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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 #include <linux/of_address.h>
21
22 #include <asm/mach/irq.h>
23 #include <asm/exception.h>
24
25 #include "common.h"
26 #include "hardware.h"
27 #include "irq-common.h"
28
29 /*
30  *****************************************
31  * TZIC Registers                        *
32  *****************************************
33  */
34
35 #define TZIC_INTCNTL    0x0000  /* Control register */
36 #define TZIC_INTTYPE    0x0004  /* Controller Type register */
37 #define TZIC_IMPID      0x0008  /* Distributor Implementer Identification */
38 #define TZIC_PRIOMASK   0x000C  /* Priority Mask Reg */
39 #define TZIC_SYNCCTRL   0x0010  /* Synchronizer Control register */
40 #define TZIC_DSMINT     0x0014  /* DSM interrupt Holdoffregister */
41 #define TZIC_INTSEC0(i) (0x0080 + ((i) << 2)) /* Interrupt Security Reg 0 */
42 #define TZIC_ENSET0(i)  (0x0100 + ((i) << 2)) /* Enable Set Reg 0 */
43 #define TZIC_ENCLEAR0(i) (0x0180 + ((i) << 2)) /* Enable Clear Reg 0 */
44 #define TZIC_SRCSET0    0x0200  /* Source Set Register 0 */
45 #define TZIC_SRCCLAR0   0x0280  /* Source Clear Register 0 */
46 #define TZIC_PRIORITY0  0x0400  /* Priority Register 0 */
47 #define TZIC_PND0       0x0D00  /* Pending Register 0 */
48 #define TZIC_HIPND(i)   (0x0D80+ ((i) << 2))    /* High Priority Pending Register */
49 #define TZIC_WAKEUP0(i) (0x0E00 + ((i) << 2))   /* Wakeup Config Register */
50 #define TZIC_SWINT      0x0F00  /* Software Interrupt Rigger Register */
51 #define TZIC_ID0        0x0FD0  /* Indentification Register 0 */
52
53 static void __iomem *tzic_base;
54 static struct irq_domain *domain;
55
56 #define TZIC_NUM_IRQS 128
57
58 #ifdef CONFIG_FIQ
59 static int tzic_set_irq_fiq(unsigned int irq, unsigned int type)
60 {
61         unsigned int index, mask, value;
62
63         index = irq >> 5;
64         if (unlikely(index >= 4))
65                 return -EINVAL;
66         mask = 1U << (irq & 0x1F);
67
68         value = imx_readl(tzic_base + TZIC_INTSEC0(index)) | mask;
69         if (type)
70                 value &= ~mask;
71         imx_writel(value, tzic_base + TZIC_INTSEC0(index));
72
73         return 0;
74 }
75 #else
76 #define tzic_set_irq_fiq NULL
77 #endif
78
79 #ifdef CONFIG_PM
80 static void tzic_irq_suspend(struct irq_data *d)
81 {
82         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
83         int idx = d->hwirq >> 5;
84
85         imx_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx));
86 }
87
88 static void tzic_irq_resume(struct irq_data *d)
89 {
90         int idx = d->hwirq >> 5;
91
92         imx_writel(imx_readl(tzic_base + TZIC_ENSET0(idx)),
93                    tzic_base + TZIC_WAKEUP0(idx));
94 }
95
96 #else
97 #define tzic_irq_suspend NULL
98 #define tzic_irq_resume NULL
99 #endif
100
101 static struct mxc_extra_irq tzic_extra_irq = {
102 #ifdef CONFIG_FIQ
103         .set_irq_fiq = tzic_set_irq_fiq,
104 #endif
105 };
106
107 static __init void tzic_init_gc(int idx, unsigned int irq_start)
108 {
109         struct irq_chip_generic *gc;
110         struct irq_chip_type *ct;
111
112         gc = irq_alloc_generic_chip("tzic", 1, irq_start, tzic_base,
113                                     handle_level_irq);
114         gc->private = &tzic_extra_irq;
115         gc->wake_enabled = IRQ_MSK(32);
116
117         ct = gc->chip_types;
118         ct->chip.irq_mask = irq_gc_mask_disable_reg;
119         ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
120         ct->chip.irq_set_wake = irq_gc_set_wake;
121         ct->chip.irq_suspend = tzic_irq_suspend;
122         ct->chip.irq_resume = tzic_irq_resume;
123         ct->regs.disable = TZIC_ENCLEAR0(idx);
124         ct->regs.enable = TZIC_ENSET0(idx);
125
126         irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
127 }
128
129 static void __exception_irq_entry tzic_handle_irq(struct pt_regs *regs)
130 {
131         u32 stat;
132         int i, irqofs, handled;
133
134         do {
135                 handled = 0;
136
137                 for (i = 0; i < 4; i++) {
138                         stat = imx_readl(tzic_base + TZIC_HIPND(i)) &
139                                 imx_readl(tzic_base + TZIC_INTSEC0(i));
140
141                         while (stat) {
142                                 handled = 1;
143                                 irqofs = fls(stat) - 1;
144                                 handle_domain_irq(domain, 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)
157 {
158         struct device_node *np;
159         int irq_base;
160         int i;
161
162         np = of_find_compatible_node(NULL, NULL, "fsl,tzic");
163         tzic_base = of_iomap(np, 0);
164         WARN_ON(!tzic_base);
165
166         /* put the TZIC into the reset value with
167          * all interrupts disabled
168          */
169         i = imx_readl(tzic_base + TZIC_INTCNTL);
170
171         imx_writel(0x80010001, tzic_base + TZIC_INTCNTL);
172         imx_writel(0x1f, tzic_base + TZIC_PRIOMASK);
173         imx_writel(0x02, tzic_base + TZIC_SYNCCTRL);
174
175         for (i = 0; i < 4; i++)
176                 imx_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i));
177
178         /* disable all interrupts */
179         for (i = 0; i < 4; i++)
180                 imx_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i));
181
182         /* all IRQ no FIQ Warning :: No selection */
183
184         irq_base = irq_alloc_descs(-1, 0, TZIC_NUM_IRQS, numa_node_id());
185         WARN_ON(irq_base < 0);
186
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);
193
194         set_handle_irq(tzic_handle_irq);
195
196 #ifdef CONFIG_FIQ
197         /* Initialize FIQ */
198         init_FIQ(FIQ_START);
199 #endif
200
201         pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
202 }
203
204 /**
205  * tzic_enable_wake() - enable wakeup interrupt
206  *
207  * @return                      0 if successful; non-zero otherwise
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).
212  */
213 int tzic_enable_wake(void)
214 {
215         unsigned int i;
216
217         imx_writel(1, tzic_base + TZIC_DSMINT);
218         if (unlikely(imx_readl(tzic_base + TZIC_DSMINT) == 0))
219                 return -EAGAIN;
220
221         for (i = 0; i < 4; i++)
222                 imx_writel(imx_readl(tzic_base + TZIC_ENSET0(i)),
223                            tzic_base + TZIC_WAKEUP0(i));
224
225         return 0;
226 }