tzic.c revision 266152 
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: stable/10/sys/arm/freescale/imx/tzic.c 266152 2014-05-15 16:11:06Z ian $");
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
55struct 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
62static struct resource_spec tzic_spec[] = {
63	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
64	{ -1, 0 }
65};
66
67static 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
74static void tzic_post_filter(void *);
75
76static int
77tzic_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
90static int
91tzic_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
133static device_method_t tzic_methods[] = {
134	DEVMETHOD(device_probe,		tzic_probe),
135	DEVMETHOD(device_attach,	tzic_attach),
136	{ 0, 0 }
137};
138
139static driver_t tzic_driver = {
140	"tzic",
141	tzic_methods,
142	sizeof(struct tzic_softc),
143};
144
145static 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 nexus also.
150 */
151EARLY_DRIVER_MODULE(tzic, nexus, tzic_driver, tzic_devclass, 0, 0,
152    BUS_PASS_INTERRUPT);
153EARLY_DRIVER_MODULE(tzic, simplebus, tzic_driver, tzic_devclass, 0, 0,
154    BUS_PASS_INTERRUPT);
155
156static void
157tzic_post_filter(void *arg)
158{
159
160}
161
162int
163arm_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
179void
180arm_mask_irq(uintptr_t nb)
181{
182
183	tzic_write_4(TZIC_ENCLEAR(nb / 32), (1UL <<(nb % 32)));
184}
185
186void
187arm_unmask_irq(uintptr_t nb)
188{
189
190	tzic_write_4(TZIC_ENSET(nb / 32), (1UL <<(nb % 32)));
191}
192