arch/arm/mach-lpc32xx/irq.c

   1 /*
   2  * arch/arm/mach-lpc32xx/irq.c
   3  *
   4  * Author: Kevin Wells <kevin.wells@nxp.com>
   5  *
   6  * Copyright (C) 2010 NXP Semiconductors
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/irq.h>
  23 #include <linux/err.h>
  24 #include <linux/io.h>
  25 #include <linux/of.h>
  26 #include <linux/of_address.h>
  27 #include <linux/of_irq.h>
  28 #include <linux/irqdomain.h>
  29 #include <linux/module.h>
  30
  31 #include <mach/irqs.h>
  32 #include <mach/hardware.h>
  33 #include <mach/platform.h>
  34 #include "common.h"
  35
  36 /*
  37  * Default value representing the Activation polarity of all internal
  38  * interrupt sources
  39  */
  40 #define MIC_APR_DEFAULT         0x3FF0EFE0
  41 #define SIC1_APR_DEFAULT        0xFBD27186
  42 #define SIC2_APR_DEFAULT        0x801810C0
  43
  44 /*
  45  * Default value representing the Activation Type of all internal
  46  * interrupt sources. All are level sensitive.
  47  */
  48 #define MIC_ATR_DEFAULT         0x00000000
  49 #define SIC1_ATR_DEFAULT        0x00026000
  50 #define SIC2_ATR_DEFAULT        0x00000000
  51
  52 static struct irq_domain *lpc32xx_mic_domain;
  53 static struct device_node *lpc32xx_mic_np;
  54
  55 struct lpc32xx_event_group_regs {
  56         void __iomem *enab_reg;
  57         void __iomem *edge_reg;
  58         void __iomem *maskstat_reg;
  59         void __iomem *rawstat_reg;
  60 };
  61
  62 static const struct lpc32xx_event_group_regs lpc32xx_event_int_regs = {
  63         .enab_reg = LPC32XX_CLKPWR_INT_ER,
  64         .edge_reg = LPC32XX_CLKPWR_INT_AP,
  65         .maskstat_reg = LPC32XX_CLKPWR_INT_SR,
  66         .rawstat_reg = LPC32XX_CLKPWR_INT_RS,
  67 };
  68
  69 static const struct lpc32xx_event_group_regs lpc32xx_event_pin_regs = {
  70         .enab_reg = LPC32XX_CLKPWR_PIN_ER,
  71         .edge_reg = LPC32XX_CLKPWR_PIN_AP,
  72         .maskstat_reg = LPC32XX_CLKPWR_PIN_SR,
  73         .rawstat_reg = LPC32XX_CLKPWR_PIN_RS,
  74 };
  75
  76 struct lpc32xx_event_info {
  77         const struct lpc32xx_event_group_regs *event_group;
  78         u32 mask;
  79 };
  80
  81 /*
  82  * Maps an IRQ number to and event mask and register
  83  */
  84 static const struct lpc32xx_event_info lpc32xx_events[NR_IRQS] = {
  85         [IRQ_LPC32XX_GPI_08] = {
  86                 .event_group = &lpc32xx_event_pin_regs,
  87                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_08_BIT,
  88         },
  89         [IRQ_LPC32XX_GPI_09] = {
  90                 .event_group = &lpc32xx_event_pin_regs,
  91                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_09_BIT,
  92         },
  93         [IRQ_LPC32XX_GPI_19] = {
  94                 .event_group = &lpc32xx_event_pin_regs,
  95                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_19_BIT,
  96         },
  97         [IRQ_LPC32XX_GPI_07] = {
  98                 .event_group = &lpc32xx_event_pin_regs,
  99                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_07_BIT,
 100         },
 101         [IRQ_LPC32XX_GPI_00] = {
 102                 .event_group = &lpc32xx_event_pin_regs,
 103                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_00_BIT,
 104         },
 105         [IRQ_LPC32XX_GPI_01] = {
 106                 .event_group = &lpc32xx_event_pin_regs,
 107                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_01_BIT,
 108         },
 109         [IRQ_LPC32XX_GPI_02] = {
 110                 .event_group = &lpc32xx_event_pin_regs,
 111                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_02_BIT,
 112         },
 113         [IRQ_LPC32XX_GPI_03] = {
 114                 .event_group = &lpc32xx_event_pin_regs,
 115                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_03_BIT,
 116         },
 117         [IRQ_LPC32XX_GPI_04] = {
 118                 .event_group = &lpc32xx_event_pin_regs,
 119                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_04_BIT,
 120         },
 121         [IRQ_LPC32XX_GPI_05] = {
 122                 .event_group = &lpc32xx_event_pin_regs,
 123                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_05_BIT,
 124         },
 125         [IRQ_LPC32XX_GPI_06] = {
 126                 .event_group = &lpc32xx_event_pin_regs,
 127                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_06_BIT,
 128         },
 129         [IRQ_LPC32XX_GPI_28] = {
 130                 .event_group = &lpc32xx_event_pin_regs,
 131                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_28_BIT,
 132         },
 133         [IRQ_LPC32XX_GPIO_00] = {
 134                 .event_group = &lpc32xx_event_int_regs,
 135                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_00_BIT,
 136         },
 137         [IRQ_LPC32XX_GPIO_01] = {
 138                 .event_group = &lpc32xx_event_int_regs,
 139                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_01_BIT,
 140         },
 141         [IRQ_LPC32XX_GPIO_02] = {
 142                 .event_group = &lpc32xx_event_int_regs,
 143                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_02_BIT,
 144         },
 145         [IRQ_LPC32XX_GPIO_03] = {
 146                 .event_group = &lpc32xx_event_int_regs,
 147                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_03_BIT,
 148         },
 149         [IRQ_LPC32XX_GPIO_04] = {
 150                 .event_group = &lpc32xx_event_int_regs,
 151                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_04_BIT,
 152         },
 153         [IRQ_LPC32XX_GPIO_05] = {
 154                 .event_group = &lpc32xx_event_int_regs,
 155                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_05_BIT,
 156         },
 157         [IRQ_LPC32XX_KEY] = {
 158                 .event_group = &lpc32xx_event_int_regs,
 159                 .mask = LPC32XX_CLKPWR_INTSRC_KEY_BIT,
 160         },
 161         [IRQ_LPC32XX_ETHERNET] = {
 162                 .event_group = &lpc32xx_event_int_regs,
 163                 .mask = LPC32XX_CLKPWR_INTSRC_MAC_BIT,
 164         },
 165         [IRQ_LPC32XX_USB_OTG_ATX] = {
 166                 .event_group = &lpc32xx_event_int_regs,
 167                 .mask = LPC32XX_CLKPWR_INTSRC_USBATXINT_BIT,
 168         },
 169         [IRQ_LPC32XX_USB_HOST] = {
 170                 .event_group = &lpc32xx_event_int_regs,
 171                 .mask = LPC32XX_CLKPWR_INTSRC_USB_BIT,
 172         },
 173         [IRQ_LPC32XX_RTC] = {
 174                 .event_group = &lpc32xx_event_int_regs,
 175                 .mask = LPC32XX_CLKPWR_INTSRC_RTC_BIT,
 176         },
 177         [IRQ_LPC32XX_MSTIMER] = {
 178                 .event_group = &lpc32xx_event_int_regs,
 179                 .mask = LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT,
 180         },
 181         [IRQ_LPC32XX_TS_AUX] = {
 182                 .event_group = &lpc32xx_event_int_regs,
 183                 .mask = LPC32XX_CLKPWR_INTSRC_TS_AUX_BIT,
 184         },
 185         [IRQ_LPC32XX_TS_P] = {
 186                 .event_group = &lpc32xx_event_int_regs,
 187                 .mask = LPC32XX_CLKPWR_INTSRC_TS_P_BIT,
 188         },
 189         [IRQ_LPC32XX_TS_IRQ] = {
 190                 .event_group = &lpc32xx_event_int_regs,
 191                 .mask = LPC32XX_CLKPWR_INTSRC_ADC_BIT,
 192         },
 193 };
 194
 195 static void get_controller(unsigned int irq, unsigned int *base,
 196         unsigned int *irqbit)
 197 {
 198         if (irq < 32) {
 199                 *base = LPC32XX_MIC_BASE;
 200                 *irqbit = 1 << irq;
 201         } else if (irq < 64) {
 202                 *base = LPC32XX_SIC1_BASE;
 203                 *irqbit = 1 << (irq - 32);
 204         } else {
 205                 *base = LPC32XX_SIC2_BASE;
 206                 *irqbit = 1 << (irq - 64);
 207         }
 208 }
 209
 210 static void lpc32xx_mask_irq(struct irq_data *d)
 211 {
 212         unsigned int reg, ctrl, mask;
 213
 214         get_controller(d->hwirq, &ctrl, &mask);
 215
 216         reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) & ~mask;
 217         __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
 218 }
 219
 220 static void lpc32xx_unmask_irq(struct irq_data *d)
 221 {
 222         unsigned int reg, ctrl, mask;
 223
 224         get_controller(d->hwirq, &ctrl, &mask);
 225
 226         reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) | mask;
 227         __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
 228 }
 229
 230 static void lpc32xx_ack_irq(struct irq_data *d)
 231 {
 232         unsigned int ctrl, mask;
 233
 234         get_controller(d->hwirq, &ctrl, &mask);
 235
 236         __raw_writel(mask, LPC32XX_INTC_RAW_STAT(ctrl));
 237
 238         /* Also need to clear pending wake event */
 239         if (lpc32xx_events[d->hwirq].mask != 0)
 240                 __raw_writel(lpc32xx_events[d->hwirq].mask,
 241                         lpc32xx_events[d->hwirq].event_group->rawstat_reg);
 242 }
 243
 244 static void __lpc32xx_set_irq_type(unsigned int irq, int use_high_level,
 245         int use_edge)
 246 {
 247         unsigned int reg, ctrl, mask;
 248
 249         get_controller(irq, &ctrl, &mask);
 250
 251         /* Activation level, high or low */
 252         reg = __raw_readl(LPC32XX_INTC_POLAR(ctrl));
 253         if (use_high_level)
 254                 reg |= mask;
 255         else
 256                 reg &= ~mask;
 257         __raw_writel(reg, LPC32XX_INTC_POLAR(ctrl));
 258
 259         /* Activation type, edge or level */
 260         reg = __raw_readl(LPC32XX_INTC_ACT_TYPE(ctrl));
 261         if (use_edge)
 262                 reg |= mask;
 263         else
 264                 reg &= ~mask;
 265         __raw_writel(reg, LPC32XX_INTC_ACT_TYPE(ctrl));
 266
 267         /* Use same polarity for the wake events */
 268         if (lpc32xx_events[irq].mask != 0) {
 269                 reg = __raw_readl(lpc32xx_events[irq].event_group->edge_reg);
 270
 271                 if (use_high_level)
 272                         reg |= lpc32xx_events[irq].mask;
 273                 else
 274                         reg &= ~lpc32xx_events[irq].mask;
 275
 276                 __raw_writel(reg, lpc32xx_events[irq].event_group->edge_reg);
 277         }
 278 }
 279
 280 static int lpc32xx_set_irq_type(struct irq_data *d, unsigned int type)
 281 {
 282         switch (type) {
 283         case IRQ_TYPE_EDGE_RISING:
 284                 /* Rising edge sensitive */
 285                 __lpc32xx_set_irq_type(d->hwirq, 1, 1);
 286                 __irq_set_handler_locked(d->hwirq, handle_edge_irq);
 287                 break;
 288
 289         case IRQ_TYPE_EDGE_FALLING:
 290                 /* Falling edge sensitive */
 291                 __lpc32xx_set_irq_type(d->hwirq, 0, 1);
 292                 __irq_set_handler_locked(d->hwirq, handle_edge_irq);
 293                 break;
 294
 295         case IRQ_TYPE_LEVEL_LOW:
 296                 /* Low level sensitive */
 297                 __lpc32xx_set_irq_type(d->hwirq, 0, 0);
 298                 __irq_set_handler_locked(d->hwirq, handle_level_irq);
 299                 break;
 300
 301         case IRQ_TYPE_LEVEL_HIGH:
 302                 /* High level sensitive */
 303                 __lpc32xx_set_irq_type(d->hwirq, 1, 0);
 304                 __irq_set_handler_locked(d->hwirq, handle_level_irq);
 305                 break;
 306
 307         /* Other modes are not supported */
 308         default:
 309                 return -EINVAL;
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int lpc32xx_irq_wake(struct irq_data *d, unsigned int state)
 316 {
 317         unsigned long eventreg;
 318
 319         if (lpc32xx_events[d->hwirq].mask != 0) {
 320                 eventreg = __raw_readl(lpc32xx_events[d->hwirq].
 321                         event_group->enab_reg);
 322
 323                 if (state)
 324                         eventreg |= lpc32xx_events[d->hwirq].mask;
 325                 else {
 326                         eventreg &= ~lpc32xx_events[d->hwirq].mask;
 327
 328                         /*
 329                          * When disabling the wakeup, clear the latched
 330                          * event
 331                          */
 332                         __raw_writel(lpc32xx_events[d->hwirq].mask,
 333                                 lpc32xx_events[d->hwirq].
 334                                 event_group->rawstat_reg);
 335                 }
 336
 337                 __raw_writel(eventreg,
 338                         lpc32xx_events[d->hwirq].event_group->enab_reg);
 339
 340                 return 0;
 341         }
 342
 343         /* Clear event */
 344         __raw_writel(lpc32xx_events[d->hwirq].mask,
 345                 lpc32xx_events[d->hwirq].event_group->rawstat_reg);
 346
 347         return -ENODEV;
 348 }
 349
 350 static void __init lpc32xx_set_default_mappings(unsigned int apr,
 351         unsigned int atr, unsigned int offset)
 352 {
 353         unsigned int i;
 354
 355         /* Set activation levels for each interrupt */
 356         i = 0;
 357         while (i < 32) {
 358                 __lpc32xx_set_irq_type(offset + i, ((apr >> i) & 0x1),
 359                         ((atr >> i) & 0x1));
 360                 i++;
 361         }
 362 }
 363
 364 static struct irq_chip lpc32xx_irq_chip = {
 365         .name = "MIC",
 366         .irq_ack = lpc32xx_ack_irq,
 367         .irq_mask = lpc32xx_mask_irq,
 368         .irq_unmask = lpc32xx_unmask_irq,
 369         .irq_set_type = lpc32xx_set_irq_type,
 370         .irq_set_wake = lpc32xx_irq_wake
 371 };
 372
 373 static void lpc32xx_sic1_handler(unsigned int irq, struct irq_desc *desc)
 374 {
 375         unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC1_BASE));
 376
 377         while (ints != 0) {
 378                 int irqno = fls(ints) - 1;
 379
 380                 ints &= ~(1 << irqno);
 381
 382                 generic_handle_irq(LPC32XX_SIC1_IRQ(irqno));
 383         }
 384 }
 385
 386 static void lpc32xx_sic2_handler(unsigned int irq, struct irq_desc *desc)
 387 {
 388         unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC2_BASE));
 389
 390         while (ints != 0) {
 391                 int irqno = fls(ints) - 1;
 392
 393                 ints &= ~(1 << irqno);
 394
 395                 generic_handle_irq(LPC32XX_SIC2_IRQ(irqno));
 396         }
 397 }
 398
 399 static int __init __lpc32xx_mic_of_init(struct device_node *node,
 400                                         struct device_node *parent)
 401 {
 402         lpc32xx_mic_np = node;
 403
 404         return 0;
 405 }
 406
 407 static const struct of_device_id mic_of_match[] __initconst = {
 408         { .compatible = "nxp,lpc3220-mic", .data = __lpc32xx_mic_of_init },
 409         { }
 410 };
 411
 412 void __init lpc32xx_init_irq(void)
 413 {
 414         unsigned int i;
 415         int irq_base;
 416
 417         /* Setup MIC */
 418         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
 419         __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_MIC_BASE));
 420         __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_MIC_BASE));
 421
 422         /* Setup SIC1 */
 423         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
 424         __raw_writel(SIC1_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC1_BASE));
 425         __raw_writel(SIC1_ATR_DEFAULT,
 426                                 LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC1_BASE));
 427
 428         /* Setup SIC2 */
 429         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
 430         __raw_writel(SIC2_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC2_BASE));
 431         __raw_writel(SIC2_ATR_DEFAULT,
 432                                 LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC2_BASE));
 433
 434         /* Configure supported IRQ's */
 435         for (i = 0; i < NR_IRQS; i++) {
 436                 irq_set_chip_and_handler(i, &lpc32xx_irq_chip,
 437                                          handle_level_irq);
 438                 set_irq_flags(i, IRQF_VALID);
 439         }
 440
 441         /* Set default mappings */
 442         lpc32xx_set_default_mappings(MIC_APR_DEFAULT, MIC_ATR_DEFAULT, 0);
 443         lpc32xx_set_default_mappings(SIC1_APR_DEFAULT, SIC1_ATR_DEFAULT, 32);
 444         lpc32xx_set_default_mappings(SIC2_APR_DEFAULT, SIC2_ATR_DEFAULT, 64);
 445
 446         /* mask all interrupts except SUBIRQ */
 447         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
 448         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
 449         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
 450
 451         /* MIC SUBIRQx interrupts will route handling to the chain handlers */
 452         irq_set_chained_handler(IRQ_LPC32XX_SUB1IRQ, lpc32xx_sic1_handler);
 453         irq_set_chained_handler(IRQ_LPC32XX_SUB2IRQ, lpc32xx_sic2_handler);
 454
 455         /* Initially disable all wake events */
 456         __raw_writel(0, LPC32XX_CLKPWR_P01_ER);
 457         __raw_writel(0, LPC32XX_CLKPWR_INT_ER);
 458         __raw_writel(0, LPC32XX_CLKPWR_PIN_ER);
 459
 460         /*
 461          * Default wake activation polarities, all pin sources are low edge
 462          * triggered
 463          */
 464         __raw_writel(LPC32XX_CLKPWR_INTSRC_TS_P_BIT |
 465                 LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT |
 466                 LPC32XX_CLKPWR_INTSRC_RTC_BIT,
 467                 LPC32XX_CLKPWR_INT_AP);
 468         __raw_writel(0, LPC32XX_CLKPWR_PIN_AP);
 469
 470         /* Clear latched wake event states */
 471         __raw_writel(__raw_readl(LPC32XX_CLKPWR_PIN_RS),
 472                 LPC32XX_CLKPWR_PIN_RS);
 473         __raw_writel(__raw_readl(LPC32XX_CLKPWR_INT_RS),
 474                 LPC32XX_CLKPWR_INT_RS);
 475
 476         of_irq_init(mic_of_match);
 477
 478         irq_base = irq_alloc_descs(-1, 0, NR_IRQS, 0);
 479         if (irq_base < 0) {
 480                 pr_warn("Cannot allocate irq_descs, assuming pre-allocated\n");
 481                 irq_base = 0;
 482         }
 483
 484         lpc32xx_mic_domain = irq_domain_add_legacy(lpc32xx_mic_np, NR_IRQS,
 485                                                    irq_base, 0,
 486                                                    &irq_domain_simple_ops,
 487                                                    NULL);
 488         if (!lpc32xx_mic_domain)
 489                 panic("Unable to add MIC irq domain\n");
 490 }