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a003708a | 1 | /* |
e24798e6 | 2 | * Copyright (C)2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. |
a003708a AK |
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 | ||
a003708a AK |
12 | #include <linux/init.h> |
13 | #include <linux/device.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/io.h> | |
ead81266 | 16 | #include <linux/irqchip.h> |
f3eac29d SG |
17 | #include <linux/irqdomain.h> |
18 | #include <linux/of.h> | |
fffa0512 | 19 | #include <linux/of_address.h> |
a003708a AK |
20 | |
21 | #include <asm/mach/irq.h> | |
98de0cbb | 22 | #include <asm/exception.h> |
a003708a | 23 | |
e3372474 | 24 | #include "common.h" |
50f2de61 | 25 | #include "hardware.h" |
cdc3f106 PH |
26 | #include "irq-common.h" |
27 | ||
a003708a AK |
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 */ | |
58a92600 | 47 | #define TZIC_HIPND(i) (0x0D80+ ((i) << 2)) /* High Priority Pending Register */ |
a003708a AK |
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 | ||
516e89d7 | 52 | static void __iomem *tzic_base; |
f3eac29d | 53 | static struct irq_domain *domain; |
a003708a | 54 | |
fe31ad41 SH |
55 | #define TZIC_NUM_IRQS 128 |
56 | ||
cdc3f106 | 57 | #ifdef CONFIG_FIQ |
d1e1c31c | 58 | static int tzic_set_irq_fiq(unsigned int hwirq, unsigned int type) |
cdc3f106 PH |
59 | { |
60 | unsigned int index, mask, value; | |
61 | ||
d1e1c31c | 62 | index = hwirq >> 5; |
cdc3f106 PH |
63 | if (unlikely(index >= 4)) |
64 | return -EINVAL; | |
d1e1c31c | 65 | mask = 1U << (hwirq & 0x1F); |
cdc3f106 | 66 | |
c553138f | 67 | value = imx_readl(tzic_base + TZIC_INTSEC0(index)) | mask; |
cdc3f106 PH |
68 | if (type) |
69 | value &= ~mask; | |
c553138f | 70 | imx_writel(value, tzic_base + TZIC_INTSEC0(index)); |
cdc3f106 PH |
71 | |
72 | return 0; | |
73 | } | |
8b6c44f1 SG |
74 | #else |
75 | #define tzic_set_irq_fiq NULL | |
cdc3f106 PH |
76 | #endif |
77 | ||
010dc8af HW |
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); | |
f3eac29d | 82 | int idx = d->hwirq >> 5; |
010dc8af | 83 | |
c553138f | 84 | imx_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx)); |
010dc8af HW |
85 | } |
86 | ||
87 | static void tzic_irq_resume(struct irq_data *d) | |
88 | { | |
f3eac29d | 89 | int idx = d->hwirq >> 5; |
010dc8af | 90 | |
c553138f JB |
91 | imx_writel(imx_readl(tzic_base + TZIC_ENSET0(idx)), |
92 | tzic_base + TZIC_WAKEUP0(idx)); | |
010dc8af HW |
93 | } |
94 | ||
95 | #else | |
96 | #define tzic_irq_suspend NULL | |
97 | #define tzic_irq_resume NULL | |
98 | #endif | |
a003708a | 99 | |
3439a397 HW |
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 | ||
f3eac29d | 106 | static __init void tzic_init_gc(int idx, unsigned int irq_start) |
a003708a | 107 | { |
8b6c44f1 SG |
108 | struct irq_chip_generic *gc; |
109 | struct irq_chip_type *ct; | |
8b6c44f1 SG |
110 | |
111 | gc = irq_alloc_generic_chip("tzic", 1, irq_start, tzic_base, | |
112 | handle_level_irq); | |
3439a397 | 113 | gc->private = &tzic_extra_irq; |
8b6c44f1 | 114 | gc->wake_enabled = IRQ_MSK(32); |
8b6c44f1 SG |
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; | |
010dc8af HW |
120 | ct->chip.irq_suspend = tzic_irq_suspend; |
121 | ct->chip.irq_resume = tzic_irq_resume; | |
8b6c44f1 SG |
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); | |
a003708a AK |
126 | } |
127 | ||
000bf9ee | 128 | static void __exception_irq_entry tzic_handle_irq(struct pt_regs *regs) |
58a92600 SH |
129 | { |
130 | u32 stat; | |
131 | int i, irqofs, handled; | |
132 | ||
133 | do { | |
134 | handled = 0; | |
135 | ||
136 | for (i = 0; i < 4; i++) { | |
c553138f JB |
137 | stat = imx_readl(tzic_base + TZIC_HIPND(i)) & |
138 | imx_readl(tzic_base + TZIC_INTSEC0(i)); | |
58a92600 SH |
139 | |
140 | while (stat) { | |
141 | handled = 1; | |
142 | irqofs = fls(stat) - 1; | |
cb221761 | 143 | handle_domain_irq(domain, irqofs + i * 32, regs); |
58a92600 SH |
144 | stat &= ~(1 << irqofs); |
145 | } | |
146 | } | |
147 | } while (handled); | |
148 | } | |
149 | ||
a003708a AK |
150 | /* |
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. | |
154 | */ | |
ead81266 | 155 | static int __init tzic_init_dt(struct device_node *np, struct device_node *p) |
a003708a | 156 | { |
f3eac29d | 157 | int irq_base; |
a003708a AK |
158 | int i; |
159 | ||
fffa0512 SG |
160 | tzic_base = of_iomap(np, 0); |
161 | WARN_ON(!tzic_base); | |
162 | ||
a003708a AK |
163 | /* put the TZIC into the reset value with |
164 | * all interrupts disabled | |
165 | */ | |
c553138f | 166 | i = imx_readl(tzic_base + TZIC_INTCNTL); |
a003708a | 167 | |
c553138f JB |
168 | imx_writel(0x80010001, tzic_base + TZIC_INTCNTL); |
169 | imx_writel(0x1f, tzic_base + TZIC_PRIOMASK); | |
170 | imx_writel(0x02, tzic_base + TZIC_SYNCCTRL); | |
a003708a AK |
171 | |
172 | for (i = 0; i < 4; i++) | |
c553138f | 173 | imx_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i)); |
a003708a AK |
174 | |
175 | /* disable all interrupts */ | |
176 | for (i = 0; i < 4; i++) | |
c553138f | 177 | imx_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i)); |
a003708a AK |
178 | |
179 | /* all IRQ no FIQ Warning :: No selection */ | |
180 | ||
f3eac29d SG |
181 | irq_base = irq_alloc_descs(-1, 0, TZIC_NUM_IRQS, numa_node_id()); |
182 | WARN_ON(irq_base < 0); | |
183 | ||
f3eac29d SG |
184 | domain = irq_domain_add_legacy(np, TZIC_NUM_IRQS, irq_base, 0, |
185 | &irq_domain_simple_ops, NULL); | |
186 | WARN_ON(!domain); | |
187 | ||
188 | for (i = 0; i < 4; i++, irq_base += 32) | |
189 | tzic_init_gc(i, irq_base); | |
cdc3f106 | 190 | |
000bf9ee AS |
191 | set_handle_irq(tzic_handle_irq); |
192 | ||
cdc3f106 PH |
193 | #ifdef CONFIG_FIQ |
194 | /* Initialize FIQ */ | |
bc89663a | 195 | init_FIQ(FIQ_START); |
cdc3f106 PH |
196 | #endif |
197 | ||
a003708a | 198 | pr_info("TrustZone Interrupt Controller (TZIC) initialized\n"); |
ead81266 AS |
199 | |
200 | return 0; | |
a003708a | 201 | } |
ead81266 | 202 | IRQCHIP_DECLARE(tzic, "fsl,tzic", tzic_init_dt); |
a003708a AK |
203 | |
204 | /** | |
205 | * tzic_enable_wake() - enable wakeup interrupt | |
206 | * | |
a003708a | 207 | * @return 0 if successful; non-zero otherwise |
eee4f400 RL |
208 | * |
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). | |
a003708a | 212 | */ |
010dc8af | 213 | int tzic_enable_wake(void) |
a003708a | 214 | { |
010dc8af | 215 | unsigned int i; |
a003708a | 216 | |
c553138f JB |
217 | imx_writel(1, tzic_base + TZIC_DSMINT); |
218 | if (unlikely(imx_readl(tzic_base + TZIC_DSMINT) == 0)) | |
a003708a AK |
219 | return -EAGAIN; |
220 | ||
010dc8af | 221 | for (i = 0; i < 4; i++) |
c553138f JB |
222 | imx_writel(imx_readl(tzic_base + TZIC_ENSET0(i)), |
223 | tzic_base + TZIC_WAKEUP0(i)); | |
a003708a AK |
224 | |
225 | return 0; | |
226 | } |