arch/arm/mach-imx/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 "common.h"
  25 #include "hardware.h"
  26 #include "irq-common.h"
  27
  28 /*
  29  *****************************************
  30  * TZIC Registers                        *
  31  *****************************************
  32  */
  33
  34 #define TZIC_INTCNTL    0x0000  /* Control register */
  35 #define TZIC_INTTYPE    0x0004  /* Controller Type register */
  36 #define TZIC_IMPID      0x0008  /* Distributor Implementer Identification */
  37 #define TZIC_PRIOMASK   0x000C  /* Priority Mask Reg */
  38 #define TZIC_SYNCCTRL   0x0010  /* Synchronizer Control register */
  39 #define TZIC_DSMINT     0x0014  /* DSM interrupt Holdoffregister */
  40 #define TZIC_INTSEC0(i) (0x0080 + ((i) << 2)) /* Interrupt Security Reg 0 */
  41 #define TZIC_ENSET0(i)  (0x0100 + ((i) << 2)) /* Enable Set Reg 0 */
  42 #define TZIC_ENCLEAR0(i) (0x0180 + ((i) << 2)) /* Enable Clear Reg 0 */
  43 #define TZIC_SRCSET0    0x0200  /* Source Set Register 0 */
  44 #define TZIC_SRCCLAR0   0x0280  /* Source Clear Register 0 */
  45 #define TZIC_PRIORITY0  0x0400  /* Priority Register 0 */
  46 #define TZIC_PND0       0x0D00  /* Pending Register 0 */
  47 #define TZIC_HIPND(i)   (0x0D80+ ((i) << 2))    /* High Priority Pending Register */
  48 #define TZIC_WAKEUP0(i) (0x0E00 + ((i) << 2))   /* Wakeup Config Register */
  49 #define TZIC_SWINT      0x0F00  /* Software Interrupt Rigger Register */
  50 #define TZIC_ID0        0x0FD0  /* Indentification Register 0 */
  51
  52 static void __iomem *tzic_base;
  53 static struct irq_domain *domain;
  54
  55 #define TZIC_NUM_IRQS 128
  56
  57 #ifdef CONFIG_FIQ
  58 static int tzic_set_irq_fiq(unsigned int irq, unsigned int type)
  59 {
  60         unsigned int index, mask, value;
  61
  62         index = irq >> 5;
  63         if (unlikely(index >= 4))
  64                 return -EINVAL;
  65         mask = 1U << (irq & 0x1F);
  66
  67         value = __raw_readl(tzic_base + TZIC_INTSEC0(index)) | mask;
  68         if (type)
  69                 value &= ~mask;
  70         __raw_writel(value, tzic_base + TZIC_INTSEC0(index));
  71
  72         return 0;
  73 }
  74 #else
  75 #define tzic_set_irq_fiq NULL
  76 #endif
  77
  78 #ifdef CONFIG_PM
  79 static void tzic_irq_suspend(struct irq_data *d)
  80 {
  81         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
  82         int idx = d->hwirq >> 5;
  83
  84         __raw_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx));
  85 }
  86
  87 static void tzic_irq_resume(struct irq_data *d)
  88 {
  89         int idx = d->hwirq >> 5;
  90
  91         __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(idx)),
  92                      tzic_base + TZIC_WAKEUP0(idx));
  93 }
  94
  95 #else
  96 #define tzic_irq_suspend NULL
  97 #define tzic_irq_resume NULL
  98 #endif
  99
 100 static struct mxc_extra_irq tzic_extra_irq = {
 101 #ifdef CONFIG_FIQ
 102         .set_irq_fiq = tzic_set_irq_fiq,
 103 #endif
 104 };
 105
 106 static __init void tzic_init_gc(int idx, unsigned int irq_start)
 107 {
 108         struct irq_chip_generic *gc;
 109         struct irq_chip_type *ct;
 110
 111         gc = irq_alloc_generic_chip("tzic", 1, irq_start, tzic_base,
 112                                     handle_level_irq);
 113         gc->private = &tzic_extra_irq;
 114         gc->wake_enabled = IRQ_MSK(32);
 115
 116         ct = gc->chip_types;
 117         ct->chip.irq_mask = irq_gc_mask_disable_reg;
 118         ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
 119         ct->chip.irq_set_wake = irq_gc_set_wake;
 120         ct->chip.irq_suspend = tzic_irq_suspend;
 121         ct->chip.irq_resume = tzic_irq_resume;
 122         ct->regs.disable = TZIC_ENCLEAR0(idx);
 123         ct->regs.enable = TZIC_ENSET0(idx);
 124
 125         irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
 126 }
 127
 128 static void __exception_irq_entry tzic_handle_irq(struct pt_regs *regs)
 129 {
 130         u32 stat;
 131         int i, irqofs, handled;
 132
 133         do {
 134                 handled = 0;
 135
 136                 for (i = 0; i < 4; i++) {
 137                         stat = __raw_readl(tzic_base + TZIC_HIPND(i)) &
 138                                 __raw_readl(tzic_base + TZIC_INTSEC0(i));
 139
 140                         while (stat) {
 141                                 handled = 1;
 142                                 irqofs = fls(stat) - 1;
 143                                 handle_IRQ(irq_find_mapping(domain,
 144                                                 irqofs + i * 32), regs);
 145                                 stat &= ~(1 << irqofs);
 146                         }
 147                 }
 148         } while (handled);
 149 }
 150
 151 /*
 152  * This function initializes the TZIC hardware and disables all the
 153  * interrupts. It registers the interrupt enable and disable functions
 154  * to the kernel for each interrupt source.
 155  */
 156 void __init tzic_init_irq(void __iomem *irqbase)
 157 {
 158         struct device_node *np;
 159         int irq_base;
 160         int i;
 161
 162         tzic_base = irqbase;
 163         /* put the TZIC into the reset value with
 164          * all interrupts disabled
 165          */
 166         i = __raw_readl(tzic_base + TZIC_INTCNTL);
 167
 168         __raw_writel(0x80010001, tzic_base + TZIC_INTCNTL);
 169         __raw_writel(0x1f, tzic_base + TZIC_PRIOMASK);
 170         __raw_writel(0x02, tzic_base + TZIC_SYNCCTRL);
 171
 172         for (i = 0; i < 4; i++)
 173                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i));
 174
 175         /* disable all interrupts */
 176         for (i = 0; i < 4; i++)
 177                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i));
 178
 179         /* all IRQ no FIQ Warning :: No selection */
 180
 181         irq_base = irq_alloc_descs(-1, 0, TZIC_NUM_IRQS, numa_node_id());
 182         WARN_ON(irq_base < 0);
 183
 184         np = of_find_compatible_node(NULL, NULL, "fsl,tzic");
 185         domain = irq_domain_add_legacy(np, TZIC_NUM_IRQS, irq_base, 0,
 186                                        &irq_domain_simple_ops, NULL);
 187         WARN_ON(!domain);
 188
 189         for (i = 0; i < 4; i++, irq_base += 32)
 190                 tzic_init_gc(i, irq_base);
 191
 192         set_handle_irq(tzic_handle_irq);
 193
 194 #ifdef CONFIG_FIQ
 195         /* Initialize FIQ */
 196         init_FIQ(FIQ_START);
 197 #endif
 198
 199         pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
 200 }
 201
 202 /**
 203  * tzic_enable_wake() - enable wakeup interrupt
 204  *
 205  * @return                      0 if successful; non-zero otherwise
 206  *
 207  * This function provides an interrupt synchronization point that is required
 208  * by tzic enabled platforms before entering imx specific low power modes (ie,
 209  * those low power modes beyond the WAIT_CLOCKED basic ARM WFI only mode).
 210  */
 211 int tzic_enable_wake(void)
 212 {
 213         unsigned int i;
 214
 215         __raw_writel(1, tzic_base + TZIC_DSMINT);
 216         if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0))
 217                 return -EAGAIN;
 218
 219         for (i = 0; i < 4; i++)
 220                 __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(i)),
 221                              tzic_base + TZIC_WAKEUP0(i));
 222
 223         return 0;
 224 }