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[~andy/linux] / 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
19 #include <asm/mach/irq.h>
20 #include <asm/exception.h>
21
22 #include <mach/hardware.h>
23 #include <mach/common.h>
24
25 #include "irq-common.h"
26
27 /*
28  *****************************************
29  * TZIC Registers                        *
30  *****************************************
31  */
32
33 #define TZIC_INTCNTL    0x0000  /* Control register */
34 #define TZIC_INTTYPE    0x0004  /* Controller Type register */
35 #define TZIC_IMPID      0x0008  /* Distributor Implementer Identification */
36 #define TZIC_PRIOMASK   0x000C  /* Priority Mask Reg */
37 #define TZIC_SYNCCTRL   0x0010  /* Synchronizer Control register */
38 #define TZIC_DSMINT     0x0014  /* DSM interrupt Holdoffregister */
39 #define TZIC_INTSEC0(i) (0x0080 + ((i) << 2)) /* Interrupt Security Reg 0 */
40 #define TZIC_ENSET0(i)  (0x0100 + ((i) << 2)) /* Enable Set Reg 0 */
41 #define TZIC_ENCLEAR0(i) (0x0180 + ((i) << 2)) /* Enable Clear Reg 0 */
42 #define TZIC_SRCSET0    0x0200  /* Source Set Register 0 */
43 #define TZIC_SRCCLAR0   0x0280  /* Source Clear Register 0 */
44 #define TZIC_PRIORITY0  0x0400  /* Priority Register 0 */
45 #define TZIC_PND0       0x0D00  /* Pending Register 0 */
46 #define TZIC_HIPND(i)   (0x0D80+ ((i) << 2))    /* High Priority Pending Register */
47 #define TZIC_WAKEUP0(i) (0x0E00 + ((i) << 2))   /* Wakeup Config Register */
48 #define TZIC_SWINT      0x0F00  /* Software Interrupt Rigger Register */
49 #define TZIC_ID0        0x0FD0  /* Indentification Register 0 */
50
51 void __iomem *tzic_base; /* Used as irq controller base in entry-macro.S */
52
53 #define TZIC_NUM_IRQS 128
54
55 #ifdef CONFIG_FIQ
56 static int tzic_set_irq_fiq(unsigned int irq, unsigned int type)
57 {
58         unsigned int index, mask, value;
59
60         index = irq >> 5;
61         if (unlikely(index >= 4))
62                 return -EINVAL;
63         mask = 1U << (irq & 0x1F);
64
65         value = __raw_readl(tzic_base + TZIC_INTSEC0(index)) | mask;
66         if (type)
67                 value &= ~mask;
68         __raw_writel(value, tzic_base + TZIC_INTSEC0(index));
69
70         return 0;
71 }
72 #else
73 #define tzic_set_irq_fiq NULL
74 #endif
75
76 #ifdef CONFIG_PM
77 static void tzic_irq_suspend(struct irq_data *d)
78 {
79         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
80         int idx = gc->irq_base >> 5;
81
82         __raw_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx));
83 }
84
85 static void tzic_irq_resume(struct irq_data *d)
86 {
87         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
88         int idx = gc->irq_base >> 5;
89
90         __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(idx)),
91                      tzic_base + TZIC_WAKEUP0(idx));
92 }
93
94 #else
95 #define tzic_irq_suspend NULL
96 #define tzic_irq_resume NULL
97 #endif
98
99 static struct mxc_extra_irq tzic_extra_irq = {
100 #ifdef CONFIG_FIQ
101         .set_irq_fiq = tzic_set_irq_fiq,
102 #endif
103 };
104
105 static __init void tzic_init_gc(unsigned int irq_start)
106 {
107         struct irq_chip_generic *gc;
108         struct irq_chip_type *ct;
109         int idx = irq_start >> 5;
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 asmlinkage 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(irqofs + i * 32, regs);
144                                 stat &= ~(1 << irqofs);
145                         }
146                 }
147         } while (handled);
148 }
149
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  */
155 void __init tzic_init_irq(void __iomem *irqbase)
156 {
157         int i;
158
159         tzic_base = irqbase;
160         /* put the TZIC into the reset value with
161          * all interrupts disabled
162          */
163         i = __raw_readl(tzic_base + TZIC_INTCNTL);
164
165         __raw_writel(0x80010001, tzic_base + TZIC_INTCNTL);
166         __raw_writel(0x1f, tzic_base + TZIC_PRIOMASK);
167         __raw_writel(0x02, tzic_base + TZIC_SYNCCTRL);
168
169         for (i = 0; i < 4; i++)
170                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i));
171
172         /* disable all interrupts */
173         for (i = 0; i < 4; i++)
174                 __raw_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i));
175
176         /* all IRQ no FIQ Warning :: No selection */
177
178         for (i = 0; i < TZIC_NUM_IRQS; i += 32)
179                 tzic_init_gc(i);
180
181 #ifdef CONFIG_FIQ
182         /* Initialize FIQ */
183         init_FIQ();
184 #endif
185
186         pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
187 }
188
189 /**
190  * tzic_enable_wake() - enable wakeup interrupt
191  *
192  * @return                      0 if successful; non-zero otherwise
193  */
194 int tzic_enable_wake(void)
195 {
196         unsigned int i;
197
198         __raw_writel(1, tzic_base + TZIC_DSMINT);
199         if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0))
200                 return -EAGAIN;
201
202         for (i = 0; i < 4; i++)
203                 __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(i)),
204                              tzic_base + TZIC_WAKEUP0(i));
205
206         return 0;
207 }