tegra_lic.c revision 1.2 
1/* $NetBSD: tegra_lic.c,v 1.2 2015/12/16 19:46:55 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: tegra_lic.c,v 1.2 2015/12/16 19:46:55 jmcneill Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/intr.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/kmem.h>
39
40#include <arm/nvidia/tegra_reg.h>
41#include <arm/nvidia/tegra_var.h>
42
43#include <arm/cortex/gic_intr.h>
44
45#include <dev/fdt/fdtvar.h>
46
47static int	tegra_lic_match(device_t, cfdata_t, void *);
48static void	tegra_lic_attach(device_t, device_t, void *);
49
50static void *	tegra_lic_establish(device_t, int, u_int, int, int,
51		    int (*)(void *), void *);
52static void	tegra_lic_disestablish(device_t, void *);
53static bool	tegra_lic_intrstr(device_t, int, u_int, char *, size_t);
54
55struct fdtbus_interrupt_controller_func tegra_lic_funcs = {
56	.establish = tegra_lic_establish,
57	.disestablish = tegra_lic_disestablish,
58	.intrstr = tegra_lic_intrstr
59};
60
61struct tegra_lic_softc {
62	device_t		sc_dev;
63	int			sc_phandle;
64};
65
66CFATTACH_DECL_NEW(tegra_lic, sizeof(struct tegra_lic_softc),
67	tegra_lic_match, tegra_lic_attach, NULL, NULL);
68
69static int
70tegra_lic_match(device_t parent, cfdata_t cf, void *aux)
71{
72	const char * const compatible[] = { "nvidia,tegra124-ictlr", NULL };
73	struct fdt_attach_args * const faa = aux;
74
75	return of_match_compatible(faa->faa_phandle, compatible);
76}
77
78static void
79tegra_lic_attach(device_t parent, device_t self, void *aux)
80{
81	struct tegra_lic_softc * const sc = device_private(self);
82	struct fdt_attach_args * const faa = aux;
83	int error;
84
85	sc->sc_dev = self;
86	sc->sc_phandle = faa->faa_phandle;
87
88	error = fdtbus_register_interrupt_controller(self, faa->faa_phandle,
89	    &tegra_lic_funcs);
90	if (error) {
91		aprint_error(": couldn't register with fdtbus: %d\n", error);
92		return;
93	}
94
95	aprint_naive("\n");
96	aprint_normal(": LIC\n");
97}
98
99static void *
100tegra_lic_establish(device_t dev, int phandle, u_int index, int ipl, int flags,
101    int (*func)(void *), void *arg)
102{
103	struct tegra_lic_softc * const sc = device_private(dev);
104	int iflags = (flags & FDT_INTR_MPSAFE) ? IST_MPSAFE : 0;
105	u_int *interrupts;
106	int interrupt_cells, len;
107
108	if (of_getprop_uint32(sc->sc_phandle, "#interrupt-cells",
109	    &interrupt_cells)) {
110		return NULL;
111	}
112
113	len = OF_getproplen(phandle, "interrupts");
114	if (len <= 0)
115		return NULL;
116
117	const u_int clen = interrupt_cells * 4;
118	const u_int nintr = len / interrupt_cells;
119
120	if (index >= nintr)
121		return NULL;
122
123	interrupts = kmem_alloc(len, KM_SLEEP);
124
125	if (OF_getprop(phandle, "interrupts", interrupts, len) != len) {
126		kmem_free(interrupts, len);
127		return NULL;
128	}
129
130	/* 1st cell is the interrupt type; 0 is SPI, 1 is PPI */
131	/* 2nd cell is the interrupt number */
132	/* 3rd cell is flags */
133
134	const u_int type = be32toh(interrupts[index * clen + 0]);
135	const u_int intr = be32toh(interrupts[index * clen + 1]);
136	const u_int irq = type == 0 ? IRQ_SPI(intr) : IRQ_PPI(intr);
137	const u_int trig = be32toh(interrupts[index * clen + 2]) & 0xf;
138	const u_int level = (trig & 0x3) ? IST_EDGE : IST_LEVEL;
139
140	kmem_free(interrupts, len);
141
142	return intr_establish(irq, ipl, level | iflags, func, arg);
143}
144
145static void
146tegra_lic_disestablish(device_t dev, void *ih)
147{
148	intr_disestablish(ih);
149}
150
151static bool
152tegra_lic_intrstr(device_t dev, int phandle, u_int index, char *buf,
153    size_t buflen)
154{
155	struct tegra_lic_softc * const sc = device_private(dev);
156	u_int *interrupts;
157	int interrupt_cells, len;
158
159	if (of_getprop_uint32(sc->sc_phandle, "#interrupt-cells",
160	    &interrupt_cells)) {
161		return false;
162	}
163
164	len = OF_getproplen(phandle, "interrupts");
165	if (len <= 0) {
166		return false;
167	}
168
169	const u_int clen = interrupt_cells * 4;
170	const u_int nintr = len / interrupt_cells;
171
172	if (index >= nintr) {
173		return false;
174	}
175
176	interrupts = kmem_alloc(len, KM_SLEEP);
177
178	if (OF_getprop(phandle, "interrupts", interrupts, len) != len) {
179		kmem_free(interrupts, len);
180		return false;
181	}
182
183	/* 1st cell is the interrupt type; 0 is SPI, 1 is PPI */
184	/* 2nd cell is the interrupt number */
185	/* 3rd cell is flags */
186
187	const u_int type = be32toh(interrupts[index * clen + 0]);
188	const u_int intr = be32toh(interrupts[index * clen + 1]);
189	const u_int irq = type == 0 ? IRQ_SPI(intr) : IRQ_PPI(intr);
190
191	kmem_free(interrupts, len);
192
193	snprintf(buf, buflen, "LIC irq %d", irq);
194
195	return true;
196}
197