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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 | ||
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> | |
f3eac29d SG |
18 | #include <linux/irqdomain.h> |
19 | #include <linux/of.h> | |
a003708a AK |
20 | |
21 | #include <asm/mach/irq.h> | |
98de0cbb | 22 | #include <asm/exception.h> |
a003708a AK |
23 | |
24 | #include <mach/hardware.h> | |
e24798e6 | 25 | #include <mach/common.h> |
52c2ebd7 | 26 | #include <mach/irqs.h> |
a003708a | 27 | |
cdc3f106 PH |
28 | #include "irq-common.h" |
29 | ||
a003708a AK |
30 | /* |
31 | ***************************************** | |
32 | * TZIC Registers * | |
33 | ***************************************** | |
34 | */ | |
35 | ||
36 | #define TZIC_INTCNTL 0x0000 /* Control register */ | |
37 | #define TZIC_INTTYPE 0x0004 /* Controller Type register */ | |
38 | #define TZIC_IMPID 0x0008 /* Distributor Implementer Identification */ | |
39 | #define TZIC_PRIOMASK 0x000C /* Priority Mask Reg */ | |
40 | #define TZIC_SYNCCTRL 0x0010 /* Synchronizer Control register */ | |
41 | #define TZIC_DSMINT 0x0014 /* DSM interrupt Holdoffregister */ | |
42 | #define TZIC_INTSEC0(i) (0x0080 + ((i) << 2)) /* Interrupt Security Reg 0 */ | |
43 | #define TZIC_ENSET0(i) (0x0100 + ((i) << 2)) /* Enable Set Reg 0 */ | |
44 | #define TZIC_ENCLEAR0(i) (0x0180 + ((i) << 2)) /* Enable Clear Reg 0 */ | |
45 | #define TZIC_SRCSET0 0x0200 /* Source Set Register 0 */ | |
46 | #define TZIC_SRCCLAR0 0x0280 /* Source Clear Register 0 */ | |
47 | #define TZIC_PRIORITY0 0x0400 /* Priority Register 0 */ | |
48 | #define TZIC_PND0 0x0D00 /* Pending Register 0 */ | |
58a92600 | 49 | #define TZIC_HIPND(i) (0x0D80+ ((i) << 2)) /* High Priority Pending Register */ |
a003708a AK |
50 | #define TZIC_WAKEUP0(i) (0x0E00 + ((i) << 2)) /* Wakeup Config Register */ |
51 | #define TZIC_SWINT 0x0F00 /* Software Interrupt Rigger Register */ | |
52 | #define TZIC_ID0 0x0FD0 /* Indentification Register 0 */ | |
53 | ||
54 | void __iomem *tzic_base; /* Used as irq controller base in entry-macro.S */ | |
f3eac29d | 55 | static struct irq_domain *domain; |
a003708a | 56 | |
fe31ad41 SH |
57 | #define TZIC_NUM_IRQS 128 |
58 | ||
cdc3f106 PH |
59 | #ifdef CONFIG_FIQ |
60 | static int tzic_set_irq_fiq(unsigned int irq, unsigned int type) | |
61 | { | |
62 | unsigned int index, mask, value; | |
63 | ||
64 | index = irq >> 5; | |
65 | if (unlikely(index >= 4)) | |
66 | return -EINVAL; | |
67 | mask = 1U << (irq & 0x1F); | |
68 | ||
69 | value = __raw_readl(tzic_base + TZIC_INTSEC0(index)) | mask; | |
70 | if (type) | |
71 | value &= ~mask; | |
72 | __raw_writel(value, tzic_base + TZIC_INTSEC0(index)); | |
73 | ||
74 | return 0; | |
75 | } | |
8b6c44f1 SG |
76 | #else |
77 | #define tzic_set_irq_fiq NULL | |
cdc3f106 PH |
78 | #endif |
79 | ||
010dc8af HW |
80 | #ifdef CONFIG_PM |
81 | static void tzic_irq_suspend(struct irq_data *d) | |
82 | { | |
83 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
f3eac29d | 84 | int idx = d->hwirq >> 5; |
010dc8af HW |
85 | |
86 | __raw_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx)); | |
87 | } | |
88 | ||
89 | static void tzic_irq_resume(struct irq_data *d) | |
90 | { | |
f3eac29d | 91 | int idx = d->hwirq >> 5; |
010dc8af HW |
92 | |
93 | __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(idx)), | |
94 | tzic_base + TZIC_WAKEUP0(idx)); | |
95 | } | |
96 | ||
97 | #else | |
98 | #define tzic_irq_suspend NULL | |
99 | #define tzic_irq_resume NULL | |
100 | #endif | |
a003708a | 101 | |
3439a397 HW |
102 | static struct mxc_extra_irq tzic_extra_irq = { |
103 | #ifdef CONFIG_FIQ | |
104 | .set_irq_fiq = tzic_set_irq_fiq, | |
105 | #endif | |
106 | }; | |
107 | ||
f3eac29d | 108 | static __init void tzic_init_gc(int idx, unsigned int irq_start) |
a003708a | 109 | { |
8b6c44f1 SG |
110 | struct irq_chip_generic *gc; |
111 | struct irq_chip_type *ct; | |
8b6c44f1 SG |
112 | |
113 | gc = irq_alloc_generic_chip("tzic", 1, irq_start, tzic_base, | |
114 | handle_level_irq); | |
3439a397 | 115 | gc->private = &tzic_extra_irq; |
8b6c44f1 | 116 | gc->wake_enabled = IRQ_MSK(32); |
8b6c44f1 SG |
117 | |
118 | ct = gc->chip_types; | |
119 | ct->chip.irq_mask = irq_gc_mask_disable_reg; | |
120 | ct->chip.irq_unmask = irq_gc_unmask_enable_reg; | |
121 | ct->chip.irq_set_wake = irq_gc_set_wake; | |
010dc8af HW |
122 | ct->chip.irq_suspend = tzic_irq_suspend; |
123 | ct->chip.irq_resume = tzic_irq_resume; | |
8b6c44f1 SG |
124 | ct->regs.disable = TZIC_ENCLEAR0(idx); |
125 | ct->regs.enable = TZIC_ENSET0(idx); | |
126 | ||
127 | irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0); | |
a003708a AK |
128 | } |
129 | ||
58a92600 SH |
130 | asmlinkage void __exception_irq_entry tzic_handle_irq(struct pt_regs *regs) |
131 | { | |
132 | u32 stat; | |
133 | int i, irqofs, handled; | |
134 | ||
135 | do { | |
136 | handled = 0; | |
137 | ||
138 | for (i = 0; i < 4; i++) { | |
139 | stat = __raw_readl(tzic_base + TZIC_HIPND(i)) & | |
140 | __raw_readl(tzic_base + TZIC_INTSEC0(i)); | |
141 | ||
142 | while (stat) { | |
143 | handled = 1; | |
144 | irqofs = fls(stat) - 1; | |
f3eac29d SG |
145 | handle_IRQ(irq_find_mapping(domain, |
146 | irqofs + i * 32), regs); | |
58a92600 SH |
147 | stat &= ~(1 << irqofs); |
148 | } | |
149 | } | |
150 | } while (handled); | |
151 | } | |
152 | ||
a003708a AK |
153 | /* |
154 | * This function initializes the TZIC hardware and disables all the | |
155 | * interrupts. It registers the interrupt enable and disable functions | |
156 | * to the kernel for each interrupt source. | |
157 | */ | |
158 | void __init tzic_init_irq(void __iomem *irqbase) | |
159 | { | |
f3eac29d SG |
160 | struct device_node *np; |
161 | int irq_base; | |
a003708a AK |
162 | int i; |
163 | ||
164 | tzic_base = irqbase; | |
165 | /* put the TZIC into the reset value with | |
166 | * all interrupts disabled | |
167 | */ | |
168 | i = __raw_readl(tzic_base + TZIC_INTCNTL); | |
169 | ||
170 | __raw_writel(0x80010001, tzic_base + TZIC_INTCNTL); | |
171 | __raw_writel(0x1f, tzic_base + TZIC_PRIOMASK); | |
172 | __raw_writel(0x02, tzic_base + TZIC_SYNCCTRL); | |
173 | ||
174 | for (i = 0; i < 4; i++) | |
175 | __raw_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i)); | |
176 | ||
177 | /* disable all interrupts */ | |
178 | for (i = 0; i < 4; i++) | |
179 | __raw_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i)); | |
180 | ||
181 | /* all IRQ no FIQ Warning :: No selection */ | |
182 | ||
f3eac29d SG |
183 | irq_base = irq_alloc_descs(-1, 0, TZIC_NUM_IRQS, numa_node_id()); |
184 | WARN_ON(irq_base < 0); | |
185 | ||
186 | np = of_find_compatible_node(NULL, NULL, "fsl,tzic"); | |
187 | domain = irq_domain_add_legacy(np, TZIC_NUM_IRQS, irq_base, 0, | |
188 | &irq_domain_simple_ops, NULL); | |
189 | WARN_ON(!domain); | |
190 | ||
191 | for (i = 0; i < 4; i++, irq_base += 32) | |
192 | tzic_init_gc(i, irq_base); | |
cdc3f106 PH |
193 | |
194 | #ifdef CONFIG_FIQ | |
195 | /* Initialize FIQ */ | |
bc89663a | 196 | init_FIQ(FIQ_START); |
cdc3f106 PH |
197 | #endif |
198 | ||
a003708a AK |
199 | pr_info("TrustZone Interrupt Controller (TZIC) initialized\n"); |
200 | } | |
201 | ||
202 | /** | |
203 | * tzic_enable_wake() - enable wakeup interrupt | |
204 | * | |
a003708a | 205 | * @return 0 if successful; non-zero otherwise |
eee4f400 RL |
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). | |
a003708a | 210 | */ |
010dc8af | 211 | int tzic_enable_wake(void) |
a003708a | 212 | { |
010dc8af | 213 | unsigned int i; |
a003708a AK |
214 | |
215 | __raw_writel(1, tzic_base + TZIC_DSMINT); | |
216 | if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0)) | |
217 | return -EAGAIN; | |
218 | ||
010dc8af HW |
219 | for (i = 0; i < 4; i++) |
220 | __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(i)), | |
221 | tzic_base + TZIC_WAKEUP0(i)); | |
a003708a AK |
222 | |
223 | return 0; | |
224 | } |