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 void aic5_suspend(struct irq_data *d)
 154 {
 155         struct irq_domain *domain = d->domain;
 156         struct irq_domain_chip_generic *dgc = domain->gc;
 157         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 158         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 159         int i;
 160         u32 mask;
 161
 162         irq_gc_lock(bgc);
 163         for (i = 0; i < dgc->irqs_per_chip; i++) {
 164                 mask = 1 << i;
 165                 if ((mask & gc->mask_cache) == (mask & gc->wake_active))
 166                         continue;
 167
 168                 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 169                 if (mask & gc->wake_active)
 170                         irq_reg_writel(bgc, 1, AT91_AIC5_IECR);
 171                 else
 172                         irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 173         }
 174         irq_gc_unlock(bgc);
 175 }
 176
 177 static void aic5_resume(struct irq_data *d)
 178 {
 179         struct irq_domain *domain = d->domain;
 180         struct irq_domain_chip_generic *dgc = domain->gc;
 181         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 182         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 183         int i;
 184         u32 mask;
 185
 186         irq_gc_lock(bgc);
 187         for (i = 0; i < dgc->irqs_per_chip; i++) {
 188                 mask = 1 << i;
 189                 if ((mask & gc->mask_cache) == (mask & gc->wake_active))
 190                         continue;
 191
 192                 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 193                 if (mask & gc->mask_cache)
 194                         irq_reg_writel(bgc, 1, AT91_AIC5_IECR);
 195                 else
 196                         irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 197         }
 198         irq_gc_unlock(bgc);
 199 }
 200
 201 static void aic5_pm_shutdown(struct irq_data *d)
 202 {
 203         struct irq_domain *domain = d->domain;
 204         struct irq_domain_chip_generic *dgc = domain->gc;
 205         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 206         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 207         int i;
 208
 209         irq_gc_lock(bgc);
 210         for (i = 0; i < dgc->irqs_per_chip; i++) {
 211                 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 212                 irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 213                 irq_reg_writel(bgc, 1, AT91_AIC5_ICCR);
 214         }
 215         irq_gc_unlock(bgc);
 216 }
 217 #else
 218 #define aic5_suspend            NULL
 219 #define aic5_resume             NULL
 220 #define aic5_pm_shutdown        NULL
 221 #endif /* CONFIG_PM */
 222
 223 static void __init aic5_hw_init(struct irq_domain *domain)
 224 {
 225         struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0);
 226         int i;
 227
 228         /*
 229          * Perform 8 End Of Interrupt Command to make sure AIC
 230          * will not Lock out nIRQ
 231          */
 232         for (i = 0; i < 8; i++)
 233                 irq_reg_writel(gc, 0, AT91_AIC5_EOICR);
 234
 235         /*
 236          * Spurious Interrupt ID in Spurious Vector Register.
 237          * When there is no current interrupt, the IRQ Vector Register
 238          * reads the value stored in AIC_SPU
 239          */
 240         irq_reg_writel(gc, 0xffffffff, AT91_AIC5_SPU);
 241
 242         /* No debugging in AIC: Debug (Protect) Control Register */
 243         irq_reg_writel(gc, 0, AT91_AIC5_DCR);
 244
 245         /* Disable and clear all interrupts initially */
 246         for (i = 0; i < domain->revmap_size; i++) {
 247                 irq_reg_writel(gc, i, AT91_AIC5_SSR);
 248                 irq_reg_writel(gc, i, AT91_AIC5_SVR);
 249                 irq_reg_writel(gc, 1, AT91_AIC5_IDCR);
 250                 irq_reg_writel(gc, 1, AT91_AIC5_ICCR);
 251         }
 252 }
 253
 254 static int aic5_irq_domain_xlate(struct irq_domain *d,
 255                                  struct device_node *ctrlr,
 256                                  const u32 *intspec, unsigned int intsize,
 257                                  irq_hw_number_t *out_hwirq,
 258                                  unsigned int *out_type)
 259 {
 260         struct irq_chip_generic *bgc = irq_get_domain_generic_chip(d, 0);
 261         unsigned long flags;
 262         unsigned smr;
 263         int ret;
 264
 265         if (!bgc)
 266                 return -EINVAL;
 267
 268         ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize,
 269                                           out_hwirq, out_type);
 270         if (ret)
 271                 return ret;
 272
 273         irq_gc_lock_irqsave(bgc, flags);
 274         irq_reg_writel(bgc, *out_hwirq, AT91_AIC5_SSR);
 275         smr = irq_reg_readl(bgc, AT91_AIC5_SMR);
 276         aic_common_set_priority(intspec[2], &smr);
 277         irq_reg_writel(bgc, smr, AT91_AIC5_SMR);
 278         irq_gc_unlock_irqrestore(bgc, flags);
 279
 280         return ret;
 281 }
 282
 283 static const struct irq_domain_ops aic5_irq_ops = {
 284         .map    = irq_map_generic_chip,
 285         .xlate  = aic5_irq_domain_xlate,
 286 };
 287
 288 static void __init sama5d3_aic_irq_fixup(struct device_node *root)
 289 {
 290         aic_common_rtc_irq_fixup(root);
 291 }
 292
 293 static const struct of_device_id aic5_irq_fixups[] __initconst = {
 294         { .compatible = "atmel,sama5d3", .data = sama5d3_aic_irq_fixup },
 295         { .compatible = "atmel,sama5d4", .data = sama5d3_aic_irq_fixup },
 296         { /* sentinel */ },
 297 };
 298
 299 static int __init aic5_of_init(struct device_node *node,
 300                                struct device_node *parent,
 301                                int nirqs)
 302 {
 303         struct irq_chip_generic *gc;
 304         struct irq_domain *domain;
 305         int nchips;
 306         int i;
 307
 308         if (nirqs > NR_AIC5_IRQS)
 309                 return -EINVAL;
 310
 311         if (aic5_domain)
 312                 return -EEXIST;
 313
 314         domain = aic_common_of_init(node, &aic5_irq_ops, "atmel-aic5",
 315                                     nirqs, aic5_irq_fixups);
 316         if (IS_ERR(domain))
 317                 return PTR_ERR(domain);
 318
 319         aic5_domain = domain;
 320         nchips = aic5_domain->revmap_size / 32;
 321         for (i = 0; i < nchips; i++) {
 322                 gc = irq_get_domain_generic_chip(domain, i * 32);
 323
 324                 gc->chip_types[0].regs.eoi = AT91_AIC5_EOICR;
 325                 gc->chip_types[0].chip.irq_mask = aic5_mask;
 326                 gc->chip_types[0].chip.irq_unmask = aic5_unmask;
 327                 gc->chip_types[0].chip.irq_retrigger = aic5_retrigger;
 328                 gc->chip_types[0].chip.irq_set_type = aic5_set_type;
 329                 gc->chip_types[0].chip.irq_suspend = aic5_suspend;
 330                 gc->chip_types[0].chip.irq_resume = aic5_resume;
 331                 gc->chip_types[0].chip.irq_pm_shutdown = aic5_pm_shutdown;
 332         }
 333
 334         aic5_hw_init(domain);
 335         set_handle_irq(aic5_handle);
 336
 337         return 0;
 338 }
 339
 340 #define NR_SAMA5D2_IRQS         77
 341
 342 static int __init sama5d2_aic5_of_init(struct device_node *node,
 343                                        struct device_node *parent)
 344 {
 345         return aic5_of_init(node, parent, NR_SAMA5D2_IRQS);
 346 }
 347 IRQCHIP_DECLARE(sama5d2_aic5, "atmel,sama5d2-aic", sama5d2_aic5_of_init);
 348
 349 #define NR_SAMA5D3_IRQS         48
 350
 351 static int __init sama5d3_aic5_of_init(struct device_node *node,
 352                                        struct device_node *parent)
 353 {
 354         return aic5_of_init(node, parent, NR_SAMA5D3_IRQS);
 355 }
 356 IRQCHIP_DECLARE(sama5d3_aic5, "atmel,sama5d3-aic", sama5d3_aic5_of_init);
 357
 358 #define NR_SAMA5D4_IRQS         68
 359
 360 static int __init sama5d4_aic5_of_init(struct device_node *node,
 361                                        struct device_node *parent)
 362 {
 363         return aic5_of_init(node, parent, NR_SAMA5D4_IRQS);
 364 }
 365 IRQCHIP_DECLARE(sama5d4_aic5, "atmel,sama5d4-aic", sama5d4_aic5_of_init);