arch/arm/mach-davinci/irq.c

   1 /*
   2  * Interrupt handler for DaVinci boards.
   3  *
   4  * Copyright (C) 2006 Texas Instruments.
   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  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/irq.h>
  25
  26 #include <mach/hardware.h>
  27 #include <asm/io.h>
  28 #include <asm/mach/irq.h>
  29
  30 #define IRQ_BIT(irq)            ((irq) & 0x1f)
  31
  32 #define FIQ_REG0_OFFSET         0x0000
  33 #define FIQ_REG1_OFFSET         0x0004
  34 #define IRQ_REG0_OFFSET         0x0008
  35 #define IRQ_REG1_OFFSET         0x000C
  36 #define IRQ_ENT_REG0_OFFSET     0x0018
  37 #define IRQ_ENT_REG1_OFFSET     0x001C
  38 #define IRQ_INCTL_REG_OFFSET    0x0020
  39 #define IRQ_EABASE_REG_OFFSET   0x0024
  40 #define IRQ_INTPRI0_REG_OFFSET  0x0030
  41 #define IRQ_INTPRI7_REG_OFFSET  0x004C
  42
  43 static inline unsigned int davinci_irq_readl(int offset)
  44 {
  45         return davinci_readl(DAVINCI_ARM_INTC_BASE + offset);
  46 }
  47
  48 static inline void davinci_irq_writel(unsigned long value, int offset)
  49 {
  50         davinci_writel(value, DAVINCI_ARM_INTC_BASE + offset);
  51 }
  52
  53 /* Disable interrupt */
  54 static void davinci_mask_irq(unsigned int irq)
  55 {
  56         unsigned int mask;
  57         u32 l;
  58
  59         mask = 1 << IRQ_BIT(irq);
  60
  61         if (irq > 31) {
  62                 l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
  63                 l &= ~mask;
  64                 davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
  65         } else {
  66                 l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
  67                 l &= ~mask;
  68                 davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
  69         }
  70 }
  71
  72 /* Enable interrupt */
  73 static void davinci_unmask_irq(unsigned int irq)
  74 {
  75         unsigned int mask;
  76         u32 l;
  77
  78         mask = 1 << IRQ_BIT(irq);
  79
  80         if (irq > 31) {
  81                 l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
  82                 l |= mask;
  83                 davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
  84         } else {
  85                 l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
  86                 l |= mask;
  87                 davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
  88         }
  89 }
  90
  91 /* EOI interrupt */
  92 static void davinci_ack_irq(unsigned int irq)
  93 {
  94         unsigned int mask;
  95
  96         mask = 1 << IRQ_BIT(irq);
  97
  98         if (irq > 31)
  99                 davinci_irq_writel(mask, IRQ_REG1_OFFSET);
 100         else
 101                 davinci_irq_writel(mask, IRQ_REG0_OFFSET);
 102 }
 103
 104 static struct irq_chip davinci_irq_chip_0 = {
 105         .name   = "AINTC",
 106         .ack    = davinci_ack_irq,
 107         .mask   = davinci_mask_irq,
 108         .unmask = davinci_unmask_irq,
 109 };
 110
 111
 112 /* FIQ are pri 0-1; otherwise 2-7, with 7 lowest priority */
 113 static const u8 default_priorities[DAVINCI_N_AINTC_IRQ] __initdata = {
 114         [IRQ_VDINT0]            = 2,
 115         [IRQ_VDINT1]            = 6,
 116         [IRQ_VDINT2]            = 6,
 117         [IRQ_HISTINT]           = 6,
 118         [IRQ_H3AINT]            = 6,
 119         [IRQ_PRVUINT]           = 6,
 120         [IRQ_RSZINT]            = 6,
 121         [7]                     = 7,
 122         [IRQ_VENCINT]           = 6,
 123         [IRQ_ASQINT]            = 6,
 124         [IRQ_IMXINT]            = 6,
 125         [IRQ_VLCDINT]           = 6,
 126         [IRQ_USBINT]            = 4,
 127         [IRQ_EMACINT]           = 4,
 128         [14]                    = 7,
 129         [15]                    = 7,
 130         [IRQ_CCINT0]            = 5,    /* dma */
 131         [IRQ_CCERRINT]          = 5,    /* dma */
 132         [IRQ_TCERRINT0]         = 5,    /* dma */
 133         [IRQ_TCERRINT]          = 5,    /* dma */
 134         [IRQ_PSCIN]             = 7,
 135         [21]                    = 7,
 136         [IRQ_IDE]               = 4,
 137         [23]                    = 7,
 138         [IRQ_MBXINT]            = 7,
 139         [IRQ_MBRINT]            = 7,
 140         [IRQ_MMCINT]            = 7,
 141         [IRQ_SDIOINT]           = 7,
 142         [28]                    = 7,
 143         [IRQ_DDRINT]            = 7,
 144         [IRQ_AEMIFINT]          = 7,
 145         [IRQ_VLQINT]            = 4,
 146         [IRQ_TINT0_TINT12]      = 2,    /* clockevent */
 147         [IRQ_TINT0_TINT34]      = 2,    /* clocksource */
 148         [IRQ_TINT1_TINT12]      = 7,    /* DSP timer */
 149         [IRQ_TINT1_TINT34]      = 7,    /* system tick */
 150         [IRQ_PWMINT0]           = 7,
 151         [IRQ_PWMINT1]           = 7,
 152         [IRQ_PWMINT2]           = 7,
 153         [IRQ_I2C]               = 3,
 154         [IRQ_UARTINT0]          = 3,
 155         [IRQ_UARTINT1]          = 3,
 156         [IRQ_UARTINT2]          = 3,
 157         [IRQ_SPINT0]            = 3,
 158         [IRQ_SPINT1]            = 3,
 159         [45]                    = 7,
 160         [IRQ_DSP2ARM0]          = 4,
 161         [IRQ_DSP2ARM1]          = 4,
 162         [IRQ_GPIO0]             = 7,
 163         [IRQ_GPIO1]             = 7,
 164         [IRQ_GPIO2]             = 7,
 165         [IRQ_GPIO3]             = 7,
 166         [IRQ_GPIO4]             = 7,
 167         [IRQ_GPIO5]             = 7,
 168         [IRQ_GPIO6]             = 7,
 169         [IRQ_GPIO7]             = 7,
 170         [IRQ_GPIOBNK0]          = 7,
 171         [IRQ_GPIOBNK1]          = 7,
 172         [IRQ_GPIOBNK2]          = 7,
 173         [IRQ_GPIOBNK3]          = 7,
 174         [IRQ_GPIOBNK4]          = 7,
 175         [IRQ_COMMTX]            = 7,
 176         [IRQ_COMMRX]            = 7,
 177         [IRQ_EMUINT]            = 7,
 178 };
 179
 180 /* ARM Interrupt Controller Initialization */
 181 void __init davinci_irq_init(void)
 182 {
 183         unsigned i;
 184         const u8 *priority = default_priorities;
 185
 186         /* Clear all interrupt requests */
 187         davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
 188         davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
 189         davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
 190         davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
 191
 192         /* Disable all interrupts */
 193         davinci_irq_writel(0x0, IRQ_ENT_REG0_OFFSET);
 194         davinci_irq_writel(0x0, IRQ_ENT_REG1_OFFSET);
 195
 196         /* Interrupts disabled immediately, IRQ entry reflects all */
 197         davinci_irq_writel(0x0, IRQ_INCTL_REG_OFFSET);
 198
 199         /* we don't use the hardware vector table, just its entry addresses */
 200         davinci_irq_writel(0, IRQ_EABASE_REG_OFFSET);
 201
 202         /* Clear all interrupt requests */
 203         davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
 204         davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
 205         davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
 206         davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
 207
 208         for (i = IRQ_INTPRI0_REG_OFFSET; i <= IRQ_INTPRI7_REG_OFFSET; i += 4) {
 209                 unsigned        j;
 210                 u32             pri;
 211
 212                 for (j = 0, pri = 0; j < 32; j += 4, priority++)
 213                         pri |= (*priority & 0x07) << j;
 214                 davinci_irq_writel(pri, i);
 215         }
 216
 217         /* set up genirq dispatch for ARM INTC */
 218         for (i = 0; i < DAVINCI_N_AINTC_IRQ; i++) {
 219                 set_irq_chip(i, &davinci_irq_chip_0);
 220                 set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 221                 if (i != IRQ_TINT1_TINT34)
 222                         set_irq_handler(i, handle_edge_irq);
 223                 else
 224                         set_irq_handler(i, handle_level_irq);
 225         }
 226 }