1 /* $NetBSD: fdt_mmc_pwrseq.c,v 1.2 2018/06/30 20:34:43 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2017 Jared 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: fdt_mmc_pwrseq.c,v 1.2 2018/06/30 20:34:43 jmcneill Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/kmem.h>
35 #include <sys/queue.h>
36
37 #include <libfdt.h>
38 #include <dev/fdt/fdtvar.h>
39
40 struct fdtbus_mmc_pwrseq {
41 device_t mps_dev;
42 int mps_phandle;
43 const struct fdtbus_mmc_pwrseq_func *mps_funcs;
44
45 LIST_ENTRY(fdtbus_mmc_pwrseq) mps_next;
46 };
47
48 static LIST_HEAD(, fdtbus_mmc_pwrseq) fdtbus_mmc_pwrseqs =
49 LIST_HEAD_INITIALIZER(fdtbus_mmc_pwrseqs);
50
51 int
fdtbus_register_mmc_pwrseq(device_t dev,int phandle,const struct fdtbus_mmc_pwrseq_func * funcs)52 fdtbus_register_mmc_pwrseq(device_t dev, int phandle,
53 const struct fdtbus_mmc_pwrseq_func *funcs)
54 {
55 struct fdtbus_mmc_pwrseq *mps;
56
57 mps = kmem_alloc(sizeof(*mps), KM_SLEEP);
58 mps->mps_dev = dev;
59 mps->mps_phandle = phandle;
60 mps->mps_funcs = funcs;
61
62 LIST_INSERT_HEAD(&fdtbus_mmc_pwrseqs, mps, mps_next);
63
64 return 0;
65 }
66
67 static struct fdtbus_mmc_pwrseq *
fdtbus_get_mmc_pwrseq(int phandle)68 fdtbus_get_mmc_pwrseq(int phandle)
69 {
70 struct fdtbus_mmc_pwrseq *mps;
71
72 LIST_FOREACH(mps, &fdtbus_mmc_pwrseqs, mps_next) {
73 if (mps->mps_phandle == phandle)
74 return mps;
75 }
76
77 return NULL;
78 }
79
80 struct fdtbus_mmc_pwrseq *
fdtbus_mmc_pwrseq_get(int phandle)81 fdtbus_mmc_pwrseq_get(int phandle)
82 {
83 const u_int *p;
84 int mps_phandle;
85
86 p = fdtbus_get_prop(phandle, "mmc-pwrseq", NULL);
87 if (p == NULL)
88 return NULL;
89
90 mps_phandle = fdtbus_get_phandle_from_native(be32toh(p[0]));
91 return fdtbus_get_mmc_pwrseq(mps_phandle);
92 }
93
94 void
fdtbus_mmc_pwrseq_pre_power_on(struct fdtbus_mmc_pwrseq * mps)95 fdtbus_mmc_pwrseq_pre_power_on(struct fdtbus_mmc_pwrseq *mps)
96 {
97 if (mps->mps_funcs->pre_power_on)
98 mps->mps_funcs->pre_power_on(mps->mps_dev);
99 }
100
101 void
fdtbus_mmc_pwrseq_post_power_on(struct fdtbus_mmc_pwrseq * mps)102 fdtbus_mmc_pwrseq_post_power_on(struct fdtbus_mmc_pwrseq *mps)
103 {
104 if (mps->mps_funcs->post_power_on)
105 mps->mps_funcs->post_power_on(mps->mps_dev);
106 }
107
108 void
fdtbus_mmc_pwrseq_power_off(struct fdtbus_mmc_pwrseq * mps)109 fdtbus_mmc_pwrseq_power_off(struct fdtbus_mmc_pwrseq *mps)
110 {
111 if (mps->mps_funcs->power_off)
112 mps->mps_funcs->power_off(mps->mps_dev);
113 }
114
115 void
fdtbus_mmc_pwrseq_reset(struct fdtbus_mmc_pwrseq * mps)116 fdtbus_mmc_pwrseq_reset(struct fdtbus_mmc_pwrseq *mps)
117 {
118 if (mps->mps_funcs->reset)
119 mps->mps_funcs->reset(mps->mps_dev);
120 }
121