arch/arm/mach-pxa/irq.c

   1 /*
   2  *  linux/arch/arm/mach-pxa/irq.c
   3  *
   4  *  Generic PXA IRQ handling
   5  *
   6  *  Author:     Nicolas Pitre
   7  *  Created:    Jun 15, 2001
   8  *  Copyright:  MontaVista Software Inc.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation.
  13  */
  14 #include <linux/bitops.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/syscore_ops.h>
  19 #include <linux/io.h>
  20 #include <linux/irq.h>
  21 #include <linux/of_address.h>
  22 #include <linux/of_irq.h>
  23
  24 #include <asm/exception.h>
  25
  26 #include <mach/hardware.h>
  27 #include <mach/irqs.h>
  28
  29 #include "generic.h"
  30
  31 #define ICIP                    (0x000)
  32 #define ICMR                    (0x004)
  33 #define ICLR                    (0x008)
  34 #define ICFR                    (0x00c)
  35 #define ICPR                    (0x010)
  36 #define ICCR                    (0x014)
  37 #define ICHP                    (0x018)
  38 #define IPR(i)                  (((i) < 32) ? (0x01c + ((i) << 2)) :            \
  39                                 ((i) < 64) ? (0x0b0 + (((i) - 32) << 2)) :      \
  40                                       (0x144 + (((i) - 64) << 2)))
  41 #define ICHP_VAL_IRQ            (1 << 31)
  42 #define ICHP_IRQ(i)             (((i) >> 16) & 0x7fff)
  43 #define IPR_VALID               (1 << 31)
  44
  45 #define MAX_INTERNAL_IRQS       128
  46
  47 /*
  48  * This is for peripheral IRQs internal to the PXA chip.
  49  */
  50
  51 static void __iomem *pxa_irq_base;
  52 static int pxa_internal_irq_nr;
  53 static bool cpu_has_ipr;
  54 static struct irq_domain *pxa_irq_domain;
  55
  56 static inline void __iomem *irq_base(int i)
  57 {
  58         static unsigned long phys_base_offset[] = {
  59                 0x0,
  60                 0x9c,
  61                 0x130,
  62         };
  63
  64         return pxa_irq_base + phys_base_offset[i];
  65 }
  66
  67 void pxa_mask_irq(struct irq_data *d)
  68 {
  69         void __iomem *base = irq_data_get_irq_chip_data(d);
  70         irq_hw_number_t irq = irqd_to_hwirq(d);
  71         uint32_t icmr = __raw_readl(base + ICMR);
  72
  73         icmr &= ~BIT(irq & 0x1f);
  74         __raw_writel(icmr, base + ICMR);
  75 }
  76
  77 void pxa_unmask_irq(struct irq_data *d)
  78 {
  79         void __iomem *base = irq_data_get_irq_chip_data(d);
  80         irq_hw_number_t irq = irqd_to_hwirq(d);
  81         uint32_t icmr = __raw_readl(base + ICMR);
  82
  83         icmr |= BIT(irq & 0x1f);
  84         __raw_writel(icmr, base + ICMR);
  85 }
  86
  87 static struct irq_chip pxa_internal_irq_chip = {
  88         .name           = "SC",
  89         .irq_ack        = pxa_mask_irq,
  90         .irq_mask       = pxa_mask_irq,
  91         .irq_unmask     = pxa_unmask_irq,
  92 };
  93
  94 asmlinkage void __exception_irq_entry icip_handle_irq(struct pt_regs *regs)
  95 {
  96         uint32_t icip, icmr, mask;
  97
  98         do {
  99                 icip = __raw_readl(pxa_irq_base + ICIP);
 100                 icmr = __raw_readl(pxa_irq_base + ICMR);
 101                 mask = icip & icmr;
 102
 103                 if (mask == 0)
 104                         break;
 105
 106                 handle_IRQ(PXA_IRQ(fls(mask) - 1), regs);
 107         } while (1);
 108 }
 109
 110 asmlinkage void __exception_irq_entry ichp_handle_irq(struct pt_regs *regs)
 111 {
 112         uint32_t ichp;
 113
 114         do {
 115                 __asm__ __volatile__("mrc p6, 0, %0, c5, c0, 0\n": "=r"(ichp));
 116
 117                 if ((ichp & ICHP_VAL_IRQ) == 0)
 118                         break;
 119
 120                 handle_IRQ(PXA_IRQ(ICHP_IRQ(ichp)), regs);
 121         } while (1);
 122 }
 123
 124 static int pxa_irq_map(struct irq_domain *h, unsigned int virq,
 125                        irq_hw_number_t hw)
 126 {
 127         void __iomem *base = irq_base(hw / 32);
 128
 129         /* initialize interrupt priority */
 130         if (cpu_has_ipr)
 131                 __raw_writel(hw | IPR_VALID, pxa_irq_base + IPR(hw));
 132
 133         irq_set_chip_and_handler(virq, &pxa_internal_irq_chip,
 134                                  handle_level_irq);
 135         irq_set_chip_data(virq, base);
 136
 137         return 0;
 138 }
 139
 140 static const struct irq_domain_ops pxa_irq_ops = {
 141         .map    = pxa_irq_map,
 142         .xlate  = irq_domain_xlate_onecell,
 143 };
 144
 145 static __init void
 146 pxa_init_irq_common(struct device_node *node, int irq_nr,
 147                     int (*fn)(struct irq_data *, unsigned int))
 148 {
 149         int n;
 150
 151         pxa_internal_irq_nr = irq_nr;
 152         pxa_irq_domain = irq_domain_add_legacy(node, irq_nr,
 153                                                PXA_IRQ(0), 0,
 154                                                &pxa_irq_ops, NULL);
 155         if (!pxa_irq_domain)
 156                 panic("Unable to add PXA IRQ domain\n");
 157         irq_set_default_host(pxa_irq_domain);
 158
 159         for (n = 0; n < irq_nr; n += 32) {
 160                 void __iomem *base = irq_base(n >> 5);
 161
 162                 __raw_writel(0, base + ICMR);   /* disable all IRQs */
 163                 __raw_writel(0, base + ICLR);   /* all IRQs are IRQ, not FIQ */
 164         }
 165         /* only unmasked interrupts kick us out of idle */
 166         __raw_writel(1, irq_base(0) + ICCR);
 167
 168         pxa_internal_irq_chip.irq_set_wake = fn;
 169 }
 170
 171 void __init pxa_init_irq(int irq_nr, int (*fn)(struct irq_data *, unsigned int))
 172 {
 173         BUG_ON(irq_nr > MAX_INTERNAL_IRQS);
 174
 175         pxa_irq_base = io_p2v(0x40d00000);
 176         cpu_has_ipr = !cpu_is_pxa25x();
 177         pxa_init_irq_common(NULL, irq_nr, fn);
 178 }
 179
 180 #ifdef CONFIG_PM
 181 static unsigned long saved_icmr[MAX_INTERNAL_IRQS/32];
 182 static unsigned long saved_ipr[MAX_INTERNAL_IRQS];
 183
 184 static int pxa_irq_suspend(void)
 185 {
 186         int i;
 187
 188         for (i = 0; i < DIV_ROUND_UP(pxa_internal_irq_nr, 32); i++) {
 189                 void __iomem *base = irq_base(i);
 190
 191                 saved_icmr[i] = __raw_readl(base + ICMR);
 192                 __raw_writel(0, base + ICMR);
 193         }
 194
 195         if (cpu_has_ipr) {
 196                 for (i = 0; i < pxa_internal_irq_nr; i++)
 197                         saved_ipr[i] = __raw_readl(pxa_irq_base + IPR(i));
 198         }
 199
 200         return 0;
 201 }
 202
 203 static void pxa_irq_resume(void)
 204 {
 205         int i;
 206
 207         for (i = 0; i < DIV_ROUND_UP(pxa_internal_irq_nr, 32); i++) {
 208                 void __iomem *base = irq_base(i);
 209
 210                 __raw_writel(saved_icmr[i], base + ICMR);
 211                 __raw_writel(0, base + ICLR);
 212         }
 213
 214         if (cpu_has_ipr)
 215                 for (i = 0; i < pxa_internal_irq_nr; i++)
 216                         __raw_writel(saved_ipr[i], pxa_irq_base + IPR(i));
 217
 218         __raw_writel(1, pxa_irq_base + ICCR);
 219 }
 220 #else
 221 #define pxa_irq_suspend         NULL
 222 #define pxa_irq_resume          NULL
 223 #endif
 224
 225 struct syscore_ops pxa_irq_syscore_ops = {
 226         .suspend        = pxa_irq_suspend,
 227         .resume         = pxa_irq_resume,
 228 };
 229
 230 #ifdef CONFIG_OF
 231 static const struct of_device_id intc_ids[] __initconst = {
 232         { .compatible = "marvell,pxa-intc", },
 233         {}
 234 };
 235
 236 void __init pxa_dt_irq_init(int (*fn)(struct irq_data *, unsigned int))
 237 {
 238         struct device_node *node;
 239         struct resource res;
 240         int ret;
 241
 242         node = of_find_matching_node(NULL, intc_ids);
 243         if (!node) {
 244                 pr_err("Failed to find interrupt controller in arch-pxa\n");
 245                 return;
 246         }
 247
 248         ret = of_property_read_u32(node, "marvell,intc-nr-irqs",
 249                                    &pxa_internal_irq_nr);
 250         if (ret) {
 251                 pr_err("Not found marvell,intc-nr-irqs property\n");
 252                 return;
 253         }
 254
 255         ret = of_address_to_resource(node, 0, &res);
 256         if (ret < 0) {
 257                 pr_err("No registers defined for node\n");
 258                 return;
 259         }
 260         pxa_irq_base = io_p2v(res.start);
 261
 262         if (of_find_property(node, "marvell,intc-priority", NULL))
 263                 cpu_has_ipr = 1;
 264
 265         ret = irq_alloc_descs(-1, 0, pxa_internal_irq_nr, 0);
 266         if (ret < 0) {
 267                 pr_err("Failed to allocate IRQ numbers\n");
 268                 return;
 269         }
 270
 271         pxa_init_irq_common(node, pxa_internal_irq_nr, fn);
 272 }
 273 #endif /* CONFIG_OF */