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 #include <linux/irqdomain.h>
  19 #include <linux/of.h>
  20
  21 #include <asm/mach/irq.h>
  22 #include <asm/exception.h>
  23
  24 #include <mach/hardware.h>
  25 #include <mach/common.h>
  26
  27 #include "irq-common.h"
  28
  29 /*
  30  *****************************************
  31  * TZIC Registers                        *
  32  *****************************************
  33  */
  34
  35 #define TZIC_INTCNTL    0x0000  /* Control register */
  36 #define TZIC_INTTYPE    0x0004  /* Controller Type register */
  37 #define TZIC_IMPID      0x0008  /* Distributor Implementer Identification */
  38 #define TZIC_PRIOMASK   0x000C  /* Priority Mask Reg */
  39 #define TZIC_SYNCCTRL   0x0010  /* Synchronizer Control register */
  40 #define TZIC_DSMINT     0x0014  /* DSM interrupt Holdoffregister */
  41 #define TZIC_INTSEC0(i) (0x0080 + ((i) << 2)) /* Interrupt Security Reg 0 */
  42 #define TZIC_ENSET0(i)  (0x0100 + ((i) << 2)) /* Enable Set Reg 0 */
  43 #define TZIC_ENCLEAR0(i) (0x0180 + ((i) << 2)) /* Enable Clear Reg 0 */
  44 #define TZIC_SRCSET0    0x0200  /* Source Set Register 0 */
  45 #define TZIC_SRCCLAR0   0x0280  /* Source Clear Register 0 */
  46 #define TZIC_PRIORITY0  0x0400  /* Priority Register 0 */
  47 #define TZIC_PND0       0x0D00  /* Pending Register 0 */
  48 #define TZIC_HIPND(i)   (0x0D80+ ((i) << 2))    /* High Priority Pending Register */
  49 #define TZIC_WAKEUP0(i) (0x0E00 + ((i) << 2))   /* Wakeup Config Register */
  50 #define TZIC_SWINT      0x0F00  /* Software Interrupt Rigger Register */
  51 #define TZIC_ID0        0x0FD0  /* Indentification Register 0 */
  52
  53 void __iomem *tzic_base; /* Used as irq controller base in entry-macro.S */
  54 static struct irq_domain *domain;
  55
  56 #define TZIC_NUM_IRQS 128
  57
  58 #ifdef CONFIG_FIQ
  59 static int tzic_set_irq_fiq(unsigned int irq, unsigned int type)
  60 {
  61         unsigned int index, mask, value;
  62
  63         index = irq >> 5;
  64         if (unlikely(index >= 4))
  65                 return -EINVAL;
  66         mask = 1U << (irq & 0x1F);
  67
  68         value = __raw_readl(tzic_base + TZIC_INTSEC0(index)) | mask;
  69         if (type)
  70                 value &= ~mask;
  71         __raw_writel(value, tzic_base + TZIC_INTSEC0(index));
  72
  73         return 0;
  74 }
  75 #else
  76 #define tzic_set_irq_fiq NULL
  77 #endif
  78
  79 #ifdef CONFIG_PM
  80 static void tzic_irq_suspend(struct irq_data *d)
  81 {
  82         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
  83         int idx = d->hwirq >> 5;
  84
  85         __raw_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx));
  86 }
  87
  88 static void tzic_irq_resume(struct irq_data *d)
  89 {
  90         int idx = d->hwirq >> 5;
  91
  92         __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(idx)),
  93                      tzic_base + TZIC_WAKEUP0(idx));
  94 }
  95
  96 #else
  97 #define tzic_irq_suspend NULL
  98 #define tzic_irq_resume NULL
  99 #endif
 100
 101 static struct mxc_extra_irq tzic_extra_irq = {
 102 #ifdef CONFIG_FIQ
 103         .set_irq_fiq = tzic_set_irq_fiq,
 104 #endif
 105 };
 106
 107 static __init void tzic_init_gc(int idx, unsigned int irq_start)
 108 {
 109         struct irq_chip_generic *gc;
 110         struct irq_chip_type *ct;
 111
 112         gc = irq_alloc_generic_chip("tzic", 1, irq_start, tzic_base,
 113                                     handle_level_irq);
 114         gc->private = &tzic_extra_irq;
 115         gc->wake_enabled = IRQ_MSK(32);
 116
 117         ct = gc->chip_types;
 118         ct->chip.irq_mask = irq_gc_mask_disable_reg;
 119         ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
 120         ct->chip.irq_set_wake = irq_gc_set_wake;
 121         ct->chip.irq_suspend = tzic_irq_suspend;
 122         ct->chip.irq_resume = tzic_irq_resume;
 123         ct->regs.disable = TZIC_ENCLEAR0(idx);
 124         ct->regs.enable = TZIC_ENSET0(idx);
 125
 126         irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
 127 }
 128
 129 asmlinkage void __exception_irq_entry tzic_handle_irq(struct pt_regs *regs)
 130 {
 131         u32 stat;
 132         int i, irqofs, handled;
 133
 134         do {
 135                 handled = 0;
 136
 137                 for (i = 0; i < 4; i++) {
 138                         stat = __raw_readl(tzic_base + TZIC_HIPND(i)) &
 139                                 __raw_readl(tzic_base + TZIC_INTSEC0(i));
 140
 141                         while (stat) {
 142                                 handled = 1;
 143                                 irqofs = fls(stat) - 1;
 144                                 handle_IRQ(irq_find_mapping(domain,
 145                                                 irqofs + i * 32), regs);
 146                                 stat &= ~(1 << irqofs);
 147                         }
 148                 }
 149         } while (handled);
 150 }
 151
 152 /*
 153  * This function initializes the TZIC hardware and disables all the
 154  * interrupts. It registers the interrupt enable and disable functions
 155  * to the kernel for each interrupt source.
 156  */
 157 void __init tzic_init_irq(void __iomem *irqbase)
 158 {
 159         struct device_node *np;
 160         int irq_base;
 161         int i;
 162
 163         tzic_base = irqbase;
 164         /* put the TZIC into the reset value with
 165          * all interrupts disabled
 166          */
 167         i = __raw_readl(tzic_base + TZIC_INTCNTL);
 168
 169         __raw_writel(0x80010001, tzic_base + TZIC_INTCNTL);
 170         __raw_writel(0x1f, tzic_base + TZIC_PRIOMASK);
 171         __raw_writel(0x02, tzic_base + TZIC_SYNCCTRL);
 172
 173         for (i = 0; i < 4; i++)
 174                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i));
 175
 176         /* disable all interrupts */
 177         for (i = 0; i < 4; i++)
 178                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i));
 179
 180         /* all IRQ no FIQ Warning :: No selection */
 181
 182         irq_base = irq_alloc_descs(-1, 0, TZIC_NUM_IRQS, numa_node_id());
 183         WARN_ON(irq_base < 0);
 184
 185         np = of_find_compatible_node(NULL, NULL, "fsl,tzic");
 186         domain = irq_domain_add_legacy(np, TZIC_NUM_IRQS, irq_base, 0,
 187                                        &irq_domain_simple_ops, NULL);
 188         WARN_ON(!domain);
 189
 190         for (i = 0; i < 4; i++, irq_base += 32)
 191                 tzic_init_gc(i, irq_base);
 192
 193 #ifdef CONFIG_FIQ
 194         /* Initialize FIQ */
 195         init_FIQ(FIQ_START);
 196 #endif
 197
 198         pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
 199 }
 200
 201 /**
 202  * tzic_enable_wake() - enable wakeup interrupt
 203  *
 204  * @return                      0 if successful; non-zero otherwise
 205  *
 206  * This function provides an interrupt synchronization point that is required
 207  * by tzic enabled platforms before entering imx specific low power modes (ie,
 208  * those low power modes beyond the WAIT_CLOCKED basic ARM WFI only mode).
 209  */
 210 int tzic_enable_wake(void)
 211 {
 212         unsigned int i;
 213
 214         __raw_writel(1, tzic_base + TZIC_DSMINT);
 215         if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0))
 216                 return -EAGAIN;
 217
 218         for (i = 0; i < 4; i++)
 219                 __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(i)),
 220                              tzic_base + TZIC_WAKEUP0(i));
 221
 222         return 0;
 223 }