drivers/irqchip/irq-atmel-aic5.c

   1 /*
   2  * Atmel AT91 AIC5 (Advanced Interrupt Controller) driver
   3  *
   4  *  Copyright (C) 2004 SAN People
   5  *  Copyright (C) 2004 ATMEL
   6  *  Copyright (C) Rick Bronson
   7  *  Copyright (C) 2014 Free Electrons
   8  *
   9  *  Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
  10  *
  11  * This file is licensed under the terms of the GNU General Public
  12  * License version 2.  This program is licensed "as is" without any
  13  * warranty of any kind, whether express or implied.
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/mm.h>
  19 #include <linux/bitmap.h>
  20 #include <linux/types.h>
  21 #include <linux/irq.h>
  22 #include <linux/irqchip.h>
  23 #include <linux/of.h>
  24 #include <linux/of_address.h>
  25 #include <linux/of_irq.h>
  26 #include <linux/irqdomain.h>
  27 #include <linux/err.h>
  28 #include <linux/slab.h>
  29 #include <linux/io.h>
  30
  31 #include <asm/exception.h>
  32 #include <asm/mach/irq.h>
  33
  34 #include "irq-atmel-aic-common.h"
  35
  36 /* Number of irq lines managed by AIC */
  37 #define NR_AIC5_IRQS    128
  38
  39 #define AT91_AIC5_SSR           0x0
  40 #define AT91_AIC5_INTSEL_MSK    (0x7f << 0)
  41
  42 #define AT91_AIC5_SMR                   0x4
  43
  44 #define AT91_AIC5_SVR                   0x8
  45 #define AT91_AIC5_IVR                   0x10
  46 #define AT91_AIC5_FVR                   0x14
  47 #define AT91_AIC5_ISR                   0x18
  48
  49 #define AT91_AIC5_IPR0                  0x20
  50 #define AT91_AIC5_IPR1                  0x24
  51 #define AT91_AIC5_IPR2                  0x28
  52 #define AT91_AIC5_IPR3                  0x2c
  53 #define AT91_AIC5_IMR                   0x30
  54 #define AT91_AIC5_CISR                  0x34
  55
  56 #define AT91_AIC5_IECR                  0x40
  57 #define AT91_AIC5_IDCR                  0x44
  58 #define AT91_AIC5_ICCR                  0x48
  59 #define AT91_AIC5_ISCR                  0x4c
  60 #define AT91_AIC5_EOICR                 0x38
  61 #define AT91_AIC5_SPU                   0x3c
  62 #define AT91_AIC5_DCR                   0x6c
  63
  64 #define AT91_AIC5_FFER                  0x50
  65 #define AT91_AIC5_FFDR                  0x54
  66 #define AT91_AIC5_FFSR                  0x58
  67
  68 static struct irq_domain *aic5_domain;
  69
  70 static asmlinkage void __exception_irq_entry
  71 aic5_handle(struct pt_regs *regs)
  72 {
  73         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(aic5_domain, 0);
  74         u32 irqnr;
  75         u32 irqstat;
  76
  77         irqnr = irq_reg_readl(bgc, AT91_AIC5_IVR);
  78         irqstat = irq_reg_readl(bgc, AT91_AIC5_ISR);
  79
  80         if (!irqstat)
  81                 irq_reg_writel(bgc, 0, AT91_AIC5_EOICR);
  82         else
  83                 handle_domain_irq(aic5_domain, irqnr, regs);
  84 }
  85
  86 static void aic5_mask(struct irq_data *d)
  87 {
  88         struct irq_domain *domain = d->domain;
  89         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
  90         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
  91
  92         /*
  93          * Disable interrupt on AIC5. We always take the lock of the
  94          * first irq chip as all chips share the same registers.
  95          */
  96         irq_gc_lock(bgc);
  97         irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR);
  98         irq_reg_writel(gc, 1, AT91_AIC5_IDCR);
  99         gc->mask_cache &= ~d->mask;
 100         irq_gc_unlock(bgc);
 101 }
 102
 103 static void aic5_unmask(struct irq_data *d)
 104 {
 105         struct irq_domain *domain = d->domain;
 106         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 107         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 108
 109         /*
 110          * Enable interrupt on AIC5. We always take the lock of the
 111          * first irq chip as all chips share the same registers.
 112          */
 113         irq_gc_lock(bgc);
 114         irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR);
 115         irq_reg_writel(gc, 1, AT91_AIC5_IECR);
 116         gc->mask_cache |= d->mask;
 117         irq_gc_unlock(bgc);
 118 }
 119
 120 static int aic5_retrigger(struct irq_data *d)
 121 {
 122         struct irq_domain *domain = d->domain;
 123         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 124
 125         /* Enable interrupt on AIC5 */
 126         irq_gc_lock(bgc);
 127         irq_reg_writel(bgc, d->hwirq, AT91_AIC5_SSR);
 128         irq_reg_writel(bgc, 1, AT91_AIC5_ISCR);
 129         irq_gc_unlock(bgc);
 130
 131         return 0;
 132 }
 133
 134 static int aic5_set_type(struct irq_data *d, unsigned type)
 135 {
 136         struct irq_domain *domain = d->domain;
 137         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 138         unsigned int smr;
 139         int ret;
 140
 141         irq_gc_lock(bgc);
 142         irq_reg_writel(bgc, d->hwirq, AT91_AIC5_SSR);
 143         smr = irq_reg_readl(bgc, AT91_AIC5_SMR);
 144         ret = aic_common_set_type(d, type, &smr);
 145         if (!ret)
 146                 irq_reg_writel(bgc, smr, AT91_AIC5_SMR);
 147         irq_gc_unlock(bgc);
 148
 149         return ret;
 150 }
 151
 152 #ifdef CONFIG_PM
 153 static u32 *smr_cache;
 154
 155 static void aic5_suspend(struct irq_data *d)
 156 {
 157         struct irq_domain *domain = d->domain;
 158         struct irq_domain_chip_generic *dgc = domain->gc;
 159         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 160         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 161         int i;
 162         u32 mask;
 163
 164         if (smr_cache)
 165                 for (i = 0; i < domain->revmap_size; i++) {
 166                         irq_reg_writel(bgc, i, AT91_AIC5_SSR);
 167                         smr_cache[i] = irq_reg_readl(bgc, AT91_AIC5_SMR);
 168                 }
 169
 170         irq_gc_lock(bgc);
 171         for (i = 0; i < dgc->irqs_per_chip; i++) {
 172                 mask = 1 << i;
 173                 if ((mask & gc->mask_cache) == (mask & gc->wake_active))
 174                         continue;
 175
 176                 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 177                 if (mask & gc->wake_active)
 178                         irq_reg_writel(bgc, 1, AT91_AIC5_IECR);
 179                 else
 180                         irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 181         }
 182         irq_gc_unlock(bgc);
 183 }
 184
 185 static void aic5_resume(struct irq_data *d)
 186 {
 187         struct irq_domain *domain = d->domain;
 188         struct irq_domain_chip_generic *dgc = domain->gc;
 189         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 190         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 191         int i;
 192         u32 mask;
 193
 194         irq_gc_lock(bgc);
 195
 196         if (smr_cache) {
 197                 irq_reg_writel(bgc, 0xffffffff, AT91_AIC5_SPU);
 198                 for (i = 0; i < domain->revmap_size; i++) {
 199                         irq_reg_writel(bgc, i, AT91_AIC5_SSR);
 200                         irq_reg_writel(bgc, i, AT91_AIC5_SVR);
 201                         irq_reg_writel(bgc, smr_cache[i], AT91_AIC5_SMR);
 202                 }
 203         }
 204
 205         for (i = 0; i < dgc->irqs_per_chip; i++) {
 206                 mask = 1 << i;
 207
 208                 if (!smr_cache &&
 209                     ((mask & gc->mask_cache) == (mask & gc->wake_active)))
 210                         continue;
 211
 212                 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 213                 if (mask & gc->mask_cache)
 214                         irq_reg_writel(bgc, 1, AT91_AIC5_IECR);
 215                 else
 216                         irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 217         }
 218         irq_gc_unlock(bgc);
 219 }
 220
 221 static void aic5_pm_shutdown(struct irq_data *d)
 222 {
 223         struct irq_domain *domain = d->domain;
 224         struct irq_domain_chip_generic *dgc = domain->gc;
 225         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 226         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 227         int i;
 228
 229         irq_gc_lock(bgc);
 230         for (i = 0; i < dgc->irqs_per_chip; i++) {
 231                 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 232                 irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 233                 irq_reg_writel(bgc, 1, AT91_AIC5_ICCR);
 234         }
 235         irq_gc_unlock(bgc);
 236 }
 237 #else
 238 #define aic5_suspend            NULL
 239 #define aic5_resume             NULL
 240 #define aic5_pm_shutdown        NULL
 241 #endif /* CONFIG_PM */
 242
 243 static void __init aic5_hw_init(struct irq_domain *domain)
 244 {
 245         struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0);
 246         int i;
 247
 248         /*
 249          * Perform 8 End Of Interrupt Command to make sure AIC
 250          * will not Lock out nIRQ
 251          */
 252         for (i = 0; i < 8; i++)
 253                 irq_reg_writel(gc, 0, AT91_AIC5_EOICR);
 254
 255         /*
 256          * Spurious Interrupt ID in Spurious Vector Register.
 257          * When there is no current interrupt, the IRQ Vector Register
 258          * reads the value stored in AIC_SPU
 259          */
 260         irq_reg_writel(gc, 0xffffffff, AT91_AIC5_SPU);
 261
 262         /* No debugging in AIC: Debug (Protect) Control Register */
 263         irq_reg_writel(gc, 0, AT91_AIC5_DCR);
 264
 265         /* Disable and clear all interrupts initially */
 266         for (i = 0; i < domain->revmap_size; i++) {
 267                 irq_reg_writel(gc, i, AT91_AIC5_SSR);
 268                 irq_reg_writel(gc, i, AT91_AIC5_SVR);
 269                 irq_reg_writel(gc, 1, AT91_AIC5_IDCR);
 270                 irq_reg_writel(gc, 1, AT91_AIC5_ICCR);
 271         }
 272 }
 273
 274 static int aic5_irq_domain_xlate(struct irq_domain *d,
 275                                  struct device_node *ctrlr,
 276                                  const u32 *intspec, unsigned int intsize,
 277                                  irq_hw_number_t *out_hwirq,
 278                                  unsigned int *out_type)
 279 {
 280         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(d, 0);
 281         unsigned long flags;
 282         unsigned smr;
 283         int ret;
 284
 285         if (!bgc)
 286                 return -EINVAL;
 287
 288         ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize,
 289                                           out_hwirq, out_type);
 290         if (ret)
 291                 return ret;
 292
 293         irq_gc_lock_irqsave(bgc, flags);
 294         irq_reg_writel(bgc, *out_hwirq, AT91_AIC5_SSR);
 295         smr = irq_reg_readl(bgc, AT91_AIC5_SMR);
 296         aic_common_set_priority(intspec[2], &smr);
 297         irq_reg_writel(bgc, smr, AT91_AIC5_SMR);
 298         irq_gc_unlock_irqrestore(bgc, flags);
 299
 300         return ret;
 301 }
 302
 303 static const struct irq_domain_ops aic5_irq_ops = {
 304         .map    = irq_map_generic_chip,
 305         .xlate  = aic5_irq_domain_xlate,
 306 };
 307
 308 static void __init sama5d3_aic_irq_fixup(void)
 309 {
 310         aic_common_rtc_irq_fixup();
 311 }
 312
 313 static const struct of_device_id aic5_irq_fixups[] __initconst = {
 314         { .compatible = "atmel,sama5d3", .data = sama5d3_aic_irq_fixup },
 315         { .compatible = "atmel,sama5d4", .data = sama5d3_aic_irq_fixup },
 316         { /* sentinel */ },
 317 };
 318
 319 static int __init aic5_of_init(struct device_node *node,
 320                                struct device_node *parent,
 321                                int nirqs)
 322 {
 323         struct irq_chip_generic *gc;
 324         struct irq_domain *domain;
 325         int nchips;
 326         int i;
 327
 328         if (nirqs > NR_AIC5_IRQS)
 329                 return -EINVAL;
 330
 331         if (aic5_domain)
 332                 return -EEXIST;
 333
 334         domain = aic_common_of_init(node, &aic5_irq_ops, "atmel-aic5",
 335                                     nirqs, aic5_irq_fixups);
 336         if (IS_ERR(domain))
 337                 return PTR_ERR(domain);
 338
 339         aic5_domain = domain;
 340         nchips = aic5_domain->revmap_size / 32;
 341         for (i = 0; i < nchips; i++) {
 342                 gc = irq_get_domain_generic_chip(domain, i * 32);
 343
 344                 gc->chip_types[0].regs.eoi = AT91_AIC5_EOICR;
 345                 gc->chip_types[0].chip.irq_mask = aic5_mask;
 346                 gc->chip_types[0].chip.irq_unmask = aic5_unmask;
 347                 gc->chip_types[0].chip.irq_retrigger = aic5_retrigger;
 348                 gc->chip_types[0].chip.irq_set_type = aic5_set_type;
 349                 gc->chip_types[0].chip.irq_suspend = aic5_suspend;
 350                 gc->chip_types[0].chip.irq_resume = aic5_resume;
 351                 gc->chip_types[0].chip.irq_pm_shutdown = aic5_pm_shutdown;
 352         }
 353
 354         aic5_hw_init(domain);
 355         set_handle_irq(aic5_handle);
 356
 357         return 0;
 358 }
 359
 360 #define NR_SAMA5D2_IRQS         77
 361
 362 static int __init sama5d2_aic5_of_init(struct device_node *node,
 363                                        struct device_node *parent)
 364 {
 365 #ifdef CONFIG_PM
 366         smr_cache = kcalloc(DIV_ROUND_UP(NR_SAMA5D2_IRQS, 32) * 32,
 367                             sizeof(*smr_cache), GFP_KERNEL);
 368         if (!smr_cache)
 369                 return -ENOMEM;
 370 #endif
 371
 372         return aic5_of_init(node, parent, NR_SAMA5D2_IRQS);
 373 }
 374 IRQCHIP_DECLARE(sama5d2_aic5, "atmel,sama5d2-aic", sama5d2_aic5_of_init);
 375
 376 #define NR_SAMA5D3_IRQS         48
 377
 378 static int __init sama5d3_aic5_of_init(struct device_node *node,
 379                                        struct device_node *parent)
 380 {
 381         return aic5_of_init(node, parent, NR_SAMA5D3_IRQS);
 382 }
 383 IRQCHIP_DECLARE(sama5d3_aic5, "atmel,sama5d3-aic", sama5d3_aic5_of_init);
 384
 385 #define NR_SAMA5D4_IRQS         68
 386
 387 static int __init sama5d4_aic5_of_init(struct device_node *node,
 388                                        struct device_node *parent)
 389 {
 390         return aic5_of_init(node, parent, NR_SAMA5D4_IRQS);
 391 }
 392 IRQCHIP_DECLARE(sama5d4_aic5, "atmel,sama5d4-aic", sama5d4_aic5_of_init);