target/linux/brcm2708/patches-3.18/0050-BCM2708-armctrl-Add-IRQ-Device-Tree-support.patch

   1 From 6be3809614db2d52724eb4b5193c27d2466142be Mon Sep 17 00:00:00 2001
   2 From: notro <notro@tronnes.org>
   3 Date: Wed, 9 Jul 2014 14:47:48 +0200
   4 Subject: [PATCH 050/114] BCM2708: armctrl: Add IRQ Device Tree support
   5
   6 Add Device Tree IRQ support for BCM2708.
   7 Usage is the same as for irq-bcm2835.
   8 See binding document: brcm,bcm2835-armctrl-ic.txt
   9
  10 A bank 3 is added to handle GPIO interrupts. This is done because
  11 armctrl also handles GPIO interrupts.
  12
  13 Signed-off-by: Noralf Tronnes <notro@tronnes.org>
  14
  15 BCM2708: armctrl: remove irq bank 3
  16
  17 irq bank 3 was needed by the pinctrl-bcm2708 and bcm2708_gpio
  18 combination. It is no longer required.
  19
  20 Signed-off-by: Noralf Tronnes <notro@tronnes.org>
  21 ---
  22  arch/arm/boot/dts/bcm2708.dtsi  |  9 ++++
  23  arch/arm/mach-bcm2708/armctrl.c | 96 +++++++++++++++++++++++++++++++++++++++++
  24  2 files changed, 105 insertions(+)
  25
  26 --- a/arch/arm/boot/dts/bcm2708.dtsi
  27 +++ b/arch/arm/boot/dts/bcm2708.dtsi
  28 @@ -4,6 +4,8 @@
  29         compatible = "brcm,bcm2708";
  30         model = "BCM2708";
  31
  32 +       interrupt-parent = <&intc>;
  33 +
  34         chosen {
  35                 /*
  36                    bootargs must be 1024 characters long because the
  37 @@ -17,6 +19,13 @@
  38                 #address-cells = <1>;
  39                 #size-cells = <1>;
  40                 ranges = <0x7e000000 0x20000000 0x02000000>;
  41 +
  42 +               intc: interrupt-controller {
  43 +                       compatible = "brcm,bcm2708-armctrl-ic";
  44 +                       reg = <0x7e00b200 0x200>;
  45 +                       interrupt-controller;
  46 +                       #interrupt-cells = <2>;
  47 +               };
  48         };
  49
  50         clocks {
  51 --- a/arch/arm/mach-bcm2708/armctrl.c
  52 +++ b/arch/arm/mach-bcm2708/armctrl.c
  53 @@ -23,6 +23,8 @@
  54  #include <linux/version.h>
  55  #include <linux/syscore_ops.h>
  56  #include <linux/interrupt.h>
  57 +#include <linux/irqdomain.h>
  58 +#include <linux/of.h>
  59
  60  #include <asm/mach/irq.h>
  61  #include <mach/hardware.h>
  62 @@ -79,6 +81,99 @@ static void armctrl_unmask_irq(struct ir
  63         }
  64  }
  65
  66 +#ifdef CONFIG_OF
  67 +
  68 +#define NR_IRQS_BANK0           21
  69 +#define NR_BANKS                3
  70 +#define IRQS_PER_BANK           32
  71 +
  72 +/* from drivers/irqchip/irq-bcm2835.c */
  73 +static int armctrl_xlate(struct irq_domain *d, struct device_node *ctrlr,
  74 +        const u32 *intspec, unsigned int intsize,
  75 +        unsigned long *out_hwirq, unsigned int *out_type)
  76 +{
  77 +        if (WARN_ON(intsize != 2))
  78 +                return -EINVAL;
  79 +
  80 +        if (WARN_ON(intspec[0] >= NR_BANKS))
  81 +                return -EINVAL;
  82 +
  83 +        if (WARN_ON(intspec[1] >= IRQS_PER_BANK))
  84 +                return -EINVAL;
  85 +
  86 +        if (WARN_ON(intspec[0] == 0 && intspec[1] >= NR_IRQS_BANK0))
  87 +                return -EINVAL;
  88 +
  89 +       if (intspec[0] == 0)
  90 +               *out_hwirq = ARM_IRQ0_BASE + intspec[1];
  91 +       else if (intspec[0] == 1)
  92 +               *out_hwirq = ARM_IRQ1_BASE + intspec[1];
  93 +       else
  94 +               *out_hwirq = ARM_IRQ2_BASE + intspec[1];
  95 +
  96 +       /* reverse remap_irqs[] */
  97 +       switch (*out_hwirq) {
  98 +       case INTERRUPT_VC_JPEG:
  99 +               *out_hwirq = INTERRUPT_JPEG;
 100 +               break;
 101 +       case INTERRUPT_VC_USB:
 102 +               *out_hwirq = INTERRUPT_USB;
 103 +               break;
 104 +       case INTERRUPT_VC_3D:
 105 +               *out_hwirq = INTERRUPT_3D;
 106 +               break;
 107 +       case INTERRUPT_VC_DMA2:
 108 +               *out_hwirq = INTERRUPT_DMA2;
 109 +               break;
 110 +       case INTERRUPT_VC_DMA3:
 111 +               *out_hwirq = INTERRUPT_DMA3;
 112 +               break;
 113 +       case INTERRUPT_VC_I2C:
 114 +               *out_hwirq = INTERRUPT_I2C;
 115 +               break;
 116 +       case INTERRUPT_VC_SPI:
 117 +               *out_hwirq = INTERRUPT_SPI;
 118 +               break;
 119 +       case INTERRUPT_VC_I2SPCM:
 120 +               *out_hwirq = INTERRUPT_I2SPCM;
 121 +               break;
 122 +       case INTERRUPT_VC_SDIO:
 123 +               *out_hwirq = INTERRUPT_SDIO;
 124 +               break;
 125 +       case INTERRUPT_VC_UART:
 126 +               *out_hwirq = INTERRUPT_UART;
 127 +               break;
 128 +       case INTERRUPT_VC_ARASANSDIO:
 129 +               *out_hwirq = INTERRUPT_ARASANSDIO;
 130 +               break;
 131 +       }
 132 +
 133 +        *out_type = IRQ_TYPE_NONE;
 134 +        return 0;
 135 +}
 136 +
 137 +static struct irq_domain_ops armctrl_ops = {
 138 +        .xlate = armctrl_xlate
 139 +};
 140 +
 141 +void __init armctrl_dt_init(void)
 142 +{
 143 +       struct device_node *np;
 144 +       struct irq_domain *domain;
 145 +
 146 +       np = of_find_compatible_node(NULL, NULL, "brcm,bcm2708-armctrl-ic");
 147 +       if (!np)
 148 +               return;
 149 +
 150 +       domain = irq_domain_add_legacy(np, BCM2708_ALLOC_IRQS,
 151 +                                       IRQ_ARMCTRL_START, 0,
 152 +                                       &armctrl_ops, NULL);
 153 +        WARN_ON(!domain);
 154 +}
 155 +#else
 156 +void __init armctrl_dt_init(void) { }
 157 +#endif /* CONFIG_OF */
 158 +
 159  #if defined(CONFIG_PM)
 160
 161  /* for kernels 3.xx use the new syscore_ops apis but for older kernels use the sys dev class */
 162 @@ -215,5 +310,6 @@ int __init armctrl_init(void __iomem * b
 163
 164         armctrl_pm_register(base, irq_start, resume_sources);
 165         init_FIQ(FIQ_START);
 166 +       armctrl_dt_init();
 167         return 0;
 168  }