drivers/irqchip/irq-clps711x.c

   1 /*
   2  *  CLPS711X IRQ driver
   3  *
   4  *  Copyright (C) 2013 Alexander Shiyan <[email protected]>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/io.h>
  13 #include <linux/irq.h>
  14 #include <linux/irqdomain.h>
  15 #include <linux/of_address.h>
  16 #include <linux/of_irq.h>
  17 #include <linux/slab.h>
  18
  19 #include <asm/exception.h>
  20 #include <asm/mach/irq.h>
  21
  22 #include "irqchip.h"
  23
  24 #define CLPS711X_INTSR1 (0x0240)
  25 #define CLPS711X_INTMR1 (0x0280)
  26 #define CLPS711X_BLEOI  (0x0600)
  27 #define CLPS711X_MCEOI  (0x0640)
  28 #define CLPS711X_TEOI   (0x0680)
  29 #define CLPS711X_TC1EOI (0x06c0)
  30 #define CLPS711X_TC2EOI (0x0700)
  31 #define CLPS711X_RTCEOI (0x0740)
  32 #define CLPS711X_UMSEOI (0x0780)
  33 #define CLPS711X_COEOI  (0x07c0)
  34 #define CLPS711X_INTSR2 (0x1240)
  35 #define CLPS711X_INTMR2 (0x1280)
  36 #define CLPS711X_SRXEOF (0x1600)
  37 #define CLPS711X_KBDEOI (0x1700)
  38 #define CLPS711X_INTSR3 (0x2240)
  39 #define CLPS711X_INTMR3 (0x2280)
  40
  41 static const struct {
  42 #define CLPS711X_FLAG_EN        (1 << 0)
  43 #define CLPS711X_FLAG_FIQ       (1 << 1)
  44         unsigned int    flags;
  45         phys_addr_t     eoi;
  46 } clps711x_irqs[] = {
  47         [1]     = { CLPS711X_FLAG_FIQ, CLPS711X_BLEOI, },
  48         [3]     = { CLPS711X_FLAG_FIQ, CLPS711X_MCEOI, },
  49         [4]     = { CLPS711X_FLAG_EN, CLPS711X_COEOI, },
  50         [5]     = { CLPS711X_FLAG_EN, },
  51         [6]     = { CLPS711X_FLAG_EN, },
  52         [7]     = { CLPS711X_FLAG_EN, },
  53         [8]     = { CLPS711X_FLAG_EN, CLPS711X_TC1EOI, },
  54         [9]     = { CLPS711X_FLAG_EN, CLPS711X_TC2EOI, },
  55         [10]    = { CLPS711X_FLAG_EN, CLPS711X_RTCEOI, },
  56         [11]    = { CLPS711X_FLAG_EN, CLPS711X_TEOI, },
  57         [12]    = { CLPS711X_FLAG_EN, },
  58         [13]    = { CLPS711X_FLAG_EN, },
  59         [14]    = { CLPS711X_FLAG_EN, CLPS711X_UMSEOI, },
  60         [15]    = { CLPS711X_FLAG_EN, CLPS711X_SRXEOF, },
  61         [16]    = { CLPS711X_FLAG_EN, CLPS711X_KBDEOI, },
  62         [17]    = { CLPS711X_FLAG_EN, },
  63         [18]    = { CLPS711X_FLAG_EN, },
  64         [28]    = { CLPS711X_FLAG_EN, },
  65         [29]    = { CLPS711X_FLAG_EN, },
  66         [32]    = { CLPS711X_FLAG_FIQ, },
  67 };
  68
  69 static struct {
  70         void __iomem            *base;
  71         void __iomem            *intmr[3];
  72         void __iomem            *intsr[3];
  73         struct irq_domain       *domain;
  74         struct irq_domain_ops   ops;
  75 } *clps711x_intc;
  76
  77 static asmlinkage void __exception_irq_entry clps711x_irqh(struct pt_regs *regs)
  78 {
  79         u32 irqstat;
  80
  81         do {
  82                 irqstat = readw_relaxed(clps711x_intc->intmr[0]) &
  83                           readw_relaxed(clps711x_intc->intsr[0]);
  84                 if (irqstat)
  85                         handle_domain_irq(clps711x_intc->domain,
  86                                           fls(irqstat) - 1, regs);
  87
  88                 irqstat = readw_relaxed(clps711x_intc->intmr[1]) &
  89                           readw_relaxed(clps711x_intc->intsr[1]);
  90                 if (irqstat)
  91                         handle_domain_irq(clps711x_intc->domain,
  92                                           fls(irqstat) - 1 + 16, regs);
  93         } while (irqstat);
  94 }
  95
  96 static void clps711x_intc_eoi(struct irq_data *d)
  97 {
  98         irq_hw_number_t hwirq = irqd_to_hwirq(d);
  99
 100         writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hwirq].eoi);
 101 }
 102
 103 static void clps711x_intc_mask(struct irq_data *d)
 104 {
 105         irq_hw_number_t hwirq = irqd_to_hwirq(d);
 106         void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
 107         u32 tmp;
 108
 109         tmp = readl_relaxed(intmr);
 110         tmp &= ~(1 << (hwirq % 16));
 111         writel_relaxed(tmp, intmr);
 112 }
 113
 114 static void clps711x_intc_unmask(struct irq_data *d)
 115 {
 116         irq_hw_number_t hwirq = irqd_to_hwirq(d);
 117         void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
 118         u32 tmp;
 119
 120         tmp = readl_relaxed(intmr);
 121         tmp |= 1 << (hwirq % 16);
 122         writel_relaxed(tmp, intmr);
 123 }
 124
 125 static struct irq_chip clps711x_intc_chip = {
 126         .name           = "clps711x-intc",
 127         .irq_eoi        = clps711x_intc_eoi,
 128         .irq_mask       = clps711x_intc_mask,
 129         .irq_unmask     = clps711x_intc_unmask,
 130 };
 131
 132 static int __init clps711x_intc_irq_map(struct irq_domain *h, unsigned int virq,
 133                                         irq_hw_number_t hw)
 134 {
 135         irq_flow_handler_t handler = handle_level_irq;
 136         unsigned int flags = IRQF_VALID | IRQF_PROBE;
 137
 138         if (!clps711x_irqs[hw].flags)
 139                 return 0;
 140
 141         if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) {
 142                 handler = handle_bad_irq;
 143                 flags |= IRQF_NOAUTOEN;
 144         } else if (clps711x_irqs[hw].eoi) {
 145                 handler = handle_fasteoi_irq;
 146         }
 147
 148         /* Clear down pending interrupt */
 149         if (clps711x_irqs[hw].eoi)
 150                 writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hw].eoi);
 151
 152         irq_set_chip_and_handler(virq, &clps711x_intc_chip, handler);
 153         set_irq_flags(virq, flags);
 154
 155         return 0;
 156 }
 157
 158 static int __init _clps711x_intc_init(struct device_node *np,
 159                                       phys_addr_t base, resource_size_t size)
 160 {
 161         int err;
 162
 163         clps711x_intc = kzalloc(sizeof(*clps711x_intc), GFP_KERNEL);
 164         if (!clps711x_intc)
 165                 return -ENOMEM;
 166
 167         clps711x_intc->base = ioremap(base, size);
 168         if (!clps711x_intc->base) {
 169                 err = -ENOMEM;
 170                 goto out_kfree;
 171         }
 172
 173         clps711x_intc->intsr[0] = clps711x_intc->base + CLPS711X_INTSR1;
 174         clps711x_intc->intmr[0] = clps711x_intc->base + CLPS711X_INTMR1;
 175         clps711x_intc->intsr[1] = clps711x_intc->base + CLPS711X_INTSR2;
 176         clps711x_intc->intmr[1] = clps711x_intc->base + CLPS711X_INTMR2;
 177         clps711x_intc->intsr[2] = clps711x_intc->base + CLPS711X_INTSR3;
 178         clps711x_intc->intmr[2] = clps711x_intc->base + CLPS711X_INTMR3;
 179
 180         /* Mask all interrupts */
 181         writel_relaxed(0, clps711x_intc->intmr[0]);
 182         writel_relaxed(0, clps711x_intc->intmr[1]);
 183         writel_relaxed(0, clps711x_intc->intmr[2]);
 184
 185         err = irq_alloc_descs(-1, 0, ARRAY_SIZE(clps711x_irqs), numa_node_id());
 186         if (IS_ERR_VALUE(err))
 187                 goto out_iounmap;
 188
 189         clps711x_intc->ops.map = clps711x_intc_irq_map;
 190         clps711x_intc->ops.xlate = irq_domain_xlate_onecell;
 191         clps711x_intc->domain =
 192                 irq_domain_add_legacy(np, ARRAY_SIZE(clps711x_irqs),
 193                                       0, 0, &clps711x_intc->ops, NULL);
 194         if (!clps711x_intc->domain) {
 195                 err = -ENOMEM;
 196                 goto out_irqfree;
 197         }
 198
 199         irq_set_default_host(clps711x_intc->domain);
 200         set_handle_irq(clps711x_irqh);
 201
 202 #ifdef CONFIG_FIQ
 203         init_FIQ(0);
 204 #endif
 205
 206         return 0;
 207
 208 out_irqfree:
 209         irq_free_descs(0, ARRAY_SIZE(clps711x_irqs));
 210
 211 out_iounmap:
 212         iounmap(clps711x_intc->base);
 213
 214 out_kfree:
 215         kfree(clps711x_intc);
 216
 217         return err;
 218 }
 219
 220 void __init clps711x_intc_init(phys_addr_t base, resource_size_t size)
 221 {
 222         BUG_ON(_clps711x_intc_init(NULL, base, size));
 223 }
 224
 225 #ifdef CONFIG_IRQCHIP
 226 static int __init clps711x_intc_init_dt(struct device_node *np,
 227                                         struct device_node *parent)
 228 {
 229         struct resource res;
 230         int err;
 231
 232         err = of_address_to_resource(np, 0, &res);
 233         if (err)
 234                 return err;
 235
 236         return _clps711x_intc_init(np, res.start, resource_size(&res));
 237 }
 238 IRQCHIP_DECLARE(clps711x, "cirrus,clps711x-intc", clps711x_intc_init_dt);
 239 #endif