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
  26 #include <mach/irqs.h>
  27 #include <mach/hardware.h>
  28 #include <mach/platform.h>
  29 #include "common.h"
  30
  31 /*
  32  * Default value representing the Activation polarity of all internal
  33  * interrupt sources
  34  */
  35 #define MIC_APR_DEFAULT         0x3FF0EFE0
  36 #define SIC1_APR_DEFAULT        0xFBD27186
  37 #define SIC2_APR_DEFAULT        0x801810C0
  38
  39 /*
  40  * Default value representing the Activation Type of all internal
  41  * interrupt sources. All are level sensitive.
  42  */
  43 #define MIC_ATR_DEFAULT         0x00000000
  44 #define SIC1_ATR_DEFAULT        0x00026000
  45 #define SIC2_ATR_DEFAULT        0x00000000
  46
  47 struct lpc32xx_event_group_regs {
  48         void __iomem *enab_reg;
  49         void __iomem *edge_reg;
  50         void __iomem *maskstat_reg;
  51         void __iomem *rawstat_reg;
  52 };
  53
  54 static const struct lpc32xx_event_group_regs lpc32xx_event_int_regs = {
  55         .enab_reg = LPC32XX_CLKPWR_INT_ER,
  56         .edge_reg = LPC32XX_CLKPWR_INT_AP,
  57         .maskstat_reg = LPC32XX_CLKPWR_INT_SR,
  58         .rawstat_reg = LPC32XX_CLKPWR_INT_RS,
  59 };
  60
  61 static const struct lpc32xx_event_group_regs lpc32xx_event_pin_regs = {
  62         .enab_reg = LPC32XX_CLKPWR_PIN_ER,
  63         .edge_reg = LPC32XX_CLKPWR_PIN_AP,
  64         .maskstat_reg = LPC32XX_CLKPWR_PIN_SR,
  65         .rawstat_reg = LPC32XX_CLKPWR_PIN_RS,
  66 };
  67
  68 struct lpc32xx_event_info {
  69         const struct lpc32xx_event_group_regs *event_group;
  70         u32 mask;
  71 };
  72
  73 /*
  74  * Maps an IRQ number to and event mask and register
  75  */
  76 static const struct lpc32xx_event_info lpc32xx_events[NR_IRQS] = {
  77         [IRQ_LPC32XX_GPI_08] = {
  78                 .event_group = &lpc32xx_event_pin_regs,
  79                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_08_BIT,
  80         },
  81         [IRQ_LPC32XX_GPI_09] = {
  82                 .event_group = &lpc32xx_event_pin_regs,
  83                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_09_BIT,
  84         },
  85         [IRQ_LPC32XX_GPI_19] = {
  86                 .event_group = &lpc32xx_event_pin_regs,
  87                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_19_BIT,
  88         },
  89         [IRQ_LPC32XX_GPI_07] = {
  90                 .event_group = &lpc32xx_event_pin_regs,
  91                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_07_BIT,
  92         },
  93         [IRQ_LPC32XX_GPI_00] = {
  94                 .event_group = &lpc32xx_event_pin_regs,
  95                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_00_BIT,
  96         },
  97         [IRQ_LPC32XX_GPI_01] = {
  98                 .event_group = &lpc32xx_event_pin_regs,
  99                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_01_BIT,
 100         },
 101         [IRQ_LPC32XX_GPI_02] = {
 102                 .event_group = &lpc32xx_event_pin_regs,
 103                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_02_BIT,
 104         },
 105         [IRQ_LPC32XX_GPI_03] = {
 106                 .event_group = &lpc32xx_event_pin_regs,
 107                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_03_BIT,
 108         },
 109         [IRQ_LPC32XX_GPI_04] = {
 110                 .event_group = &lpc32xx_event_pin_regs,
 111                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_04_BIT,
 112         },
 113         [IRQ_LPC32XX_GPI_05] = {
 114                 .event_group = &lpc32xx_event_pin_regs,
 115                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_05_BIT,
 116         },
 117         [IRQ_LPC32XX_GPI_06] = {
 118                 .event_group = &lpc32xx_event_pin_regs,
 119                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_06_BIT,
 120         },
 121         [IRQ_LPC32XX_GPIO_00] = {
 122                 .event_group = &lpc32xx_event_int_regs,
 123                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_00_BIT,
 124         },
 125         [IRQ_LPC32XX_GPIO_01] = {
 126                 .event_group = &lpc32xx_event_int_regs,
 127                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_01_BIT,
 128         },
 129         [IRQ_LPC32XX_GPIO_02] = {
 130                 .event_group = &lpc32xx_event_int_regs,
 131                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_02_BIT,
 132         },
 133         [IRQ_LPC32XX_GPIO_03] = {
 134                 .event_group = &lpc32xx_event_int_regs,
 135                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_03_BIT,
 136         },
 137         [IRQ_LPC32XX_GPIO_04] = {
 138                 .event_group = &lpc32xx_event_int_regs,
 139                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_04_BIT,
 140         },
 141         [IRQ_LPC32XX_GPIO_05] = {
 142                 .event_group = &lpc32xx_event_int_regs,
 143                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_05_BIT,
 144         },
 145         [IRQ_LPC32XX_KEY] = {
 146                 .event_group = &lpc32xx_event_int_regs,
 147                 .mask = LPC32XX_CLKPWR_INTSRC_KEY_BIT,
 148         },
 149         [IRQ_LPC32XX_USB_OTG_ATX] = {
 150                 .event_group = &lpc32xx_event_int_regs,
 151                 .mask = LPC32XX_CLKPWR_INTSRC_USBATXINT_BIT,
 152         },
 153         [IRQ_LPC32XX_USB_HOST] = {
 154                 .event_group = &lpc32xx_event_int_regs,
 155                 .mask = LPC32XX_CLKPWR_INTSRC_USB_BIT,
 156         },
 157         [IRQ_LPC32XX_RTC] = {
 158                 .event_group = &lpc32xx_event_int_regs,
 159                 .mask = LPC32XX_CLKPWR_INTSRC_RTC_BIT,
 160         },
 161         [IRQ_LPC32XX_MSTIMER] = {
 162                 .event_group = &lpc32xx_event_int_regs,
 163                 .mask = LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT,
 164         },
 165         [IRQ_LPC32XX_TS_AUX] = {
 166                 .event_group = &lpc32xx_event_int_regs,
 167                 .mask = LPC32XX_CLKPWR_INTSRC_TS_AUX_BIT,
 168         },
 169         [IRQ_LPC32XX_TS_P] = {
 170                 .event_group = &lpc32xx_event_int_regs,
 171                 .mask = LPC32XX_CLKPWR_INTSRC_TS_P_BIT,
 172         },
 173         [IRQ_LPC32XX_TS_IRQ] = {
 174                 .event_group = &lpc32xx_event_int_regs,
 175                 .mask = LPC32XX_CLKPWR_INTSRC_ADC_BIT,
 176         },
 177 };
 178
 179 static void get_controller(unsigned int irq, unsigned int *base,
 180         unsigned int *irqbit)
 181 {
 182         if (irq < 32) {
 183                 *base = LPC32XX_MIC_BASE;
 184                 *irqbit = 1 << irq;
 185         } else if (irq < 64) {
 186                 *base = LPC32XX_SIC1_BASE;
 187                 *irqbit = 1 << (irq - 32);
 188         } else {
 189                 *base = LPC32XX_SIC2_BASE;
 190                 *irqbit = 1 << (irq - 64);
 191         }
 192 }
 193
 194 static void lpc32xx_mask_irq(struct irq_data *d)
 195 {
 196         unsigned int reg, ctrl, mask;
 197
 198         get_controller(d->irq, &ctrl, &mask);
 199
 200         reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) & ~mask;
 201         __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
 202 }
 203
 204 static void lpc32xx_unmask_irq(struct irq_data *d)
 205 {
 206         unsigned int reg, ctrl, mask;
 207
 208         get_controller(d->irq, &ctrl, &mask);
 209
 210         reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) | mask;
 211         __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
 212 }
 213
 214 static void lpc32xx_ack_irq(struct irq_data *d)
 215 {
 216         unsigned int ctrl, mask;
 217
 218         get_controller(d->irq, &ctrl, &mask);
 219
 220         __raw_writel(mask, LPC32XX_INTC_RAW_STAT(ctrl));
 221
 222         /* Also need to clear pending wake event */
 223         if (lpc32xx_events[d->irq].mask != 0)
 224                 __raw_writel(lpc32xx_events[d->irq].mask,
 225                         lpc32xx_events[d->irq].event_group->rawstat_reg);
 226 }
 227
 228 static void __lpc32xx_set_irq_type(unsigned int irq, int use_high_level,
 229         int use_edge)
 230 {
 231         unsigned int reg, ctrl, mask;
 232
 233         get_controller(irq, &ctrl, &mask);
 234
 235         /* Activation level, high or low */
 236         reg = __raw_readl(LPC32XX_INTC_POLAR(ctrl));
 237         if (use_high_level)
 238                 reg |= mask;
 239         else
 240                 reg &= ~mask;
 241         __raw_writel(reg, LPC32XX_INTC_POLAR(ctrl));
 242
 243         /* Activation type, edge or level */
 244         reg = __raw_readl(LPC32XX_INTC_ACT_TYPE(ctrl));
 245         if (use_edge)
 246                 reg |= mask;
 247         else
 248                 reg &= ~mask;
 249         __raw_writel(reg, LPC32XX_INTC_ACT_TYPE(ctrl));
 250
 251         /* Use same polarity for the wake events */
 252         if (lpc32xx_events[irq].mask != 0) {
 253                 reg = __raw_readl(lpc32xx_events[irq].event_group->edge_reg);
 254
 255                 if (use_high_level)
 256                         reg |= lpc32xx_events[irq].mask;
 257                 else
 258                         reg &= ~lpc32xx_events[irq].mask;
 259
 260                 __raw_writel(reg, lpc32xx_events[irq].event_group->edge_reg);
 261         }
 262 }
 263
 264 static int lpc32xx_set_irq_type(struct irq_data *d, unsigned int type)
 265 {
 266         switch (type) {
 267         case IRQ_TYPE_EDGE_RISING:
 268                 /* Rising edge sensitive */
 269                 __lpc32xx_set_irq_type(d->irq, 1, 1);
 270                 break;
 271
 272         case IRQ_TYPE_EDGE_FALLING:
 273                 /* Falling edge sensitive */
 274                 __lpc32xx_set_irq_type(d->irq, 0, 1);
 275                 break;
 276
 277         case IRQ_TYPE_LEVEL_LOW:
 278                 /* Low level sensitive */
 279                 __lpc32xx_set_irq_type(d->irq, 0, 0);
 280                 break;
 281
 282         case IRQ_TYPE_LEVEL_HIGH:
 283                 /* High level sensitive */
 284                 __lpc32xx_set_irq_type(d->irq, 1, 0);
 285                 break;
 286
 287         /* Other modes are not supported */
 288         default:
 289                 return -EINVAL;
 290         }
 291
 292         /* Ok to use the level handler for all types */
 293         irq_set_handler(d->irq, handle_level_irq);
 294
 295         return 0;
 296 }
 297
 298 static int lpc32xx_irq_wake(struct irq_data *d, unsigned int state)
 299 {
 300         unsigned long eventreg;
 301
 302         if (lpc32xx_events[d->irq].mask != 0) {
 303                 eventreg = __raw_readl(lpc32xx_events[d->irq].
 304                         event_group->enab_reg);
 305
 306                 if (state)
 307                         eventreg |= lpc32xx_events[d->irq].mask;
 308                 else
 309                         eventreg &= ~lpc32xx_events[d->irq].mask;
 310
 311                 __raw_writel(eventreg,
 312                         lpc32xx_events[d->irq].event_group->enab_reg);
 313
 314                 return 0;
 315         }
 316
 317         /* Clear event */
 318         __raw_writel(lpc32xx_events[d->irq].mask,
 319                 lpc32xx_events[d->irq].event_group->rawstat_reg);
 320
 321         return -ENODEV;
 322 }
 323
 324 static void __init lpc32xx_set_default_mappings(unsigned int apr,
 325         unsigned int atr, unsigned int offset)
 326 {
 327         unsigned int i;
 328
 329         /* Set activation levels for each interrupt */
 330         i = 0;
 331         while (i < 32) {
 332                 __lpc32xx_set_irq_type(offset + i, ((apr >> i) & 0x1),
 333                         ((atr >> i) & 0x1));
 334                 i++;
 335         }
 336 }
 337
 338 static struct irq_chip lpc32xx_irq_chip = {
 339         .irq_ack = lpc32xx_ack_irq,
 340         .irq_mask = lpc32xx_mask_irq,
 341         .irq_unmask = lpc32xx_unmask_irq,
 342         .irq_set_type = lpc32xx_set_irq_type,
 343         .irq_set_wake = lpc32xx_irq_wake
 344 };
 345
 346 static void lpc32xx_sic1_handler(unsigned int irq, struct irq_desc *desc)
 347 {
 348         unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC1_BASE));
 349
 350         while (ints != 0) {
 351                 int irqno = fls(ints) - 1;
 352
 353                 ints &= ~(1 << irqno);
 354
 355                 generic_handle_irq(LPC32XX_SIC1_IRQ(irqno));
 356         }
 357 }
 358
 359 static void lpc32xx_sic2_handler(unsigned int irq, struct irq_desc *desc)
 360 {
 361         unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC2_BASE));
 362
 363         while (ints != 0) {
 364                 int irqno = fls(ints) - 1;
 365
 366                 ints &= ~(1 << irqno);
 367
 368                 generic_handle_irq(LPC32XX_SIC2_IRQ(irqno));
 369         }
 370 }
 371
 372 void __init lpc32xx_init_irq(void)
 373 {
 374         unsigned int i;
 375
 376         /* Setup MIC */
 377         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
 378         __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_MIC_BASE));
 379         __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_MIC_BASE));
 380
 381         /* Setup SIC1 */
 382         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
 383         __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC1_BASE));
 384         __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC1_BASE));
 385
 386         /* Setup SIC2 */
 387         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
 388         __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC2_BASE));
 389         __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC2_BASE));
 390
 391         /* Configure supported IRQ's */
 392         for (i = 0; i < NR_IRQS; i++) {
 393                 irq_set_chip_and_handler(i, &lpc32xx_irq_chip,
 394                                          handle_level_irq);
 395                 set_irq_flags(i, IRQF_VALID);
 396         }
 397
 398         /* Set default mappings */
 399         lpc32xx_set_default_mappings(MIC_APR_DEFAULT, MIC_ATR_DEFAULT, 0);
 400         lpc32xx_set_default_mappings(SIC1_APR_DEFAULT, SIC1_ATR_DEFAULT, 32);
 401         lpc32xx_set_default_mappings(SIC2_APR_DEFAULT, SIC2_ATR_DEFAULT, 64);
 402
 403         /* mask all interrupts except SUBIRQ */
 404         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
 405         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
 406         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
 407
 408         /* MIC SUBIRQx interrupts will route handling to the chain handlers */
 409         irq_set_chained_handler(IRQ_LPC32XX_SUB1IRQ, lpc32xx_sic1_handler);
 410         irq_set_chained_handler(IRQ_LPC32XX_SUB2IRQ, lpc32xx_sic2_handler);
 411
 412         /* Initially disable all wake events */
 413         __raw_writel(0, LPC32XX_CLKPWR_P01_ER);
 414         __raw_writel(0, LPC32XX_CLKPWR_INT_ER);
 415         __raw_writel(0, LPC32XX_CLKPWR_PIN_ER);
 416
 417         /*
 418          * Default wake activation polarities, all pin sources are low edge
 419          * triggered
 420          */
 421         __raw_writel(LPC32XX_CLKPWR_INTSRC_TS_P_BIT |
 422                 LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT |
 423                 LPC32XX_CLKPWR_INTSRC_RTC_BIT,
 424                 LPC32XX_CLKPWR_INT_AP);
 425         __raw_writel(0, LPC32XX_CLKPWR_PIN_AP);
 426
 427         /* Clear latched wake event states */
 428         __raw_writel(__raw_readl(LPC32XX_CLKPWR_PIN_RS),
 429                 LPC32XX_CLKPWR_PIN_RS);
 430         __raw_writel(__raw_readl(LPC32XX_CLKPWR_INT_RS),
 431                 LPC32XX_CLKPWR_INT_RS);
 432 }