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1 /*-
2  * Copyright (c) 2012, 2013 The FreeBSD Foundation
3  * All rights reserved.
4  *
5  * This software was developed by Oleksandr Rybalko under sponsorship
6  * from the FreeBSD Foundation.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1.   Redistributions of source code must retain the above copyright
12  *      notice, this list of conditions and the following disclaimer.
13  * 2.   Redistributions in binary form must reproduce the above copyright
14  *      notice, this list of conditions and the following disclaimer in the
15  *      documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/ktr.h>
38 #include <sys/module.h>
39 #include <sys/rman.h>
40 #include <sys/pcpu.h>
41 #include <sys/proc.h>
42 #include <sys/cpuset.h>
43 #include <sys/lock.h>
44 #include <sys/mutex.h>
45 #include <machine/bus.h>
46 #include <machine/intr.h>
47
48 #include <dev/fdt/fdt_common.h>
49 #include <dev/ofw/openfirm.h>
50 #include <dev/ofw/ofw_bus.h>
51 #include <dev/ofw/ofw_bus_subr.h>
52
53 #include <arm/freescale/imx/imx51_tzicreg.h>
54
55 struct tzic_softc {
56         struct resource *       tzic_res[3];
57         bus_space_tag_t         tzic_bst;
58         bus_space_handle_t      tzic_bsh;
59         uint8_t                 ver;
60 };
61
62 static struct resource_spec tzic_spec[] = {
63         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
64         { -1, 0 }
65 };
66
67 static struct tzic_softc *tzic_sc = NULL;
68
69 #define tzic_read_4(reg)                \
70     bus_space_read_4(tzic_sc->tzic_bst, tzic_sc->tzic_bsh, reg)
71 #define tzic_write_4(reg, val)          \
72     bus_space_write_4(tzic_sc->tzic_bst, tzic_sc->tzic_bsh, reg, val)
73
74 static void tzic_post_filter(void *);
75
76 static int
77 tzic_probe(device_t dev)
78 {
79
80         if (!ofw_bus_status_okay(dev))
81                 return (ENXIO);
82
83         if (ofw_bus_is_compatible(dev, "fsl,tzic")) {
84                 device_set_desc(dev, "TrustZone Interrupt Controller");
85                 return (BUS_PROBE_DEFAULT);
86         }
87         return (ENXIO);
88 }
89
90 static int
91 tzic_attach(device_t dev)
92 {
93         struct          tzic_softc *sc = device_get_softc(dev);
94         int             i;
95         uint32_t        reg;
96
97         if (tzic_sc)
98                 return (ENXIO);
99
100         if (bus_alloc_resources(dev, tzic_spec, sc->tzic_res)) {
101                 device_printf(dev, "could not allocate resources\n");
102                 return (ENXIO);
103         }
104
105         arm_post_filter = tzic_post_filter;
106
107         /* Distributor Interface */
108         sc->tzic_bst = rman_get_bustag(sc->tzic_res[0]);
109         sc->tzic_bsh = rman_get_bushandle(sc->tzic_res[0]);
110
111         tzic_sc = sc;
112
113         reg = tzic_read_4(TZIC_INTCNTL);
114         tzic_write_4(TZIC_INTCNTL, INTCNTL_NSEN_MASK|INTCNTL_NSEN|INTCNTL_EN);
115         reg = tzic_read_4(TZIC_INTCNTL);
116         tzic_write_4(TZIC_PRIOMASK, 0x1f);
117         reg = tzic_read_4(TZIC_PRIOMASK);
118
119         tzic_write_4(TZIC_SYNCCTRL, 0x02);
120         reg = tzic_read_4(TZIC_SYNCCTRL);
121
122         /* route all interrupts to IRQ.  secure interrupts are for FIQ */
123         for (i = 0; i < 4; i++)
124                 tzic_write_4(TZIC_INTSEC(i), 0xffffffff);
125
126         /* disable all interrupts */
127         for (i = 0; i < 4; i++)
128                 tzic_write_4(TZIC_ENCLEAR(i), 0xffffffff);
129
130         return (0);
131 }
132
133 static device_method_t tzic_methods[] = {
134         DEVMETHOD(device_probe,         tzic_probe),
135         DEVMETHOD(device_attach,        tzic_attach),
136         { 0, 0 }
137 };
138
139 static driver_t tzic_driver = {
140         "tzic",
141         tzic_methods,
142         sizeof(struct tzic_softc),
143 };
144
145 static devclass_t tzic_devclass;
146
147 /*
148  * Memory space of controller located outside of device range, so let him to
149  * attach not only to simplebus, but ofwbus also.
150  */
151 EARLY_DRIVER_MODULE(tzic, ofwbus, tzic_driver, tzic_devclass, 0, 0,
152     BUS_PASS_INTERRUPT);
153 EARLY_DRIVER_MODULE(tzic, simplebus, tzic_driver, tzic_devclass, 0, 0,
154     BUS_PASS_INTERRUPT);
155
156 static void
157 tzic_post_filter(void *arg)
158 {
159
160 }
161
162 int
163 arm_get_next_irq(int last_irq)
164 {
165         uint32_t pending;
166         int i, b;
167
168         for (i = 0; i < 4; i++) {
169                 pending = tzic_read_4(TZIC_PND(i));
170                 for (b = 0; pending != 0 && b < 32; b++)
171                         if (pending & (1 << b)) {
172                                 return (i * 32 + b);
173                         }
174         }
175
176         return (-1);
177 }
178
179 void
180 arm_mask_irq(uintptr_t nb)
181 {
182
183         tzic_write_4(TZIC_ENCLEAR(nb / 32), (1UL <<(nb % 32)));
184 }
185
186 void
187 arm_unmask_irq(uintptr_t nb)
188 {
189
190         tzic_write_4(TZIC_ENSET(nb / 32), (1UL <<(nb % 32)));
191 }