                 pr_err("Failed to get interrupt controller register\n");
 431                 return;
 432         }
 433
 434         irq_base = irq_alloc_descs(-1, 0, nr_irqs - NR_IRQS_LEGACY, 0);
 435         if (irq_base < 0) {
 436                 pr_err("Failed to allocate IRQ numbers\n");
 437                 goto err;
 438         } else if (irq_base != NR_IRQS_LEGACY) {
 439                 pr_err("ICU's irqbase should be started from 0\n");
 440                 goto err;
 441         }
 442         icu_data[0].conf_enable = conf->conf_enable;
 443         icu_data[0].conf_disable = conf->conf_disable;
 444         icu_data[0].conf_mask = conf->conf_mask;
 445         icu_data[0].nr_irqs = nr_irqs;
 446         icu_data[0].virq_base = 0;
 447         icu_data[0].domain = irq_domain_add_legacy(node, nr_irqs, 0, 0,
 448                                                    &mmp_irq_domain_ops,
 449                                                    &icu_data[0]);
 450         irq_set_default_host(icu_data[0].domain);
 451         for (irq = 0; irq < nr_irqs; irq++)
 452                 icu_mask_irq(irq_get_irq_data(irq));
 453         mmp2_mux_init(node);
 454         return;
 455 err:
 456         iounmap(mmp_icu_base);
 457 }
 458 #endif