2 * Copyright (C)2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
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:
8 * http://www.opensource.org/licenses/gpl-license.html
9 * http://www.gnu.org/copyleft/gpl.html
12 #include <linux/init.h>
13 #include <linux/device.h>
14 #include <linux/errno.h>
16 #include <linux/irqchip.h>
17 #include <linux/irqdomain.h>
19 #include <linux/of_address.h>
21 #include <asm/mach/irq.h>
22 #include <asm/exception.h>
26 #include "irq-common.h"
29 *****************************************
31 *****************************************
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 */
52 static void __iomem *tzic_base;
53 static struct irq_domain *domain;
55 #define TZIC_NUM_IRQS 128
58 static int tzic_set_irq_fiq(unsigned int hwirq, unsigned int type)
60 unsigned int index, mask, value;
63 if (unlikely(index >= 4))
65 mask = 1U << (hwirq & 0x1F);
67 value = imx_readl(tzic_base + TZIC_INTSEC0(index)) | mask;
70 imx_writel(value, tzic_base + TZIC_INTSEC0(index));
75 #define tzic_set_irq_fiq NULL
79 static void tzic_irq_suspend(struct irq_data *d)
81 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
82 int idx = d->hwirq >> 5;
84 imx_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx));
87 static void tzic_irq_resume(struct irq_data *d)
89 int idx = d->hwirq >> 5;
91 imx_writel(imx_readl(tzic_base + TZIC_ENSET0(idx)),
92 tzic_base + TZIC_WAKEUP0(idx));
96 #define tzic_irq_suspend NULL
97 #define tzic_irq_resume NULL
100 static struct mxc_extra_irq tzic_extra_irq = {
102 .set_irq_fiq = tzic_set_irq_fiq,
106 static __init void tzic_init_gc(int idx, unsigned int irq_start)
108 struct irq_chip_generic *gc;
109 struct irq_chip_type *ct;
111 gc = irq_alloc_generic_chip("tzic", 1, irq_start, tzic_base,
113 gc->private = &tzic_extra_irq;
114 gc->wake_enabled = IRQ_MSK(32);
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);
125 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
128 static void __exception_irq_entry tzic_handle_irq(struct pt_regs *regs)
131 int i, irqofs, handled;
136 for (i = 0; i < 4; i++) {
137 stat = imx_readl(tzic_base + TZIC_HIPND(i)) &
138 imx_readl(tzic_base + TZIC_INTSEC0(i));
142 irqofs = fls(stat) - 1;
143 handle_domain_irq(domain, irqofs + i * 32, regs);
144 stat &= ~(1 << irqofs);
151 * This function initializes the TZIC hardware and disables all the
152 * interrupts. It registers the interrupt enable and disable functions
153 * to the kernel for each interrupt source.
155 static int __init tzic_init_dt(struct device_node *np, struct device_node *p)
160 tzic_base = of_iomap(np, 0);
163 /* put the TZIC into the reset value with
164 * all interrupts disabled
166 i = imx_readl(tzic_base + TZIC_INTCNTL);
168 imx_writel(0x80010001, tzic_base + TZIC_INTCNTL);
169 imx_writel(0x1f, tzic_base + TZIC_PRIOMASK);
170 imx_writel(0x02, tzic_base + TZIC_SYNCCTRL);
172 for (i = 0; i < 4; i++)
173 imx_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i));
175 /* disable all interrupts */
176 for (i = 0; i < 4; i++)
177 imx_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i));
179 /* all IRQ no FIQ Warning :: No selection */
181 irq_base = irq_alloc_descs(-1, 0, TZIC_NUM_IRQS, numa_node_id());
182 WARN_ON(irq_base < 0);
184 domain = irq_domain_add_legacy(np, TZIC_NUM_IRQS, irq_base, 0,
185 &irq_domain_simple_ops, NULL);
188 for (i = 0; i < 4; i++, irq_base += 32)
189 tzic_init_gc(i, irq_base);
191 set_handle_irq(tzic_handle_irq);
198 pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
202 IRQCHIP_DECLARE(tzic, "fsl,tzic", tzic_init_dt);
205 * tzic_enable_wake() - enable wakeup interrupt
207 * @return 0 if successful; non-zero otherwise
209 * This function provides an interrupt synchronization point that is required
210 * by tzic enabled platforms before entering imx specific low power modes (ie,
211 * those low power modes beyond the WAIT_CLOCKED basic ARM WFI only mode).
213 int tzic_enable_wake(void)
217 imx_writel(1, tzic_base + TZIC_DSMINT);
218 if (unlikely(imx_readl(tzic_base + TZIC_DSMINT) == 0))
221 for (i = 0; i < 4; i++)
222 imx_writel(imx_readl(tzic_base + TZIC_ENSET0(i)),
223 tzic_base + TZIC_WAKEUP0(i));