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_HIPND(i)   (0x0D80+ ((i) << 2))    /* 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 #define TZIC_NUM_IRQS 128
  53
  54 #ifdef CONFIG_FIQ
  55 static int tzic_set_irq_fiq(unsigned int irq, unsigned int type)
  56 {
  57         unsigned int index, mask, value;
  58
  59         index = irq >> 5;
  60         if (unlikely(index >= 4))
  61                 return -EINVAL;
  62         mask = 1U << (irq & 0x1F);
  63
  64         value = __raw_readl(tzic_base + TZIC_INTSEC0(index)) | mask;
  65         if (type)
  66                 value &= ~mask;
  67         __raw_writel(value, tzic_base + TZIC_INTSEC0(index));
  68
  69         return 0;
  70 }
  71 #else
  72 #define tzic_set_irq_fiq NULL
  73 #endif
  74
  75 static unsigned int *wakeup_intr[4];
  76
  77 static struct mxc_extra_irq tzic_extra_irq = {
  78 #ifdef CONFIG_FIQ
  79         .set_irq_fiq = tzic_set_irq_fiq,
  80 #endif
  81 };
  82
  83 static __init void tzic_init_gc(unsigned int irq_start)
  84 {
  85         struct irq_chip_generic *gc;
  86         struct irq_chip_type *ct;
  87         int idx = irq_start >> 5;
  88
  89         gc = irq_alloc_generic_chip("tzic", 1, irq_start, tzic_base,
  90                                     handle_level_irq);
  91         gc->private = &tzic_extra_irq;
  92         gc->wake_enabled = IRQ_MSK(32);
  93         wakeup_intr[idx] = &gc->wake_active;
  94
  95         ct = gc->chip_types;
  96         ct->chip.irq_mask = irq_gc_mask_disable_reg;
  97         ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
  98         ct->chip.irq_set_wake = irq_gc_set_wake;
  99         ct->regs.disable = TZIC_ENCLEAR0(idx);
 100         ct->regs.enable = TZIC_ENSET0(idx);
 101
 102         irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
 103 }
 104
 105 asmlinkage void __exception_irq_entry tzic_handle_irq(struct pt_regs *regs)
 106 {
 107         u32 stat;
 108         int i, irqofs, handled;
 109
 110         do {
 111                 handled = 0;
 112
 113                 for (i = 0; i < 4; i++) {
 114                         stat = __raw_readl(tzic_base + TZIC_HIPND(i)) &
 115                                 __raw_readl(tzic_base + TZIC_INTSEC0(i));
 116
 117                         while (stat) {
 118                                 handled = 1;
 119                                 irqofs = fls(stat) - 1;
 120                                 handle_IRQ(irqofs + i * 32, regs);
 121                                 stat &= ~(1 << irqofs);
 122                         }
 123                 }
 124         } while (handled);
 125 }
 126
 127 /*
 128  * This function initializes the TZIC hardware and disables all the
 129  * interrupts. It registers the interrupt enable and disable functions
 130  * to the kernel for each interrupt source.
 131  */
 132 void __init tzic_init_irq(void __iomem *irqbase)
 133 {
 134         int i;
 135
 136         tzic_base = irqbase;
 137         /* put the TZIC into the reset value with
 138          * all interrupts disabled
 139          */
 140         i = __raw_readl(tzic_base + TZIC_INTCNTL);
 141
 142         __raw_writel(0x80010001, tzic_base + TZIC_INTCNTL);
 143         __raw_writel(0x1f, tzic_base + TZIC_PRIOMASK);
 144         __raw_writel(0x02, tzic_base + TZIC_SYNCCTRL);
 145
 146         for (i = 0; i < 4; i++)
 147                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i));
 148
 149         /* disable all interrupts */
 150         for (i = 0; i < 4; i++)
 151                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i));
 152
 153         /* all IRQ no FIQ Warning :: No selection */
 154
 155         for (i = 0; i < TZIC_NUM_IRQS; i += 32)
 156                 tzic_init_gc(i);
 157
 158 #ifdef CONFIG_FIQ
 159         /* Initialize FIQ */
 160         init_FIQ();
 161 #endif
 162
 163         pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
 164 }
 165
 166 /**
 167  * tzic_enable_wake() - enable wakeup interrupt
 168  *
 169  * @param is_idle               1 if called in idle loop (ENSET0 register);
 170  *                              0 to be used when called from low power entry
 171  * @return                      0 if successful; non-zero otherwise
 172  */
 173 int tzic_enable_wake(int is_idle)
 174 {
 175         unsigned int i, v;
 176
 177         __raw_writel(1, tzic_base + TZIC_DSMINT);
 178         if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0))
 179                 return -EAGAIN;
 180
 181         for (i = 0; i < 4; i++) {
 182                 v = is_idle ? __raw_readl(tzic_base + TZIC_ENSET0(i)) :
 183                         *wakeup_intr[i];
 184                 __raw_writel(v, tzic_base + TZIC_WAKEUP0(i));
 185         }
 186
 187         return 0;
 188 }