drivers/irqchip/irq-atmel-aic-common.c

   1 /*
   2  * Atmel AT91 common AIC (Advanced Interrupt Controller) code shared by
   3  * irq-atmel-aic and irq-atmel-aic5 drivers
   4  *
   5  *  Copyright (C) 2004 SAN People
   6  *  Copyright (C) 2004 ATMEL
   7  *  Copyright (C) Rick Bronson
   8  *  Copyright (C) 2014 Free Electrons
   9  *
  10  *  Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
  11  *
  12  * This file is licensed under the terms of the GNU General Public
  13  * License version 2.  This program is licensed "as is" without any
  14  * warranty of any kind, whether express or implied.
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/io.h>
  19 #include <linux/irq.h>
  20 #include <linux/irqdomain.h>
  21 #include <linux/of.h>
  22 #include <linux/of_address.h>
  23 #include <linux/slab.h>
  24
  25 #include "irq-atmel-aic-common.h"
  26
  27 #define AT91_AIC_PRIOR                  GENMASK(2, 0)
  28 #define AT91_AIC_IRQ_MIN_PRIORITY       0
  29 #define AT91_AIC_IRQ_MAX_PRIORITY       7
  30
  31 #define AT91_AIC_SRCTYPE                GENMASK(6, 5)
  32 #define AT91_AIC_SRCTYPE_LOW            (0 << 5)
  33 #define AT91_AIC_SRCTYPE_FALLING        (1 << 5)
  34 #define AT91_AIC_SRCTYPE_HIGH           (2 << 5)
  35 #define AT91_AIC_SRCTYPE_RISING         (3 << 5)
  36
  37 struct aic_chip_data {
  38         u32 ext_irqs;
  39 };
  40
  41 static void aic_common_shutdown(struct irq_data *d)
  42 {
  43         struct irq_chip_type *ct = irq_data_get_chip_type(d);
  44
  45         ct->chip.irq_mask(d);
  46 }
  47
  48 int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val)
  49 {
  50         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
  51         struct aic_chip_data *aic = gc->private;
  52         unsigned aic_type;
  53
  54         switch (type) {
  55         case IRQ_TYPE_LEVEL_HIGH:
  56                 aic_type = AT91_AIC_SRCTYPE_HIGH;
  57                 break;
  58         case IRQ_TYPE_EDGE_RISING:
  59                 aic_type = AT91_AIC_SRCTYPE_RISING;
  60                 break;
  61         case IRQ_TYPE_LEVEL_LOW:
  62                 if (!(d->mask & aic->ext_irqs))
  63                         return -EINVAL;
  64
  65                 aic_type = AT91_AIC_SRCTYPE_LOW;
  66                 break;
  67         case IRQ_TYPE_EDGE_FALLING:
  68                 if (!(d->mask & aic->ext_irqs))
  69                         return -EINVAL;
  70
  71                 aic_type = AT91_AIC_SRCTYPE_FALLING;
  72                 break;
  73         default:
  74                 return -EINVAL;
  75         }
  76
  77         *val &= ~AT91_AIC_SRCTYPE;
  78         *val |= aic_type;
  79
  80         return 0;
  81 }
  82
  83 void aic_common_set_priority(int priority, unsigned *val)
  84 {
  85         *val &= ~AT91_AIC_PRIOR;
  86         *val |= priority;
  87 }
  88
  89 int aic_common_irq_domain_xlate(struct irq_domain *d,
  90                                 struct device_node *ctrlr,
  91                                 const u32 *intspec,
  92                                 unsigned int intsize,
  93                                 irq_hw_number_t *out_hwirq,
  94                                 unsigned int *out_type)
  95 {
  96         if (WARN_ON(intsize < 3))
  97                 return -EINVAL;
  98
  99         if (WARN_ON((intspec[2] < AT91_AIC_IRQ_MIN_PRIORITY) ||
 100                     (intspec[2] > AT91_AIC_IRQ_MAX_PRIORITY)))
 101                 return -EINVAL;
 102
 103         *out_hwirq = intspec[0];
 104         *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
 105
 106         return 0;
 107 }
 108
 109 static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
 110 {
 111         struct device_node *node = irq_domain_get_of_node(domain);
 112         struct irq_chip_generic *gc;
 113         struct aic_chip_data *aic;
 114         struct property *prop;
 115         const __be32 *p;
 116         u32 hwirq;
 117
 118         gc = irq_get_domain_generic_chip(domain, 0);
 119
 120         aic = gc->private;
 121         aic->ext_irqs |= 1;
 122
 123         of_property_for_each_u32(node, "atmel,external-irqs", prop, p, hwirq) {
 124                 gc = irq_get_domain_generic_chip(domain, hwirq);
 125                 if (!gc) {
 126                         pr_warn("AIC: external irq %d >= %d skip it\n",
 127                                 hwirq, domain->revmap_size);
 128                         continue;
 129                 }
 130
 131                 aic = gc->private;
 132                 aic->ext_irqs |= (1 << (hwirq % 32));
 133         }
 134 }
 135
 136 #define AT91_RTC_IDR           0x24
 137 #define AT91_RTC_IMR           0x28
 138 #define AT91_RTC_IRQ_MASK      0x1f
 139
 140 void __init aic_common_rtc_irq_fixup(struct device_node *root)
 141 {
 142         struct device_node *np;
 143         void __iomem *regs;
 144
 145         np = of_find_compatible_node(root, NULL, "atmel,at91rm9200-rtc");
 146         if (!np)
 147                 np = of_find_compatible_node(root, NULL,
 148                                              "atmel,at91sam9x5-rtc");
 149
 150         if (!np)
 151                 return;
 152
 153         regs = of_iomap(np, 0);
 154         of_node_put(np);
 155
 156         if (!regs)
 157                 return;
 158
 159         writel(AT91_RTC_IRQ_MASK, regs + AT91_RTC_IDR);
 160
 161         iounmap(regs);
 162 }
 163
 164 #define AT91_RTT_MR             0x00                    /* Real-time Mode Register */
 165 #define AT91_RTT_ALMIEN         (1 << 16)               /* Alarm Interrupt Enable */
 166 #define AT91_RTT_RTTINCIEN      (1 << 17)               /* Real Time Timer Increment Interrupt Enable */
 167
 168 void __init aic_common_rtt_irq_fixup(struct device_node *root)
 169 {
 170         struct device_node *np;
 171         void __iomem *regs;
 172
 173         /*
 174          * The at91sam9263 SoC has 2 instances of the RTT block, hence we
 175          * iterate over the DT to find each occurrence.
 176          */
 177         for_each_compatible_node(np, NULL, "atmel,at91sam9260-rtt") {
 178                 regs = of_iomap(np, 0);
 179                 if (!regs)
 180                         continue;
 181
 182                 writel(readl(regs + AT91_RTT_MR) &
 183                        ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN),
 184                        regs + AT91_RTT_MR);
 185
 186                 iounmap(regs);
 187         }
 188 }
 189
 190 static void __init aic_common_irq_fixup(const struct of_device_id *matches)
 191 {
 192         struct device_node *root = of_find_node_by_path("/");
 193         const struct of_device_id *match;
 194
 195         if (!root)
 196                 return;
 197
 198         match = of_match_node(matches, root);
 199         of_node_put(root);
 200
 201         if (match) {
 202                 void (*fixup)(struct device_node *) = match->data;
 203                 fixup(root);
 204         }
 205
 206         of_node_put(root);
 207 }
 208
 209 struct irq_domain *__init aic_common_of_init(struct device_node *node,
 210                                              const struct irq_domain_ops *ops,
 211                                              const char *name, int nirqs,
 212                                              const struct of_device_id *matches)
 213 {
 214         struct irq_chip_generic *gc;
 215         struct irq_domain *domain;
 216         struct aic_chip_data *aic;
 217         void __iomem *reg_base;
 218         int nchips;
 219         int ret;
 220         int i;
 221
 222         nchips = DIV_ROUND_UP(nirqs, 32);
 223
 224         reg_base = of_iomap(node, 0);
 225         if (!reg_base)
 226                 return ERR_PTR(-ENOMEM);
 227
 228         aic = kcalloc(nchips, sizeof(*aic), GFP_KERNEL);
 229         if (!aic) {
 230                 ret = -ENOMEM;
 231                 goto err_iounmap;
 232         }
 233
 234         domain = irq_domain_add_linear(node, nchips * 32, ops, aic);
 235         if (!domain) {
 236                 ret = -ENOMEM;
 237                 goto err_free_aic;
 238         }
 239
 240         ret = irq_alloc_domain_generic_chips(domain, 32, 1, name,
 241                                              handle_fasteoi_irq,
 242                                              IRQ_NOREQUEST | IRQ_NOPROBE |
 243                                              IRQ_NOAUTOEN, 0, 0);
 244         if (ret)
 245                 goto err_domain_remove;
 246
 247         for (i = 0; i < nchips; i++) {
 248                 gc = irq_get_domain_generic_chip(domain, i * 32);
 249
 250                 gc->reg_base = reg_base;
 251
 252                 gc->unused = 0;
 253                 gc->wake_enabled = ~0;
 254                 gc->chip_types[0].type = IRQ_TYPE_SENSE_MASK;
 255                 gc->chip_types[0].chip.irq_eoi = irq_gc_eoi;
 256                 gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
 257                 gc->chip_types[0].chip.irq_shutdown = aic_common_shutdown;
 258                 gc->private = &aic[i];
 259         }
 260
 261         aic_common_ext_irq_of_init(domain);
 262         aic_common_irq_fixup(matches);
 263
 264         return domain;
 265
 266 err_domain_remove:
 267         irq_domain_remove(domain);
 268
 269 err_free_aic:
 270         kfree(aic);
 271
 272 err_iounmap:
 273         iounmap(reg_base);
 274
 275         return ERR_PTR(ret);
 276 }