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/of.h>
  23 #include <linux/of_address.h>
  24 #include <linux/of_irq.h>
  25 #include <linux/irqdomain.h>
  26 #include <linux/err.h>
  27 #include <linux/slab.h>
  28 #include <linux/io.h>
  29
  30 #include <asm/exception.h>
  31 #include <asm/mach/irq.h>
  32
  33 #include "irq-atmel-aic-common.h"
  34 #include "irqchip.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_domain_chip_generic *dgc = aic5_domain->gc;
  74         struct irq_chip_generic *gc = dgc->gc[0];
  75         u32 irqnr;
  76         u32 irqstat;
  77
  78         irqnr = irq_reg_readl(gc, AT91_AIC5_IVR);
  79         irqstat = irq_reg_readl(gc, AT91_AIC5_ISR);
  80
  81         if (!irqstat)
  82                 irq_reg_writel(gc, 0, AT91_AIC5_EOICR);
  83         else
  84                 handle_domain_irq(aic5_domain, irqnr, regs);
  85 }
  86
  87 static void aic5_mask(struct irq_data *d)
  88 {
  89         struct irq_domain *domain = d->domain;
  90         struct irq_domain_chip_generic *dgc = domain->gc;
  91         struct irq_chip_generic *gc = dgc->gc[0];
  92
  93         /* Disable interrupt on AIC5 */
  94         irq_gc_lock(gc);
  95         irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR);
  96         irq_reg_writel(gc, 1, AT91_AIC5_IDCR);
  97         gc->mask_cache &= ~d->mask;
  98         irq_gc_unlock(gc);
  99 }
 100
 101 static void aic5_unmask(struct irq_data *d)
 102 {
 103         struct irq_domain *domain = d->domain;
 104         struct irq_domain_chip_generic *dgc = domain->gc;
 105         struct irq_chip_generic *gc = dgc->gc[0];
 106
 107         /* Enable interrupt on AIC5 */
 108         irq_gc_lock(gc);
 109         irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR);
 110         irq_reg_writel(gc, 1, AT91_AIC5_IECR);
 111         gc->mask_cache |= d->mask;
 112         irq_gc_unlock(gc);
 113 }
 114
 115 static int aic5_retrigger(struct irq_data *d)
 116 {
 117         struct irq_domain *domain = d->domain;
 118         struct irq_domain_chip_generic *dgc = domain->gc;
 119         struct irq_chip_generic *gc = dgc->gc[0];
 120
 121         /* Enable interrupt on AIC5 */
 122         irq_gc_lock(gc);
 123         irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR);
 124         irq_reg_writel(gc, 1, AT91_AIC5_ISCR);
 125         irq_gc_unlock(gc);
 126
 127         return 0;
 128 }
 129
 130 static int aic5_set_type(struct irq_data *d, unsigned type)
 131 {
 132         struct irq_domain *domain = d->domain;
 133         struct irq_domain_chip_generic *dgc = domain->gc;
 134         struct irq_chip_generic *gc = dgc->gc[0];
 135         unsigned int smr;
 136         int ret;
 137
 138         irq_gc_lock(gc);
 139         irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR);
 140         smr = irq_reg_readl(gc, AT91_AIC5_SMR);
 141         ret = aic_common_set_type(d, type, &smr);
 142         if (!ret)
 143                 irq_reg_writel(gc, smr, AT91_AIC5_SMR);
 144         irq_gc_unlock(gc);
 145
 146         return ret;
 147 }
 148
 149 #ifdef CONFIG_PM
 150 static void aic5_suspend(struct irq_data *d)
 151 {
 152         struct irq_domain *domain = d->domain;
 153         struct irq_domain_chip_generic *dgc = domain->gc;
 154         struct irq_chip_generic *bgc = dgc->gc[0];
 155         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 156         int i;
 157         u32 mask;
 158
 159         irq_gc_lock(bgc);
 160         for (i = 0; i < dgc->irqs_per_chip; i++) {
 161                 mask = 1 << i;
 162                 if ((mask & gc->mask_cache) == (mask & gc->wake_active))
 163                         continue;
 164
 165                 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 166                 if (mask & gc->wake_active)
 167                         irq_reg_writel(bgc, 1, AT91_AIC5_IECR);
 168                 else
 169                         irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 170         }
 171         irq_gc_unlock(bgc);
 172 }
 173
 174 static void aic5_resume(struct irq_data *d)
 175 {
 176         struct irq_domain *domain = d->domain;
 177         struct irq_domain_chip_generic *dgc = domain->gc;
 178         struct irq_chip_generic *bgc = dgc->gc[0];
 179         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 180         int i;
 181         u32 mask;
 182
 183         irq_gc_lock(bgc);
 184         for (i = 0; i < dgc->irqs_per_chip; i++) {
 185                 mask = 1 << i;
 186                 if ((mask & gc->mask_cache) == (mask & gc->wake_active))
 187                         continue;
 188
 189                 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 190                 if (mask & gc->mask_cache)
 191                         irq_reg_writel(bgc, 1, AT91_AIC5_IECR);
 192                 else
 193                         irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 194         }
 195         irq_gc_unlock(bgc);
 196 }
 197
 198 static void aic5_pm_shutdown(struct irq_data *d)
 199 {
 200         struct irq_domain *domain = d->domain;
 201         struct irq_domain_chip_generic *dgc = domain->gc;
 202         struct irq_chip_generic *bgc = dgc->gc[0];
 203         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 204         int i;
 205
 206         irq_gc_lock(bgc);
 207         for (i = 0; i < dgc->irqs_per_chip; i++) {
 208                 irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 209                 irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 210                 irq_reg_writel(bgc, 1, AT91_AIC5_ICCR);
 211         }
 212         irq_gc_unlock(bgc);
 213 }
 214 #else
 215 #define aic5_suspend            NULL
 216 #define aic5_resume             NULL
 217 #define aic5_pm_shutdown        NULL
 218 #endif /* CONFIG_PM */
 219
 220 static void __init aic5_hw_init(struct irq_domain *domain)
 221 {
 222         struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0);
 223         int i;
 224
 225         /*
 226          * Perform 8 End Of Interrupt Command to make sure AIC
 227          * will not Lock out nIRQ
 228          */
 229         for (i = 0; i < 8; i++)
 230                 irq_reg_writel(gc, 0, AT91_AIC5_EOICR);
 231
 232         /*
 233          * Spurious Interrupt ID in Spurious Vector Register.
 234          * When there is no current interrupt, the IRQ Vector Register
 235          * reads the value stored in AIC_SPU
 236          */
 237         irq_reg_writel(gc, 0xffffffff, AT91_AIC5_SPU);
 238
 239         /* No debugging in AIC: Debug (Protect) Control Register */
 240         irq_reg_writel(gc, 0, AT91_AIC5_DCR);
 241
 242         /* Disable and clear all interrupts initially */
 243         for (i = 0; i < domain->revmap_size; i++) {
 244                 irq_reg_writel(gc, i, AT91_AIC5_SSR);
 245                 irq_reg_writel(gc, i, AT91_AIC5_SVR);
 246                 irq_reg_writel(gc, 1, AT91_AIC5_IDCR);
 247                 irq_reg_writel(gc, 1, AT91_AIC5_ICCR);
 248         }
 249 }
 250
 251 static int aic5_irq_domain_xlate(struct irq_domain *d,
 252                                  struct device_node *ctrlr,
 253                                  const u32 *intspec, unsigned int intsize,
 254                                  irq_hw_number_t *out_hwirq,
 255                                  unsigned int *out_type)
 256 {
 257         struct irq_domain_chip_generic *dgc = d->gc;
 258         struct irq_chip_generic *gc;
 259         unsigned smr;
 260         int ret;
 261
 262         if (!dgc)
 263                 return -EINVAL;
 264
 265         ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize,
 266                                           out_hwirq, out_type);
 267         if (ret)
 268                 return ret;
 269
 270         gc = dgc->gc[0];
 271
 272         irq_gc_lock(gc);
 273         irq_reg_writel(gc, *out_hwirq, AT91_AIC5_SSR);
 274         smr = irq_reg_readl(gc, AT91_AIC5_SMR);
 275         ret = aic_common_set_priority(intspec[2], &smr);
 276         if (!ret)
 277                 irq_reg_writel(gc, intspec[2] | smr, AT91_AIC5_SMR);
 278         irq_gc_unlock(gc);
 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 __initdata aic5_irq_fixups[] = {
 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);
 316         if (IS_ERR(domain))
 317                 return PTR_ERR(domain);
 318
 319         aic_common_irq_fixup(aic5_irq_fixups);
 320
 321         aic5_domain = domain;
 322         nchips = aic5_domain->revmap_size / 32;
 323         for (i = 0; i < nchips; i++) {
 324                 gc = irq_get_domain_generic_chip(domain, i * 32);
 325
 326                 gc->chip_types[0].regs.eoi = AT91_AIC5_EOICR;
 327                 gc->chip_types[0].chip.irq_mask = aic5_mask;
 328                 gc->chip_types[0].chip.irq_unmask = aic5_unmask;
 329                 gc->chip_types[0].chip.irq_retrigger = aic5_retrigger;
 330                 gc->chip_types[0].chip.irq_set_type = aic5_set_type;
 331                 gc->chip_types[0].chip.irq_suspend = aic5_suspend;
 332                 gc->chip_types[0].chip.irq_resume = aic5_resume;
 333                 gc->chip_types[0].chip.irq_pm_shutdown = aic5_pm_shutdown;
 334         }
 335
 336         aic5_hw_init(domain);
 337         set_handle_irq(aic5_handle);
 338
 339         return 0;
 340 }
 341
 342 #define NR_SAMA5D3_IRQS         48
 343
 344 static int __init sama5d3_aic5_of_init(struct device_node *node,
 345                                        struct device_node *parent)
 346 {
 347         return aic5_of_init(node, parent, NR_SAMA5D3_IRQS);
 348 }
 349 IRQCHIP_DECLARE(sama5d3_aic5, "atmel,sama5d3-aic", sama5d3_aic5_of_init);
 350
 351 #define NR_SAMA5D4_IRQS         68
 352
 353 static int __init sama5d4_aic5_of_init(struct device_node *node,
 354                                        struct device_node *parent)
 355 {
 356         return aic5_of_init(node, parent, NR_SAMA5D4_IRQS);
 357 }
 358 IRQCHIP_DECLARE(sama5d4_aic5, "atmel,sama5d4-aic", sama5d4_aic5_of_init);