arch/arm/plat-mxc/tzic.c

   1 /*
   2  * Copyright (C)2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
   3  *
   4  * The code contained herein is licensed under the GNU General Public
   5  * License. You may obtain a copy of the GNU General Public License
   6  * Version 2 or later at the following locations:
   7  *
   8  * http://www.opensource.org/licenses/gpl-license.html
   9  * http://www.gnu.org/copyleft/gpl.html
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/moduleparam.h>
  14 #include <linux/init.h>
  15 #include <linux/device.h>
  16 #include <linux/errno.h>
  17 #include <linux/io.h>
  18
  19 #include <asm/mach/irq.h>
  20
  21 #include <mach/hardware.h>
  22 #include <mach/common.h>
  23
  24 #include "irq-common.h"
  25
  26 /*
  27  *****************************************
  28  * TZIC Registers                        *
  29  *****************************************
  30  */
  31
  32 #define TZIC_INTCNTL    0x0000  /* Control register */
  33 #define TZIC_INTTYPE    0x0004  /* Controller Type register */
  34 #define TZIC_IMPID      0x0008  /* Distributor Implementer Identification */
  35 #define TZIC_PRIOMASK   0x000C  /* Priority Mask Reg */
  36 #define TZIC_SYNCCTRL   0x0010  /* Synchronizer Control register */
  37 #define TZIC_DSMINT     0x0014  /* DSM interrupt Holdoffregister */
  38 #define TZIC_INTSEC0(i) (0x0080 + ((i) << 2)) /* Interrupt Security Reg 0 */
  39 #define TZIC_ENSET0(i)  (0x0100 + ((i) << 2)) /* Enable Set Reg 0 */
  40 #define TZIC_ENCLEAR0(i) (0x0180 + ((i) << 2)) /* Enable Clear Reg 0 */
  41 #define TZIC_SRCSET0    0x0200  /* Source Set Register 0 */
  42 #define TZIC_SRCCLAR0   0x0280  /* Source Clear Register 0 */
  43 #define TZIC_PRIORITY0  0x0400  /* Priority Register 0 */
  44 #define TZIC_PND0       0x0D00  /* Pending Register 0 */
  45 #define TZIC_HIPND0     0x0D80  /* High Priority Pending Register */
  46 #define TZIC_WAKEUP0(i) (0x0E00 + ((i) << 2))   /* Wakeup Config Register */
  47 #define TZIC_SWINT      0x0F00  /* Software Interrupt Rigger Register */
  48 #define TZIC_ID0        0x0FD0  /* Indentification Register 0 */
  49
  50 void __iomem *tzic_base; /* Used as irq controller base in entry-macro.S */
  51
  52 #ifdef CONFIG_FIQ
  53 static int tzic_set_irq_fiq(unsigned int irq, unsigned int type)
  54 {
  55         unsigned int index, mask, value;
  56
  57         index = irq >> 5;
  58         if (unlikely(index >= 4))
  59                 return -EINVAL;
  60         mask = 1U << (irq & 0x1F);
  61
  62         value = __raw_readl(tzic_base + TZIC_INTSEC0(index)) | mask;
  63         if (type)
  64                 value &= ~mask;
  65         __raw_writel(value, tzic_base + TZIC_INTSEC0(index));
  66
  67         return 0;
  68 }
  69 #endif
  70
  71 /**
  72  * tzic_mask_irq() - Disable interrupt source "d" in the TZIC
  73  *
  74  * @param  d            interrupt source
  75  */
  76 static void tzic_mask_irq(struct irq_data *d)
  77 {
  78         int index, off;
  79
  80         index = d->irq >> 5;
  81         off = d->irq & 0x1F;
  82         __raw_writel(1 << off, tzic_base + TZIC_ENCLEAR0(index));
  83 }
  84
  85 /**
  86  * tzic_unmask_irq() - Enable interrupt source "d" in the TZIC
  87  *
  88  * @param  d            interrupt source
  89  */
  90 static void tzic_unmask_irq(struct irq_data *d)
  91 {
  92         int index, off;
  93
  94         index = d->irq >> 5;
  95         off = d->irq & 0x1F;
  96         __raw_writel(1 << off, tzic_base + TZIC_ENSET0(index));
  97 }
  98
  99 static unsigned int wakeup_intr[4];
 100
 101 /**
 102  * tzic_set_wake_irq() - Set interrupt source "d" in the TZIC as a wake-up source.
 103  *
 104  * @param  d            interrupt source
 105  * @param  enable       enable as wake-up if equal to non-zero
 106  *                      disble as wake-up if equal to zero
 107  *
 108  * @return       This function returns 0 on success.
 109  */
 110 static int tzic_set_wake_irq(struct irq_data *d, unsigned int enable)
 111 {
 112         unsigned int index, off;
 113
 114         index = d->irq >> 5;
 115         off = d->irq & 0x1F;
 116
 117         if (index > 3)
 118                 return -EINVAL;
 119
 120         if (enable)
 121                 wakeup_intr[index] |= (1 << off);
 122         else
 123                 wakeup_intr[index] &= ~(1 << off);
 124
 125         return 0;
 126 }
 127
 128 static struct mxc_irq_chip mxc_tzic_chip = {
 129         .base = {
 130                 .name = "MXC_TZIC",
 131                 .irq_ack = tzic_mask_irq,
 132                 .irq_mask = tzic_mask_irq,
 133                 .irq_unmask = tzic_unmask_irq,
 134                 .irq_set_wake = tzic_set_wake_irq,
 135         },
 136 #ifdef CONFIG_FIQ
 137         .set_irq_fiq = tzic_set_irq_fiq,
 138 #endif
 139 };
 140
 141 /*
 142  * This function initializes the TZIC hardware and disables all the
 143  * interrupts. It registers the interrupt enable and disable functions
 144  * to the kernel for each interrupt source.
 145  */
 146 void __init tzic_init_irq(void __iomem *irqbase)
 147 {
 148         int i;
 149
 150         tzic_base = irqbase;
 151         /* put the TZIC into the reset value with
 152          * all interrupts disabled
 153          */
 154         i = __raw_readl(tzic_base + TZIC_INTCNTL);
 155
 156         __raw_writel(0x80010001, tzic_base + TZIC_INTCNTL);
 157         __raw_writel(0x1f, tzic_base + TZIC_PRIOMASK);
 158         __raw_writel(0x02, tzic_base + TZIC_SYNCCTRL);
 159
 160         for (i = 0; i < 4; i++)
 161                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i));
 162
 163         /* disable all interrupts */
 164         for (i = 0; i < 4; i++)
 165                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i));
 166
 167         /* all IRQ no FIQ Warning :: No selection */
 168
 169         for (i = 0; i < MXC_INTERNAL_IRQS; i++) {
 170                 set_irq_chip(i, &mxc_tzic_chip.base);
 171                 set_irq_handler(i, handle_level_irq);
 172                 set_irq_flags(i, IRQF_VALID);
 173         }
 174
 175 #ifdef CONFIG_FIQ
 176         /* Initialize FIQ */
 177         init_FIQ();
 178 #endif
 179
 180         pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
 181 }
 182
 183 /**
 184  * tzic_enable_wake() - enable wakeup interrupt
 185  *
 186  * @param is_idle               1 if called in idle loop (ENSET0 register);
 187  *                              0 to be used when called from low power entry
 188  * @return                      0 if successful; non-zero otherwise
 189  */
 190 int tzic_enable_wake(int is_idle)
 191 {
 192         unsigned int i, v;
 193
 194         __raw_writel(1, tzic_base + TZIC_DSMINT);
 195         if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0))
 196                 return -EAGAIN;
 197
 198         for (i = 0; i < 4; i++) {
 199                 v = is_idle ? __raw_readl(tzic_base + TZIC_ENSET0(i)) :
 200                         wakeup_intr[i];
 201                 __raw_writel(v, tzic_base + TZIC_WAKEUP0(i));
 202         }
 203
 204         return 0;
 205 }