spibus.c revision 257064 
1#include <sys/cdefs.h>
2__FBSDID("$FreeBSD: head/sys/dev/spibus/spibus.c 257064 2013-10-24 16:56:38Z loos $");
3
4#include <sys/param.h>
5#include <sys/systm.h>
6#include <sys/malloc.h>
7#include <sys/module.h>
8#include <sys/kernel.h>
9#include <sys/queue.h>
10#include <sys/sysctl.h>
11#include <sys/types.h>
12
13#include <sys/bus.h>
14#include <machine/bus.h>
15#include <sys/rman.h>
16#include <machine/resource.h>
17
18#include <dev/spibus/spibusvar.h>
19#include <dev/spibus/spi.h>
20#include "spibus_if.h"
21
22static int
23spibus_probe(device_t dev)
24{
25	device_set_desc(dev, "spibus bus");
26	return (BUS_PROBE_GENERIC);
27}
28
29static int
30spibus_attach(device_t dev)
31{
32	struct spibus_softc *sc = SPIBUS_SOFTC(dev);
33
34	sc->dev = dev;
35	bus_enumerate_hinted_children(dev);
36	return (bus_generic_attach(dev));
37}
38
39/*
40 * Since this is not a self-enumerating bus, and since we always add
41 * children in attach, we have to always delete children here.
42 */
43static int
44spibus_detach(device_t dev)
45{
46	int err, ndevs, i;
47	device_t *devlist;
48
49	if ((err = bus_generic_detach(dev)) != 0)
50		return (err);
51	if ((err = device_get_children(dev, &devlist, &ndevs)) != 0)
52		return (err);
53	for (i = 0; i < ndevs; i++)
54		device_delete_child(dev, devlist[i]);
55	free(devlist, M_TEMP);
56
57	return (0);
58}
59
60static int
61spibus_suspend(device_t dev)
62{
63	return (bus_generic_suspend(dev));
64}
65
66static
67int
68spibus_resume(device_t dev)
69{
70	return (bus_generic_resume(dev));
71}
72
73static int
74spibus_print_child(device_t dev, device_t child)
75{
76	struct spibus_ivar *devi = SPIBUS_IVAR(child);
77	int retval = 0;
78
79	retval += bus_print_child_header(dev, child);
80	retval += printf(" at cs %d", devi->cs);
81	retval += bus_print_child_footer(dev, child);
82
83	return (retval);
84}
85
86static void
87spibus_probe_nomatch(device_t bus, device_t child)
88{
89	struct spibus_ivar *devi = SPIBUS_IVAR(child);
90
91	device_printf(bus, "<unknown card>");
92	printf(" at cs %d\n", devi->cs);
93	return;
94}
95
96static int
97spibus_child_location_str(device_t bus, device_t child, char *buf,
98    size_t buflen)
99{
100	struct spibus_ivar *devi = SPIBUS_IVAR(child);
101
102	snprintf(buf, buflen, "cs=%d", devi->cs);
103	return (0);
104}
105
106static int
107spibus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
108    size_t buflen)
109{
110	*buf = '\0';
111	return (0);
112}
113
114static int
115spibus_read_ivar(device_t bus, device_t child, int which, u_int *result)
116{
117	struct spibus_ivar *devi = SPIBUS_IVAR(child);
118
119	switch (which) {
120	default:
121		return (EINVAL);
122	case SPIBUS_IVAR_CS:
123		*(uint32_t *)result = devi->cs;
124		break;
125	}
126	return (0);
127}
128
129static device_t
130spibus_add_child(device_t dev, u_int order, const char *name, int unit)
131{
132	device_t child;
133	struct spibus_ivar *devi;
134
135	child = device_add_child_ordered(dev, order, name, unit);
136	if (child == NULL)
137		return (child);
138	devi = malloc(sizeof(struct spibus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
139	if (devi == NULL) {
140		device_delete_child(dev, child);
141		return (0);
142	}
143	device_set_ivars(child, devi);
144	return (child);
145}
146
147static void
148spibus_hinted_child(device_t bus, const char *dname, int dunit)
149{
150	device_t child;
151	struct spibus_ivar *devi;
152
153	child = BUS_ADD_CHILD(bus, 0, dname, dunit);
154	devi = SPIBUS_IVAR(child);
155	resource_int_value(dname, dunit, "cs", &devi->cs);
156}
157
158static int
159spibus_transfer_impl(device_t dev, device_t child, struct spi_command *cmd)
160{
161	return (SPIBUS_TRANSFER(device_get_parent(dev), child, cmd));
162}
163
164static device_method_t spibus_methods[] = {
165	/* Device interface */
166	DEVMETHOD(device_probe,		spibus_probe),
167	DEVMETHOD(device_attach,	spibus_attach),
168	DEVMETHOD(device_detach,	spibus_detach),
169	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
170	DEVMETHOD(device_suspend,	spibus_suspend),
171	DEVMETHOD(device_resume,	spibus_resume),
172
173	/* Bus interface */
174	DEVMETHOD(bus_add_child,	spibus_add_child),
175	DEVMETHOD(bus_print_child,	spibus_print_child),
176	DEVMETHOD(bus_probe_nomatch,	spibus_probe_nomatch),
177	DEVMETHOD(bus_read_ivar,	spibus_read_ivar),
178	DEVMETHOD(bus_child_pnpinfo_str, spibus_child_pnpinfo_str),
179	DEVMETHOD(bus_child_location_str, spibus_child_location_str),
180	DEVMETHOD(bus_hinted_child,	spibus_hinted_child),
181
182	/* spibus interface */
183	DEVMETHOD(spibus_transfer,	spibus_transfer_impl),
184
185	DEVMETHOD_END
186};
187
188driver_t spibus_driver = {
189	"spibus",
190	spibus_methods,
191	sizeof(struct spibus_softc)
192};
193
194devclass_t	spibus_devclass;
195
196DRIVER_MODULE(spibus, spi, spibus_driver, spibus_devclass, 0, 0);
197MODULE_VERSION(spibus, 1);
198