drivers/irqchip/irq-omap-intc.c

   1 /*
   2  * linux/arch/arm/mach-omap2/irq.c
   3  *
   4  * Interrupt handler for OMAP2 boards.
   5  *
   6  * Copyright (C) 2005 Nokia Corporation
   7  * Author: Paul Mundt <paul.mundt@nokia.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License. See the file "COPYING" in the main directory of this archive
  11  * for more details.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18
  19 #include <asm/exception.h>
  20 #include <linux/irqchip.h>
  21 #include <linux/irqdomain.h>
  22 #include <linux/of.h>
  23 #include <linux/of_address.h>
  24 #include <linux/of_irq.h>
  25
  26 /* Define these here for now until we drop all board-files */
  27 #define OMAP24XX_IC_BASE        0x480fe000
  28 #define OMAP34XX_IC_BASE        0x48200000
  29
  30 /* selected INTC register offsets */
  31
  32 #define INTC_REVISION           0x0000
  33 #define INTC_SYSCONFIG          0x0010
  34 #define INTC_SYSSTATUS          0x0014
  35 #define INTC_SIR                0x0040
  36 #define INTC_CONTROL            0x0048
  37 #define INTC_PROTECTION         0x004C
  38 #define INTC_IDLE               0x0050
  39 #define INTC_THRESHOLD          0x0068
  40 #define INTC_MIR0               0x0084
  41 #define INTC_MIR_CLEAR0         0x0088
  42 #define INTC_MIR_SET0           0x008c
  43 #define INTC_PENDING_IRQ0       0x0098
  44 #define INTC_PENDING_IRQ1       0x00b8
  45 #define INTC_PENDING_IRQ2       0x00d8
  46 #define INTC_PENDING_IRQ3       0x00f8
  47 #define INTC_ILR0               0x0100
  48
  49 #define ACTIVEIRQ_MASK          0x7f    /* omap2/3 active interrupt bits */
  50 #define INTCPS_NR_ILR_REGS      128
  51 #define INTCPS_NR_MIR_REGS      4
  52
  53 #define INTC_IDLE_FUNCIDLE      (1 << 0)
  54 #define INTC_IDLE_TURBO         (1 << 1)
  55
  56 #define INTC_PROTECTION_ENABLE  (1 << 0)
  57
  58 struct omap_intc_regs {
  59         u32 sysconfig;
  60         u32 protection;
  61         u32 idle;
  62         u32 threshold;
  63         u32 ilr[INTCPS_NR_ILR_REGS];
  64         u32 mir[INTCPS_NR_MIR_REGS];
  65 };
  66 static struct omap_intc_regs intc_context;
  67
  68 static struct irq_domain *domain;
  69 static void __iomem *omap_irq_base;
  70 static int omap_nr_pending = 3;
  71 static int omap_nr_irqs = 96;
  72
  73 static void intc_writel(u32 reg, u32 val)
  74 {
  75         writel_relaxed(val, omap_irq_base + reg);
  76 }
  77
  78 static u32 intc_readl(u32 reg)
  79 {
  80         return readl_relaxed(omap_irq_base + reg);
  81 }
  82
  83 void omap_intc_save_context(void)
  84 {
  85         int i;
  86
  87         intc_context.sysconfig =
  88                 intc_readl(INTC_SYSCONFIG);
  89         intc_context.protection =
  90                 intc_readl(INTC_PROTECTION);
  91         intc_context.idle =
  92                 intc_readl(INTC_IDLE);
  93         intc_context.threshold =
  94                 intc_readl(INTC_THRESHOLD);
  95
  96         for (i = 0; i < omap_nr_irqs; i++)
  97                 intc_context.ilr[i] =
  98                         intc_readl((INTC_ILR0 + 0x4 * i));
  99         for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
 100                 intc_context.mir[i] =
 101                         intc_readl(INTC_MIR0 + (0x20 * i));
 102 }
 103
 104 void omap_intc_restore_context(void)
 105 {
 106         int i;
 107
 108         intc_writel(INTC_SYSCONFIG, intc_context.sysconfig);
 109         intc_writel(INTC_PROTECTION, intc_context.protection);
 110         intc_writel(INTC_IDLE, intc_context.idle);
 111         intc_writel(INTC_THRESHOLD, intc_context.threshold);
 112
 113         for (i = 0; i < omap_nr_irqs; i++)
 114                 intc_writel(INTC_ILR0 + 0x4 * i,
 115                                 intc_context.ilr[i]);
 116
 117         for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
 118                 intc_writel(INTC_MIR0 + 0x20 * i,
 119                         intc_context.mir[i]);
 120         /* MIRs are saved and restore with other PRCM registers */
 121 }
 122
 123 void omap3_intc_prepare_idle(void)
 124 {
 125         /*
 126          * Disable autoidle as it can stall interrupt controller,
 127          * cf. errata ID i540 for 3430 (all revisions up to 3.1.x)
 128          */
 129         intc_writel(INTC_SYSCONFIG, 0);
 130         intc_writel(INTC_IDLE, INTC_IDLE_TURBO);
 131 }
 132
 133 void omap3_intc_resume_idle(void)
 134 {
 135         /* Re-enable autoidle */
 136         intc_writel(INTC_SYSCONFIG, 1);
 137         intc_writel(INTC_IDLE, 0);
 138 }
 139
 140 /* XXX: FIQ and additional INTC support (only MPU at the moment) */
 141 static void omap_ack_irq(struct irq_data *d)
 142 {
 143         intc_writel(INTC_CONTROL, 0x1);
 144 }
 145
 146 static void omap_mask_ack_irq(struct irq_data *d)
 147 {
 148         irq_gc_mask_disable_reg(d);
 149         omap_ack_irq(d);
 150 }
 151
 152 static void __init omap_irq_soft_reset(void)
 153 {
 154         unsigned long tmp;
 155
 156         tmp = intc_readl(INTC_REVISION) & 0xff;
 157
 158         pr_info("IRQ: Found an INTC at 0x%p (revision %ld.%ld) with %d interrupts\n",
 159                 omap_irq_base, tmp >> 4, tmp & 0xf, omap_nr_irqs);
 160
 161         tmp = intc_readl(INTC_SYSCONFIG);
 162         tmp |= 1 << 1;  /* soft reset */
 163         intc_writel(INTC_SYSCONFIG, tmp);
 164
 165         while (!(intc_readl(INTC_SYSSTATUS) & 0x1))
 166                 /* Wait for reset to complete */;
 167
 168         /* Enable autoidle */
 169         intc_writel(INTC_SYSCONFIG, 1 << 0);
 170 }
 171
 172 int omap_irq_pending(void)
 173 {
 174         int i;
 175
 176         for (i = 0; i < omap_nr_pending; i++)
 177                 if (intc_readl(INTC_PENDING_IRQ0 + (0x20 * i)))
 178                         return 1;
 179         return 0;
 180 }
 181
 182 void omap3_intc_suspend(void)
 183 {
 184         /* A pending interrupt would prevent OMAP from entering suspend */
 185         omap_ack_irq(NULL);
 186 }
 187
 188 static int __init omap_alloc_gc_of(struct irq_domain *d, void __iomem *base)
 189 {
 190         int ret;
 191         int i;
 192
 193         ret = irq_alloc_domain_generic_chips(d, 32, 1, "INTC",
 194                         handle_level_irq, IRQ_NOREQUEST | IRQ_NOPROBE,
 195                         IRQ_LEVEL, 0);
 196         if (ret) {
 197                 pr_warn("Failed to allocate irq chips\n");
 198                 return ret;
 199         }
 200
 201         for (i = 0; i < omap_nr_pending; i++) {
 202                 struct irq_chip_generic *gc;
 203                 struct irq_chip_type *ct;
 204
 205                 gc = irq_get_domain_generic_chip(d, 32 * i);
 206                 gc->reg_base = base;
 207                 ct = gc->chip_types;
 208
 209                 ct->type = IRQ_TYPE_LEVEL_MASK;
 210
 211                 ct->chip.irq_ack = omap_mask_ack_irq;
 212                 ct->chip.irq_mask = irq_gc_mask_disable_reg;
 213                 ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
 214
 215                 ct->chip.flags |= IRQCHIP_SKIP_SET_WAKE;
 216
 217                 ct->regs.enable = INTC_MIR_CLEAR0 + 32 * i;
 218                 ct->regs.disable = INTC_MIR_SET0 + 32 * i;
 219         }
 220
 221         return 0;
 222 }
 223
 224 static void __init omap_alloc_gc_legacy(void __iomem *base,
 225                 unsigned int irq_start, unsigned int num)
 226 {
 227         struct irq_chip_generic *gc;
 228         struct irq_chip_type *ct;
 229
 230         gc = irq_alloc_generic_chip("INTC", 1, irq_start, base,
 231                         handle_level_irq);
 232         ct = gc->chip_types;
 233         ct->chip.irq_ack = omap_mask_ack_irq;
 234         ct->chip.irq_mask = irq_gc_mask_disable_reg;
 235         ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
 236         ct->chip.flags |= IRQCHIP_SKIP_SET_WAKE;
 237
 238         ct->regs.enable = INTC_MIR_CLEAR0;
 239         ct->regs.disable = INTC_MIR_SET0;
 240         irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
 241                         IRQ_NOREQUEST | IRQ_NOPROBE, 0);
 242 }
 243
 244 static int __init omap_init_irq_of(struct device_node *node)
 245 {
 246         int ret;
 247
 248         omap_irq_base = of_iomap(node, 0);
 249         if (WARN_ON(!omap_irq_base))
 250                 return -ENOMEM;
 251
 252         domain = irq_domain_add_linear(node, omap_nr_irqs,
 253                         &irq_generic_chip_ops, NULL);
 254
 255         omap_irq_soft_reset();
 256
 257         ret = omap_alloc_gc_of(domain, omap_irq_base);
 258         if (ret < 0)
 259                 irq_domain_remove(domain);
 260
 261         return ret;
 262 }
 263
 264 static int __init omap_init_irq_legacy(u32 base, struct device_node *node)
 265 {
 266         int j, irq_base;
 267
 268         omap_irq_base = ioremap(base, SZ_4K);
 269         if (WARN_ON(!omap_irq_base))
 270                 return -ENOMEM;
 271
 272         irq_base = irq_alloc_descs(-1, 0, omap_nr_irqs, 0);
 273         if (irq_base < 0) {
 274                 pr_warn("Couldn't allocate IRQ numbers\n");
 275                 irq_base = 0;
 276         }
 277
 278         domain = irq_domain_add_legacy(node, omap_nr_irqs, irq_base, 0,
 279                         &irq_domain_simple_ops, NULL);
 280
 281         omap_irq_soft_reset();
 282
 283         for (j = 0; j < omap_nr_irqs; j += 32)
 284                 omap_alloc_gc_legacy(omap_irq_base + j, j + irq_base, 32);
 285
 286         return 0;
 287 }
 288
 289 static void __init omap_irq_enable_protection(void)
 290 {
 291         u32 reg;
 292
 293         reg = intc_readl(INTC_PROTECTION);
 294         reg |= INTC_PROTECTION_ENABLE;
 295         intc_writel(INTC_PROTECTION, reg);
 296 }
 297
 298 static int __init omap_init_irq(u32 base, struct device_node *node)
 299 {
 300         int ret;
 301
 302         /*
 303          * FIXME legacy OMAP DMA driver sitting under arch/arm/plat-omap/dma.c
 304          * depends is still not ready for linear IRQ domains; because of that
 305          * we need to temporarily "blacklist" OMAP2 and OMAP3 devices from using
 306          * linear IRQ Domain until that driver is finally fixed.
 307          */
 308         if (of_device_is_compatible(node, "ti,omap2-intc") ||
 309                         of_device_is_compatible(node, "ti,omap3-intc")) {
 310                 struct resource res;
 311
 312                 if (of_address_to_resource(node, 0, &res))
 313                         return -ENOMEM;
 314
 315                 base = res.start;
 316                 ret = omap_init_irq_legacy(base, node);
 317         } else if (node) {
 318                 ret = omap_init_irq_of(node);
 319         } else {
 320                 ret = omap_init_irq_legacy(base, NULL);
 321         }
 322
 323         if (ret == 0)
 324                 omap_irq_enable_protection();
 325
 326         return ret;
 327 }
 328
 329 static asmlinkage void __exception_irq_entry
 330 omap_intc_handle_irq(struct pt_regs *regs)
 331 {
 332         u32 irqnr;
 333
 334         irqnr = intc_readl(INTC_SIR);
 335         irqnr &= ACTIVEIRQ_MASK;
 336         WARN_ONCE(!irqnr, "Spurious IRQ ?\n");
 337         handle_domain_irq(domain, irqnr, regs);
 338 }
 339
 340 void __init omap3_init_irq(void)
 341 {
 342         omap_nr_irqs = 96;
 343         omap_nr_pending = 3;
 344         omap_init_irq(OMAP34XX_IC_BASE, NULL);
 345         set_handle_irq(omap_intc_handle_irq);
 346 }
 347
 348 static int __init intc_of_init(struct device_node *node,
 349                              struct device_node *parent)
 350 {
 351         int ret;
 352
 353         omap_nr_pending = 3;
 354         omap_nr_irqs = 96;
 355
 356         if (WARN_ON(!node))
 357                 return -ENODEV;
 358
 359         if (of_device_is_compatible(node, "ti,dm814-intc") ||
 360             of_device_is_compatible(node, "ti,dm816-intc") ||
 361             of_device_is_compatible(node, "ti,am33xx-intc")) {
 362                 omap_nr_irqs = 128;
 363                 omap_nr_pending = 4;
 364         }
 365
 366         ret = omap_init_irq(-1, of_node_get(node));
 367         if (ret < 0)
 368                 return ret;
 369
 370         set_handle_irq(omap_intc_handle_irq);
 371
 372         return 0;
 373 }
 374
 375 IRQCHIP_DECLARE(omap2_intc, "ti,omap2-intc", intc_of_init);
 376 IRQCHIP_DECLARE(omap3_intc, "ti,omap3-intc", intc_of_init);
 377 IRQCHIP_DECLARE(dm814x_intc, "ti,dm814-intc", intc_of_init);
 378 IRQCHIP_DECLARE(dm816x_intc, "ti,dm816-intc", intc_of_init);
 379 IRQCHIP_DECLARE(am33xx_intc, "ti,am33xx-intc", intc_of_init);